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    • 62. 发明授权
    • High tensile strength steel sheet excellent in processibility and process for manufacturing the same
    • 加工性优异的高抗拉强度钢板及其制造方法
    • US07455736B2
    • 2008-11-25
    • US10928176
    • 2004-08-30
    • Takahiro KashimaKoichi Sugimoto
    • Takahiro KashimaKoichi Sugimoto
    • C22C38/06C22C38/04C21D8/02
    • C22C38/02C21D1/185C21D1/20C21D8/0273C21D8/0278C21D9/52C21D2211/001C21D2211/002C21D2211/008C22C38/04C22C38/06Y10T428/12799
    • A high tensile strength steel sheet excellent in processibility which can satisfy a strength, a total elongation, and stretch-flanging property (hole enlarging rate) at a further high level. and comprises a matrix microstructure of tempered martensite or tempered bainite and, if necessary, ferrite, and a second phase of retained austenite, wherein (1) the steel comprising C: 0.10 to 0.6 mass %, Si: 1.0 mass % or smaller, Mn: 1.0 to 3 ,mass %, Al: 0.3 to 2.0 mass %, P: 0.02 mass % or smaller, S: 0.03 mass % or smaller, (2) a volume rate of retained austenite obtained by a saturated magnetization measuring method is 5 to 40% by area (whole field is 100%), and (3) a relationship of a carbon amount (C: weight %) in the steel, a volume rate (fγR) of retained austenite and a carbon concentration (CγR) of the retained austenite satisfies the equation: (fγR×CγR)/C≧50 .   (I)
    • 能够在更高的水平上满足强度,总伸长率和拉伸翻边性(扩孔率)的加工性优异的高抗拉强度钢板。 并且包括回火马氏体或回火贝氏体的基体微观结构,如果需要,还包括铁素体和第二相残留奥氏体,其中(1)包含C:0.10〜0.6质量%,Si:1.0质量%以下的钢,Mn :1.0〜3质量%,Al:0.3〜2.0质量%,P:0.02质量%以下S:0.03质量%以下,(2)通过饱和磁化测定法得到的残留奥氏体的体积率为5 至40%(全田为100%),(3)钢中碳量(C:重量%)的关系,残留奥氏体的体积率(fgammaR)和碳浓度(CgammaR)的关系 残留奥氏体满足以下等式:<?in-line-formula description =“In-line Formulas”end =“lead”?>(fgammaRxCgammaR)/ C> = 50。 (I)<?in-line-formula description =“In-line Formulas”end =“tail”?>
    • 64. 发明授权
    • Composite structure sheet steel with excellent elongation and stretch flange formability
    • 复合结构钢板具有优异的伸长率和拉伸凸缘成形性
    • US07413617B2
    • 2008-08-19
    • US11290640
    • 2005-12-01
    • Shushi IkedaKoichi SugimotoYoichi MukaiHiroshi Akamizu
    • Shushi IkedaKoichi SugimotoYoichi MukaiHiroshi Akamizu
    • C22C38/02C22C38/06C21D8/02
    • C21D8/02C21D9/46C22C1/06C22C38/02C22C38/04
    • The present invention provide a TRIP-type composite structure steel plate of the TPF steel type in which elongation and stretch flange formability at room temperature are improved by controlling the morphology of the second-phase structure. In a composite structure sheet steel comprising 0.02 to 0.12% C, 0.5 to 2.0% Si+Al and 1.0 to 2.0% Mn, with the remainder being Fe and unavoidable impurities, and comprising 80% or more polygonal ferrite (steel structure space factor) and 1 to 7% retained austenite, with the remainder being bainite and/or martensite, wherein the elongation and stretch flange formability of the composite sheet steel are improved by reducing the number of bulky, massive second phases with an aspect ratio of 1:3 or less and a mean grain size of 0.5 μm or more in the second phase of this composite structure, which comprises retained austenite and martensite.
    • 本发明提供一种TPF钢型的TRIP型复合结构钢板,通过控制第二相结构的形态,提高室温下的伸长率和拉伸凸缘成形性。 在包含0.02至0.12%的C,0.5至2.0%的Si + Al和1.0至2.0%Mn的复合结构钢板中,其余为Fe和不可避免的杂质,并且包含80%或更多的多边形铁素体(钢结构空间系数) 和1〜7%的残余奥氏体,其余为贝氏体和/或马氏体,其中复合片材钢的伸长率和拉伸凸缘成形性通过减少长宽比为1:3的体积大的质量第二相的数量而得到改善 该复合结构的第二相中的平均粒径为0.5μm以上,其包含残留奥氏体和马氏体。