Characteristics of seamless steel pipe

Seamless steel pipe is actually a hollow cross section and both sides of the expansion of the resistance to air, steam, water and other weak corrosive media and acid, alkali, salt and other chemical corrosion medium corrosion of steel pipe. Also known as acid-resistant stainless steel. Stainless steel pipe suppliers are reputable to protect the environment from hygienic, cheap, and also thinner tubes as well as new, reliable, and effective ways to improve a simple and convenient connection, resulting in more irreplaceable benefits. There will be more and more engineering use, is more and more and prospects. Seamless steel pipe for the use of engineering and construction is very widely, it is a hollow steel strip no seams, it is mainly used to transport liquids pipelines, different look and general steel,one of those heavy type steel, it has a strong resistance to corrosion, resistant to general corrosion.

Seamless steel pipe for the use of engineering and construction is very widely, it is a hollow steel strip no seams, it is mainly used to transport liquids pipelines, different look and general steel,one of those heavy type steel, it has a strong resistance to corrosion, resistant to general corrosion.

Compared with other plastic seamless steel pipe having strong mechanical resistance, impact regardless of how high a temperature is not interested in the use of seamless steel pipe, it is mounted and the other pipe is the same, can replace other piped water and other liquids.


Hot rolled seamless steel pipe
Hot-rolled seamless steel pipe production base deformation process can be summarized as three stages: perforation, extension and finishing.

Seamless steel pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. seamless steel pipes dominates 65% of market share in Chinese boiler industry.

Condition on delivery:

Term Symbol Explanation
Cold-finished/hard
(cold-finished as-drawn)
BK No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft
(lightly cold-worked)
BKW After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed GBK After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized NBK The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

Seamless steel pipe chemical analysis: the chemical composition of the material for chemical analysis, chemical composition to meet the standard requirements.

Seamless steel pipe pressure and hydrostatic test is for pressure tube by into the hydrostatic test, which do not maintain the prescribed pressure value not less than 5 seconds, not to disclose, the regular supply hydraulic pressure test is 2.45MPa pressure The pressure test is P = 0.5MPAa.

The corrosion test: industrial corrosion-resistant steel pipe according to standard regulations or agreement between the corrosion of steel pipe corrosion resistance test, no intergranular corrosion.

Features of Seamless steel pipe:
  • First, the thicker the wall thickness of the solution, it is really more cost effective and wise, the thinner the wall thickness, and its processing costs will appreciate sharply;
  • Second, from the process of the product determines its limitations, from the general seamless steel pipe with low accuracy: wall thickness uneven, low brightness tube appearance, fixed length of high cost, and pitting in the appearance of black spots is difficult to bring go;
  • Third, testing and plastic must be off-line. So it really is in the higher pressure, high strength, mechanical structure of wood reflects its superiority.
Characteristics of seamless steel pipes are as follows:
  • High precision can do small batch production.
  • Smaller diameter.
  • Weldability strong, high compression capability.
  • Steel pipe superior performance, relatively dense metal.
  • Steel Cross area is more complex.
  • High precision cold drawn products, good surface quality.



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