Generally, the operating temperature of small-diameter boiler steel pipes is below 350°C. Domestic pipes are mainly made of No. 10 and No. 20 carbon steel hot-rolled pipes or cold-drawn pipes.

Generally, small-diameter boiler steel pipes are mainly used to make water-cooled wall pipes, boiling water pipes, superheated steam pipes, superheated steam pipes for locomotive boilers, large and small smoke pipes arch brick pipes, etc.

GB5310-95 "Seamless Steel Pipe for High-Pressure Boilers" regulations. The chemical composition test method is by the relevant parts of GB222-84 and "Chemical Analysis Methods of Steel and Alloys" and GB223 "Chemical Analysis Methods of Steel and Alloys".

High-pressure boiler steel pipes are often exposed to high temperatures and high-pressure conditions when used. Under the action of high-temperature flue gas and water vapor, steel pipes will oxidize and corrode. Steel pipes are required to have high lasting strength, high resistance to oxidation and corrosion, and good structural stability.