What Is The Material of Burn-resistant Boiler Tubes?

Material of boiler tubes

Boiler tubes are pipes used to transport hot water or steam. The choice of their materials has an important impact on the performance and service life of the boiler. Here are some common choices for the boiler pipe material:

1. Carbon steel

Carbon steel is one of the most commonly used materials in boiler tubes, such as 20G, etc. It has good mechanical properties and welding properties, and has high strength and corrosion resistance. Carbon steel boiler tubes are mainly used to manufacture high-pressure and higher-parameter boiler pipes, such as superheaters, reheaters, economizers, etc.

2. Alloy steel

Alloy steel is a certain amount of one or more alloying elements added to carbon steel to improve certain properties of steel. In boiler tubes, common alloy steels include 15CrMoG, 12Cr1MoVG, etc. These materials have higher strength, hardness and heat resistance, so they perform well in high temperature and high pressure environments. Alloy steel boiler tubes are mainly used in high-temperature and high-pressure working environments, such as boilers with higher steam parameters.

3. Other materials

In addition to carbon steel and alloy steel, stainless steel, copper and copper alloys, and nickel alloys are also used in the manufacture of boiler tubes.

Stainless steel has good corrosion resistance and is often used in water tubes of water storage boilers.

Copper and copper alloys are often used in boiler smoke pipes and some heat exchangers due to their good thermal conductivity and corrosion resistance.

Nickel alloys are suitable for high temperature and high pressure boiler tubes due to their excellent high temperature resistance and corrosion resistance.

The materials of burn-resistant boiler tubes mainly include carbon steel, alloy steel such as 15CrMoG, 12Cr1MoVG, etc., and stainless steel. These materials have good mechanical properties and high temperature resistance, and are suitable for boilers with different working conditions and temperature requirements. The selection of specific materials should be determined according to the actual working conditions, pressure and temperature requirements of the boiler:

1. Carbon steel boiler tubes

It has good mechanical properties and weldability, and is widely used in general industrial boilers and pressure vessels. The price of carbon steel pipes is relatively affordable, and it also shows stable performance at room temperature and medium and high temperatures.

It should be noted that carbon steel may produce graphitization under long-term high temperature environment, so its use temperature is best controlled below 450℃.

2. Alloy steel boiler tubes

In order to improve the high temperature and pressure resistance of boiler tubes, alloy steel materials are widely used in high-pressure and high-temperature boilers.

For example, alloy steel tubes such as 15CrMoG and 12Cr1MoVG can still maintain excellent thermal strength and oxidation resistance in the high temperature range of 500-580℃. The addition of these alloy elements such as chromium and molybdenum enhances the high temperature resistance and corrosion resistance of steel, making alloy steel boiler tubes an ideal choice for high temperature and high pressure environments.

3. Stainless steel boiler tubes

Stainless steel boiler tubes are known for their excellent corrosion resistance and high temperature resistance. This material is particularly suitable for use in corrosive gases or special working environments, such as boilers in chemical plants or coastal areas.

Although the price of stainless steel boiler tubes is relatively high, their excellent performance and long life make the investment return very considerable.

Summary

In summary, the material selection of refractory boiler tubes needs to be determined according to the specific application scenarios and working conditions. Carbon steel boiler tubes are suitable for general industrial boilers, alloy steel boiler tubes are more suitable for high temperature and high pressure environments, and stainless steel boiler tubes are the first choice for corrosive environments and special working conditions. When choosing the material of boiler tubes, factors such as cost, performance, and convenience of maintenance should also be considered.