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Nickel 685 vs. S31803 Stainless Steel

Nickel 685 belongs to the nickel alloys classification, while S31803 stainless steel belongs to the iron alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 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 nickel 685 and the bottom bar is S31803 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 350
260
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
29
Fatigue Strength, MPa 470
370
Poisson's Ratio 0.29
0.27
Reduction in Area, % 20
50
Shear Modulus, GPa 77
80
Shear Strength, MPa 770
460
Tensile Strength: Ultimate (UTS), MPa 1250
710
Tensile Strength: Yield (Proof), MPa 850
500

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Maximum Temperature: Mechanical, °C 1000
1060
Melting Completion (Liquidus), °C 1380
1450
Melting Onset (Solidus), °C 1330
1400
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 75
17
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 10
3.6
Embodied Energy, MJ/kg 140
49
Embodied Water, L/kg 340
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
180
Resilience: Unit (Modulus of Resilience), kJ/m3 1820
630
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 42
25
Strength to Weight: Bending, points 31
23
Thermal Diffusivity, mm2/s 3.3
4.3
Thermal Shock Resistance, points 37
20

Alloy Composition

Aluminum (Al), % 1.2 to 1.6
0
Boron (B), % 0.0030 to 0.010
0
Carbon (C), % 0.030 to 0.1
0 to 0.030
Chromium (Cr), % 18 to 21
21 to 23
Cobalt (Co), % 12 to 15
0
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 0 to 2.0
63.7 to 71.9
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 5.0
2.5 to 3.5
Nickel (Ni), % 49.6 to 62.5
4.5 to 6.5
Nitrogen (N), % 0
0.080 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 2.8 to 3.3
0
Zinc (Zn), % 0.020 to 0.12
0