ASTM A335 P11 Alloy Steel Pipes Manufacturer in India
ASTM A335 P11 Alloy Steel Pipes Manufacturer in India
Sachiya Steel International has been serving the industrial piping sector since 2005, with its head office in Mumbai and manufacturing operations in Vasai. As an ASTM A335 P11 Alloy Steel Pipes Manufacturer in India, we supply industrial pipes and tubes to customers in 85+ countries. Our product range covers stainless steel, duplex, carbon steel, alloy steel, and nickel alloy materials for industries such as oil and gas, power generation, petrochemicals, and engineering.
ASTM A335 P11 Alloy Steel Pipes are seamless chromium-molybdenum pipes used in high-temperature applications. Their chromium and molybdenum content helps maintain strength under heat and improves resistance to oxidation. We supply pipes according to ASTM A335 / ASME SA335 specifications, with sizes and wall thicknesses based on project needs. Our ISO 9001:2015, ISO 14001:2015, and applicable TÜV certifications support our focus on quality, while EN 10204 3.1 mill test certificates help provide material traceability.
What Are ASTM A335 P11 Alloy Steel Pipes?
ASTM A335 P11 Alloy Steel Pipes are seamless chromium-molybdenum steel pipes designed for high-temperature and high-pressure applications. Also identified by UNS K11597, P11 contains approximately 1.25% chromium and 0.5% molybdenum, along with silicon and other elements that contribute to its performance under heat.
Each element serves a purpose. Chromium improves resistance to oxidation, molybdenum helps the steel retain strength at elevated temperatures, and silicon supports resistance to scaling. These properties make P11 pipes suitable for boiler systems, steam lines, refinery equipment, and power plants. They can also be processed for bending, flanging, and fusion welding using suitable procedures, making them practical for industrial piping installation and fabrication.
ASTM A335 P11 Alloy Steel Pipes
High-quality ASTM A335 P11 Alloy Steel Pipes manufactured for demanding industrial applications across oil & gas, petrochemical, chemical processing, power generation, refineries, boilers and engineering industries. Available in various sizes, wall thicknesses and specifications, conforming to ASTM A335 P11 standards for high-temperature service.
Types of ASTM A335 P11 Alloy Steel Pipes
As an ASTM A335 P11 Alloy Steel Pipes Manufacturer, we supply seamless pipes in different dimensions and forms to suit the needs of boilers, power plants, refineries, and industrial processing units. The right option depends on the operating pressure, temperature, pipe size, and installation method.
- Hot-Finished P11 Pipes: Suitable for industrial piping systems that require reliable performance under sustained heat.
- Cold-Drawn P11 Pipes: Offer closer dimensional tolerances and a smoother surface, particularly for smaller diameters.
- Thin-Wall P11 Pipes: Available for applications where the design allows a lower wall thickness and reduced pipe weight.
- Heavy-Wall P11 Pipes: Used in systems that require thicker walls to meet specified pressure and design conditions.
- Bending-Quality P11 Pipes: Selected for applications involving pipe bends and formed sections, subject to the required bending procedure.
- Large-Diameter P11 Pipes: Suitable for piping layouts that need larger bores for fluid or steam flow.
- Bevelled-End P11 Pipes: Prepared with angled ends to support welding during site installation.
We supply ASTM A335 P11 Alloy Steel Pipes in different sizes, schedules, and wall thicknesses according to applicable standards and project specifications. Heat treatment, inspection, and material documentation can be arranged based on order requirements.
Why Choose Us as Your ASTM A335 P11 Alloy Steel Pipes Manufacturer in India?
Choosing the right pipe manufacturer helps you meet project specifications, control costs, and keep work on schedule. Since 2005, we have supplied industrial pipes and tubes for demanding engineering applications. Our manufacturing and supply capabilities support orders of different sizes, with a monthly supply capacity of up to 100 tons.
- Industry Experience: We have been manufacturing, supplying, and exporting industrial piping products for over 20 years.
- Wide Size Range: We supply ASTM A335 P11 Alloy Steel Pipes in different diameters, schedules, and wall thicknesses to meet project requirements.
- Quality Standards: Our ISO 9001:2015 and applicable TÜV certifications support our commitment to consistent quality and inspection.
