Steel pipe is a long, hollow-section steel pipe made of steel. It is primarily used for conveying fluids, gases, and powdered solids, and for manufacturing mechanical parts, containers, and building structures. It can be categorized into seamless and welded steel pipes based on the production process, and further subdivided into high-pressure boiler pipes, oil pipes, precision pipes, stainless steel pipes, galvanized pipes, and other types based on application and performance requirements.