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DRAWN HEAT TREATED STEEL WIRE FOR HIGH STRENGTH SPRING USE AND PRE-DRAWN STEEL WIRE FOR HIGH STRENGTH SPRING USE
DRAWN HEAT TREATED STEEL WIRE FOR HIGH STRENGTH SPRING USE AND PRE-DRAWN STEEL WIRE FOR HIGH STRENGTH SPRING USE
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机译:高强度弹簧用拉丝热处理钢丝,高强度弹簧用拉丝钢丝
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摘要
Drawn heat treated steel wire for high strength spring use is provided containing, by mass %, C: 0.67% to less than 0.9%, Si: 2.0 to 3.5%, Mn: 0.5 to 1.2%, Cr: 1.3 to 2.5%, N: 0.003 to 0.007%, and Al: 0.0005% to 0.003%, having Si and Cr satisfying the following formula:; 0.3%≦Si−Cr≦1.2%,;and having a balance of iron and unavoidable impurities, having as impurities, P: 0.025% or less and S: 0.025% or less, furthermore having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm, further having, as a metal structure, at least residual austenite in a volume rate of over 6% to 15%, having a prior austenite grain size number of #10 or more, and having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm.
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机译:提供用于高强度弹簧的拉制热处理钢丝,以质量%计,其C:0.67%至小于0.9%,Si:2.0至3.5%,Mn:0.5至1.2%,Cr:1.3至2.5%,N Si:Cr:0.003〜0.007%,Al:0.0005〜0.003%:满足下式: <?in-line-formulae description =“在线表达式” end =“ lead”?> 0.3%≦Si-Cr≤1.2%,<?in-line-formulae description =“在线表达式” end =“尾巴;且具有铁和不可避免的杂质的余量,具有作为杂质的P:0.025%以下和S:0.025%以下,并且还具有小于0.2μm的未溶解球形碳化物的圆当量直径,并且作为金属组织,至少有残留奥氏体的体积率超过6%至15%,先前的奥氏体晶粒度数为#10或更大,并且未溶解的球形碳化物的圆当量直径小于0.2微米
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