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. They are also used in petrochemical and other industries. They usually use medium and low-pressure pipelines with specifications above Φ159mm. In addition, automobile mufflers can also be made of stainless steel welded pipes. become.

Stainless steel seamless pipes are mainly used in chemical industry, chemical fertilizers, chemical fiber (three chemical industries), petroleum, electric boilers, machinery, aerospace, nuclear industry, defense industry and other demanding industries.

Stainless steel pipes can be used in oil drills. 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. However, most of these stainless steel pipes Still have to rely on imports.

Stainless steel pipes 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.

"Three Hua" industries use heat-resistant stainless steel pipes
Heat-resistant stainless steel pipes are mainly used in heat exchange and fluid transportation in the "three modernization" 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. The potential market is large-diameter pipes for petroleum cracking furnaces and low-temperature transportation pipes. Due to their special requirements for heat resistance and corrosion resistance and the inconvenience of equipment installation and maintenance, the equipment is required to have a long service life. The pipes need to be optimized through material composition control and special heat treatment methods. Mechanical properties and usage performance. Another potential market is special steel pipes for the 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, fertilizer and other fields. It is characterized by good stress corrosion resistance and application temperature is less than 350℃. 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.