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R30075 Cobalt vs. AISI 347 Stainless Steel

R30075 cobalt belongs to the cobalt alloys classification, while AISI 347 stainless steel belongs to the iron alloys. There are 27 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 R30075 cobalt and the bottom bar is AISI 347 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
200
Elongation at Break, % 12
34 to 46
Fatigue Strength, MPa 250 to 840
220 to 270
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 82 to 98
77
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
610 to 690
Tensile Strength: Yield (Proof), MPa 480 to 840
240 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
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
3.6
Embodied Energy, MJ/kg 110
52
Embodied Water, L/kg 530
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
190 to 220
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
150 to 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
22 to 25
Strength to Weight: Bending, points 22 to 31
20 to 22
Thermal Diffusivity, mm2/s 3.5
4.3
Thermal Shock Resistance, points 21 to 29
13 to 15

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0 to 0.080
Chromium (Cr), % 27 to 30
17 to 19
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
64.1 to 74
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 0.5
9.0 to 13
Niobium (Nb), % 0
0 to 1.0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0