C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/00 (2006.01) B21B 1/26 (2006.01) B21C 47/02 (2006.01) B23K 11/00 (2006.01) B23K 35/22 (2006.01) C21D 8/02 (2006.01) C22C 38/02 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01) C22C 38/50 (2006.01)
Patent
CA 2491307
A hot-rolled steel sheet for high-strength ERW pipes contains about 0.02% to about 0.06% C; about 0.05% to about 0.50% Si; about 0.5% to about 1.5% Mn; about 0.010% or less P; about 0.0010% or less S; about 0.01 % to about 0.10% Al; about 0.01 % to about 0.10% Nb; about 0.001% to about 0.025% Ti; about 0.001% to about 0.005% Ca; about 0.003% or less O; and about 0.005% or less N, and at least one element selected from the group consisting of about 0.01°k to about 0.10% V; about 0.01% to about 0.50% Cu; about 0.01% to about 0.50% Ni; and about 0.01 % to about 0.50% Mo on the basis of mass. The group of C, Si, Mn, Cu, Ni, Mo, and V and the group of Ca, O, and 5 satisfy specific relationships, and the microstructure of the steel sheet is composed of about 95% by volume or more bainitic ferrite.
Inazumi Toru
Kami Chikara
Kawamura Shuji
Kobayashi Takashi
Nakata Hiroshi
Jfe Steel Corporation
Moffat & Co.
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