| 摘要 |
The present invention produces a hot-formed steel sheet member which has the following: a chemical composition that contains, in terms of mass%, 0.100%-0.340% of C, 0.50%-2.00% of Si, 1.00%-3.00% of Mn, 0.050% or less of P, 0.0100% or less of S, 0.001%-1.000% of sol. Al and 0.0100% or less of N, with the remainder consisting of Fe and impurities; and a steel structure that contains, in terms of areal percentage, 5%-50% of ferrite, a total of 20%-70% of tempered martensite and/or tempered bainite, and 25%-75% of martensite, with the total areal percentage of these being 90% or more, and that also contains 0%-5% of retained austenite. The hot-formed steel sheet member exhibits high strength as well as excellent ductility and bendability. |
