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SAE-AISI H11 Steel vs. R31538 Cobalt

SAE-AISI H11 steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H11 steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
86
Tensile Strength: Ultimate (UTS), MPa 690 to 1840
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 42
13
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.0
8.1
Embodied Energy, MJ/kg 43
110
Embodied Water, L/kg 75
530

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 66
34 to 45
Strength to Weight: Bending, points 22 to 43
27 to 32
Thermal Diffusivity, mm2/s 11
3.5
Thermal Shock Resistance, points 22 to 58
25 to 33

Alloy Composition

Carbon (C), % 0.33 to 0.43
0.15 to 0.35
Chromium (Cr), % 4.8 to 5.5
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 89.6 to 92.5
0 to 0.75
Manganese (Mn), % 0.2 to 0.5
0 to 1.0
Molybdenum (Mo), % 1.1 to 1.6
5.0 to 7.0
Nickel (Ni), % 0 to 0.3
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.8 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.3 to 0.6
0

Comparable Variants