1)carbon steel round bar 2)standards :GB,JIS,ASTM and so on ... :27SiMn,60Si2Mn,5CrMnMo,etc 4)diameter:3.5-450mm 1)carbon steel round bar2)standards :GB,JIS,ASTM and so on 3 ... ,60Si2Mn,5CrMnMo,etc4)diameter:3.5-450mm5)best exporter TypeRound steel barStandardGB/ASTM/DIN/JIS and so onGrade27SiMn,60Si2Mn,5CrMnMo,etcDiameter3 ...