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ASME SA335 Alloy Steel Pipes Exporter In United Arab Emirates - Mcneil Alloys

Mcneil Alloys supplies ASME SA335 alloy steel pipes in the UAE for projects where operating conditions place heavy demands on piping materials. Our focus is on providing pipes that are built for long service life in high-temperature and high-pressure environments, where material failure is not an option. The SA335 grades we handle are commonly used in critical systems that require consistency, strength, and dependable performance over time.

The ASME SA335 alloy steel pipes we supply are manufactured from carefully controlled chromium-molybdenum steel grades such as P5, P9, P11, P22, and P91. These materials offer the combination of heat resistance, mechanical strength, and stability required for power plants, refineries, petrochemical units, and industrial process systems. Our pipes are selected and supplied to remain structurally sound under continuous thermal stress, pressure, and demanding operating conditions.

Our ASME SA335 Alloy Steel Pipes

ASME P5 Alloy Steel Pipes

P5 alloy steel pipes are used in high-temperature services where resistance to oxidation and thermal stability are important. They are commonly applied in heat exchangers, boilers, and refinery piping systems operating under steady heat conditions.

ASME P9 Alloy Steel Pipes

P9 alloy steel pipes are suitable for elevated temperature applications that require improved resistance to oxidation and surface scaling. These pipes are widely used in refinery process lines and power plant systems exposed to continuous heat.

ASME P11 Alloy Steel Pipes

P11 alloy steel pipes are designed for high-pressure and high-temperature environments, particularly in steam and boiler applications. They are commonly used in superheaters, steam lines, and power generation systems requiring long-term strength.

ASME P22 Alloy Steel Pipes

P22 alloy steel pipes are preferred for severe service conditions involving high temperature, pressure, and thermal cycling. They are extensively used in main steam lines, reheaters, and critical piping systems in power plants and refineries.

ASME P91 Alloy Steel Pipes

P91 alloy steel pipes are developed for extreme temperature and pressure applications where high creep resistance is essential. These pipes are widely used in supercritical power plants and advanced industrial systems demanding long service life.

ASME SA335 Grade P5 Alloy Steel Pipes

Grade P5 alloy steel pipes are typically selected for systems operating at elevated temperatures where material stability over time is essential. This grade offers dependable resistance to oxidation and surface degradation, making it suitable for applications that remain under steady thermal conditions without extreme pressure demands.

Highlights:

  • Designed for elevated temperature service

  • Good resistance to oxidation and scaling

  • Stable performance under continuous heat

  • Commonly used in heat exchangers and refinery piping

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

ASME SA335 Grade P9 Alloy Steel Pipes

ASME SA335 Grade P9 pipes are used where higher operating temperatures require improved material protection against oxidation. With increased chromium content compared to P5, this grade performs well in hot process lines and industrial systems that operate continuously at elevated temperatures.

Highlights:

  • Higher chromium content for better heat resistance

  • Suitable for continuous high-temperature operation

  • Widely applied in refinery and power plant systems

  • Maintains mechanical strength over extended service

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

ASME SA335 Grade P11 Alloy Steel Pipes

Grade P11 alloy steel pipes are commonly specified for applications involving both high pressure and high temperature. This grade is frequently used in steam lines, boilers, and superheaters, where long-term strength and resistance to thermal stress are important for safe operation.

Highlights:

  • Designed for high-pressure steam services

  • Used in boilers and power generation systems

  • Reliable for long-duration operating cycles

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

ASME SA335 Grade P22 Alloy Steel Pipes

ASME SA335 Grade P22 pipes are intended for more severe service conditions where thermal cycling and mechanical stress are significant. This grade is widely used in main steam lines and reheater systems, providing enhanced resistance to deformation and long-term strength at high temperatures.

Highlights:

  • High creep strength for severe operating conditions

  • Good resistance to thermal fatigue

  • Used in main steam and reheater lines

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

ASME SA335 Grade P91 Alloy Steel Pipes

Grade P91 alloy steel pipes are engineered for extreme temperature and pressure environments. Known for their superior creep resistance and high strength, these pipes are commonly used in supercritical power plants and advanced industrial systems where efficiency and long service life are required.

Highlights:

  • Excellent creep resistance at very high temperatures

  • Designed for extreme pressure applications

  • Used in supercritical and ultra-supercritical systems

  • Supports long-term structural stability

Technical Specification
Parameter Specification
Composition Chromium 8–9.5%, Molybdenum 0.85–1.05%, with Vanadium and Niobium
Temperature Range Up to 700°C
Tensile Strength ≥ 620 MPa
Yield Strength ≥ 440 MPa
Hardness ≤ 100 HRB
Standards ASTM A335 / ASME SA335

Applications of ASME SA335 Alloy Steel Pipes

When you use ASME SA335 alloy steel pipes, it’s usually because the operating conditions leave no room for compromise. We see these grades used where temperature, pressure, and long service life all come together.

  • Boiler, superheater, and steam lines in power plants where pipes stay under heat for years

  • Refinery process lines handling hot hydrocarbons and continuous flow

  • Main steam and reheater systems exposed to thermal cycling

  • Petrochemical units and heavy process industries with strict material requirements

  • Replacement piping during shutdowns where reliability matters more than cost

Why Choose Mcneil Alloys for ASME SA335 Alloy Steel Pipes

  • We help you confirm the right SA335 grade based on how your system actually operates

  • You receive pipes with proper heat treatment and inspection-ready documentation

  • We understand how SA335 materials are reviewed and approved on project sites

  • You deal directly with a team that handles these grades regularly, not occasionally

  • We coordinate supply from the UAE for both local and export projects

  • You avoid delays caused by missing documents or incorrect material conditions

  • We keep communication clear from enquiry through delivery

Let’s Talk About Your SA335 Pipe Requirement

Get in touch  If you’re planning to use ASME SA335 Grade P5, P9, P11, P22, or P91 alloy steel pipes, share your operating conditions with us. We’ll help you confirm the right grade and supply approach so you can move ahead without unnecessary delays.

Talk to Mcneil Alloys today and let’s get it right from the start.  

Frequently Asked Questions – ASME SA335 Alloy Steel Pipes

What is ASME SA335 alloy steel pipe used for? +
ASME SA335 alloy steel pipes are used in high-temperature and high-pressure piping systems. They are commonly found in boilers, steam lines, refineries, power plants, and process industries where standard carbon steel cannot withstand long-term heat or pressure.
How do I choose between P5, P9, P11, P22, and P91 grades? +
Grade selection depends on operating temperature, pressure, and expected service life. Lower grades such as P5 and P9 are typically used for moderate high-temperature service, while P11, P22, and P91 are selected for higher pressure and more demanding operating conditions.
Are ASME SA335 pipes suitable for continuous high-temperature service? +
Yes. ASME SA335 pipes are designed for continuous operation at elevated temperatures. Grades such as P11, P22, and P91 are widely used in systems that operate under sustained heat and pressure for long periods without frequent shutdowns.
What documents will I receive with SA335 alloy steel pipes? +
Pipes are supplied with material test certificates including chemical and mechanical test results. Where required, additional testing such as PMI, NDT, and supplementary inspection reports can be arranged based on project or client specifications.
Do you supply ASME SA335 pipes in the UAE and for export projects? +
Yes. We supply ASME SA335 alloy steel pipes across the UAE and also support export projects. Packing, marking, and documentation are handled to meet site requirements as well as international shipping and inspection standards.