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R30012 Cobalt vs. ASTM Grade HD Steel

R30012 cobalt belongs to the cobalt alloys classification, while ASTM grade HD steel belongs to the iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 R30012 cobalt and the bottom bar is ASTM grade HD steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
9.1
Fatigue Strength, MPa 320
140
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 830
590
Tensile Strength: Yield (Proof), MPa 650
270

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1470
1410
Melting Onset (Solidus), °C 1280
1370
Specific Heat Capacity, J/kg-K 440
490
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 12
11

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.7
Embodied Carbon, kg CO2/kg material 8.3
3.1
Embodied Energy, MJ/kg 120
45
Embodied Water, L/kg 480
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
44
Resilience: Unit (Modulus of Resilience), kJ/m3 960
180
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 23
26
Strength to Weight: Axial, points 26
21
Strength to Weight: Bending, points 22
20
Thermal Diffusivity, mm2/s 3.8
4.3
Thermal Shock Resistance, points 23
19

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.5
Chromium (Cr), % 27 to 32
26 to 30
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
58.4 to 70
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
0 to 0.5
Nickel (Ni), % 0 to 3.0
4.0 to 7.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Tungsten (W), % 7.5 to 9.5
0