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As a leading supplier in industrial materials, we specialize in ASTM A335 P11 Pipe (also known as ASME SA335 P11), a superior Chrome Moly Alloy Seamless Pipe engineered for high-temperature services. This grade boasts a precise chemical composition of 1.00-1.50% Chromium and 0.44-0.65% Molybdenum, delivering robust mechanical properties including a minimum tensile strength of 415 MPa and yield strength of 205 MPa. Renowned for its high toughness, wear, and tear resistance, ASTM A335 P11 is widely utilized to produce critical components like ASTM A234 WP11 pipe fittings (elbows, tees, reducers) and ASTM A182 F11 flanges. Additionally, it aligns with equivalent standards such as ASTM A387 Grade 11 steel plates and ASTM A691 1-1/4 CR welded pipes. Our seamless pipes guarantee optimal performance in bending, flanging, and fusion welding processes, making them the ideal choice for demanding industrial applications.
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ASTM A335 P11 Chemical Composition
| C, % | S, % | Si, % | Mn, % | P, % | Cr, % | Mo, % |
| 0.015 Maximum | 0.025 Maximum | 0.50 Maximum | 0.30-0.60 | 0.025 Maximum | 4.00-6.00 | 0.45-0.65 |
ASTM A335 P11 EFW Pipes Mechanical Properties Table
| Tensile Strength, in MPa | Yield Strength, in MPa | Elongation, % |
| 415 minimum | 205 minimum | 30 minimum |
AS P11 Grade Material Size Chart In Mm
| ASTM A335 P11 Pipe OD mm |
Pipe WT mm |
in. | Sch | Kg/m |
|---|---|---|---|---|
| 13.72 | 1.65 | 1/4 | 10S | 0.50 |
| 13.72 | 2.24 | 1/4 | 40S | 0.64 |
| 13.72 | 3.02 | 1/4 | 80S | 0.81 |
| 17.15 | 1.65 | 3/8 | 10S | 0.64 |
| 17.15 | 2.31 | 3/8 | 40S | 0.86 |
| 17.15 | 3.20 | 3/8 | 80S | 1.12 |
| 21.34 | 2.11 | 1/2 | 10S | 1.02 |
| 21.34 | 2.77 | 1/2 | 40S | 1.29 |
| 21.34 | 3.73 | 1/2 | 80S | 1.65 |
| 26.67 | 2.11 | 3/4 | 10S | 1.30 |
| 26.67 | 2.87 | 3/4 | 40S | 1.71 |
| 26.67 | 3.91 | 3/4 | 80S | 2.23 |
| 33.40 | 2.77 | 1 | 10S | 2.13 |
| 33.40 | 3.38 | 1 | 40S | 2.54 |
| 33.40 | 4.55 | 1 | 80S | 3.29 |
| 33.40 | 6.352) | 1 | 160 | 4.30 |
| 42.16 | 2.77 | 1¼ | 10S | 2.73 |
| 42.16 | 3.56 | 1¼ | 40S | 3.44 |
| 42.16 | 4.85 | 1¼ | 80S | 4.53 |
| 42.16 | 6.352) | 1¼ | 160 | 5.69 |
| 48.26 | 2.77 | 1½ | 10S | 3.16 |
| 48.26 | 3.68 | 1½ | 40S | 4.11 |
| 48.26 | 5.08 | 1½ | 80S | 5.49 |
| 60.33 | 2.77 | 2 | 10S | 3.99 |
| 60.33 | 3.91 | 2 | 40S | 5.52 |
| 60.33 | 5.54 | 2 | 80S | 7.60 |
| 60.33 | 8.742) | 2 | 160 | 11.29 |
| 73.03 | 3.05 | 2½ | 10S | 5.35 |
| 73.03 | 5.16 | 2½ | 40S | 8.77 |
| 73.03 | 7.01 | 2½ | 80S | 11.59 |
| 88.90 | 3.05 | 3 | 10S | 6.56 |
| 88.90 | 5.49 | 3 | 40S | 11.47 |
| 88.90 | 7.62 | 3 | 80S | 15.51 |
| 88.90 | 11.132) | 3 | 160 | 21.67 |
| 101.60 | 3.05 | 3½ | 10S | 7.53 |
| 101.60 | 5.74 | 3½ | 40S | 13.78 |
| 101.60 | 8.08 | 3½ | 80S | 18.92 |
| 114.30 | 3.05 | 4 | 10S | 8.50 |
| 114.30 | 6.02 | 4 | 40S | 16.32 |
| 114.30 | 8.56 | 4 | 80S | 22.67 |
| 114.30 | 13.492) | 4 | 160 | 34.05 |
| 141.30 | 6.55 | 5 | 40S | 22.10 |
| 141.30 | 9.53 | 5 | 80S | 31.44 |
| 141.30 | 15.882) | 5 | 160 | 49.87 |
| 168.28 | 3.4 | 6 | 10S | 14.04 |
| 168.28 | 7.11 | 6 | 40S | 28.69 |
| 168.28 | 10.97 | 6 | 80S | 43.21 |
| 168.28 | 14.27 | 6 | 120 | 54.75 |
| 168.28 | 18.262) | 6 | 160 | 68.59 |
| 219.08 | 8.18 | 8 | 40S | 43.20 |
| 219.08 | 12.7 | 8 | 80S | 65.63 |
| 219.08 | 18.23 | 8 | 120 | 91.30 |
| 219.08 | 23.012) | 8 | 160 | 112.97 |
SA335 Gr P11 High Pressure Steel Pipe Material Specification
| Size in Inch | 1/8NB TO 24NB inch |
| ASTM Standards | ASTM A 335, and ASME SA 335 |
| Type | Seamless Pipe |
| Specialized in Size | Large Diameter Size |
| Outer Dimensions Chart | 19.05milimeter – 114.3milimeter |
| Wall Thickness Chart | 2.0milimeter – 14 milimeter |
| Length in milimeter | max 16000milimeter |
| Schedule Chart | Schedule 20 - XXS up to 250 milimeter thk. |
| Pipe Form | Round, Rectangular, Square, Hydraulic Etc. |
| Length | Single, Double Random & Cut to Length. |
| Pipe & Tube End | Plain, Beveled, Treaded. |
Products Description
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.
