... 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 ... ,HRB400,GR40,GR60,460A/B,SD345,SD390,SD500Dia:10-40mm hot rolled alloy round steel bar