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S44800 Stainless Steel vs. R30035 Cobalt

S44800 stainless steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S44800 stainless steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220 to 230
Elongation at Break, % 23
9.0 to 46
Fatigue Strength, MPa 300
170 to 740
Poisson's Ratio 0.27
0.29
Reduction in Area, % 45
40 to 74
Shear Modulus, GPa 82
84 to 89
Tensile Strength: Ultimate (UTS), MPa 590
900 to 1900
Tensile Strength: Yield (Proof), MPa 450
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1410
1320
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 17
11
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 19
100
Density, g/cm3 7.8
8.7
Embodied Carbon, kg CO2/kg material 3.8
10
Embodied Energy, MJ/kg 52
140
Embodied Water, L/kg 190
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 480
210 to 5920
Stiffness to Weight: Axial, points 15
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 21
29 to 61
Strength to Weight: Bending, points 20
24 to 39
Thermal Diffusivity, mm2/s 4.6
3.0
Thermal Shock Resistance, points 19
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.010
0 to 0.025
Chromium (Cr), % 28 to 30
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 62.6 to 66.5
0 to 1.0
Manganese (Mn), % 0 to 0.3
0 to 0.15
Molybdenum (Mo), % 3.5 to 4.2
9.0 to 10.5
Nickel (Ni), % 2.0 to 2.5
33 to 37
Nitrogen (N), % 0 to 0.020
0
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0 to 0.2
0 to 0.15
Sulfur (S), % 0 to 0.020
0 to 0.010
Titanium (Ti), % 0
0 to 1.0