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Incoloy925,alloy 925,UNS N09925 is an agehardenable  nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminum. The alloy鈥檚 chemical comb, listed in Table 1, is designed to provide a combination of high strength and excellent corrosion resistance. The nickel content is  sufficient for protection against chloride-ion stresscorrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing chemicals. The molybdenum aids resistance to pitting and crevice corrosion. The alloy鈥檚 chromium content provides resistance to oxidizing environments. The titanium and aluminum additions cause a strengthening reb during heat treatment. INCOLOY alloy 925 is used in various applications requiring a combination of high strength and corrosion resistance. Because of the alloy鈥檚 resistance to sulfide stress cracking and stress-corrosion cracking in 鈥渟our鈥� (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. The alloy is also useful for fasteners, marine and pump shafting and high-strength piping systems.
 
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