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Product Overview
Introduction To Engineering Steel P11
MOKSH TUBES & FITTINGS LLP is a trusted manufacturer, supplier, exporter, importer, and stockist of P11 steel products including pipes, tubes, plates, and forgings.
EN P11, is a chromium-molybdenum alloy steel commonly used in high-temperature and high-pressure applications such as boilers, superheaters, and pressure vessels. It belongs to the Grade 1 group of alloy steels and is designed to provide excellent strength, creep resistance, and oxidation resistance at elevated temperatures up to 550°C (1022°F).
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Specifications of Alloy Steel P11 (ASTM A335 / ASME SA335)
| Category | Details |
|---|---|
| Grade | ASTM A335 P11 / ASME SA335 P11 / UNS K11597 |
| Type | Chromium-Molybdenum (Cr-Mo) Alloy Steel |
| Material Category | High-Temperature Ferritic Alloy Steel |
| Carbon Content | ~0.10% |
| Key Alloying Elements | 1.0–1.5% Cr, 0.44–0.65% Mo |
| Primary Use | High-temperature & high-pressure piping |
| Supply Conditions | Hot Finished, Cold Drawn, Normalized & Tempered |
| Available Forms | Seamless Pipes, Boiler Tubes, Heat Exchanger Tubes, Superheater Tubes |
| Heat Treatment Options | Normalizing, Tempering, Stress Relieving |
| Testing Availability | Tensile, Hydrostatic, NDT, Hardness, Chemical Analysis |
| Certification | EN 10204 3.1 / 3.2 |
| Standards | ASTM A335 / ASME SA335, DIN 1.7386 |
| Machinability | Moderate |
| Weldability | Good (Preheat recommended) |
| Corrosion Resistance | Moderate – enhanced oxidation & creep resistance |
| Temperature Resistance | Excellent – service up to ~600°C |
Chemical Composition of P11 Alloy Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.07 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Silicon (Si) | 0.10 – 0.40 |
| Chromium (Cr) | 0.90 – 1.20 |
| Molybdenum (Mo) | 0.44 – 0.65 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
Chromium and molybdenum provide P11 steel with excellent oxidation resistance, creep strength, and stability at elevated temperatures.
Physical Properties of Alloy Steel P11
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Range | 1340 – 1400 °C | 2450 – 2550 °F |
| Elastic Modulus (Tension) | 200 GPa | 29,000 ksi |
| Elastic Modulus (Torsion) | 80 GPa | 11,600 ksi |
| Poisson’s Ratio | 0.29 | — |
| Thermal Conductivity | 45 W/m·K | — |
| Specific Heat | 460 J/kg·K | — |
Heat Treatment of Alloy Steel P11
| Process | Details |
|---|---|
| Normalizing | 900–950°C, air cooled to refine grain structure |
| Tempering | 650–750°C to achieve required mechanical properties |
| Stress Relieving | 675–725°C to reduce residual stresses |
| Annealing (Subcritical) | 720–760°C, slow furnace cool for machinability |
| Hot Working | 900–1100°C |
| Cold Working | Possible; stress relieving recommended afterward |
Mechanical Properties of Alloy Steel P11 (Normalized & Tempered)
| Property | Annealed | Hot-Finished | Hot-Rolled |
|---|---|---|---|
| Tensile Strength (MPa) | 517–655 | 552–758 | 517–655 |
| Yield Strength (MPa) | 276–414 | 310–620 | 276–414 |
| Elongation (%) | 20–30 | 15–25 | 20–30 |
| Brinell Hardness (HB) | 140–190 | 160–220 | 140–190 |
| Rockwell Hardness | 75–85 B | 85–90 B | 75–85 B |
P11 maintains durability, thermal strength, and excellent resistance to creep during long high-temperature service cycles.
International Standards & Equivalent Grades of Alloy Steel P11
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | A335 P11 / SA335 P11 |
| UNS | K11597 |
| DIN / EN | 1.7386 / 13CrMo4-5 |
| JIS | SCMV4 |
| GB | 12Cr1MoV |
| ISO | ISO 9329-1 P11 |
| BS | BS 1501 Gr. 4832-11 |
Products in Engineering Steel P11
Engineering Steel P11 is typically available in:
✔
Seamless Pipes
✔
Welded Pipes (ERW & EFW)
✔
Tubes (Capillary, U-Bend)
✔
Sheets & Plates
✔
Coils & Strips
✔
Round Bars, Flat Bars, Hex Bars, Square Bars
✔
Pipe Fittings (Elbows, Tees, Reducers, Caps, Stub Ends)
✔
Flanges (Weld Neck, Slip-On, Blind, Socket Weld, Threaded)
✔
Fasteners (Bolts, Nuts, Screws, Washers, Studs)
✔
Custom Fabricated Components
Engineering Steel P11 products are produced to the following global standards:
Uses and Advantages
Excellent strength and creep resistance at elevated temperatures
Good oxidation and corrosion resistance in steam and gas environments
Suitable for high pressure and thermal cycling applications
Good weldability and machinability
Applications of Engineering Steel P11
Engineering Steel P11 is primarily used for:
Power Generation
Boiler tubes, superheater tubes, and heat exchanger tubes operating at high temperatures and pressures.
Petrochemical Industry
Pressure vessels, reactors, and piping systems handling hot gases and fluids.
Oil & Gas Industry
High-temperature pipelines and components in upstream and downstream processing.
Chemical Processing
Equipment exposed to high temperature and corrosive environments.
WHY CHOOSE US?
P11 Alloy Steel Price in India
Typical Range: ₹130 – ₹250 per kg
(Price varies by OD, wall thickness, form, and finish)
Contact us for exact quotation based on size and quantity.
FAQ's
What is P11 steel used for?
P11 steel is primarily used in high temperature and high pressure applications, including boiler tubes, superheaters, pressure vessels, and heat exchanger components in power generation, petrochemical, oil & gas, and chemical processing industries.
What are the key properties of P11 steel?
P11 steel provides excellent strength, creep resistance, oxidation resistance, good weldability, and machinability, making it suitable for thermal cycling and high-pressure environments.
In what forms is P11 steel available?
P11 steel is available in seamless and welded pipes, tubes, sheets, plates, bars, flanges, fasteners, and custom fabricated components to meet diverse industrial requirements.
Why is P11 steel suitable for high-temperature applications?
Its chromium molybdenum composition ensures superior creep resistance, oxidation resistance, and strength at elevated temperatures up to 550°C (1022°F), making it ideal for boilers, superheaters, and pressure vessels.
Why choose MOKSH TUBES & FITTINGS LLP for P11 steel?
We provide certified high-quality P11 steel products with comprehensive stock, custom sizing, technical expertise, timely deliveries, competitive pricing, and full traceability for critical alloy steel applications.
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For inquiries or quotations for P11 steel products, contact Moksh Tubes & Fittings LLP — your reliable partner for alloy steel solutions.
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