ASTM A335 P91 Seamless Steel Pipe A335 P91 Alloy Steel Pipe
ASTM A335 P91 Seamless Pipes are ferritic alloy steel pipes designed for high-temperature service applications, such as steam pipelines, boilers, and power generation systems. These pipes are known for their exceptional creep strength, oxidation resistance, and long-term durability under elevated temperatures and pressures.
Download ASTM A335 2024 pdf
A335/SA335 P91 is a ferritic alloy steel that has very high strength properties and creep resistant. It is also called 9 Cr 1 Mo steel, or chrome moly pipe, based on its composition.P refers to Pipes, 9 refers to 9% Cr content and 1 refers to 1% Mo content.
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ASTM A335 P91 Pipes 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.
ASTM A335 P91 Pipes Specification
| Outer Dimensions | 19.05mm – 904mm |
| Wall Thickness | 2.0mm – 60 mm |
| Length | max 16000mm |
| Schedule | Schedule 20 – Schedule XXS (heavier on request) up to 250 mm thk. |
| Form | Round, Square, Rectangular, Hydraulic Etc. |
| Standard | ASTM A335 P91, SA335 P91 (with IBR Test Certificate) |
| Size | 1/2 NB to 36 NB |
| Thickness | 3-60mm |
| Schedule | SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules |
ASTM A335 P91 Pipes Chemical Composition
| Alloy Steel P91 | C | Cr | Mn | Mo | P | S | Si |
| 0.08-0.12 | 8.00 – 9.50 | 0.30-0.60 | 0.85 – 1.05 | 0.020 max | 0.010 max | 0.20 -0.50 |
ASTM A335 P91 Pipe Equivalent
| ASME | ASTM | JIS G 3458 | LRS | A335 Gr P91 Equivalent Material | BS | UNS | DIN | ABS | ISO | NK |
|---|---|---|---|---|---|---|---|---|---|---|
| SA335 P91 | A335 P91 | T91, K90901, X10CrMoVNb9-1, 1.4903 | K91560 |
ASTM A335 P91 Pipe Mechanical Properties
| Hardness, HB | Yield Strength, MPa | Tensile Strength , MPa | Elongation, % |
| 250 max | 415 min | 585 min | 20 min |
ASTM A335 Grade p91 Pipe Heat Treatment
- A / N+T
- N+T / Q+T
- N+T
ASTM A335 Grade p91 Pipe Hardness Requirements
| Grade | P91 Type 1 and Type 2 |
|---|---|
| Brinell | 190 – 250 HBW |
| Vickers | 196 – 265 HV |
| Rockwell | 91HRBW – 25 HRC |
ASTM A335 P91 Alloy Steel Pipe Test
- 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.
ASTM A335 P91 Alloy Steel Pipe Application
A335/SA335 P91 is suitable for bending, flanging (vanstoning), and similar forming operations and for fusion welding. P91 is most commonly used in the power industry and petrochemical plants where fluids and gases are transported at extremely high temperatures and pressures.
ASTM A335 P91 High Pressure Semaless Boiler Pipe Alloy Seamless Steel Pipe
Steel grade: ASTM A335 P91
ASTM A335 P91 alloy steel pipe
Each length of pipe shall be subjected to the hydrostatic test. Also, each pipe shall be examined by a non-destructive examination method in accordance to the required practices.
The different mechanical test requirements for pipes, namely, transverse or longitudinal tension test, flattening test, and hardness or bend test are presented.Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.
How to order our ASTM A335 P91 Alloy steel Pipes？
Product Item: Seamless Steel Pipe
Material: ASTM A335 P91
Size: 24 Inch
Thickness: SCH 140
ASTM-A335-P91-Seamless-Steel-Pipe
Download ASTM A335 P91 Alloy steel Pipe specification
Related Fittings & Flanges (for P91 Material)
-
ASTM A234 WP91 Butt Weld Pipe Fittings
– A234 WP91 Elbows, A234 WP91 Tees, Reducers, Caps, and Stub Ends. -
ASTM A182 F91 Alloy Steel Flanges
– ASTM A182 F91 Weld Neck Flange, Blind, Slip-On, Socket Weld, Threaded, and Lap Joint Flanges. -
ASTM A213 T91 Seamless Tubes
– Ideal for superheater and reheater tubes in boilers.
