High-strength steel sheets excellent in hole-expandability...

Details High-strength steel sheets excellent in hole-expandability... High-strength steel sheets excellent in hole-expandability...

C - Chemistry, Metallurgy

22

C

C22C 38/04 (2006.01) C21D 8/02 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01)

Patent

CA 2676781

High-strength steel sheet excellent in hole- expandability and ductility, characterized by; comprising, in mass%, C: not less than 0.01 % and not more than 0.20 %, Si: not more than 1.5 %, Al: not more than 1.5 %, Mn: not less than 0.5 % and not more than 3.5 %, P: not more than 0.2 %, S: not less than 0.0005 % and not more than 0.009 %, N: not more than 0.009 %, Mg: not less than 0.0006 % and not more than 0.01 %, O: not more than 0.005 % and Ti: not less than 0.01 % and not more than 0.20 % and/or Nb: not less than 0.01 % and not more than 0.10 %, with the balance consisting iron and unavoidable impurities, having Mn%, Mg%, S% and O% satisfying equations (1) to (3), and having the structure primarily comprising one or more of ferrite, bainite and martensite. [Mg%]>=([O%]/16x0.8)x24 .multidot. (1) [So]<=([Mg%]/24-[O%]/16x0.8+0.00012)x32 .multidot. (2) [S%]<=0.0075/[Mn%] .multidot. (3)

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