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R30605 Cobalt vs. ASTM Grade HD Steel

R30605 cobalt belongs to the cobalt alloys classification, while ASTM grade HD steel belongs to the iron alloys. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is ASTM grade HD steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
9.1
Fatigue Strength, MPa 260 to 590
140
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 81
80
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
590
Tensile Strength: Yield (Proof), MPa 470 to 1600
270

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Melting Completion (Liquidus), °C 1410
1410
Melting Onset (Solidus), °C 1330
1370
Specific Heat Capacity, J/kg-K 410
490
Thermal Conductivity, W/m-K 9.6
16
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.5

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.7
Embodied Carbon, kg CO2/kg material 9.8
3.1
Embodied Energy, MJ/kg 140
45
Embodied Water, L/kg 450
180

Common Calculations

Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 21
26
Strength to Weight: Axial, points 33 to 55
21
Strength to Weight: Bending, points 25 to 36
20
Thermal Diffusivity, mm2/s 2.5
4.3
Thermal Shock Resistance, points 31 to 52
19

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.5
Chromium (Cr), % 19 to 21
26 to 30
Cobalt (Co), % 46.4 to 57
0
Iron (Fe), % 0 to 3.0
58.4 to 70
Manganese (Mn), % 1.0 to 2.0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 9.0 to 11
4.0 to 7.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 14 to 16
0