Inconel 718

Inconel 718

Nickel (Ni) - 52.5 Median
(50.0 Min - 55.0 Max)
Chromium (Cr) - 19.0 Median
(17.0 Min - 21.0 Max)
Molybdenum (Mo) - 3.05 Median
(2.8 Min - 3.3 Max)
Iron (Fe) - 17.46825 Balance
Niobium (Nb) - 5.125 Median
(4.75 Min - 5.5 Max)
Other

Key

Nickel
Copper
Chromium
Aluminum
Molybdenum
Iron
Titanium
Manganese
Cobalt
Other
  • Nickel (Ni) 52.5 Median
    (50.0 Min - 55.0 Max)
  • Copper (Cu) 0.155 Median
    (0.01 Min - 0.3 Max)
  • Chromium (Cr) 19.0 Median
    (17.0 Min - 21.0 Max)
  • Aluminum Al 0.5 Median
    (0.2 Min - 0.8 Max)
  • Molybdenum (Mo) 3.05 Median
    (2.8 Min - 3.3 Max)
  • Iron (Fe) 17.46825 Balance
  • Manganese (Mn) 0.35 Max
  • Cobalt (Co) 0.505 Median
    (0.01 Min - 1.0 Max)
  • Silicon (Si) 0.35 Max
  • Phosphorus (P) 0.015 Max
  • Lead (Pb) 0.0006 Max
  • Boron (B) 0.0006 Max
  • Antimony (Sb) 0.015 Max
  • Sulfur (S) 0.015 Max
  • Bismuth (Bi) 0.00005 Max
  • Selenium (Se) 0.0005 Max
  • Tantalum (Ta) 0.05 Max
  • Niobium (Nb) 5.125 Median
    (4.75 Min - 5.5 Max)
  • Titanium (Ti) 0.9

UNS N07718

Inconel 718 provides very high strength with good corrosion resistance. A precipitation hardening process is required to produce the high tensile strengths, which can exceed 200 KSI. It is highly resistant to chloride and sulfide stress corrosion cracking. Inconel 718 fasteners have been used in environments from -400º F (-250º C) to 1300º F (700º C). Typical applications include gas turbine parts and cryogenic storage tanks.

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Summary

  • Environment:
    Severe Environments: Hot Concentrated Acids & Chemicals
  • Temperature Limit:
    1300 °F / 704 °C
  • Ultimate Tensile (Typical):
    210 ksi / 1448 mpa

Specifications & Technical Data

If your question isn’t answered below, download the complete technical data sheet here.

Specifications

  • Plate, Sheet & Strip: AMS 5596, AMS 5597
  • Rod & Bar: ASTM B637, ASME SB637
  • Seamless Pipe & Tube: ASTM B983
  • Forgings: ASTM B637, ASME SB637
  • Others: NACE MR0175, ISO 15156

Physical Properties

Physical Property Imperial Units Metric Units
Density RT 0.297 lb/in3 RT 8.23 g/cm3
Melting Range 2300-2435°F 1260-1335°C
Electrical Resistivity RT 47.5 μ0hm.in RT 121 μ0hm.cm
200°F 48.0 μ0hm.in 100°C 122 μ0hm.cm
400°F 49.4 μ0hm.in 200°C 125 μ0hm.cm
600°F 50.3 μ0hm.in 300°C 127 μ0hm.cm
800°F 50.7 μ0hm.in 400°C 129 μ0hm.cm
1000°F 51.6 μ0hm.in 500°C 130 μ0hm.cm
1200°F 52.0 μ0hm.in 600°C 132 μ0hm.cm
1400°F 52.2 μ0hm.in 700°C 132 μ0hm.cm
1600°F 52.1 μ0hm.in 800°C 132 μ0hm.cm
1800°F 52.4 μ0hm.in 900°C 133 μ0hm.cm
1000°C 133 μ0hm.cm
Thermal Conductivity RT 79 btu.in/h.ft2.°F RT 11.4 W/m.°C
200°F 87 btu.in/h.ft2.°F 100°C 12.6 W/m.°C
400°F 100 btu.in/h.ft2.°F 200°C 14.3 W/m.°C
600°F 112 btu.in/h.ft2.°F 300°C 15.9 W/m.°C
800°F 124 btu.in/h.ft2.°F 400°C 17.5 W/m.°C
1000°F 136 btu.in/h.ft2.°F 500°C 19.0 W/m.°C
1200°F 148 btu.in/h.ft2.°F 600°C 20.6 W/m.°C
1400°F 161 btu.in/h.ft2.°F 700°C 22.2 W/m.°C
1600°F 173 btu.in/h.ft2.°F 800°C 23.8 W/m.°C
1800°F 186 btu.in/h.ft2.°F 900°C 25.4 W/m.°C
100°C 27.1 W/m.°C
Mean Coefficient of Thermal Expansion

