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40crmnnimo8-6-4
化學成分：????? C?????????? SI????????????Mn??????????? P?????????????? S???????????? Cr Mo??????????? Ni
??? Min???‰???? 0.35?????? 0.20??????? 1.30?????????????????????????????????????????????1.80?????? 0.15???????? 0.90 ??? Max? ‰????? 0.45????? 0.40???????? 1.60??????? 0.030??????? 0.030??????? 2.10?????? 0.25???????? 1.20
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