A.強(qiáng)度、硬度高 B.強(qiáng)度、硬度低 C.強(qiáng)度高、硬度低
A.>0.25% B.0.25%~0.6% C.>0.77%
A.S≤0.035%,P≤0.045% B.S≤0.035%,P≤0.035% C.S≤0.025%,P≤0.035%