70-200°F 7.1 μin/in. °F 25-100°C 12.8 μm/m.°C
70-400°F 7.5 μin/in. °F 25-200°C 13.5 μm/m.°C
70-600°F 7.7 μin/in. °F 25-300°C 13.8 μm/m.°C
70-800°F 7.9 μin/in. °F 25-400°C 14.1 μm/m.°C
70-1000°F 8.0 μin/in. °F 25-500°C 14.3 μm/m.°C
70-1200°F 8.4 μin/in. °F 25-600°C 14.8 μm/m.°C
70-1400°F 8.9 μin/in. °F 25-700°C 15.5 μm/m.°C
70-1600°F 9.4 μin/in. °F 25-800°C 16.3 μm/m.°C
25-900°C 17.2 μm/m.°C
Dynamic Modulus of Elasticity RT 29.0 x 106 psi RT 200 GPa
200°F 28.4 x 106 psi 200°C 195 GPa
400°F 27.6 x 106 psi 300°C 191 GPa
600°F 26.7 x 106 psi 400°C 185 GPa
800°F 25.8 x 106 psi 500°C 179 GPa
1000°F 24.8 x 106 psi 600°C 173 GPa
1200°F 23.7 x 106 psi 700°C 167 GPa
1400°F 22.3 x 106 psi 800°C 159 GPa
1600°F 20.2 x 106 psi 900°C 149 GPa
1800°F 17.4 x 106 psi 1000°C 134 GPa

RT= Room Temperature

Tensile Properties

Plate Tensile Data
Test Temperature
Ultimate Tensile Strength
0.2% Yield Strength Elongation
°F °C ksi MPa ksi MPa %
RT RT 200.5 1382 167.8 1157 20.6
800 427 173.1 1193 149.0 1027 22.6
1000 538 170.2 1173 145.9 1006 21.8
1200 649 162.5 1120 139.9 965 25.1
1400 760 117.3 809 104.9 723 12.1
1600 871 42.2 291 34.3 236 68.0
1800 982 14.1 97 9.6 66 129.9

Mill Annealed + 1325°F/8h/Furnace Cool to 1150°F/8h/Air Cool      Total time: 18 hours
RT= Room Temperature

 

Sheet Tensile Data
Test Temperature
Ultimate Tensile Strength
0.2% Yield Strength Elongation
°F °C ksi MPa ksi MPa %
RT RT 203.6 1404 174.7 1205 18.4
800 427 176.2 1215 155.4 1071 21.3
1000 538 172.3 1188 150.2 1036 20.7
1200 649 164.1 1131 144.3 995 16.3
1400 760 114.8 792 103.8 716 6.9
1600 871 39.9 275 34.0 234 81.8
1800 982 13.7 94 9.7 67 175.6

Mill Annealed + 1325°F/8h/Furnace Cool to 1150°F/8h/Air Cool
Total time: 18 hours

 

Tensile Properties of Solution-annealed 718 at Room Temperature
Form
Ultimate Tensile Strength
Yield Strength Elongation
ksi MPa ksi MPa %
Plate 126.3 871 60.7 419 46.7
Sheet 124.3 857 57.3 395 49

 

Creep and Stress-Rupture Strengths

HAYNES® 718 Sheet, Age-Hardened*
Temperature Creep Approximate Initial Stress to Produce Specified Creep in
10h 100h 1,000h
°F °C % ksi MPa ksi MPa ksi MPa
1000 538 0.5 157 1083 146 1007 132 910
1 160 1103 150 1034 138 952
R 165 1138 144 993
1100 593 0.5 140 965 126 869 108 745
1 143 986 130 896 112 772
R 150 1034 134 924 115 793
1200 649 0.5 121 834 101 696 75 517
1 124 855 103 710 78 538
R 130 896 105 724 87 600
1300 704 0.5 95 655 64 441 35 241
1 98 676 67 462 41 283
R 106 731 76 524 46 317
1400 760 0.5 54 372 24 165 3.8 26
1 60 414 28 193 5.1 35
R 70 483 37 255 17 117

*Samples were age hardened by treating at 1325°F (718°C)/8h/FC to 1150°F (621°C)/8h/AC

Hardness and Grain Size

Cold-work Hardness
% Cold-Work Average Hardness HRBW/ C
0 92.4 HRBW
10 27.2 HRC
20 33.6 HRC
30 36.9 HRC
40 38.3 HRC
50 39.2 HRC

HRBW = Hardness Rockwell “B”, Tungsten Indentor.
HRC= Hardness Rockwell “C”.

Hardness and Grain Size
Form Hardness, HRBW Typical ASTM Grain Size
Sheet 94 6 – 8
Plate 93 5 – 8

All samples tested in solution-annealed condition.
HRBW = Hardness Rockwell “B”, Tungsten Indentor.

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