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G-CoCr28 Cobalt vs. AISI 304 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while AISI 304 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 (7, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is AISI 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 6.7
8.0 to 43
Fatigue Strength, MPa 130
210 to 440
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 560
580 to 1180
Tensile Strength: Yield (Proof), MPa 260
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
710
Melting Completion (Liquidus), °C 1330
1450
Melting Onset (Solidus), °C 1270
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 8.5
16
Thermal Expansion, µm/m-K 14
17

Otherwise Unclassified Properties

Base Metal Price, % relative 100
15
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.2
3.0
Embodied Energy, MJ/kg 84
43
Embodied Water, L/kg 440
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 160
140 to 1870
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
21 to 42
Strength to Weight: Bending, points 19
20 to 32
Thermal Diffusivity, mm2/s 2.2
4.2
Thermal Shock Resistance, points 14
12 to 25

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.080
Chromium (Cr), % 27 to 30
18 to 20
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
66.5 to 74
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
8.0 to 10.5
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 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030