不能替代,机械性能、硬度都到不到45#的要求。
45#
化学成分(%)0.42-0.50C,0.17-0.37Si,0.50-0.80Mn,0.035P,0.035S,0.25Ni,0.25Cr,0.25Cu
抗拉强度:不小于600Mpa屈服强度:不小于355Mpa
伸长率:16%
收缩率:40%
冲击功:39J
Q345B
C≤0.20,Mn
≤1.70,Si≤0.50,P≤0.035,S≤0.035;
屈服强度:≤16mm:大于345,16-40mm:大于335,40-63mm:大于325,63—80mm:大于315,
80—100m:大于305,100—150mm:大于285,150—200mm:大于275。
抗拉强度:450—630。
伸长率:大于17。
冲击试验:试验温度:20℃:大于34。