Frequently Asked Questions (FAQ): ASTM A335 P11 / ASME SA335 P11 Seamless Pipe
Q1: What are the key applications for ASTM A335 P11 pipe? When should we specify this grade?
A: ASTM A335 P11 is specifically designed for high-temperature service. You should specify it for power generation boilers, petroleum refineries, chemical plants, and process industry systems involving steam, hydrocarbons, and other elevated-temperature media. It is ideal for pressure piping systems, superheaters, and heat exchangers operating at high temperatures.
Q2: What is the fundamental difference between Seamless (A335 P11) and Welded (A691 1-1/4CR) pipe for this grade?
A: The core difference is the manufacturing process.
A335 P11 is a seamless pipe, meaning it has no longitudinal weld seam. It is the preferred choice for higher-pressure and critical service applications due to its inherent uniformity in pressure containment.
A691 1-1/4CR is a welded pipe formed from plate and then fusion-welded. It is a cost-effective alternative for large diameters or less severe service conditions, but the weld seam must be considered a potential point of weakness under cyclic loading.
Q3: We need to fabricate fittings. Which standards apply for elbows, tees, and flanges made from P11 material?
A: For a complete P11 piping system, the corresponding component standards are:
Pipe Fittings (Elbows, Tees, Reducers): ASTM A234 WP11
Flanges: ASTM A182 F11
These standards ensure the chemical and mechanical properties of the fittings and flanges match those of your A335 P11 pipe, guaranteeing system integrity during welding and operation.
Q4: Can we source P11 material in plate form for custom fabrication? What is the equivalent standard?
A: Yes. The equivalent material for plates is ASTM A387 Grade 11 (ASME SA387 Gr 11). This chrome-moly alloy steel plate is used for manufacturing pressure vessels, boilers, and other fabricated components that will be welded to your A335 P11 piping system.
Q5: What are the welding considerations for A335 P11 pipe?
A: P11 is known for good weldability, but it requires pre-heat and post-weld heat treatment (PWHT) to prevent cracking and relieve stresses. The specific procedures (pre-heat temperature, interpass temperature, and PWHT parameters) must be developed by a qualified welding engineer according to relevant codes like ASME Section IX. Using matching or compatible filler metals is critical.
Q6: What is your standard certification and testing package for A335 P11 pipe?
A: We supply all material with a full Material Test Certificate (MTC) or Mill Test Certificate (MTC) as per EN 10204 / 3.1 or 3.2. This certifies compliance with ASTM A335 and includes results for chemical analysis, tensile strength, yield strength, elongation, and hardness tests. Additional NDE testing like Hydrostatic Testing, Ultrasonic Testing (UT), or Dye Penetrant Testing (PT) can be provided upon request.
Q7: What are your standard available sizes, schedules (wall thickness), and delivery terms?
A: We stock and supply A335 P11 pipe in a wide range of sizes, typically from NPS 1/2" to NPS 24". Common schedules include SCH 40, SCH 80, SCH 160, and XXS. We can also supply to specific outside diameter and wall thickness requirements as per ASME B36.10M. Delivery terms are typically FCA (Free Carrier) or EXW (Ex Works), with CIF/FOB options for international shipments.
Q8: How does A335 P11 compare to other common chrome-moly grades like P5, P9, or P22?
A: The primary difference is in the alloy content, which dictates high-temperature performance (creep strength, oxidation resistance).
P11 (1.25Cr-0.5Mo) offers a balanced performance for many refinery and power applications.
P5/P9 have higher chromium for better corrosion/oxidation resistance.
P22 (2.25Cr-1Mo) has higher chromium and molybdenum, providing superior strength at elevated temperatures.
Selection depends on the specific design temperature, pressure, and service environment of your project.
Q9: Do you offer traceability and compliance with international pressure equipment directives?
A: Absolutely. We guarantee full traceability from the original mill heat number to the final delivered product. Our materials and documentation support compliance with major international standards and directives, including the ASME Boiler and Pressure Vessel Code, PED (Pressure Equipment Directive) 2014/68/EU with CE marking, and other regional requirements.
Q10: What is your lead time for standard and non-standard (custom) orders?
A: For standard sizes and schedules, we often have stock or can deliver within a short timeframe (e.g., 2-4 weeks). For large-diameter, heavy-wall, or custom-length orders, lead times will vary based on mill production schedules, typically ranging from 8 to 16 weeks. We provide firm lead times with every quotation.
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