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R30006 Cobalt vs. S40977 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S40977 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is S40977 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
21
Fatigue Strength, MPa 260
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
76
Tensile Strength: Ultimate (UTS), MPa 900
510
Tensile Strength: Yield (Proof), MPa 540
310

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
480
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
3.3

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
1.9
Embodied Energy, MJ/kg 110
27
Embodied Water, L/kg 500
97

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
92
Resilience: Unit (Modulus of Resilience), kJ/m3 670
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
18
Strength to Weight: Bending, points 24
18
Thermal Diffusivity, mm2/s 3.9
6.7
Thermal Shock Resistance, points 26
18

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.030
Chromium (Cr), % 27 to 32
10.5 to 12.5
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
83.9 to 89.2
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
0.3 to 1.0
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 4.0 to 6.0
0