ASTM A335 ASME SA335 P91 Seamless Ferritic Alloy-Steel Pipe
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ASTM A335 P91 Seamless Ferritic Alloy-Steel Pipe
Standard: ASTM A 335/A 335M
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P91 Seamless Ferritic Alloy-Steel Pipes cover nominal (average) wall seamless alloy-steel pipe intended for high-temperature service.
ASTM A335 P91 Seamless Ferritic Alloy-Steel Pipe Quick Details
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 2.1mm——20 mm.
Outer diameter (OD): 21 mm——509mm
Common specifications:25mm*7mm, 141.3mm*6.55mm, 323.9mm*25.4mm,
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
Additional Info
Port of Shipment: Tianjin, China
Payment Terms:T / T, LC
Delivery: 7-15 days after payment
Surface: Tubes will be varnished (Outside only) to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden) or as required
Materials and Manufacture
Grade P91 Pipe may be either hot finished or cold drawn with the finishing treatment.
Heat Treatment:
Grade P91 Seamless Ferritic Alloy-Steel Pipes will be normalized at 1900°F [1040°C] minimum, and tempered at 1350°F [730°C] minimum as a final heat treatment.
Alternatively, liquid quenching and tempering is allowed for thicknesses above 3 in. when we mutually agreed with the purchaser.
Chemical Composition of ASTM A335 P91
Grade | C | Mn | P | S | Si | Cr |
A335 P91 | 0.08-0.12 | 0.3-0.6 | ≤0.02 | ≤0.01 | 0.2-0.5 | 8.0-9.5 |
Mo | V | N | Ni | Al | Nb | |
0.85-1.05 | 0.18-0.25 | 0.03-0.07 | ≤0.4 | ≤0.04 | 0.06-0.10 |
Mechanical Properties of ASTM A335 P91
Grade | Mechanical property | ||
Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | |
P91 | ≥510 | ≥400 | ≥20 |
NPS Designator | Over | Under | ||
in. | mm | in. | mm | |
1⁄8 to 1 1⁄2 , incl. | 1 ⁄ 64 (0.015) | 0.40 | 1 ⁄ 64 (0.015) | 0.40 |
Over 1 1⁄2 to 4, incl. | 1 ⁄ 32 (0.031) | 0.79 | 1 ⁄ 32 (0.031) | 0.79 |
Over 4 to 8, incl. | 1 ⁄ 16 (0.062) | 1.59 | 1 ⁄ 32 (0.031) | 0.79 |
Over 8 to 12, incl. | 3 ⁄ 32 (0.093) | 2.38 | 1 ⁄ 32 (0.031) | 0.79 |
Over 12 | ± 1 % |
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.
Photos of ASTM A335 P91 Seamless Ferritic Alloy-Steel Pipe
![ASTM_A335_P91_Seamless_Ferritic_Alloy_Steel_Pipe ASTM_A335_P91_Seamless_Ferritic_Alloy_Steel_Pipe](/uploads/allimg/191014/1-1910141IFc01.png)
![ASme_SA335_P91_Seamless_Ferritic_Alloy_Steel_Pipe ASme_SA335_P91_Seamless_Ferritic_Alloy_Steel_Pipe](/uploads/allimg/191014/1-1910141IHS25.jpg)
Note: Material furnished under ASTM A335 conform to the applicable requirements of the current edition of Specification A 999/A 999M
Comprehensive performance table of power station project::
Project | Type | Material | Specifications |
Datang International Shendong power plant | Seamless steel tube | A335 P91 | 25mm*7mm |
CLP (Sihui) thermal power plant | Seamless steel tube | A335 P91 | 88.9mm*10.30mm |