Stainless steel seamless steel pipe knowledge

Stainless steel seamless steel pipe is a hollow long steel pipe, which is widely used as a pipeline for transporting fluids, such as oil, natural gas, water, coal gas, steam, etc. In addition, when bending and torsional strength are the same, it is lighter in weight. Therefore, it is also widely used in manufacturing mechanical parts and engineering structures. It is also commonly used to produce various conventional weapons, gun barrels, artillery shells, etc.

Applications of stainless steel pipes
Stainless steel pipes are safe, reliable, hygienic, environmentally friendly, and economical. The thin-walled pipes and the successful development of new, reliable, simple, and convenient connection methods have given them more irreplaceable advantages than other pipes. They will be used more and more in engineering. , the use will become more and more popular, and the prospects are promising. With the implementation of my country's reform and opening up policy, the national economy was rapidly growing, and the construction of urban residences, public buildings, and tourist facilities in large quantities, put forward new requirements for hot water supply and domestic water supply. In particular, people pay more and more attention to water quality issues, and their requirements are constantly increasing. Galvanized steel pipes, a commonly used pipe material, will gradually withdraw from the stage of history due to its corrosive nature. Under the influence of relevant national policies, plastic pipes, composite pipes, and copper pipes have become common pipe materials in pipeline systems. However, in many cases, stainless steel pipes have more advantages, especially thin-walled stainless steel pipes with a wall thickness of only 0.6 to 1.2 mm. They have great advantages in high-quality drinking water systems, hot water systems, and water supply systems that put safety and hygiene first. Safe, reliable, hygienic environmentally friendly, economical, and applicable. It has been proven by domestic and foreign engineering practices that it is a new, energy-saving, and environmentally friendly pipe with comprehensive performance in the water supply system. It is also a very competitive water supply pipe that will play an incomparable role in improving water quality and improving people's living standards. In the building water supply piping system, since the glorious history of galvanized steel pipes has ended for a hundred years, various new plastic pipes and composite pipes have been developed rapidly. However, various pipe materials still have some shortcomings to varying degrees and are far from being fully suitable for water supply pipes. system needs and national requirements for drinking water and related water quality. Therefore, relevant experts predict that building water supply pipes will eventually return to the era of metal pipes. Based on foreign application experience, thin-walled stainless steel pipes are recognized as comprehensive performance pipes among metal pipes.

Stainless steel seamless steel pipe knowledge
1. Classification by production method
(1) Seamless steel pipe - cold drawn pipe, extruded pipe, cold rolled pipe Stainless steel seamless steel pipe is a long steel product with a hollow section and no seams around it.

The manufacturing process and flow of seamless steel pipes: smelting > steel ingot > rolling > sawing > peeling > perforation > annealing > pickling > dusting > cold drawing > cutting > pickling > warehousing

Characteristics of seamless steel pipes
1. The thicker the wall thickness of the product, the more economical and practical it is. The thinner the wall thickness, the processing cost will increase significantly;
2. The process of this product determines its limitations. Generally, seamless steel pipes have low precision: uneven wall thickness, low brightness of the inner and outer surfaces of the pipe, high cost of sizing, and pitting and black spots on the inner and outer surfaces that are difficult to remove;
3. Its detection and shaping must be processed offline. Therefore, it reflects its superiority in terms of high pressure, high strength, and mechanical structural materials.

(2) Classification of welded pipes
(a) Classification by process - gas-shielded welded pipe, arc welded pipe, resistance welded pipe (high frequency, low frequency)
(b) Classification by weld seam - straight seam welded pipe, spiral welded pipe

Stainless steel welded steel pipe: A welded steel pipe, referred to as welded pipe, is a steel pipe made by welding steel plates or steel strips after being curled and formed by a unit and a mold.

The manufacturing technology and flow of welded steel pipes: Steel plate > Slitting > Forming > Welding > Induction bright heat treatment > Internal and external weld bead treatment > Shaping > Sizing > Eddy current testing > Laser sizing > Pickling > Warehousing

Characteristics of welded steel pipes
1. This product is produced continuously online. The thicker the wall thickness, the greater the investment in the unit and welding equipment, and the less economical and practical it is. The thinner the wall thickness, the lower its input-output ratio will be; secondly, the process of the product determines its advantages and disadvantages. Generally, welded steel pipes have high precision, uniform wall thickness, and high brightness inside and outside the pipe (steel pipes are determined by the surface grade of the steel plate). Surface brightness), can be arbitrarily fixed length. Therefore, it reflects its economy and aesthetics in high-precision, medium, and low-pressure fluid applications.
2. Classification according to cross-sectional shape (1) Circular steel pipe (2) Rectangular pipe
3. Classification by wall thickness (1) thin-walled steel pipe (2) thick-walled steel pipe