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圆钢20Gr1Mo1VNbTiB棒料2Cr12NiM01W1V材料2Gr12NiMO1W1V钢材圆棒
20GrMnMoA钢材42Gr2MoV棒料41CrM04材料41Gr4圆棒20Gr1Mo1VNbTiB