1. Stainless steel pipes are classified by material
It is 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, plated and coated pipes for saving precious metals and meeting special requirements. There are many kinds of stainless steel pipes, different uses, different technical requirements, and different production methods. The outer diameter of the currently produced steel pipe ranges from 0.1 to 4500mm, and the wall thickness ranges from 0.01 to 250mm. To distinguish its characteristics, steel pipes are usually classified as follows.
2. Classification by the production method
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 and cold-rolled pipes are the secondary Processing; welded pipes are divided into straight seam welded pipes and spiral welded pipes.
3. Classification by 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, diamond-shaped tubes, elliptical tubes, hexagonal tubes, octagonal tubes, and various asymmetrical tubes. Special-shaped tubes are widely used in various structural parts, tools, and mechanical parts. Compared with the round pipe, the special-shaped pipe generally has a larger moment of inertia and section modulus and has a larger resistance to bending and torsion, which can greatly reduce the weight of the structure and save steel. Stainless steel pipes can be divided into equal-section pipes and variable-section pipes according to the shape of the longitudinal section. Variable section tubes include tapered tubes, stepped tubes, and periodic section tubes.
4. According to the shape of the pipe end
Stainless steel pipes can be divided into light pipes and wire pipes (threaded steel pipes) according to the state of the pipe ends. The threading pipe can be divided into ordinary threading 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 threading pipes, use Special threaded connection), for some special pipes, to make up for the influence of the thread 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. Classification by use
According to the application, it can be divided into oil well pipe (casing, oil pipe, drill pipe, etc.), line pipe, boiler pipe, mechanical structure pipe, hydraulic prop pipe, gas cylinder pipe, geological pipe, chemical pipe (high-pressure fertilizer pipe, oil cracking pipe) ) and marine pipes, etc.
Post time: Aug-05-2022