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G-CoCr28 Cobalt vs. EN 1.4306 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while EN 1.4306 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 (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 1.4306 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 6.7
14 to 45
Fatigue Strength, MPa 130
190 to 330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 560
580 to 900
Tensile Strength: Yield (Proof), MPa 260
210 to 570

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
960
Melting Completion (Liquidus), °C 1330
1420
Melting Onset (Solidus), °C 1270
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 8.5
15
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 100
16
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.2
3.2
Embodied Energy, MJ/kg 84
45
Embodied Water, L/kg 440
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
110 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 160
110 to 820
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
21 to 32
Strength to Weight: Bending, points 19
20 to 27
Thermal Diffusivity, mm2/s 2.2
4.0
Thermal Shock Resistance, points 14
13 to 20

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.030
Chromium (Cr), % 27 to 30
18 to 20
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
64.8 to 72
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
10 to 12
Niobium (Nb), % 0 to 0.5
0
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015