What are the differences between Incoloy 800 and Inconel 625?
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What are the differences between Incoloy 800 and Inconel 625?
Incoloy 800 (iron-nickel-chromium alloy) is lower in price and has lower strength, but it offers better high-temperature creep/rupture strength and excellent resistance to carburization/oxidation, making it suitable for furnace components. Inconel 625 (high-nickel alloy with added molybdenum/niobium) boasts superior tensile strength/yield strength, fatigue resistance, and various corrosion resistance properties (resistance to pitting corrosion, crevice corrosion, and chloride stress corrosion cracking). Although more expensive, it is highly suitable for aerospace, marine, and chemical industries. The main difference lies in the higher nickel, molybdenum, and niobium content of Inconel 625, while Incoloy 800 has a higher iron content. Therefore, 625 is stronger, but 800 is more cost-effective in certain high-temperature applications.
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What is the maximum operating temperature of Incoloy 800?
If the deformation is 5% or more, the hot working temperature range for Incoloy alloys 800H and 800HT is 1740–2190°F (950–1200°C). If the hot deformation is less than 5%, the recommended hot working temperature range is 1560–1920°F (850–1050°C).
What is Incoloy 800?
Incoloy 800 is a versatile alloy designed for applications requiring excellent corrosion resistance, high strength, and heat resistance. It possesses numerous outstanding properties, such as excellent creep rupture strength and superior oxidation resistance up to 1050°C (1922°F). This makes it an ideal material for harsh environments such as petroleum refining.
What is Inconel 625?
Inconel 625 is a nickel-based superalloy known for its exceptional strength and corrosion resistance at high temperatures. It is an ideal choice for applications in seawater, chemical processing, heat exchangers, and more. Its many superior properties make it an indispensable material in numerous industries worldwide.
Comparison of the chemical compositions of Incoloy 800 and Inconel 625
| Element | Incoloy 800 (UNS N08800) | Inconel 625 (UNS N06625) |
|---|---|---|
| Nickel (Ni) | 30.0 – 35.0 % | ≥ 58.0 % |
| Chromium (Cr) | 19.0 – 23.0 % | 20.0 – 23.0 % |
| Iron (Fe) | ≥ 39.5 % | ≤ 5.0 % |
| Carbon (C) | ≤ 0.10 % | ≤ 0.10 % |
| Aluminum (Al) | 0.15 – 0.60 % | ≤ 0.40 % |
| Titanium (Ti) | 0.15 – 0.60 % | ≤ 0.40 % |
| Molybdenum (Mo) | – | 8.0 – 10.0 % |
| Niobium (Nb) | – | 3.15 – 4.15 % |
| Manganese (Mn) | ≤ 1.5 % | ≤ 0.50 % |
| Silicon (Si) | ≤ 1.0 % | ≤ 0.50 % |
| Copper (Cu) | ≤ 0.75 % | ≤ 0.50 % |
| Sulfur (S) | ≤ 0.015 % | ≤ 0.015 % |
| Phosphorus (P) | ≤ 0.045 % | ≤ 0.015 % |
| Al + Ti | 0.30 – 1.20 % | – |
Comparison of mechanical properties of Incoloy 800 and Inconel 625
| Property | Incoloy 800 (Annealed) | Inconel 625 (Annealed) |
|---|---|---|
| Tensile Strength (MPa, min) | 450 – 585 | 827 – 1034 |
| Yield Strength (0.2% Offset, MPa, min) | 170 – 310 | 414 – 586 |
| Elongation (% in 50 mm, min) | 30 | 30 |
| Hardness (Rockwell B) | 79 – 95 HRB | 96 – 100 HRB |
| Hardness (Rockwell C) | – | 20 – 24 HRC |
| Density (g/cm³) | 7.94 | 8.44 |
| Melting Range (°C) | 1350 – 1400 | 1290 – 1350 |
| Modulus of Elasticity (GPa) | 200 | 207 |
Incoloy 800 vs. Inconel 625 Comparison – Application Areas
The unique properties of Incoloy 800 and Inconel 625 determine their suitability for different application areas. Incoloy 800 is commonly used in the chemical industry, particularly in high-temperature and corrosive environments. Its excellent oxidation and carburization resistance make it an ideal material for furnaces, heat treatment equipment, and other industrial processes.
Inconel 625 is widely used in the aerospace, marine, and petrochemical industries. Its superior corrosion resistance, especially in chloride-containing environments, makes it an ideal material for equipment handling corrosive fluids. Furthermore, its high-temperature strength and fatigue resistance make it suitable for jet engines, gas turbines, and other components operating under demanding thermal conditions.
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
Gnee Steel is a supplier of incoloy 800 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with incoloy 800 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells incoloy 800, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