- Material Documentation: We provide EN 10204 3.1 mill test certificates, with additional inspection arrangements available when required.
- Multiple Material Options: Our range includes stainless steel, duplex, carbon steel, alloy steel, and nickel alloy pipes and tubes.
- Global Supply Network: We export to customers in 85+ countries and coordinate export packing and shipping documents for international orders.
With experience across different industrial sectors, we work to make sourcing and delivery straightforward. we support domestic and international requirements with suitable pipe specifications, material traceability, and supply arrangements tailored to each order.
Types of Pipes & Tubes
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ASTM A335 P11 Alloy Steel Pipes Specifications
| Item | Detail |
|---|---|
| Material | Chrome-moly alloy steel, 1¼Cr-½Mo-Si |
| Grade | ASTM A335 P11 |
| UNS / EN | K11597 / 1.7335 (13CrMo4-5) |
| Make | Seamless |
| Nominal Bore | ½" to 24" NB, with custom sizes on request |
| Wall Range | Sch 20 up to XXS, or as drawn |
| Pipe Dimensions | ASME B36.10M |
| Delivered In | Single random, double random, or cut lengths |
| End Preparation | Plain, beveled or threaded |
| Heat Treatment | Full or isothermal anneal, or normalize and temper |
| Finish | Black, varnished or painted |
| Inspection | Chemical, tensile, flattening, hydrostatic or NDE, PMI |
| Paperwork | EN 10204 3.1, with 3.2 on request |
ASTM A335 P11 Alloy Steel Pipes Standards
The main reference is ASTM A335 / ASME SA335, which covers seamless ferritic alloy pipe for high-temperature service. Its general rules on tolerances, marking and testing come from ASTM A999. Pipe sizes follow ASME B36.10M.
Related parts keep the grade consistent across the system. ASTM A213 T11 is the tube version for boilers and exchangers, ASTM A234 WP11 covers butt-weld fittings, and ASTM A182 F11 covers forged flanges. For very large welded sizes, ASTM A691 1¼CR is the plate-based option.
Teams working to European codes can use EN 10216-2, which covers 13CrMo4-5.
Every lot is tested for chemistry, tensile strength and flattening, then pressed through a hydrostatic test or NDE as the code demands. A positive material identification step checks chromium and molybdenum on the pipe itself, and a third-party inspector can witness the work if you ask.
ASTM A335 P11 Alloy Steel Pipes Material and Grades
P11 belongs to the low-chrome end of the A335 family, below P22 and well below P9 or P91. ASTM A335 allows 1.00–1.50% chromium and 0.44–0.65% molybdenum, with silicon of 0.50–1.00%, which is higher than in P22.
That extra silicon is the reason P11 handles oxidation a little better than its chrome content suggests. It also means P11 is usually a shade easier to weld than the higher-chrome pipes, with less risk of hard, brittle weld zones.
Buyers who specify P11 usually do so for design temperatures up to about 550 °C. Beyond that, P22 or P91 normally takes over. If your drawing adds hardness limits or impact testing, mention it when you enquire so the heat can be chosen and tested to suit.
ASTM A335 P11 vs P22 Alloy Steel Pipes
These two are the closest pair on any boiler or refinery line list, and the choice comes down to heat and hydrogen.
P22 carries about 2¼% chromium and 1% molybdenum, so it resists scaling and creep better and sits higher on the temperature scale. P11 carries about half that chromium and molybdenum, so it costs less and welds with less fuss.
Both reach the same minimum strength at room temperature, 415 MPa tensile and 205 MPa yield. The difference appears when the pipe gets hot, because P22 is allowed a higher stress at high temperature. Pick P11 when your design temperature fits within its range and you want an economical, easily fabricated pipe. Pick P22 when the line runs hotter, carries more hydrogen or needs longer life under creep.
Elevated Temperature and Corrosion Performance of ASTM A335 P11 Alloy Steel Pipes
P11 does well in hot steam and process service. Its chromium and silicon form a protective scale in air, and the molybdenum slows creep, which is the slow stretch metal suffers under heat and load. Most designs use it up to around 550 °C.
