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R30605 Cobalt vs. ASTM Grade HP Steel

R30605 cobalt belongs to the cobalt alloys classification, while ASTM grade HP 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 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
5.1
Fatigue Strength, MPa 260 to 590
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
78
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
490
Tensile Strength: Yield (Proof), MPa 470 to 1600
260

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1410
1370
Melting Onset (Solidus), °C 1330
1330
Specific Heat Capacity, J/kg-K 410
480
Thermal Conductivity, W/m-K 9.6
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.9
Embodied Carbon, kg CO2/kg material 9.8
5.8
Embodied Energy, MJ/kg 140
82
Embodied Water, L/kg 450
220

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
17
Strength to Weight: Bending, points 25 to 36
17
Thermal Diffusivity, mm2/s 2.5
3.2
Thermal Shock Resistance, points 31 to 52
11

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.35 to 0.75
Chromium (Cr), % 19 to 21
24 to 28
Cobalt (Co), % 46.4 to 57
0
Iron (Fe), % 0 to 3.0
29.2 to 42.7
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 9.0 to 11
33 to 37
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 2.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 14 to 16
0