The seamless steel tube
is a long strip of steel with a hollow section and no seams around it. The seamless steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. Seamless steel pipe plays an important role in China's steel pipe industry. Seamless steel pipes are widely used in water and gas pipelines, and are also used in petroleum, chemical, boiler, automobile, tractor, aviation and other fields.
According to the different production methods, seamless steel tubes are divided into hot-rolled (extruded, expanded) seamless tubes and cold drawn (tanned) seamless tubes
. According to the material can be divided into: ordinary and high-quality carbon structural steel (Q215-A ~ Q275-A and 10 ~ 50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless acid-resistant steel. According to the use, it can be divided into two types: general purpose (for water, gas pipelines and structural parts, mechanical parts) and special (for boilers, geological exploration, bearings, acid resistance, etc.).
Structural seamless steel pipe is a pipe with a hollow section and is used as a large amount of conveying fluid, such as pipes for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, the steel pipe has a lighter weight when it has the same bending and torsional strength, and is an economical section steel. Widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automotive drive shafts, bicycle frames and steel scaffolding used in construction, such as steel scaffolding, to create ring-shaped parts, which can improve material utilization, simplify manufacturing processes, save materials and processing. Working hours, it has been widely used in steel pipes.