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    • 2. 发明专利
      DE69228403T2  未知
    • DE69228403T2
    • 1999-06-24
    • DE69228403
    • 1992-04-27
    • KAWASAKI STEEL CO
    • OKADA SUSUMU , SAKATA KEI , SATOH SUSUMU , MORITA MASAHIKO , KATO TOSHIYUKI
    • C21D1/18 , C21D8/04 , C22C38/12
    • The invention in its first aspect provides a high strength cold rolled steel sheet having excellent non-aging property at room temperature and excellent drawability, said steel sheet having a dual-phase structure composed of a high-temperature transformed ferrite phase and a low-temperature transformed ferrite phase having high dislocation density, said steel sheet having a composition which essentially contains: not less than 0.001 wt% but not more than 0.025 wt% of C, not more than 1.0 wt% of Si, not less than 0.1 wt% but not more than 2.0 wt% of Mn, not less than 0.001 wt% but not more than 0.2 wt% of Nb, not less than 0.0003 wt% but not more than 0.01 wt% of B, not less than 0.005 wt% but not more than 0.10 wt% of Al, not more than 0.1 wt% of P, not more than 0.007 wt% of N, at least one selected from a group consisting of not less than 0.05 wt% but not more that 3.0 wt% of Ni, not less than 0.01 wt% but not more than 2.0 wt% of Mo and not less than 0.05 wt% but not more than 5.0 wt% of Cu, and the balance being substantially Fe with inevitable impurities. This steel sheet is produced by preparing a hot-rolled steel sheet having the above-specified composition, cold rolling the hot-rolled steel sheet at a rolling reduction not smaller than 60 %, annealing the cold rolled steel sheet at a temperature which is not lower than the gamma transformation start temperatures but below the Ac3 transformation temperature, and cooling the annealed steel sheet at a rate not smaller than 5 DEG C/sec but not greater than 100 DEG C/sec. The invention in its second aspect provides a high strength cold rolled steel sheet having excellent non-aging property at room temperature and bake hardenability, as well as excellent drawability, said steel sheet exhibiting a tensile strength not smaller than 45 Kgf/mm and having a dual-phase structure composed of a high-temperature transformed ferrite phase and a low-temperature transformed ferrite phase having high dislocation density, said steel sheet having a composition which essentially contains: more than 0.008 wt% but not more than 0.025 wt% of C, not more than 1.0 wt% of Si, not less than 0.1 wt% but not more than 2.0 wt% of Mn, not more than 0.2 wt% but not less than five times the content of C of Nb, not less than 0.0003 wt% but not more than 0.01 wt% of B, not less than 0.005 wt% but not more than 0.10 wt% of Al, not more than 0.1 wt% of P, not more than 0.007 wt% of N, and the balance being substantially Fe with inevitable impurities. This steel sheet is produced by preparing a hot-rolled steel sheet having the above-specified composition, cold rolling the hot-rolled steel sheet at a rolling reduction not smaller than 60 %, annealing the cold rolled steel sheet at a temperature which is not lower than the gamma transformation start temperature but below the Ac3 transformation temperature, and cooling the annealed steel sheet at a rate not smaller than 5 DEG C/sec but not grater than 100 DEG C/sec.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 7. 发明专利
      CA2067043A1 HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT NON-AGING PROPERTY AT ROOM TEMPERATURE AND SUITABLE FOR DRAWING AND METHOD OF PRODUCING THE SAMEN 未知
    • HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT NON-AGING PROPERTY AT ROOM TEMPERATURE AND SUITABLE FOR DRAWING AND METHOD OF PRODUCING THE SAMEN
    • CA2067043A1
    • 1992-10-27
    • CA2067043
    • 1992-04-24
    • KAWASAKI STEEL CO
    • OKADA SUSUMU , SAKATA KEI , SATOH SUSUMU , MORITA MASAHIKO , KATO TOSHIYUKI
    • C21D1/18 , C21D8/04 , C22C38/12 , C22C38/44 , C22C38/42 , C22C38/58 , C22C38/54
    • The invention in its first aspect provides a high strength cold rolled steel sheet having excellent non-aging property at room temperature and excellent drawability, said steel sheet having a dual-phase structure composed of a high-temperature transformed ferrite phase and a low-temperature transformed ferrite phase having high dislocation density, said steel sheet having a composition which essentially contains: not less than 0.001 wt% but not more than 0.025 wt% of C, not more than 1.0 wt% of Si, not less than 0.1 wt% but not more than 2.0 wt% of Mn, not less than 0.001 wt% but not more than 0.2 wt% of Nb, not less than 0.0003 wt% but not more than 0.01 wt% of B, not less than 0.005 wt% but not more than 0.10 wt% of Al, not more than 0.1 wt% of P, not more than 0.007 wt% of N, at least one selected from a group consisting of not less than 0.05 wt% but not more that 3.0 wt% of Ni, not less than 0.01 wt% but not more than 2.0 wt% of Mo and not less than 0.05 wt% but not more than 5.0 wt% of Cu, and the balance being substantially Fe with inevitable impurities. This steel sheet is produced by preparing a hot-rolled steel sheet having the above-specified composition, cold rolling the hot-rolled steel sheet at a rolling reduction not smaller than 60 %, annealing the cold rolled steel sheet at a temperature which is not lower than the gamma transformation start temperatures but below the Ac3 transformation temperature, and cooling the annealed steel sheet at a rate not smaller than 5 DEG C/sec but not greater than 100 DEG C/sec. The invention in its second aspect provides a high strength cold rolled steel sheet having excellent non-aging property at room temperature and bake hardenability, as well as excellent drawability, said steel sheet exhibiting a tensile strength not smaller than 45 Kgf/mm and having a dual-phase structure composed of a high-temperature transformed ferrite phase and a low-temperature transformed ferrite phase having high dislocation density, said steel sheet having a composition which essentially contains: more than 0.008 wt% but not more than 0.025 wt% of C, not more than 1.0 wt% of Si, not less than 0.1 wt% but not more than 2.0 wt% of Mn, not more than 0.2 wt% but not less than five times the content of C of Nb, not less than 0.0003 wt% but not more than 0.01 wt% of B, not less than 0.005 wt% but not more than 0.10 wt% of Al, not more than 0.1 wt% of P, not more than 0.007 wt% of N, and the balance being substantially Fe with inevitable impurities. This steel sheet is produced by preparing a hot-rolled steel sheet having the above-specified composition, cold rolling the hot-rolled steel sheet at a rolling reduction not smaller than 60 %, annealing the cold rolled steel sheet at a temperature which is not lower than the gamma transformation start temperature but below the Ac3 transformation temperature, and cooling the annealed steel sheet at a rate not smaller than 5 DEG C/sec but not grater than 100 DEG C/sec.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
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