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SAE-AISI 8740 Steel vs. N06985 Nickel

SAE-AISI 8740 steel belongs to the iron alloys classification, while N06985 nickel belongs to the nickel alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is N06985 nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 11 to 23
45
Fatigue Strength, MPa 270 to 350
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
80
Shear Strength, MPa 370 to 400
480
Tensile Strength: Ultimate (UTS), MPa 580 to 670
690
Tensile Strength: Yield (Proof), MPa 380 to 570
260

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Maximum Temperature: Mechanical, °C 410
990
Melting Completion (Liquidus), °C 1460
1350
Melting Onset (Solidus), °C 1420
1260
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 39
10
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
1.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
55
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.5
8.8
Embodied Energy, MJ/kg 20
120
Embodied Water, L/kg 50
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
250
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 20 to 24
23
Strength to Weight: Bending, points 20 to 22
21
Thermal Diffusivity, mm2/s 10
2.6
Thermal Shock Resistance, points 17 to 20
16

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.015
Chromium (Cr), % 0.4 to 0.6
21 to 23.5
Cobalt (Co), % 0
0 to 5.0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 96.5 to 97.7
18 to 21
Manganese (Mn), % 0.75 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
6.0 to 8.0
Nickel (Ni), % 0.4 to 0.7
35.9 to 53.5
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
0 to 1.5