Use of boiler tubes
①General boiler tubes are mainly used to manufacture water wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes and arch brick tubes, etc.
②High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, gas guide tubes, main steam tubes, etc. of 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. Industry insiders pointed out that the most critical link is the use and promotion of new energy-saving thermal insulation 20g high-pressure boiler tube equipment.
Steel grade of boiler tubes
1) High-quality carbon structural steel grades are 20G, 20MnG, and 25MnG.
(2) Alloy structural steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.
(3) 1Cr18Ni9 and 1Cr18Ni11Nb boiler tubes commonly used in rust-resistant and heat-resistant steels must be subjected to hydrostatic tests one by one, as well as flaring and flattening tests, in addition to ensuring chemical composition and mechanical properties.
physical properties
1) Regulations on seamless steel pipes for low and medium pressure boilers. Tensile test according to T228-87, hydraulic test according to T241-90, flattening test according to T246-97, flaring test according to T242-97, cold bending test according to GB244-97.
(2) Regulations on seamless steel pipes for high-pressure boilers. Tensile test, hydraulic test and flattening test are the same as those specified in GB3087-82; impact test is according to GB229-94, flaring test according to T242-97, grain size test according to YB/T5148-93; microstructure test according to GB13298- 91. The decarburization layer inspection shall be in accordance with GB224-87, and the ultrasonic inspection shall be in accordance with T5777-96.
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