Upon completion, the Green Iris will transport limestones from the port of Donghae in Gangwon-do to Gwangyang Works from the beginning of 2018.

POSCO’s high manganese steel allows the fuel tank to withstand temperatures as low as -196℃, so that it can store and transfer LNG. Moreover, it is highly weldable and cost-efficient compared to other common materials for LNG fuel tanks such as nickel steel or aluminum alloys.

POSCO developed the technology for its high manganese steel after 10 years of research since the late 2000s. Now, it is one of POSCO’s leading World Premium Products (WPP). Due to strengthening environmental regulations worldwide on emissions of sulfur oxides, nitrogen oxides and carbon dioxide from vessels, demand for high manganese steel for LNG tanks are expected to increase dramatically.

Cover photo courtesy of Gas Asia Summit.

POSCO recently completed STEP development, and applied it to the hull of Hyundai Samho Heavy Industries’ ships. STEP is a thick plate product with varying thicknesses that form a gentle slope on a single steel plate. Applying STEP will enable shipbuilders to skip the welding process, reducing labor costs and delivery time. POSCO is the only domestic steel maker to have developed the technology on its own.

Employees of the two companies are standing in front of the hull that was assembled using STEP.

In shipbuilding yards, the thickness of thick plates varies depending on the amount of pressure applied during construction. As the welding of thick plates of different thicknesses involves excessive man-hours, back-end processing is occasionally delayed. In order to help its partner overcome such difficulties, POSCO began to develop the technology for STEP in 2015 in collaboration with Hyundai Samho Heavy Industries. They acquired a classification certification last March for the technology and successfully applied it to an actual shop after several field application tests.

STEP is also expected to benefit domestic shipbuilders currently suffering from the recent global recession of the shipbuilding industry, by helping them reduce costs and increase productivity. Shipowners will also benefit from the improved quality and shortened inspection time.

VP Sang-gyun Lee of Hyundai Samho Heavy Industries explains the development progress of the hull block at the ceremony held to celebrate the first application of STEP.

Officials from Hyundai Samho conveyed to POSCO the difficulties they had on the shop floor over the years before applying STEP, and said, “The use of STEP is expected to secure working space, reduce bottlenecks and welding man-hours, and thus save costs by more than KRW 60 million per ship.”

POSCO is planning to mass-produce STEP starting next year, and expand its application to other industries, such as bridges.

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