Classification of some application areas of stainless steel pipes

Stainless steel welded pipes are mainly used in landscape decoration, light industry, pharmaceuticals, water supply and other industries, and are also used in petrochemical and other industries. Usually, medium and low pressure pipelines with specifications above Φ159mm are used. In addition, automobile mufflers can also be made of stainless steel welded pipes. 

Stainless steel seamless pipes are mainly used in industries with high requirements such as chemical industry, chemical fertilizer, chemical fiber (three chemical industries), petroleum, electric boiler, machinery, aerospace, nuclear industry, and national defense industry.
Oil drills can use stainless steel pipes, stainless steel non-magnetic drill collars, super ferritic stainless steel Cr13, Cr25 and other oil casings with high resistance to CO, CO2 and Cl-corrosion are all used in oil field drilling and production, but most of these stainless steel pipes are Still have to rely on imports.
Stainless Steel Tubes for Thermal Power Boilers
Thermal power boilers mostly use heat-resistant stainless austenitic steel boiler tubes. A supercritical thermal power unit boiler of over 600,000 kW requires 200-500 tons of stainless and heat-resistant steel pipes, which is also relatively dependent on imports.
"Sanhua" industry uses heat-resistant stainless steel pipes
Heat-resistant stainless steel pipes are mainly used in heat exchange and fluid transportation in the "three chemical" industries. The market capacity is the largest, and the domestic market demand is about 160,000 tons per year. And users have extremely strict requirements for such stainless steel pipes, and most of them rely on imports to meet their needs. Potential markets are large-caliber petroleum cracking furnace pipes and low-temperature conveying pipes. Because of their special heat-resistant and corrosion-resistant requirements and inconvenient equipment installation and maintenance, the equipment requires a long service life. It is necessary to optimize the pipe material through material composition control and special heat treatment methods Mechanical properties and usability. Another potential market is special steel pipes for chemical fertilizer industry (urea, phosphate fertilizer), the main steel grades are 316Lmod and 2re69. At present, the above-mentioned stainless steel pipes basically rely on imports.
Duplex (fluid, heat exchanger) stainless steel tubes
Duplex stainless steel is mainly used in chemical industry, chemical fertilizer and other fields. It is characterized by good stress corrosion resistance and the application temperature is less than 350 °C. Due to its high strength, stress resistance, corrosion resistance and economy, duplex stainless steel pipes are now widely used in the manufacture of heat exchangers and fluid pipes.