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R30001 Cobalt vs. SAE-AISI A4 Steel

R30001 cobalt belongs to the cobalt alloys classification, while SAE-AISI A4 steel belongs to the iron alloys. There are 22 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 R30001 cobalt and the bottom bar is SAE-AISI A4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 620
710 to 2050

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1530
1450
Melting Onset (Solidus), °C 1260
1410
Specific Heat Capacity, J/kg-K 430
470
Thermal Conductivity, W/m-K 15
40
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.6

Otherwise Unclassified Properties

Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 8.9
1.8
Embodied Energy, MJ/kg 130
24
Embodied Water, L/kg 460
59

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 19
25 to 73
Strength to Weight: Bending, points 18
23 to 46
Thermal Diffusivity, mm2/s 3.7
11
Thermal Shock Resistance, points 19
23 to 67

Alloy Composition

Carbon (C), % 2.0 to 3.0
1.0 to 1.1
Chromium (Cr), % 28 to 32
0.9 to 2.2
Cobalt (Co), % 43 to 59
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
92 to 95.5
Manganese (Mn), % 0
1.8 to 2.2
Molybdenum (Mo), % 0 to 1.0
0.9 to 1.4
Nickel (Ni), % 0 to 3.0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 11 to 13
0