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AISI 308 Stainless Steel vs. Nickel 684

AISI 308 stainless steel belongs to the iron alloys classification, while nickel 684 belongs to the nickel alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AISI 308 stainless steel and the bottom bar is nickel 684.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
310
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 45
11
Fatigue Strength, MPa 210
390
Poisson's Ratio 0.28
0.29
Reduction in Area, % 57
17
Shear Modulus, GPa 78
76
Shear Strength, MPa 410
710
Tensile Strength: Ultimate (UTS), MPa 590
1190
Tensile Strength: Yield (Proof), MPa 230
800

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Maximum Temperature: Mechanical, °C 990
1000
Melting Completion (Liquidus), °C 1420
1370
Melting Onset (Solidus), °C 1380
1320
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 17
75
Density, g/cm3 7.8
8.3
Embodied Carbon, kg CO2/kg material 3.2
10
Embodied Energy, MJ/kg 46
140
Embodied Water, L/kg 150
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140
1610
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 21
40
Strength to Weight: Bending, points 20
30
Thermal Shock Resistance, points 13
34

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.3
Boron (B), % 0
0.0030 to 0.010
Carbon (C), % 0 to 0.080
0 to 0.15
Chromium (Cr), % 19 to 21
15 to 20
Cobalt (Co), % 0
13 to 20
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 64.1 to 71
0 to 4.0
Manganese (Mn), % 0 to 2.0
0 to 0.75
Molybdenum (Mo), % 0
3.0 to 5.0
Nickel (Ni), % 10 to 12
42.7 to 64
Phosphorus (P), % 0 to 0.045
0 to 0.015
Silicon (Si), % 0 to 0.75
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
2.5 to 3.3