| 摘要 |
A high strength steel sheet exhibiting good burring workability and excellen t resistance to the softening in a heat-affected zone, characterized in that i t has a chemical composition, in mass %: C: 0.01 to 0.1 %, Si: 0.01 to 2 %, Mn : 0.05 to 3 %, P <= 0.1 %, S <= 0.03 %, Al: 0.005 to 1 %, N: 0.0005 to 0 .005 %, Ti: 0.05 to 0.5 %, Cr <= 0.5 %, Mo <= 0.5 %, with the proviso that 0 % < C - (12/48Ti - 12/14N - 12/32S) <= 0.05 % and Mo + Cr >= 0.2 %, and the ba lance: Fe and inevitable impurities, and has a microstructure comprising ferrite or ferrite and bainite; and a method for producing the high strength steel shee t.
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