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Nickel 684 vs. SAE-AISI 8740 Steel

Nickel 684 belongs to the nickel alloys classification, while SAE-AISI 8740 steel belongs to the iron alloys. There are 27 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 nickel 684 and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
11 to 23
Fatigue Strength, MPa 390
270 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 710
370 to 400
Tensile Strength: Ultimate (UTS), MPa 1190
580 to 670
Tensile Strength: Yield (Proof), MPa 800
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Maximum Temperature: Mechanical, °C 1000
410
Melting Completion (Liquidus), °C 1370
1460
Melting Onset (Solidus), °C 1320
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 75
2.6
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 10
1.5
Embodied Energy, MJ/kg 140
20
Embodied Water, L/kg 360
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1610
390 to 850
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 40
20 to 24
Strength to Weight: Bending, points 30
20 to 22
Thermal Shock Resistance, points 34
17 to 20

Alloy Composition

Aluminum (Al), % 2.5 to 3.3
0
Boron (B), % 0.0030 to 0.010
0
Carbon (C), % 0 to 0.15
0.38 to 0.43
Chromium (Cr), % 15 to 20
0.4 to 0.6
Cobalt (Co), % 13 to 20
0
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 4.0
96.5 to 97.7
Manganese (Mn), % 0 to 0.75
0.75 to 1.0
Molybdenum (Mo), % 3.0 to 5.0
0.2 to 0.3
Nickel (Ni), % 42.7 to 64
0.4 to 0.7
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 0.75
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040
Titanium (Ti), % 2.5 to 3.3
0