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mould steel 4Cr13 round bar Tool Steel GB DIN ASTM JIS SS Plastic tool steel 3Cr2Mo 1.2311 P20 - 618 3Cr2NiMo 1.2738 P20+Ni - 718 42CrMo 1.7225 4140 SCM440 - 4Cr13 1.2083 420 - S136 3Cr17Mo 1.2316 - ...