Yuhong Group Co.,Ltd
| Service Temperature | Suitable for Elevated Temperature Service |
| Steel Classification | 9Cr-1Mo Ferritic Alloy Steel |
| Surface Finish | Black Painted, Varnished or Bare |
| Industry Applications | Power Generation, Petrochemical, Oil & Gas |
| Available Size Range | 1/8"–24" (Customized Available) |
| Payment Terms | T/T, L/C AT SIGHT |
| Supply Ability | 5000 tons per month |
| Delivery Time | Depends on quantity |
| Manufacturing Process | Hot Finished or Cold Drawn Seamless |
| Delivery Condition | Normalized and Tempered |
| Material Grade | ASTM A335 P9 / ASME SA335 P9 |
| Packaging Details | Bundled with steel straps, fitted with plastic caps and packed in seaworthy export packaging. |
| Brand Name | YUHONG |
| Model Number | ASTM A335 P9 Alloy Steel Seamless Pipe |
| Certification | ABS, BV, DNV, GL, LR, SGS, IEI |
| Place of Origin | China |
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Product Specification
| Service Temperature | Suitable for Elevated Temperature Service | Steel Classification | 9Cr-1Mo Ferritic Alloy Steel |
| Surface Finish | Black Painted, Varnished or Bare | Industry Applications | Power Generation, Petrochemical, Oil & Gas |
| Available Size Range | 1/8"–24" (Customized Available) | Payment Terms | T/T, L/C AT SIGHT |
| Supply Ability | 5000 tons per month | Delivery Time | Depends on quantity |
| Manufacturing Process | Hot Finished or Cold Drawn Seamless | Delivery Condition | Normalized and Tempered |
| Material Grade | ASTM A335 P9 / ASME SA335 P9 | Packaging Details | Bundled with steel straps, fitted with plastic caps and packed in seaworthy export packaging. |
| Brand Name | YUHONG | Model Number | ASTM A335 P9 Alloy Steel Seamless Pipe |
| Certification | ABS, BV, DNV, GL, LR, SGS, IEI | Place of Origin | China |
| High Light | ASTM A335 Alloy Steel Seamless Pipe ，SA335 P9 Alloy Steel Seamless Pipe ，ASTM A335 P9 Seamless Pipe | ||
ASTM A335 P9 Alloy Steel Seamless Pipe
Product Introduction
Seamless 9Cr-1Mo Alloy Steel Pipe for Elevated Temperature and Pressure Systems
ASTM A335 P9 Alloy Steel Seamless Pipe is manufactured for high-temperature and high-pressure service where long-term mechanical stability is required. Produced in accordance with ASTM A335 / ASME SA335, P9 is a ferritic chromium-molybdenum alloy steel containing approximately 9% chromium and 1% molybdenum. This alloy composition improves oxidation resistance, creep strength and structural stability under elevated operating temperatures.
The seamless construction provides uniform mechanical properties around the pipe circumference and is suitable for fabrication processes including bending, flanging and fusion welding. ASTM A335 P9 pipes are widely used in power generation, refinery process units, petrochemical plants, superheaters, reheaters and main steam piping systems.
Product Features
The 9Cr-1Mo alloy system provides stable mechanical properties for continuous service at elevated temperatures.
Chromium-rich alloy composition improves scaling resistance in high-temperature steam and process environments.
Suitable for long-term operation under elevated temperature and pressure where creep performance is an important design consideration.
Manufactured without longitudinal welds to provide uniform strength and reliable performance in pressure piping systems.
Suitable for bending, flanging and fusion welding in accordance with ASTM A335 requirements.
Equivalent Material Grades
|
Standard |
Grade |
|---|---|
|
ASTM / ASME |
ASTM A335 P9 / ASME SA335 P9 |
|
ASTM Flanges / Forging |
ASTM A182 F9 |
|
ASTM Fittings |
ASTM A234 WP9 |
|
UNS |
K90941* |
|
EN |
1.7386 (Approximate Equivalent) |
|
DIN |
X12CrMo9-1 (Approximate Equivalent) |
|
JIS |
STPA26 (Similar Grade) |
|
GB/T |
No Fully Equivalent Grade |
Chemical composition(%) of A335 Alloy Steel Seamless Pipe
| Grade | C | Mn | P≤ | S≤ | Si | Cr | Mo |
| P11 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
| P22 | 0.05-0.16 | 0.30-0.60 | 0.025 | 0.025 | ≤0.50 | 1.90-2.60 | 0.87-1.13 |
| P5 | ≤0.15 | 0.30-0.60 | 0.025 | 0.025 | ≤0.50 | 4.00-6.00 | 0.45-0.65 |
| P9 | ≤0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.25-1.00 | 8.00-10.00 | 0.90-1.10 |
| P91 | 0.08-0.12 | 0.30-0.60 | 0.020/0.010 | 0.020/0.010 | 0.02-0.50 | 8.00-9.50 | 0.85-1.05 |
| P92 | 0.07-0.13 | 0.30-0.60 | 0.020/0.010 | 0.020/0.010 | ≤0.50 | 8.50-9.50 | 0.30-0.60 |
Mechanical properties of A335 Alloy Steel Seamless Pipe
| Grade | Tensile strength | Yield strength | Elongation |
| P11, P22, P5, P9 | ≥415 | ≥205 | ≥30/20 |
| P91 | ≥585 | ≥415 | ≥20 |
| P92 | ≥620 | ≥440 | ≥20 |
Typical Applications
Power Plant Main Steam Lines
Superheater Systems
Reheater Systems
High Temperature Process Piping
Petrochemical Plants
Oil Refineries
Chemical Processing Facilities
Industrial Boilers
Heat Recovery Systems
High Pressure Steam Pipelines
Frequently Asked Questions
1. What is ASTM A335 P9 seamless pipe used for?
ASTM A335 P9 seamless pipe is primarily used in high-temperature and high-pressure piping systems for power plants, refineries and petrochemical facilities.
2. What is the difference between ASTM A335 P9 and P91?
P91 contains additional alloying elements such as vanadium and niobium, providing higher creep strength than P9 for more demanding elevated-temperature applications.
3. What heat treatment is applied to ASTM A335 P9 pipe?
ASTM A335 P9 seamless pipes are typically supplied in the normalized and tempered condition to achieve the required mechanical properties.
4. Can ASTM A335 P9 pipe be welded?
Yes. It is suitable for welding using qualified procedures, with preheating and post-weld heat treatment applied as required by the project specification.
5. What inspection documents are available?
EN 10204 3.1 MTC, chemical analysis, mechanical test reports, hydrostatic testing and third-party inspection can be provided upon request.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou... Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
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