Incoloy 800 vs 825 are two widely used nickel-iron-chromium alloys that are known for their excellent corrosion resistance, mechanical strength, and suitability for high-temperature environments. While these alloys share many characteristics, they also have distinct differences that make them ideal for specific applications.
Are you choosing between Incoloy 800 and Incoloy 825 for your high-temperature, chemical processing, or corrosive environment project? This comparison guide helps you understand the differences in composition, performance, and cost — and offers guidance to pick the right alloy and request a fast quote from Huaxiao Metal.
What Is Incoloy Alloy 825(UNS N08825 / W.Nr. 2.4858)?
Incoloy 825 is a nickel-iron-chromium alloy with added elements such as molybdenum (Mo), copper (Cu), and titanium (Ti), enhancing its corrosion resistance in reducing acids, seawater, and chloride environments.
Its core advantages include:
- In sulfuric acid, phosphoric acid, and chloride environments, its resistance to pitting, crevice corrosion, and stress corrosion cracking is significantly superior to Incoloy 800.
- It also offers slightly higher mechanical strength: typical tensile strength ≥ 550 MPa and yield strength ≥ 220 MPa.
- It is commonly used in harsh environments such as chemical plants, offshore platforms, and pollution treatment equipment.
As an export manufacturer, Huaxiao Metal offers customized Incoloy 825 alloy and provides technical data. Contact customer service today for the latest quote and delivery times for Incoloy 825 alloy.
What Is Incoloy Alloy 800 (UNS N08800 / W.Nr. 1.4876)?
Incoloy 800 is a nickel-iron-chromium alloy with a typical chemical composition of 30-35% Ni, 19-23% Cr, and the remainder Fe. It is designed to maintain strength and stability in high-temperature oxidation, carburization, and nitriding environments.
Its key features include:
- High-temperature resistance to oxidation, nitridation, and carburization makes it ideal for use in tube bundles and components in heat exchangers, industrial furnaces, and petrochemical cracking units.
- It maintains good strength at temperatures exceeding 1000°C.
- Its excellent weldability and workability make it suitable for the manufacture of a variety of structural parts.
Directly supplied by Huaxiao Metal, we maintain an extensive inventory and support global export. Request a quote for Incoloy 800 alloy now to learn about minimum order quantities and inventory availability.
Incoloy 800 vs 825 Alloy – What’s the Difference?
Choosing between Incoloy 800 and Inconel Alloy 825 depends on several factors, including chemical composition, mechanical properties, and cost. Below, we break down the main differences:
Chemical Composition: Incoloy 800 vs 825 Alloy
| Element | Incoloy 800 | Incoloy 825 |
|---|---|---|
| Ni | 30–35% | 38–46% |
| Cr | 19–23% | 19.5–23.5% |
| Fe | Balance | Balance |
| Mo | – | 2.5–3.5% |
| Cu | – | 1.5–3% |
| Ti | ≤ 0.6% | 0.6–1.2% |
| C | ≤ 0.10% | ≤ 0.05% |
| Si | ≤ 1.0% | ≤ 0.5% |
| Mn | ≤ 1.5% | ≤ 1.0% |
The key difference lies in the higher nickel, molybdenum, and copper content of Incoloy 825, which dramatically improves its corrosion resistance in strong acid and seawater environments.
For detailed composition certificates, request Huaxiao Metal’s MTC sample.
Mechanical Behavior: Incoloy 800 vs 825 Alloy
Incoloy 825 has a slightly higher strength due to solid-solution strengthening from Mo and Cu. In contrast, Incoloy 800 focuses on maintaining strength at extreme temperatures, making it more stable under cyclic heating.
Huaxiao Metal can supply tensile and hardness test reports for both materials upon request.
| Property | Incoloy 800 | Incoloy 825 |
|---|---|---|
| Tensile Strength | ≥ 450 MPa | ≥ 550 MPa |
| Yield Strength | ≥ 170 MPa | ≥ 220 MPa |
| Elongation | ≥ 30% | ≥ 30% |
| Hardness (Rockwell) | B85–B90 | B88–B93 |
Equivalent Grades: Incoloy 800 vs 825 Alloy
| Standard | Incoloy 800 | Incoloy 825 |
|---|---|---|
| UNS | N08800 | N08825 |
| DIN | 1.4876 | 2.4858 |
| ASTM | B407 / B408 | B423 / B424 |
| JIS | NCF 800 | NCF 825 |
| EN | NiCr20TiAl | NiCr21Mo |
Huaxiao Metal offers full cross-standard documentation for international projects.
