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    • 4. 发明申请
    • STEEL WIRE MATERIAL FOR SPRING AND ITS PRODUCING METHOD
    • 用于弹簧的钢丝材料及其生产方法
    • US20090020189A1
    • 2009-01-22
    • US12171807
    • 2008-07-11
    • Nao YOSHIHARAFujio KoizumiHirokazu InoueKatsuya TakaokaShoji MiyazakiSayaka Nagamatsu
    • Nao YOSHIHARAFujio KoizumiHirokazu InoueKatsuya TakaokaShoji MiyazakiSayaka Nagamatsu
    • C21D11/00C22C38/20C22C38/42C22C38/34C22C38/02C21D9/02
    • C22C38/02C21D8/06C22C38/04C22C38/06C22C38/20C22C38/28C22C38/42C22C38/46C22C38/50Y10T428/12958
    • The steel wire material for a spring of the invention contains; C: 0.37-0.54%, Si: 1.7-2.30%, Mn: 0.1-1.30%, Cr: 0.15-1.1%, Cu: 0.15-0.6%, Ti: 0.010-0.1%, Al: 0.003-0.05%, and the balance including iron with inevitable impurities, wherein ferrite decarburized layer depth is 0.01 mm or less, whole decarburized layer depth is 0.20 mm or less, and fracture reduction of area is 25% or more. It alternately may contain; C: 0.38-0.47%, Si: 1.9-2.5%, Mn: 0.6-1.3%, Ti: 0.05-0.15%, Al: 0.003-0.1%, and the balance including iron with inevitable impurities, wherein ferrite decarburized layer depth is 0.01 mm or less, Ceq1 in the equation (1) below is 0.580 or more, Ceq2 in the equation (2) below is 0.49 or less, and Ceq3 in the equation (3) below is 0.570 or less. Ceq1=[C]+0.11[Si]−0.07[Mn]−0.05[Ni]+0.02[Cr]  (1) Ceq2=[C]+0.30[Cr]−0.15[Ni]−0.70[Cu]  (2) Ceq3=[C]−0.04[Si]+0.24[Mn]+0.10[Ni]+0.20[Cr]−0.89[Ti]−1.92[Nb]  (3) (In the above equations, [ ] shows the content (mass %) of each element in steel.)
    • 本发明的弹簧钢丝材料包含: C:0.37-0.54%,Si:1.7-2.30%,Mn:0.1-1.30%,Cr:0.15-1.1%,Cu:0.15-0.6%,Ti:0.010-0.1%,Al:0.003-0.05% 余量包括铁与不可避免的杂质,其中铁素体脱碳层深度为0.01mm以下,整个脱碳层深度为0.20mm以下,面积的断裂减少为25%以上。 它可以包含; C:0.38-0.47%,Si:1.9-2.5%,Mn:0.6-1.3%,Ti:0.05-0.15%,Al:0.003-0.1%,余量包括铁与不可避免的杂质,其中铁素体脱碳层深度为 0.01以下时,式(1)中的Ceq1为0.580以上,式(2)中的Ceq2为0.49以下,下述式(3)中的Ceq3为0.570以下。 Ceq1 = [C] +0.11 [Si] -0.07 [Mn] -0.05 [Ni] +0.02 [Cr](1)在线式公式描述=“In-line formula”end =“lead” <?in-line-formula description =“In-line Formulas”end =“tail”?> <?in-line-formula description =“In-line Formulas”end =“lead”?> Ceq2 = [C] + 0.30 [Cr] -0.15 [Ni] -0.70 [Cu](2)<?in-line-formula description =“In-line Formulas”end =“tail”?> <?in-line-formula description =“In Ceq3 = [C] -0.04 [Si] +0.24 [Mn] +0.10 [Ni] +0.20 [Cr] -0.89 [Ti] -1.92 [Nb](3) ?in-line-formula description =“In-line Formulas”end =“tail”?>(在上式中,[]表示钢中各元素的含量(质量%))