C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
327/38, 327/40,
C22C 38/14 (2006.01) B23K 9/025 (2006.01) B23K 9/028 (2006.01) B23K 9/18 (2006.01) B23K 35/30 (2006.01) C22C 38/18 (2006.01)
Patent
CA 2231985
The present invention is a welded high-strength steel structure having a TS of not less than 900 MPa and excellent low-temperature toughness and a method of manufacturing the steel structure. The base steel is for. med of a mixed structure of martensite and lower bainite and has a TS of not less than 900 MPa, and the weld metal is steel which has the following elements based on % by weight: C: 0.01% to 0.15%; Si: 0.02% to 0.6%; Mn: 0.6% to 3%; Al: 0.004% to 0.08%; Ti: 0.003% to 0.03%; O (oxygen): not greater than 0.06%; B: 0.0002% to 0.00%; and as optional components, Cu, Ni, Cr, Mo, V, and Nb and which satisfies the following two equations: 0.25 <= Pcm <= 0.32 and 0.6 <= Al/O (oxygen) <= 1.4.
Hamada Masahiko
Komizo Yu-Ichi
Moncho Takeshi
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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