Ask our team for ASTM–EN–JIS equivalence sheets.
Physical Properties: Incoloy 800 vs 825 Alloy
| Property | Incoloy 800 | Incoloy 825 |
|---|---|---|
| Density | 7.94 g/cm³ | 7.94 g/cm³ |
| Melting Range | 1357–1385°C | 1370–1400°C |
| Thermal Conductivity | 11.2 W/m·K (at 100°C) | 11.1 W/m·K (at 100°C) |
| Specific Heat Capacity | ~502 J/kg·K | ~460 J/kg·K |
| Electrical Resistivity | 0.98 μΩ·m | 1.03 μΩ·m |
Application
- Incoloy 800: Ideal for high-temperature industrial applications such as heat exchangers and furnace components.
- Incoloy 825: Preferred for chemical processing, pollution control, and environments where acid resistance is critical.
Heat Resistance
Incoloy 800 is specifically engineered for high-temperature applications, withstanding temperatures up to 1100°C. Incoloy 825 can handle elevated temperatures but is better known for its corrosion resistance.
Corrosion Resistance
Incoloy 825 outperforms Incoloy 800 in environments with reducing agents, such as sulfuric acid and phosphoric acid, due to its molybdenum and copper content.
High-Temperature Strength
Incoloy 800 maintains structural stability up to 1100°C, making it ideal for heat treatment furnaces and superheater tubes.
Incoloy 825 can withstand up to 1000°C, but its design emphasis is chemical corrosion, not sustained high temperature.
Cost
Incoloy 825 is generally more expensive due to its enhanced corrosion resistance and additional alloying elements. Incoloy 800 is more cost-effective for high-temperature but less corrosive conditions.
Main Standards
- Incoloy 800: ASTM B409, ASTM B407
- Incoloy 825: ASTM B424, ASTM B425
Fabrication and Weldability
Both alloys are highly fabricable and weldable, but care must be taken with Incoloy 825 to avoid contamination during welding, as its corrosion resistance depends on maintaining alloy purity.
Application Industries and Case Studies
6.1 Incoloy 800 Applications
Petrochemical heaters and reformer tubing.
Industrial furnaces, burners, and heat exchangers.
Power generation steam superheaters.
Boiler components and pressure vessels.
6.2 Incoloy 825 Applications
Sulfuric and phosphoric acid production units.
Seawater desalination and cooling systems.
Marine pollution control and offshore oil platforms.
Chemical tanks, heat exchangers, and scrubbers.
Huaxiao Metal Case Example:
In 2024, Huaxiao Metal successfully supplied Incoloy 825 alloy plates and pipes to a Middle Eastern chemical project. Our services included full documentation, packaging, and logistics support. The client achieved 25% longer equipment lifespan compared to using 316L stainless steel.
Which is Better? Incoloy 800 vs 825 Alloy
The choice between Incoloy 800 and 825 depends on your application requirements:
| Project Environment | Recommended Alloy | Reason |
|---|---|---|
| High-temperature oxidizing furnaces | Incoloy 800 | Superior oxidation resistance |
| Sulfuric acid or phosphoric acid processing | Incoloy 825 | Strong acid corrosion resistance |
| Marine / Seawater systems | Incoloy 825 | Excellent chloride resistance |
| Heat exchangers / pressure vessels | Incoloy 800 | Cost-effective under heat stress |
| Pollution control / waste treatment | Incoloy 825 | Resists acid gases and condensates |
Not sure which to choose? Send us your project specs and our engineers will recommend the best alloy.
Why Choose Huaxiao Metal as Your Alloy Supplier?
Huaxiao Metal is a professional manufacturer and exporter of nickel-based and stainless steel materials. With over 15 years of industry experience, we have established stable partnerships with clients in Europe, the Middle East, South America, and Southeast Asia.
Our Advantages:
Large stock of Incoloy 800 and 825 materials.
Factory-direct pricing with full certification.
Custom cutting, welding, and forming services.
Comprehensive export support including packing, shipping, and customs clearance.
Technical support for material selection and performance verification.
FAQ – Incoloy 800 vs 825
What is the main difference between Incoloy 800 and 825?
Incoloy 800 is optimized for high-temperature oxidation resistance; Incoloy 825 is optimized for corrosion resistance in chemical and seawater environments.
Which alloy is better for high-temperature applications?
