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S46910 Stainless Steel vs. R30605 Cobalt

S46910 stainless steel belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. They have a modest 23% 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 (13, in this case) are not shown.

For each property being compared, the top bar is S46910 stainless steel and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 2.2 to 11
34
Fatigue Strength, MPa 250 to 1020
260 to 590
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 680 to 2470
1130 to 1900
Tensile Strength: Yield (Proof), MPa 450 to 2290
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1460
1410
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
410
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.9
9.6
Embodied Carbon, kg CO2/kg material 4.1
9.8
Embodied Energy, MJ/kg 55
140
Embodied Water, L/kg 140
450

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 24 to 86
33 to 55
Strength to Weight: Bending, points 22 to 51
25 to 36
Thermal Shock Resistance, points 23 to 84
31 to 52

Alloy Composition

Aluminum (Al), % 0.15 to 0.5
0
Carbon (C), % 0 to 0.030
0.050 to 0.15
Chromium (Cr), % 11 to 13
19 to 21
Cobalt (Co), % 0
46.4 to 57
Copper (Cu), % 1.5 to 3.5
0
Iron (Fe), % 65 to 76
0 to 3.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 3.0 to 5.0
0
Nickel (Ni), % 8.0 to 10
9.0 to 11
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.7
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0.5 to 1.2
0
Tungsten (W), % 0
14 to 16

Comparable Variants