Inconel 600 vs Inconel 825 – What's the Difference?
Inconel 600 vs incoloy 825 – What's the Difference?
The main difference lies in their properties: Inconel 600 is a nickel-chromium alloy with excellent high-temperature oxidation resistance, while Incoloy 825 is a nickel-iron-chromium alloy with added molybdenum and copper, offering superior corrosion resistance to various corrosive environments, especially reducing acids such as sulfuric acid and phosphoric acid.
What are the uses of Inconel 825?
INCOLOY 825 alloy exhibits excellent corrosion resistance under various conditions, including both general and localized corrosion, making it widely applicable. Its applications include chemical processing, pollution control, oil and gas extraction, acid production, pickling operations, nuclear fuel reprocessing, and radioactive waste treatment.
Difference Between Inconel 625 and 825
Inconel 600
Inconel 600 is a nickel-chromium alloy with approximately 72% nickel and 14-17% chromium. The remaining components include iron and trace amounts of other elements such as manganese and silicon. Its high nickel content gives it excellent high-temperature resistance and oxidation resistance, making Inconel 600 suitable for harsh thermal environments.
Incoloy 825
Incoloy 825 is a nickel-iron-chromium alloy with 38-46% nickel, 19.5-23.5% chromium, and 38-46% iron. It also contains 2.5-3.5% molybdenum, 1.5-3.0% copper, and up to 0.4% titanium. These elements enhance its corrosion resistance, especially in reducing and chloride-rich environments.
Key alloying elements and their effects
| Element | Inconel 600 | Incoloy 825 | Impact on Alloy Performance |
|---|---|---|---|
| Nickel (Ni) | ~72% | 38-46% | Offers corrosion resistance and durability |
| Chromium (Cr) | 14-17% | 19.5-23.5% | Enhances oxidation resistance; higher in Incoloy 825 provides better resistance to some acids |
| Iron (Fe) | Balance (~6-10%) | 38-46% | Provides structural support; higher in Incoloy 825 |
| Molybdenum (Mo) | Trace or none | 2.5-3.5% | Improves resistance to pitting, crevice corrosion, and reducing environments (sulfuric, phosphoric acids) |
| Copper (Cu) | Trace or none | 1.5-3.0% | Enhances resistance to reducing agents and acids |
| Titanium (Ti) | Trace or none | Up to 0.4% | Stabilizes against intergranular corrosion |
| Manganese (Mn) | Small amounts | Small amounts | Generally controlled to limit detrimental effects |
| Silicon (Si) | Small amounts (strictly controlled) | Small amounts | Affects oxidation and mechanical properties |
Inconel 600 vs Incoloy 825 – Chemical Composition
| Element | Inconel 600 (%) | Incoloy 825 (%) |
|---|---|---|
| Nickel (Ni) | ≥ 72.0 | 38.0 - 46.0 |
| Chromium (Cr) | 14.0 - 17.0 | 19.5 - 23.5 |
| Iron (Fe) | 6.0 - 10.0 | ≥ 22.0 |
| Molybdenum (Mo) | - | 2.5 - 3.5 |
| Copper (Cu) | ≤ 0.5 | 1.5 - 3.0 |
| Carbon (C) | ≤ 0.15 | ≤ 0.05 |
| Manganese (Mn) | ≤ 1.0 | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 | ≤ 0.5 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.03 |
| Aluminum (Al) | - | ≤ 0.2 |
| Titanium (Ti) | - | 0.6 - 1.2 |
Inconel 600 vs Incoloy 825 – Mechanical Properties
| Property | Inconel 600 (Annealed) | Incoloy 825 (Annealed) |
|---|---|---|
| Tensile Strength | 550-655 MPa (80-95 ksi) | 586-689 MPa (85-100 ksi) |
| Yield Strength (0.2% Offset) | 240-310 MPa (35-45 ksi) | 241-345 MPa (35-50 ksi) |
| Elongation | 35-45% | 30-45% |
| Hardness (Brinell) | 150-220 HB | 150-210 HB |
| Density | 8.47 g/cm³ | 8.14 g/cm³ |
| Melting Range | 1370-1425°C (2500-2600°F) | 1370-1400°C (2500-2550°F) |
| Elastic Modulus | 214 GPa (31×10⁶ psi) | 196 GPa (28.4×10⁶ psi) |
| Poisson's Ratio | 0.29 | 0.28 |
Inconel 600 vs Incoloy 825 – Applications
| Application Area | Inconel 600 | Incoloy 825 |
|---|---|---|
| Primary Strength | High-temperature strength & oxidation resistance | Excellent corrosion resistance in various acidic environments |
| Chemical Processing | Furnace components, heat treatment retorts, catalyst support grids | Sulfuric acid pickling tanks, phosphoric acid evaporators, acid handling systems |
| Thermal Processing | Heating element sheaths, radiant tubes, basket annealing fixtures | - |
| Power Generation | Nuclear reactor components, steam generator tubing | - |
| Aerospace | Jet engine components, combustion chambers | - |
| Marine Engineering | - | Seawater cooling systems, marine piping, offshore platform components |
| Oil & Gas | - | Sour gas well components, piping systems in corrosive oil extraction |
| Pollution Control | - | Flue gas desulfurization systems, scrubbers, waste treatment equipment |
| Acid Production | - | Sulfuric and phosphoric acid manufacturing equipment |
| Industrial Heating | High-temperature furnace internals (≥1000°C/1832°F) | Moderate temperature chemical reactors |
| Nuclear Applications | Control rod cladding, primary circuit components | Nuclear fuel reprocessing, radioactive waste handling |
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
