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Nickel 684 vs. SAE-AISI O7 Steel

Nickel 684 belongs to the nickel alloys classification, while SAE-AISI O7 steel belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is nickel 684 and the bottom bar is SAE-AISI O7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 1190
680 to 2110

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1370
1480
Melting Onset (Solidus), °C 1320
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 75
6.0
Density, g/cm3 8.3
7.9
Embodied Carbon, kg CO2/kg material 10
2.3
Embodied Energy, MJ/kg 140
33
Embodied Water, L/kg 360
52

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 40
24 to 74
Strength to Weight: Bending, points 30
22 to 46
Thermal Shock Resistance, points 34
23 to 70

Alloy Composition

Aluminum (Al), % 2.5 to 3.3
0
Boron (B), % 0.0030 to 0.010
0
Carbon (C), % 0 to 0.15
1.1 to 1.3
Chromium (Cr), % 15 to 20
0.35 to 0.85
Cobalt (Co), % 13 to 20
0
Copper (Cu), % 0 to 0.15
0 to 0.25
Iron (Fe), % 0 to 4.0
92.9 to 97.6
Manganese (Mn), % 0 to 0.75
0 to 1.0
Molybdenum (Mo), % 3.0 to 5.0
0 to 0.3
Nickel (Ni), % 42.7 to 64
0 to 0.3
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 0.75
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 2.5 to 3.3
0
Tungsten (W), % 0
1.0 to 2.0
Vanadium (V), % 0
0 to 0.4