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ASTM A335 P22 pipe, also known as ASME SA335 P22 seamless pipe, is a premium chromium-molybdenum alloy steel pipe engineered for critical high-temperature and high-pressure applications. Its unique composition, featuring chromium for oxidation resistance and molybdenum for enhanced strength, delivers superior performance in demanding environments like power generation, refineries, and petrochemical plants. Compared to carbon steel, P22 pipe offers exceptional resistance to creep and thermal fatigue, making it the preferred choice for superheater tubes, steam pipelines, heat exchangers, and process piping systems operating at temperatures exceeding 540°C.
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What is ASTM A335 p22 pipe
ASTM A335 P22 pipe is a high-performance seamless alloy steel pipe specifically designed for extreme service conditions. Renowned for its excellent high-temperature strength and resistance to oxidation and creep, SA335 P22 is a critical material in power plants and refineries for applications such as boiler tubes and steam lines. Its robust chromium-molybdenum composition ensures long-term reliability under prolonged exposure to heat and pressure.
P22 Pipe Specification (ASTM A335 Standard)
| A335 P22 Alloy Steel Seamless Pipes Specification | ASTM A335 / ASME SA335 |
| A335 P22 Alloy Steel Seamless Pipes Grades | ASTM A335 P5, ASTM A335 P9, ASTM A335 P11, ASTM A335 P22, ASTM A335 P91, ASME SA335 P5, ASME SA335 P9, ASME SA335 P11, ASME SA335 P22, ASME SA335 P91 |
| A335 P22 Alloy Steel Seamless Pipes Type | Seamless - Hot Rolled / Cold Drawn |
| A335 P22 Alloy Steel Seamless Pipes Outer Diameter Size | A335 - 3/8" NB to 30" NB (Nominal Bore Size) |
| A335 P22 Alloy Steel Seamless Pipes Wall Thickness | Schedule 20 to Schedule XXS (Heavier On Request) Up to 250 mm Thickness |
| A335 P22 Alloy Steel Seamless Pipes Length | 5 to 7 Meters, 09 to 13 Meters, Single Random Length, Double Random Length And Customize Size. |
| A335 P22 Alloy Steel Seamless Pipes Ends | Plain Ends / Beveled Ends / Coupling |
| A335 P22 Alloy Steel Seamless Pipes Delivery Conditions | As Rolled, Cold Drawn, Normalizing Rolled, Thermomechanical Rolled / Formed, Normalizing Formed, Normalized and Tempered / Quenched and Tempered - BR / N / Q /T |
| A335 P22 Alloy Steel Seamless Pipes Coating | Epoxy Coating / Colour Paint Coating / 3LPE Coating. |
| A335 P22 Alloy Steel Seamless Pipes Other Testing | Tensile Test, Transverse Tension Tests, Flattening Test, Metal Structure and Etching Tests, Photomicrographs, Hardness Tests, etc. |
| A335 P22 Alloy Steel Seamless Pipes Dimension | All Pipes Is Manufactured and Inspected / Tested to the Relevant Standards including ASTM, ASME, API. |
| A335 P22 Alloy Steel Seamless Pipes Value Added Services | Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Galavanizing / Heat Treatment |
| A335 P22 Alloy Steel Seamless Pipes Packaging | Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector |
| A335 P22 Alloy Steel Seamless Pipes Shipment & Transportation | By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / 45 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes |
| A335 P22 Alloy Steel Seamless Pipes Material Test Certificate | Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC |
ASTM A335 P22 Alloy Steel Seamless Pipes chemical compositions
| Grade | P-22 | |
| Element | UNS Designation | K21590 |
| Carbon | 0.15 max | 0.08 – 0.12 |
| Manganese | 0.30 – 0.60 | 0.30 – 0.60 |
| Phosphorous, max | 0.025 | 0.020 |
| Sulfur, max | 0.025 | 0.010 |
| Silicon | 0.50 max | 0.20 -0.50 |
| Chromium | 4.00 – 6.00 | 8.00 – 9.50 |
| Molybdenum | 0.45 -0.65 | 0.85 – 1.05 |
ASTM A335 P22 Alloy Steel Seamless Pipes tensile test
| Seamless | |
| P-22 | |
| Tensile Strength, min., psi | |
| ksi | 60 |
| MPa | 415 |
| Yield Strength, min., psi | |
| ksi | 30 |
| MPa | 205 |
ASTM A335 P22 pipes other mechanical test
| Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test | |
| For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot. for small lots, at least one pipe shall be tested. | |
| For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe. | |
| Notes for Hardness Test: | P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC]. |
| Notes for Bend Test: | For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test. |
| Other ERW pipe or pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser. | |
| The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion. | |
| The inside diameter of the bend shall be 1 inch [25 mm]. | |
| Hydrostatic test | Each length of pipe shall be Hydro tested, at option of manufacture, nondestructive electric testing can be used. |
ASTM A335 P22 Alloy Steel pipes elongation requirement
| Calculated Minimum Elongation Values | ||||
| Elongation in 2 in. or 50 mm, min % | ||||
| Wall Thickness | P5, P9, P11, P22 | P91 | ||
| in. | mm | Longitudinal | Transverse | Longitudinal |
| 5/16 (0.312) | 8 | 30 | 20 | 20 |
| 9/32 (0.281) | 7.2 | 28 | 19 | 19 |
| 1/4 (0.250) | 6.4 | 27 | 18 | 18 |
| 7/32 (0.219) | 5.6 | 26 | 17 | |
| 3/16 (0.188) | 4.8 | 24 | 16 | |
| 5/32 (0.156) | 4 | 22 | 15 | |
