Carbon Steel Pipe with High Quality 1.WT:4-70mm OD:25-370mm ... Stainless Steel 4-426×1-40 Structural Pipe 10,20,35,45,Q23516Mn Q345BGB/T8162-2008--for the ... 1.53-40 Low and medium pressure boiler tube 10,20GB3087-1999- for Low and Medium Pressure Boiler ... T13295-2003 ISO2531/2003- Public works, mining, textile, electric power, boilers, drinking water, machinery, military industryDN80-1500-square ...