Alloy 825 and 625 are Nickel Chromium Alloys used for highly corrosive services with pitting. Major difference is 825 alloy contains 42% Nickel, 22% Cr and 3% Mo, 30% Fe, whereas 625 Alloy contains 60% Ni,22% Cr and 9% Mo, 3.5Cb.
In addition to above tensile and yield strength of alloy 625 is more than 825.
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