Temperature Resistance for Different Materials of Boiler Tubes

The high temperature resistance of boiler tube refers to their ability to withstand and maintain stable performance in high temperature environments. The high temperature resistance of boiler tubes varies depending on the material. The following are the high temperature resistance of some common boiler tube materials:

Carbon steel boiler tubes

Generally, carbon steel boiler tubes have relatively poor high temperature resistance and can usually only be used below 500 degrees Celsius. At high temperatures, carbon steel will soften and creep, resulting in deformation, rupture, and even increased risk of tube bursting.

Alloy steel boiler tubes

Alloy steel boiler tubes are made of carbon steel with a variety of alloy elements, such as chromium, molybdenum, nickel, etc., which significantly improves heat resistance. This type of boiler tube can be used above 800 degrees Celsius and can withstand higher operating temperatures and heat loads. It has good creep resistance, can maintain good strength and stability at high temperatures, and reduce deformation and damage caused by creep.

Stainless steel boiler tubes

Stainless steel boiler tubes have good high temperature resistance, such as the commonly used 304, 316L and other materials, which can operate stably for a long time at high temperatures. Its anti-oxidation performance is excellent, and it is not easy to be oxidized in high temperature environments. The oxide film formed on the surface can play a certain protective role to prevent further oxidation corrosion. It is suitable for some occasions with high requirements for corrosion resistance and high temperature resistance, but the price is relatively high.

Nickel-based alloy boiler tubes

Nickel-based alloy boiler tubes have excellent high temperature resistance and can be used in high temperature environments above 1000℃. It has good creep resistance and anti-oxidation performance, and can maintain high strength and good toughness at high temperatures. The corrosion resistance is also very good, and it can resist the erosion of various corrosive media at high temperatures, but the cost is high, and it is generally used in extremely harsh working conditions such as high temperature, high pressure, and strong corrosion.

Ceramic composite steel pipes

Ceramic composite steel pipes are made of steel pipes as the matrix, and a layer of ceramic material is compounded on their inner wall. This composite pipe has extremely high high temperature resistance and can withstand temperatures of 1200℃ or even higher. The ceramic layer has good wear resistance and corrosion resistance, and can effectively resist wear and corrosion at high temperatures.

Summary

In addition to the characteristics of the material itself, the high temperature resistance of the boiler tube is also affected by many factors, such as pipe wall thickness, pipe structure, heat transfer method, etc. In the application, it is necessary to select appropriate materials and design schemes according to the actual working conditions to ensure that the boiler tube can operate safely and reliably in a high temperature environment.