Steel Pipe Product Introduction Seamless steel pipes are widely used. General-purpose seamless steel pipes are rolled from ordinary carbon structural steel, low-alloy structural steel or alloy structural steel, with the largest output, and are mainly used as pipelines or structural parts for conveying fluids. Product Detail Welding Line Type: Seamless Outer Diameter: 30mm Tolerance: ±1% Processing Service: Bending, Welding, Decoiling, Punching, Cutting, Moulding Grade: 200/300/400 Series Section Shape: Round Type: Round steel tube