ASTM A335 Alloy Steel Pipes Manufacturer, Supplier, Stockist & Exporter in India, USA, Turkey & Nigeria
Mcneil Instrument is a trusted ASTM A335 Alloy Steel Pipes Manufacturer in India, USA, Turkey & Nigeria, offering premium-quality seamless alloy steel pipes designed for high-temperature, high-pressure, and corrosive industrial applications. As a leading supplier, stockist, exporter, and dealer of ASTM A335 Alloy Steel Pipes, we manufacture pipes that comply with ASTM, ASME, API, and international quality standards to ensure reliable performance across critical industries.
Our product range includes ASTM A335 Grade P5, P9, P11, P22, and P91 Alloy Steel Pipes, engineered for exceptional strength, creep resistance, oxidation resistance, and long service life. These seamless pipes are widely used in power plants, refineries, petrochemical facilities, boilers, heat exchangers, and pressure piping systems operating under demanding conditions.
What are ASTM A335 Alloy Steel Pipes?
ASTM A335 Alloy Steel Pipes are seamless ferritic alloy steel pipes specifically designed for elevated temperature service. Manufactured with chromium and molybdenum alloying elements, these pipes provide outstanding mechanical strength, heat resistance, oxidation resistance, and corrosion protection while maintaining structural integrity under high pressure.
Chrome Moly Alloy Steel Pipes are extensively used where conventional carbon steel pipes cannot withstand prolonged exposure to elevated temperatures and aggressive process media.
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
ASTM A335 Alloy Steel Pipe Grades We Offer
Mcneil Instrument manufactures:
- ASTM A335 Grade P5 Alloy Steel Pipes
- ASTM A335 Grade P9 Alloy Steel Pipes
- ASTM A335 Grade P11 Alloy Steel Pipes
- ASTM A335 Grade P22 Alloy Steel Pipes
- ASTM A335 Grade P91 Alloy Steel Pipes
Available in seamless construction with customized lengths, wall thicknesses, and end preparations.
ASTM A335 Grade P5 Alloy Steel Pipes
ASTM A335 P5 Alloy Steel Pipes contain chromium and molybdenum, offering excellent oxidation resistance and mechanical strength for moderate to high-temperature service. These pipes are widely used in boilers, refineries, and heat exchangers.
Features
- Excellent oxidation resistance
- Good corrosion resistance
- High-temperature strength
- Excellent weldability
- Long service life
ASTM A335 Grade P9 Alloy Steel Pipes
ASTM A335 P9 Alloy Steel Pipes provide enhanced oxidation resistance and excellent creep strength, making them suitable for thermal power stations, petrochemical plants, and pressure piping systems operating at elevated temperatures.
Benefits
- High-temperature durability
- Excellent mechanical strength
- Superior creep resistance
- Reliable pressure performance
- Excellent structural stability
ASTM A335 Grade P11 Alloy Steel Pipes
ASTM A335 P11 Alloy Steel Pipes are chromium-molybdenum seamless pipes widely used for steam pipelines, boilers, and power generation equipment requiring excellent thermal stability and long-term reliability.
ASTM A335 Grade P22 Alloy Steel Pipes
ASTM A335 P22 Alloy Steel Pipes offer improved creep resistance, oxidation resistance, and fatigue strength compared to lower alloy grades. They are commonly used in superheaters, heat exchangers, and refinery piping systems operating at elevated temperatures.
ASTM A335 Grade P91 Alloy Steel Pipes
ASTM A335 P91 Alloy Steel Pipes are premium chrome moly pipes engineered for the most demanding high-pressure and high-temperature applications. They provide exceptional creep strength, thermal stability, and oxidation resistance, making them ideal for supercritical and ultra-supercritical power plants.
