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S44735 Stainless Steel vs. R30021 Cobalt

S44735 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 34% 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 S44735 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 21
9.0
Fatigue Strength, MPa 300
250
Poisson's Ratio 0.27
0.29
Rockwell C Hardness 22
32
Shear Modulus, GPa 82
86
Tensile Strength: Ultimate (UTS), MPa 630
700
Tensile Strength: Yield (Proof), MPa 460
500

Thermal Properties

Latent Heat of Fusion, J/g 310
330
Melting Completion (Liquidus), °C 1460
1350
Melting Onset (Solidus), °C 1420
1190
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 4.4
8.0
Embodied Energy, MJ/kg 61
110
Embodied Water, L/kg 180
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
57
Resilience: Unit (Modulus of Resilience), kJ/m3 520
570
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 23
23
Strength to Weight: Bending, points 21
21
Thermal Shock Resistance, points 20
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.2 to 0.35
Chromium (Cr), % 28 to 30
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 60.7 to 68.4
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 3.6 to 4.2
4.5 to 6.0
Nickel (Ni), % 0 to 1.0
2.0 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 to 1.5
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0.2 to 1.0
0