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S31727 Stainless Steel vs. R30035 Cobalt

S31727 stainless steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220 to 230
Elongation at Break, % 40
9.0 to 46
Fatigue Strength, MPa 240
170 to 740
Poisson's Ratio 0.28
0.29
Reduction in Area, % 56
40 to 74
Shear Modulus, GPa 78
84 to 89
Tensile Strength: Ultimate (UTS), MPa 630
900 to 1900
Tensile Strength: Yield (Proof), MPa 270
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1390
1320
Specific Heat Capacity, J/kg-K 470
440
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 24
100
Density, g/cm3 8.0
8.7
Embodied Carbon, kg CO2/kg material 4.7
10
Embodied Energy, MJ/kg 64
140
Embodied Water, L/kg 180
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 190
210 to 5920
Stiffness to Weight: Axial, points 14
14 to 15
Stiffness to Weight: Bending, points 24
23 to 24
Strength to Weight: Axial, points 22
29 to 61
Strength to Weight: Bending, points 20
24 to 39
Thermal Shock Resistance, points 14
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.030
0 to 0.025
Chromium (Cr), % 17.5 to 19
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 2.8 to 4.0
0
Iron (Fe), % 53.7 to 61.3
0 to 1.0
Manganese (Mn), % 0 to 1.0
0 to 0.15
Molybdenum (Mo), % 3.8 to 4.5
9.0 to 10.5
Nickel (Ni), % 14.5 to 16.5
33 to 37
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0