Abstract
Advanced TMCP products, such as X80/X100 linepipe steels and YS 460MPa grade shipbuilding steel, have been developed by POSCO. In order to apply X80/X100 linepipe to strain-based design (SBD) concept, the main issue is to prevent strain aging after thermal coating. In case of YS 460MPa shipbuilding steel, challenging study is necessary to increase plate thickness up to 80 mm without deterioration of strength and toughness. It was found that solute carbon started to segregate at dislocation tangles in coarse ferrite during and after UOE pipe forming, resulting in strain aging. And it was shown that the optimum microstructure of X80 and X100 steels was the mixture of acicular ferrite, bainitic ferrite and fine ferrite. Those X80 and X100 steels revealed good strain hardening resistance as well as reasonable compressive strain capacity. The developed YS 460MPa grade steel plate for shipbuilding showed a good mechanical property at quarter and mid-thickness and also an excellent weldability. It was confirmed that the developed steel had a high CTOD value both HAZ and base metal to prevent an initiation of brittle crack and a good crack arrestablity to suppress long distance propagation of brittle crack.
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Kang, K.B., Kang, J.S., Yoo, J.Y., Seo, D.H., Suh, I.S., An, G.B. (2011). Development of High Strength and High Performance Linepipe and Shipbuilding Steels. In: Weng, Y., Dong, H., Gan, Y. (eds) Advanced Steels. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-17665-4_29
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DOI: https://doi.org/10.1007/978-3-642-17665-4_29
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