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R30605 Cobalt vs. S45500 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while S45500 stainless steel belongs to the iron alloys. They have a modest 22% 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 S45500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
3.4 to 11
Fatigue Strength, MPa 260 to 590
570 to 890
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
1370 to 1850
Tensile Strength: Yield (Proof), MPa 470 to 1600
1240 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Melting Completion (Liquidus), °C 1410
1440
Melting Onset (Solidus), °C 1330
1400
Specific Heat Capacity, J/kg-K 410
470
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.9
Embodied Carbon, kg CO2/kg material 9.8
3.8
Embodied Energy, MJ/kg 140
57
Embodied Water, L/kg 450
120

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 33 to 55
48 to 65
Strength to Weight: Bending, points 25 to 36
35 to 42
Thermal Shock Resistance, points 31 to 52
48 to 64

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.050
Chromium (Cr), % 19 to 21
11 to 12.5
Cobalt (Co), % 46.4 to 57
0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 0 to 3.0
71.5 to 79.2
Manganese (Mn), % 1.0 to 2.0
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 9.0 to 11
7.5 to 9.5
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
0.8 to 1.4
Tungsten (W), % 14 to 16
0

Comparable Variants