INCOLOY alloy 925 (UNS N09925) is an age-hardenablenickel-iron-chromium alloy with additions of molybdenum, copper,titanium and aluminum. The alloy’s chemical composition, listed inTable 1, is designed to provide a combination of high strength andexcellent corrosion resistance. The nickel content is sufficientfor protection against chloride-ion stress corrosion cracking. Thenickel, in conjunction with the molybdenum and copper, also givesoutstanding resistance to reducing chemicals. The molybdenum aidsresistance to pitting and crevice corrosion. The alloy’s chromiumcontent provides resistance to oxidizing environments. The titaniumand aluminum additions cause a strengthening reaction during heattreatment.

INCOLOY alloy 925 is used in various applications requiring acombination of high strength

and corrosion resistance. Because of the alloy’s resistance tosulfide stress cracking and tress-corrosion

cracking in “sour” (H2S containing) crude oil and natural gas,it is used for down-hole and surface gas well components includingtubular products, valves, hangers, landing nipples, tool joints andpackers. The alloys is also useful for fasteners, marine and pumpshafting and high-strength piping systems.

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