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S44725 Stainless Steel vs. R30816 Cobalt

S44725 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 S44725 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
280
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 22
23
Fatigue Strength, MPa 210
250
Poisson's Ratio 0.27
0.3
Shear Modulus, GPa 81
81
Tensile Strength: Ultimate (UTS), MPa 500
1020
Tensile Strength: Yield (Proof), MPa 310
460

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1450
1540
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 17
13
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.1
Embodied Carbon, kg CO2/kg material 3.1
20
Embodied Energy, MJ/kg 44
320
Embodied Water, L/kg 170
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
190
Resilience: Unit (Modulus of Resilience), kJ/m3 240
510
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 18
31
Strength to Weight: Bending, points 18
25
Thermal Diffusivity, mm2/s 4.6
3.3
Thermal Shock Resistance, points 16
28

Alloy Composition

Carbon (C), % 0 to 0.015
0.32 to 0.42
Chromium (Cr), % 25 to 28.5
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 67.6 to 73.5
0 to 5.0
Manganese (Mn), % 0 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 1.5 to 2.5
3.5 to 4.5
Nickel (Ni), % 0 to 0.3
19 to 21
Niobium (Nb), % 0 to 0.26
3.5 to 4.5
Nitrogen (N), % 0 to 0.018
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.040
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Titanium (Ti), % 0 to 0.26
0
Tungsten (W), % 0
3.5 to 4.5