Product Specifications
| Specification | Details |
| Standard | ASTM A335 / ASME SA335 |
| Grades | P5, P9, P11, P22, P91 |
| Pipe Type | Seamless Alloy Steel Pipes |
| Size Range | ½” NB to 24″ NB (Custom sizes available) |
| Schedule | SCH 20, SCH 40, SCH 80, SCH 160, XXS |
| Length | Single Random, Double Random, Cut Length |
| End Type | Plain End, Bevel End, Threaded |
| Testing | Hydro Test, PMI, UT, Radiography, Hardness Test |
| Surface Finish | Black Painted, Varnished, Oiled, Bare |
Features of Our ASTM A335 Alloy Steel Pipes
- Excellent high-temperature strength
- Superior creep resistance
- Outstanding oxidation resistance
- Excellent corrosion resistance
- High pressure capability
- Precision dimensional accuracy
- Excellent weldability
- Long operational life
- Low maintenance
- Manufactured to international standards
Applications of Alloy Steel Pipes
Our ASTM A335 Alloy Steel Pipes are extensively used in:
- Thermal Power Plants
- Nuclear Power Plants
- Oil & Gas Industries
- Petrochemical Plants
- Refineries
- Chemical Processing Industries
- Steam Pipelines
- Superheaters
- Boilers
- Heat Exchangers
- Pressure Vessels
- Fertilizer Plants
- LNG Facilities
- Offshore Platforms
- Energy Infrastructure
Why Choose Mcneil Instrument?
Mcneil Instrument is recognized as a reliable ASTM A335 Alloy Steel Pipes Manufacturer, Supplier, Stockist, and Exporter in India, delivering premium-quality seamless pipes backed by advanced manufacturing technology, stringent quality control, and worldwide exports. Every pipe undergoes rigorous inspection and testing to ensure compliance with international standards and customer specifications.
Our Advantages
- ISO-quality manufacturing
- Premium raw materials
- Large ready stock
- Competitive pricing
- Fast worldwide delivery
- Third-party inspection
- Mill Test Certificates (MTC)
- Custom sizes available
- Complete material traceability
- Technical support
Countries We Export To
Mcneil Instrument exports ASTM A335 Alloy Steel Pipes to:
- United States
- Canada
- Mexico
- Brazil
- United Kingdom
- Germany
- France
- Italy
- Spain
- Netherlands
- UAE
- Saudi Arabia
- Qatar
- Kuwait
- Oman
- Bahrain
- South Africa
- Nigeria
- Kenya
- Singapore
- Malaysia
- Indonesia
- Thailand
- Australia
- New Zealand
High-Performance Piping Solutions for Critical Service Environments
Alloy Steel Pipes are extensively engineered for the conveyance of fluids intended for critical high-temperature and severe general corrosion service applications. Formulated with key alloying elements such as Chromium, Molybdenum, and Vanadium, these pipes deliver superior mechanical strength and creep resistance under extreme operational pressure where standard carbon steel fails.
Similarly, Alloy Steel Tubes are manufactured for high-stress heat transfer process equipment. They perform reliably across critical thermal exchange systems including Boilers, Superheaters, Heat Exchangers, Condensers, General Engineering, and Process Instrumentation.
Comprehensive Grade Comparison – ASTM A335 / ASME SA335 Pipes
| Grade | ASTM Standard | ASME Standard | Carbon Grade | Chrome Moly | Molybdenum Grade |
| P5 | ASTM A335 P5 | ASME SA335 P5 | ✔️ P5 | ✔️ P5 | ✔️ P5 |
| P9 | ASTM A335 P9 | ASME SA335 P9 | ✔️ P9 | ✔️ P9 | ✔️ P9 |
| P11 | ASTM A335 P11 | ASME SA335 P11 | ✔️ P11 | ✔️ P11 | ✔️ P11 |
| P22 | ASTM A335 P22 | ASME SA335 P22 | ✔️ P22 | ✔️ P22 | ✔️ P22 |
| P91 | ASTM A335 P91 | ASME SA335 P91 | ✔️ P91 | ✔️ P91 | ✔️ P91 |
Technical Specifications:
Each ASTM A335 grade—P5, P9, P11, P22, and P91—is manufactured to meet global standards. We are a leading supplier and exporter of chrome moly seamless pipes in these grades.
