As a prominent supplier, Excellent Overseas is responsible for delivering unparalleled quality in ASTM A335 P91 Alloy Steel Seamless Pipe Suppliers from leading Manufacturers like Tubes, MSL, Seah, Hyundai, ArcelorMittal and NSSMC.
Table of Content
- 1. Supply Range & Dimensions
- 2. Manufacturers in Stock
- 3. P91 Chemical Composition
- 4. Mechanical Properties
- 5. Hardness Requirements
- 6. Equivalent Standards
- 7. Heat Treatment Requirements
- 8. A335 P91 Pipe Tolerances
- 9. Inspection Standards
- 10. P91 Type 1 vs Type 2
- 11. Delivery Conditions & More
- 12. Manufacturing Process
- 13. Countries We Export To
1. Supply Range & Dimensions
Seamless Pipe Size1/2" NB to 24" NB
Outside Diameter21.3 mm – 609.6 mm
Pipe Schedule (WT)SCH-10 to SCH-XXS Upto 80 MM
Pipe LengthSRL, DRL, 20 Ft, 40 Ft, Cut Length
Pipe TypesHot Finished Seamless, Cold Drawn Seamless
Pipe EndsPlain End (PE), Bevel End (BE)
Delivery ConditionsNormalized & Tempered (Mandatory)
Specification LevelASTM A335 / ASME SA335
Equivalent GradesEN 10216-2 X10CrMoVNb9-1, JIS G 3462 STBA26, ASTM A213 T91
Surface FinishNatural, Bare, Oiled, Mill Varnish
FormRound Pipe Only
End Protection CapsPlastic Caps or Iron Protectors
CertificationsComplete Traceability EN 10204 3.1, 3.2, IBR Certified
2. Manufacturers in Stock
Hyundai Hysco
Valcovny Trub
Benteler Make
SEAH Korea
Butting Make
JFE Make
ArcelorMittal
Tenaris Steel
MSL Make
Nippon Steel
Tubular Canada
Tubos API
3. Chemical Components
When you are looking for the chemical composition of P91, please be careful to distinguish between type, heat analysis, and product analysis.
| Grade / Analysis | Carbon | Manganese | Phosphorus | Sulfur | Silicon | Chromium | Molybdenum | Others |
|---|---|---|---|---|---|---|---|---|
| P91 Type 1 | 0.08 - 0.12 | 0.30 - 0.60 | 0.020, max | 0.010, max | 0.20 - 0.50 | 8.00 - 9.50 | 0.85 - 1.05 | V: 0.18-0.25 | N: 0.030-0.070 | Ni: 0.40 max | Al: 0.02 max | Nb: 0.06-0.10 | Ti: 0.01 max | Zr: 0.01 max |
| P91 Type 2 (Heat Analysis) |
0.08 - 0.12 | 0.30 - 0.50 | 0.020, max | 0.005, max | 0.20 - 0.40 | 8.00 - 9.50 | 0.85 - 1.05 | V: 0.18-0.25 | Ni: 0.20 max | Al: 0.020 max | N: 0.035-0.070 | N/Al ≥ 4.0 | Nb: 0.06-0.10 | Ti: 0.01 max | Zr: 0.01 max | Sn: 0.010 max | Sb: 0.003 max | As: 0.010 max | B: 0.001 max | W: 0.05 max | Cu: 0.10 max |
| P91 Type 2 (Product Analysis) |
0.07 - 0.13 | 0.30 - 0.50 | 0.020, max | 0.005, max | 0.20 - 0.40 | 8.00 - 9.50 | 0.80 - 1.05 | V: 0.16-0.27 | Ni: 0.20 max | Al: 0.020 max | N: 0.035-0.070 | N/Al ≥ 4.0 | Nb: 0.05-0.11 | Ti: 0.01 max | Zr: 0.01 max | Sn: 0.010 max | Sb: 0.003 max | As: 0.010 max | B: 0.001 max | W: 0.05 max | Cu: 0.10 max |
4. Mechanical Properties
