June 24, 2025

ASTM A335 P9 Alloy Steel Pipes Manufacturer, Supplier, and Exporter in India 

Introduction

In high-temperature and high-pressure industrial environments such as power plants, oil refineries, and chemical processing units the durability and performance of piping systems are paramount. The ASTM A335 P9 Alloy Steel Pipe stands out as a specialized, high-performance solution built for these demanding conditions.

Mcneil Instrument is a trusted manufacturer, supplier, and exporter of ASTM A335 P9 Alloy Steel Pipes in India, known for its consistent quality, global supply capabilities, and commitment to meeting international standards. This blog offers a detailed guide to P9 pipes, their properties, manufacturing, applications, and why Mcneil Instrument is the ideal partner for your project needs.

Understanding P9 Alloy Steel

ASTM A335 P9 is a seamless ferritic alloy steel pipe specification designed specifically for high-temperature services. Known as a Chrome Moly pipe, it owes its enhanced performance to its chemical makeup.

Chemical Composition of P9:
  • Chromium (8.00–10.00%): Delivers exceptional resistance to oxidation, sulfidation, and hydrogen attack making the pipe suitable for elevated temperatures and harsh media. It also increases tensile strength and hardness.
  • Molybdenum (0.90–1.10%): Enhances strength at high temperatures, improves resistance to creep and wear, and prevents embrittlement.

These elements combine to create a material with:

  • Excellent high-temperature stability
  • Outstanding mechanical properties
  • Long service life in critical environments

Precision & Quality: The Manufacturing Journey of ASTM A335 P9 Pipes

At Mcneil Instrument, P9 alloy steel pipes are crafted with precision and care, ensuring reliable performance under extreme conditions.

Manufacturing Process Overview:
  • Raw Material Selection: High-grade alloy steel billets are sourced to conform to stringent industry standards.
  • Pipe Forming: Hot finishing (via piercing and rolling) or cold drawing techniques are used for dimensional accuracy.
  • Heat Treatment: Pipes undergo normalizing at a minimum of 1040°C and tempering at a minimum of 730°C to refine grain structure and enhance creep resistance.
Rigorous Quality Control Measures:
  • Chemical Analysis: Confirms the exact chemical composition.
  • Mechanical Testing: Includes tensile, flattening, hardness, and bend tests.
  • Hydrostatic Testing: Each pipe is tested for pressure integrity.
  • Non-Destructive Examination (NDE): Ultrasonic or other methods detect internal or surface defects.
  • Material Certification: Supplied with complete Material Test Certificates (MTCs) verifying ASTM A335 and other compliance.

Certifications Table of P9 Pipes

Standard / CertificationDescription
ASTM A335 / ASME SA335Conformance to international alloy standards
IBR CertifiedIndian Boiler Regulation approval
EN 10204 3.1 / 3.2Third-party inspection & traceability
NACE / HIC TestedCorrosion resistance and sour service suitability

Available Sizes & Specifications of P9 Pipes

Size RangeNB Sizes: 1/2” – 24” NB (and custom)
Outer Diameter21.3 mm – 610 mm
Wall ThicknessSCH 40, SCH 80, SCH 160, XXS
LengthSingle Random, Double Random, or Custom
TypeSeamless
End FinishPlain End / Beveled End / Threaded End

Why Mcneil Instrument is Your Ideal Partner for P9 Pipes

Mcneil Instrument brings together manufacturing excellence, global reach, and deep technical expertise to deliver reliable piping solutions.

Our Strengths:

  • Manufacturing Excellence: Equipped with modern production infrastructure aligned with ASTM, ASME, and IBR standards.
  • Extensive Inventory: Readily available P9 pipes in various sizes, thicknesses, and finishes.
  • Global Export Capabilities: Expertise in international trade, documentation, and delivery serving industries in the Middle East, Europe, Southeast Asia, and Africa.
  • Strict Quality Assurance: Each batch undergoes complete inspection and is delivered with verifiable MTCs.
  • Expert Technical Support: Our experienced team supports clients in selecting materials that match their technical and operational needs.
  • Competitive Pricing: We offer the best of Indian manufacturing high quality at globally competitive prices.

Conclusion: 

The ASTM A335 P9 Alloy Steel Pipe is indispensable in high-temperature, high-pressure environments. Ensuring material integrity and system safety starts with choosing a reliable source.

Mcneil Instrument, with its strong track record in manufacturing, supplying, and exporting P9 alloy steel pipes, is your trusted partner in delivering dependable piping systems for critical applications.Contact us today to learn more or request a quote for your upcoming projects.

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June 16, 2025

Leading ASTM A335 P5, P9, P11, P22, P91 Pipe Manufacturer, Supplier, and Exporter in India

In demanding environments like power plants, oil refineries, and petrochemical industries, ordinary pipes can fail under intense heat and pressure. This is where ASTM A335 alloy steel pipes—particularly grades P5, P9, P11, P22, and P91—come into play. These pipes are engineered to handle extreme conditions without compromising structural integrity or performance.

As a trusted manufacturer, supplier, and exporter in India, Mcneil Instrument is recognized for delivering high-grade ASTM A335 pipes that meet international standards for thermal resistance, strength, and durability. This blog will explore the significance of these grades and why Mcneil Instrument is your best choice.

What Is ASTM A335?

ASTM A335 is a specification for seamless ferritic alloy-steel pipe intended for high-temperature services. The “P” grades under this standard—P5, P9, P11, P22, and P91—are defined by different combinations of chromium, molybdenum, and other alloying elements that enhance their thermal stability and corrosion resistance.

