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Nickel 684 vs. S21640 Stainless Steel

Nickel 684 belongs to the nickel alloys classification, while S21640 stainless steel belongs to the iron alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 nickel 684 and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
46
Fatigue Strength, MPa 390
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 76
78
Shear Strength, MPa 710
520
Tensile Strength: Ultimate (UTS), MPa 1190
740
Tensile Strength: Yield (Proof), MPa 800
350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1000
940
Melting Completion (Liquidus), °C 1370
1430
Melting Onset (Solidus), °C 1320
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 13
17

Otherwise Unclassified Properties

Base Metal Price, % relative 75
17
Density, g/cm3 8.3
7.7
Embodied Carbon, kg CO2/kg material 10
3.6
Embodied Energy, MJ/kg 140
51
Embodied Water, L/kg 360
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
280
Resilience: Unit (Modulus of Resilience), kJ/m3 1610
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 40
27
Strength to Weight: Bending, points 30
23
Thermal Shock Resistance, points 34
16

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 0.080
Chromium (Cr), % 15 to 20
17.5 to 19.5
Cobalt (Co), % 13 to 20
0
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 4.0
63 to 74.3
Manganese (Mn), % 0 to 0.75
3.5 to 6.5
Molybdenum (Mo), % 3.0 to 5.0
0.5 to 2.0
Nickel (Ni), % 42.7 to 64
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0 to 0.015
0 to 0.060
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 2.5 to 3.3
0