Gas pipe 1.Outer diameters:21-219mm 2.Wall thickness:1-22mm 3.Material: 10#/20#/45# 4.Surface: Oiled or black painted ... DIN1629,DIN17175,API5LandJIS,ENstandard.our main material is 10#,20#,45#,16MN, 37Mn5,ST45.8,ST35.8,ST37.So far,we ... .04-0.70≤0.030≤0.250.70-1.100.45-0.65440-590≥290≥2010CrMo9100.08-0.15≤0.500 ...