Stainless steel pipe classification

Stainless steel pipe is a high-strength, corrosion-resistant steel pipe mainly composed of chromium, nickel, carbon and other elements. Stainless steel pipes can be divided into many types. According to different uses and performance characteristics, the common classification methods of stainless steel pipes are as follows:

According to different constituent elements, it can be divided into austenitic stainless steel pipe, martensitic stainless steel pipe, ferritic stainless steel and duplex stainless steel pipe. Austenitic stainless steel pipes have high strength and corrosion resistance and are suitable for high temperature and high pressure environments. Martensitic stainless steel pipe has high plasticity and toughness and is suitable for hot forming and cold forming processes. Ferritic stainless steel generally does not contain nickel, and sometimes contains small amounts of Mo, Ti, Nb and other elements. This type of steel has the characteristics of large thermal conductivity, small expansion coefficient, good oxidation resistance, and excellent stress corrosion resistance. It is mostly used to make resistant steel. Parts corroded by atmosphere, water vapor, water and oxidizing acids. Duplex stainless steel pipe has the characteristics of austenitic and ferritic stainless steel and is suitable for a variety of working conditions

According to different production methods, they can be divided into welded steel pipes and seamless steel pipes. Welded steel pipe is a stainless steel pipe made by welding steel plates or steel strips after being curled and formed by a unit and a mold. The welded steel pipe has high precision, uniform wall thickness, high brightness on the inner and outer surfaces of the stainless steel pipe, and can be arbitrarily cut to length. Therefore, it reflects its economy and aesthetics in high-precision, medium and low-pressure fluid applications. Seamless steel pipe is a long strip of steel with a hollow section and no seams around it. Seamless steel pipes have low precision, uneven wall thickness, low brightness on the inner and outer surfaces of the pipe, and high cost of cutting to length. However, they demonstrate its superiority in terms of high pressure, high strength, and mechanical structural materials.
According to different surface conditions, it can be divided into hot-rolled stainless steel pipes, cold-rolled stainless steel pipes and stretched stainless steel pipes. Hot-rolled stainless steel pipes have a smooth surface, high plasticity, toughness and mechanical strength, are resistant to corrosion by acids, alkaline gases, solutions and other media, are easy to process, and have good ductility. The thickness of cold-rolled stainless steel pipe is more precise, the surface is smooth and beautiful, and it also has various superior mechanical properties, especially in terms of processing performance. Stretched stainless steel pipes have high strength and precision and are suitable for high-precision mechanical structures.
According to different application fields, it can be divided into petroleum stainless steel pipes, chemical stainless steel pipes, food stainless steel pipes, electric power stainless steel pipes, decorative stainless steel pipes, etc. Petroleum stainless steel pipes have high corrosion resistance and high temperature stability, and are suitable for oil field mining and petrochemical industries. Chemical stainless steel pipes have high corrosion resistance and wear resistance and are suitable for chemical production and transportation. Food stainless steel pipes have high hygiene and corrosion resistance and are suitable for food processing and transportation. Power stainless steel pipes have high electrical insulation and corrosion resistance and are suitable for power engineering and power transmission fields. Decorative stainless steel pipes have low requirements and are mainly used in engineering decoration, construction, structure, etc.
According to different constituent elements, production methods, surface conditions and application fields, stainless steel pipes can be divided into many types, each with special properties and characteristics.