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随着汽车制造业的迅速发展,汽车板簧用量日益增加,汽车用板簧已从平扁弹簧,发展为异型截面板簧和变断面板簧(即锥形簧)。这种变断面板簧,中间部分厚度达20～40mm,对材质各项性能要求较高,尤其是要求弹簧用钢有较高的淬透性。目前各国板簧用钢都是中高碳的Si-Mn系钢和Cr-Mn系钢。为了提高板簧用钢的淬透性以制造截面较大的板簧,发展使用了Cr-Mn-B系钢和Si-Mn-V-B系钢。目前国内90％以上的板簧都是由60Si2Mn钢
With the rapid development of automobile manufacturing industry, the amount of automobile leaf spring is increasing day by day. Automobile leaf springs have been developed from flat spring to deformed spring and variable spring (ie conical springs). This variable break spring, the middle part of the thickness of 20 ~ 40mm, high performance requirements of the material, in particular, requires a higher spring steel hardenability. At present, the spring steel of all countries is high-carbon Si-Mn steel and Cr-Mn steel. In order to increase the hardenability of leaf spring steel to produce a leaf spring having a large cross section, Cr-Mn-B based steels and Si-Mn-V-B based steels have been developed. At present, more than 90% of the domestic spring are made of 60Si2Mn steel