Seamless Alloy Steel Boiler Pipe ASTM A335 P91 for High Temperature
Service
P91 pipe is a kind of chrome moly pipes lsted in ASTM A335, a
standard in the power generation industry and the petrochemical
industry. We have the most advanced manufacturing technology. Our
piercing and rolling technology possesses a number of patents in
designing and manufacturing the equipment, and has improved in lots
of areas targeting better performance and efficiency.
1. Standards:
ASTM A335 Standard Specification for Seamless Ferritic Alloy-Steel
Pipe for High-Temperature Service
2. Application:
For high pressure boiler and steam header pipes; petrochemical
industry pipes; thermal power plant; nuclear power plant; USC
boiler.
3. 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)
4. 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 |
5. 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. |
6. Tensile Requirements
Tensile Strength min.: 85ksi / 585MPa
Yield Strength min.: 64ks / 415MPa
7. Inspection & Test
Chemical composition, mechanical properties ( tensile strength,
yield strength, elongation, flaring, flattening, bending, hardness,
impact test), surface and dimension, NDE, hydrostatic test.
8. Manufacture
Hot Rolled or Cold Drawn
9. Manufacturing Process
Raw Material Inspection → Cold Centering → Heating → Piercing &
Rolling → SIzing → Heat Treatment → Testing → Finishing → NDE →
Visual & Dimension Inspection → Marking → Storing & Shipping
10. 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
