1. Automobile industry
Stainless steel is mainly used in the exhaust system, accounting for more than 1/2 of the total amount of automotive stainless steel, 80 percent of which is ferritic stainless steel. The exhaust gas produced by the car engine passes through the exhaust gas intake pipe, the front pipe, the hose, the converter, the center pipe and finally flows out of the muffler. Common steel grades for exhaust systems are 409L, 436L, etc. Automotive mufflers mainly use stainless steel welded pipes. It is estimated that the stainless steel pipes used in automobiles account for about 1.5 percent of the total downstream use of stainless steel pipes, while the proportion of stainless steel seamless pipes and welded pipes is about 2:1.
2. Petrochemical industry including fertilizer industry
The demand for stainless steel pipes is very large. The industry mainly uses stainless steel seamless pipes. The specifications include: 304, 321, 316, 316L, 347, 317L, etc., the outer diameter is about ￠18-￠610, and the wall thickness is 6mm-50mm Left and right (generally, medium and low pressure conveying pipes with specifications above Φ159mm are selected), and the specific application fields are: furnace pipes, material conveying pipes, heat exchanger pipes, etc.
3. Fluid transportation such as water and gas
Stainless steel pipes and their water delivery equipment are good basic water purification materials with strong anti-corrosion properties, which cannot be compared with cast iron pipes, carbon steel pipes, and plastic pipes.
Selection of materials for water industry such as water preparation, storage, transportation, purification, regeneration, and seawater desalination. The annual demand is about 25,000 tons.
4. Equipment manufacturing and maintenance
The annual consumption of stainless steel pipes is more than 20,000 tons. Such industries mainly use sanitary or antibacterial grade stainless steel pipes. Hygienic seamless pipes made of imported SUS304 and 316L can meet the special requirements of various media in the fields of food and biopharmaceuticals. Antibacterial stainless steel has the advantages of stainless steel and good antibacterial properties, and its demand is increasing in the fields of kitchen equipment, workbenches and utensils in the food industry, medical equipment, tableware and towel racks in daily life, and brackets for refrigerators.