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R30006 Cobalt vs. S45503 Stainless Steel

R30006 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 (14, in this case) are not shown.

For each property being compared, the top bar is R30006 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, % 1.0
4.6 to 6.8
Fatigue Strength, MPa 260
710 to 800
Poisson's Ratio 0.28
0.28
Rockwell C Hardness 40
46 to 54
Shear Modulus, GPa 85
75
Tensile Strength: Ultimate (UTS), MPa 900
1610 to 1850
Tensile Strength: Yield (Proof), MPa 540
1430 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.9
Embodied Carbon, kg CO2/kg material 7.8
3.4
Embodied Energy, MJ/kg 110
48
Embodied Water, L/kg 500
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
82 to 110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 29
57 to 65
Strength to Weight: Bending, points 24
39 to 43
Thermal Shock Resistance, points 26
56 to 64

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.010
Chromium (Cr), % 27 to 32
11 to 12.5
Cobalt (Co), % 48.6 to 68.1
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), % 0 to 1.0
0 to 0.5
Nickel (Ni), % 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 2.0
0 to 0.2
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
1.0 to 1.4
Tungsten (W), % 4.0 to 6.0
0