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R30003 Cobalt vs. S40945 Stainless Steel

R30003 cobalt belongs to the cobalt alloys classification, while S40945 stainless steel belongs to the iron alloys. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 R30003 cobalt and the bottom bar is S40945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 10 to 73
25
Fatigue Strength, MPa 320 to 560
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
75
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
430
Tensile Strength: Yield (Proof), MPa 510 to 1090
230

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1440
1410
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
26
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 95
8.0
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.2
Embodied Energy, MJ/kg 110
31
Embodied Water, L/kg 400
94

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 32 to 57
15
Strength to Weight: Bending, points 26 to 38
16
Thermal Diffusivity, mm2/s 3.3
6.9
Thermal Shock Resistance, points 26 to 45
15

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0 to 0.030
Chromium (Cr), % 19 to 21
10.5 to 11.7
Cobalt (Co), % 39 to 41
0
Iron (Fe), % 10 to 20.5
85.1 to 89.3
Manganese (Mn), % 1.5 to 2.5
0 to 1.0
Molybdenum (Mo), % 6.0 to 8.0
0
Nickel (Ni), % 14 to 16
0 to 0.5
Niobium (Nb), % 0
0.18 to 0.4
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0
0.050 to 0.2