发明名称 |
HOT-PRESSED STEEL SHEET MEMBER, METHOD OF MANUFACTURING THE SAME, AND STEEL SHEET FOR HOT PRESSING |
摘要 |
A hot-pressed steel sheet member includes a specific chemical composition and further includes a steel structure in which an area ratio of ferrite in a surface layer portion ranging from a surface to 15 μm in depth is equal to or less than 1.20 times an area ratio of ferrite in an inner layer portion being a portion excluding the surface layer portion, and the inner layer portion contains a steel structure represented, in area %, ferrite: 10% to 70%; martensite: 30% to 90%; and a total area ratio of ferrite and martensite: 90% to 100%. A concentration of Mn in the martensite is equal to or more than 1.20 times a concentration of Mn in the ferrite in the inner layer portion, and a tensile strength of the hot-pressed steel sheet member is 980 MPa or more. |
申请公布号 |
US2016312325(A1) |
申请公布日期 |
2016.10.27 |
申请号 |
US201315102042 |
申请日期 |
2013.12.27 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
HAYASHI Koutarou;NISHIBATA Toshinobu |
分类号 |
C21D9/46;C22C38/16;C22C38/14;C22C38/12;C21D7/13;C22C38/06;C22C38/04;C22C38/02;C22C38/00;C21D8/02;C22C38/38;C22C38/08 |
主分类号 |
C21D9/46 |
代理机构 |
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代理人 |
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主权项 |
1. A hot-pressed steel sheet member, comprising:
a chemical composition represented by, in mass %:
C: 0.10% to 0.34%;Si: 0.5% to 2.0%;Mn: 1.0% to 3.0%;sol. Al: 0.001% to 1.0%;P: 0.05% or less;S: 0.01% or less;N: 0.01% or less;Ti: 0% to 0.20%;Nb: 0% to 0.20%;V: 0% to 0.20%;Cr: 0% to 1.0%;Mo: 0% to 1.0%;Cu: 0% to 1.0%;Ni: 0% to 1.0%;Ca: 0% to 0.01%;Mg: 0% to 0.01%;REM: 0% to 0.01%;Zr: 0% to 0.01%;B: 0% to 0.01%;Bi: 0% to 0.01%; andbalance: Fe and impurities; and a steel structure in which:
an area ratio of ferrite in a surface layer portion ranging from a surface to 15 μm in depth is equal to or less than 1.20 times an area ratio of ferrite in an inner layer portion being a portion excluding the surface layer portion; andthe inner layer portion comprises a steel structure represented, in area %:
ferrite: 10% to 70%;martensite: 30% to 90%; anda total area ratio of ferrite and martensite: 90% to 100%, wherein a concentration of Mn in the martensite is equal to or more than 1.20 times a concentration of Mn in the ferrite, in the inner layer portion, and wherein a tensile strength of the hot-pressed steel sheet member is 980 MPa or more. |
地址 |
Tokyo JP |