The service temperatures of this superalloy range from cryogenic to 982°C. The high strength of this alloy is due to the stiffening effect of molybdenum and niobium, which locates in the nickel-chromium matrix. Therefore, this alloy does not require precipitation hardening treatments. The high corrosion-fatigue strength, high tensile strength and the resistance to chloride-ion stress-corrosion cracking make this alloy an excellent choice for seawater applications.
Apart from that, Inconel 625 shows an excellent ductility and toughness at low temperatures. When considering the microstructure of this alloy, it is a solid-solution matrix-stiffened face-centred-cubic alloy. Moreover, this alloy contains carbides rich with nickel, chromium, molybdenum, etc.
What is Inconel 825?
Inconel 825 is a nickel-based superalloy containing a moderate amount of nickel when compared to other grades of Inconel. It has a higher melting point but has a low tensile strength and a low yield strength. This alloy contains nickel and chromium along with molybdenum, copper and titanium. It has an exceptional corrosion resistance specifically, to aqueous corrosion. Moreover, it shows resistance to oxidizing and reducing acids, such as sulfuric acid, phosphoric acid, etc.
What is the Difference Between Inconel 625 and 825?
Inconel 625 is a nickel-based superalloy containing a high amount of nickel than other grades of Inconel whereas Inconel 825 is a nickel-based superalloy containing a moderate amount of nickel when compared to other grades of Inconel. The major difference between Inconel 625 and 825 is the nickel content; Inconel 625 contains about 58% of nickel while Inconel 825 contains about 36-48% of nickel. Moreover, they have different melting points as well. The melting point of Inconel 625 is 1350◦C, but it is 1400◦C for Inconel 825. Apart from that, another important difference between Inconel 625 and 825 is their strength; Inconel 625 has a very high tensile strength and a yield strength when compared to Inconel 825.