As a part of this effort, we are going to share the perspective from the expert of ‘Green energy’, Yun jung, Jin who is the senior researcher at POSCO Research Institute (POSRI).

Steel is nearly 100% reusable in consideration of Life Cycle Approach(Source: World Steel)

How do we achieve sustainability?

No one would deny the importance of sustainability. But how do we achieve it?

According to Jin, the answer can be found in the ‘Life Cycle Approach’ model. This model provides a better idea of how sustainability can be achieved. Life Cycle Approach seeks to prevent the root causes that can threaten the environment by identifying and considering all stages of a product’s life cycle, beginning with the extraction of raw materials.

Take vehicle emission as an example, it is widely known that electric vehicles produce far less pollution than gasoline vehicles. However, a closer look at vehicle operation would reveal that electric vehicles also produce a fair amount of pollution by burning carbon when generating electricity.

Majority of Steel product we discard is easily recycled(Source: GenesisSteel)

Can Steel be life-cycled?

So how does steel fit into the Life Cycle Approach?

Jin showed little bit more on details of the reasons why steel should be considered as an important eco-friendly as product or a material. Beginning with the manufacturing stage, the by-products of steel production, such as slag, can be recycled to make raw materials for road construction. Once in use, its longevity is a great advantage in terms of sustainability efforts. Steel used in buildings and various infrastructures boast a life span of almost 100 years. Steel used in vehicles and various machines also can last over 10 years.

SEE ALSO: Recycled Steel Changing the Way the World Uses Metal

Lifespan of steel is way longer than we anticipate(Source:World Steel)

After it has served its purpose, steel is still highly recyclable and boasts a recycling rate of nearly 90%. Because it can be infinitely recycled while maintaining its inherent property and quality intact, steel is considered the most suitable material for circulation economy.

POSCO’s Clean advanced technology may be the solution for green society

Steel is essential for our sustainable future

Jin mentioned that the POSRI reports clearly illustrates that various ways of steel can be applied to the Life Cycle Approach and its viability as an integral element for sustainability. POSCO strives to stay ahead of the curve by utilizing its cutting-edge technology to develop innovative products and solutions, such as the GIGA STEEL and FINEX® smelting processes.

Finally, Jin assured that with the Life Cycle Approach in mind, POSCO takes pride in all the efforts in reducing greenhouse emissions and in paving the way towards a sustainable society.

SEE ALSO: How Steel Makes the Circular Economy Go ‘Round’

More and more automakers are adding EVs to their fleet. (Source: Engineering and Technology)

While all this sounds promising for the environment, EVs don’t automatically translate into lower GHG emissions. According to World Auto Steel (WAS), the emissions from vehicle production will be greater than the amount of emissions from driving. As such, it is becoming increasingly important for manufacturers, policymakers and consumers alike to view material options by considering its life cycle assessment (LCA).

World Auto Steel Case Study

WAS conducted a case study in which they compared two popular lightweight materials for EVS; aluminum and Advanced High-Strength Steel (AHSS). The study followed the University of California Santa Barbara Automotive Energy & GHG Model (UCSB Model) for a comprehensive analysis of each material’s total energy use throughout its entire life cycle, from production to end of life recycling. For the study, WAS examined 1,000,000 BEVs of equal range that were made up of either entirely aluminum or AHSS.

BEVs made of AHSS require over 15 percent less energy than aluminum cars. (Source: World Auto Steel)

The study found that automakers can make over 17 percent more BEVs made of AHSS than aluminum BEVs with the same amount of energy. In other words, with the energy it takes to make 1 million aluminum BEVs, automakers can make 1.17 million AHSS BEVs.

Why is AHSS More Energy Efficient?

Aluminum production requires 8 times more energy per kilogram than steel production because the production process of aluminum is much more complicated and involves more steps than steel production. The aluminum BEVs in the study used up 30 percent more energy than those made from AHSS throughout its entire life cycle. Plus steel is 100 percent recyclable and can be reused almost indefinitely.

There are many sources of emissions output involved in the entire life cycle of a vehicle. (Source: World Auto Steel)

This poses a serious need to reexamine existing policies and regulations that only seek to reduce tailpipe emissions. By also taking into account emissions from the production of materials all the way to how a car is disposed at the end of its life cycle, automakers can grasp a better picture of the real impact of their choices on the environment.

A Sustainable Choice

As a solution-providing partner for automakers, steelmaker POSCO designed the perfect AHSS for cars that is lightweight, extremely strong, highly formable and environmentally friendly. POSCO GIGA STEEL belongs to the highest category for tensile strength of greater than 1GPa (Gigapascal). It can withstand more than 100 kg of force per square millimeter, making it 3 times stronger than aluminum. It is also 3.5 times cheaper than aluminum and 2.1 times cheaper to manufacture.

SEE ALSO: Infographic: Driving the Future with POSCO GIGA STEEL

POSCO GIGA STEEL is three times stronger than aluminum.

In 2016, POSCO sold 9 million tons of steel sheets for cars, making up 10 percent of the entire global automotive market for steel sheets. POSCO GIGA STEEL was designed to further improve the performance and efficiency of POSCO’s auto partners around the world. As the auto industry heads towards a future where environmentally-friendly EVs become the norm, POSCO will strive to equip its auto partners with the materials and tools necessary to stay ahead and competitive.

