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R31233 Cobalt vs. ASTM Grade HN Steel

R31233 cobalt belongs to the cobalt alloys classification, while ASTM grade HN steel belongs to the iron alloys. They have a modest 35% 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 (11, in this case) are not shown.

For each property being compared, the top bar is R31233 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, % 17
9.0
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1020
500

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1350
1400
Melting Onset (Solidus), °C 1330
1350
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 12
13
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.9
Embodied Carbon, kg CO2/kg material 8.4
4.6
Embodied Energy, MJ/kg 110
66
Embodied Water, L/kg 480
180

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
17
Strength to Weight: Bending, points 26
18
Thermal Diffusivity, mm2/s 3.2
3.5
Thermal Shock Resistance, points 25
11

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0.2 to 0.5
Chromium (Cr), % 23.5 to 27.5
19 to 23
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
44.9 to 57.8
Manganese (Mn), % 0.1 to 1.5
0 to 2.0
Molybdenum (Mo), % 4.0 to 6.0
0 to 0.5
Nickel (Ni), % 7.0 to 11
23 to 27
Nitrogen (N), % 0.030 to 0.12
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.050 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.020
0 to 0.040
Tungsten (W), % 1.0 to 3.0
0