Stainless steel pipe is a type of hollow long round steel mainly used for industrial pipelines and mechanical structural components in industries such as petroleum, chemical, medical, food, light industry, and mechanical instruments. In addition, when the bending and torsional strength are the same, it is lighter in weight and therefore widely used in the manufacturing of mechanical components and engineering structures. It is also commonly used in furniture, kitchen utensils, etc.
Stainless steel pipes are divided into ordinary galvanized steel pipes, high-quality carbon structural steel pipes, alloy seamless stainless steel pipes, alloy pipes, bearing steel pipes, stainless steel pipes, bimetallic composite pipes, and finished and finished pipes according to materials to save precious metals and meet special requirements. There are various types of stainless steel pipes, with different main uses, technical requirements, and manufacturing steps. At present, the diameter range of seamless steel pipes is 0.1-4500mm. The wall thickness range is 0.01-250mm. In order to distinguish their characteristics, seamless steel pipes are usually classified according to the following steps.
Stainless steel pipes can be divided into round pipes and irregular pipes according to their cross-sectional shape. Irregular tubes include rectangular tubes, diamond shaped tubes, elliptical tubes, hexagonal tubes, octagonal tubes, and various asymmetric cross-section tubes. Alien tubes are widely used in various structural components, tools, and mechanical parts. Compared with circular pipes, irregular pipes generally have a larger moment of inertia, larger cross-sectional modulus, and greater bending torque, which can greatly reduce structural weight and save steel.
According to the shape of the longitudinal section, stainless steel pipes can be divided into equal section pipes and variable section pipes. Variable cross-section pipes include conical pipes, stepped pipes, periodic cross-section pipes, etc.
Stainless steel is mainly used in exhaust systems, accounting for more than half of the total consumption of automotive stainless steel, with 80% used for ferritic stainless steel. The exhaust gas generated by the car engine ultimately flows out of the muffler through the exhaust intake pipe, front pipe, hose, converter, and center pipe. The commonly used steel grades in exhaust systems include 409L, 436L, etc. Car mufflers mainly use stainless steel welded pipes. It is estimated that stainless steel pipes used in automobiles account for about 1.5% of the entire downstream consumption of stainless steel pipes, while the ratio of seamless and welded stainless steel pipes is about 2:1.
The petrochemical industry includes the fertilizer industry.
There is a high demand for stainless steel pipes. This industry mainly uses stainless steel seamless pipes, with specifications including 304.321.316.316L.347.317L, etc. The diameter is about 18-610 and the wall thickness is about 6mm-50mm (usually using medium and low pressure conveying pipes with specifications above 159mm).
Transport fluids such as water and gas.
Stainless steel pipes and their water transmission equipment are the basic water purification materials in the world, with strong corrosion resistance, such as cast iron pipes, galvanized steel pipes, plastic pipes, etc.
Preparation, storage, transportation, purification, regeneration, seawater desalination and other hydraulic material selection. The annual demand is about 25000 tons.
Equipment manufacturing and maintenance.
More than 20000 tons of stainless steel pipes are consumed annually. This type of industry mainly uses sanitary or stainless steel pipes. The sanitary seamless pipes made of imported SUS304.316L can meet the special requirements of various media in the food, biopharmaceutical field. Stainless steel has the advantages and good performance of stainless steel. The demand for kitchen equipment, food industry workbenches, utensils, medical equipment, tableware, towel racks, refrigerator racks, and other fields is constantly increasing.
