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G-CoCr28 Cobalt vs. EN 1.4988 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while EN 1.4988 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 1.4988 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
920
Melting Completion (Liquidus), °C 1330
1450
Melting Onset (Solidus), °C 1270
1400
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
15
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 100
23
Density, g/cm3 8.1
7.9
Embodied Carbon, kg CO2/kg material 6.2
6.0
Embodied Energy, MJ/kg 84
89
Embodied Water, L/kg 440
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
180
Resilience: Unit (Modulus of Resilience), kJ/m3 160
210
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
23
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 2.2
4.0
Thermal Shock Resistance, points 14
14

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
62.1 to 69.5
Manganese (Mn), % 0 to 1.5
0 to 1.5
Molybdenum (Mo), % 0 to 0.5
1.1 to 1.5
Nickel (Ni), % 0 to 4.0
12.5 to 14.5
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
Vanadium (V), % 0
0.6 to 0.85