EN10255 standard tube sizes 200mm iron pipe S355j0h carbon steel erw welded ms round pipe Material Carbon Steel Size OD 21-273MM. THICKNESS 1.0-10.0MM. LENGTH 5.5-6.5M. Grade Q195 = S195 / A53 Grade A Q235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST42.2 Q355 = S355JR / A500 Grade B Grade C Standard EN39, BS1139, BS1387 high quality ERW Carbon Steel Welded Pipe from China Seamless Galvanized Steel Pipe, ERW SSAW Steel Pipe, Anti high quality ERW Carbon Steel Welded Pipe from ChinaEstablished in 2010, ERW SSAW steel pipe , galvanized steel pipe , square & rectangular steel pipe , anti-corrosion pipe are our main product. Our company annual output is more than 600 thousand tons and the products have passed the ISO9001.