In hot hydrogen service, it outperforms carbon steel and C-½Mo, within the limits of the Nelson curves. Sulfur resistance is moderate, so for sulfur-heavy crude streams a higher-chrome pipe such as P5 or P9 is the safer choice.
One long-term matter deserves attention. In extended service between roughly 375 and 575 °C, some chrome-moly steels can lose toughness, a change known as temper embrittlement. Controlling tramp elements in the steel helps, and many refinery specifications set limits for them. If that applies to your unit, tell us before you order.
For welding, preheat of about 150–200 °C and post-weld heat treatment of about 700–750 °C are typical. Your welding procedure specification has the final word.
P11 is not stainless. It will rust in damp air, so keep pipe varnished or painted until it goes into service.
ASTM A335 P11 Alloy Steel Pipes Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 1.00 – 1.50 |
| Molybdenum (Mo) | 0.44 – 0.65 |
| Iron (Fe) | Balance |
Limits per ASTM A335 for grade P11.
ASTM A335 P11 Alloy Steel Pipes Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength | 415 MPa (60 ksi) min |
| Yield Strength | 205 MPa (30 ksi) min |
| Elongation (longitudinal) | 30% min |
| Density | approx. 7.85 g/cm³ |
| Condition | Annealed, or normalized and tempered |
Allowable stress for P11 falls as the temperature rises. For design, take the wall thickness from your code tables at the working temperature, not from these room-temperature numbers.
ASTM A335 P11 Alloy Steel Pipes Size and Weight Chart
Weight per metre = (OD − wall) × wall × 0.02466, with OD and wall in mm. Use the result as an estimate, since the real weight shifts with the wall tolerance.
| NPS | OD (mm) | Schedule | Wall (mm) | Weight (kg/m) |
|---|---|---|---|---|
| 1¼" | 42.2 | 40 | 3.56 | 3.39 |
| 1¼" | 42.2 | 80 | 4.85 | 4.47 |
| 2½" | 73.0 | 40 | 5.16 | 8.63 |
| 2½" | 73.0 | 80 | 7.01 | 11.41 |
| 6" | 168.3 | 40 | 7.11 | 28.26 |
| 6" | 168.3 | 80 | 10.97 | 42.56 |
| 10" | 273.1 | 40 | 9.27 | 60.31 |
| 10" | 273.1 | 80 | 15.09 | 96.01 |
| 16" | 406.4 | 40 | 12.70 | 123.30 |
| 16" | 406.4 | 80 | 21.44 | 203.53 |
| 20" | 508.0 | 40 | 20.62 | 247.83 |
| 20" | 508.0 | 80 | 32.54 | 381.53 |
Heavier Sch 160 and XXS weights, and any other size, are available as a full chart on request.
ASTM A335 P11 Alloy Steel Pipes Sizes, Dimensions and Schedules
Our P11 pipes run from ½" to 24" NB. Light schedules such as 20 and 40 fit lower-pressure steam and heater lines, while Sch 80, 160 and XXS go to high-pressure headers and main steam. The right wall comes from your design pressure and temperature, and we can help you check it.
Where a standard size will not do, we can make odd OD and wall pairings to your drawing. Pipes ship in single random, double random or cut lengths, with plain, beveled or threaded ends. A varnish or paint coat is applied before dispatch to keep rust off during transit and storage.
Common Materials Related to ASTM A335 P11 Alloy Steel Pipes
When planning a high-temperature piping system, material grades must match the operating conditions and engineering specifications. Along with P11 alloy steel pipes, related grades and piping components may be required for boilers, steam lines, and refinery installations.
ASTM A335 P11: A chromium-molybdenum alloy steel grade containing approximately 1.25% chromium and 0.5% molybdenum, used in high-temperature piping.
ASTM A335 P5: A higher-chromium alloy steel grade considered for applications with specific oxidation and heat-resistance requirements.
ASTM A335 P9: A 9% chromium alloy steel grade used in selected high-temperature process systems.
ASTM A335 P22: A chromium-molybdenum grade widely specified for boilers, power plants, and refinery equipment.
ASTM A213 T11: A related alloy steel tube grade used in boilers, superheaters, and heat exchangers.
ASTM A234 WP11 Fittings: Alloy steel elbows, tees, reducers, and other fittings for compatible piping systems.
