Seamless Steel Pipe Introduction
Seamless steel pipe is a round, square, rectangular steel with a hollow cross-section and no seams around the perimeter. Seamless steel pipe is made from ingots or solid billets that are perforated to form a burr tube and then hot rolled, cold rolled or cold punched. Seamless steel pipe is used in large quantities as a pipeline for transporting fluids. Compared with solid steel such as round steel, steel pipe is lighter in weight when it has the same bending and torsional strength, and is an economic cross-sectional steel, which is widely used in the manufacture of structural and mechanical parts.
The use and classification of seamless steel pipe
Application: Seamless steel pipe is a kind of economic section steel, which has a very important position in national economy and is widely used in various sectors such as petroleum, chemical industry, boiler, power station, shipbuilding, machinery manufacturing, automobile, aviation, aerospace, energy, geology, construction and military industry.
Classification.
① according to the section shape: round section tube, shaped section tube
② according to material: carbon steel pipe, alloy steel pipe, stainless steel pipe, composite tube
③ according to the connection: threaded connection tube, welded tube
④ according to the production method: hot-rolled (extrusion, top, expansion) tube, cold-rolled (drawing) tube
⑤ according to the use of: boiler tube, oil well pipe, pipeline pipe, structural pipe, fertilizer pipe
Production process of seamless steel pipe
① Main production processes (main inspection processes) for hot rolled seamless steel pipes
Pipe billet preparation and inspection → pipe billet heating → piercing → rolling → barren pipe reheating → fixing (reducing) diameter → heat treatment → finished pipe straightening → finishing → inspection (non-destructive, physical and chemical, stage inspection) → storage
②Main production process of cold rolled (drawn) seamless steel pipe
Billet preparation → pickling lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection
