Friday 20 October 2017
  • Alloy 718 Material Data Sheets
  • Alloy 718 Material Data Sheets
  • Alloy 718 Material Data Sheets
  • Alloy 718 Material Data Sheets
  • Alloy 718 Material Data Sheets
  • Alloy 718 Material Data Sheets
  • Alloy 718 Material Data Sheets
Chemical Composition Cr Ni+Co Mo Cu Cb+Ta Al Ti C Fe Co Mn Si P S B
% Values (minimum) 17 50 2.80 - 4.75 0.35 0.65 -   - - - - - 0.001
% Values (minimum) 21 55 3.30 0.15 5.50 0.8 1.15 0.08 bal 1 0.35 0.35 .015 0.015 0.006

APPLICATION

  • Aerospace
  • Gas turbine engines
  • Cryogenic tankage
  • Fasteners
  • Instrumentation parts.

ESCRIPTION

Alloy 718 (UNS N07718/W.Nr. 2.4668) is a high-strength, corrosion-resistant nickel chromium material used at -423° to 1300°F. Typical composition limits are shown in Table 1. The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to postweld cracking, are outstanding.

CORROSION RESISTANCE

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.

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