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Xi'an Dongmeng Group Co., Ltd. supplies ASTM A335 P11 / ASME SA335 P11 seamless chrome moly alloy steel pipe for high-temperature and high-pressure service in power plants, refineries, petrochemical units, boilers, heat exchangers and industrial pressure piping systems.
ASTM A335 P11 is a 1.25Cr-0.5Mo ferritic alloy steel pipe grade designed for elevated-temperature service. Compared with ordinary carbon steel pipe, P11 provides better high-temperature strength, oxidation resistance, creep resistance and long-term performance in steam and process piping applications.
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Why Choose ASTM A335 P11 Pipe?
ASTM A335 P11 pipe is widely selected when the piping system needs to work under elevated temperature and pressure. The chromium and molybdenum content improves oxidation resistance, high-temperature strength and creep resistance, making P11 suitable for boiler, refinery and petrochemical service.
For B2B buyers, choosing the right P11 pipe is not only about price. Chemical composition, heat treatment, dimensional tolerance, NDT inspection, MTC traceability and export packing all directly affect project safety, welding quality and long-term service performance.
Key Advantages
Designed for high-temperature service
Seamless construction for pressure-bearing applications
Better oxidation resistance than standard carbon steel pipe
Good creep resistance under long-term elevated temperature
Suitable for bending, flanging and fusion welding
Compatible with ASTM A234 WP11 fittings and ASTM A182 F11 flanges
Available with full heat number traceability and MTC documentation
ASTM A335 P11 Pipe Specification
| Item | Specification |
| Product | ASTM A335 P11 Seamless Pipe |
| Equivalent Standard | ASME SA335 P11 |
| Material Type | Ferritic Chrome Moly Alloy Steel |
| UNS Number | K11597 |
| Manufacturing Process | Hot Rolled / Cold Drawn Seamless |
| Outside Diameter | NPS 1/2"–24" or customized |
| Wall Thickness | SCH 40, SCH 80, SCH 160, XS, XXS, custom wall thickness |
| Length | 6m, 12m, SRL, DRL, cut-to-length |
| Pipe Ends | PE, BE, threaded end on request |
| Surface | Black, varnished, oiled, anti-rust coating |
| Inspection | Chemical analysis, tensile test, hardness test, hydrostatic test, UT |
| Certificate | MTC EN 10204 3.1 / 3.2 available |
| Packing | Bundles, end caps, waterproof wrapping, steel strips, export seaworthy packing |
ASTM A335 P11 Chemical Composition
| Element | Requirement % |
| Carbon, C | 0.05–0.15 |
| Manganese, Mn | 0.30–0.60 |
| Phosphorus, P | ≤0.025 |
| Sulfur, S | ≤0.025 |
| Silicon, Si | 0.50–1.00 |
| Chromium, Cr | 1.00–1.50 |
| Molybdenum, Mo | 0.44–0.65 |
The controlled chromium and molybdenum content gives ASTM A335 P11 pipe improved high-temperature strength and oxidation resistance. This makes it suitable for steam lines, boiler tubes, process piping and pressure piping systems where carbon steel may not provide sufficient performance.
ASTM A335 P11 Mechanical Properties
| Property | Requirement |
| Tensile Strength | ≥415 MPa |
| Yield Strength | ≥205 MPa |
| Elongation | ≥30% |
| Hardness | According to ASTM A335 / project requirement |
Mechanical properties are verified by mill testing and recorded in the MTC. For critical projects, additional impact test, hardness test, UT, hydrostatic test or third-party inspection can be arranged according to the purchase order requirement.
Available Size Range
| NPS | OD mm | Common Schedules |
| 1/2" | 21.3 | SCH 40 / SCH 80 / SCH 160 |
| 3/4" | 26.7 | SCH 40 / SCH 80 / SCH 160 |
| 1" | 33.4 | SCH 40 / SCH 80 / SCH 160 |
| 1-1/2" | 48.3 | SCH 40 / SCH 80 / SCH 160 |
| 2" | 60.3 | SCH 40 / SCH 80 / SCH 160 |
| 3" | 88.9 | SCH 40 / SCH 80 / SCH 160 |
| 4" | 114.3 | SCH 40 / SCH 80 / SCH 160 |
| 6" | 168.3 | SCH 40 / SCH 80 / SCH 160 |
| 8" | 219.1 | SCH 40 / SCH 80 / SCH 160 / XXS |
| 10" | 273 | SCH 40 / SCH 80 / SCH 160 / XXS |
| 12" | 323.9 | SCH 40 / SCH 80 / SCH 160 / XXS |
| 16" | 406.4 | SCH 40 / SCH 80 / SCH 160 / custom |
| 20" | 508 | SCH 40 / SCH 80 / SCH 160 / custom |
| 24" | 610 | SCH 40 / SCH 80 / SCH 160 / custom |
Custom outside diameter, wall thickness, length, bevel angle, marking and packing can be supplied according to project drawings or purchase specifications.
