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G-CoCr28 Cobalt vs. EN 1.4374 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while EN 1.4374 stainless steel belongs to the iron alloys. They have a modest 39% 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 (7, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is EN 1.4374 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 6.7
40
Fatigue Strength, MPa 130
340
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 560
800
Tensile Strength: Yield (Proof), MPa 260
400

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
920
Melting Completion (Liquidus), °C 1330
1400
Melting Onset (Solidus), °C 1270
1360
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 8.5
15
Thermal Expansion, µm/m-K 14
17

Otherwise Unclassified Properties

Base Metal Price, % relative 100
14
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 6.2
2.9
Embodied Energy, MJ/kg 84
42
Embodied Water, L/kg 440
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
270
Resilience: Unit (Modulus of Resilience), kJ/m3 160
400
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
29
Strength to Weight: Bending, points 19
25
Thermal Diffusivity, mm2/s 2.2
4.0
Thermal Shock Resistance, points 14
17

Alloy Composition

Carbon (C), % 0.050 to 0.25
0.050 to 0.1
Chromium (Cr), % 27 to 30
17.5 to 18.5
Cobalt (Co), % 48 to 52
0
Copper (Cu), % 0
0 to 0.4
Iron (Fe), % 9.7 to 24.5
63.5 to 67.9
Manganese (Mn), % 0 to 1.5
9.0 to 10
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 0 to 4.0
5.0 to 6.0
Niobium (Nb), % 0 to 0.5
0
Nitrogen (N), % 0
0.25 to 0.32
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0.5 to 1.5
0.3 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030