| 发明名称 | High strength steel sheet and method for manufacturing the same | ||
| 摘要 | A high-strength steel sheet includes a composition containing, in mass percent, 0.08% to 0.20% of carbon, 0.2% to 1.0% of silicon, 0.5% to 2.5% of manganese, 0.04% or less of phosphorus, 0.005% or less of sulfur, 0.05% or less of aluminum, 0.07% to 0.20% of titanium, and 0.20% to 0.80% of vanadium, the balance being iron and incidental impurities. | ||
| 申请公布号 | US9212411(B2) | 申请公布日期 | 2015.12.15 |
| 申请号 | US201013381992 | 申请日期 | 2010.06.29 |
| 申请人 | JFE Steel Corporation | 发明人 | Nakagawa Koichi;Yokota Takeshi;Seto Kazuhiro;Kinoshiro Satoshi;Tanaka Yuji;Yamada Katsumi;Mega Tetsuya;Nakajima Katsumi |
| 分类号 | C21D9/28;C22C38/12;C22C38/02;C21D8/02;C22C38/04;C22C38/06;C22C38/14;C22C38/24;C22C38/28 | 主分类号 | C21D9/28 |
| 代理机构 | DLA Piper LLP (US) | 代理人 | DLA Piper LLP (US) |
| 主权项 | 1. A high-strength steel sheet comprising a composition containing, in mass percent, 0.08% to 0.20% of carbon, 0.2% to 1.0% of silicon, 0.5% to 2.5% of manganese, 0.04% or less of phosphorus, 0.005% or less of sulfur, 0.05% or less of aluminum, 0.07% to 0.20% of titanium, and 0.30% to 0.80% of vanadium, the balance being iron and incidental impurities, and having a metallographic structure comprising 80% to 98% by volume of a ferrite phase and a second phase, wherein a sum of amounts of titanium and vanadium contained in precipitates having a size of less than 20 nm is 0.150% by mass or more, and a difference (HVα−HVS) between hardness (HVα) of the ferrite phase and hardness (HVS) of the second phase is −300 to 300. | ||
| 地址 | JP | ||