Cold-rolled seamless pipe

Cold-rolled seamless pipe
Hot-rolled seamless pipe

Advantages

Cold-rolled pipes are designed for operation in the widest temperature range with significant pressure drops. They are resistant to corrosion, have an attractive appearance and meet modern sanitary standards. They have a thinner wall than hot-rolled pipes, yet they are stronger and more durable than welded pipes. Reliability, durability, and the ability to recycle scrap for reuse, makes these pipes highly profitable.

Disadvantages

Almost the only disadvantage is the higher price.

Production

GOST 8734-75 regulates the production of steel cold and heat-deformed pipes of general purpose made of carbon or alloy steel. Depending on the purpose, the composition is normalized by the following GOST: 380-94; 1050; 4543 and 19 281. Technical requirements for steel pipes are defined by GOST 8733-78.

Cold rolled steel pipes are subdivided

Quality
Quality GOST Note
Б 1050, 14 959, 4543 и 19 281 With standardization of chemical composition of quiet steel grades
В 1050, 14 959, 4543 и 19 281 With standardization of mechanical properties and chemical composition in accordance with the requirements of the relevant standards.
Д - Without standardization of mechanical properties and chemical composition, but with control of test-hydraulic pressure
Е - Heat-treated. Steel grades, heat treatment mode and mechanical properties are approved in the established order.
Outer diameter (Dn) to wall thickness ratio
Dn/s ratio Parameters Name
greater than 40 Ø 20 mm and with a wall thickness of 0.5 mm or less Particularly thin-walled seamless
12,5 - 40 Ø 20 mm and under with a wall of 1.5 mm Thin-walled seamless
6 - 12,5; - Thick-wall seamless
Up to 6 - Heavy-walled Seamless 3.

3. By accuracy, section, length, purpose.

Outer diameter (OD) to wall thickness.
Accuracy of production (external diameter and wall thickness): By sectional shape According to the length Sectional shape

Normal accuracy

Raised accuracy

Rectangular,

Square, round.

Out of measure length

1,5 - 11,5 м

  • Measured length
  • 4,5 - 9 м
  • With maximum length variation
  • + 10 mm;

measured length

1,5 - 9 m with an allowance for each cut of 5 mm.
  • General purpose - GOST 8734-75;

For shipbuilding

Of steel 10 - GOST 1060-80;

  • Structural of alloy and non-alloy steels 20А, 30ХГСА - GOST 21 729-76;
  • For aviation oil pipelines and gasoline pipelines of steel 20A, 30ХГСА - GOST 19 277-73;

Extra fine steel for production of special equipment parts - GOST 14-3-966-80.

Application

Production of industrial and sanitary pipelines. Cold-formed seamless pipes are used in the power engineering, machine building, oil and gas and chemical industries, the military-industrial complex. Often, such pipes serve as a billet for the production of rolling parts in mechanical engineering and prefabricated structures, in a variety of areas of modern economics.

Supply

We supply certified cold-deformed pipes at the best prices. The pipe assortment complies with GOST 8734-78. The technical documentation includes data on the percentage composition and operational qualities of the products. With us it is easy to buy in bulk any semi-finished products for large-scale productions. We also cooperate with retail buyers. High level of service and responsiveness of service is the face of our company.

Buy at a bargain price

Elektrovek-Steel always has tubes of different cross-sections in stock at an optimal price. It is formed taking into account European rates for ferrous and nonferrous metals, without the inclusion of additional costs. We supply certified products of domestic and foreign producers. Cooperation with us has a number of advantages. Our specialists will be happy to advise you on purchasing any alloys, the correct choice of which will depend on the performance and durability of the equipment. We will help to determine not only the optimum parameters of the product, but also offer the best price.