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R31539 Cobalt vs. S46910 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while S46910 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 R31539 cobalt and the bottom bar is S46910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
2.2 to 11
Fatigue Strength, MPa 310 to 480
250 to 1020
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 25 to 35
29 to 63
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
680 to 2470
Tensile Strength: Yield (Proof), MPa 590 to 940
450 to 2290

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.2
4.1
Embodied Energy, MJ/kg 110
55
Embodied Water, L/kg 530
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
48 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
510 to 4780
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 44
24 to 86
Strength to Weight: Bending, points 27 to 32
22 to 51
Thermal Shock Resistance, points 24 to 32
23 to 84

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0.15 to 0.5
Carbon (C), % 0 to 0.14
0 to 0.030
Chromium (Cr), % 26 to 30
11 to 13
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
1.5 to 3.5
Iron (Fe), % 0 to 0.75
65 to 76
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
3.0 to 5.0
Nickel (Ni), % 0 to 1.0
8.0 to 10
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.7
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
0.5 to 1.2

Comparable Variants