Description
Product Description A335 P22 Seamless Pipe
ASTM A335 P22 seamless pipe is an alloy steel pipe composed primarily of chromium and molybdenum. Its seamless construction enhances its ability to withstand high pressure and temperature while ensuring uniform strength along its entire length. The “P22” designation refers to the specific chemical composition of the material, which includes 2.00-2.50% chromium and 0.87-1.13% molybdenum as its primary alloying elements.
Key Features and Advantages
- High-Temperature Resistance: The chromium and molybdenum content in P22 pipes provides excellent resistance to oxidation and scaling at elevated temperatures.
- High-Pressure Tolerance: The seamless construction ensures that the pipes can withstand high-pressure environments without compromising integrity.
- Corrosion Resistance: The alloying elements offer moderate resistance to corrosion, making it suitable for applications in chemically aggressive environments.
- Durability: These pipes exhibit long service life and low maintenance costs, even under severe operating conditions.
- Versatility: P22 pipes can be used in various industries, including power generation, petrochemical, and refineries.
ASTM A335 P22 Seamless Pipe Dimensions
NPS (in) OD (in) SCH 10 (WT/ID) SCH 40 (WT/ID) SCH 80 (WT/ID) SCH 160 (WT/ID) SCH XXS (WT/ID)
1/8 0.405 0.049 / 0.307 0.068 / 0.269 0.095 / 0.215 0.123 / 0.159 0.215 / 0.215
1/4 0.540 0.065 / 0.410 0.088 / 0.364 0.119 / 0.302 0.157 / 0.226 0.302 / 0.302
1/2 0.840 0.083 / 0.674 0.109 / 0.622 0.147 / 0.546 0.187 / 0.466 0.294 / 0.294
3/4 1.050 0.083 / 0.884 0.113 / 0.824 0.154 / 0.742 0.218 / 0.614 0.308 / 0.434
1 1.315 0.109 / 1.097 0.133 / 1.049 0.179 / 0.957 0.250 / 0.815 0.358 / 0.599
1 1/4 1.660 0.109 / 1.442 0.140 / 1.380 0.191 / 1.278 0.250 / 1.160 0.382 / 0.896
1 1/2 1.900 0.109 / 1.682 0.145 / 1.610 0.200 / 1.500 0.281 / 1.338 0.400 / 1.100
2 2.375 0.109 / 2.157 0.154 / 2.067 0.218 / 1.939 0.344 / 1.687 0.436 / 1.503
3 3.500 0.120 / 3.260 0.216 / 3.068 0.300 / 2.900 0.438 / 2.624 0.600 / 2.300
4 4.500 0.120 / 4.260 0.237 / 4.026 0.337 / 3.826 0.531 / 3.438 0.674 / 3.152
6 6.625 0.134 / 6.357 0.280 / 6.065 0.432 / 5.761 0.719 / 5.187 0.864 / 4.897
8 8.625 0.148 / 8.329 0.322 / 7.981 0.500 / 7.625 0.906 / 6.813 1.125 / 6.375
10 10.750 0.165 / 10.420 0.365 / 10.020 0.500 / 9.750 1.250 / 8.250 1.406 / 7.938
12 12.750 0.180 / 12.390 0.375 / 12.000 0.500 / 11.750 1.406 / 9.938 1.562 / 9.625
ASTM A335 P22 Equivalent
| ASTM | A335 P22 |
| ASME | SA335 P22 |
| A335 P22 Equivalent Material | T22, 10CrMo910, 10CrMo9-10, 1.7380, 11CrMo9-10, 1.7383 |
| JIS G 3458 | STPA 24 |
| UNS | K21590 |
| BS | 3604 P1 622 |
| DIN | 17175, 10CrMo910 |
| ISO | 2604 II TS34 |
| ABS | ABS 13 |
| NK | KSTPA 24 |
| LRS | Sec 2, 2-1/4Cr1Mo410 |
A335 P22 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.05 - 0.15 |
| Manganese (Mn) | 0.30 - 0.60 |
| Silicon (Si) | 0.50 max |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Chromium (Cr) | 1.90 - 2.60 |
| Molybdenum (Mo) | 0.87 - 1.13 |
A335 P22 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa (60,200 psi) min |
| Yield Strength | 205 MPa (29,700 psi) min |
| Elongation | 30% min |
| Hardness (Brinell) | 163 HB max |
| Hardness (Rockwell B) | 85 HRB max |
| Impact Energy (Charpy V-Notch) | 27 J (20 ft-lbf) min at -20°C (-4°F) |
Manufacturing Process
The production of A335 P22 seamless pipes involves several critical steps to ensure superior quality and performance:
- Raw Material Selection: High-grade alloy steel billets are selected based on ASTM standards.
- Heating: The billets are heated to a specific temperature to allow deformation.
- Piercing: A rotary piercing mill forms the hollow pipe.
- Rolling: The pipe is rolled to achieve the desired dimensions and thickness.
- Heat Treatment: The pipe undergoes annealing, normalizing, or quenching and tempering to achieve the required mechanical properties.
- Inspection and Testing: Rigorous tests are conducted to ensure compliance with ASTM specifications.
Heat Treatment Requirements
A335 P22 seamless pipes undergo specific heat treatment processes to achieve desired properties:
- Normalizing: Heating the pipe to a temperature above 920°C followed by air cooling.
- Tempering: Reheating the pipe to a temperature between 675°C and 720°C and cooling it under controlled conditions.
- Annealing: Softening the material to improve machinability and ductility.
Testing Standards
To ensure the reliability and quality of A335 P22 seamless pipes, manufacturers perform several tests:
- Hydrostatic Testing: Checks the pipe’s pressure tolerance.
- Ultrasonic Testing (UT): Detects internal defects.
- Hardness Testing: Ensures compliance with specified hardness levels.
- Chemical Analysis: Confirms adherence to chemical composition standards.
- Tensile Testing: Verifies tensile strength and elongation.
- Impact Testing: Assesses the pipe’s toughness at various temperatures.
Benefits of Choosing A335 P22 Seamless Pipe
- Performance in Extreme Conditions: Designed to operate efficiently under high temperatures and pressures.
- Cost-Effectiveness: Offers a balance of initial cost and long-term performance.
- Reliability: Seamless construction minimizes the risk of leaks and failures.
- Global Availability: Widely manufactured and stocked to meet various industrial demands.
Applications
- Power Plants: Used in superheater and reheater tubes, steam lines, and headers.
- Petrochemical Industries: Ideal for fluid catalytic cracking units and reactors.
- Oil and Gas Refineries: Used in heat exchangers, distillation columns, and processing units.
- Boiler and Pressure Vessels: Suitable for boiler tubes and pressure piping.
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