Differences between Inconel 601 and Incoloy 825 alloy plates
Differences between Inconel 601 and Incoloy 825 alloy plates
Inconel 601 (nickel-chromium-iron alloy) plates contain added aluminum, resulting in excellent high-temperature oxidation/carburization resistance and thermal stability. In contrast, Incoloy 825 (nickel-iron-chromium-molybdenum-copper alloy) plates, due to the addition of molybdenum and copper, exhibit superior resistance to sulfuric and phosphoric acid corrosion, pitting corrosion, and stress corrosion cracking. Therefore, Incoloy 825 plates are more suitable for corrosive chemical environments, while Inconel 601 alloy plates are better suited for purely high-temperature applications, despite the lower iron content and higher nickel content in Inconel 601 thick plates.
Is Inconel 601 plate magnetic?
Inconel 601 plate is a non-magnetic nickel-chromium alloy with properties including high-temperature strength comparable to 18-8 alloys and high corrosion resistance to organic and inorganic corrosive agents. 601 alloy plate performs exceptionally well in temperature ranges from cryogenic temperatures up to 2000°F.
Inconel 601 plate is a sheet material rolled from a nickel-chromium-iron-aluminum reinforced alloy (Inconel 601). Its core characteristic is its unparalleled resistance to oxidation, carburization, and high-temperature sulfur corrosion at extreme temperatures up to approximately 1250°C, while maintaining good formability and weldability. It is specifically designed for demanding environments where sheet materials are exposed to severe oxidizing-reducing atmospheres and thermal cycling, such as high-temperature heat treatment furnaces, industrial combustion systems, petrochemical cracking units, and aerospace hot-end components. It is a key material for manufacturing ultra-high-temperature components such as furnace linings, radiant tubes, and high-temperature fixtures.
Incoloy 825 plate is a sheet material rolled from a nickel-iron-chromium alloy (Incoloy 825). Through the addition of elements such as molybdenum, copper, and titanium, it is specifically optimized to resist mixed corrosive environments of strong reducing acids (such as sulfuric acid) and oxidizing acids (such as nitric acid). It exhibits excellent resistance to stress corrosion cracking, pitting corrosion, and crevice corrosion, making it suitable for manufacturing corrosion-resistant structural components in harsh industrial environments such as linings for acidic oil and gas field equipment, chemical containers, seawater heat exchanger units, and flue gas desulfurization system components. It is a key sheet material for solving complex corrosion problems.
Chemical composition of Inconel 601 and Incoloy 825 plates
| Element | Inconel 601 Plate (UNS N06601) | Incoloy 825 Plate (UNS N08825) |
|---|---|---|
| Nickel (Ni) | 58.0 – 63.0 % | 38.0 – 46.0 % |
| Chromium (Cr) | 21.0 – 25.0 % | 19.5 – 23.5 % |
| Iron (Fe) | Balance | ≥ 22.0 % |
| Aluminum (Al) | 1.0 – 1.7 % | ≤ 0.2 % |
| Molybdenum (Mo) | – | 2.5 – 3.5 % |
| Copper (Cu) | ≤ 1.0 % | 1.5 – 3.0 % |
| Titanium (Ti) | ≤ 0.15 % | 0.6 – 1.2 % |
| Carbon (C) | ≤ 0.10 % | ≤ 0.05 % |
| Manganese (Mn) | ≤ 1.0 % | ≤ 1.0 % |
| Silicon (Si) | ≤ 0.5 % | ≤ 0.5 % |
| Sulfur (S) | ≤ 0.015 % | ≤ 0.03 % |
| Phosphorus (P) | – | ≤ 0.03 % |
Physical properties of Inconel 601 and Incoloy 825 plates
| Physical Property | Inconel 601 Plate (Annealed) | Incoloy 825 Plate (Annealed) |
|---|---|---|
| Density (g/cm³) | 8.11 | 8.14 |
| Melting Range (°C) | 1300 – 1370 | 1370 – 1400 |
| Modulus of Elasticity (GPa) | 210 | 196 |
| Thermal Conductivity (W/m·K, at 20°C) | 11.2 | 11.1 |
| Coefficient of Thermal Expansion (×10⁻⁶/K, 20–100°C) | 12.6 | 14.0 |
| Electrical Resistivity (μΩ·m, at 20°C) | 1.18 | 1.12 |
| Specific Heat (J/kg·K, at 20°C) | 444 | 440 |
| Magnetic Permeability | Typically non‑magnetic | Typically non‑magnetic |
| Poisson's Ratio | 0.29 | 0.28 |
Main Differences Between Inconel 601 and Incoloy 825 Plates
Composition:
Inconel 601 alloy plate: The main component is a nickel-chromium alloy, with added aluminum to improve oxidation resistance.
Incoloy 825 plate: A nickel-iron-chromium alloy, but the key is the addition of molybdenum (Mo) and copper (Cu) to improve acid resistance, and it also contains titanium (Ti).
Main Advantages of Inconel 601 and Incoloy 825 Plates:
Inconel 601 plate: High-temperature strength, oxidation resistance, and carburization resistance (e.g., used in furnace components).
Incoloy 825 alloy plate: Excellent corrosion resistance to various corrosive media, especially sulfuric acid corrosion and pitting corrosion.
Nickel Content of Inconel 601 and Incoloy 825 Plates:
Inconel 601 plate: Higher nickel content (Inconel 601 alloy plate has a nickel content of approximately 60%, higher than Incoloy 825 plate).
Incoloy 825 plate: Lower nickel content and higher iron content, making it more cost-effective in some applications.
When to choose which material:
Applications for Inconel 601 plate: furnace muffles, heat treatment baskets, high-temperature furnace components, and other applications requiring extremely high temperature resistance and oxidation resistance.
Applications for Incoloy 825 alloy plate: chemical processing, oil and gas (acidic environments), pickling tanks, and any applications requiring broad corrosion resistance to acids (sulfuric acid, phosphoric acid) and resistance to pitting/crevice corrosion.
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
Square Meters Built
Enterprise Employees
Years Experience
Partner countries
