Stainless steel pipes are divided into ordinary carbon steel pipes, high-quality carbon structural steel pipes, alloy structural steel pipes, alloy steel pipes, bearing steel pipes, stainless steel pipes and bimetal composite pipes, coated and coated pipes according to their materials to save precious metals and meet special requirements. There are many types of stainless steel pipes, different uses, different technical requirements and different production methods. The steel pipes currently produced have an outer diameter of 0.1-4500 mm and a wall thickness of 0.01-250 mm. In order to distinguish its characteristics, steel pipes are usually divided into the following categories. 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 tubes of various cross-sections. Profiled tubes are widely used in various structural parts, tools and mechanical parts. Compared with the round tube, the special-shaped tube 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.

Advantages and disadvantages of stainless steel pipe welding: manual welding. It is very common to use and easy to operate, mainly relying on people to adjust. Welding rods are used as filler material for welds. Hand welding can weld almost all materials, even outdoors, so it is very adaptable. Welding generally uses direct current. The electrodes can be titanium covered electrodes or sealed electrodes. The titanium-clad electrode is easy to weld, the weld seam is beautiful, and the welding slag is easy to remove. However, if it is not used for a long time, it must be baked again to prevent the accumulation of moisture.

The appearance of the stainless steel tube is generally white, without embroidery. There will be embroidery or reddish brown on the surface of ordinary seamless steel pipes. Stainless steel is corrosion-resistant and has a much better finish than ordinary steel pipes. The seamless steel pipe is wire-drawing, without weld seam, and the material can be ordinary 20-gauge steel or stainless steel; the general technology of general stainless steel pipe is welding, and the material is stainless steel.

Stainless steel pipes can be divided into equal-section pipes and variable-section pipes according to the shape of the profiles. Variable section tubes include tapered tubes, stepped tubes and periodic section tubes. It can be divided into oil well tubing (casing, tubing, drill pipe, etc.). ), pipeline pipes, boiler pipes, mechanical structure pipes, hydraulic prop pipes, gas cylinder pipes, geological pipes, chemical pipes (high pressure fertilizer pipes, oil cracking pipes) and marine pipes, etc.