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R30008 Cobalt vs. S31730 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while S31730 stainless steel belongs to the iron alloys. They have 53% of their average alloy composition in common. There are 23 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 R30008 cobalt and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 1.1 to 73
40
Fatigue Strength, MPa 320 to 530
170
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
540
Tensile Strength: Yield (Proof), MPa 500 to 1080
200

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1330
1390
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 95
24
Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.1
4.6
Embodied Energy, MJ/kg 110
63
Embodied Water, L/kg 400
180

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
99
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 31 to 56
19
Strength to Weight: Bending, points 25 to 37
18
Thermal Shock Resistance, points 25 to 44
12

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.030
Chromium (Cr), % 18.5 to 21.5
17 to 19
Cobalt (Co), % 39 to 42
0
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 7.6 to 20
52.4 to 61
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 6.5 to 7.5
3.0 to 4.0
Nickel (Ni), % 15 to 18
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
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 0.010