1. What is a boiler tube?
Boiler tubes refer to steel materials that are open at both ends, have a hollow section, and are longer than their surroundings. According to the production method, it can be divided into seamless steel pipe and welded steel pipe. Wall thickness implies a wide range of sizes, from small diameter capillary tubes to large diameter tubes of several meters in diameter. Steel pipes can be used in pipelines, thermal equipment, machinery industry, petroleum geological exploration, containers, chemical industry and special purposes.
2. Classification
Boiler tubes are divided into general boiler tubes and high-pressure boiler tubes according to their high-temperature performance, and can be divided into various steel tubes according to their different requirements.
3. Production method of boiler tubes
Boiler tube is a type of seamless tube. The manufacturing method is the same as that of seamless steel pipes. According to the use temperature, it can be divided into general boiler tubes and high-pressure boiler tubes.
①The temperature of boiler tubes is generally below 350°C. Domestic pipes mainly use No. 10 and 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 during use. Pipes will oxidize and corrode under the action of high-temperature flue gas and water vapor. Steel pipes are required to have high lasting strength, high oxidation resistance, corrosion resistance and good structural stability.
4. Purpose of boiler tubes
① General boiler tubes are mainly used to make water wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes and arch brick tubes.
② High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guide tubes, main steam pipes, etc. for high-pressure and ultra-high-pressure boilers.
5. Use steel number
(1) The grades of high-quality carbon structural steel are 20G, 20MnG, and 25MnG.
(2) Alloy structural steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.
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