Alloy Steel Pipes Grades P5/P9/P11/P22/P91 Manufacturer, Supplier & Exporter in India – Mcneil Instruments
Mcneil Instruments is a leading manufacturer, supplier, and exporter of Alloy Steel Pipes in India, offering durable and high-performance piping solutions for industries that demand strength, temperature resistance, and reliability under pressure. Our range includes ASME SA335 / ASTM A335 P5, P9, P11, P22, and P91 Alloy Steel Pipes, designed to perform exceptionally in power plants, refineries, boilers, and petrochemical systems.
Each pipe is manufactured in strict accordance with international standards (ASTM / ASME / DIN) to ensure dimensional accuracy, leak-proof joints, and superior mechanical strength for high-temperature and high-pressure environments.
Grades We Offer
We are recognized as a leading manufacturer and supplier of P5, P9, P11, P22, and P91 grade alloy steel pipes designed to perform in demanding environments. We supply seamless alloy steel pipes in the following ASTM A335 grades:
P5 Pipes
P9 Pipes
P11 Pipes
P22 Pipes
P91 Pipes
ASME SA335 Grade P5 Alloy Steel Pipes
Alloy Steel P5 Pipes are known for their excellent resistance to oxidation and corrosion, combined with high tensile strength at elevated temperatures. They are ideal for steam boilers, superheaters, and heat exchangers in the energy and power sector.
✅ Technical Specification
| Parameter | Specification |
| Composition | Chromium 4–6%, Molybdenum 0.45–0.65% |
| Temperature Range | Up to 600°C |
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa |
| Hardness | ≤ 85 HRB |
| Standards | ASTM A335 / ASME SA335 |
Key Highlights:
- Excellent oxidation and corrosion resistance
- High strength for elevated temperature service
- Widely used in heat exchangers, pressure vessels, and boilers
ASME SA335 Grade P9 Alloy Steel Pipes
Alloy Steel P9 Pipes are designed for high-temperature, high-pressure applications and offer superior creep strength. They are commonly used in refineries, power plants, and industrial furnaces where consistent performance is vital.
✅ Technical Specification
| Parameter | Specification |
| Composition | Chromium 8–10%, Molybdenum 0.9–1.1% |
| Temperature Range | Up to 650°C |
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa |
| Hardness | ≤ 90 HRB |
| Standards | ASTM A335 / ASME SA335 |
Key Highlights:
- Excellent thermal and mechanical stability
- Superior creep and rupture resistance
- Ideal for superheater and reheater tubes
ASME SA335 Grade P11 Alloy Steel Pipes
Alloy Steel P11 Pipes are widely used for power generation and petrochemical processing, offering a balance of strength, flexibility, and weldability. Their chrome-moly composition enhances corrosion resistance and high-temperature endurance.
✅ Technical Specification
| Parameter | Specification |
| Composition | Chromium 1–1.5%, Molybdenum 0.44–0.65% |
| Temperature Range | Up to 600°C |
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa |
| Hardness | ≤ 85 HRB |
| Standards | ASTM A335 / ASME SA335 |
Key Highlights:
- Excellent weldability and formability
- High resistance to oxidation and scaling
- Commonly used in boilers, heat exchangers, and steam lines
ASME SA335 Grade P22 Alloy Steel Pipes
Alloy Steel P22 Pipes are known for their outstanding performance under cyclic temperature conditions, making them perfect for power plant piping systems and petrochemical applications. They offer a superior strength-to-weight ratio and long service life.
✅ Technical Specification
| Parameter | Specification |
| Composition | Chromium 1.9–2.6%, Molybdenum 0.87–1.13% |
| Temperature Range | Up to 650°C |
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa |
| Hardness | ≤ 90 HRB |
| Standards | ASTM A335 / ASME SA335 |
Key Highlights:
- Excellent performance in high-pressure applications
- Strong resistance to thermal fatigue and creep
- Ideal for refinery heaters, superheaters, and pressure vessels
ASME SA335 Grade P91 Alloy Steel Pipes
Alloy Steel P91 Pipes are among the strongest and most durable grades, engineered for extreme pressure and temperature applications. Their high chromium and molybdenum content, combined with vanadium and niobium, ensures maximum creep strength and oxidation resistance.
✅ Technical Specification
| Parameter | Specification |
| Composition | Chromium 8–9.5%, Molybdenum 0.85–1.05%, Vanadium & Niobium |
| Temperature Range | Up to 700°C |
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 440 MPa |
| Hardness | ≤ 100 HRB |
| Standards | ASTM A335 / ASME SA335 |
Key Highlights:
- Exceptional high-temperature strength and corrosion resistance
- Superior creep rupture and oxidation performance
- Preferred for turbines, high-pressure steam lines, and boilers
Why Choose Mcneil Instruments?
✔ ISO/CE-certified manufacturing ensuring global quality standards
✔ CNC-machined pipes for high dimensional accuracy
✔ Custom sizes, schedules, and pressure ratings available
✔ Heat-treated, corrosion-tested, and MTC-certified materials
✔ Global export support with secure packaging and prompt delivery
Applications Across Industries
🔹 Power Generation: Superheater and reheater piping systems
🔹 Oil & Gas: High-pressure pipelines and refinery units
🔹 Petrochemical Industry: Process heaters and catalytic reactors
🔹 Boiler Manufacturing: Tubes for heat exchangers and condensers
🔹 Energy & Steam Plants: High-temperature transfer systems
🔹 Industrial Furnaces: Oxidation-resistant piping for high heat zones
Contact Us
Looking for high-performance Alloy Steel Pipes in India?
Mcneil Instruments delivers P5, P9, P11, P22, and P91 Alloy Steel Pipes that combine strength, precision, and longevity for demanding industrial operations.
📞 Contact us today for technical assistance, tailored solutions, and competitive pricing for your next project.
FAQs
What are Alloy Steel Pipes used for?
Alloy Steel Pipes are used in high-temperature and high-pressure applications such as power plants, boilers, refineries, petrochemical plants, and industrial furnaces. Their chromium-molybdenum composition makes them ideal for environments requiring durability and heat resistance.
What is the difference between P5, P9, P11, P22, and P91 grades?
The main difference lies in their chemical composition and temperature tolerance.
P5 & P9: Suitable for moderate to high-temperature applications.
P11 & P22: Offer better flexibility, weldability, and corrosion resistance.
P91: Designed for extreme conditions, providing the highest creep and oxidation resistance.
Why are Alloy Steel Pipes preferred for high-temperature operations?
These pipes maintain mechanical strength and oxidation resistance even at temperatures above 600°C. The alloying elements—chromium and molybdenum—enhance toughness and prevent scaling, ensuring long-term performance.
Are Mcneil Instruments’ Alloy Steel Pipes certified and tested?
Yes. All pipes undergo rigorous quality checks, including hydro testing, hardness testing, and ultrasonic inspection. Each batch is delivered with Material Test Certificates (MTCs) and complies with ASTM, ASME, and DIN standards.
Can I order custom dimensions or wall thicknesses?
Absolutely. Mcneil Instruments provides customized Alloy Steel Pipes in various sizes, schedules, and pressure ratings to suit specific industrial requirements.
What industries commonly use Alloy Steel Pipes?
They are extensively used across:
Power generation plants
Oil and gas refineries
Petrochemical industries
Boiler manufacturing units
Energy and thermal plants
How does Mcneil Instruments ensure pipe durability and reliability?
Every pipe is heat-treated, corrosion-tested, and CNC-machined for precision. The company follows ISO/CE-certified processes, ensuring long service life and high dimensional accuracy.