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R30035 Cobalt vs. S45500 Stainless Steel

R30035 cobalt belongs to the cobalt alloys classification, while S45500 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 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 R30035 cobalt and the bottom bar is S45500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220 to 230
190
Elongation at Break, % 9.0 to 46
3.4 to 11
Fatigue Strength, MPa 170 to 740
570 to 890
Poisson's Ratio 0.29
0.28
Reduction in Area, % 40 to 74
34 to 45
Shear Modulus, GPa 84 to 89
75
Tensile Strength: Ultimate (UTS), MPa 900 to 1900
1370 to 1850
Tensile Strength: Yield (Proof), MPa 300 to 1650
1240 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1320
1400
Specific Heat Capacity, J/kg-K 440
470
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 100
17
Density, g/cm3 8.7
7.9
Embodied Carbon, kg CO2/kg material 10
3.8
Embodied Energy, MJ/kg 140
57
Embodied Water, L/kg 410
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 320
45 to 190
Stiffness to Weight: Axial, points 14 to 15
14
Stiffness to Weight: Bending, points 23 to 24
24
Strength to Weight: Axial, points 29 to 61
48 to 65
Strength to Weight: Bending, points 24 to 39
35 to 42
Thermal Shock Resistance, points 23 to 46
48 to 64

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0 to 0.025
0 to 0.050
Chromium (Cr), % 19 to 21
11 to 12.5
Cobalt (Co), % 29.1 to 39
0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 0 to 1.0
71.5 to 79.2
Manganese (Mn), % 0 to 0.15
0 to 0.5
Molybdenum (Mo), % 9.0 to 10.5
0 to 0.5
Nickel (Ni), % 33 to 37
7.5 to 9.5
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.15
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.030
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0 to 1.0
0.8 to 1.4

Comparable Variants