Metallurgical Design of Steel Plates with Advanced Cryogenic Properties for Fabrication of Pressurized-LNG Containers

摘要

This paper discusses the plate development technology for manufacture of the containment system for a new concept of transporting gas by Pressurized LNG. The plates to produce the cylindrical containment system were required to exhibit a combination of strength and toughness at cryogenic temperatures down to - 101℃ (172 K). The plate toughness was achieved over a range of nickel contents from 2% to 5%, by chemistry control, thermo-mechanical processing and controlled cooling to achieve a combination of martensite, fine granular bainite (FGB) and retained austenite. It was observed that the formation of FGB was required to achieve the toughness.