Boiler tube is a type of seamless tube. The manufacturing method is the same as that of seamless pipes, but there are strict requirements for the steel used in manufacturing steel pipes. According to the operating temperature, they are divided into two categories: general boiler tubes and high-pressure boiler tubes.
The mechanical properties of boiler tubes are important indicators to ensure the final performance (mechanical properties) of steel. It depends on the chemical composition and heat treatment system of the steel. In steel pipe standards, tensile properties (tensile strength, yield strength or yield point, elongation), hardness and toughness indicators as well as high and low temperature properties required by users are specified according to different usage requirements.
1. Generally, the operating temperature of boiler tubes is below 450°C. Domestic pipes mainly use No. 10 or No. 20 carbon steel hot-rolled pipes or cold-drawn pipes.
2. High-pressure boiler tubes are often exposed to high temperature and high pressure conditions. Under the action of high-temperature flue gas and water vapor, the tubes will oxidize and corrode. Steel pipes are required to have high durability, high corrosion resistance and good structural stability.
Boiler tube uses:
1. General boiler tubes are mainly used to manufacture water wall tubes, boiling water tubes, superheated steam tubes, locomotive boiler superheated steam tubes, large and small smoke tubes and arch brick tubes, etc.
2. High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air ducts, main steam pipes, etc. for high-pressure and ultra-high-pressure boilers. The supply and demand trend of the high-pressure boiler tube industry is generally stable, but the supply and demand situation of each specific sub-industry will be further differentiated.
