Material Grade :
ASTM A335 P91 / ASTM A691 P91
Material Grade :
ASTM A335 P91 / ASTM A691 P91
Product Configuration :
Seamless, Welded, ERW, EFW
Heat Treatment :
Normalized and Tempered
Equivalent Designation :
UNS K91560 / EN X10CrMoVNb9-1 / WNR 1.4903
Alloy Steel P91 Pipes & Tubes are manufactured using advanced production technologies and high-grade raw materials to meet stringent international standards. Designed for strength, reliability, and adaptability, these components cater to a broad range of industrial applications across national and global markets.
Composed primarily of chromium and molybdenum, along with vanadium, niobium, and other alloying elements, P91 Pipes & Tubes exhibit exceptional thermal stability, corrosion resistance, and mechanical strength. These elements enhance tensile and creep strength, particularly when subjected to cold working processes, making them an ideal choice for high-stress environments.
Available Forms and Sizes: Seamless, welded, and fabricated variants, Offered in single random, double random, and custom lengths, Supplied in a variety of diameters and wall thicknesses.
These pipes are engineered to be easily molded into desired configurations as per customer requirements, ensuring versatility across diverse industrial sectors.
It’s Standards and Specifications: ASTM A/SA 335 Grade P91 Seamless Pipes, DIN 1.4903, UNS K91560, EN X10CrMoVNb9-1, Chrome Moly P91
Industrial Applications: Alloy Steel P91 Pipes & Tubes are extensively employed in sectors where operational temperatures vary from extremely low to exceedingly high. These include - Power generation plants, Petrochemical and oil & gas industries, Fossil fuel-based energy systems, Heat exchangers and boiler components, Marine engineering and offshore applications.
The high resistance to oxidation, pressure, and heat ensures that these pipes maintain performance integrity even under the most demanding conditions. Their ability to withstand elevated temperatures without compromising structural strength makes them a critical component in thermal and mechanical systems. And its key features like Excellent weldability and formability, Superior corrosion and oxidation resistance, High tensile and yield strength, Long service life with minimal maintenance and Cost-effective for high-efficiency operations.
Quality Assurance and Testing: To ensure consistency, each batch of P91 Pipes & Tubes undergoes comprehensive quality checks. This includes, Flattening tests, Radiographic examination, Intergranular corrosion resistance tests, Pitting and mechanical property evaluations.
Both chemical composition and physical durability are verified to guarantee that the products meet or exceed required industry specifications.
With their unmatched combination of strength, thermal efficiency, and durability, Alloy Steel P91 Pipes stand out as a preferred solution for critical infrastructure and high-performance engineering applications worldwide.
| STANDARD | Werkstoff /DIN | UNS | EN |
|---|---|---|---|
| A335 Grade P91 | 1.4903 | K91560 | X10CrMoVNb9-1 |
Alloy Steel P91 Seamless Pipes
Manufactured from ASTM A335 P91 alloy steel, these seamless pipes deliver outstanding creep strength, and long-term reliability for high-pressure steam lines, refineries, and power generation systems.
Chrome Moly P91 Seamless Pipes
Produced from 9Cr-1Mo-V chrome molybdenum alloy steel, P91 seamless pipes offer superior thermal fatigue resistance, and extended service life for demanding refinery, petrochemical, and power plant installations.
Alloy Steel P91 High Pressure Pipes
Engineered for elevated-pressure and high-temperature service, Alloy Steel P91 High Pressure Pipes provide exceptional mechanical strength, and pressure integrity for critical industrial process piping applications.
