ASTM A335 P9 Seamless Pipe Manufacturer & Supplier in China
High Temperature Chrome Moly Alloy Steel Pipe Exporter
ASTM A335 P9 Seamless Pipe is a high-temperature and high-pressure chromium molybdenum alloy steel pipe widely used in power plants, oil & gas industries, refineries, petrochemical plants, and boiler piping systems.
As a professional ASTM A335 P9 pipe manufacturer and exporter in China, we supply high-quality seamless chrome moly pipes with competitive factory prices, fast delivery, and international inspection standards for global industrial projects.
Our alloy steel P9 pipes are known for:
- Excellent creep resistance
- Outstanding oxidation resistance
- Superior high-temperature strength
- Good corrosion resistance
- Long service life under extreme conditions
ASTM A335 P9 Pipe
9%Cr+1%Mo
ASTM A335 Grade P9 is a ferritic alloy steel seamless pipe containing approximately 9% chromium and 1% molybdenum. It is specifically designed for high-temperature service applications ranging from 550°C to 650°C.
Due to its excellent heat resistance and mechanical strength, ASTM A335 P9 chrome moly pipe is widely used in:
- High-pressure steam pipelines
- Boiler systems
- Heat exchangers
- Refinery piping
- Thermal power station piping
- Petrochemical processing plants
What is ASTM A335 P9 Pipe?
ASME SA335 P9 Pipe is a seamless ferritic alloy steel pipe manufactured according to ASTM A335 / ASME SA335 standards for elevated temperature service.
P9 alloy steel pipe offers:
- Excellent heat resistance
- Strong creep rupture strength
- Low thermal expansion
- High pressure resistance
- Good weldability
- Excellent durability in harsh industrial environments
These properties make ASTM A335 P9 seamless pipe ideal for high-temperature and high-pressure piping systems.
ASTM A335 P9 Pipe Specifications
Download astm-a335-p9-pipe-specification
| Specification | Details |
|---|---|
| Standard | ASTM A335 / ASME SA335 |
| Grade | P9 |
| Pipe Type | Seamless Alloy Steel Pipe |
| Material | Chrome Moly Alloy Steel |
| Manufacturing Process | Hot Finished / Cold Drawn |
| Size Range | 1/2” NB – 36” NB |
| Wall Thickness | 3mm – 12mm |
| Schedule | SCH 5 – SCH XXS |
| Length | 6m, 12m, Random Length |
| Ends | Plain End, Beveled End, Threaded |
| Pipe Form | Round Pipe / Alloy Steel Tube |
Chemical Composition of ASTM A335 P9 Pipe
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| P9 | ≤0.15 | 0.30–0.60 | ≤0.025 | ≤0.025 | 0.25–1.00 | 8.00–10.00 | 0.90–1.10 |
The chromium molybdenum alloy composition significantly improves oxidation resistance, creep strength, and thermal stability under elevated temperatures.
Mechanical Properties of ASTM A335 P9 Pipe
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| P9 | ≥380 | ≥205 | ≥30 |
P9 Chrome Moly Pipe provides reliable mechanical performance in high-pressure and high-temperature industrial applications.
Applications of ASTM A335 P9 Seamless Pipe
ASTM A335 P9 alloy steel pipes are extensively used in:
- Oil and Gas Industry
- Power Generation Plants
- Petrochemical Industry
- Refineries
- Fertilizer Plants
- Gas Processing Plants
- Heat Exchangers
- Boilers and Superheaters
- High Pressure Steam Pipelines
- Offshore Industrial Projects
Because of its high creep resistance and thermal fatigue resistance, P9 seamless pipe is widely used in critical industrial piping systems.
ASTM A335 P9 vs P91 Pipe
| Grade | Chromium Content | Temperature Resistance | Main Applications |
|---|---|---|---|
| P9 | 9% Cr | High | Boilers, Refineries, Steam Piping |
| P91 | 9% Cr + V + Nb | Very High | Supercritical Power Plants |
Compared with P91 pipe, ASTM A335 P9 pipe offers good high-temperature performance with lower alloy cost, making it suitable for many industrial high-pressure piping systems.
Equivalent Grades of ASTM A335 P9 Pipe
| Standard | Equivalent Grade |
|---|---|
| EN | 1.7386 |
| DIN | X11CrMo9-1 |
| DIN | X12CrMo9-1 |
| ASTM | A213 P9 |
| BS | 3604/629 |
Manufacturing Process & Heat Treatment
Our ASTM A335 P9 seamless pipes are available in:
- Hot Finished
- Cold Drawn
- Normalized and Tempered (N+T)
- Quenched and Tempered (Q+T)
Advanced heat treatment processes improve the pipe’s creep resistance, strength, and high-temperature performance.
Inspection & Testing
All ASTM A335 Alloy Steel Pipe products are tested according to international quality standards.
Inspection includes:
- Chemical composition analysis
- Mechanical testing
- Tensile testing
- Yield strength testing
- Hardness testing
- Flattening and bending tests
- Hydrostatic testing
- Ultrasonic testing (UT)
- Non-destructive testing (NDT)
- PMI testing
- Third-party inspection (SGS / BV / TUV)
Mill Test Certificates (EN 10204 3.1 / 3.2) are available upon request.
Packaging & Delivery
Standard export seaworthy packaging:
- Wooden cases
- Bundles packing
- Plastic end caps
- Waterproof wrapping
Delivery time:
- 7–25 days depending on order quantity
How to Order ASTM A335 P9 Seamless Pipe
Example order format:
ASTM A335 P9 Seamless Pipe
Size: 6" NB
Schedule: SCH 80
Length: 6 Meters
Quantity: XX Tons
FAQ About ASTM A335 P9 Pipe
What is ASTM A335 P9 pipe used for?
ASTM A335 P9 pipe is mainly used in high-temperature and high-pressure applications such as power plants, refineries, petrochemical plants, boilers, and steam pipelines.
What is the temperature range of P9 pipe?
P9 chrome moly alloy steel pipe is generally used in temperatures ranging from 550°C to 650°C.
Is ASTM A335 P9 pipe seamless?
Yes. ASTM A335 P9 is primarily manufactured as seamless alloy steel pipe for critical high-pressure service applications.
What is the difference between P9 and P22 pipe?
P9 pipe contains approximately 9% chromium, while P22 contains around 2.25% chromium. P9 offers higher heat resistance and better oxidation resistance than P22.
What are the equivalent materials for ASTM A335 P9?
Equivalent grades include EN 1.7386, X11CrMo9-1, X12CrMo9-1, and ASTM A213 P9.
Leading ASTM A335 P9 seamless pipe manufacturer and exporter in China. Supplying high-quality chrome moly alloy steel pipes for high-temperature and high-pressure applications worldwide.
We also supply a wide range of alloy steel pipes and fittings for high-temperature and high-pressure applications:
- ASTM A335 P5 Seamless Pipe
- ASTM A335 P11 Seamless Pipe
- ASTM A335 P22 Seamless Pipe
- ASTM A335 P91 Seamless Pipe
- ASTM A234 WP9 elbow
- ASTM A182 F9 Weld neck flanges
ASTM A335 P9 Alloy Seamless Steel Pipe
