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ASTM Grade HN Steel vs. R30006 Cobalt

ASTM grade HN steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt 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 (14, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HN steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 9.0
1.0
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 500
900

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1400
1400
Melting Onset (Solidus), °C 1350
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.6
Embodied Carbon, kg CO2/kg material 4.6
7.8
Embodied Energy, MJ/kg 66
110
Embodied Water, L/kg 180
500

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 17
29
Strength to Weight: Bending, points 18
24
Thermal Diffusivity, mm2/s 3.5
3.9
Thermal Shock Resistance, points 11
26

Alloy Composition

Carbon (C), % 0.2 to 0.5
0.9 to 1.4
Chromium (Cr), % 19 to 23
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 44.9 to 57.8
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0 to 0.5
0 to 1.0
Nickel (Ni), % 23 to 27
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 2.0
Sulfur (S), % 0 to 0.040
0
Tungsten (W), % 0
4.0 to 6.0