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S44735 Stainless Steel vs. R30016 Cobalt

S44735 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. They have a modest 33% 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 (14, in this case) are not shown.

For each property being compared, the top bar is S44735 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 21
8.4
Fatigue Strength, MPa 300
290
Poisson's Ratio 0.27
0.28
Rockwell C Hardness 22
37
Shear Modulus, GPa 82
85
Tensile Strength: Ultimate (UTS), MPa 630
1010
Tensile Strength: Yield (Proof), MPa 460
580

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1420
1270
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 4.4
7.7
Embodied Energy, MJ/kg 61
110
Embodied Water, L/kg 180
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
72
Resilience: Unit (Modulus of Resilience), kJ/m3 520
770
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 23
33
Strength to Weight: Bending, points 21
26
Thermal Shock Resistance, points 20
24

Alloy Composition

Carbon (C), % 0 to 0.030
0.9 to 1.4
Chromium (Cr), % 28 to 30
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 60.7 to 68.4
0 to 3.0
Manganese (Mn), % 0 to 1.0
0.5 to 2.0
Molybdenum (Mo), % 3.6 to 4.2
0 to 1.5
Nickel (Ni), % 0 to 1.0
0 to 3.0
Niobium (Nb), % 0.2 to 1.0
0
Nitrogen (N), % 0 to 0.045
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0.2 to 1.0
0
Tungsten (W), % 0
3.5 to 5.5