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
| Choose | When | Watch-outs |
|---|---|---|
| P5 | Refinery heater / sulfidation chrome-moly | Confirm HT + hardness |
| P9 | Higher Cr sulfidation service | Different weld procedure |
| P11 | Intermediate steam / headers | Lower Cr than P5/P9 |
ASTM A335 / ASME SA335 P5 seamless NPS: ____ Sch/wall: ____ Qty: ____ HT: N&T IBR: Y/N MTC: 3.1/3.2 Destination: ____
Email sales@savoypipinginc.com with destination and any IBR / NACE / TPI notes.
Savoy Piping Inc. stocks and supplies ASTM A335 P5 / ASME SA335 Grade P5 seamless ferritic alloy-steel pipe — the classic 5Cr-0.5Mo chrome moly grade (UNS K41545) specified where carbon steel cannot hold oxidation or sulfidation resistance in hot hydrocarbon service.
If you are buying P5 for a heater transfer line, furnace outlet, or high-temperature process loop, you usually need more than a generic “alloy pipe” description. Buyers ask for wall schedule, heat-treatment condition, hardness, and whether the mill can support IBR / Form III-C documentation for boiler-linked systems. That is the practical side of this grade — and where we focus our supply.
Where P5 fits: refinery heaters, crude and vacuum unit hot piping, petrochemical process lines, and other elevated-temperature duties where 5% chromium improves scale and sulfidation resistance over lower Cr-Mo grades. Compared with P11 or P22 (common in power steam systems), P5 is still the refinery workhorse for many heater and transfer applications.
We supply P5 alongside the full chrome moly family — P9, P11, P22, P91, P92 — and matching tube grades under ASTM A213. Pipe is offered hot-finished or cold-drawn seamless, in common ASME B36.10 sizes, with EN 10204 3.1 / 3.2 MTCs and third-party inspection on request.
Also see: Alloy steel seamless hub · Chrome moly hub · Alloy buttweld.
| A335 P5 Alloy Steel Seamless Pipes Specification | ASTM A335 / ASME SA335 |
| A335 P5 Alloy Steel Seamless Pipes Grades | ASTM A335 / ASME SA335 Grade P5 (5Cr-0.5Mo) |
| A335 P5 Alloy Steel Seamless Pipes Type | Seamless - Hot Rolled / Cold Drawn |
| A335 P5 Alloy Steel Seamless Pipes Outer Diameter Size | A335 - 3/8" NB to 30" NB (Nominal Bore Size) |
| A335 P5 Alloy Steel Seamless Pipes Wall Thickness | Schedule 20 to Schedule XXS (Heavier On Request) Up to 250 mm Thickness |
| A335 P5 Alloy Steel Seamless Pipes Length | 5 to 7 Meters, 09 to 13 Meters, Single Random Length, Double Random Length And Customize Size. |
| A335 P5 Alloy Steel Seamless Pipes Ends | Plain Ends / Beveled Ends / Coupling |
| A335 P5 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 P5 Alloy Steel Seamless Pipes and ERW pipe Coating | Epoxy Coating / Colour Paint Coating / 3LPE Coating. |
| A335 P5 Alloy Steel Seamless Pipes Other Testing | Tensile Test, Transverse Tension Tests, Flattening Test, Metal Structure and Etching Tests, Photomicrographs, Hardness Tests, etc. |
| A335 P5 Alloy Steel Seamless Pipes Dimension | All Pipes Is Manufactured and Inspected / Tested to the Relevant standards including ASTM, ASME, API. |
| A335 P5 Alloy Steel Seamless Pipes Value Added Services | Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Galavanizing / Heat Treatment |
| A335 P5 Alloy Steel Seamless Pipes Packaging | Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector |
| A335 P5 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 P5 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 P5 is a seamless ferritic alloy-steel pipe for high-temperature service. The chemistry is built around roughly 5% chromium and 0.5% molybdenum. Chromium improves oxidation and high-temperature corrosion resistance; molybdenum supports creep strength and resists softening in service.
Pipe ordered to A335 must be suitable for bending, flanging (vanstoning), similar forming, and fusion welding. Final grade selection always depends on design metal temperature, pressure, corrosion environment, and fabrication practice — not just the P-number on the PO.
In refinery language, P5 is often chosen for heater tubes and hot transfer lines exposed to sulfur-bearing process streams. When sulfidation risk is higher, projects frequently step up to ASTM A335 P9 (9Cr-1Mo). For boiler and power piping at moderate steam temperatures, P11 and P22 remain more common.
P5 (5Cr-0.5Mo) sits between low-chrome power grades and higher-chrome refinery grades. Choose P5 when you need better sulfidation/oxidation resistance than P11/P22 but do not yet need the higher chromium of P9. Choose P9 for more aggressive high-temperature sulfur service. Choose P11 / P22 for most subcritical power-plant steam headers and main steam lines. For supercritical creep-critical steam systems, look at P91 or P92.
Heat-analysis composition limits for seamless pipe ordered as Grade P5 (UNS K41545). Values below are mass percent; confirm against the ASTM A335 / ASME SA-335 edition on the purchase order.
| Element | Composition, % |
|---|---|
| Carbon, max | 0.15 |
| Manganese | 0.30–0.60 |
| Phosphorus, max | 0.025 |
| Sulfur, max | 0.025 |
| Silicon, max | 0.50 |
| Chromium | 4.00–6.00 |
| Molybdenum | 0.45–0.65 |
| Seamless | |
| P-5 | |
| 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 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] |
| P5 (b,c) | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| Subcritical Anneal (P5c only) | ***** | 1325 – 1375 [715 – 74] |
| 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 P5 (5Cr-0.5Mo) seamless pipe is used mainly in refinery and petrochemical high-temperature piping — heater transfer lines, hot oil circuits, and process lines where oxidation and sulfidation resistance matter more than in carbon steel or low-chrome grades.
Yes for practical procurement. ASTM A335 Grade P5 and ASME SA335 Grade P5 share the same chemistry and mechanical intent. For IBR boiler work in India, purchasers often write SA335 P5 and ask for Form III-C certification in addition to the mill test certificate.
P5 has roughly 5% chromium; P9 has roughly 9% chromium with higher molybdenum. P9 generally offers stronger resistance in more severe high-temperature sulfidation environments, while P5 remains widely specified for many heater and transfer services.
We supply ASTM A335 / ASME SA335 P5 seamless pipe typically from about 3/8" NB to 30" NB across common schedules (SCH 20 through XXS, heavier walls on request), in single or double random lengths or cut-to-length, with plain or beveled ends.
We supply this product for domestic and export projects with MTC (EN 10204 3.1 standard; 3.2 / TPI on request). Include destination, Incoterms and inspection needs on the RFQ.