Incoloy 800 is preferable due to higher temperature tolerance.
Can Incoloy 825 withstand seawater?
Yes, Incoloy 825 has excellent resistance to chloride-induced corrosion and is widely used in seawater applications.
Which is cheaper, Incoloy 800 or 825?
Generally, Incoloy 800 is less expensive because it has a lower content of alloying elements (such as Mo and Cu), making it suitable for high-temperature but less corrosive environments. Incoloy 825, with its higher Mo and Cu content, is more suitable for highly corrosive environments, resulting in a higher price. If your application is primarily high-temperature and less corrosive, Incoloy 800 may be preferred. For a quote comparison, please contact Huaxiao Metal.
Can Incoloy 825 replace 800?
While Incoloy 825 outperforms 800 in most performance aspects (such as higher strength and corrosion resistance), Incoloy 800 may be more economical in purely high-temperature oxidizing/carburizing environments. Using 825, while offering higher performance, may unnecessarily increase costs. It is recommended to choose the best solution based on the specific application. Huaxiao Metal can help you select the most cost-effective option. Please submit your application data for analysis.
What certifications does Huaxiao Metal provide?
We can provide chemical composition reports, material certificates (Mill Test Certificates), mechanical property reports, non-destructive testing reports (such as UT/RT), export packaging photos, and FCL/LCL shipping records. Contact us for sample inspection certificates.
What forms of Incoloy 800/825 can Huaxiao Metal supply?
Plates, coils, rods, bars, seamless tubes, welded pipes, and custom components.
In Conclusion: Partner with Huaxiao Metal for Reliable Alloy Solutions
Incoloy 800 vs 825: each has unique strengths tailored to specific industrial needs. Understanding the differences in their chemical composition, mechanical properties, and corrosion resistance is critical for making an informed decision. Whether you need high-temperature durability or robust corrosion resistance, Huaxiao Metal offers a wide range of Incoloy products to meet your requirements.
Contact Huaxiao Metal today for:
Latest Incoloy 800 and Incoloy 825 prices
Material certificates and technical data sheets
Customized processing and export packaging solutions
Contact us today for pricing and expert guidance!
Huaxiao Special Alloy Steel Products
Inconel 617
Home › Steel Products › Special Alloy › Inconel Alloy › Inconel 617 Inconel 617 Supplier – UNS N06617 / W.Nr. 2.4663 Nickel Alloy Products UNS N06617 / 2.4663 — Co-Reinforced
Inconel 601
Home › Steel Products › Special Alloy › Inconel Alloy › Inconel 601 Inconel 601 — Al-Enhanced Heat Resistant Alloy UNS N06601 / 2.4851 / NiCr23Fe — Al₂O₃ protective film, industry-leading carburization
Inconel X-750
Inconel X-750 The Spring & Fastener Superalloy UNS N07750 — precipitation-hardened nickel superalloy with unmatched spring relaxation resistance to 815°C (1500°F). When springs must hold their
Inconel 600
Home › Steel Products › Special Alloy › Inconel Alloy › Inconel 600 Inconel 600 Supplier – UNS N06600 Nickel Alloy Products UNS N06600 / 2.4816 — Standard Ni-Cr High-Temperature Alloy
Inconel 718
Inconel 718 Nickel Superalloy — AMS 5662/5663 Bar, Forging, Sheet Supplier The strongest commercially available nickel-iron-chromium alloy. Gamma-prime & gamma-double-prime precipitation hardened to 1375 MPa
Inconel 625
Inconel 625 (UNS N06625 / 2.4856) — The Corrosion Champion of Nickel Superalloys Best Seller — Best Corrosion Resistance Huaxiao Metal supplies Inconel 625 sheet,
13-8 Mo Stainless Steel
13-8 Mo Stainless Steel Bar, Plate & Forging Supplier AMS 5629 / UNS S13800 / 1.4534 High-Strength PH Stainless Steel Huaxiao Metal supplies high-performance 13-8
17-7PH Stainless Steel
Leading 17-7PH Stainless Steel Supplier | AISI 631 Sheet, Strip, Coil & Foil in Stock Certified AMS 5528 / ASTM A693 / UNS S17700 Precipitation
15-5PH Stainless Steel
15-5PH Stainless Steel Supplier | UNS S15500 Plate & Bar Stock 15-5 PH Stainless Steel – High Toughness PH Grade Huaxiao Metal supplies 15-5PH stainless
