A.珠光體類型鋼 B.馬氏體類型鋼 C.鐵素體類型鋼 D.萊氏體類型鋼
A.5%以下 B.5%-8% C.9%-10% D.11%以上
A.0.3%-0.7% B.0.7%-1% C.1%-3% D.4%-5%