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S20910 Stainless Steel vs. R30012 Cobalt

S20910 stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 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 S20910 stainless steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 14 to 39
1.0
Fatigue Strength, MPa 310 to 460
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
86
Tensile Strength: Ultimate (UTS), MPa 780 to 940
830
Tensile Strength: Yield (Proof), MPa 430 to 810
650

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.8
Embodied Carbon, kg CO2/kg material 4.8
8.3
Embodied Energy, MJ/kg 68
120
Embodied Water, L/kg 180
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 260
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 1640
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 28 to 33
26
Strength to Weight: Bending, points 24 to 27
22
Thermal Diffusivity, mm2/s 3.6
3.8
Thermal Shock Resistance, points 17 to 21
23

Alloy Composition

Carbon (C), % 0 to 0.060
1.4 to 2.0
Chromium (Cr), % 20.5 to 23.5
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 52.1 to 62.1
0 to 3.0
Manganese (Mn), % 4.0 to 6.0
0
Molybdenum (Mo), % 1.5 to 3.0
0 to 1.0
Nickel (Ni), % 11.5 to 13.5
0 to 3.0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.75
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5
Vanadium (V), % 0.1 to 0.3
0