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Grade VDC Steel vs. R30003 Cobalt

Grade VDC steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. There are 23 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 grade VDC steel and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 80
83
Tensile Strength: Ultimate (UTS), MPa 1700
970 to 1720

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1410
1440
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 51
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
95
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.4
8.0
Embodied Energy, MJ/kg 19
110
Embodied Water, L/kg 47
400

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 60
32 to 57
Strength to Weight: Bending, points 40
26 to 38
Thermal Diffusivity, mm2/s 14
3.3
Thermal Shock Resistance, points 50
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0.6 to 0.75
0 to 0.15
Chromium (Cr), % 0 to 0.3
19 to 21
Cobalt (Co), % 0
39 to 41
Copper (Cu), % 0 to 0.060
0
Iron (Fe), % 98.3 to 99.35
10 to 20.5
Manganese (Mn), % 0.5 to 1.0
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0
14 to 16
Phosphorus (P), % 0 to 0.020
0 to 0.015
Silicon (Si), % 0.15 to 0.3
0 to 1.2
Sulfur (S), % 0 to 0.020
0 to 0.015