ASTM 304 Stainless steel round bar .we professionally machining and prroduce forged heavy forgings for machinery,chemistry and ... Classification Society".5,we usualy use material of steel type of 15#,20#,25#,30#.35#,40#, ... different requirements.6,main material are 5CrMnMo,40Cr,42CrMo,20Cr2Ni4,5CrNiMo,15CrNiMo,20CrNiMo,35CrMo,40CrNiMo,etc.7, ... excellent heat treatment. ASTM 304 Stainless steel round bar