Alloy seamless steel pipe is a high-performance material widely used in industry and construction. Its main feature is to improve the mechanical properties, corrosion resistance and high temperature resistance of steel pipes by adding different alloy elements, such as chromium, molybdenum, nickel, etc. The following are some common representative alloy seamless steel pipe materials:

ASTM A335 P series:

P5: P5 steel pipe contains 5% chromium and 0.5% molybdenum, has good oxidation resistance and high temperature strength, and is often used in high temperature steam pipelines and petrochemical industry.
P9: P9 steel pipe contains 9% chromium and 1% molybdenum, has higher oxidation resistance and corrosion resistance than P5, and is suitable for high temperature and high pressure environment.
P11: P11 steel pipe contains 1.25% chromium and 0.5% molybdenum, has superior comprehensive performance, and is widely used in high temperature boilers and heat exchangers.
P22: P22 steel pipe contains 2.25% chromium and 1% molybdenum, has high high temperature strength and oxidation resistance, and is often used in high temperature and high pressure pipelines in power plants and petrochemical industry.
P91: P91 steel pipe is a high chromium and high molybdenum steel, containing 9% chromium and 1% molybdenum, and contains trace amounts of vanadium and nitrogen. It has extremely high temperature strength and creep strength and is widely used in supercritical and ultra-supercritical power plants.
ASTM A213 T series:

T11: T11 steel pipe contains 1.25% chromium and 0.5% molybdenum, similar to P11, and is mainly used in high temperature heat exchangers and boilers.
T22: T22 steel pipe contains 2.25% chromium and 1% molybdenum, suitable for high temperature and high pressure environments, and is widely used in power plants and petrochemical industries.
T91: T91 steel pipe is the same as P91, containing 9% chromium and 1% molybdenum, and contains vanadium and nitrogen. It has excellent high temperature strength and creep resistance and is suitable for supercritical and ultra-supercritical power plants.
EN 10216-2:
10CrMo9-10: This is a European standard alloy steel pipe containing chromium and molybdenum, with good high temperature strength and corrosion resistance, commonly used in power plants and petrochemical industries.
Alloy seamless steel pipes greatly improve the comprehensive performance of steel pipes by adding specific alloy elements to steel, and are suitable for various extreme working conditions. P series and T series high chromium and high molybdenum steel pipes, such as P91 and T91, represent the development direction of modern high temperature and high pressure materials and are widely used in supercritical and ultra-supercritical power plants. Selecting the appropriate alloy seamless steel pipe material can not only ensure the safety and stable operation of the project, but also significantly improve the service life and efficiency of the equipment.