45钢成分及含量

碳：0.42%-0.50% 锰：0.90%-1.20% 硅：0.17%-0.37% 硫：≤0.035% 磷：≤0.035% 铬：≤0.25% 镍：≤0.25% 钼：≤0.15% 钒：≤0.15% 钛：≤0.10% 硼：≤0.005%