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R30075 Cobalt vs. S17600 Stainless Steel

R30075 cobalt belongs to the cobalt alloys classification, while S17600 stainless steel belongs to the iron alloys. 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 S17600 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
200
Elongation at Break, % 12
8.6 to 11
Fatigue Strength, MPa 250 to 840
300 to 680
Poisson's Ratio 0.29
0.28
Reduction in Area, % 20
28 to 50
Shear Modulus, GPa 82 to 98
76
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
940 to 1490
Tensile Strength: Yield (Proof), MPa 480 to 840
580 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1290
1390
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.9
Embodied Energy, MJ/kg 110
42
Embodied Water, L/kg 530
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
70 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
850 to 4390
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
34 to 54
Strength to Weight: Bending, points 22 to 31
28 to 37
Thermal Diffusivity, mm2/s 3.5
4.1
Thermal Shock Resistance, points 21 to 29
31 to 50

Alloy Composition

Aluminum (Al), % 0 to 0.1
0 to 0.4
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0 to 0.080
Chromium (Cr), % 27 to 30
16 to 17.5
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
71.3 to 77.6
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 0.5
6.0 to 7.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.1
0.4 to 1.2
Tungsten (W), % 0 to 0.2
0

Comparable Variants