... 20 years of production experiences 2.Black or machined surface Cold Work Tool Steel Cr12,D3, SKD1 ,1.2080Characteristics: ... wear resistance, it is widely used in making cold die and punch, cold shearing ,drilling bushing ,gauge, wortle, coining die ... , Salt bath 220-250 Centigradeor 500-550 Centigrade, air or compressed air.Quenching hardness: 63-65 HRCChemical Composition: elementCSiMnCrSPcontent2.10≤ ...