ASME SA335 ASTM A 335 P11 Seamless Pipes Alloy Steel Pipe
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ASTM A335 Gr. P11 seamless pipes, with nominal chemical composition of “1.25Cr-0.5Mo” or “1.25Cr-0.5Mo-Si”, can be used for ASME B31.3 process piping. The ASME B31.3 Code has designated ASTM A335 Gr. P11 as a listed material and provided the basic allowable stresses in tension at various temperatures.
ASTM A335 P11 Seamless Ferritic Alloy-Steel Pipes
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 2.1mm——50.8 mm.
Outer diameter (OD): 21.3 mm——610mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
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) |
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MTC EN 10204 3.1 ,inspection and PMI pictures can be provided before shipment.
