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ASTM Grade HN Steel vs. R30021 Cobalt

ASTM grade HN steel belongs to the iron alloys classification, while R30021 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 (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 R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 9.0
9.0
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 500
700

Thermal Properties

Latent Heat of Fusion, J/g 310
330
Melting Completion (Liquidus), °C 1400
1350
Melting Onset (Solidus), °C 1350
1190
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
8.4
Embodied Carbon, kg CO2/kg material 4.6
8.0
Embodied Energy, MJ/kg 66
110
Embodied Water, L/kg 180
520

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
23
Strength to Weight: Bending, points 18
21
Thermal Diffusivity, mm2/s 3.5
3.8
Thermal Shock Resistance, points 11
21

Alloy Composition

Carbon (C), % 0.2 to 0.5
0.2 to 0.35
Chromium (Cr), % 19 to 23
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 44.9 to 57.8
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0 to 0.5
4.5 to 6.0
Nickel (Ni), % 23 to 27
2.0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 1.5
Sulfur (S), % 0 to 0.040
0