化学成份:
C: 0.67~0.75%Si: 0.17~0.37%Mn: 0.5~0.8%S: ≤0.035%P: ≤0.035%
Cr: ≤0.025%Ni: ≤0.3%Cu: ≤0.025%
抗拉强度:
钢丝直径允许偏差: