... die steel as requirements. High quality with competiti special steel square barsSpecification:Precisely-forged square bar 20mm -150mmHot-rolled square bar 9.5mm*9.5mm ... , Mn 0.30, P≤0.028, S≤0.020, Cr 5.10, W ≤0.30,Mo 1.35, V 0.90Annealed ... )4. W6Mo5Cr4V2 (GB), it is similar to M2( ASTM), S6-5-2(DIN), SKH51(JIS)Chemical Composition: C 0.85, Si ...