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R30001 Cobalt vs. ASTM Grade HN Steel

R30001 cobalt belongs to the cobalt alloys classification, while ASTM grade HN steel belongs to the iron alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 R30001 cobalt and the bottom bar is ASTM grade HN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
9.0
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 620
500

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Melting Completion (Liquidus), °C 1530
1400
Melting Onset (Solidus), °C 1260
1350
Specific Heat Capacity, J/kg-K 430
480
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 9.0
7.9
Embodied Carbon, kg CO2/kg material 8.9
4.6
Embodied Energy, MJ/kg 130
66
Embodied Water, L/kg 460
180

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 19
17
Strength to Weight: Bending, points 18
18
Thermal Diffusivity, mm2/s 3.7
3.5
Thermal Shock Resistance, points 19
11

Alloy Composition

Carbon (C), % 2.0 to 3.0
0.2 to 0.5
Chromium (Cr), % 28 to 32
19 to 23
Cobalt (Co), % 43 to 59
0
Iron (Fe), % 0 to 3.0
44.9 to 57.8
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 1.0
0 to 0.5
Nickel (Ni), % 0 to 3.0
23 to 27
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), % 11 to 13
0