High carbon steel 45 # yog siv rau kev sib tw laum khoom rau cov ntoo mos, ntoo tawv, thiab cov hlau mos, thaum GCr15 bearing steel yog siv rau cov ntoo mos rau hlau.4241 # high-speed steel yog tsim rau cov hlau mos, hlau, thiab cov hlau zoo tib yam, 4341 # high-speed steel yog tsim rau cov hlau mos, hlau, i ...
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