ASTM A335 P11 Seamless Alloy Steel Pipe | ASME SA-335 P11
We manufacture and supply ASTM A335 P11 / ASME SA-335 P11 seamless alloy steel pipes for refineries, petrochemical plants, power generation and high-temperature process piping systems.
Grade P11 / UNS K11597 is a chromium-molybdenum ferritic alloy steel commonly described as 1.25Cr-0.5Mo. The combination of chromium and molybdenum provides improved high-temperature strength and oxidation resistance compared with conventional carbon steel piping.
Standard and customized dimensions are available with heat treatment, NDE, PMI and EN 10204 3.1 material certification.
What Is ASTM A335 P11 Pipe?
ASTM A335/A335M covers nominal-wall and minimum-wall seamless ferritic alloy-steel pipe for high-temperature service.
P11 pipe is suitable for bending, flanging, similar forming operations and fusion welding when required by the piping design.
| Product | Typical Supply |
|---|---|
| Standard | ASTM A335/A335M / ASME SA-335 |
| Grade | P11 |
| UNS | K11597 |
| Alloy Type | 1.25Cr-0.5Mo |
| Manufacturing | Seamless, Hot-Finished / Cold-Finished |
| Typical OD | 21.3–610 mm |
| Typical Wall Thickness | 2.1–50.8 mm |
| Length | 6 m / Fixed / Customized |
| Ends | Plain End / Beveled End |
| Certification | EN 10204 3.1 MTC available |
Other dimensions and heavy-wall pipes can be evaluated according to project specifications.
Materials and Manufucture
Grade P11 Pipe may be either hot finished or cold drawn with the finishing treatment.
Heat Treatment:
P11 Seamless Ferritic Alloy-Steel Pipe are reheated and furnished in the full-annealed, isothermal annealed, or normal-ized and tempered condition. If furnished in the normalized and tempered condition,the minimum tempering temperature for Grades P11 are 1200°F [650°C].
Chemical Composition of ASTM A335 P11
| Grade | Chemical Composition(%) | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| P11 | 0.05-0.015 | 0.30-0.60 | ≤0.025 | ≤0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
Mechanical Properties of ASTM A335 P11
| Grade | Mechanical property | ||
| Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | |
| P11 | ≥415 | ≥205 | ≥30 |
Hydrostatic Test
Each length of pipe shall be subjected to the hydrostatic test or nondestructive examination.
Mechanical Tests Required
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 1 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.
Marking
In addition to the marking prescribed in Specification A 999/A 999M, the marking shall include the length, the ANSI schedule number and the heat number or manufacturer’s number by which the heat can be identified.
Difference Between ASTM A335 P11 and ASTM A213 T11 Tubes
| Feature | ASTM A335 P11 | ASTM A213 T11 |
|---|---|---|
| Standard Title | ASTM A335 – Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service | ASTM A213 – Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes |
| Product Form | Pipe (for piping systems) | Tube (for heat exchangers, boilers, superheaters) |
| Typical Application | Main steam lines, headers, high-temperature piping in refineries, power plants | Boiler tubes, superheater tubes, heat exchanger tubes |
| Manufacturing Method | Seamless, hot-finished or cold-drawn | Seamless, usually cold-drawn for precise tolerance |
| Dimension Standard | As per ASME B36.10M (Pipe dimensions) | As per ASME B36.19M / Boiler Tube standards |
| Size Range (Common) | NPS 1/8″ to 24″ (large OD pipes) | OD 6–125 mm, WT 0.8–12 mm (small OD tubes) |
| Material Grade | P11 | T11 |
| UNS Designation | K11597 | K11597 |
| Chemical Composition (Typical, %) | Cr 1.00–1.50, Mo 0.44–0.65, C ≤ 0.15, Mn 0.30–0.60, Si 0.50–1.00 | Same as P11 |
| Mechanical Properties (Min.) | Tensile: 415 MPa; Yield: 205 MPa; Elongation: 30 % | Same as P11 |
| Heat Treatment | Normalize and temper, or full anneal | Normalize and temper, or full anneal |
| End Finish | Beveled or plain ends (for welding) | Plain ends (for expansion into tube sheets) |
| Testing Requirements | Hydrostatic / NDE / flattening test | Hydrostatic / NDE / flaring and flattening tests |
| Standards Used With | ASME B31.1 /ASME B31.3 process piping codes | ASME Boiler & Pressure Vessel Code (Section I / VIII) |
Related Cr-Mo Alloy Steel Products
- ASTM A335 P5 Seamless Pipe – 5Cr-0.5Mo alloy steel pipe for high-temperature service.
- ASTM A335 P9 Seamless Pipe – 9Cr-1Mo high-temperature alloy steel pipe.
- ASTM A335 P22 Seamless Pipe – 2.25Cr-1Mo alloy steel pipe for elevated-temperature piping.
- ASTM A335 P91 Seamless Pipe – Modified 9Cr-1Mo-V-Nb alloy steel for advanced high-temperature applications.
- ASTM A213 T11 Alloy Steel Tube – 1.25Cr-0.5Mo boiler, superheater and heat-exchanger tube.
- ASTM A213 T22 Alloy Steel Tube – 2.25Cr-1Mo seamless heat-transfer tube.
- ASTM A234 WP11 Pipe Fittings – Cr-Mo elbows, tees and reducers.
- ASTM A182 F11 Flanges – Forged Cr-Mo alloy steel flanges for high-temperature piping.
ASTM A335 P11 Seamless Pipe Supplier
We supply ASTM A335 / ASME SA-335 Grade P11 seamless alloy steel pipes for international refinery, petrochemical, power and high-temperature process piping projects.
Customized dimensions, fixed lengths, heat treatment, NDE, PMI and complete inspection documentation can be supplied according to project specifications.
For quotation, please provide the NPS or OD, schedule or wall thickness, length, quantity, heat-treatment requirements and required inspection documents.
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Pls just drop us a mail, you will be satisfied with our good quality,reasonable price and professioanl service.
MTC EN 10204 3.1 ,inspection and PMI pictures can be provided before shipment.
