25MnG High Pressure Boiler Steel Pipe
25MnG high-pressure boiler steel pipe is a seamless steel pipe used for the heating surface pipe of high-pressure boilers. Its implementation standard is GB/T5310-2017. This kind of steel pipe is mainly used to manufacture heating surface pipes of high-pressure boilers with working pressure above 9.8Mpa and working temperature between 450℃ and 650℃, such as headers, superheaters, reheaters, economizers, water walls, etc. . In addition, it can also be used for pipes in the petrochemical industry, etc.
Since 25MnG boiler steel pipes work under high temperatures and high pressures, it is necessary to ensure that the steel pipes have high lasting strength, high oxidation resistance, and good structural stability during the manufacturing process. Steel pipes are usually delivered in a heat-treated state, and there are certain requirements for the microstructure, grain size, decarburization layer, etc. of the finished steel pipe.
The usage parts and usage temperatures of 25MnG Seamless boiler pipe are basically the same as those of 20G. It is mainly used for water-cooled walls, economizers, low-temperature superheaters and other components with operating temperatures below 500°C. Therefore, it has very wide application prospects in the manufacture of boilers and superheaters.
Chemical composition of GB 5310 25MnG high pressure seamless boiler tubes
| Steel Grade | C | Si | Mn | S | P |
| 25MnG | 0.22-0.27 | 0.17-0.37 | 0.70-1.00 | 0.015 | 0.025 |
Mechanical properties of 25MnG seamless boiler tubes
| Grade | Tensile strength | Yield point(Mpa) | Elongation(%) | Impact(J) |
| (Mpa) | not less than | not less than | not less than | |
| 25MnG | 485-640 | 275 | 20/18 | 40/27 |
High Pressure Seamless Boiler Tubes
gnee has many years of industry experience, and the annual output of the factory reaches 250,000 tons. Boiler steel pipes, ultra-thick wall steel pipes, alloy steel pipes, extra-long steel pipes, and fixed-size steel pipes are our production advantages.
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