... round bar: Diamet hss and die steel round bar Cr12Mo1V1/D2/1.2379Hot rolling round bar: Diameter 8mm---32mmPrecisely-forged round bar ... GB), it is similar to M2( ASTM), S6-5-2(DIN), SKH51(JIS)Chemical Composition: C 0.85, Si ... GB), it is similar to M2( ASTM), S6-5-2(DIN), SKH51(JIS)Chemical Composition: C 0.85, Si ... GB), it is similar to M2( ASTM), S6-5-2(DIN), SKH51(JIS)Chemical Composition: C 0.85, Si ...