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S42300 Stainless Steel vs. G-CoCr28 Cobalt

S42300 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S42300 stainless steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 9.1
6.7
Fatigue Strength, MPa 440
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 1100
560
Tensile Strength: Yield (Proof), MPa 850
260

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Maximum Temperature: Mechanical, °C 750
1200
Melting Completion (Liquidus), °C 1470
1330
Melting Onset (Solidus), °C 1420
1270
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 25
8.5
Thermal Expansion, µm/m-K 10
14

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
100
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 3.2
6.2
Embodied Energy, MJ/kg 44
84
Embodied Water, L/kg 110
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 93
31
Resilience: Unit (Modulus of Resilience), kJ/m3 1840
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 39
19
Strength to Weight: Bending, points 30
19
Thermal Diffusivity, mm2/s 6.8
2.2
Thermal Shock Resistance, points 40
14

Alloy Composition

Carbon (C), % 0.27 to 0.32
0.050 to 0.25
Chromium (Cr), % 11 to 12
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 82 to 85.1
9.7 to 24.5
Manganese (Mn), % 1.0 to 1.4
0 to 1.5
Molybdenum (Mo), % 2.5 to 3.0
0 to 0.5
Nickel (Ni), % 0 to 0.5
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0.5 to 1.5
Sulfur (S), % 0 to 0.025
0 to 0.030
Vanadium (V), % 0.2 to 0.3
0