mild carbon steel pipe 1.thickness:2-35mm 2.outer diameter:18-406mm 3. ... ; Grade: 10#, 20#, 45#, 16Mn; Application: Structure Pipe,Fluid pipe, low /mid pressure boiler pipe NameMild carbon seamless steel pipeSize rangeOutside diameter: 1 ... are according to the ISO9001:2000 strictly Mild Carbon Steel Pipe