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R30605 Cobalt vs. S46500 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while S46500 stainless steel belongs to the iron alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 R30605 cobalt and the bottom bar is S46500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
2.3 to 14
Fatigue Strength, MPa 260 to 590
550 to 890
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
1260 to 1930
Tensile Strength: Yield (Proof), MPa 470 to 1600
1120 to 1810

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1410
1450
Melting Onset (Solidus), °C 1330
1410
Specific Heat Capacity, J/kg-K 410
470
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.9
Embodied Carbon, kg CO2/kg material 9.8
3.6
Embodied Energy, MJ/kg 140
51
Embodied Water, L/kg 450
120

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
44 to 68
Strength to Weight: Bending, points 25 to 36
33 to 44
Thermal Shock Resistance, points 31 to 52
44 to 67

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.020
Chromium (Cr), % 19 to 21
11 to 12.5
Cobalt (Co), % 46.4 to 57
0
Iron (Fe), % 0 to 3.0
72.6 to 76.1
Manganese (Mn), % 1.0 to 2.0
0 to 0.25
Molybdenum (Mo), % 0
0.75 to 1.3
Nickel (Ni), % 9.0 to 11
10.7 to 11.3
Nitrogen (N), % 0
0 to 0.010
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 0.4
0 to 0.25
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
1.5 to 1.8
Tungsten (W), % 14 to 16
0

Comparable Variants