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Alloy 718 (UNS N07718/W.Nr. 2.4668)
Common trade names: INCONEL 718
Alloy 718 is a high-strength, corrosion-resistant nickel chromium material used at -423° to 1300°F. The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to postweld cracking, are outstanding. The ease and economy with which Alloy 718 can be fabricated, combined with good tensile, fatigue, creep, and rupture strength, have resulted in its use in a wide range of applications
Inconel 718 Chemical composition:
Nickel (plus Cobalt) .......................................................................50.00-55.00
Chromium......................................................................................17.00-21.00
Iron ...............................................................................................Balance*
Niobium (plus Tantalum)................................................................4.75-5.50
Molybdenum .................................................................................2.80-3.30
Titanium.........................................................................................0.65-1.15
Aluminum ......................................................................................0.20-0.80
Cobalt ..........................................................................................1.00 max.
Carbon..........................................................................................0.08 max.
Manganese ..................................................................................0.35 max.
Silicon ..........................................................................................0.35 max.
Phosphorus..................................................................................0.015 max.
Sulfur............................................................................................0.015 max.
Boron ...........................................................................................0.006 max.
Copper...........................................................................................0.30 max.
Mechanical property
Yield Strength...........................................1034
(Mpa) Tensile Strength...........................1270 
(Mpa) Elongation......................................12 
(%) Reduction.............................................15
(%) Hardness .............................................331 
(HRC) Charpy Impact
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Corrosion resistant
Alloy 718 has excellent corrosion resistance to many media. This resistance, which is similar to that of other nickel-chromium alloys, is a function of its composition. Nickel contributes to corrosion resistance in many inorganic and organic, other than strongly oxidizing, compounds throughout wide ranges of acidity and alkalinity. It also is useful in combating chloride-ion stress-corrosion cracking. Chromium imparts an ability to withstand attack by oxidizing media and sulfur compounds. Molybdenum is known to contribute to resistance to pitting in many media.
Applications of Alloy 718 (UNS N07718/W.Nr. 2.4668)
Components for liquid fueled rockets, rings, casings and various formed sheet metal parts for aircraft and land-based gas turbine engines, and cryogenic tankage. It is also used for fasteners and instrumentation parts.Oil field applications