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R31538 Cobalt vs. ASTM Grade HI Steel

R31538 cobalt belongs to the cobalt alloys classification, while ASTM grade HI steel belongs to the iron alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 23
11
Fatigue Strength, MPa 310 to 480
150
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
550
Tensile Strength: Yield (Proof), MPa 580 to 930
270

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1290
1350
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.4

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
4.1
Embodied Energy, MJ/kg 110
59
Embodied Water, L/kg 530
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
52
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
180
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
20
Strength to Weight: Bending, points 27 to 32
19
Thermal Diffusivity, mm2/s 3.5
3.9
Thermal Shock Resistance, points 25 to 33
12

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.2 to 0.5
Chromium (Cr), % 26 to 30
26 to 30
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
46.9 to 59.8
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.5
Nickel (Ni), % 0 to 1.0
14 to 18
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0
0 to 0.040