Delivering High Quality Stainless Steel and Alloy Piping Products — Pipes, Tubes, Fittings, Flanges and more for Global Industries.
sales@savoypipinginc.com
Delivering High Quality Stainless Steel and Alloy Piping Products — Pipes, Tubes, Fittings, Flanges and more for Global Industries.
sales@savoypipinginc.com
Savoy Piping Inc. supplies ASTM A335 P22 / ASME SA335 Grade P22 seamless chrome moly pipe — the 2.25Cr-1Mo grade (UNS K21590) that remains a workhorse for hotter steam systems in subcritical power plants and many high-temperature process units.
P22 is the grade many EPC and boiler teams reach for when P11 is no longer comfortable on metal temperature or allowable stress, but the design has not yet moved into CSEF 9Cr territory (P91/P92). Think main steam, hot reheat, and high-temperature headers where oxidation resistance and creep strength both matter.
Procurement reality: heavy-wall schedules, correct heat treatment (normalise + temper), hardness control after welding/PWHT, and clean MTC chemistry are what keep P22 packages moving through inspection. We support EN 10204 3.1 / 3.2 certificates, optional IBR Form III-C, and third-party inspection.
Browse related grades: P11, P5, P9, P91, P92, and tube grade ASTM A213 T22.
Also see: Alloy steel seamless hub · Chrome moly hub · Alloy buttweld.
| Choose | When | Watch-outs |
|---|---|---|
| P22 | Main steam / hot reheat / hotter process | Follow design metal temperature |
| P11 | Lower/intermediate chrome-moly duty | Easier weldability in many shops |
| P91 | When creep strength of CSEF is specified | Different chemistry & hardness window |
ASTM A335 / ASME SA335 P22 seamless NPS: ____ Sch/wall: ____ Length: ____ Qty: ____ HT: N&T IBR: Y/N MTC: 3.1/3.2 Destination: ____
Email to sales@savoypipinginc.com with destination and any IBR / NACE / TPI notes.
| A335 P22 Alloy Steel Seamless Pipes Specification | ASTM A335 / ASME SA335 |
| A335 P22 Alloy Steel Seamless Pipes Grades | ASTM A335 / ASME SA335 Grade P22 (2.25Cr-1Mo) |
| 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 / 4 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 / ASME SA335 Grade P22 is seamless ferritic alloy-steel pipe for high-temperature service with approximately 2.25% chromium and 1% molybdenum. The extra chromium versus P11 improves oxidation resistance; the higher molybdenum supports elevated-temperature strength and creep performance in steam service.
A335 P22 pipe is specified for bending, flanging, forming, and fusion welding. It is widely used in power generation for hotter steam lines and headers, and also appears in petrochemical high-temperature piping classes. Selection must follow code allowable stresses and the project’s design metal temperature — P22 is not automatically interchangeable with P11 or P91.
In the chrome moly family, P22 sits above P11 for temperature capability and below the CSEF grades P91 / P92, which are used when supercritical / ultra-supercritical creep design requires 9Cr modified steels.
Choose P22 when steam or process metal temperatures push beyond comfortable P11 duty and the design still uses conventional 2.25Cr-1Mo. Stay with P11 for many economiser / IP / cooler header applications. Move to P91 or P92 for creep-strength-enhanced supercritical steam systems where thinner walls or higher allowable stresses are required. Matching tube: A213 T22.
Heat-analysis composition limits for seamless pipe ordered as Grade P22 (UNS K21590). Values below are mass percent; confirm against the ASTM A335 / ASME SA-335 edition on the purchase order.
