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

Selection of seamless pipe welding method

astm a106 grade b seamless pipe