Paper: Near Neutral pH SCC Properties of Grade X80 Linepipe Steels (CORROSION 2009 (March 22-26, 2009))

Thursday, March 26, 2009: 8:55 AM

C304 (Georgia World Congress Center)

Tomohiko Omura , Sumitomo Metal Industries, Ltd., Amagasaki, Japan

Hisashi Amaya , Sumitomo Metal Industries, Ltd., Amagasaki, Japan

Hitoshi Asahi , Nippon Steel Corporation, Chiba-ken 293, Japan

Mitsuru Sawamura , Nippon Steel Corporation, Futtsu, Japan

Mitsuo Kimura , JFE Steel Corporation, Handa Aichi, Japan

Nobuyuki Ishikawa , JFE Steel Corporation, Kurashiki, Japan

Susceptibility to Stress Corrosion Cracking (SCC) of Grade X80 linepipe steels was investigated in near neutral pH conditions in comparison with a conventional Grade X65 linepipe. Both grades were manufactured by recent TMCP processes. SCC properties were evaluated by cyclic loading tensile tests and constant load tests in a NS4 solution under cathodic charging. Test results show that the Grade X80 and X65 revealed similar susceptibility to SCC, indicating that the Grade X80 have sufficient SCC resistance. The SCC mechanism was discussed from viewpoints of corrosion reactions and hydrogen absorption into the steels. This study was carried out through the High Strength Linepipe (HLP) Committee in the Iron and Steel Institute of Japan (ISIJ).

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09092 Near Neutral pH SCC Properties of Grade X80 Linepipe Steels