| 7/8 (0.125) | 3.2 | 21 | 14 | |
| 3/32 (0.094) | 2.4 | 20 | 13 | |
| 1/18 (0.062) | 1.6 | 18 | 12 | |
DIMENSION TABLE (Metric + Imperial)
| NPS (inch) | DN (mm) | OD (mm) | Wall Thickness (SCH40) | Wall Thickness (SCH80) |
|---|---|---|---|---|
| 1/2" | DN15 | 21.3 | 2.77 mm | 3.73 mm |
| 1" | DN25 | 33.4 | 3.38 mm | 4.55 mm |
| 2" | DN50 | 60.3 | 3.91 mm | 5.54 mm |
| 4" | DN100 | 114.3 | 6.02 mm | 8.56 mm |
| 8" | DN200 | 219.1 | 8.18 mm | 12.7 mm |
P22 vs P11 vs P91
| Grade | Cr-Mo Content | Temperature Resistance | Application |
|---|---|---|---|
| P11 | 1.25Cr-0.5Mo | Medium | Low-pressure boiler |
| P22 | 2.25Cr-1Mo | High | Power plant & refinery |
| P91 | 9Cr-1Mo | Very High | Ultra-supercritical systems |
👉 P22 is the best balance between cost and high-temperature performance
ASTM A335 P22 PIPE PRICE FACTORS
Price depends on:
Pipe size (OD & thickness)
SCH40 / SCH80 / SCH160
Steel price fluctuation (Cr & Mo content impact)
Heat treatment condition
Order quantity
Inspection requirements (UT / RT / Hydro test)
Frequently Asked Questions (FAQ): ASTM A335 P22 / ASME SA335 P22 Chrome-Moly Alloy Seamless Pipe
Q1: What is the primary use case for ASTM A335 P22 pipe compared to other grades like P11?
A: ASTM A335 P22 is a chromium-molybdenum alloy steel pipe designed for high-temperature service. Its key advantage over P11 is its higher alloy content, which provides superior creep strength and oxidation resistance at elevated temperatures (typically up to 1100°F / 595°C). It is the standard material for high-temperature, high-pressure sections in power plant boilers (e.g., superheaters, reheater tubes, and steam lines) and critical piping in refineries and chemical plants.
Q2: What is the chemical composition of ASTM A335 P22?
A: The typical chemical composition is:
Chromium (Cr): 2.00% - 2.50%
Molybdenum (Mo): 0.87% - 1.13%
Carbon (C): 0.05% - 0.15%
Manganese (Mn): 0.30% - 0.60%
Phosphorus (P): 0.025% max
Sulfur (S): 0.025% max
Silicon (Si): 0.50% max
This 2.25Cr-1.0Mo composition is the industry standard for many high-temperature pressure applications.
Q3: What are the key mechanical properties of A335 P22 pipe?
A: The minimum required mechanical properties as per the standard are:
Tensile Strength: 415 MPa (60,000 psi) min
Yield Strength: 205 MPa (30,000 psi) min
Hardness: Typically up to 250 HBW (Brinell Hardness)
Q4: We need matching components for a P22 piping system. What are the relevant standards?
A: For a complete and compatible P22 system, the following standards apply:
Pipe Fittings (Elbows, Tees, Caps): ASTM A234 WP22
Flanges & Forged Fittings: ASTM A182 F22
Equivalent Steel Plate: ASTM A387 Grade 22
Welded Pipe from Plate: ASTM A691 2-1/4CR
Q5: How critical is heat treatment for A335 P22 material?
A: Extremely critical. All A335 P22 pipe is supplied in the normalized and tempered condition. This heat treatment is essential to develop the required microstructure (tempered bainite) that provides the optimal combination of high-temperature strength and toughness. Fabricated components must also undergo post-weld heat treatment (PWHT).
Q6: What are the key welding considerations for P22 pipe?
A: Welding P22 requires strict procedure control:
Pre-heat: Mandatory, typically in the range of 400-500°F (200-260°C).
Post-Weld Heat Treatment (PWHT): Absolutely required. PWHT is performed at temperatures around 1250±25°F (675±15°C) to temper the weld metal and Heat-Affected Zone (HAZ), reducing residual stresses and restoring toughness.
Filler Metal: Common choices include ER90S-B3 for TIG/MIG and E9018-B3 for SMAW.
Q7: Can A335 P22 be substituted for P11 in an existing design?
A: Not without proper engineering review. While P22 has superior high-temperature properties, it has different thermal expansion characteristics and strength levels. Substitution must be approved by a design engineer through a formal code calculation (e.g., ASME B31.1 or B31.3) to ensure the system's integrity under all operating conditions.
Q8: What certifications and testing do you provide?
A: We supply A335 P22 pipe with a full Material Test Certificate (MTC) conforming to EN 10204 3.1/3.2, which validates compliance with the ASTM standard. This includes certified results for chemical analysis, tensile tests, and hardness tests. Standard hydrostatic testing is included, and additional NDE (Ultrasonic Test, Dye Penetrant Test) is available upon request.
Q9: What are your standard size ranges and delivery terms?
A: We supply A335 P22 in a comprehensive range from NPS 1/8" to NPS 24", covering all standard schedules (SCH 40, 80, 160, XXS) and custom wall thicknesses. Delivery terms are typically FCA (Free Carrier) or EXW (Ex Works), with CIF/FOB options available for international orders.
Q10: Does your P22 material comply with international pressure equipment directives?
A: Yes. Our products and documentation are designed to support compliance with major international codes and directives, including the ASME Boiler & Pressure Vessel Code, the European Pressure Equipment Directive (PED 2014/68/EU), and the German TÜV AD2000-Merkblätter, ensuring global project acceptance.
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