Common Applications of ASTM A335 P11 Pipe
ASTM A335 P11 seamless pipe is commonly used in industries where pipe systems must withstand high temperature, pressure and long-term service conditions.
Power Plant
Used for steam lines, boiler piping, superheater systems, reheater lines, headers and high-temperature pressure pipelines.
Petrochemical Plant
Used for process piping, high-temperature hydrocarbon service, refinery units, catalytic cracking systems and pressure piping networks.
Boiler and Pressure Equipment
Used in boiler construction, pressure vessel connection piping, heat recovery systems and high-temperature auxiliary systems.
Refinery and Oil & Gas
Used for hot process media, refinery piping, high-pressure systems and equipment connection lines.
Heat Exchanger System
Used for manifold piping, connecting pipes, high-temperature transfer lines and industrial heat exchange equipment.
P11 Pipe vs P22 Pipe vs P91 Pipe
| Grade | Alloy Type | Main Feature | Typical Application |
| P11 | 1.25Cr-0.5Mo | Balanced high-temperature performance and cost | Boiler, steam line, refinery piping |
| P22 | 2.25Cr-1Mo | Higher strength and better elevated-temperature resistance than P11 | Power plant, petrochemical pressure piping |
| P91 | 9Cr-1Mo-V-Nb | Higher creep strength for more severe service | High-temperature power plant and critical pressure systems |
P11 is often selected when the project requires chrome moly performance but does not need the higher alloy cost of P22 or P91. Final grade selection should be based on design temperature, pressure, fluid medium, welding procedure and engineering code requirements.
Related P11 Piping Components
For complete pressure piping systems, ASTM A335 P11 pipe is commonly used together with matching fittings and flanges.
| Component | Recommended Standard |
| Seamless Pipe | ASTM A335 P11 / ASME SA335 P11 |
| Butt Weld Fittings | ASTM A234 WP11 |
| Forged Flanges | ASTM A182 F11 |
| Pressure Vessel Plate | ASTM A387 Grade 11 |
| Large Diameter Welded Pipe Alternative | ASTM A691 1-1/4Cr |
We can support buyers with pipe, fittings, flanges and related alloy steel materials according to project BOM requirements.
Heat Treatment and Welding Considerations
ASTM A335 P11 pipe is suitable for fusion welding, but proper welding control is important for pressure piping systems. Preheating, interpass temperature control and post-weld heat treatment may be required depending on wall thickness, design code and project specification.
For welded piping systems, buyers should confirm:
Welding procedure specification
Preheat requirement
PWHT requirement
Filler metal selection
Hardness control after welding
NDT requirement after fabrication
Engineering code or project standard
We can supply pipes with heat treatment records, MTC, batch traceability and additional testing documents to support project fabrication and quality approval.
Inspection and Quality Control
Xi'an Dongmeng Group Co., Ltd. follows a strict inspection process for ASTM A335 P11 seamless pipe before shipment.
Raw Material Inspection
Heat number verification
Chemical composition analysis
Material grade confirmation
Mill certificate review
Dimensional Inspection
Outside diameter check
Wall thickness check
Length inspection
Straightness inspection
End bevel and surface inspection
Mechanical and NDT Testing
Tensile test
Yield strength test
Elongation test
Hardness test
Hydrostatic test
Ultrasonic testing
Additional third-party inspection on request
Documentation
MTC EN 10204 3.1
MTC EN 10204 3.2 on request
Heat treatment record
Packing list
Commercial invoice
Certificate of origin if required
SGS / BV / TÜV / Intertek inspection support
Export Packing and Marking
ASTM A335 P11 pipes are packed for international shipment to reduce damage during handling, storage and sea transportation.
Standard Packing
Steel strip bundle packing
Plastic end caps
Waterproof wrapping
Anti-rust oil or varnish coating
Bundle labels
Shipping marks
Container loading support
Custom Packing
Wooden box or wooden frame for small sizes
Special marking according to project code
Color coding by grade
Barcode label
Heat number label
Customer logo or project tag on request
What Information Should Buyers Provide for a Fast Quotation?
To help us quote accurately, please send the following information:
Standard: ASTM A335 / ASME SA335
Grade: P11
Pipe size: OD or NPS
Wall thickness: SCH or mm
Quantity: meters, pieces or tons
Length: 6m, 12m, SRL, DRL or cut length
Pipe ends: PE, BE or threaded
Testing requirement: hydrostatic test, UT, third-party inspection
Certificate requirement: MTC 3.1 or 3.2
Destination port
Required delivery time
Our sales and technical team will provide quotation, weight calculation, delivery schedule and document support for your project
Our A335 P11 Warehouse
Our Experience in Alloy Steel Pipe Supply
We have extensive experience supplying ASTM A335 P11 chrome moly pipes to power plants, refineries, and petrochemical projects worldwide. Our products are used in high-temperature steam systems, boiler construction, and industrial pressure pipelines.