Stephen Zoepf is the executive director at the Center for Automotive Research at Stanford University.

To kick off the forum, Stephen Zoepf, executive director at the Center for Automotive Research at Stanford University gave a presentation called “Electric Vehicles: Adapting to a Changing Marketplace” to share his insights on what future markets will look like and implications for automakers, suppliers as well as consumers.  

Here are the key takeaways.

The Future is Going to Look Very Different

According to a report by RethinkX, an independent research group, 6 trillion U.S. passenger miles will be driven in 2030, up 50 percent from 2021. Of those miles, 95 percent will be driven in self-driving, electric and shared vehicles and only 5 percent of those miles will be driven by internal combustion engine (ICE) vehicles.

The report goes on to say that autonomous EVs (A-EV) will make up 60 percent of the U.S vehicle stock, and those vehicles will be part of a shared-mobility service. As more people start to share cars, the overall number of vehicles on U.S. roads will drop from 247 million in 2020 to 44 million in 2030.

SEE ALSO: Going Autonomous: The Transformation of the Transportation Industry

The change is already happening. In 2016, shared-mobility companies such as Uber and Lyft drove 500,000 passengers per day in New York City, which is triple the number of passengers from 2015. Today, more and more automakers like Tesla and GM are also entering the shared-mobility market.

EVs are already becoming prominent in major cities around the world. (Source: Time)

The findings illustrate a future where people drive more miles with fewer cars, which are fueled by electricity, and shared instead of owned. It’s a radical visualization of the future, but one that is driven by economic forces.

By 2021, shared vehicles will be 4 to 10 times cheaper per mile than private vehicles, and American households will save an average of USD 5600 every year by switching to shared EVs from cars fueled by gas, according to RethinkX.

Zoepf shared another report by ARK investment Management which echoes the finding above- in the next ten years, people will drive three times more kilometers using half the number of cars and the number of EVs on the road will increase 10 fold.

What It Means for Car Manufacturers and Suppliers

A shrinking vehicle fleet consisting of mostly EVs can only mean one thing: a major disruption to the current automotive market.  

Right now, the average lifecycle of a car in the U.S. is 11 years. However, the majority of a car’s total mileage is driven in its early years. It’s the same for shared vehicles, but they are driven about 80,000- 90,000 km per year, 10 times the distance of privately-owned cars. What this shows is a compression of the vehicle lifespan in its first 3 to 4 years.

These statistics pose critical concerns for automakers.

Will overall vehicle sales decrease in the coming future? According to Zoepf, that’s the wrong question to ask. Instead, automakers should be asking “will I make money?” Automakers have a couple of choices. They can either adapt early on and manufacture EVs and/or A-EVs at a competitive price, or become a shared-mobility provider. Early movers such as Tesla, GM and Volvo are already shifting their business strategies to fit these models.

GM recently launched Maven, a car-sharing service. (Source: The Verge)

Another question to ask is how these trends will affect vehicle design. With shortened vehicle life-cycles, manufacturers can either design cars to last only 3 to 4 years for quick replacements, or opt for the aviation model where the vehicle will be built to last, but the interior parts, such as seats, will be replaced frequently. Whatever route manufactures choose to take, gaining a competitive edge in vehicle and service quality early on will be key.

What Will This Mean for Vehicle Material Suppliers?

If building cars to last is no longer a primary priority, will car makers downgrade their materials? The short answer is not a chance.

Through a customer survey study Zoepf conducted of 60,000 Zipcar customers, he showed that the number one factor when choosing a car is safety. However, there is no one, ideal model or type of car that is preferred in a shared mobility framework. The purpose of the trip determines the type of vehicle, and the success of a shared mobility service provider will depend on the variety of cars it can provide – all with competitive safety ratings.

POSCO ICT already has ChargEV stations set up across Korea. (Source: POSCO ICT)

The supplier’s role will be to continue providing high-quality materials that can boost the safety and cost competitiveness of future vehicles. Steel suppliers have to keep developing lightweight and high-strength steels like POSCO GIGA STEEL, and research new materials that can boost the competitiveness of EVs such as POSCO’s Hyper NO for motor cores, battery materials and POSCO ICT’s EV charging service and infrastructure.

There remain numerous challenges that lie ahead for a greener and safer future with EVs and A-EVs, and it might take longer than experts predict for lawmakers, corporations and consumers to all agree on an optimal mobility model. However, change is already underway and automakers and suppliers alike need to strategize and adapt early on to take advantage of the upcoming opportunities.

For more information on how advanced automotive steel can benefit automakers looking for lightweight and sustainable steel solutions, take a look at our infographic on POSCO GIGA STEEL or read the full report here. 

Cover photo courtesy of GOV.UK.

Electrical Steel is used to make electric motors for EVs. (Source: Wonderful Engineering)

According to Markets and Markets, the market for electrical steel is projected to expand from USD 27.84 billion in 2016 to USD 38.98 billion by 2021, at a compound annual growth rate (CAGR) of 7 percent. Electrical steels go through various demanding production processes such as annealing, hot and cold rolling and insulation coating. Having the most advanced production technology is paramount, and choosing the best quality electrical steel will determine the overall performance and efficiency of EVs.

What is Electrical Steel?