Chemical Composition (%):
| Grade | C | Mn | P (max) | S (max) | Si | Cr | Mo |
| P5 | 0.15 max | 0.30–0.60 | 0.025 | 0.025 | 0.50 max | 4.00–6.00 | 0.45–0.65 |
| P9 | 0.15 max | 0.30–0.60 | 0.025 | 0.025 | 0.25–1.00 | 8.00–10.00 | 0.90–1.10 |
| P11 | 0.05–0.15 | 0.30–0.60 | 0.025 | 0.025 | 0.50 max | 1.00–1.50 | 0.44–0.65 |
| P22 | 0.05–0.15 | 0.30–0.60 | 0.025 | 0.025 | 0.50 max | 1.90–2.60 | 0.87–1.13 |
| P91 | 0.08–0.12 | 0.30–0.60 | 0.020 | 0.010 | 0.20–0.50 | 8.00–9.50 | 0.85–1.05 |
Mechanical Properties:
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Impact Energy (J) | Hardness (HB) |
| P5 | ≥ 415 | ≥ 205 | ≥ 22 | ≥ 35 | ≤ 187 |
| P9 | ≥ 585 | ≥ 275 | ≥ 30 | ≥ 35 | ≤ 250 |
| P11 | ≥ 415 | ≥ 205 | ≥ 22 | ≥ 35 | ≤ 163 |
| P22 | ≥ 415 | ≥ 205 | ≥ 22 | ≥ 35 | ≤ 163 |
| P91 | 585–760 | 415–585 | ≥ 20 | ≥ 35 | ≤ 250 |
Heat Treatment Requirements
| Grade | Treatment Type | Normalizing Temp (°F) | Tempering Temp (°F) |
| P5 | Normalize & Temper / Full Anneal | – | 1250 [675] |
| P5c | Subcritical Anneal | – | 1325–1375 [715–745] |
| P9 | Normalize & Temper / Full Anneal | – | 1250 [675] |
| P11 | Normalize & Temper / Full Anneal | – | 1200 [650] |
| P22 | Normalize & Temper / Full Anneal | – | 1250 [675] |
| P91 | Normalize & Temper / Quench and Temper | 1900–1975 [1040–1080] | 1350–1470 [730–800] |
Comparative Chemical Composition of ASTM A335 Alloy Steel Pipe Grades (P5, P9, P11, P22)
| Element | P5 (%) | P9 (%) | P11 (%) | P22 (%) |
| C | 0.05–0.15 | 0.05–0.15 | 0.05–0.15 | 0.05–0.15 |
| Cr | 4.00–6.00 | 8.00–10.00 | 1.00–1.50 | 1.90–2.60 |
| Mn | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 |
| Mo | 0.45–0.65 | 0.90–1.10 | 0.44–0.65 | 0.87–1.13 |
| P | 0.025 max | 0.025 max | 0.025 max | 0.025 max |
| S | 0.025 max | 0.025 max | 0.025 max | 0.025 max |
| Si | 0.50–1.00 | 0.25–1.00 | 0.50 max | 0.50 max |
ASTM A335 Alloy Steel Pipes – Grade-Wise Product Range
We manufacture and supply ASTM A335 Alloy Steel Pipes in multiple grade variants suitable for high-pressure, high-temperature applications.
