Types of seamless steel pipes

National standard seamless steel pipe is a type of steel pipe made from steel ingots or solid billets through perforation, hot rolling or cold rolling processes. Its English name is National standard seamless steel pipe, and it plays an important role in the domestic steel pipe industry. According to the process, it can be divided into two categories: hot-rolled and cold-rolled. Hot rolled steel pipes include general purpose pipes, boiler pipes, petroleum cracking pipes, and other varieties, while cold-rolled steel pipes include subdivided types such as carbon thin-walled pipes and special-shaped pipes. The specifications of steel pipes are expressed in millimeters (outer diameter x wall thickness), and the mass calculation is based on the formula (outer diameter x wall thickness) x wall thickness x 0.02466=kg/meter. This product complies with multiple national standards such as GB/T8162 and GB3087, covering application fields such as structural pipes, fluid transport pipes, and high-pressure boiler pipes. The production process includes heating of the tube blank, piercing with conical rollers, three roll oblique rolling, sizing cooling, and non-destructive testing.