Tube Rolling

Tube Rolling

 

the production of seamless metal pipe and tubing by rolling on special mills, called tube-rolling units. Seamless pipe and tubing—by which is meant products without longitudinal or spiral welded seams—is widely used in the manufacture of automobiles, tractors, aircraft, and boilers. It is also used in various other branches of the machine-building industry, in petroleum extraction, in the chemical industry, and in public works. Tube rolling includes the production of both hot-rolled pipe and cold-rolled pipe, which is first hot-rolled and then cold-rolled.

The tube-rolling process uses a wide range of rolling mills, which differ in the method of rolling and the size and type of pipes produced. Hot-rolled pipe with an outside diameter of 25–700 mm and a wall thickness of 2.5–75 mm and cold-rolled pipe with an outside diameter of 8–450 mm and a wall thickness of 0.08–20 mm are available. The type of tube-rolling equipment and its location in the shop depend on the method of production, the operating conditions, and the required pipe specifications.

Tube rolling usually consists of two main operations and several auxiliary operations. The first operation, piercing, consists in the formation of a longitudinal opening in a round bar or billet, forming a thick-walled pipe called a shell. In the second operation, plug rolling, the pierced bar or billet is elongated and its wall thickness is decreased to the approximate dimensions required for the finished pipe. Both operations are performed in one heating. The first operation is performed on piercing mills by rotary rolling between barrel-shaped or mushroom-shaped rolls on a short mandrel. The second operation is performed on continuous, short-mandrel, Pilger, or three-high thread-rolling mills. After plug rolling, the pipe is sized in special sizing mills and is then cooled, straightened, and inspected. Pipe and tubing less than 70 mm in diameter undergo additional hot-rolling on a reducing mill (seeREDUCING).

After hot-rolling, the pipe is cold-rolled on special longitudinal intermittent-acting mills and is also cold-drawn. These operations are intended to decrease its diameter and wall thickness, to improve its mechanical properties, and to obtain a smooth surface and exact dimensions.

Contemporary tube rolling is characterized by high labor productivity, by automation and mechanization of most basic and auxiliary technical operations, and by the availability of a wide range of high-quality rolled pipe and tubing. Since 1968 the USSR has been the leader in world production of seamless pipe and tubing; in 1975, its production was 16 million tons.

REFERENCES

Prokatnoeproizvodstvo: Spravochnik, vols. 1–2. Moscow, 1962.
Danilov, F. A., A. A. Gleiberg, and V. G. Balakin. Goriachaiapro-katka ipressovanie trub, 3rd ed. Moscow, 1972.

A. I. TSELIKOV

References in periodicals archive ?
Tenders are invited for Supply of Rollers For Liner Tube Rolling Expander
The tube rolling capacity is about 120,000 tonnes annually and the ring rolling capacity about 45,000 tonnes a year.
The working procedure of seamless steel pipe consists of piercing, tube rolling, and tube reducing.
One of the largest Russian pipe producers, ChTPZ group, has announced that on July 23 this year it commissioned its new pipe electric-welding workshop named Vysota 239 for the production of large diameter single-seam pipes at its subsidiary Chelyabinsk Tube Rolling Plant (ChTPZ).
The site of the new mill is within the grounds of the company's largest existing mill in Dnepropetrovsk, the Niznedneprovsky Tube Rolling Plant (NTRP).
This new mill, in Pervouralsk, Sverdlovsk region, said an EBRD memorandum, would help the CHTPZ Group "achieve vertical integration in seamless pipe segment, making it almost self-sufficient in billets for seamless pipe production." The new mill would replace the group's outdated open hearth furnaces at its Chelyabinsk tube rolling plant.
The European Bank for Reconstruction and Development (EBRD) is lending Chelyabinsk Tube Rolling Plant $190 million to finance the acquisition of a 57.22% stake in another Russian pipe plant.
The EBRD said on December 29 that it was also lending Chelyabinsk Tube Rolling Plant $190 million to finance the acquisition of a 57.22% stake in another Russian pipe plant.
The steam engine instructors spoke about boiler construction, conditioning, safety, steam guage repair, boiler piping, steam cylinder oiling, steam injectors, steam governors, valve repair, tube rolling and water chemistry.
Tenders are invited for Lead fuse tube rolling machine as per drg.
If EU ministers agree, new duties would levy 29.8% on all Croatian producers; 17.8% on Romanian producers (except SC Mittal Steel Roman--17.7%, and SC Silcotub--11.7%); 35.8% on Russian exporters, except Joint Stock Company Chelyabinsk Tube Rolling Plant and Joint Stock Company Pervouralsky Novotrubny Works--24.1%; and 25.7% on Ukraine companies, except OJSC Dnepropetrovsk Tube Works--12.3%, plus CJSC Nikopolsky Seamless Tubes Plant Niko Tube and OJSC Nizhnedneprovsky Tube Rolling Plant--both 25.1%.
Arkley (UK) of London is now the independent overseas trading company for the Chelyabinsk Pipe & Tube Rolling Mill, Russia's and the world's largest pipe mill with capacity for 3 million tons per year.