Spiral welded steel pipes stand as indispensable assets within the water supply infrastructure domain, serving as robust conduits for transporting essential liquids.

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This guide is designed to provide buyers with the knowledge they need to purchase straight seam welded pipe.

Defects that are prone to occur in the welding area of spiral steel pipes include pores, hot cracks, and undercuts.

At present, the radiographic inspection technology of steel pipe welds can be roughly divided into: X-ray film imaging and digital imaging.

Anti-corrosion steel pipes are metal bodies buried underground. In order to extend their service life, anti-corrosion layers are usually provided on the outside of steel pipes and lead-plated aluminum cables. As anti-corrosion coatings for steel pipes, various insulating asphalts, coal char paints, epoxy asphalt, polyethylene, etc. can be used.

Spiral pipes are also called spiral steel pipes or spiral welded pipes. They are made by rolling low carbon structural steel or low alloy structural steel strips into pipe blanks at a certain spiral angle (called forming angle), and then welding the pipe seams. , which can produce large-diameter steel pipes from narrower strips.

Generally, welded pipes are used to transport low-pressure fluids. It is made of Q195A, Q215A and Q235A steel. It can also be made from other mild steels that are easily weldable.

Common anti-corrosion processes for Anti-corrosion steel pipes refer to steel pipes that have been treated with anti-corrosion processes, which can effectively prevent or slow down corrosion caused by chemical or electrochemical reactions during transportation and use.

Generally speaking, the diameter of spiral steel pipe can be divided into outer diameter, inner diameter and nominal diameter. The outer diameter of a spiral steel pipe is represented by the letter D, followed by the outer diameter size and wall thickness. For example, a seamless steel pipe with an outer diameter of 108 and a wall thickness of 5MM is represented by D108*5.