Alloy 925 is a precipitation hardened nickel-iron-chromium alloy with additions of molybdenum, copper and aluminum. The alloy combines high strength and excellent corrosion resistance. The alloy has outstanding resistance to general corrosion, pitting, crevice corrosion and stress corrosion. Alloy 925 is used in various applications requiring a combination of high strength and corrosion resistance. Because of the alloy’s resistance to sulfide stress cracking and stress-corrosion cracking in “sour” (H2S containing) crude oil and natural gas, it is used for down-hole and surface gas- well components including tubular products, valves, hangers, landing nipples, tool joints and packers.