High pressure boiler tube is a kind of boiler tube, which belongs to the category of seamless steel pipe. The manufacturing method is the same as that of seamless pipes, but there are strict requirements on the steel grades used to manufacture steel pipes. High-pressure boiler tubes are often used in high temperature and high pressure conditions, and the tubes will be oxidized and corroded under the action of high-temperature flue gas and water vapor. The steel pipe is required to have high lasting strength, high oxidation corrosion resistance, and good organizational stability.

High pressure boiler tube application:
Used for heating surface pipes of low and medium pressure boilers (working pressure is generally not more than 5.88Mpa, working temperature is below 450℃); used for high pressure boilers (working pressure is generally above 9.8Mpa, working temperature is between 450℃～650℃) ) heating surface pipes, economizers, superheaters, reheaters, pipes for petrochemical industries, etc.
Low and medium pressure boiler tubes: used to manufacture various low and medium pressure boilers, superheated steam tubes, boiling water tubes, water wall tubes and superheated steam tubes, large smoke pipes, small smoke pipes and arch brick pipes for locomotive boilers. Hot-rolled or cold-rolled (dial) seamless steel pipes with high-quality carbon structural steel. It is mainly made of No. 10 and No. 20 steel. In addition to ensuring the chemical composition and mechanical properties, it is necessary to perform hydrostatic tests, curling, flaring, flattening and other tests. Hot-rolled delivery is in hot-rolled state, and cold-rolled (dial) is delivered in heat-treated state. High-pressure boiler steel pipe: mainly used to manufacture high-quality carbon structural steel, alloy structural steel and stainless heat-resistant seamless steel pipe for steam boiler pipes with high pressure and above. These boiler pipes often work under high temperature and high pressure, The pipe will also be oxidized and corroded under the action of high temperature flue gas and water vapor. Therefore, the steel pipe is required to have high lasting strength, high oxidation resistance, and good organizational stability. The steel grades used are: high-quality carbon structure Steel grades are 20G, 20MnG, 25MnG; alloy structural steel grades are 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rust and heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high-pressure boiler tubes in addition to ensuring chemical composition and mechanical properties , to do the hydrostatic test one by one, to do the flaring and flattening test. Steel pipes are delivered in heat-treated condition. In addition, there are certain requirements for the microstructure, grain size and decarburization layer of the finished steel pipe.