Materials

INCONEL® 718 – 2.4668 – UNS N07718

Inconel alloy 718® is a high-strength, corrosion-resistant nickel chromium material used at -423º to 1300ºF (-217º to 704ºC). The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to postweld cracking, are oustanding. The ease and economy with which Inconel® 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.

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Products

INCONEL® 718
Availability
seamless-pipe Seamless Tubes
welded-pipe Welded Tubes
plate Plates
bar Bars  stock
flanges Flanges
accessories Fittings

Applications

  • Components for liquid fueled rockets
  • Rings, casings and various formed sheet metal parts for aircraft
  • Land based gas turbine engines, and cryogenic tankage

General characteristics

For most applications, alloy 718 is specified as solution annealed and precipitation hardened (precipitation hardening, age hardening, and
precipitation heat treatment are synonymous terms). Alloy 718 is hardened by the precipitation of secondary phases into the metal matrix.
If the material is to be machined, formed, or welded, it typically is purchased in the mill annealed or stress relieved condition. The material
is then fabricated in its most malleable condition. After fabrication, it can be heat treated as required per the applicable specification.

Technical information

Specifications

 

718 – UNS N07718
Product Norm ASTM
Seamless Tubes  
Welded Tubes  
Plates B-670
Bars B-637
Flanges B-637
Fittings  

Chemical specifications %

 

718 – UNS N07718
Element Simbol Maximum
Carbon C 0,08
Manganese Mn 0,35
Titanium Ti 0,65-1,15
Sulfur S 0,015
Silicon Si 0,35
Nickel Ni 50,0-55,0
Chrome Cr 17,0-21,0
Molybdenum Mo 2,80-,3,30
Aluminum Al 0,20-0,80
Niobium Nb 4,75-5,50
Phosphorus P 0,015
Iron Fe Balance

Mechanical Properties

718 – UNS N07718
Norm Rm min. Rp 0,2% min. E4d min.% Z min.% T.I.(J) HR B HB
B-637 185 (1275) 150 (1034) 12 15 331
B-670 180 (1241) 150 (1034) 12
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