round steel bar Standard: GB,JIS,DIN,ASTM,BS carbon steel,alloy steel,bearing steel,spring steel,etc round steel bar Standard: GB,JIS,DIN,ASTM,BSProductsGradeSizeCarbon steel10#-70#,S20C-S70C,C22-C70,SS400Dia:12-300mmAlloy steel40Cr,42CrMo,SAE4140,SAE5140,etcDia:12-300mmBearing steelGCr15,SUJ2,,100Cr6,SAE52100,etcDia:12-300mmSpring steel65Mn,SAE1566,SUP7,SUP9,SUP10,55Cr3,50CrV4,SAE6150Dia:12- ...