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Nickel 718 vs. AISI 309S Stainless Steel

Nickel 718 belongs to the nickel alloys classification, while AISI 309S stainless steel belongs to the iron alloys. They have 51% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is nickel 718 and the bottom bar is AISI 309S stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 50
42
Fatigue Strength, MPa 460 to 760
210
Poisson's Ratio 0.29
0.27
Reduction in Area, % 34 to 64
51
Shear Modulus, GPa 75
78
Shear Strength, MPa 660 to 950
400
Tensile Strength: Ultimate (UTS), MPa 930 to 1530
580
Tensile Strength: Yield (Proof), MPa 510 to 1330
230

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Mechanical, °C 980
1080
Melting Completion (Liquidus), °C 1340
1420
Melting Onset (Solidus), °C 1260
1370
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 11
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 75
19
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 13
3.6
Embodied Energy, MJ/kg 190
51
Embodied Water, L/kg 250
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 390
190
Resilience: Unit (Modulus of Resilience), kJ/m3 660 to 4560
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 31 to 51
21
Strength to Weight: Bending, points 25 to 35
20
Thermal Diffusivity, mm2/s 3.0
4.0
Thermal Shock Resistance, points 27 to 44
13

Alloy Composition

Aluminum (Al), % 0.2 to 0.8
0
Boron (B), % 0 to 0.0060
0
Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 17 to 21
22 to 24
Cobalt (Co), % 0 to 1.0
0
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 11.1 to 24.6
58.1 to 66
Manganese (Mn), % 0 to 0.35
0 to 2.0
Molybdenum (Mo), % 2.8 to 3.3
0
Nickel (Ni), % 50 to 55
12 to 15
Niobium (Nb), % 4.8 to 5.5
0
Phosphorus (P), % 0 to 0.015
0 to 0.045
Silicon (Si), % 0 to 0.35
0 to 0.75
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0.65 to 1.2
0