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ACI-ASTM CH20 Steel vs. R30003 Cobalt

ACI-ASTM CH20 steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have 50% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CH20 steel and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 38
10 to 73
Fatigue Strength, MPa 290
320 to 560
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 78
83
Tensile Strength: Ultimate (UTS), MPa 610
970 to 1720
Tensile Strength: Yield (Proof), MPa 350
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Melting Completion (Liquidus), °C 1410
1400
Melting Onset (Solidus), °C 1430
1440
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 14
13
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 20
95
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.7
8.0
Embodied Energy, MJ/kg 53
110
Embodied Water, L/kg 180
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 300
600 to 2790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
32 to 57
Strength to Weight: Bending, points 21
26 to 38
Thermal Diffusivity, mm2/s 3.7
3.3
Thermal Shock Resistance, points 15
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.2
0 to 0.15
Chromium (Cr), % 22 to 26
19 to 21
Cobalt (Co), % 0
39 to 41
Iron (Fe), % 54.7 to 66
10 to 20.5
Manganese (Mn), % 0 to 1.5
1.5 to 2.5
Molybdenum (Mo), % 0 to 0.5
6.0 to 8.0
Nickel (Ni), % 12 to 15
14 to 16
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 2.0
0 to 1.2
Sulfur (S), % 0 to 0.040
0 to 0.015