Available Grades:
- ASTM A335 Grade P5 Alloy Steel Pipe
- ASTM A335 Grade P9 Alloy Steel Pipe
- ASTM A335 Grade P11 Alloy Steel Pipe
- ASTM A335 Grade P22 Alloy Steel Pipe
- ASTM A335 Grade P91 Alloy Steel Pipe
Also available in:
| Chrome Moly Pipes | Carbon Grade Pipes | Molybdenum Grade Pipes |
| ASTM A335 P5 Chrome Moly Pipe | ASTM A335 Carbon Grade P5 Pipe | ASTM A335 Molybdenum Grade P5 Pipe |
| ASTM A335 P9 Chrome Moly Pipe | ASTM A335 Carbon Grade P9 Pipe | ASTM A335 Molybdenum Grade P9 Pipe |
| ASTM A335 P11 Chrome Moly Pipe | ASTM A335 Carbon Grade P11 Pipe | ASTM A335 Molybdenum Grade P11 Pipe |
| ASTM A335 P22 Chrome Moly Pipe | ASTM A335 Carbon Grade P22 Pipe | ASTM A335 Molybdenum Grade P22 Pipe |
| ASTM A335 P91 Chrome Moly Pipe | ASTM A335 Carbon Grade P91 Pipe | ASTM A335 Molybdenum Grade P91 Pipe |
ASME SA335 Alloy Steel Pipes – Grade-Wise Product Range
Our ASME SA335 Alloy Steel Pipes deliver consistent performance across industrial applications, from power plants to petrochemical systems.
Available Grades:
- ASME SA335 Grade P5 Alloy Steel Pipe
- ASME SA335 Grade P9 Alloy Steel Pipe
- ASME SA335 Grade P11 Alloy Steel Pipe
- ASME SA335 Grade P22 Alloy Steel Pipe
- ASME SA335 Grade P91 Alloy Steel Pipe
Also available in:
| Chrome Moly Pipes | Carbon Grade Pipes | Molybdenum Grade Pipes |
| ASME SA335 P5 Chrome Moly Pipe | ASME SA335 Carbon Grade P5 Pipe | ASME SA335 Molybdenum Grade P5 Pipe |
| ASME SA335 P9 Chrome Moly Pipe | ASME SA335 Carbon Grade P9 Pipe | ASME SA335 Molybdenum Grade P9 Pipe |
| ASME SA335 P11 Chrome Moly Pipe | ASME SA335 Carbon Grade P11 Pipe | ASME SA335 Molybdenum Grade P11 Pipe |
| ASME SA335 P22 Chrome Moly Pipe | ASME SA335 Carbon Grade P22 Pipe | ASME SA335 Molybdenum Grade P22 Pipe |
| ASME SA335 P91 Chrome Moly Pipe | ASME SA335 Carbon Grade P91 Pipe | ASME SA335 Molybdenum Grade P91 Pipe |
Why ASTM A335 Alloy Steel Pipes Are Preferred for Critical Applications
ASTM A335 Alloy Steel Pipes are engineered specifically for elevated temperature service. The addition of chromium and molybdenum improves oxidation resistance, creep strength, corrosion resistance, and mechanical performance under extreme operating conditions.
Key Benefits
- Excellent High-Temperature Strength
- Superior Creep Resistance
- Outstanding Oxidation Resistance
- High Pressure Handling Capability
- Excellent Thermal Stability
- Long Service Life
- Superior Weldability
- Reduced Maintenance Costs
These properties make ASTM A335 Grade P5, P9, P11, P22, and P91 Pipes ideal for critical industrial operations.
ASTM A335 Pipe Grades We Manufacture
ASTM A335 P5 Alloy Steel Pipes
ASTM A335 P5 Pipes contain approximately 5% chromium and 0.5% molybdenum, providing excellent oxidation resistance and thermal stability. These pipes are widely used in refinery units, heat exchangers, and high-temperature process systems.
Features
- Excellent Heat Resistance
- Good Corrosion Resistance
- Reliable Mechanical Properties
- Suitable for Elevated Temperature Service
ASTM A335 P9 Alloy Steel Pipes
P9 Alloy Steel Pipes contain higher chromium and molybdenum content, offering superior creep resistance and enhanced mechanical strength under extreme operating conditions.
