12Cr2MoG High-pressure Boiler Tube

12Cr2MoG high-pressure boiler tube is a seamless pipe specially used in high-temperature and high-pressure environments. It is widely used in power, petroleum, chemical and nuclear industries. It is mainly used to manufacture high-pressure boiler bodies and key components such as superheaters and reheaters, which directly affect the safety and operating efficiency of equipment.

12Cr2MoG high-pressure boiler tubes not only withstand the high-pressure impact of steam and medium, but also need to resist creep and corrosion under long-term high temperature. Therefore, there are strict requirements in production process, chemical composition and heat treatment. The following will systematically introduce the key points of 12Cr2MoG high-pressure boiler tubes from the aspects of manufacturing process, material characteristics and application fields.

Production process

1. Smelting

In order to obtain pure molten steel and good metallurgical quality, electric furnace or converter molten steel should be used, and it should be guaranteed by strictly controlling the amount of flux and deoxidizer, and accurately performing steelmaking operations.

2. Continuous casting

12Cr2MoG high-pressure boiler tubes adopt headless continuous casting or intermediate tank pouring technology to ensure the temperature and temperature uniformity of the ingot to reduce defects and improve product quality.

3. Rolling

12Cr2MoG high-pressure boiler tubes are rolled by multi-stand rolling mills. According to different specifications and performance requirements, different temperatures and reductions are used for rolling. The rolling temperature and reduction have a great influence on the dimensional accuracy, performance and organizational structure of the steel pipe.

4. Heat treatment

12Cr2MoG high-pressure boiler tubes are normalized or tempered to obtain the required organization and performance. The heat treatment process includes three stages: heating, insulation and cooling. The appropriate process needs to be selected according to the specifications, materials and uses of the steel pipe.

Material features

1. Composition advantages

12Cr2MoG contains about 0.12%C, 2%Cr, 0.25%Mo, and a small amount of alloying elements such as Si, Mn, V, and Nb, which effectively improves high-temperature strength and creep resistance.

2. High temperature performance

12Cr2MoG high pressure boiler tubes can still maintain good yield strength and creep resistance at 550℃～600℃, suitable for supercritical and ultra-supercritical boilers.

3. Anti-oxidation and corrosion resistance

Chromium elements form a dense oxide film on the tube surface, effectively blocking oxidation diffusion; Mo elements further enhance the ability to resist sulfidation corrosion.

4. Organization stability

After reasonable heat treatment, 12Cr2MoG high pressure boiler tubes have fine and uniform organization, low internal stress, and excellent thermal fatigue resistance.

Application areas

1. Power industry

12Cr2MoG high pressure boiler tubes can be used in the main steam pipes, superheaters, and reheater tube bundles of supercritical/ultra-supercritical thermal power generation boilers.

2. Petrochemicals

12Cr2MoG high pressure boiler tubes are used for high pressure reactor, heat exchanger tube, and pipeline for transporting high temperature and high pressure corrosive media.

3. Nuclear industry

12Cr2MoG high-pressure boiler tubes can be used in the primary and secondary circuit high-temperature and high-pressure piping systems of nuclear power plants.

Summary

12Cr2MoG high-pressure boiler tubes have become the preferred material for modern supercritical and ultra-supercritical boilers due to their excellent high-temperature strength, oxidation resistance and corrosion resistance. To give full play to its performance advantages, it is necessary to strictly control the smelting and refining, continuous casting and soaking, rolling deformation and heat treatment processes to meet the stringent requirements of high-temperature and high-pressure equipment for pipes and ensure the safe and stable operation of the equipment.