Inconel products are made from nickel-chromium superalloys, designed for use in applications where ordinary steels would fail. When exposed to high temperatures, Inconel materials creates an oxide protective layer providing an increased level of resistance to corrosion, oxidation and creep. No matter the types of Inconel when they are developed, and produced correctly, Inconel parts will continue to perform in overly extreme environments: furnaces, nuclear high-energy reactants, chemical plants, marine piping, and jet engines for example. Many different types of Inconel exist, each designed to perform in a specific operating environment or condition. By understanding many types of Inconel grades & Inconel alloy grades, you can find a grade that meets your requirements for the best cost.
What Are Inconel Grades?
Inconel Grades & Properties
Inconel 600 (UNS N06600)
Inconel 625 (UNS N06625)
Inconel 625 is an alloy strengthened by molybdenum & niobium. It is typically produced by vacuum induction melting followed by hot working & annealing. The alloy combines high tensile strength with excellent resistance to pitting, crevice corrosion and chloride induced stress cracking. It performs well at temperatures up to roughly 980 °C (1 800 °F) and in acidic and seawater environments. Typical applications include seawater piping, marine hardware, pollution control systems, chemical processing equipment and bellows. It is also used in aerospace exhaust systems where corrosion resistance is essential.
Inconel 718 (UNS N07718)
Inconel 800 (UNS N08800)
Inconel 825 (UNS N08825)
| Grade | Key properties | Typical applications |
| 600 | Solid‑solution alloy; resistant to oxidation; non‑magnetic; works from cryogenic to 1 100 °C | Heat‑treating fixtures, nitriding containers, furnace parts, chemical‑processing equipment, nuclear reactor water systems |
| 625 | Solid‑solution; strengthened by molybdenum and niobium; resists pitting and crevice corrosion; useful to ~980 °C | Seawater piping, marine hardware, “pollution‑control scrubbers, chemical plant equipment, aerospace exhaust systems |
| 718 | Age‑hardenable; very high tensile and yield strength; service range −250 °C to 705 °C; good weldability | Gas‑turbine engines, rocket motors, liquid‑fuelled rockets, cryogenic tanks, high‑pressure valves, aerospace fasteners |
| 800 | Nickel–iron–chromium alloy; good structural stability and creep strength; resists carburization and oxidation | Petrochemical heaters, heat exchangers, carburizing equipment, nuclear steam generator tubes |
| 825 | Contains molybdenum and copper; improved resistance to pitting and reducing acids; strong to 540 °C | Acid‑production equipment, pickling hooks, seawater heat exchangers, pollution control, nuclear reprocessing |
How to Choose the Right Inconel Grade?
- Temperature: Grades 600 and 625 handle roughly 2 000 °F and 1 800 °F; the precipitation‑hardened 718 offers strength around 1 300 °F.
- Corrosion environment: For oxidizing or chloride media, choose 600; for seawater or acidic service, 625 resists pitting and crevice corrosion; 825 handles a wide range of oxidizing and reducing acids.
- Mechanical load: High‑stress applications like turbine disks call for 718, whereas moderate stresses in corrosive environments suit 600, 625 or 825.
- Fabrication and codes: Grades 718 and 825 weld readily. Check applicable codes: nuclear steam generators often specify 800 and aerospace standards commonly require 718.
Why choose Kalpataru Piping Solutions for Inconel Products?
Conclusion
Frequently Asked Questions About Inconel Grades
What are the different types of Inconel?
The Inconel family includes a wide range of alloy grades, including 600, 601, 617, 625, 686, 690, 718, 725, 738, 751, X‑750 and others. Each of these Inconel alloy grades is tailored to specific combinations of temperature, strength and corrosion requirements.
Which Inconel grade is best for high temperatures?
For continuous service near 1 100 °C, Inconel 600 or its derivative 601 are excellent because they resist oxidation and carburization. Where high mechanical strength is also required, Inconel 718 retains very high tensile and yield strength up to about 705 °C.
How do Inconel 625 and 718 differ?
Inconel 625 is a solid‑solution alloy strengthened by molybdenum and niobium, giving it outstanding corrosion resistance in seawater and acidic environments but more moderate strength. Inconel 718, by contrast, is age‑hardenable; it offers much higher tensile and yield strength, making it suitable for gas turbines and rocket motors but slightly less resistant to certain acids.
Are Inconel grades suitable for marine environments?
Yes. Grades such as Inconel 625 and Incoloy 825 contain alloying elements that resist pitting, crevice corrosion and stress‑corrosion cracking in seawater. They are commonly used in seawater piping, desalination plants and marine exhaust systems.
Can Kalpataru supply custom Inconel products?
As both an Inconel manufacturer and supplier, Kalpataru offers custom‑sized pipes, plates, fittings and forged components in most Inconel grades. Technical experts can help you select the appropriate alloy and see that it meets the required specifications for your project.
