发明授权

  • 专利标题: High-carbon hot-rolled steel sheet, high-carbon cold-rolled steel sheet, and method of manufacturing the same
  • 专利标题(中): 高碳热轧钢板,高碳冷轧钢板及其制造方法
  • 申请号: US13824154
    申请日: 2011-09-15
  • 公开(公告)号: US09133532B2
    公开(公告)日: 2015-09-15
  • 发明人: Kyong-Su ParkHan-Chul Shin
  • 申请人: Kyong-Su ParkHan-Chul Shin
  • 申请人地址: KR Pohang-si
  • 专利权人: POSCO
  • 当前专利权人: POSCO
  • 当前专利权人地址: KR Pohang-si
  • 代理机构: The Webb Law Firm
  • 优先权: KR10-2010-0091086 20100916
  • 国际申请: PCT/KR2011/006812 WO 20110915
  • 国际公布: WO2012/036483 WO 20120322
  • 主分类号: C21D8/02
  • IPC分类号: C21D8/02 C22C38/04 C22C38/18 C21D9/46 C22C38/02 C22C38/00 C22C38/06
High-carbon hot-rolled steel sheet, high-carbon cold-rolled steel sheet, and method of manufacturing the same
摘要:
Provided is a method of manufacturing a high-carbon hot-rolled steel sheet, including the steps of i) preparing high-carbon steel materials comprising C: 0.7 to 0.9%, Si: 0.5% or less, Mn: 0.1 to 1.5%, Cr: 0.5% or less, P: 0.05% or less, and S: 0.03% or less in wt % and remaining Fe and other inevitable impurities; ii) heating the high-carbon steel materials again and manufacturing a steel sheet by performing hot rolling in an austenite region in which a finishing temperature for the hot rolling is an Ar3 transformation temperature or higher; iii) rapidly cooling the steel sheet at 520 to 620° C. before phase transformation is started in a Run-Out Table (ROT); iv) uniformly maintaining a cooling retention temperature so that the cooled steel sheet is subject to phase transformation in any one temperature between 520 to 620° C.; and v) winding the steel sheet in the cooling retention temperature. Also provided is the high-carbon steel sheet made by the above-described method.
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