... mole with wearproof. M2 high speed steel round bar (1.3343 )1.Chemical composition: C:0.85, Si:0.38, Mn ... , Cr:4.10, W:6.00, Mo:4.80, V:1.852.Annealed Hardness:255, Hardening:1210~1230 , Tempering 550, ... mole with wearproof. M2 high speed steel round bar (1.3343 )1.Chemical composition: C:0.85, Si:0.38, Mn ... , Cr:4.10, W:6.00, Mo:4.80, V:1.852.Annealed Hardness:255, Hardening:1210~1230 , Tempering 550, ...