Structural seamless steel pipe GB/T8162-2018 is mainly used for general structure and machining. Its representative materials (brands): carbon steel 20#, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
Structural stainless steel seamless pipe (GB/T14975-2002) is a hot-rolled (extruded, Expanded) and cold drawn (rolled) seamless tubes.
Calculation method of structural steel pipe: (outer diameter-wall thickness)*wall thickness*0.02466=weight per meter of steel pipe,
