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S44735 Stainless Steel vs. R30816 Cobalt

S44735 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 29% 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 (9, in this case) are not shown.

For each property being compared, the top bar is S44735 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
280
Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 21
23
Fatigue Strength, MPa 300
250
Poisson's Ratio 0.27
0.3
Shear Modulus, GPa 82
81
Tensile Strength: Ultimate (UTS), MPa 630
1020
Tensile Strength: Yield (Proof), MPa 460
460

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1420
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.1
Embodied Carbon, kg CO2/kg material 4.4
20
Embodied Energy, MJ/kg 61
320
Embodied Water, L/kg 180
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
190
Resilience: Unit (Modulus of Resilience), kJ/m3 520
510
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 26
22
Strength to Weight: Axial, points 23
31
Strength to Weight: Bending, points 21
25
Thermal Shock Resistance, points 20
28

Alloy Composition

Carbon (C), % 0 to 0.030
0.32 to 0.42
Chromium (Cr), % 28 to 30
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 60.7 to 68.4
0 to 5.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 3.6 to 4.2
3.5 to 4.5
Nickel (Ni), % 0 to 1.0
19 to 21
Niobium (Nb), % 0.2 to 1.0
3.5 to 4.5
Nitrogen (N), % 0 to 0.045
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Titanium (Ti), % 0.2 to 1.0
0
Tungsten (W), % 0
3.5 to 4.5