Thick-walled welded steel pipes refer to pipes with a wall thickness of over 10mm, known as thick-walled welded pipes. Thick-walled welded steel pipes can be categorized into spiral thick-walled welded pipes and straight seam thick-walled welded pipes based on their production process and weld types.

Spiral-welded steel pipes are produced using double-sided submerged arc welding technology. Seamless thick-walled steel pipes include double-sided submerged arc welding seamless pipes and high-frequency welded pipes. The main difference between the two is the production diameter and the presence of welding wire. The theoretical weight calculation formula for thick-walled welding pipes is carbon steel: [(outer diameter - wall thickness) * wall thickness] * 0.02466 = kg/meter (weight per meter), alloy: 0.02483, stainless steel: 0.02491. Thick-walled welding pipes, due to their thicker walls, have stronger compressive strength and are suitable for load-bearing, supporting, and bridge pipes, as well as for buried pipeline transportation.