High yield ratio and high-strength thin steel sheet superior...

Details High yield ratio and high-strength thin steel sheet superior... High yield ratio and high-strength thin steel sheet superior...

C - Chemistry, Metallurgy

22

C

C22C 38/14 (2006.01) C21D 9/46 (2006.01) C22C 38/40 (2006.01) C22C 38/42 (2006.01) C22C 38/48 (2006.01) C22C 38/50 (2006.01) C22C 38/54 (2006.01) C23C 2/06 (2006.01)

Patent

CA 2747654

High yield ratio high-strength thin steel sheet superior in weldability and ductility characterized by; being comprised of steel containing, by mass%, C: over 0.030 to less than 0.10%, Si: 0.30 to 0.80%, Mn: 1.7 to 3.2%, P: 0.001 to 0.02%, S: 0.0001 to 0.006%, Al: 0.060% or less, N: 0.0001 to 0.0070%, containing further Ti: 0.01 to 0.055%, Nb: 0.012 to 0.055%, Mo: 0.07 to 0.55%, B: 0.0005 to 0.0040%, and simultaneously statisfying 1.1<=14xTi(%)+20xNb(%)+3xMo($)+300xB(%)<=3.7, the balance comprised of iron and unavoidable impurities, and having a yield ratio of 0.64 to less than 0.92, a TSxEl of 3320 or more, an YRxTSxEl1/2 of 2320 or more, and a maximum tensile strength (TS) of 780 MPa or more.

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