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SAE-AISI 8645 Steel vs. Nickel 718

SAE-AISI 8645 steel belongs to the iron alloys classification, while nickel 718 belongs to the nickel alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8645 steel and the bottom bar is nickel 718.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 23
12 to 50
Fatigue Strength, MPa 280 to 350
460 to 760
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
75
Shear Strength, MPa 380 to 400
660 to 950
Tensile Strength: Ultimate (UTS), MPa 600 to 670
930 to 1530
Tensile Strength: Yield (Proof), MPa 390 to 560
510 to 1330

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 410
980
Melting Completion (Liquidus), °C 1460
1340
Melting Onset (Solidus), °C 1420
1260
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 39
11
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
1.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
75
Density, g/cm3 7.8
8.3
Embodied Carbon, kg CO2/kg material 1.5
13
Embodied Energy, MJ/kg 20
190
Embodied Water, L/kg 50
250

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
140 to 390
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
660 to 4560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 21 to 24
31 to 51
Strength to Weight: Bending, points 20 to 22
25 to 35
Thermal Diffusivity, mm2/s 10
3.0
Thermal Shock Resistance, points 18 to 20
27 to 44

Alloy Composition

Aluminum (Al), % 0
0.2 to 0.8
Boron (B), % 0
0 to 0.0060
Carbon (C), % 0.43 to 0.48
0 to 0.080
Chromium (Cr), % 0.4 to 0.6
17 to 21
Cobalt (Co), % 0
0 to 1.0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 96.5 to 97.7
11.1 to 24.6
Manganese (Mn), % 0.75 to 1.0
0 to 0.35
Molybdenum (Mo), % 0.15 to 0.25
2.8 to 3.3
Nickel (Ni), % 0.4 to 0.7
50 to 55
Niobium (Nb), % 0
4.8 to 5.5
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0.15 to 0.35
0 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.015
Titanium (Ti), % 0
0.65 to 1.2