What's the difference between an Incoloy 825 flange and an Incoloy 800 flange?
What's the difference between an Incoloy 825 flange and an Incoloy 800 flange?
The main difference lies in the fact that, due to the addition of molybdenum and copper, Incoloy 825 flanges offer superior corrosion resistance, while Incoloy 800 flanges are better suited for high-temperature applications and are generally less expensive. Therefore, Incoloy 825 flanges are the preferred choice for corrosive environments such as chemical processing and marine applications, while Incoloy 800 flanges are better suited for high-temperature, less corrosive applications, such as heat exchangers.
What are the applications of Incoloy 800 alloy?
It is used in the manufacture of heat treatment equipment, such as baskets, pallets, and clamps. In chemical and petrochemical processing, this alloy is used in heat exchangers and other piping systems for nitric acid media, particularly suitable for applications requiring resistance to chloride stress corrosion cracking.
What is an Incoloy 825 flange?
Incoloy 825 flanges are corrosion-resistant nickel-based alloy flanges. They are made of austenitic stainless steel with added chromium, iron, and other elements such as molybdenum and copper. In highly corrosive environments, these alloys provide excellent resistance to pitting corrosion, crevice corrosion, and stress cracking. Incoloy 825 flanges also possess good mechanical properties, making them ideal for demanding applications such as chemical equipment and nuclear fuel processing components.
What is an Incoloy 800 flange?
Incoloy 800 flanges are high-temperature flanges made of a nickel-iron-chromium alloy with added aluminum and titanium. They exhibit excellent corrosion resistance, oxidation resistance, and carburization resistance at temperatures up to 1100°F (593°C). Therefore, these flanges are ideal for refineries, petrochemical plants, and other industries that require handling extreme temperatures. Furthermore, Incoloy 800 flanges retain excellent tensile strength and good fatigue resistance even after prolonged exposure to harsh environments.
Incoloy 825 Flanges vs. Incoloy 800 Flanges
Composition: Incoloy 825 flanges are a nickel-iron-chromium alloy containing molybdenum, copper, and titanium. It exhibits extremely high corrosion resistance, especially in acidic environments, and possesses good mechanical properties. Incoloy 800 flanges, on the other hand, are also a nickel-iron-chromium alloy but contain small amounts of aluminum and titanium. It also possesses corrosion resistance and good mechanical properties, but is more suitable for high-temperature environments with maximum temperatures up to 1100°C.
Heat Resistance: In terms of heat resistance, both Incoloy 825 and Incoloy 800 flanges have high melting points. However, Incoloy 800 flanges are better suited for high-temperature applications than Incoloy 825 flanges. The maximum operating temperature of Incoloy 825 flanges is 540°C, while Incoloy 800 flanges can withstand temperatures up to 1100°C. Therefore, if your project requires flanges capable of withstanding extreme high temperatures, Incoloy 800 flanges are the better choice.
Corrosion Resistance
Both Incoloy 825 and Incoloy 800 flanges exhibit excellent corrosion resistance. However, Incoloy 825 demonstrates stronger resistance in acidic environments such as sulfuric acid and phosphoric acid. It also exhibits high resistance to stress corrosion cracking and pitting corrosion. In contrast, Incoloy 800 alloy flanges are better suited for high-temperature environments and are more resistant to oxidation and carburization, which can occur in high-temperature environments.
Applications
Incoloy 825 flanges are commonly used in chemical equipment, oil and gas production, and pollution control. They are also used in marine and offshore engineering and nuclear fuel reprocessing. On the other hand, Incoloy 800 flanges are typically used in high-temperature applications such as furnace components, heat exchangers, and chemical and petrochemical processing equipment.
Comparison: Incoloy 825 vs. Incoloy 800
| Feature | Incoloy 825 | Incoloy 800 |
|---|---|---|
| Key Elements | Nickel-iron-chromium with added molybdenum and copper | Nickel-iron-chromium alloy |
| Corrosion Resistance | Superior resistance to pitting, crevice corrosion, and acidic environments (sulfuric, phosphoric) | Good corrosion resistance, but less resistant in aggressive media like chloride solutions |
| High-Temperature Use | Suitable for temperatures up to around 600°C (1112°F). Higher temperatures can decrease strength and ductility. | Excellent for high-temperature applications, with specific grades (800H/800HT) used at temperatures above 1500°F for creep and stress rupture resistance. |
| Common Applications | Pollution control equipment, pickling equipment, acid production, and oil and gas piping. | Heat exchangers, carburizing equipment, nuclear steam generators, and heat-element sheathing. |
| Cost | Generally higher initial cost. | Lower cost compared to Incoloy 825. |
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Incoloy alloy tubes/bars/plates/fittings/coils, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical property certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneemetal.com
Gnee Steel is a supplier of incoloy 800/825 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 800/825 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 800/825, 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.
