1. Stainless steel pipes are classified according to material
They 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 bimetal composite pipes, plated and coated pipes, etc. There are many types of stainless steel pipes with different uses, different technical requirements, and different production methods. The current production of steel pipes has an outer diameter range of 0.1-4500mm and a wall thickness range of 0.01-250mm.
2. Stainless steel pipes are classified according to production methods
Stainless steel pipes are divided into two categories: seamless pipes and welded pipes according to production methods. Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes and extruded pipes. Cold drawn pipes and cold rolled pipes are secondary processing of steel pipes; Welded pipes are divided into straight seam welded pipes and spiral welded pipes.
3. Stainless steel pipes are classified according to cross-sectional shape
Stainless steel pipes can be divided into round pipes and special-shaped pipes according to their cross-sectional shapes. Special-shaped tubes include rectangular tubes, rhombus tubes, oval tubes, hexagonal tubes, octagonal tubes and various asymmetrical cross-section tubes. Special-shaped tubes are widely used in various structural parts, tools and mechanical parts. Compared with round pipes, special-shaped pipes generally have a larger moment of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce the structural weight and save steel.
Stainless steel pipes can be divided into equal-section pipes and variable-section pipes according to their longitudinal cross-section shapes. Variable cross-section pipes include tapered pipes, stepped pipes and periodic cross-section pipes.
4. Stainless steel pipes are classified according to pipe end shape
Stainless steel pipes can be divided into plain pipes and threaded pipes (threaded steel pipes) according to the condition of the pipe end. Threaded pipes can be divided into ordinary threaded pipes (pipes for low-pressure transportation of water, gas, etc., which are connected by ordinary cylindrical or conical pipe threads) and special threaded pipes (pipes for petroleum and geological drilling. For important threaded pipes, use Special thread connection), for some special pipes, in order to compensate for the influence of threads on the strength of the pipe end, the pipe end is usually thickened (internal thickening, external thickening or internal and external thickening) before threading.
5. Stainless steel pipes are classified according to their uses
According to the use, it can be divided into oil well pipes (casing, oil pipes and drill pipes, etc.), pipeline pipes, boiler pipes, mechanical structural pipes, hydraulic support pipes, gas cylinder pipes, geological pipes, chemical pipes (high-pressure fertilizer pipes, petroleum cracking pipes) ) and ship pipes, etc.

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