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ASTM A335 /A335M covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high-temperature service.
ASTM A 999/A999M specification for general requirements for alloy and stainless-steel pipe
E92 Test method for Vickers hardness of metallic materials
E213 practice for ultrasonic testing of metal pipe and tubing
E309 practice for Eddy-Current examination of steel tubular products using magnetic saturation
E381 method of macro etch testing steel bars, billets, blooms, and forgings
| Grade | C | Mn | P | S | Si | Cr | Mo | V | Nb | N | Al | Others |
| P11 | 0.05-0.15 | 0.30-0.60 | ≤0.025 | ≤0.025 | 0.50-1.00 | 1.0-1.50 | 0.44-0.65 | / | / | / | / | / |
| P12 | 0.05-0.15 | 0.30-0.61 | ≤0.025 | ≤0.025 | ≤0.50 | 0.80-1.25 | 0.45-0.65 | / | / | / | / | / |
| P22 | 0.05-0.15 | 0.30-0.60 | ≤0.025 | ≤0.025 | ≤0.50 | 1.90-2.60 | 0.87-1.13 | / | / | / | / | / |
| P91 | 0.08-0.12 | 0.30-0.60 | ≤0.020 | ≤0.010 | 0.20-0.50 | 8.0-9.50 | 0.85-1.05 | 0.18-0.25 | 0.030-0.070 | ≤0.40 | ≤0.02 | Cb 0.06-0.10 Ti 0.01max Zr 0.01max |
Grade | P11 | P12 | P22 | P91 |
UNS Number | K11597 | K11562 | K21590 | K91560 |
Heat Treat Type | full or isothermal anneal normalize and temper | full or isothermal anneal normalize and temper subcritical anneal | full or isothermal anneal normalize and temper | normalize and temper quench and temper |
Austenitizing/ Solutioning Temperature, min or range °F [°C] | … | … | … | 1900-1975[1040-1080] 1900-1975[1040-1080] |
Subcritical Annealing or Tempering Temperature, Min or range °F [°C] | 1200 [650] | 1200 [650] 1200-1300 [650 to 705] | 1250 [675] | 1350-1470[730-800] 1350-1470[730-800] |
Grade | Tensile | Yield | Elongation | Hardness |
Strength (Mpa) | Strength (Mpa) | (%) | ||
P11 P12 | ≥415 | ≥220 | ≥30 | ≤89HRB |
P22 | ≥415 | ≥200 | ≥30 | ≤89HRB |
P91 | ≥585 | ≥415 | ≥20 | 91HRB-25HRC |
Flattening Test—One flattening test shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot
Flaring Test—One flaring test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot
Hydrostatic or Nondestructive Electric Test—Each tube shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.
Optimal for Elevated Temperatures: Grade P91 alloy steel is specifically designed for high-temperature service, maintaining its strength and stability even at extreme temperatures.
Creep Resistance: The material’s excellent creep resistance ensures long-term reliability in applications like power generation and petrochemical processing.
Seamless Construction: The seamless design of these pipes and tubes minimizes the risk of internal corrosion, enhancing the longevity of the equipment.
Chemical Stability: Grade P91’s chemical composition provides excellent resistance to various corrosive environments, making it suitable for a wide range of industrial applications.
Ease of Welding: These pipes and tubes are designed to be easily welded, allowing for efficient installation and maintenance.
Fabrication Flexibility: The material’s properties enable it to be fabricated into complex shapes and designs, meeting specific project requirements.
High Strength: With a high tensile strength, P91 alloy steel is capable of withstanding high pressures and mechanical stresses.
Toughness: The material’s toughness ensures resistance to shock and vibration, crucial for maintaining structural integrity in demanding environments.
Power Generation: Ideal for boiler tubes, superheaters, and reheaters in power plants.
Petrochemical Industry: Used extensively in refineries and chemical plants for process piping and equipment components.
Xintongda Special Steel’s Astm A335 Grade P91 Alloy Steel Seamless Pipes And Tubes offer unparalleled performance in high-pressure, high-temperature environments. Trust in our products to deliver excellence in quality and durability for your most challenging industrial applications.
