Nickel 60%, Chromium 22%, Molybdenum 9%, Columbium plus Tantalum 4%
Alloy 625 is an austenitic nickel-base superalloy with excellent resistance to oxidation and corrosion over a broad range of conditions, including jet engine and chemical process applications. The outstanding strength and toughness of Alloy 625, at temperatures ranging from cryogenic to 2000°F (1093°C), are derived primarily from the solid solution strengthening of columbium and molybdenum in a nickel-chromium matrix.
Non-magnetic. Alloy 625 can be used for parts requiring both corrosion and oxidation resistance up to 2000ºF (1093°C). AMS 5666 requires a minimum yield strength of 60,000 psi at room temperature for bars under 4 inches in diameter. Mechanical properties for bars 4 inches in diameter and larger are to be agreed upon by purchaser and vendor. This alloy is exceptionally resistant to crevice corrosion and stress corrosion cracking and to chemical attack in both highly oxidizing to moderately reducing conditions. Alloy 625 is virtually immune to corrosion in marine environments and is used extensively in the hot section of jet engines and in high temperature corrosive environments in the chemical processing industry. The alloy has outstanding resistance to creep and stress rupture up to 1200ºF (649°C), and oxidation and scaling resistance up to 2000ºF (1093°C).
Hardness of Aerodyne stock is typically 185 BHN and never higher than 287 BHN by specification. The microstructure remains austenitic at both elevated and low temperatures. Alloy 625 cannot be hardened by heat treatment but can be hardened by cold working. During cold working, Alloy 625 work hardens more rapidly than austenitic stainless steels.
RATING: 16% of B-1112
TYPICAL STOCK REMOVAL RATE: 25 surface feet/minute with high speed tools. 100 surface feet/minute with carbide.
COMMENTS:
Use relatively heavy cuts and low speeds to minimize surface work hardening
0.305 lbs/in3, 8.44 g/cm3
· AMS 5666
· ASTM-B 446
· Line marked over 0.5 inch in diameter
· Predominantly produced by AOD-ESR melt. Hot worked, annealed, then centerless ground or rough turned.
· Lengths: 10-12 feet
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