Electrical steel, also known as silicon steel, is a steel alloy of iron and silicon used to make the cores of motors, transformers and generators.  This softer type of steel can generate various magnetic properties, has high permeability and low amounts of core loss. It has a small hysteresis curve, meaning reduced magnetic hysteresis as well as iron losses, or energy loss.

There are two kinds of structures for electrical steel; grain-oriented and non-oriented.

Grain-oriented electrical steel sheets are most commonly applied to transformers. (Source: Nikomag)

Grain-oriented electrical steel has a uniform, consistent direction of grains in its structure which allows for greater flux density and magnetic saturation. Most commonly, grain-oriented electrical steel is used for transformers which have a predictable and specific magnetic field direction.

Non-oriented electrical steel plates are traditionally welded together to form electrical motors. (Source: LHD Motor)

A major factor that determines the quality of electrical steel is minimal core loss. Due to the constant change in direction of the magnetic field, the energy that is created can easily be lost in the form of heat. Core loss reduction has to be achieved through high-quality electrical steels that have high flux density and lower levels of core losses.

POSCO’s Hyper NO

POSCO is one of a growing number of companies dedicated to doing its part in creating an environmentally sustainable future. That’s why POSCO has been developing its premium non-oriented electrical steel to provide partners with material solutions for EVs.

Take a look at the video below to see how Hyper NO can increase the performance and efficiency of electric vehicles.

POSCO’s Hyper NO is processed using innovative methods such as the self-bonding technology which replaces traditional welding procedures to improve the core’s bonding force. POSCO also managed to reduce core loss by 5 percent compared to traditional types of non-oriented electrical steel and reduce the motor noise by 5dB with its rolling technology that can process the Hyper NO down to an ultra-thin form of 0/15mm. These technologies, along with the Hyper NO’s high magnetic flux density will increase the efficiency of the motor and improve the overall performance vehicles to which it is applied. Hyper NO is highly sought after by automakers looking for premium-grade electrical steel to apply to their EV motors.    

In February 2017, POSCO expanded its production facilities at Pohang Steel Works to increase its annual production capacity of electrical steel from 80,000 tons to 160,000 tons, enough to produce 2.6 million motors for EVs. The strategic move is in line with POSCO’s commitment towards expanding environmentally-friendly businesses as well as its solution marketing efforts to provide customized material solutions to its partners.

Although wire rods are not always in the spotlight, they are widely used in many parts of a car. Steel wire rods are processed into parts for the steering and suspension systems, tire cords and bearings.

However, not all wire rods are the same, and improvements in production technologies can increase automotive performance, safety and cost-effectiveness. POSCO’s world premium steel wire rods provide such solutions to its automotive partners as the global demand for automotive wire rods continues to grow.

Take a look at the video below to see why more and more automakers are choosing POSCO’s wire rods, and where they can be applied.

Wire Rods in the Steering System

The steering system is what allows the wheels of a heavy vehicle to move in various directions and angles, with little force exerted by the driver. If the driver were to steer the road wheel directly, he/she would have to apply 16 times more effort. Fortunately, the movement of the steering wheel passes through the steering system of pivoted joints to the road wheels, which minimizes the burden of labor on the driver. The most common type of steering system is the rack and pinion, pictured below.

Wire rods make up the steering system of a car. (Source: Tires and Parts)

Traditionally, wire rods used for the pinion shaft, rack bar, ball housing, tie rod and tie rod end of the steering system have to be heat treated twice during production. POSCO developed a way to take out all the heat treatment from the production process, allowing manufacturers to cut costs significantly and reduce unwanted emissions.  

Wire Rods for Springs

Automotive springs are part of the suspension system of a vehicle, which determines the level of control the driver will have, as well as the level of comfort. The spring coils compress and elongate along with the movement of the wheels to absorb shock and keep the car body level.

Coil springs are part of the suspension system of a car. (Source: Pakwheels)

As such, the wire rods that make up the suspension system have to have high tensile strength and fatigue resistance. POSCO’s wire rods for automotive springs are made of ultra-clean alloying steel and have a 2.3 GPa tensile strength versus the average 1.9 GPa of traditional wire rods. When applied to the engine valve springs and coil springs for suspensions and stabilizer bars, it enhances the overall performance, safety and lightweight features of the vehicle.       

Wire Rods for Tire Cords

Wire cords undergo an extensive drawing process to be processed into tire cords, also known as tire belts. Tire cords are important because they act as the chassis of the tire, giving it strength and resistance against punctures. It also allows the tire to stay flat for maximum contact with the road.

POSCO’s wire rods during the production process. (Source: World Steel Association)

The quality of tire cords lies in its strength, elongation and stiffness, and require especially clean and high-strength steel to produce. POSCO’s wire rods for tire cords are also highly workable for producing extra-fine wire, meaning car manufacturers get the added benefit of lightweight along with enhanced safety and performance.

Wire Rods for Wheel Bearings

Wheel bearings are under a lot of pressure, literally. It bears the weight of the vehicle so that the wheels can turn as smoothly as possible with little friction. If a car’s wheel bearings don’t function properly or wear out, the tires can rub against the axle, the rubber can burn due to friction, the wheels can malfunction and cause screeching sounds. It is important for the bearings to be highly wear and fatigue resistant to minimize work hardening, crack and deformation. POSCO’s innovative production technology includes numerous tests and quality checks to ensure that wire rods for bearings are in perfect condition.

