Introduction to high-quality carbon structural steel and alloy structural steel seamless steel pipes for high-pressure and above steam boiler pipelines

GB/T5310 standard seamless steel pipes are high-quality products designed for high-pressure and above steam boiler pipelines. They are made of high-quality carbon structural steel and alloy structural steel materials to ensure their excellent performance and reliability in high-temperature and high-pressure environments. This seamless steel pipe is widely used in the manufacture of boiler pipelines and heat exchangers, providing a solid guarantee for industrial production.

Main grades

GB/T5310 standard seamless steel pipes are mainly made of Cr-Mo alloy and Mn alloy, and the main grades include 20G, 20Mg, 20MoG, 12CrMoG, etc. These materials have excellent high-temperature strength and oxidation resistance, and can be used for a long time in harsh working environments without failure. Among them:

20G: A high-quality carbon structural steel with good plasticity and toughness, commonly used in medium and low-pressure boiler pipelines.
20Mg: Adding manganese to 20G further improves the strength and hardness of the material, suitable for medium and high-pressure boiler pipelines.
20MoG: Molybdenum is added to 20G, which greatly improves the heat resistance and creep resistance, and is suitable for high-pressure boiler pipes.
12CrMoG: Alloy structural steel containing chromium and molybdenum, with excellent high-temperature oxidation resistance and high-temperature strength, suitable for ultra-high-pressure boiler pipes.
Alloy structural steel grades

The alloy structural steel grades of GB/T5310 standard seamless steel pipes also include 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, etc. These grades of steel pipes have different mechanical properties and applicable ranges according to different chemical compositions and heat treatment processes:

15MoG and 20MoG: The addition of an appropriate amount of molybdenum significantly improves the high-temperature strength and corrosion resistance of the steel pipe.
12CrMoG and 15CrMoG: The addition of chromium and molybdenum enhances the oxidation resistance and high-temperature strength of the steel pipe, and is suitable for environments with higher temperatures and pressures.
12Cr2MoG and 12CrMoVG: The alloy composition is further optimized, with both high temperature strength and oxidation resistance, and performs particularly well in extreme environments.
Applications
GB/T5310 standard seamless steel pipes are widely used in boiler pipes and heat exchangers, mainly in high temperature and high pressure equipment such as power station boilers, industrial boilers, and waste heat boilers. These seamless steel pipes can withstand extremely high working pressures and temperatures, ensuring efficient operation and long life of boilers and heat exchangers. In addition, these steel pipes are also used in heat exchange equipment in the petrochemical industry, further expanding their application areas.
Summary
GB/T5310 standard seamless steel pipes have become the preferred product for high pressure and above steam boiler pipes due to their excellent material properties and wide range of applications. Whether it is 20G, 20Mg, 20MoG, 12CrMoG and other materials, or 15MoG, 20MoG, 12CrMoG and other alloy structural steel grades, they all demonstrate excellent high temperature oxidation resistance and high temperature strength, providing reliable guarantees for the safe and efficient operation of industrial equipment.