the round steel bar can be used to make mould,cutting tools,and so on. SpecificationsHot-rolled Round barH13, M2, W9, W4. ... ≤0.030, Cr 7.10, W ≤0.50,Mo 2.10, V 1.80Annealed Hardness: HB≤255Heat treatment temp: ... W6Mo5Cr4V2 ,it is similar to M2( ASTM), S6-5-2(DIN), SKH51(JIS)Chemical Composition: C 0.85, Si 0 ... 0.030, Cr 4.05, W 8.90, Mo 2.90 V 1.45Annealed Hardness: HB≤255Heat treatment temp: Hardening ...