Wheel bearings bear the weight of the vehicle so tires don’t have to. (Source: MOOG Suspension Parts)

Recently, Research and Markets predicted a compound annual growth rate (CAGR) of 3.50 percent for the global stainless steel wire rod market from 2017 to 2021. This is a telling sign that automakers will continue to seek high-quality wire rods in the midst of growing investment in electric and autonomous vehicles. Now with its second overseas facility up and running, POSCO will continue to meet the global demand for world premium automotive materials and provide innovative solutions to its partners.  

Cover photo courtesy of Steel Intelligence.

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Contrary to popular belief, mass reduction does not automatically equal fuel savings, especially when it comes to urban driving. There are other factors that determine the fuel efficiency of a vehicle such as driving cycle, vehicle size and its powertrain. Until recently, there was a  lack of variety in engine types and powertrains, so even though automakers reduced the weight of car frames, they could not apply a complementary engine or powertrain to the lighter parts.

So, have automakers been lightweighting for nothing?

Of course not, in the past decade alone, engines and powertrains have also become extremely efficient through advancements in start-stop-systems and downsizing, and newer options including hybrids, electric batteries and range extenders that now allow automakers to capitalize on their lightweight materials.

Although there are several lightweight materials, below are 5 reasons why AHSS continues to be the lightweight material of choice for automakers:

1. Decision Makers Care About the Environment

Well, not everyone, but many countries around the world have started the process to phase out gasoline and diesel-fueled cars, including India and China, the two largest automotive markets in the world. Governments are taking serious action against climate change and it will reflect in their policies. Automakers are choosing to lightweight their vehicles for lower emission rates with AHSS, because not only is AHSS lightweight, there are no trade-offs with other vital features such as safety and cost-effectiveness.

2. Everyone’s Going Electric

Globally, automakers are investing in electric vehicles (EVs) in line with national and international environmental policies. However, EVs still have a ways to go before they become the norm. EVs will face the same safety requirements as regular cars, but with the added responsibility of protecting the battery and its flammable components during a crash.

In 2016 there were several car accidents involving the Tesla Model S, where leaked battery fluids caused fires. Automakers need to find a solution to make EVs as safe, and eventually, safer than traditional cars. As an innovative automotive material, AHSS was built for safety.

3. Safety is Always First

Safety is and should always be the number one priority for automakers, material providers and policymakers alike. Even with all the hype about autonomous driving and sensors, there is very little chance that policymakers will reverse the stringent safety regulations in place today. People want to feel safe, no matter what type of car they are getting into.  

2016 Smart Fortwo and the Mercedes S Class take part in a crash test (Source: Green Car Reports)

One possible material solution is Complex Phase (CP) steel, a type of POSCO GIGA STEEL for the vehicle’s side panels, bumper rails and door impact bars- the parts that determine the safety ratings of the vehicle. It has superior strength and shock-absorbing qualities, without the added weight of traditional high-strength materials, and that’s why carmakers such as GM Korea, Ssangyong Motors and Renault Samsung Motors all use POSCO GIGA STEEL.

4. Cost is Always Second

This goes for automakers as well as drivers on the consuming end. Drivers want lower costs without compromising safety and performance ratings, and desire fuel efficiency- a major reason why automakers are lightweighting.

Some automakers choose alternative materials such as aluminum and carbon fiber to meet lightweight requirements to find that not only are the materials more costly over steel, factories need an equipment overhaul to work with them. Moreover, there are additional costs related to training employees to work with new materials, whereas all auto manufacturers are familiar with welding and forming steel.  

Take a look at this infographic and see how AHSS stacks up against other lightweight materials in terms of cost and performance.  

5. It’s Not Over Till It’s Over

No two lightweight materials are the same when observed under the life-cycle approach, a comprehensive life cycle assessment of a material’s automotive carbon emissions from production to disposal. Often times, the process of manufacturing lightweight materials and improved powertrains result in more carbon emissions than they are saving.

The life cycle assessment can be used to determine the carbon output of a vehicle. (Source: World Auto Steel)

At the end of the day, steel has the lowest production-related emissions and can be recycled at the end of its lifecycle. Steel remains the most recycled material because it can be reapplied in different forms almost infinitely.

Automakers are increasingly incorporating lightweight materials to their new models. Although competition for the greatest market share of lightweight materials is fierce, AHSS is by far the leading material when it comes to lightweight solutions. According to McKinsey & Company’s Lightweight, Heavy Impact report, the percentage of high-strength materials used for cars will increase to 38 percent by 2030, compared to 15 percent in 2010. Steel continues to evolve according to the changing demands of the auto market, and for now, there is no other multi-solution material that can compete.

Cover photo courtesy of Hyundai.

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Why Should People Care About Autonomous Transportation?

Autonomous transportation is emerging across the world, from personal vehicles to Tesla’s proposed semi trucks that drive in convoy with a lead vehicle handling autonomous follow trucks. Intel is also planning to test a fleet of one hundred autonomous cars and Hyundai’s planning to showcase its self-driving technology at the biggest winter sports event of 2018.

While many have heard of self-driving cars and other road-based vehicles, it may come as a surprise to learn just how far technology has advanced in autonomous transportation. The Swiss bank UBS, suggests that autonomous airplanes could be in place by 2025, a feat that would save airlines $35 billion a year. Clearly, the benefits are drastic and it is becoming essential for companies to invest in making autonomous travel work.