| Element | Composition, % |
|---|---|
| Carbon | 0.05–0.15 |
| Manganese | 0.30–0.60 |
| Phosphorus, max | 0.025 |
| Sulfur, max | 0.025 |
| Silicon, max | 0.50 |
| Chromium | 1.90–2.60 |
| Molybdenum | 0.87–1.13 |
| Seamless | |
| P-22 | |
| Tensile Strength, min., psi | |
| ksi | 60 |
| MPa | 415 |
| Yield Strength, min., psi | |
| ksi | 30 |
| MPa | 205 |
| 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. |
| P5, P9, P11, and P22 | |||
| Grade | Heat Treatment Type | Normalizing Temperature Range F [C] | Subcritical Annealing or Tempering Temperature Range F [C] |
| P22 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] |
| NPS [DN] Designator | Tolerance, % from Specified | |
| Over | Under | |
| 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios | 20.0% | 12.5% |
| Above 2 1/2 [65], t/D or = 5% | 22.5% | 12.5% |
| Above 2 1/2 [65], t/D 5% | 15.0% | 12.5% |
| (t = Specified Wall Thickness; D = Specified Outside Diameter) | ||
| 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 | |
Outside Diameter at any point shall not vary from standard specified more than:
| NPS [DN] Designator | Over | Under | ||
| in. | mm | in. | mm | |
| 1/8 to 1 1/2 [6 to 40], incl. | 1/64 (0.015) | 0.40 | 1/64 (0.015) | 0.40 |
| Over 1 1/2 to 4 [40 to 100], incl. | 1/32 (0.031) | 0.79 | 1/32 (0.031) | 0.79 |
| Over 4 to 8 [100 to 200], incl. | 1/16 (0.062) | 1.59 | 1/32 (0.031) | 0.79 |
| Over 8 to 12 [200 to 300], incl. | 3/32 (0.093) | 2.38 | 1/32 (0.031) | 0.79 |
| Over 12 [300] | +/- 1% of the specified outside diameter | |||
(On Tags attached to each Bundle in case of Bundled Pipe) Markings will adhere to prescribed specifications in A 999/A999M and be: Rolled, Stamped, or Stenciled (Mfrs. Option)
| In addition, markings will include: | |||||||||||||||||||||||||
| Length of pipe |
|
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| Schedule Number | |||||||||||||||||||||||||
| Heat Number or Manufacturer’s number by which heat can be identified | |||||||||||||||||||||||||
| An Additional Symbol “S” if the pipe conforms to any Supplementary Requirements | |||||||||||||||||||||||||
| S1 – Product Analysis | |||||||||||||||||||||||||
| S2 – Transverse Tension Test | |||||||||||||||||||||||||
| S3 – Flattening Test | |||||||||||||||||||||||||
| S4 – Metal Structure and Etching Tests | |||||||||||||||||||||||||
| S5 – Photomicrographs | |||||||||||||||||||||||||
| S6 – Photomicrographs for Individual Pieces | |||||||||||||||||||||||||
| S7 – Alternative Heat Treatment – Grade P91 | |||||||||||||||||||||||||
| Pipe that has been weld repaired shall be marked “WR”. | |||||||||||||||||||||||||
Orders for material under this specification should include the following, as required, to describe the desired material adequately:
| Quantity | Feet, meters, or number of lengths |
| Name of material | Seamless Alloy Steel Pipe |
| Grade | P5, P9, P11, P22, P91 |
| Manufacturer | Hot-finished or cold-drawn |
| Size using one of the following: | |
| NPS and Schedule Number | |
| Outside Diameter and Nominal Wall Thickness | |
| Outside Diameter and Minimum Wall Thickness | |
| Inside Diameter and Nominal Wall Thickness | |
| Inside Diameter and Minimum Wall Thickness | |
| Length | Specific or Random |
| End Finish | |
ASTM A335 P22 (2.25Cr-1Mo) seamless pipe is commonly used for main steam, hot reheat, high-temperature headers, and other elevated-temperature power and process piping where higher Cr-Mo performance than P11 is required.
P22 has higher chromium and molybdenum than P11, so it generally performs better as temperature and creep demand rise. Many projects use P11 for intermediate headers and P22 for hotter steam lines. Follow the piping class and ASME allowable stress tables rather than substituting on habit.
For Indian boiler installations under IBR, purchasers often specify ASME SA335 Grade P22 with Form III-C certification. Standard EN 10204 3.1 alone may not satisfy the boiler inspector — confirm the documentation package before ordering.
Savoy Piping Inc. supplies ASTM A335 / ASME SA335 P22 seamless pipe across common NPS ranges (typically 3/8" to 30" NB) and schedules SCH 20 through XXS, with heavier walls available on request, plain or beveled ends.
We supply this product for domestic and export projects with mill test certificates (EN 10204 3.1 standard; 3.2 / TPI on request). Include destination, preferred Incoterms and any inspection body on the RFQ.