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ASTM Grade HH Steel vs. R31538 Cobalt

ASTM grade HH steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. They have a modest 28% 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 ASTM grade HH steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1400
1360
Melting Onset (Solidus), °C 1360
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 14
13
Thermal Expansion, µm/m-K 17
13

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 3.7
8.1
Embodied Energy, MJ/kg 53
110
Embodied Water, L/kg 180
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 53
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 190
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
34 to 45
Strength to Weight: Bending, points 20
27 to 32
Thermal Diffusivity, mm2/s 3.8
3.5
Thermal Shock Resistance, points 12
25 to 33

Alloy Composition

Carbon (C), % 0.2 to 0.5
0.15 to 0.35
Chromium (Cr), % 24 to 28
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Iron (Fe), % 52.9 to 64.8
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), % 11 to 14
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