A.白口鑄鐵B.麻口鑄鐵C.灰口鑄鐵D.球墨鑄鐵
A.0.1~0.25% B.0.27~0.50% C.0.6~0.9% D.0.7~1.5%
A.0.02mm B.0.04mm C.0.01mm D.0.015mm