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G-CoCr28 Cobalt vs. EN 1.4945 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while EN 1.4945 stainless steel belongs to the iron alloys. They have a modest 37% 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 (6, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is EN 1.4945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 6.7
19 to 34
Fatigue Strength, MPa 130
230 to 350
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 560
640 to 740
Tensile Strength: Yield (Proof), MPa 260
290 to 550

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
920
Melting Completion (Liquidus), °C 1330
1490
Melting Onset (Solidus), °C 1270
1440
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
14
Thermal Expansion, µm/m-K 14
17

Otherwise Unclassified Properties

Base Metal Price, % relative 100
30
Density, g/cm3 8.1
8.1
Embodied Carbon, kg CO2/kg material 6.2
5.0
Embodied Energy, MJ/kg 84
73
Embodied Water, L/kg 440
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
130 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 160
210 to 760
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
22 to 25
Strength to Weight: Bending, points 19
20 to 22
Thermal Diffusivity, mm2/s 2.2
3.7
Thermal Shock Resistance, points 14
14 to 16

Alloy Composition

Carbon (C), % 0.050 to 0.25
0.040 to 0.1
Chromium (Cr), % 27 to 30
15.5 to 17.5
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
57.9 to 65.7
Manganese (Mn), % 0 to 1.5
0 to 1.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
15.5 to 17.5
Niobium (Nb), % 0 to 0.5
0.4 to 1.2
Nitrogen (N), % 0
0.060 to 0.14
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 0.015
Tungsten (W), % 0
2.5 to 3.5