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R30001 Cobalt vs. S15700 Stainless Steel

R30001 cobalt belongs to the cobalt alloys classification, while S15700 stainless steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R30001 cobalt and the bottom bar is S15700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
1.1 to 29
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 620
1180 to 1890

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Melting Completion (Liquidus), °C 1530
1440
Melting Onset (Solidus), °C 1260
1400
Specific Heat Capacity, J/kg-K 430
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.6

Otherwise Unclassified Properties

Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 8.9
3.4
Embodied Energy, MJ/kg 130
47
Embodied Water, L/kg 460
140

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 19
42 to 67
Strength to Weight: Bending, points 18
32 to 43
Thermal Diffusivity, mm2/s 3.7
4.2
Thermal Shock Resistance, points 19
39 to 63

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 2.0 to 3.0
0 to 0.090
Chromium (Cr), % 28 to 32
14 to 16
Cobalt (Co), % 43 to 59
0
Iron (Fe), % 0 to 3.0
69.6 to 76.8
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
2.0 to 3.0
Nickel (Ni), % 0 to 3.0
6.5 to 7.7
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 11 to 13
0