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    • 8. 发明授权
    • High-strength steel sheet having excellent workability and production process therefor
    • 具有优异的加工性的高强度钢板及其制造方法
    • US07008488B2
    • 2006-03-07
    • US10614821
    • 2003-07-09
    • Hiroshi AkamizuShushi IkedaKoichi Makii
    • Hiroshi AkamizuShushi IkedaKoichi Makii
    • C22C38/02C22C38/04C21D8/02
    • C21D8/021C21D1/19C21D8/0226C21D2211/001C21D2211/005C21D2211/008C22C38/02C22C38/04
    • A high-strength steel sheet comprises carbon: 0.06 to 0.25 mass %, Si: 0.5 to 3.5 mass % and Mn: 0.7 to 4 mass %. Its mother structure is ferrite, its second phase structure comprises martensite and the residual austenite and the second phase structure measured by image analysis has an area fraction of 25% or less based on the total structure. The steel sheet satisfies the following requirements (1) to (3): (1) the volume fraction (Vtγhd R) of the residual austenite is 5% or more; (2) the ratio (SFγR/VtγR) of the area fraction (SFγR) of the residual austenite within ferrite to VtγR is 0.65 or more; and (3) the ratio [α2/(α1+γR)] of the space factor (α2) of martensite to the second phase structure (α1+γR) is 0.25 to 0.60. The steel sheet has excellent balance between strength and local elongation, and a low yield ratio.
    • 高强度钢板包含:0.06〜0.25质量%的碳,Si:0.5〜3.5质量%,Mn:0.7〜4质量%。 其母体结构是铁素体,其第二相结构包括马氏体,残余奥氏体和通过图像分析测量的第二相结构基于总结构具有25%或更小的面积分数。 钢板满足以下要求(1)〜(3):(1)残余奥氏体的体积分数(Vtgammahd R)为5%以上; (2)铁素体中的残余奥氏体的面积率(SFgamma R)与Vtgamma之间的比值(SFgamma R/ Vtgamma R) R S为0.65以上; 和(3)马氏体相对于第二相结构(α1+γ')的空间因子(α2)的比值[α2/(α1+γ' 为0.25〜0.60。 钢板在强度和局部伸长率之间具有优异的平衡,并且产率低。