Even further into the future, companies like Next Future Transportation are envisioning pod travel, through which individual vehicles will autonomously transport people from point A to point B.

Next Future Transportation’s autonomous pod (Source: Next Future Transportation)

No matter the type, the economic impact of autonomous transportation technology is unavoidable. Boston Consulting Group expects that the driverless car market will be worth $42 billion by 2025 and $77 billion by 2035, and IHS suggests driverless car ubiquity will hit around 2050.

In terms of what these automated vehicles offer to the public, the Eno Centre for Transportation reports that if 90 percent of American roads were autonomous, accidents would drop from 6 million a year to 1.3 million; deaths would fall from 33,000 to 11,300. Add in better traffic conditions, higher fuel efficiency and extra time gained from not driving, and it’s easy to see why companies are taking notice of this tech sector.

Who is Investing in Autonomous Transportation?
Autonomous transportation entails investment from various industries from materials to technology, and major players are making early moves. Tesla is a good example of a specialty vehicle company determined to see autonomous transportation become a worldwide reality.

Big names in traditional transportation are also jumping aboard. General Motors purchased Cruise Automation, and Ford has invested in an AI startup, Argo AI. Audi has created a subsidiary, the SDS Company, focused on self-driving technology, and BMW has formed an alliance with Intel and Mobileye.

There are also auto suppliers getting into this market, such as Magna, a supplier that is manufacturing vehicles as well as providing the parts to help more traditional companies jump into automated vehicles.

Tech giants like Microsoft are getting involved, too, collaborating with automakers to include their own technology in self-driving vehicles, as well as to research and develop automated transportation technology.

Whether companies are involved in creating the actual vehicles that will be automated, providing security and safety features, pursuing further research, or providing the materials needed to create these vehicles of the future, it is safe to say that this industry is growing rapidly.

Autonomous Transportation and the Steel Industry
A shift toward autonomous transportation is good news for the steel industry. At first glance, it seems steel consumption will decrease as fewer car accidents will lead to less demand for repair parts and more room to use other materials for aesthetic purposes. However, demand for high-strength, premium steels that are highly sought after in traditional cars will continue to increase.

Materials like POSCO GIGA STEEL provide greater strength and safety for automated vehicles, an important consideration when one considers a road full of cars driving themselves. While people may no longer be behind the wheel, they will want to know that their cars, and the cars around them, are made to the highest safety standards. Safety regulations for traditional cars are only getting tougher, and that won’t change with autonomous vehicles.

POSCO’s PBC-EV made with POSCO GIGA STEEL

High-strength steel allows car makers to lightweight their vehicles without compromising safety. POSCO GIGA STEEL’s lightweight properties make it a sustainable solution for automated vehicles that aim to leave a minimal carbon footprint and maximize fuel efficiency. Even better, it is affordable; an important factor considering the overall cost of the technology and hardware that goes into automated vehicles.

The steel industry will also see a boost in the need for accompanying facilities for automated transportation, including manufacturing plants, parking structures, charging stations, smart roads and so on. While automated transportation may be high tech, there will be plenty of opportunities for those in the steel industry to provide material solutions to a rapidly growing market.

Cover photo courtesy of Auto Evolution.

The increasing demand for automotive fuel efficiency and mass reduction has resulted in increased use of alternative materials in the design of various components that have historically been produced using steel. Mass benchmarking often is done with a one-at-a-time approach. A reference vehicle is selected, the vehicle is disassembled, parts weighed and analyzed, and then the data used to set mass targets for a vehicle under design. A potential problem with this method is that it does not tell you anything about the mass efficiency of the baseline part. However, benchmarking study results, commissioned by WorldAutoSteel by A2Mac and Dr. Don Malen of the University of Michigan, point to a powerful new statistics-based benchmarking methodology.

Rather than considering a single vehicle or a small set of vehicles, this study, based on statistical benchmarking methodology presented by Dr. Malen in a Society of Automotive Engineers paper, looks at a very large sample of vehicles over a range of sizes and segments. From this larger population, real vehicles were tested via statistical methods. This methodology isolates the lightweighting “achievers” among subsystems, such as body structures, doors, hoods, deck lids, bumpers, etc. It allows automotive designers to identify those subsystems which are much lighter than the ‘average’ vehicle, and therefore set subsystem targets on a more accurate basis than that which is being accomplished in the industry today. These lighter than average subsystems are called mass “efficient.”

It also allows a broad look at current production vehicles to take the pulse of lightweighting efforts.  Has steel truly achieved all it can in lightweighting, that is, have vehicles become as light as they can be with steel? What is the reality of the steel/aluminum comparison? This 2017 report is the third update of this study in benchmarking, and the findings continue to surprise. These findings can be summarized in the following statements and examples:

The mass efficiency of today’s steel designs varies drastically (Figure 1). When comparing some steel components of the same size and function, there are drastic differences in the range of weights in what should be similar mass subsystems. In fact, some steel designs of the same size, performance, and similar vehicle segment are double the weight of others. As an example, among the same size steel doors, there is a 44% difference between the heaviest steel door in the database and the steel door considered most efficient. This confirms that there is still much room for design optimization in vehicle structures, with steel, even with the technology and materials already in use.

