... /d 3.Diameter: 50-500mm 1.2738 Grade: 718, 718H(ASSAB), PX5\PX4, 3Cr2NiMo, P20+Ni, 1.2738Characteristic:1.1.2738: Pre-hard ... plastic mold steel.2.1.2738: Excellent polishing, electrolytic corrosion, ... HB290-330 afer hardening and tempering process.Chemical composition of 1.2738: Elements CSiMnMoCrNiStandardContent(%) 0.30~0.400.20~ ...