Stainless steel seamless pipes are divided into hot-rolled (extruded) and cold-drawn (rolled) types based on manufacturing processes. Cold-drawn (rolled) pipes are further categorized into round and shaped pipes. Seamless steel pipes are classified into several varieties according to their uses:

  1. GB/T8162-1999 (Structural seamless steel pipes): Used for general and mechanical structures. Materials include carbon steel, 20#, 45# steel; alloy steels Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
  2. GB/T8163-1999 (Seamless steel pipes for fluid transport): Used in engineering and large equipment for fluid transportation. Materials include 20#, Q345, etc.
  3. GB3087-1999 (Seamless steel pipes for low and medium pressure boilers): Used for various low and medium pressure boiler components. Materials include 10#, 20# steel.
  4. GB5310-1995 (Seamless steel pipes for high-pressure boilers): Used for high-pressure water-tube boilers. Materials include 20G, 12Cr1MoVG, 15CrMoG, etc.
  5. GB1479-2000 (Seamless steel pipes for high-pressure fertilizer equipment): Used in chemical equipment and pipelines. Materials include 20#, 16Mn, 12CrMo, 12Cr2Mo, etc.
  6. GB9948-1988 (Seamless steel pipes for petroleum cracking): Used in petroleum refineries. Materials include 20#, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
  7. Geological drilling pipes (YB235-70): Used for core drilling in geological exploration.
  8. Diamond core drilling seamless steel pipes (GB3423-82): Used for diamond core drilling operations.
  9. Petroleum drilling pipes (YB528-65): Used in oil exploration with thickened ends.
  10. GB5312-1999 (Seamless carbon and carbon-manganese steel pipes for ships): Used in shipbuilding. Materials include 360, 410, 460 steel grades, etc.
  11. Seamless steel pipes for automobile half-shaft sleeves (GB3088-82): Used in automotive applications.
  12. High-pressure oil pipes for diesel engines (GB3093-86): Used in diesel engine injection systems.
  13. Precision inner diameter seamless steel pipes for hydraulic and pneumatic cylinders (GB8713-88): Used in hydraulic and pneumatic systems.
  14. Cold-drawn or cold-rolled precision seamless steel pipes (GB3639-83): Used in mechanical structures and hydraulic equipment.
  15. Structural stainless steel seamless pipes (GB/T14975-1994): Widely used in various industries for corrosion-resistant applications.

The company mentioned is a professional stainless steel pipe manufacturer, supplying various specifications of stainless steel products including pipes, plates, bars, coils, and specialized grades such as 304, 316L, 321, 310S, 309S, etc. They also offer shaped pipes, flat steel, angle steel, and round steel. The company serves as a major supplier to tooling companies, military enterprises, machining factories, and the automotive industry.