Figure 1. Mass efficiency of today’s steel designs

When compared to an efficient steel design, the mass savings gap with aluminum significantly reduces. Statistical evaluation conducted in the study identified those components that are most mass efficient. When the most efficient steel designs are compared to the most efficient aluminum designs in the study sample, the mass savings gap between steel and aluminum significantly reduces, compared to averages (“nominal”) of all steel and aluminum designs. In Figure 2, for every component that falls within the orange triangle, the mass savings among efficient designs was less than the mass savings between the averages. 

Figure 2. Mass savings gap with aluminum vs. efficient steel structures

Figure 3 provides a slightly different comparison as a component example. It compares the average steel bumper and the efficient steel bumper to the efficient aluminum bumper, showing a significantly less mass reduction for aluminum. The efficient steel bumper saves 27% mass over the average steel bumper, providing an affordable alternative.

Figure 3. Comparison between the average steel bumper, the efficient steel bumper, and the efficient aluminum bumper

Mass savings achieved at the component structure level are often not realized at the system level.  In nearly every component reviewed, a portion of the mass savings that was achieved with an aluminum structure was lost in the system. Figure 4 shows all systems (orange-shaded area) which do not reflect the mass savings achieved at the component structure level. The aluminum hatchback system actually exceeded the mass of the steel design, which is why its data point is in the negative number (lower tan area) of the chart. These systems are particularly those components that directly communicate with the passenger compartment since they require additional noise, harshness, and vibration (NVH) mitigation. A follow-up door study to investigate this phenomenon revealed that the biggest mass additives to the aluminum door subsystems was additional NVH sound damping materials and added structure such as hinge reinforcements.

Figure 4: Mass Savings with Aluminum – Structure vs. System

There is yet untapped mass savings potential for steel. The disparity among the steel subsystems still notable in the database in this study update confirms that there is still considerable room for vehicle lightweighting with steel. Design optimization, such as that used in the steel industry program FutureSteelVehicle body structures, combined with growing usage of Advanced High-Strength Steels and steel technologies, will lead to a leaner, yet cost-effective, vehicle fleet.   

Key reasons to utilize AHSS are (1) better performance in crash energy management, and (2) superior strength allowing this performance to be achieved with thinner materials, translating into lower vehicle weight. It is important to note that the auto industry has adopted lightweighting as a greenhouse gas reduction strategy; this strategy, however, must be executed in an affordable manner. Thus, today’s steels enable significant mass reduction, while meeting crash and other functional requirements, while preserving affordability.  

Relentless innovation & research has ensured steel’s status as the automotive material of choice.  In 1970 there were just seven High-Strength Steel grades available to automakers. Today there are over 45. As a result, the steel industry is seeing unprecedented growth in AHSS automotive applications. Independent marketing research suggests that they are the fastest growing materials for future automotive applications as shown in Figure 5, which provides only the North American data.

Figure 5. North American Light Vehicle AHSS & UHSS Utilization Forecast

Today, most steel companies are extending their research and development efforts to expand the range of properties available through these new steels and enable safe and environmentally friendly vehicles.

For more information on how advanced automotive steel can benefit automakers looking for lightweight and sustainable steel solutions, take a look at our infographic on POSCO GIGA STEEL or read the full report here. 

Compared to the world’s very first cars, today’s cars are faster, stronger, safer and have more sophisticated designs. As alternative materials like aluminum are increasingly being used for car parts that were originally made of steel, some even refer to this trend as a “material war.”

“Material War” in the Auto Industry

Recently, various substitutes for steel have entered the picture and are being applied in commercial vehicles. The most commonly used materials are aluminum and CFRP (Carbon Fiber Reinforced Plastic).

Beginning in the 1930’s, aluminum was primarily used as a lightweighting material for race cars and the outer panel of a vehicle. On the day of the Eifel race, the Mercedes-Benz weighed over the maximum limit and in an attempt to resolve this, the white paint was stripped from the frame, leaving the car’s aluminum frame completely exposed. This is how the Benz got its famous nickname, the “Silver Arrows.”

Pictured is the Mercedes Benz “Silver Arrows” racecar with its paint completely stripped off to reduce the weight. (Source: Daimler AG)

Safety regulations were less strict then than they are today. If there was an accident, the outcome would most likely be a severe injury or even death. With the goal of increased protection, researchers began to use tubular frames made of chromium molybdenum steel in order to reinforce the rigidity of the vehicle.

As the 1970’s rolled around, CFRP, a material that was already being applied in the aerospace industry, made an appearance in Formula 1 and automotive researchers quickly began discovering its potential and value. Soon enough, CFRP was considered an ideal material for race cars.

The Audi A2 and A8 made with aluminum car frames during the early 2000’s (Source: Audi AG)

The rapid implementation of new substitute materials in the motorsports industry set a precedent for the auto industry as well. In the early 2000s, Audi shocked the industry by presenting the A2 and A8, two vehicles with car frames that were made completely out of aluminum. In 2015, BMW created a large-sized sedan made of CFRP, which was only used in a limited number of cars. This stunned consumers and the industry yet again. As advances were made with aluminum and CFRP, it seemed that steel would inevitably lose its place in the automotive material industry.

However, those who believed that the age of steel was over forgot one thing: steel is constantly evolving. While it is true that aluminum and CFRP could replace steel and that they are lighter, the disadvantages that come with these materials confirm that steel is a much more efficient material.

