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EN 1.4123 Stainless Steel vs. G-CoCr28 Cobalt

EN 1.4123 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is EN 1.4123 stainless steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 720 to 810
560

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Maximum Temperature: Mechanical, °C 840
1200
Melting Completion (Liquidus), °C 1450
1330
Melting Onset (Solidus), °C 1410
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 23
8.5
Thermal Expansion, µm/m-K 10
14

Otherwise Unclassified Properties

Base Metal Price, % relative 10
100
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 4.2
6.2
Embodied Energy, MJ/kg 62
84
Embodied Water, L/kg 120
440

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26 to 29
19
Strength to Weight: Bending, points 23 to 25
19
Thermal Diffusivity, mm2/s 6.3
2.2
Thermal Shock Resistance, points 26 to 29
14

Alloy Composition

Carbon (C), % 0.35 to 0.5
0.050 to 0.25
Chromium (Cr), % 14 to 16.5
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 76.7 to 84.6
9.7 to 24.5
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 1.0 to 2.5
0 to 0.5
Nickel (Ni), % 0 to 0.5
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0.1 to 0.3
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0 to 1.5
0