
基本信息:
- 专利标题: 高强度热轧钢板及其制造方法
- 申请号:CN201880012139.4 申请日:2018-02-06
- 公开(公告)号:CN110312814A 公开(公告)日:2019-10-08
- 发明人: 山崎和彦 , 丰田俊介 , 森安永明 , 海宝寿实雄
- 申请人: 杰富意钢铁株式会社
- 申请人地址: 日本东京
- 专利权人: 杰富意钢铁株式会社
- 当前专利权人: 杰富意钢铁株式会社
- 当前专利权人地址: 日本东京
- 代理机构: 中原信达知识产权代理有限责任公司
- 代理人: 盛曼; 金龙河
- 优先权: 2017-027510 2017.02.17 JP
- 国际申请: PCT/JP2018/004043 2018.02.06
- 国际公布: WO2018/150955 JA 2018.08.23
- 进入国家日期: 2019-08-15
- 主分类号: C22C38/00
- IPC分类号: C22C38/00 ; C21D9/46 ; C22C38/38 ; C22C38/60
Provided are: a high strength hot-rolled steel sheet which exhibits excellent press moldability and toughness at low temperatures, while having a tensile strength TS of 980 MPa or more; and a method for producing this high strength hot-rolled steel sheet. This high strength hot-rolled steel sheet has a predetermined component composition, while having a structure wherein: an upper bainite phases in an area ratio of 75.0% or more but less than 97.0% forms main phases that have an average particle diameter of 12.0 μm or less; a lower bainite phase and/or one or more phases selected from among a tempered martensite phase and a martensite phase in an area ratio of more than 3.0% but 25.0% or less forms second phases; and the number density of the second phases having a circle-equivalent diameter of 0.5 μm or more is 150,000 pieces/mm2 or less. In addition, the arithmetic mean roughness (Ra) of the steel sheet surface is 2.00 μm or less.
公开/授权文献:
- CN110312814B 高强度热轧钢板及其制造方法 公开/授权日:2021-10-01
IPC结构图谱:
C | 化学;冶金 |
--C22 | 冶金(铁的冶金入C21);黑色或有色金属合金;合金或有色金属的处理 |
----C22C | 合金 |
------C22C38/00 | 铁基合金,例如合金钢 |