What is the difference between Inconel 625 and 825?
Incoloy 825 vs Inconel 625
Inconel is a nickel-based high-temperature alloy. Depending on the amount of nickel in the alloy, and taking into account many other parameters, we can grade Inconel differently. Two such grades are Inconel 625 and Incoloy 825. The main difference between the two is that Inconel 625 contains a high amount of nickel compared to Incoloy 825.
What is Inconel 625?
Inconel 625 contains more nickel than other grades of Inconel and it is a nickel-based high-temperature alloy. It has high strength and high resistivity at higher temperatures. It has very good protection against corrosion and oxidation. These particular advantages make it very useful in nuclear and marine applications.
The service temperature range of Inconel 625 alloy starts from cryogenic temperatures up to 982°C. The high strength of this alloy is due to the hardening effect of niobium and molybdenum in the nickel-chromium matrix. Therefore, precipitation hardening treatment is not required for Inconel alloy. Inconel 625 is an excellent choice for seawater applications due to its high tensile strength, high corrosion fatigue strength and resistance to chloride ion stress corrosion cracking. In addition, it exhibits excellent toughness and ductility at cryogenic temperatures.
