What is Seamless Steel Pipe?

1. What is a seamless steel pipe

Seamless steel pipe is a round, square, and rectangular steel with a hollow section and no joints on the periphery. Seamless steel pipes are made of steel ingots or solid tube billets through perforation to make capillary tubes and then made by hot rolling, cold rolling, or cold drawing. Seamless steel pipes have a hollow section and are used in large quantities as pipes for conveying fluids. Compared with solid steel such as round steel, steel pipes have the same bending and torsion strength and lighter weight. They are economical cross-section steels and are widely used in manufacturing structures. Parts and mechanical parts, such as steel scaffolding for oil drills, etc.

2. Use of seamless steel pipe

Uses: Seamless steel pipe is a kind of economic section steel, which has a very important position in the national economy. It is widely used in petroleum, chemical industry, boilers, power stations, ships, machinery manufacturing, automobiles, aviation, aerospace, energy, geology, construction, and Various departments such as the military industry.

Seamless Steel Pipe

3. Classification of seamless steel pipes

A. According to the shape of the section: circular section tube, special-shaped section tube

B. According to the material: carbon steel pipe, alloy steel pipe, stainless steel pipe, composite pipe

C. According to the connection mode: threaded connection pipe, welded pipe

D. According to the production method: hot rolled (extruded, topped, expanded) tube, cold rolled (drawn) tube

E. According to purpose: boiler pipe, oil well pipe, line pipe, structural pipe, fertilizer pipe...

4. Production process of seamless steel pipe

A. Main production process of hot rolled seamless steel pipe (main inspection process):

Tube billet preparation and inspection → tube billet heating → perforation → tube rolling → waste tube reheating → fixed (reduced) diameter → heat treatment → finished tube straightening → finishing → inspection (non-destructive, physical and chemical, bench inspection) → storage

B. Main production process of cold rolled (drawn) seamless steel pipe

Blank preparation → pickling and lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection

Botop is the international export seamless steel pipe manufacturer, please contact us if you need more details.