Mild steel carbon round bar 1.Factory direct price 2.Garde:Q235,SS400, ... ,etc. 3.Free sample&small order is ok Mild steel carbon round bar specificationOuter Diameter:3.5mm-300mmStandardGB,JIS,DIN,AISI ... ,Q345B,S355JR,etc.ApplicationA) General service industries (petroleum, food, chemical, paper, fertilizer, Fabric, aviation and nuclear)B) Fluid, gas and oil ...