A213 T91 Chrome Moly Alloy Heater Tubes
A213T91 alloy tube is a seamless steel tube for high-pressure boilers that meets the ASTM A213/A213M-07a standard. Its chemical composition contains elements such as carbon (0.07-0.13%), chromium (8-9.5%), molybdenum (0.85-1.05%), vanadium (0.18-0.25%), niobium (0.06-0.10%), etc. After normalizing and tempering treatment, it has excellent high-temperature strength, oxidation resistance, and stable and durable plasticity. The design stress of this material at 550 ℃ is twice that of traditional T9 steel, and the allowable stress below 620 ℃ exceeds that of austenitic stainless steel. It is suitable for high-temperature superheaters and reheaters in subcritical/supercritical boilers with wall temperatures ≤ 625 ℃.
T91 seamless steel pipe, as a key material in the fields of power, petrochemicals, and boiler manufacturing, occupies an important position in industrial applications due to its excellent high-temperature strength and corrosion resistance. This material belongs to the martensitic heat-resistant steel under the ASTM A213 standard in the United States, with a corresponding grade of 10Cr9Mo1VNbN in China. Its chemical composition has been carefully designed, with carbon content controlled at 0.08% -0.12% and chromium content at 8.0% -9.5%.
Alloy elements such as molybdenum, vanadium, and niobium have been added, and through solid solution strengthening and precipitation strengthening mechanisms, the steel pipe can maintain excellent creep fracture strength at high temperatures of 600 ℃.
In terms of production technology, T91 is made into seamless tubes using hot rolling or cold drawing processes. The inner and outer surfaces need to undergo strict polishing and acid washing treatment to ensure dimensional accuracy of ± 0.5mm and wall thickness deviation of no more than ± 10%. These characteristics make it widely used in high-pressure components such as superheaters and reheaters in supercritical boilers.
A213 T91 chromium-molybdenum alloy steel pipes supplied by GNEE Group are available in outer diameters from 1/2 inch to 36 inches (DN25 to DN900) and wall thicknesses up to SCH 160. These pipes offer outstanding oxidation resistance, creep strength, and long-term structural stability at high temperatures, making them ideal for demanding applications in power generation, petrochemical, and high-pressure boiler systems. For pricing details, please contact GNEE Group directly.
A23 T91 chromium-molybdenum pipe Chemical composition:
C 0.07%~0.13%
Cr 8.0%~9.5%
Mo 0.85%~1.05%
V 0.18%~0.25%
Nb 0.06%~0.10%.
A213 T91 Low Alloy Steel Tubes Mechanical properties:
Tensile strength at room temperature ≥ 585MPa
non proportional tensile strength specified at 550 ℃ ≥ 376MPa
A23 T91 Chrome Moly Seamless Tubes Heat treatment process:
1040 ± 10 ℃ normalizing insulation for 30 minutes, 760 ± 10 ℃ tempering insulation for 60 minutes
A213 T91 Low Alloy Steel Superheater Tube Hydraulic test:
It is required to pass a 20MPa pressure test and stabilize the pressure for more than 10 seconds without leakage or plastic deformation
Key points of A213 T91 Alloy Steel High Pressure Tube production process
The production of high-quality T91 alloy tubes requires strict metallurgical processes:
1. Smelting process: - Adopting the triple process of electric arc furnace+LF refining+VD vacuum degassing - Controlling oxygen content ≤ 20ppm, sulfur ≤ 0.010% - Adding nitrogen element (0.03-0.07%) to enhance the precipitation strengthening effect
2. Hot processing technology: - perforation temperature of 1150-1200 ℃, final rolling temperature ≥ 900 ℃ - using "controlled rolling and controlled cooling" technology, final cooling speed of 30-50 ℃/s - normalizing temperature of 1040-1080 ℃, tempering temperature of 730-780 ℃
3. Quality control: -100% ultrasonic testing (ASTM A213 standard) - Hardness control 180-250HBW - Grain size requirement grade 5-8 (ASTM E112)
A213 T91 Chrome Moly Alloy Heater Tubes Main application areas
1. Power industry: - Superheater and reheater of supercritical/ultra supercritical boilers - Main steam pipeline (design temperature ≤ 625 ℃) - High pressure steam guide pipe of steam turbine - Statistics show that a single boiler requires about 800 tons of T91 pipes
2. Petrochemical industry: - Hydrocracking unit reactor delivery pipe - Ethylene cracking furnace convection section furnace pipe - Synthetic ammonia unit conversion gas pipeline
3. Nuclear power field: - Fast neutron breeder reactor secondary loop steam generator - High temperature gas cooled reactor helium conduit
A213 T91 heat exchanger tubes for high temperature factory
A213 T91 Chrome Moly Alloy Heater Tubes Packaging and shipping
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