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 processes of steel pipes. Processing; welded pipes are divided into straight seam welded pipes and spiral welded pipes.

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 resistance to bending and torsion, which can greatly reduce the weight of the structure and save steel.

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. 

The production process of stainless steel seamless pipes:

Round steel preparation, heating, hot rolling and perforation, cutting, pickling, grinding, lubrication, cold rolling processing, degreasing, solution heat treatment, straightening, pipe cutting, pickling, finished product inspection.