From a low-P (0. 006% max), low-S(0. 002% max) continuously cast slab, 9% Ni steel plates for LNG storage tanks were produced by the direct quenching and tempering process (MACS-T) and reheat-quenching and tempering process (RQ-T). In the MACS-T process, slab-reheating and finish-rolling temperatures were increased in order to increase ductile fracture energy by decreasing the amount of precipitated austenite. Reliability for LNG storage tanks was examined by conducting fracture toughness tests on these steel plates and their welded joints. As a result, it was shown that these steel plates and their welded joints had good crack initiation and arrest toughness.
|ジャーナル||Kawasaki Steel Technical Report|
|出版ステータス||出版済み - 10 1 1987|
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