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ASTM Grade HN Steel vs. R31537 Cobalt

ASTM grade HN steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. They have a modest 23% 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 (13, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HN steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 9.0
14 to 23
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
87
Tensile Strength: Ultimate (UTS), MPa 500
1000 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1400
1360
Melting Onset (Solidus), °C 1350
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 4.6
8.1
Embodied Energy, MJ/kg 66
110
Embodied Water, L/kg 180
530

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
33 to 44
Strength to Weight: Bending, points 18
26 to 32
Thermal Diffusivity, mm2/s 3.5
3.4
Thermal Shock Resistance, points 11
24 to 32

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.14
Chromium (Cr), % 19 to 23
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 44.9 to 57.8
0 to 0.75
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
5.0 to 7.0
Nickel (Ni), % 23 to 27
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0