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R30006 Cobalt vs. S17700 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S17700 stainless steel belongs to the iron alloys. They have a modest 21% 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 (8, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
1.0 to 23
Fatigue Strength, MPa 260
290 to 560
Poisson's Ratio 0.28
0.28
Rockwell C Hardness 40
41 to 46
Shear Modulus, GPa 85
76
Tensile Strength: Ultimate (UTS), MPa 900
1180 to 1650
Tensile Strength: Yield (Proof), MPa 540
430 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 320
290
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
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
2.7

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.7
Embodied Carbon, kg CO2/kg material 7.8
2.8
Embodied Energy, MJ/kg 110
40
Embodied Water, L/kg 500
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
15 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 670
460 to 3750
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
42 to 59
Strength to Weight: Bending, points 24
32 to 40
Thermal Diffusivity, mm2/s 3.9
4.1
Thermal Shock Resistance, points 26
39 to 54

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 0.9 to 1.4
0 to 0.090
Chromium (Cr), % 27 to 32
16 to 18
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
70.5 to 76.8
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
6.5 to 7.8
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), % 4.0 to 6.0
0