The high pressure boiler tube is a type of boiler tube and belongs to the category of seamless steel tubes. The manufacturing method is the same as that of the seamless pipe, but there are strict requirements for the steel used in the manufacture of the steel pipe. High-pressure boiler tubes are often subjected to high temperature and high pressure conditions, and the tubes may oxidize and corrode under the action of high temperature flue gas and water vapor. Steel pipes are required to have high durability, high corrosion resistance and good structural stability. High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guiding tubes, main steam tubes, etc. for high-pressure and ultra-high pressure boilers.
Due to the long-term operation of the boiler tube under high temperature and high pressure conditions, the material will creep, plasticity and toughness will decrease, the original structure will change, and corrosion will occur. Steel pipes used as boilers shall have:
(1) sufficient permanent strength;
(2) sufficient plastic deformation capacity;
(3) minimum ageing tendency and hot brittleness;
(4) high oxidation resistance, coal ash resistance, natural gas resistance Corrosion, steam and stress corrosion properties at high temperatures;
(5) good structural stability and good process performance.
The steel grades of high-pressure boiler tubes are carbon steel and pearlitic, ferritic and austenitic stainless steel.
In order to improve the thermal efficiency and reduce fuel consumption of thermal power generating units, countries around the world are mainly developing large-capacity, high-parameter (high-temperature, high-voltage) thermal power units (1000MW or more). The steam pressure is increased to 31.5~34.3MPa, and the superheated steam temperature is 595-650°C, which develops to the ultra-high pressure critical pressure, which puts higher requirements on the high-pressure boiler tube. New steel grades have been developed for this purpose to meet the needs of high-parameter power station boilers.
For heating pipes with low and medium pressure boilers (working pressure is generally not more than 5.88Mpa, working temperature is below 450°C); used in high pressure boilers (working pressure is generally above 9.8Mpa, working temperature is between 450°C and 650°C) Heating surface tube, economizer, superheater, reheater, petrochemical industrial pipe, etc.
ASTM A106 Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service
ASTM A335 Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
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