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R30155 Cobalt vs. Grade VDSiCrV Steel

Both R30155 cobalt and grade VDSiCrV steel are iron alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is grade VDSiCrV steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
630
Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34
48
Shear Modulus, GPa 81
80
Tensile Strength: Ultimate (UTS), MPa 850
2100

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
47
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
2.3
Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 9.7
1.9
Embodied Energy, MJ/kg 150
26
Embodied Water, L/kg 300
50

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
75
Strength to Weight: Bending, points 24
47
Thermal Diffusivity, mm2/s 3.2
13
Thermal Shock Resistance, points 21
63

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.5 to 0.7
Chromium (Cr), % 20 to 22.5
0.5 to 1.0
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.060
Iron (Fe), % 24.3 to 36.2
96.1 to 97.8
Manganese (Mn), % 1.0 to 2.0
0.4 to 0.9
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
1.2 to 1.7
Sulfur (S), % 0 to 0.030
0 to 0.020
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0
Vanadium (V), % 0
0.1 to 0.25