| Grade | ASTM A335 P91 Type 1 and Type 2 |
|---|---|
| Tensile strength, min, ksi [MPa] | 85 [585] |
| Yield strength, min, ksi [MPa] | 60 [415] |
| Elongation in 2 in. or 50 mm, (or 4D), min, % | Longitudinal | Transverse |
|---|---|---|
| Basic minimum elongation for wall 5/16 in [8 mm] and over in thickness | 20 | — |
| Standard round 2 in or 50 mm specimen | 20 | 13 |
5. Hardness Requirement
| Grade | Brinell | Vickers | Rockwell |
|---|---|---|---|
| P91 Type 1 and Type 2 | 190 – 250 HBW | 196 – 265 HV | 91 HRBW – 25 HRC |
6. ASTM A335 P91 Equivalent
| ASME | ASTM | EN | JIS | GB |
|---|---|---|---|---|
| ASME SA335 P91 | ASTM A213 T91 | EN 10216-2 X10CrMoVNb9-1 | JIS G 3462 STBA26 | GB/T 5310 10Cr9Mo1VNbN |
7. Heat Treatment
| Grade | Heat Treat Type | Normalizing Temperature | Tempering Temperature, min |
|---|---|---|---|
| P91 Type 1, P91 Type 2 | normalize and temper | 1650 °F [900 °C] | 1100 °F [595 °C] |
| normalize and temper | 1900 - 1975 °F [1040 - 1080 °C] | 1350 - 1470 °F [730 - 800 °C] | |
| quench and temper | 1900 - 1975 °F [1040 - 1080 °C] | 1350 - 1470 °F [730 - 800 °C] |
8. A335 GR P91 ALLOY STEEL SEAMLESS PIPES TOLERANCE
| NPS | OD Tolerance | NPS | WT Tolerance |
|---|---|---|---|
| 1/8" ≤ NPS ≤ 1 1/2" | +/- 0.4 | 1/8" ≤ NPS ≤ 2 1/2", All T/D ratios. | +20%, -12.5% |
| 1 1/2" < NPS ≤ 4" | +/- 0.79 | NPS ≥ 2 1/2", T/D ≤ 5% | +22.5%, -12.5% |
| 4" < NPS ≤ 8" | +1.59, -0.79 | NPS ≥ 2 1/2", T/D > 5% | +15%, -12.5% |
| 8" < NPS ≤ 12" | +2.38, -0.79 |
(T = Specified Wall Thickness; D = Specified Outside Diameter)
9. Inspection Standards for ASTM A335 P91 Pipes
| Test | Standard |
|---|---|
| Visual Inspection | ASTM A530 |
| Dimensional Inspection | ASTM A999 |
| Chemical Composition Analysis | ASTM E415 |
| Tensile Test | ASTM A370 |
| Hardness Test | ASTM E10 |
| Ultrasonic Testing | ASTM E213 |
| MPI | ASTM E709 |
| Radiographic Testing | ASTM E94 |
| Hydrostatic Testing | ASTM A999 |
| Heat Treatment Verification | ASTM A335 |
10. ASTM A335 P91 Type 1 vs Type 2
| Parameter | P91 Type 1 | P91 Type 2 |
|---|---|---|
| UNS Designation | K91560 | K91560 |
| Sulfur (S) Max | 0.010% | 0.005% |
| Trace Element Limits | Standard specification | Strict limits for Sn, Sb, As, B, W, Cu |
| N/Al Ratio | Not specified | ≥ 4.0 |
11. Delivery Conditions & More
| Standard | Delivery Condition | Grade |
|---|---|---|
| ASTM A335 | Normalized & Tempered (N+T) | P91 |
| ASME SA335 | Normalized & Tempered (N+T) | P91 |
12. Process of Manufacturing
13. Countries We Export To
United States
Saudi Arabia
UAE
Brazil
Australia
Canada
Oman
Egypt
Singapore
Malaysia
Qatar
Kuwait
Germany
France
Italy
Spain
United Kingdom
Mexico
Indonesia
South Korea
Japan
Thailand
Vietnam
Turkey
China