Molybdenum Steel Pipes Grades P5/P9/P11/P22/P91 Manufacturer, Supplier & Exporter in India – Mcneil Instruments
Mcneil Instruments is a trusted manufacturer, supplier, and exporter of Molybdenum Steel Pipes in India, providing reliable piping solutions engineered to perform under extreme temperature and pressure. Our range includes ASTM A335 / ASME SA335 Molybdenum Grade P5, P9, P11, P22, and P91 Pipes, designed for use in power plants, refineries, boilers, and petrochemical industries.
Each pipe is manufactured with high Molybdenum and Chromium content, ensuring outstanding oxidation resistance, creep strength, and dimensional stability, even in continuous thermal exposure.
Grades We Offer
We are recognized as a leading manufacturer and supplier of P5, P9, P11, P22, and P91 grade molybdenum steel pipes designed to perform in demanding environments.
P5 Pipes
P9 Pipes
P11 Pipes
P22 Pipes
P91 Pipes
ASME SA335 Grade P5 Molybdenum Steel Pipes
P5 Molybdenum Pipes are developed for high-temperature service, offering superior resistance to corrosion and oxidation. These pipes are ideal for refineries, superheaters, and chemical processing plants.
✅ 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 creep strength at elevated temperatures
- Ideal for boilers, pressure vessels, and refineries
ASME SA335 Grade P9 Molybdenum Steel Pipes
P9 Molybdenum Pipes deliver strong mechanical performance and thermal stability, making them suitable for superheaters, furnaces, and refinery piping systems.
✅ 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:
- High resistance to thermal fatigue and oxidation
- Retains strength during prolonged high-temperature service
- Used in refineries, chemical plants, and high-pressure systems
ASME SA335 Grade P11 Molybdenum Steel Pipes
P11 Molybdenum Pipes offer a combination of toughness, ductility, and weldability, making them ideal for steam lines, boilers, and power generation systems.
✅ 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 thermal and mechanical strength
- High oxidation and creep resistance
- Suitable for pressure vessels and steam pipelines
ASME SA335 Grade P22 Molybdenum Steel Pipes
P22 Molybdenum Pipes are known for their strength, flexibility, and long-term creep resistance. These are widely used in boilers, heat exchangers, and energy sectors for high-pressure and high-temperature operations.
✅ 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 fatigue and creep strength
- Long-lasting under fluctuating temperature conditions
- Commonly used in boilers, refineries, and industrial heaters
ASME SA335 Grade P91 Molybdenum Steel Pipes
P91 Molybdenum Pipes represent the highest strength grade, offering unmatched oxidation resistance, toughness, and high-pressure endurance. The alloy includes Chromium, Molybdenum, Vanadium, and Niobium for extreme performance.
✅ 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:
- Outstanding strength and oxidation resistance
- Superior creep rupture strength
- Best suited for turbines, boilers, and ultra-high-pressure systems
Why Choose Mcneil Instruments?
✔ Globally trusted ISO/CE-certified manufacturing facility
✔ Precision CNC-machined components for perfect fit and sealing
✔ Available in custom diameters, pressure ratings, and wall thickness
✔ 100% traceable materials with MTC certification
✔ Robust export packaging with guaranteed on-time delivery
Applications Across Industries
🔹 Power Generation: Steam lines, turbines, and heaters
🔹 Oil & Gas: Refineries and high-pressure transfer lines
🔹 Petrochemical Plants: Process reactors and heat exchangers
🔹 Boiler Systems: Superheaters and reheaters
🔹 Thermal Plants: Steam generation and distribution systems
🔹 Industrial Furnaces: High heat and oxidation-resistant operations
Contact Us
Looking for premium Molybdenum Steel Pipes in India?
Mcneil Instruments delivers P5, P9, P11, P22, and P91 Molybdenum Pipes built for superior strength, durability, and high-temperature performance.
📞 Get in touch today for expert consultation, tailored manufacturing options, and competitive pricing to meet your project needs.
FAQs
What are Molybdenum Steel Pipes used for?
Molybdenum Steel Pipes are used in high-temperature and high-pressure applications, such as boilers, heat exchangers, refineries, and power generation systems. Their alloy composition ensures excellent performance where heat and corrosion resistance are critical.
What makes Molybdenum Steel Pipes different from regular Alloy Steel Pipes?
The higher molybdenum content gives these pipes superior creep strength, oxidation resistance, and long-term durability at elevated temperatures, making them ideal for demanding thermal and mechanical environments.
What are the main differences between P5, P9, P11, P22, and P91 grades?
Each grade varies in chromium, molybdenum, and alloying elements, which define its temperature range and strength:
P5 & P9 – Moderate to high-temperature resistance.
P11 & P22 – Enhanced flexibility and weldability.
P91 – Maximum creep and rupture strength for extreme conditions.
Are Mcneil Instruments’ Molybdenum Steel Pipes tested and certified?
Yes. Every pipe is hydro-tested, hardness-tested, and dimensionally inspected, with Material Test Certificates (MTC) provided. Mcneil Instruments follows ASTM A335 / ASME SA335 standards and ISO/CE certifications.
Can I order custom sizes or pressure ratings?
Yes, Mcneil Instruments offers custom fabrication for pipe diameters, wall thicknesses, and schedules, ensuring compatibility with your project’s pressure and temperature specifications.
How do Molybdenum Steel Pipes perform in high-temperature conditions?
These pipes maintain mechanical integrity and corrosion resistance up to 700°C, making them perfect for continuous operation in thermal and industrial systems.
Do you export Molybdenum Steel Pipes internationally?
Yes. Mcneil Instruments exports globally with secure, corrosion-protected packaging, complete documentation, and on-time delivery to international clients.