Nickel Alloy 625, frequently called Inconel® 625, is a corrosion and heat-resistant Nickel-based alloy. It is alloyed with Chromium and Iron, along with Niobium-Tantalum and Molybdenum for increased toughness and strength. It is nonmagnetic, and corrosion and oxidation-resistant, with service temperatures ranging from cryogenic to 1800°F. Because of its alloy matrix, precipitation hardening treatments are not required. This alloy is generally double-melted, with either EF-AOD melt (Electric Furnace followed by Argon Oxygen Decarburization) or VIM (Vacuum Induction Melt); and with a second melt by either VAR (Vacuum Arc Remelt), or ESR (Electroslag Reduction).
This alloy exhibits excellent corrosion resistance to salt and fresh water, alkaline environments, and air. It is resistant to both oxidizing and non-oxidizing environments, and chloride stress corrosion cracking. Chloride stress corrosion cracking resistance is excellent. The alloy resists scaling and oxidation at high temperatures.
625 Nickel Applications:
Nickel Alloy 625 aerospace applications include jet engine exhaust systems, propeller blades, heat exchangers, and aircraft applications. It’s also used for heat shields, furnace hardware, chemical plant equipment, and seawater applications.