✔ Export experience to Middle East, Europe, Southeast Asia
✔ Project supply for power generation and refinery systems
✔ Customized pipe sizes and heat treatment solutions
Technical Expertise – ASTM A335 P11 Pipe
ASTM A335 P11 is a 1.25% Chromium – 0.5% Molybdenum alloy steel pipe designed for high-temperature service. It provides excellent:
Creep resistance under elevated temperature
Oxidation resistance in steam environments
Mechanical stability in pressure systems
Weldability with proper post-weld heat treatment
We strictly follow ASTM A335 / ASME SA335 standards, ensuring full compliance with international engineering requirements.
Standards & Compliance
Our ASTM A335 P11 pipes are manufactured according to:
ASTM A335 / ASME SA335 Standard
ASME Boiler and Pressure Vessel Code (BPVC)
EN / ISO international quality systems
Inspection & certification includes:
Mill Test Certificate (EN 10204 3.1 / 3.2)
Hydrostatic Testing
Ultrasonic Testing (UT)
Third-party inspection (SGS / BV / TUV available)
Quality Assurance System
We implement a strict quality control system for all ASTM A335 P11 pipes:
Raw material chemical composition verification
Heat treatment monitoring
Dimensional inspection
Non-destructive testing (NDT)
Final export inspection before shipment
All pipes are traceable with full batch numbers and inspection reports.
Why Choose Xi'an Dongmeng Group Co., Ltd.?
Xi'an Dongmeng Group Co., Ltd. supplies alloy steel pipe, chrome moly pipe, stainless steel pipe, carbon steel pipe and related industrial metal products for global B2B buyers.
Our Advantages
ASTM A335 / ASME SA335 P11 pipe supply experience
Support for project BOM and mixed-size orders
Custom cutting, beveling and marking available
MTC 3.1 / 3.2 and third-party inspection support
Strict inspection before shipment
Export seaworthy packing
Global delivery experience
Fast response for engineering and procurement teams
We understand that B2B buyers need more than a price. You need the right material, reliable documents, correct packing and on-time delivery. Our team can support your procurement process from technical confirmation to final shipment.
Frequently Asked Questions (FAQ): ASTM A335 P11 / ASME SA335 P11 Seamless Pipe
What is ASTM A335 P11 pipe?
ASTM A335 P11 pipe is a seamless ferritic chrome moly alloy steel pipe designed for high-temperature service. It is commonly used in boilers, power plants, refineries, petrochemical plants and industrial pressure piping systems.
Is ASTM A335 P11 seamless or welded?
ASTM A335 P11 is a seamless alloy steel pipe specification. For large diameter welded chrome moly pipe, ASTM A691 1-1/4Cr may be considered depending on project requirements.
What is the main difference between P11 and P22?
P11 is a 1.25Cr-0.5Mo alloy steel, while P22 is a 2.25Cr-1Mo alloy steel. P22 generally offers higher elevated-temperature performance, while P11 provides a balanced solution for many boiler, steam and refinery piping systems.
What fittings and flanges match ASTM A335 P11 pipe?
ASTM A234 WP11 fittings and ASTM A182 F11 flanges are commonly used with ASTM A335 P11 pipe in pressure piping systems.
Can you provide MTC for P11 pipe?
Yes. We can provide MTC EN 10204 3.1 as standard and EN 10204 3.2 with third-party inspection when required.
Can ASTM A335 P11 pipe be welded?
Yes. P11 pipe is suitable for fusion welding, but proper preheating, interpass temperature control and post-weld heat treatment may be required according to wall thickness, design code and project requirements.
What sizes can you supply?
We can supply ASTM A335 P11 pipe in common sizes from NPS 1/2" to 24", with SCH 40, SCH 80, SCH 160, XS, XXS and customized wall thickness options.
Do you support third-party inspection?
Yes. SGS, BV, TÜV, Intertek or other third-party inspection can be arranged according to the buyer's project requirement.
What is the lead time?
Lead time depends on size, quantity, testing requirement and stock condition. Standard sizes may be available faster, while large-diameter, heavy-wall or customized orders require confirmation according to production schedule.
How can I get an accurate quotation?
Please send standard, grade, size, wall thickness, quantity, length, pipe ends, testing requirement, certificate requirement and destination port. We will provide a detailed quotation with delivery schedule and packing plan.
Contact Us
Xi'an Dongmeng Group Co., Ltd.
ASTM A335 P11 Pipe Supplier | Chrome Moly Seamless Pipe for High-Temperature Service
Email: office@dongmjd.com
WhatsApp / WeChat: +8615769214734
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