Features
- High Strength
- Improved Thermal Stability
- Excellent Pressure Resistance
- Suitable for Power Plants and Boilers
ASTM A335 P11 Alloy Steel Pipes
P11 Pipes are among the most commonly used alloy steel grades in power generation and process industries due to their excellent balance of strength, weldability, and cost-effectiveness.
Features
- Good Tensile Strength
- Excellent Weldability
- High Temperature Capability
- Long-Term Reliability
ASTM A335 P22 Alloy Steel Pipes
P22 Pipes are widely used for steam lines, pressure vessels, and refinery systems where resistance to thermal fatigue and creep deformation is required.
Features
- Excellent Thermal Stability
- Superior Creep Strength
- Reliable High-Pressure Performance
- Extended Service Life
ASTM A335 P91 Alloy Steel Pipes
P91 Alloy Steel Pipes are designed for ultra-high temperature and high-pressure environments. Their enhanced chromium, molybdenum, and vanadium composition provides exceptional mechanical properties.
Features
- Outstanding Creep Resistance
- High Temperature Strength
- Excellent Oxidation Resistance
- Superior Fatigue Performance
Alloy Steel Pipe Categories Available
Mcneil Instruments supplies ASTM A335 and ASME SA335 pipes in various material categories to suit specific industrial requirements.
Chrome Moly Alloy Steel Pipes
Manufactured with chromium and molybdenum to improve heat resistance, oxidation resistance, and mechanical strength.
Available Grades:
- ASTM A335 P5 Chrome Moly Pipe
- ASTM A335 P9 Chrome Moly Pipe
- ASTM A335 P11 Chrome Moly Pipe
- ASTM A335 P22 Chrome Moly Pipe
- ASTM A335 P91 Chrome Moly Pipe
Molybdenum Alloy Steel Pipes
Engineered for enhanced strength and durability in elevated temperature environments.
Available Grades:
- ASTM A335 P5 Moly Pipe
- ASTM A335 P9 Moly Pipe
- ASTM A335 P11 Moly Pipe
- ASTM A335 P22 Moly Pipe
- ASTM A335 P91 Moly Pipe
High Temperature Alloy Steel Pipes
Designed specifically for boilers, superheaters, heat exchangers, and steam pipelines operating under severe service conditions.
ASTM A335 Alloy Steel Pipe Specifications
| Specification | Details |
| Standard | ASTM A335 / ASME SA335 |
| Grades | P5, P9, P11, P22, P91 |
| Pipe Type | Seamless |
| Size Range | 1/8″ NB to 36″ NB |
| Wall Thickness | SCH 10 to SCH XXS |
| Length | Single Random, Double Random, Cut Length |
| End Type | Plain End, Beveled End, Threaded |
| Test Certificates | EN 10204 3.1 / 3.2 |
| Manufacturing Method | Hot Finished / Cold Drawn |
Industries Using ASTM A335 Alloy Steel Pipes
Power Generation Plants
Used in boilers, superheaters, reheaters, and steam piping systems.
Petrochemical Industry
Suitable for high-temperature process lines and chemical handling systems.
Oil & Gas Industry
Widely used in refineries, processing facilities, and offshore installations.
Fertilizer Plants
Provides reliable performance under demanding operating conditions.
Chemical Processing Industry
Used for high-pressure fluid transportation and process systems.
EPC Projects
Specified for large-scale industrial infrastructure and engineering developments.
Applications of ASTM A335 P-Series Pipes
- High Pressure Boilers
- Steam Pipelines
- Superheaters
- Reheaters
- Heat Exchangers
- Pressure Vessels
- Refinery Process Systems
- Petrochemical Facilities
- Thermal Power Plants
- Fertilizer Plants
- Offshore Platforms
- Industrial Utility Systems
Quality Assurance & Testing
Every ASTM A335 Alloy Steel Pipe undergoes comprehensive inspection and testing procedures to ensure compliance with international standards.
