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R30006 Cobalt vs. S31730 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S31730 stainless steel belongs to the iron alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
40
Fatigue Strength, MPa 260
170
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 900
540
Tensile Strength: Yield (Proof), MPa 540
200

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1290
1390
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.0
Embodied Carbon, kg CO2/kg material 7.8
4.6
Embodied Energy, MJ/kg 110
63
Embodied Water, L/kg 500
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
170
Resilience: Unit (Modulus of Resilience), kJ/m3 670
99
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 29
19
Strength to Weight: Bending, points 24
18
Thermal Shock Resistance, points 26
12

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.030
Chromium (Cr), % 27 to 32
17 to 19
Cobalt (Co), % 48.6 to 68.1
0
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 0 to 3.0
52.4 to 61
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 1.0
3.0 to 4.0
Nickel (Ni), % 0 to 3.0
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Tungsten (W), % 4.0 to 6.0
0