STEEL SHEET FOR HOT STAMPING, METHOD OF MANUFACTURING THE SAME, AND HOT STAMPED STEEL SHEET MEMBER

摘要

A steel sheet for hot stamping includes a predetermined chemical composition containing: C: 0.08% or more and less than 0.20%; Si: 0.003% to 0.2%; Mn: 1.6% to 3.5%, and others, and further includes a steel structure expressed by, in an area ratio: bainite: 1% to 95%; ferrite: 5% to 94%; and balance: one or more selected from the group consisting of pearlite, martensite and retained austenite. When an Mn content is represented by [Mn], a C content is represented by [C], an expression of “[Mn]+6.67×[C]−2.73≧0” is satisfied.

主权项

1. A steel sheet for hot stamping, comprising
a chemical composition expressed by, in mass %:
C: 0.08% or more and less than 0.20%;Si: 0.003% to 0.2%;Mn: 1.6% to 3.5%;sol. Al: 0.0002% to 2.0%;B: 0.0003% to 0.01%;P: 0.1% or less;S: 0.004% or less;N: 0.01% or less;Ti: 0% to 0.04+48/14×[N] % when an N content is expressed by [N];Cr: 0% to 1.00%;Bi: 0% to 0.5%;Ca: 0% to 0.05%;Mg: 0% to 0.05%;REM: 0% to 0.05%;Mo: 0% to 1%;Cu: 0% to 1%;Ni: 0% to 1%;W: 0% to 1%;Nb: 0% to 1%;V: 0% to 1%;balance: Fe and impurities, wherein: an expression (1) is satisfied when an Mn content is represented by [Mn] and a C content is represented by [C],
where [Mn]+6.67×[C]−2.73≧0  (1);and
the steel sheet comprises a steel structure expressed by, in an area ratio:
bainite: 1% to 95%;ferrite: 5% to 94%; andbalance: one or more selected from the group consisting of pearlite, martensite and retained austenite.