Seamless steel pipes for low and medium pressure boilers (GB3087-2008) are high-quality carbon structural steels used to manufacture superheated steam pipes, boiling water pipes for low and medium pressure boilers of various structures, and superheated steam pipes and arch brick pipes for locomotive boilers. Hot rolled and cold drawn (rolled) seamless steel tubes.
 Seamless steel pipes for high-pressure boilers are high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipes for the heating surface of water-tube boilers with high pressure and above.
 High-pressure seamless steel pipes for fertilizer equipment are high-quality carbon structural steel and alloy steel seamless steel pipes suitable for chemical equipment and pipelines with working temperature of -40~400 and working pressure of 10~30Ma .
 Seamless steel pipes for petroleum cracking are seamless steel pipes suitable for furnace tubes, heat exchangers and pipelines in petroleum refineries.