... B16,F11,F12,F22,F5,F9,51Cr4. Carbon steel bar:Chinese Standard:20#,25#,35#,45#,50#,60#; ... 2, thin ≤2.5 NameRound bar BrandTISCO,BAOSTEEL,CGXYSTEELMaterial GradeStainless steel, Alloy steel, Carbon steel. StandardANSI/ASTM/SUS/GB/DIN/EN ... .0-2.0+2.5-2.5Hot-rolled flat bar: Width(mm)Thickness(mm)SizeSize toleranceSizeSize toleranceNormalBetterNormalBetter10-50 ... -2.0%+0.8%, -1.8% 2013 High Quality Round bar