ASTM A182 F11 Flanges: Forged alloy steel flanges used to connect pipes and equipment where the grade suits the design conditions.
As experienced ASTM A335 P11 Alloy Steel Pipes Suppliers, we understand the importance of matching each material to the correct product specification. Grade selection and compatibility should be confirmed against the project's design code, operating conditions, and material requirements.
ASTM A335 P11 Alloy Steel Pipes We Manufacture and Supply
We make P11 seamless pipe in hot finished and cold drawn forms, from small-bore lines to large headers, and we supply P11 tubes, fittings and flanges to go with it. This means a boiler package or heater job can be sourced as one lot with matching heat numbers. Annealing, normalizing and tempering, straightening, cutting and beveling are all done on our own premises. That is how we handle special lengths and end preparations quickly, and it is how every pipe stays linked to its heat. As an ASTM A335 P11 Alloy Steel Pipes Manufacturer, we also pack for your route, using bundles for local delivery and crates for export.
ASTM A335 P11 Alloy Steel Pipes Applications
- Power Boilers: Superheater and reheater piping, steam headers and main steam lines.
- Refinery Heaters: Furnace piping and heater outlets running at moderate-to-high heat.
- Hydroprocessing Units: Lines that carry hot hydrogen at temperatures within Nelson curve limits.
- Petrochemical Plants: Process piping in cracking, reforming and steam systems.
- Heat Exchangers: Pipework around exchangers and waste-heat recovery units.
- Combined Cycle Plants: Steam piping on the lower-temperature side of heat recovery boilers.
- Oil and Gas Processing: Hot process lines at gas plants, terminals and compressor stations.
- Fertilizer and Chemical Works: Steam and hot gas lines in process units.
Why Choose Us as Your ASTM A335 P11 Alloy Steel Pipes Manufacturer in India?
We supply ASTM A335 P11 Alloy Steel Pipes for high-temperature and high-pressure applications. Since 2005, we have served industrial buyers with a focus on quality, material traceability, and on-time delivery. Our manufacturing and export capacity reaches 100 tons per month, helping us handle both regular orders and bulk requirements.
Quality You Can Verify: We provide heat number traceability and EN 10204 Type 3.1 material test certificates with our pipes. We can also arrange Positive Material Identification (PMI) and third-party inspection as required.
Certified Quality Systems: We hold ISO 9001:2015, ISO 14001:2015, TÜV, and MSME credentials. We can arrange Type 3.2 certification and third-party inspection based on your project requirements.
Multiple Grades and Sizes: We supply ASTM A335 alloy steel pipes in P5, P9, P11, P22, P91, and P92 grades. Share your required diameter, wall thickness, schedule, and length so we can confirm availability.
Manufacturing and Export: We handle orders of different sizes and export pipes to international markets. Our team manages export packing and shipping documents to help keep your order moving smoothly.
Help Choosing the Right Grade: Not sure whether P11 or P22 suits your application? Our team can review your operating temperature, pressure, and technical specifications to help you identify the appropriate grade.
As an experienced ASTM A335 P11 Alloy Steel Pipes Supplier in India, we focus on clear communication, reliable documentation, and smooth order handling—from your first enquiry to final delivery.
Countries We Export ASTM A335 P11 Alloy Steel Pipes To
Boiler makers, refiners and EPC contractors in 85+ countries rely on us for P11 pipe. As an ASTM A335 P11 Alloy Steel Pipes Manufacturer and Supplier in India, we ship to markets that include:
North America: USA, Canada, Mexico
Europe: Germany, United Kingdom, France, Italy, Netherlands, Spain, Belgium
Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain
Asia-Pacific: Singapore, Malaysia, Indonesia, Australia, Japan, South Korea, Thailand
Africa: South Africa, Nigeria, Egypt, Kenya, Algeria
South America: Brazil, Argentina, Chile, Colombia
Test certificates to EN 10204 3.1 accompany every shipment, and 3.2 certification or inspection by a third party can be set up before the pipes leave. For sea freight, pipes are varnished or painted, capped at both ends, and bundled or crated. The invoice, packing list and certificates are prepared to match your port and customs needs.