Material Grade :
ASTM A335 P91 / ASTM A691 P91
Product Configuration :
Seamless, Welded, ERW, EFW
Heat Treatment :
Normalized and Tempered
Equivalent Designation :
UNS K91560 / EN X10CrMoVNb9-1 / WNR 1.4903
Alloy Classification :
Chromium-Molybdenum-Vanadium (9Cr-1Mo-V) Alloy Steel
Service Temperature :
Suitable for prolonged service up to 650°C
Pressure Capability :
Designed for high-pressure steam and process piping
Welding Practice :
Preheating and Post Weld Heat Treatment (PWHT) Recommended
Creep Resistance :
Excellent long-term creep strength under elevated temperatures
Oxidation Resistance :
Superior resistance to oxidation and thermal fatigue
Inspection Compliance :
PMI, Hydrostatic Test, UT, RT, Hardness & Mechanical Testing
Typical Applications :
Power Plants, Boilers, Superheaters, Steam Pipelines, Refineries, Petrochemical Facilities
Chemical Composition of Alloy Steel P91 Seamless Pipes And Tubes
| Grade | C, % | Mn, % | P, % | S, % | Si, % | Cr, % | Mo, % |
|---|---|---|---|---|---|---|---|
| P91 | 0.08~0.12 | 0.30~0.60 | 0.02 | 0.01 | 0.20~0.50 | 8.00~9.50 | 0.85~1.05 |
Mechanical Properties Of ASME SA335 Alloy Steel P91 Pipe
| Grade | Tensile Strength, MPa | Yield Strength, MPa | Elongation, % |
|---|---|---|---|
| P91 | 585 min | 415 min | 20 min |
Our Alloy steel P91 Pipes and Tubes are used in a wide range of applications and various industries. Below are a few of them:
Application Industries
Aerospace Industry
Food Processing Industry
Pulp & Paper Indusry
Energy Industry
Pharmaceuticals Industry
Power Plant Industry
Chemical Industry
Oil and Gas Industry
Get clear answers to common queries about our steel products, services, and delivery processes.
Yes. KVN Steels supplies Alloy Steel P91 Pipes and Tubes across the United Arab Emirates, including Abu Dhabi, Dubai, Sharjah, Ajman, Ras Al Khaimah, and Fujairah. Our inventory includes seamless, welded, ERW, and EFW pipes and tubes in a wide range of sizes, schedules, and specifications to support power generation, refinery, and industrial piping projects.
Our product portfolio includes ASTM A335 P91 seamless pipes, ASTM A213 T91 boiler tubes, ASTM A691 P91 welded pipes, ERW pipes, EFW pipes, heat exchanger tubes, boiler tubes, superheater tubes, and custom cut-to-length solutions. All products are manufactured to internationally recognised ASTM and ASME specifications for demanding industrial applications.
Both grades are chromium-molybdenum alloy steels intended for elevated-temperature service; however, P91 contains approximately 9% chromium along with molybdenum and vanadium, providing significantly higher creep strength, oxidation resistance, and thermal stability than P22. Consequently, P91 is widely specified for ultra-high-pressure steam systems and advanced power generation facilities operating under severe temperature and pressure conditions.
The appropriate selection depends on operating temperature, design pressure, pipe dimensions, manufacturing process, applicable ASTM or ASME specifications, and the service environment. Reviewing these engineering requirements ensures the selected P91 pipes and tubes deliver optimum performance, extended service life, and compliance with project specifications.
Alloy Steel P91 offers exceptional creep resistance, oxidation resistance, thermal fatigue performance, and high-temperature mechanical strength. These properties make it a preferred material for critical steam pipelines, boilers, superheaters, heat recovery systems, and refinery process piping operating under prolonged elevated-temperature conditions.
Alloy Steel P91 Pipes and Tubes are extensively specified for thermal power stations, combined-cycle power plants, oil & gas processing facilities, petrochemical complexes, refineries, fertilizer plants, boilers, superheaters, heat exchangers, pressure vessels, and heavy industrial process piping requiring superior creep strength and long-term thermal stability.
Alloy Steel P91 Pipes and Tubes are commonly manufactured in accordance with ASTM A335, ASTM A213, ASTM A691, ASME SA335, ASME SA213, and applicable ASME B36.10M dimensional standards. Compliance with these internationally recognised specifications ensures dimensional accuracy, pressure integrity, mechanical reliability, and consistent material quality.
To ensure full compliance with international engineering and quality standards, Alloy Steel P91 Pipes and Tubes undergo comprehensive inspection procedures, including Positive Material Identification (PMI), Hydrostatic Pressure Testing, Ultrasonic Testing (UT), Radiographic Testing (RT), Hardness Testing, Dimensional Verification, Chemical and Mechanical Property Evaluation, and complete material traceability supported by Mill Test Certificates (MTCs) prior to dispatch.
Our Location
Flat no 5, Swapna HSG Soc
Ltd., Charkop, Kandivali West,
Mumbai, Maharashtra, India.
400067
