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R30605 Cobalt vs. S30601 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while S30601 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 21 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is S30601 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
37
Fatigue Strength, MPa 260 to 590
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
660
Tensile Strength: Yield (Proof), MPa 470 to 1600
300

Thermal Properties

Latent Heat of Fusion, J/g 290
370
Melting Completion (Liquidus), °C 1410
1360
Melting Onset (Solidus), °C 1330
1310
Specific Heat Capacity, J/kg-K 410
500
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.6
Embodied Carbon, kg CO2/kg material 9.8
3.9
Embodied Energy, MJ/kg 140
55
Embodied Water, L/kg 450
150

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
24
Strength to Weight: Bending, points 25 to 36
22
Thermal Shock Resistance, points 31 to 52
16

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.015
Chromium (Cr), % 19 to 21
17 to 18
Cobalt (Co), % 46.4 to 57
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 0 to 3.0
56.9 to 60.5
Manganese (Mn), % 1.0 to 2.0
0.5 to 0.8
Molybdenum (Mo), % 0
0 to 0.2
Nickel (Ni), % 9.0 to 11
17 to 18
Nitrogen (N), % 0
0 to 0.050
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 0.4
5.0 to 5.6
Sulfur (S), % 0 to 0.030
0 to 0.013
Tungsten (W), % 14 to 16
0