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S30601 Stainless Steel vs. R30035 Cobalt

S30601 stainless steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 36% 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 (9, in this case) are not shown.

For each property being compared, the top bar is S30601 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, % 37
9.0 to 46
Fatigue Strength, MPa 250
170 to 740
Poisson's Ratio 0.28
0.29
Reduction in Area, % 56
40 to 74
Shear Modulus, GPa 75
84 to 89
Tensile Strength: Ultimate (UTS), MPa 660
900 to 1900
Tensile Strength: Yield (Proof), MPa 300
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 370
320
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1310
1320
Specific Heat Capacity, J/kg-K 500
440
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Base Metal Price, % relative 20
100
Density, g/cm3 7.6
8.7
Embodied Carbon, kg CO2/kg material 3.9
10
Embodied Energy, MJ/kg 55
140
Embodied Water, L/kg 150
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 230
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 24
29 to 61
Strength to Weight: Bending, points 22
24 to 39
Thermal Shock Resistance, points 16
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.015
0 to 0.025
Chromium (Cr), % 17 to 18
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 56.9 to 60.5
0 to 1.0
Manganese (Mn), % 0.5 to 0.8
0 to 0.15
Molybdenum (Mo), % 0 to 0.2
9.0 to 10.5
Nickel (Ni), % 17 to 18
33 to 37
Nitrogen (N), % 0 to 0.050
0
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 5.0 to 5.6
0 to 0.15
Sulfur (S), % 0 to 0.013
0 to 0.010
Titanium (Ti), % 0
0 to 1.0