Aluminum

Aluminum, for example, is lighter than steel, but because it has less strength, thicker pieces need to be used. In order to achieve the same level of strength as steel, it needs to be mixed with other materials. Also, aluminum has a low melting point and easily leads to the formation of the oxide film, a factor that makes it difficult to weld. The high thermal conductivity makes the heat that is produced at the time of welding spread, making the material more brittle.

These disadvantages mean aluminum has to be welded in other ways such as riveting, a method of mechanical joining using thick mushroom-shaped nails or adhesive. If the aluminum is not tightly joined during the riveting process, oxide films form in between the cracks resulting in fatigue failure. If a tackifier was used in the process, an impact or collision could easily rupture the adhesive lining. Addressing these problems, while also ensuring that the frame is durable and light, has proved to be a much more expensive process than manufacturing a traditional steel car frame.

As such, numerous factors including durability, safety, and efficiency must be considered when choosing a material to be applied to a car.

From the 1930s to the ‘70s, it was possible to use aluminum in race cars because the vehicles were only used for one or two races. The aluminum pieces were hammered into shape by hand or joined together by rivets, but mass production of aluminum car frames was a very difficult operation. To this day, aluminum is still a difficult material to work with due to its high cost and the complicated technology involved in the production process.

CFRP

CFRP, which is known to be lighter and stronger than steel, also has several issues. Although a method for mass production has recently been established, it requires a much longer production time (the time allowed for one product to be produced) for a car body or shell, meaning that it also yields higher labor costs.

The McLaren MP4/1 was the first car frame to be made from CFRP.

Recently, Boeing and BMW began to research ways to recycle CFRP, but unlike steel or aluminum, it is fundamentally impossible to melt CFRP and give it a “new life”. Another reason why it is not an eco-friendly material is that various chemical products are used in the manufacturing process.

Also, 80% of carbon fiber production, one of the core materials in CFRP, is used by the aviation industry. Because the demand is much higher than the supply, it is much more expensive than steel and has yet to fully make its way into the automotive industry.

Because these shortcomings have not been addressed, researchers have started to turn their eyes back to steel. Even Audi, which once considered its aluminum car frames a major strength, has adopted steel to create the car frame for their newest sedan. Other major automakers still continue to look to steel as the main material as well.

The Shift Back to Steel

The reason for the shift back to steel is because it not only addresses certain disadvantages of alternative materials but also because it is a more affordable choice. The launch of POSCO GIGA STEEL and PosM, in particular, introduced a whole new level of steel.

Audi has turned away from a fully aluminum car frame and has begun incorporating high-tensile steel plates, as indicated by the purple portions of the car frame.

[clickToTweet tweet=”PosM is POSCO’s unique brand of steel that goes beyond the limits of traditional steel plates and exhibits a new level of performance.” quote=”PosM is POSCO’s unique brand of steel that goes beyond the limits of traditional steel plates and exhibits a new level of performance.” theme=”style6″]

PosM includes three different series of steel. The “E Series” focuses on elongation, the “Y Series” focuses on the yield strength and the “B Series” balances the benefits of the two.

The highlighted parts represent the parts that have been applied to the “E Series” of PosM

PosM “E Series”

The “E Series” was once thought to be only theoretically possible and has long been known as a dream material amongst the world’s leading steel companies. This is because it can meet two demanding conditions at once: strength and formability.

Not only does it have 2-9 times more processability compared to existing materials, it also has an excellent ability to absorb impact, which can make a car safer when used in those engine room parts that absorb and disperse impact.

Many steel companies attempted to produce this material but were not able to complete it due to difficulties in production. However, in 2008, POSCO successfully developed this material for the first time and made it available for purchase.

The highlighted parts represent the parts that have applied the “Y Series” of PosM.

PosM “Y Series”

The “Y series” is used for the parts of a car that protect the passengers, especially because of the yield strength, which represents the strength of a material until it becomes deformed, is quite high. This includes, for example, filler parts that prevent the passenger compartment from becoming damaged in the event of a collision.

PosM “B Series”

The “B series” has both the benefits of the “E series” and “Y series”. It is one of the best materials that can be formed by cold forming, which is a simpler process than what is used to make Hot Press Forming (HPF) steel. Because it is easy to process, it can be manufactured into complex shapes and yield a much lower processing cost.

Until now, there has never been a steel that could exhibit both high strength and durability like PosM has. PosM, first developed by POSCO in 2016, is an indispensable material for automobiles.

Through PosM, which exhibits next-level performance compared to existing advanced high-strength steel solutions, steel is once again being considered as an essential material in automobiles. Also, POSCO GIGA STEEL is rapidly advancing to meet the needs of today’s evolving industry, leading the advanced strength steel market.

POSCO GIGA STEEL, with outstanding processability, affordability and a tensile strength that is over three times that of aluminum with the same thickness, will continue to be a very important material in electric vehicles (EVs) which define the present and future of the automotive industry. It will help overcome the limits of batteries used in EVs and allow the vehicle to travel longer distances with its lightweight qualities and make the car body safer by satisfying the most stringent of safety standards.

In addition, the advantage of being more economical, cleaner and easier to recycle than other materials is necessary for an age where consumers value eco-friendly solutions. As long as cars exist, steel will always be one of the most important materials. Various manufacturers are already turning their attention to hybrid car frames that utilize a combination of aluminum, magnesium and carbon composites, with steel as the main focus.  As advanced high-strength steel continues to make improvements it has the potential to replace the need for these other materials altogether.