Key Properties of ASTM A335 Pipes:
  • Excellent performance in elevated temperatures
  • Enhanced creep resistance
  • Strong oxidation and corrosion resistance
  • Suitable for boiler systems, heat exchangers, and superheaters

Grade-Wise Overview of ASTM A335 Pipes by Mcneil Instrument

GradeApplicationsAdvantages
ASTM A335 P5Oil refineries, fertilizer plantsHigh chromium content, oxidation resistance, strength under pressure
ASTM A335 P9Heat exchangers, power stationsBalanced strength and ductility, thermal stability, corrosion resistance
ASTM A335 P11Steam pipelines, industrial heatersVersatile, easy weldability, cost-effective
ASTM A335 P22Pressure vessels, nuclear plantsImproved creep strength, long service life, high-heat reliability
ASTM A335 P91Supercritical boilers, power generationExceptional tensile strength, oxidation resistance at high temperatures

Specifications and Standards – ASTM A335 P5, P9, P11, P22, P91 Pipes

GradeMain ElementsApplicationsTemp. Resistance
P55% Chromium, 0.5% MolyRefineries, High-pressure linesHigh
P99% ChromiumPower generation, Heat exchangersHigh
P111.25% Chromium, 0.5% MolyBoilers, Steam pipingMedium
P222.25% Chromium, 1% MolyNuclear, Heavy-duty pipingHigh
P919% Chromium, 1% Moly + V/NSupercritical Boilers, Energy plantsVery High

ASTM A335 P5, P9, P11, P22, P91 Pipes – Size Chart

Nominal Pipe Size (NPS)Outside Diameter (OD)Wall Thickness (SCH 40)Wall Thickness (SCH 80)Standard Lengths
1/2″21.3 mm2.77 mm3.73 mm5.8m / 6m / 12m
3/4″26.7 mm2.87 mm3.91 mm5.8m / 6m / 12m
1″33.4 mm3.38 mm4.55 mm5.8m / 6m / 12m
1 1/4″42.2 mm3.56 mm4.85 mm5.8m / 6m / 12m
1 1/2″48.3 mm3.68 mm5.08 mm5.8m / 6m / 12m
2″60.3 mm3.91 mm5.54 mm5.8m / 6m / 12m
2 1/2″73.0 mm5.16 mm7.01 mm5.8m / 6m / 12m
3″88.9 mm5.49 mm7.62 mm5.8m / 6m / 12m
4″114.3 mm6.02 mm8.56 mm5.8m / 6m / 12m
6″168.3 mm7.11 mm10.97 mm5.8m / 6m / 12m
8″219.1 mm8.18 mm12.70 mm5.8m / 6m / 12m
10″273.0 mm9.27 mm15.09 mm5.8m / 6m / 12m
12″323.8 mm9.53 mm17.48 mm5.8m / 6m / 12m
14″355.6 mm9.53 mm17.12 mm5.8m / 6m / 12m
16″406.4 mm9.53 mm18.26 mm5.8m / 6m / 12m
18″457.0 mm9.53 mm19.05 mm5.8m / 6m / 12m
20″508.0 mm9.53 mm19.05 mm5.8m / 6m / 12m
24″610.0 mm9.53 mm20.62 mm5.8m / 6m / 12m

Note:

  • Pipes are available in Seamless or Welded forms.
  • Wall thickness can vary based on Schedule (SCH 10/40/80/160/XH/XXH).
  • Custom sizes and lengths are available on request.
  • All grades—P5, P9, P11, P22, and P91—are available in the sizes listed.

Global Reach of ASTM A335 P5, P9, P11, P22, P91 Pipes by Mcneil Instrument

  • Middle East and North Africa (MENA): In MENA’s high-heat, high-pressure industrial settings, Mcneil’s ASTM A335 P-series pipes—particularly P5 and P22—are widely used in oil refineries, thermal power plants, and gas processing units. Their ability to withstand extreme temperatures and oxidative environments makes them ideal for long-term performance in desert and offshore applications.
  • North America: Our ASTM A335 P91 and P11 alloy steel pipes are commonly deployed in supercritical boilers, chemical facilities, and industrial heating systems across North America. Fully compliant with ASME and ASTM specifications, these grades are trusted for their excellent creep resistance and mechanical strength under cyclic thermal loads.
  • Europe: With stringent EN and PED standards in place, Europe relies on Mcneil’s A335 P9 and P22 pipes in nuclear power stations, pressure vessels, and heat recovery systems. Their durability and resistance to high-temperature corrosion make them essential in energy generation and advanced engineering applications.
  • Asia-Pacific: The rapid industrial growth in Asia-Pacific creates robust demand for A335 P5 and P91 pipes, especially in petrochemical complexes, power infrastructure, and steam pipelines. Mcneil Instrument delivers consistent supply and quality, supporting critical operations in high-temperature and high-pressure environments.
  • South America: From fertilizer plants to pulp and paper industries, our ASTM A335 P11 and P22 pipes are extensively used across South America. Their ability to resist thermal stress and corrosion in harsh conditions ensures long-term reliability in both industrial and energy applications.

Conclusion:

Choosing the right pipe grade is critical for system safety, efficiency, and longevity in high-temperature applications. With a proven track record, Mcneil Instrument stands as a trusted name in the manufacturing, supply, and export of ASTM A335 P5, P9, P11, P22, and P91 pipes across India and the globe.

Contact Mcneil Instrument today to get reliable, high-performance pipes tailored to your project needs.

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