Specification 1.Cobalt molybdenum high speed steel . 2.High hardness and superior hot hardness. 3.Excellent cutting preformance. 4.Offers excellent wear resistance. Application Chemical composition Name C Si Mn P S Cr V M42 1.05-1.15 Â?¤0.65 0.15-0.40 Â?¤0.30 Â?¤0.30 3.50-4.50 0.95-1.35 Similar grade Gb Aisi/astm Din Jis W2mo9cr4co8 M42 1.3247 Skh59 Physical properties Metric Imperial Density 8.16 g/cm3 0.294 lb/in3 Melting point 4680â°c 2600â°f Heat treatment M2 tool steels are pre-heated prior to hardening at 2610â°c (4730â°f) followed by rapid heating from 2610â°c (4730â°f) to 3960â°c (7160â°f). These steels are then cooled for 3 to 5 min and quenched in air, salt bath or oil. -