A.0.65×(18/12)2 B.0.70×18/12 C.0.70×(18/12)2
A.18(0.80/1.5)1/2 B.18(0.70/1.5)1/2 C.18(700/1.5)1/2
A.密排輥列 B.壓縮鑄造 C.輕壓下技術(shù)