Tests Performed
- PMI Testing
- Hydrostatic Testing
- Mechanical Testing
- Chemical Analysis
- Hardness Testing
- Ultrasonic Testing
- Dimensional Inspection
- Visual Inspection
- Third-Party Inspection
- Material Verification
All products are supplied with complete traceability and material test certificates.
Why Choose Mcneil Instruments?
Extensive Grade Availability
Complete stock of ASTM A335 P5, P9, P11, P22, and P91 Pipes.
Ready Inventory
Large stock availability for immediate project requirements.
International Quality Standards
Manufactured according to ASTM, ASME, ANSI, and global specifications.
Competitive Pricing
Cost-effective solutions for both small and bulk orders.
Customized Cutting Services
Project-specific lengths and dimensions available.
Complete Documentation
MTC, Inspection Reports, and Traceability Records supplied.
Third-Party Inspection
Independent inspection available upon customer request.
Fast Delivery Support
Efficient logistics and prompt order execution.
Frequently Searched ASTM A335 Alloy Steel Pipe Products
- ASTM A335 P5 Alloy Steel Pipe
- ASTM A335 P9 Alloy Steel Pipe
- ASTM A335 P11 Alloy Steel Pipe
- ASTM A335 P22 Alloy Steel Pipe
- ASTM A335 P91 Alloy Steel Pipe
- ASME SA335 P5 Pipe
- ASME SA335 P11 Pipe
- ASME SA335 P22 Pipe
- ASME SA335 P91 Pipe
- Chrome Moly Pipe Manufacturer
- High Temperature Alloy Steel Pipe
- Seamless Alloy Steel Pipe Supplier
- Boiler Pipe Manufacturer
- Alloy Steel Pipe Distributor in India
Contact Mcneil Instruments
Looking for a reliable ASTM A335 P5, P9, P11, P22, or P91 Alloy Steel Pipe Manufacturer, Supplier & Distributor? Contact Mcneil Instruments for competitive pricing, technical support, ready stock availability, and customized piping solutions for your industrial projects.
FAQs
Who is the top manufacturer and supplier of ASTM A335 P-grade alloy steel pipes?
Mcneil Instruments is a trusted manufacturer, supplier, and exporter of ASTM A335 P5, P9, P11, P22, and P91 pipes, known for quality and global delivery.
What industries use ASTM A335 P-grade pipes?
Power generation, petrochemicals, oil & gas, and boiler manufacturing.
What are the differences between P5 and P91 Alloy Steel Pipes?
P5 and P91 Alloy Steel Pipes differ mainly in their chemical composition, mechanical properties, and temperature resistance.
- P5 pipes contain chromium (4-6%) and molybdenum (0.45-0.65%), suitable for moderate high-temperature service.
- P91 pipes have enhanced levels of chromium (8-9%) and added vanadium and niobium, making them ideal for extreme temperature and pressure applications. P91 also offers higher creep strength and longer service life in power generation and petrochemical environments.
Are ASME SA335 and ASTM A335 standards interchangeable?
ASME SA335 and ASTM A335 standards are often considered equivalent in material specifications, but they serve different regulatory purposes.
- ASTM A335 is a standard specification for seamless ferritic alloy-steel pipe for high-temperature service.
- ASME SA335 is the pressure vessel code version of the same specification, approved for use in ASME-certified boilers and pressure vessels. While they share the same grades and chemistry, SA335 is used in code-stamped applications that require ASME compliance.
Do you offer third-party inspection and testing certificates?
Absolutely. We provide test reports and third-party inspection approvals.
Are these pipes suitable for high-pressure and high-temperature conditions?
Yes. Their chrome-moly composition makes them ideal for elevated conditions.
Can Mcneil Instruments export to the Middle East and Europe?
Yes, we export globally with a presence in over 30+ countries.