黄铜 C28000 C34500 C34700
钨钢 YG15 YG20 ..
钨钢 YL10.2 YG3..
钨钢 YG3X YG6X ..
黄铜 C24000 C2..
黄铜 C37800 C3..
黄铜 C34900 C3..