... steel,alloy steel,bearing steel,spring steel,etc round steel bar Standard: GB,JIS,DIN,ASTM,BSProductsGradeSizeCarbon steel10#-70#,S20C-S70C ... ,SUP10,55Cr3,50CrV4,SAE6150Dia:12-130mmRebarHRB335,HRB400,GR40,GR60,460A/B,SD345,SD390,SD500Dia:10-40mm