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 bimetal composite pipes, coated and coated pipes 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 outer diameter range of steel pipe currently produced is 0.1-4500mm, and the wall thickness range is 0.01-250mm. To distinguish its characteristics, steel pipes are usually classified as follows.
Classified by production method:
Stainless steel pipes are divided into two types of seamless pipes and welded pipes according to the production method. Seamless steel pipes can be divided into hot rolled pipes, cold rolled pipes, cold drawn pipes, and extruded pipes. Cold drawn and cold rolled are the secondary of steel pipes. Processing; Welded pipes are divided into straight seam welded pipes and spiral welded pipes.
Classified by section shape:
Stainless steel tubes can be divided into round tubes and special-shaped tubes according to the cross-sectional shape. Special-shaped tubes include rectangular tubes, diamond tubes, oval tubes, hexagonal tubes, octagonal tubes, and various asymmetric 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 a section modulus, and has greater 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 their longitudinal section shapes. Variable section tubes include conical tubes, stepped tubes and periodic section tubes.
Classified by tube shape:
Stainless steel tube can be divided into light tube and wire tube (with threaded steel tube) according to the state of the tube end. Car wire tubes can be divided into ordinary car wire tubes (low-pressure pipes for water and gas transmission, using ordinary cylindrical or conical pipe threaded connections) and special threaded pipes (pipes for petroleum and geological drilling. For important car wire tubes, use Special thread connection). For some special-purpose pipes, in order to compensate for the effect of the thread on the strength of the pipe end, the pipe end is usually thickened before the wire (inner thickening, outer thickening, or inner and outer thickening).
Classified by use:
It can be divided into oil well pipes (casings, oil pipes and drill pipes, etc.), pipeline pipes, boiler pipes, mechanical structure pipes, hydraulic pillar pipes, gas cylinder pipes, geological pipes, chemical pipes (high-pressure fertilizer pipes, petroleum cracking pipes) ) And marine pipes.
Production process of stainless steel welded pipe:
Raw materials–Striping–Welded pipe–Finishing–Polishing–Inspection (spray printing)-Packaging–Shipping (warehouse) (Decorative welded pipe).
Raw materials–Striping–Welded pipes–Heat treatment–Straightening–Straightening–Finishing–Pickling–Hydraulic testing–Inspection (spray printing)-Packing–Shipping (warehousing) (Pipe for welded pipe industry).