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SAE-AISI 8645 Steel vs. Nickel 684

SAE-AISI 8645 steel belongs to the iron alloys classification, while nickel 684 belongs to the nickel 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 SAE-AISI 8645 steel and the bottom bar is nickel 684.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
310
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 23
11
Fatigue Strength, MPa 280 to 350
390
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
76
Shear Strength, MPa 380 to 400
710
Tensile Strength: Ultimate (UTS), MPa 600 to 670
1190
Tensile Strength: Yield (Proof), MPa 390 to 560
800

Thermal Properties

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

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
10
Embodied Energy, MJ/kg 20
140
Embodied Water, L/kg 50
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
1610
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 21 to 24
40
Strength to Weight: Bending, points 20 to 22
30
Thermal Shock Resistance, points 18 to 20
34

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.3
Boron (B), % 0
0.0030 to 0.010
Carbon (C), % 0.43 to 0.48
0 to 0.15
Chromium (Cr), % 0.4 to 0.6
15 to 20
Cobalt (Co), % 0
13 to 20
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 96.5 to 97.7
0 to 4.0
Manganese (Mn), % 0.75 to 1.0
0 to 0.75
Molybdenum (Mo), % 0.15 to 0.25
3.0 to 5.0
Nickel (Ni), % 0.4 to 0.7
42.7 to 64
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0.15 to 0.35
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.015
Titanium (Ti), % 0
2.5 to 3.3