... mole with wearproof. M2 high speed steel round bar (1.3343 )1.Chemical composition: C:0.85, Si:0.38, Mn:0.35, P≤0.030, S≤0 ... .030, Cr:4.10 ... high speed steel round bar (1.3343 )1.Chemical composition: C:0.85, Si:0.38, Mn:0.35, P≤0.030, S≤0.030, Cr:4.10 ...