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R30021 Cobalt vs. S45503 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S45503 stainless steel belongs to the iron alloys. There are 23 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 R30021 cobalt and the bottom bar is S45503 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
4.6 to 6.8
Fatigue Strength, MPa 250
710 to 800
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 32
46 to 54
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 700
1610 to 1850
Tensile Strength: Yield (Proof), MPa 500
1430 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 330
270
Melting Completion (Liquidus), °C 1350
1440
Melting Onset (Solidus), °C 1190
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
3.4
Embodied Energy, MJ/kg 110
48
Embodied Water, L/kg 520
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
82 to 110
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
57 to 65
Strength to Weight: Bending, points 21
39 to 43
Thermal Shock Resistance, points 21
56 to 64

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.010
Chromium (Cr), % 26 to 29
11 to 12.5
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 0 to 3.0
72.4 to 78.9
Manganese (Mn), % 0
0 to 0.5
Molybdenum (Mo), % 4.5 to 6.0
0 to 0.5
Nickel (Ni), % 2.0 to 3.0
7.5 to 9.5
Niobium (Nb), % 0
0.1 to 0.5
Phosphorus (P), % 0
0 to 0.010
Silicon (Si), % 0 to 1.5
0 to 0.2
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
1.0 to 1.4