C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/14 (2006.01) B21B 1/26 (2006.01) B21B 3/02 (2006.01) B21C 37/08 (2006.01) C21D 8/02 (2006.01) C21D 8/10 (2006.01) C22C 38/04 (2006.01) C22C 38/12 (2006.01)
Patent
CA 2424491
The present invention provides a line pipe of the API standard X60 to X100 class, the line pipe having excellent deformability as well as excellent low temperature toughness and high productivity, a steel plate used as the material of the steel pipe, and methods for producing the steel pipe and the steel plate: in particular, a high-strength steel plate excellent in deformability wherein a ferrite phase is dispersed finely and accounts for 5 to 40% in area percentage in a low temperature transformation structure mainly composed of a bainite phase and most grain sizes of the ferrite phase are smaller than the average grain size of the bainite phase; a high-strength steel pipe excellent in deformability, in particular, a large diameter steel pipe produced through forming the steel plate into a pipe shape, the steel pipe having the aforementioned structure and satisfying the conditions that YS/TS is 0.95 or less and YS × uEL is 5,000 or more; and methods for producing the steel plate and the steel pipe.
Asahi Hitoshi
Hara Takuya
Shinohara Yasuhiro
Goudreau Gage Dubuc
Nippon Steel Corporation
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