Stainless steel pipe is a kind of hollow long round steel, which is widely used in industrial transmission pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instruments, etc. In addition, when the bending and torsional strength are the same, the weight is light, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used in the production of various conventional weapons, barrels, shells, etc.

Stainless steel pipes are divided into ordinary carbon steel pipes, high-quality carbon structural steel pipes, alloy structural pipes, alloy steel pipes, bearing steel pipes, stainless steel pipes, and bimetallic composite pipes, coated and coated pipes to save precious metals and meet special requirements. There are many kinds of stainless steel pipes with different uses, different technical requirements and different production methods. The outer diameter of steel pipes currently produced ranges from 0.1 to 4500mm, and the wall thickness ranges from 0.01 to 250mm. In order to distinguish its characteristics, steel pipes are usually classified according to the following methods.

Production mode

According to the production mode, stainless steel pipes are divided into seamless pipes and welded pipes. Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold drawn pipes and extruded pipes. Cold drawing and cold rolling are the secondary processing of steel pipes; Welded pipe is divided into straight seam welded pipe and spiral welded pipe.

Section shape

Stainless steel pipes can be divided into round pipes and special-shaped pipes according to the cross-sectional shape. Special shaped tubes include rectangular tubes, rhombic tubes, elliptical tubes, hexagonal tubes, octagonal tubes and various cross-section asymmetric tubes. Special shaped pipes are widely used in various structural parts, tools and mechanical parts. Compared with circular pipes, special-shaped pipes generally have larger moment of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce the structural weight and save steel. Shaanxi hualite Trading Co., Ltd. main business; Baosteel, Baotou Steel and other national highquality seamless steel tubes, alloy tubes, etc. Youqi is famous in the industry for operating thick wall tubes, special tubes, high pressure boiler tubes and alloy tubes.Stainless steel pipes can be divided into equal section pipes and variable section pipes according to the vertical section shape. Variable cross-section tubes include conical tubes, stepped tubes and periodic cross-section tubes

Tube end shape

Stainless steel pipe can be divided into smooth pipe and threading pipe (with threaded steel pipe) according to the state of pipe end. Threading pipes can also be divided into ordinary threading pipes (pipes for transporting low pressure such as water and gas, which are connected by ordinary cylindrical or conical pipe threads) and special threaded pipes (pipes for petroleum and geological drilling, which are connected by special threads for important threading pipes). For some special pipes, in order to make up for the impact of threads on the strength of pipe ends, pipe ends are usually thickened (internal thickening, external thickening or internal and external thickening) before threading.

Use classification

It can be divided into oil well pipes (casing, oil pipe and drill pipe, etc.), pipeline pipes, boiler pipes, mechanical structure pipes, hydraulic prop pipes, gas cylinder pipes, geological pipes, chemical pipes (high-pressure fertilizer pipes, petroleum cracking pipes) and marine pipes according to their uses