According to different production methods, manufacturing methods can be divided into hot-rolled tubes, cold-rolled tubes, cold-drawn tubes, and extruded tubes.

Encapsulate high-density high-pressure polyethylene raw materials on the outer surface of seamless pipes, which have very high impact toughness and high-quality corrosion resistance, and can protect them from external factors during the entire process of transportation, installation and application. The destruction caused by the element.

Thermally expanded seamless steel pipes are widely used in aerospace, chemical plants, engineering construction, food, industrial control systems, pharmaceuticals, nuclear power plants, gas development, design, production, manufacturing, transportation, and deep-sea surveys.

The remaining stress will inevitably occur in the welding seam during the forming and welding process, so the remaining stress should be eliminated after the tube blank is formed and welded. Diameter expansion can eliminate the remaining stress, but it is difficult to completely eliminate the remaining stress, and it is impossible to eliminate the remaining stress at the weld toe.

Look at the manufacturing process of seamless steel pipes, you will know why seamless steel pipes have no seams.

ASTM A53 Gr.B and ASTM A106 Gr.B