As a prominent supplier, Excellent Overseas is responsible for delivering unparalleled quality in ASTM A335 P9 Alloy Steel Seamless Pipe Suppliers from leading Manufacturers like Tubes, MSL, Seah, Hyundai, ArcelorMittal and NSSMC.
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 ConditionsAnnealed / Normalized & Tempered
Specification LevelASTM A335 / ASME SA335
Equivalent GradesEN 10216-2 X11CrMo9-1+I, ASTM A213 T9, JIS G 3461 STBA26
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
P9 has a high percentage of 8 – 10 % chromium, which is unique among the lower grades of ASTM A335. This significantly increases the hardness and corrosion resistance of P9, allowing it to excel in high-temperature and corrosive environments.
| Grade |
Carbon |
Manganese |
Phosphorus |
Sulfur |
Silicon |
Chromium |
Molybdenum |
| ASTM A335 P9 |
0.15 max |
0.30 - 0.60 |
0.025 max |
0.025 max |
0.25 - 1.00 |
8.00 - 10.00 |
0.90 - 1.10 |
4. Mechanical Properties
ASTM A335 P9 and P5, P5b, P5c, P11, P15, P21, and P22 have the same tensile and yield strengths.
| Grade |
ASTM A335 P9 |
| Tensile strength, min, ksi [MPa] |
60 [415] |
| Yield strength, min, ksi [MPa] |
30 [205] |
| 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, strip tests, and for all small sizes tested in full section |
30 |
20 |
| When standard round 2 in or 50 mm gage length or proportionally smaller size specimen with the gage length equal to 4D (4 times the diameter) is used |
22 |
14 |
5. Hardness Requirement
| Grade |
Brinell |
Vickers |
Rockwell |
| P9 |
≤ 241 HBW |
≤ 241 HV |
≤ 100 HRB |
6. ASTM A335 P9 Equivalent
| ASME |
ASTM |
EN |
JIS |
| ASME SA335 P9 |
ASTM A213 T9 |
EN 10216-2 X11CrMo9-1+I |
JIS G 3461 STBA26 |
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7. Heat Treatment
ASTM A335 P9 All tubes shall be manufactured by the seamless process and heat treated in accordance with the appropriate requirements.
| Grade |
Heat Treat Type |
Normalizing Temperature |
Tempering Temperature, min |
| P9 |
full or isothermal anneal |
— |
— |
| normalize and temper |
— |
1250 °F [675 °C] |
8. A335 GR P9 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 P9 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. Process of Manufacturing
11. 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
