55CrSi弹簧钢热轧线材冷拔抗拉强度的计算

Calculation of Tensile Strength of 55CrSi Spring Steel Hot rolled Wire Rod after being Cold drawn

根据５－５ ｍｍ 、１４ ｍｍ 和１５ ｍｍ ３ 种规格的５５ＣｒＳｉ 热轧线材经酸洗、磷化、烘干后直接拉拔的实测抗拉强度数据，经过数据处理，推导出５５ＣｒＳｉ 热轧线材冷拔抗拉强度计算公式为：σｂ ＝ σｂ０ ＋ ５５ ＋ ４－７６ Ｑ＋ １００－ Ｑ２ｅＱ－ ７１５ ，此时最大相对误差为５－７％ ；当Ｑ≤７０ ％ 时，上述公式可简化为σｂ ＝ σｂ０ ＋ ５５ ＋ ４－７６ Ｑ，此时最大相对误差为３－７％ 。

According to the tensile strength data of three specifications 5 5?mm,14?mm and 15?mm 55CrSi hot rolled wire rod measured after being drawn directly through pickling,phosphorizing and drying,the calculation formula σ b= σ b0 +55+ 4 76 Q+ 100-Q2 e Q-715 for tensile strength of 55CrSi hot rolled wire rod after being cold drawn is deduced through a large amount of complex data treatment,and the maximum relative error at this time is 5 7% When Q ≤70%,above mentioned formula can be simplified into σ b= σ b0 +55+4 76 Q ,and the maximum relative error at this time is 3 7%。