Stainless steel round bar 1.Size: 20mm to 1000mm 2.Length: follow by the ... CLASS 3 or SEP 1921 C/C ,D/d.round steel bar AISI4130,S355J2G3,C45,42CrMo4,AISI 4140,AISI 4340,8620,18CrNiMo7 ... steel20#-60#ball bearing steelGCr15 GCr16 GCr9 GCr15SiMn Stainless steel round bar