Automobile development continues to move forward with steel, and at the crux of this progress is POSCO GIGA STEEL.

Read part one on how POSCO GIGA STEEL goes beyond the limits of traditional lightweight materials and part two on how POSCO GIGA STEEL opens the door to the future of the auto industry.

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Below, The Steel Wire speaks with Choi Jaeyong, Manager at POSCO’s Environment & Energy Business Department and currently a research fellow at the World Steel Association, to discuss sustainable manufacturing trends in the steel industry as well as the evolving automotive steel industry.

What are some of the most exciting initiatives taking place in the steel industry to combat greenhouse emissions and to create more sustainable production methods?

First, we must realize that one of the main causes of greenhouse emissions comes from using fossil fuels for the reduction of iron ore. Therefore, any ideas to improve this process and reduce the use of fossil fuels will also help reduce greenhouse gases. One of the most exciting initiatives taking place in the steel industry is replacing coke with hydrogen on a partial basis as a reduction agent. However, this is only effective if the hydrogen is produced by non-carbon energy sources.

[clickToTweet tweet=”“The sustainable life cycle of steel helps automakers recycle old automobiles into brand-new cars.” ” quote=”“The sustainable life cycle of steel helps automakers recycle old automobiles into brand-new cars.” ” theme=”style6″]

In addition to finding fuel alternatives for blast furnaces, advancements in smart factory technologies, such as AI and IoT, are also helping create more sustainable production methods while significantly enhancing the decision making process. For instance, the digitalisation of the control systems to reduce variations in process parameters has helped reduce energy usage as well as unexpected defects. Moreover, IoT can help employees at worksites by preventing industrial accidents with regards to machinery and equipment.

What do you think steelmakers should do to become more energy efficient?

First of all, steelmakers should work to achieve best-in-class operational standards across all processes. This includes improvements in engineering, operations, reliability, yield, health, and safety. Second, employees should stay up-to-date on the latest developments in steel production to ensure that advancements are shared utilized across the entire industry. Third, we must use collaborative and innovative R&D techniques to make improvements throughout all processes. POSCO is already practicing the first two very well while the third continues to be a priority for POSCO CEO Ohjoon Kwon.

I believe there is no one single solution for energy management; however, if those of us in the steel industry remain enthusiastic about finding creative energy saving solutions, new ideas will continue to arise and evolve.

From your experience working with POSCO’s energy management systems, can you tell us what POSCO is doing to become more energy efficient?

Pohang Steelworks is one of the most intricate modern steel manufacturing sites in the world. We continuously look for improvements throughout all processes including in the combustion, gas, corrosion, mechanical, instrument & measurement engineering practices, and statistical analysis techniques. If problems are found they are analyzed to eliminate and prevent faults or delays.

Also, at Pohang Steelworks, each facility has their own characteristics from raw materials to end products. Producing coke, sinter, and pig iron is a near continuous process, but producing steel is a batch process. Respective rolling mills have different rolling schedules and maintenance periods. Upstream processes, such as the blast furnace, have a fixed maintenance schedule. Why is knowing the characteristics of the process important? The processes create by-product gases and if there is a break in the use of the gases, the furnace will need to be flared once the gasholders are full. This has a significant impact on the emissions intensity for the site. Pohang Works uses many kilometers of pipelines and multiple power plants in order to utilize all the by-product gases and my role is to eliminate the flaring ratio and to operate energy facilities with high efficiency. The most important job is to maintain the facilities so that they are in good condition and can operate when needed.

Inside steelmaking plant of POSCO (Image courtesy of World Steel Association)

For sites like POSCO, energy needs to be viewed holistically to be able to create a balanced energy generation system, which helps avoid waste in gas & electricity. There is a project currently underway to build a new integrated energy management system that will help optimize energy use and prevent waste.

More and more automakers around the world are focusing on sustainability and emission reduction. What kinds of benefits can sustainable materials like steel bring to the auto industry? Also, what is POSCO doing to help automakers manufacture more sustainable vehicles?

Steel is better than alternative materials like aluminum and carbon fiber composites for various reasons. Properties of steel vary greatly but it’s always adaptable to making new products for different end products. When the electric arc furnace (EAF) melts steel, it can be formed into a new product without a loss of quality. On the other hand, other alternative materials composed of alloys at a lower temperature remain as molten alloys, and they require additional processing to separate the various elements from the original material, which cannot always be done without a loss of quality. For steel, this is not a problem. Also, because of the sustainable life cycle of steel, automakers can recycle old automobiles into brand new cars without a reduction in quality.

Additionally, by replacing conventional steel materials with advanced high-strength steels (AHSS), drivers can reduce fuel usage by as much as 5% and greenhouse gas emissions by 6%.

POSCO has developed numerous lightweight solutions to enable automakers to produce lighter, more eco-friendly products with no reduction in strength and durability. Using more sustainable materials like POSCO GIGA STEEL can bring numerous benefits to the auto industry as it offers automakers the ability to produce stronger cars with fewer emissions.

For more information on POSCO GIGA STEEL, take a look at the 6 reasons why POSCO GIGA STEEL is Ideal for both automaker and consumers.