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Nickel 684 vs. S21800 Stainless Steel

Nickel 684 belongs to the nickel alloys classification, while S21800 stainless steel belongs to the iron alloys. They have a modest 28% 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 (3, in this case) are not shown.

For each property being compared, the top bar is nickel 684 and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
40
Fatigue Strength, MPa 390
330
Poisson's Ratio 0.29
0.28
Reduction in Area, % 17
62
Shear Modulus, GPa 76
75
Shear Strength, MPa 710
510
Tensile Strength: Ultimate (UTS), MPa 1190
740
Tensile Strength: Yield (Proof), MPa 800
390

Thermal Properties

Latent Heat of Fusion, J/g 320
340
Maximum Temperature: Mechanical, °C 1000
900
Melting Completion (Liquidus), °C 1370
1360
Melting Onset (Solidus), °C 1320
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 75
15
Density, g/cm3 8.3
7.5
Embodied Carbon, kg CO2/kg material 10
3.1
Embodied Energy, MJ/kg 140
45
Embodied Water, L/kg 360
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
250
Resilience: Unit (Modulus of Resilience), kJ/m3 1610
390
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
26
Strength to Weight: Axial, points 40
27
Strength to Weight: Bending, points 30
24
Thermal Shock Resistance, points 34
17

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 to 0.1
Chromium (Cr), % 15 to 20
16 to 18
Cobalt (Co), % 13 to 20
0
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 4.0
59.1 to 65.4
Manganese (Mn), % 0 to 0.75
7.0 to 9.0
Molybdenum (Mo), % 3.0 to 5.0
0
Nickel (Ni), % 42.7 to 64
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.015
0 to 0.060
Silicon (Si), % 0 to 0.75
3.5 to 4.5
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 2.5 to 3.3
0