C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/18 (2006.01) B21B 3/02 (2006.01) B21B 23/00 (2006.01) C21D 8/10 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) F16L 9/02 (2006.01)
Patent
CA 2388398
A welded steel pipe is formed by heating or soaking an untreated welded steel pipe having a steel composition containing, on the basis of mass percent: about 0.05% to about 0.2% C; about 0.2% or less of Si; about 1.5% or less of Mn; about 0.1% or less of P; about 0.01% or less of S; about 0.1% or less of Al; and about 0.01% or less of N; and by reduction- rolling the treated steel pipe at a cumulative reduction rate of at least about 35% and a final rolling temperature of about 500°C to about 900°C. The welded steel pipe exhibits excellent hydroformability, i.e., has a tensile strength of at least about 400 MPa and an n×r product of at least about 0.22. The treated steel pipe is preferably reduction-rolled at a cumulative reduction rate of at least about 20% below the Ar3 transformation point. The welded steel pipe is suitable for forming structural components.
Aratani Masatoshi
Hashimoto Yuji
Kawabata Yoshikazu
Kimura Mitsuo
Nagahama Takuya
Jfe Steel Corporation
Kawasaki Steel Corporation
Smart & Biggar
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