Thermal Power Plant P91 Seamless Pipe for High Temperature Service
The pipe of P91 is mainly used in thermal power and petrochemical & refinery field. Mechanical properties and dimensions are uniform in longitudinal & transversal directions. Pipe has better surface and without any defects.
1. Reference Documents
- ASTM A999/A 999M Specification for General requirements for Alloy and Stainless Steel Pipe.
- ASTM E 213 Practice for Ultrasonic Examination of metal Pipe and Tubing
- ASTM E 309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
- ASTM E 381 Method of Macroetch testing Steel Bars, Billets, Blooms, and Forgings
- ASTM E 570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
- ASME B26.10M Welded and Seamless Wrought Steel Pipe
2. Standards:
ASTM A335 Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
3. Application:
For high pressure boiler and steam header pipes; petrochemical industry pipes; thermal power plant; nuclear power plant; USC boiler.
4. Ordering Information
Quantity (feet, meters, or number of lengths),
Name of material (seamless alloy steel pipe),
Grade (P91),
Manufacture (hot-finished or cold-drawn),
Size using one of the following:
NPS and schedule number;
Outside diameter and nominal wall thickness;
Outsider diameter and minimum wall thickness;
Inside diameter and nominal wall thickness;
Inside Diameter and minimum wall thickness.
Length (specific or random)
End finish (plain end or bevel end)
5. Chemical Requirements
| Chemical Requirements |
| Grade | UNS Designation | Composition, % |
| C | Mn | P
max | S
max | Si | Cr | Mo | Others |
| P91 | K91560 | 0.08-0.12 | 0.30-0.60 | 0.020 | 0.010 | 0.20-0.50 | 8.00-9.50 | 0.85-1.05 | V 0.18-0.25 |
| N 0.030-0.070 |
| Ni 0.40max |
| Al 0.02max |
| Cb 0.06-0.10 |
| Ti 0.01 max |
| Zr 0.01max |
6. Available Size Range
| OD | Thickness |
| mm | inch | mm | SCH |
| 88.9~1422 | 3''~ 56'' | 2.11~140 | ≥SCH10 |
| *If the steel grades and size you are looking for are not listed above, please contact us for further information. |
7. Tensile Requirements
Tensile Strength min.: 85ksi / 585MPa
Yield Strength min.: 64ks / 415MPa
8. Inspection & Test
Chemical composition, mechanical properties ( tensile strength, yield strength, elongation, flaring, flattening, bending, hardness, impact test), surface and dimension, NDE, hydrostatic test.
9. Manufacture
Hot Rolled for 8'' and above or Cold Drawn for 6'' and below
10. Manufacturing Process
Raw Material Inspection → Cold Centering → Heating → Piercing & Rolling → SIzing → Heat Treatment → Testing → Finishing → NDE → Visual & Dimension Inspection → Marking → Storing & Shipping
11. Supplementary Requirements
S1. Product Analysis
S2. Transverse Tension Tests
S3. Flattening Test
S4. Metal Structure and Etching Tests
S5. Photomicrographs
S6. Photomicrographs for Individual Pieces
We can also accept additional requirements beyond of standard, including:
The ratio of Nitrogen to Aluminum shall be a minimum of 4.
Minimum hardness based on material certificates shall be 210HV 9200HB) (93.4HRB).
Impact value must be 27J at 20°C.
Product Tags:
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P91 Seamless Steel Pipe Hot Rolled ASTM A335 Standard High Temperature Service Images
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