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S30615 Stainless Steel vs. R30035 Cobalt

S30615 stainless steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S30615 stainless steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220 to 230
Elongation at Break, % 39
9.0 to 46
Fatigue Strength, MPa 270
170 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
84 to 89
Tensile Strength: Ultimate (UTS), MPa 690
900 to 1900
Tensile Strength: Yield (Proof), MPa 310
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Melting Completion (Liquidus), °C 1370
1440
Melting Onset (Solidus), °C 1320
1320
Specific Heat Capacity, J/kg-K 500
440
Thermal Conductivity, W/m-K 14
11
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 19
100
Density, g/cm3 7.6
8.7
Embodied Carbon, kg CO2/kg material 3.7
10
Embodied Energy, MJ/kg 53
140
Embodied Water, L/kg 170
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 260
210 to 5920
Stiffness to Weight: Axial, points 14
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 25
29 to 61
Strength to Weight: Bending, points 23
24 to 39
Thermal Diffusivity, mm2/s 3.7
3.0
Thermal Shock Resistance, points 16
23 to 46

Alloy Composition

Aluminum (Al), % 0.8 to 1.5
0
Boron (B), % 0
0 to 0.015
Carbon (C), % 0.16 to 0.24
0 to 0.025
Chromium (Cr), % 17 to 19.5
19 to 21
Cobalt (Co), % 0
29.1 to 39
Iron (Fe), % 56.7 to 65.3
0 to 1.0
Manganese (Mn), % 0 to 2.0
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 13.5 to 16
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 3.2 to 4.0
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0