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G-CoCr28 Cobalt vs. EN 1.4818 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while EN 1.4818 stainless steel belongs to the iron alloys. They have a modest 40% 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 1.4818 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
280
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 560
700
Tensile Strength: Yield (Proof), MPa 260
330

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Maximum Temperature: Mechanical, °C 1200
1050
Melting Completion (Liquidus), °C 1330
1410
Melting Onset (Solidus), °C 1270
1370
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 8.5
17
Thermal Expansion, µm/m-K 14
17

Otherwise Unclassified Properties

Base Metal Price, % relative 100
16
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 6.2
3.1
Embodied Energy, MJ/kg 84
44
Embodied Water, L/kg 440
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
230
Resilience: Unit (Modulus of Resilience), kJ/m3 160
270
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
25
Strength to Weight: Bending, points 19
23
Thermal Diffusivity, mm2/s 2.2
4.5
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0.050 to 0.25
0.040 to 0.080
Cerium (Ce), % 0
0.030 to 0.080
Chromium (Cr), % 27 to 30
18 to 20
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
65.6 to 71.8
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
9.0 to 11
Niobium (Nb), % 0 to 0.5
0
Nitrogen (N), % 0
0.12 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0.5 to 1.5
1.0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.015