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R31538 Cobalt vs. S30601 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while S30601 stainless steel belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is S30601 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
37
Fatigue Strength, MPa 310 to 480
250
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 22
56
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
660
Tensile Strength: Yield (Proof), MPa 580 to 930
300

Thermal Properties

Latent Heat of Fusion, J/g 320
370
Melting Completion (Liquidus), °C 1360
1360
Melting Onset (Solidus), °C 1290
1310
Specific Heat Capacity, J/kg-K 450
500
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.6
Embodied Carbon, kg CO2/kg material 8.1
3.9
Embodied Energy, MJ/kg 110
55
Embodied Water, L/kg 530
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
200
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
230
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
24
Strength to Weight: Bending, points 27 to 32
22
Thermal Shock Resistance, points 25 to 33
16

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.015
Chromium (Cr), % 26 to 30
17 to 18
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 0 to 0.75
56.9 to 60.5
Manganese (Mn), % 0 to 1.0
0.5 to 0.8
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.2
Nickel (Ni), % 0 to 1.0
17 to 18
Nitrogen (N), % 0 to 0.25
0 to 0.050
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
5.0 to 5.6
Sulfur (S), % 0
0 to 0.013