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Inconel 718
    

A precipitation-hardenable nickel-chromium alloy also containing significant amounts of iron, niobium, and molybdenum along with lesser amounts of aluminum and titanium. It combines corrosion resistance and high strength with outstanding weldability including resistance to postweld cracking. The alloy has excellent creep-rupture strength at temperatures to 1300°F (700°C). Used in gas turbines, rocket motors, spacecraft, nuclear reactors, pumps, and tooling. INCONEL alloy 718SPF™ is a special version of INCONEL alloy 718, designed for superplastic forming.

UNS: N07718 / W.Nr.: 2.4668

Limiting Chemical Composition

Alloy

%

Ni+Co

Cr

Fe

B

C

Mn

S

Si

Nb+Ta

Ti

Al

Alloy 718

Max.

55.0

21.0

0.006

0.08

0.35

0.015

0.35

5.50

1.15

0.80

Min.

50.0

17.0

Bal

4.75

0.65

0.20

%

Mo

Co

P

Cu

 

Max.

3.30

1.0

0.015

0.3

 

Min.

2.80

 

Nominal Mechanical Properties solution + precipitation harden

Density

g/cm3

Melting Range  °C

Tensile Strength

Rm N/mm2

Yield Strength

RP 0.2N/mm2

Elongation

A5%

8.19

1260-1336

1275Mpa

1034Mpa

12

 Limiting Chemical Composition, %

                                    

For most applications, INCONEL 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 (e.g. gamma prime and gamma double-prime) into the metal matrix. The precipitation of these nickel- (aluminum, titanium, niobium) phases is induced by heat treating in the temperature range of 1100 to 1500°F. For this metallurgical reaction to properly take place, the aging constituents (aluminum, titanium, niobium) must be in solution (dissolved in the matrix); if they are precipitated as some other phase or are combined in some other form, they will not precipitate correctly and the full strength of the alloy with not be realized. To perform this function, the material must first be solution heat treated (solution annealed is a synonymous term). Two heat treatments are generally utilized for INCONEL alloy 718: Solution anneal at 1700-1850°F followed by rapid cooling, usually in water, plus precipitation hardening at 1325°F for 8 hours, furnace cool to 1150°F, hold at 1150°F for a total aging time of 18 hours, followed by air cooling. Solution anneal at 1900-1950°F followed by rapid cooling, usually in water, plus precipitation hardening at 1400°F for 10 hours, furnace cool to 1200°F, hold at 1200°F for a total aging time of 20 hours, followed by air cooling. 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.

Available Product Forms: Pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon, wire and extruded section

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