Spiral-welded steel pipes are钢管 formed by bending and deforming steel strips or plates into circular, square, or other shapes and then welded together, featuring a seam on the surface. They can be categorized by welding methods into arc-welded pipes, high-frequency or low-frequency resistance-welded pipes, gas-welded pipes, furnace-welded pipes, and Bondi pipes, among others. Based on the seam shape, they are divided into straight seam welded pipes and spiral seam welded pipes. Arc-welded pipes are used in the oil and gas drilling industry and mechanical manufacturing. Furnace-welded pipes can be used for water and coal gas pipelines, while large-diameter straight seam welded pipes are suitable for high-pressure oil and gas transportation. Spiral seam welded pipes are used for oil and gas transportation, pipe piles, bridge piers, etc. Welded steel pipes are more cost-effective and have higher production efficiency than seamless steel pipes.