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R30155 Cobalt vs. ACI-ASTM CK20 Steel

Both R30155 cobalt and ACI-ASTM CK20 steel are iron alloys. They have 73% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is ACI-ASTM CK20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
150
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
37
Fatigue Strength, MPa 310
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
78
Tensile Strength: Ultimate (UTS), MPa 850
530
Tensile Strength: Yield (Proof), MPa 390
260

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Maximum Temperature: Corrosion, °C 570
440
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
14
Thermal Expansion, µm/m-K 14
15

Otherwise Unclassified Properties

Base Metal Price, % relative 80
25
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
4.4
Embodied Energy, MJ/kg 150
62
Embodied Water, L/kg 300
190

Common Calculations

PREN (Pitting Resistance) 37
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
160
Resilience: Unit (Modulus of Resilience), kJ/m3 370
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
19
Strength to Weight: Bending, points 24
19
Thermal Diffusivity, mm2/s 3.2
3.7
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.2
Chromium (Cr), % 20 to 22.5
23 to 27
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
46.7 to 58
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.5
0 to 0.5
Nickel (Ni), % 19 to 21
19 to 22
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0