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G-CoCr28 Cobalt vs. EN 1.4961 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while EN 1.4961 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 1.4961 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 6.7
39
Fatigue Strength, MPa 130
190
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
76
Tensile Strength: Ultimate (UTS), MPa 560
610
Tensile Strength: Yield (Proof), MPa 260
220

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
890
Melting Completion (Liquidus), °C 1330
1430
Melting Onset (Solidus), °C 1270
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 8.5
16
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 100
21
Density, g/cm3 8.1
7.9
Embodied Carbon, kg CO2/kg material 6.2
4.0
Embodied Energy, MJ/kg 84
57
Embodied Water, L/kg 440
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
190
Resilience: Unit (Modulus of Resilience), kJ/m3 160
120
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
22
Strength to Weight: Bending, points 19
20
Thermal Diffusivity, mm2/s 2.2
4.3
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 to 17
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
65.6 to 72.3
Manganese (Mn), % 0 to 1.5
0 to 1.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
12 to 14
Niobium (Nb), % 0 to 0.5
0.4 to 1.2
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