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R30075 Cobalt vs. S30815 Stainless Steel

R30075 cobalt belongs to the cobalt alloys classification, while S30815 stainless steel belongs to the iron alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is S30815 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
200
Elongation at Break, % 12
45
Fatigue Strength, MPa 250 to 840
320
Poisson's Ratio 0.29
0.28
Reduction in Area, % 20
56
Shear Modulus, GPa 82 to 98
77
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
680
Tensile Strength: Yield (Proof), MPa 480 to 840
350

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1290
1360
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.4

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.1
3.3
Embodied Energy, MJ/kg 110
47
Embodied Water, L/kg 530
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
260
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
310
Stiffness to Weight: Axial, points 14 to 17
14
Stiffness to Weight: Bending, points 24 to 25
25
Strength to Weight: Axial, points 26 to 42
25
Strength to Weight: Bending, points 22 to 31
22
Thermal Diffusivity, mm2/s 3.5
4.0
Thermal Shock Resistance, points 21 to 29
15

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.050 to 0.1
Cerium (Ce), % 0
0.030 to 0.080
Chromium (Cr), % 27 to 30
20 to 22
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
62.8 to 68.4
Manganese (Mn), % 0 to 1.0
0 to 0.8
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 0.5
10 to 12
Nitrogen (N), % 0 to 0.25
0.14 to 0.2
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
1.4 to 2.0
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0