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    • 9. 发明申请
    • A COLD-ROLLED STEEL SHEET HAVING A TENSILE STRENGTH OF 780 MPA OR MORE AN EXCELLENT LOCAL FORMABILITY AND A SUPPRESSED INCREASE IN WELD HARDNESS
    • 具有780 MPA或更高的拉伸强度的冷轧钢板,具有优异的局部可承受性和在焊接硬度中的抑制增加
    • WO2004104256A1
    • 2004-12-02
    • PCT/JP2004/000126
    • 2004-01-09
    • NIPPON STEEL CORPORATIONGOTO, KoichiOKAMOTO, RikiTANIGUCHI, Hirokazu
    • GOTO, KoichiOKAMOTO, RikiTANIGUCHI, Hirokazu
    • C22C38/04
    • C22C38/02C21D8/02C21D2211/001C21D2211/002C21D2211/005C21D2211/008C22C38/04C22C38/06C22C38/14Y10T428/12799Y10T428/12965
    • The present invention provides a high-strength cold-rolled steel sheet and a high-strength surface treated steel sheet 780 MPa or more in tensile strength, said steel sheets having excellent local formability and suppressed weld hardness increase and being characterized by: said steel sheets containing, in weight, C: 0.05 to 0.09%, Si: 0.4 to 1.3%, Mn: 2.5 to 3.2%, P: 0.001 to 0.05%, N: 0.0005 to 0.006%, Al: 0.005 to 0.1%, Ti: 0.001 to 0.045%, and S in the range stipulated by the following expression (A), with the balance consisting of Fe and unavoidable impurities; the microstructures of said steel sheets being composed of bainite of 7% or more in terms of area percentage and the balance consisting of one or more of ferrite, martensite, tempered martensite and retained austenite; and said components in said steel sheets satisfying the following expressions (C) and (D) when Mneq. is defined by the following expression (B); S ≤ 0.08 x (Ti(%) - 3.43 x N(%)) + 0.004... (A), where, when a value of the member Ti(%) - 3.43 x N(%) of said expression (A) is negative, the value is regarded as zero, Mneq. = Mn(%) - 0.29 x Si(%) + 6.24 x C(%) ... (B), 950 ≤ (Mneq./(C(%) - (Si(%)/75))) x bainite area percentage (%)... (C), C(%) + (Si(%)/20) + (Mn(%)/18) 5 0.30... (D).
    • 本发明提供了拉伸强度为780MPa以上的高强度冷轧钢板和高强度表面处理钢板,所述钢板具有优异的局部成形性和抑制的焊接硬度,并且其特征在于:所述钢板 含有C:0.05〜0.09%,Si:0.4〜1.3%,Mn:2.5〜3.2%,P:0.001〜0.05%,N:0.0005〜0.006%,Al:0.005〜0.1%,Ti:0.001 至0.045%,S在下述表达式(A)所规定的范围内,余量由Fe和不可避免的杂质构成; 所述钢板的微结构由面积百分比为7%以上的贝氏体组成,余量由铁素体,马氏体,回火马氏体和残余奥氏体中的一种以上组成。 并且所述钢板中的所述组分满足下列表达式(C)和(D)。 由以下表达式(B)定义; 其中,当所述成分的Ti(%) - 3.43×N(%)的值为所述的(Ti(%) - 3.43×N(%)) 表达式(A)为负,该值被视为零,Mneq。 = Mn(%) - 0.29×Si(%)+ 6.24×C(%)...(B),950 <=(Mneq ./(C(%) - (Si(%)/ 75) )×贝氏体面积百分比(%)...(C),C(%)+(Si(%)/ 20)+(Mn(%)/ 18)<5> 0.30 ...(D)。