MakeItFrom.com
Menu (ESC)

G-CoCr28 Cobalt vs. SAE-AISI P21 Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while SAE-AISI P21 steel belongs to the iron alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is SAE-AISI P21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 83
73
Tensile Strength: Ultimate (UTS), MPa 560
1130

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1330
1450
Melting Onset (Solidus), °C 1270
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
41
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Base Metal Price, % relative 100
6.5
Density, g/cm3 8.1
7.9
Embodied Carbon, kg CO2/kg material 6.2
2.3
Embodied Energy, MJ/kg 84
32
Embodied Water, L/kg 440
62

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
40
Strength to Weight: Bending, points 19
31
Thermal Diffusivity, mm2/s 2.2
11
Thermal Shock Resistance, points 14
37

Alloy Composition

Carbon (C), % 0.050 to 0.25
0.18 to 0.22
Chromium (Cr), % 27 to 30
0 to 0.5
Cobalt (Co), % 48 to 52
1.1 to 1.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 9.7 to 24.5
92.1 to 94.2
Manganese (Mn), % 0 to 1.5
0.35 to 0.72
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
3.9 to 4.3
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0.5 to 1.5
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.15 to 0.25