A.耐熱鋼 B.軸承鋼 C.彈簧鋼 D.不銹鋼
A.2Cr13 B.1Cr18Ni9Ti C.W18Cr4V D.HT200
A.2Cr13 B.1Cr13 C.1Cr18Ni9Ti D.W18Cr4V