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Seamless Alloy Pipe ASTM A335 P91 12IN Diameter XS
A335/SA335 P91 Is A Chrome Moly Alloy Seamless Pipes That Contains Excellent Strength And Temperature Resistance. It Is Designed For Enhanced Creep Strength, Making It A Creep Strength Enhanced Ferritic (CSEF). This Metal Is Made By Normalizing At 1050 °C, Air Cooling To 200 °C, And Then Tempered Through Heating To 760 °C. This Process Is The Main Reason Behind P91’S Creep Strength And Durability. P91 Stands For The Metal’s Composition Of 9% Chrome And 1% Molybdenum Plus Vanadium. The Chrome Increases Temperature Strength And Oxidation Resistance. The Molybdenum Increases The Elasticity, Resistance To Wear, And High Temperature Creep Strength.
A335/SA335 P91 pipe is suitable for bending, flanging (vanstoning), and similar forming operations and for fusion welding. P91 seamless alloy pipe is most commonly used in the power industry and petrochemical plants where fluids and gases are transported at extremely high temperatures and pressures.
P91’s strength and high temperature endurance makes it ideally suitable for plants that operate on a cyclic basis - like combined cycle plants. Also, the reduction in thickness suits HRSG designers, in an HRSG the temperature head is limited and locating the coils in the heat transfer path is very critical.
ASTM A335 P91 Chemical Composition
| C, % | Mn, % | P, % | S, % | Si, % | Cr, % | Mo, % | V, % | N, % | Ni, % | Al, % | Nb, % |
| 0.08-0.12 | 0.3-0.6 | 0.02 max | 0.01 max | 0.2-0.5 | 8.0-9.5 | 0.85-1.05 | 0.18-0.25 | 0.03-0.07 | 0.4 max | 0.04 max | 0.06-0.10 |
ASTM A335 P91 Properties
| Tensile Strength , MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
| 585 min | 415 min | 20 min | 250 max |
Material & Manufacture
Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.
Heat Treatment
A / N+T
N+T / Q+T
N+T
A / N+T
N+T / Q+T
N+T
Mechanical Tests Specified
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.
Steel grade: ASTM A335 P91
Outer Dimensions: 19.05mm – 1508mm
Wall Thickness: 2.0mm – 50 mm
Length: max 6-15m
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.
Steel grade: ASTM A335 P91
Outer Dimensions: 19.05mm – 1508mm
Wall Thickness: 2.0mm – 50 mm
Length: max 6-15m
My Company ASTM A335 P91 Alloy Seamless Pipe Specification
| Outer Dimensions | 19.05mm – 610mm |
| Wall Thickness | 2.0mm – 60 mm |
| Length | 6-12m |
| Schedule | Schedule 20 - Schedule XXS (heavier on request) up to 250 mm thk. |
| process | Cold drawn and hot rolling, heat treatment |
| Length | Single Random, Double Random & Cut Length. |
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