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SAE-AISI H43 Steel vs. R30021 Cobalt

SAE-AISI H43 steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 20 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 SAE-AISI H43 steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 710 to 2140
700

Thermal Properties

Latent Heat of Fusion, J/g 270
330
Melting Completion (Liquidus), °C 1530
1350
Melting Onset (Solidus), °C 1480
1190
Specific Heat Capacity, J/kg-K 460
450
Thermal Conductivity, W/m-K 30
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 8.2
8.0
Embodied Energy, MJ/kg 120
110
Embodied Water, L/kg 100
520

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 75
23
Strength to Weight: Bending, points 22 to 46
21
Thermal Diffusivity, mm2/s 8.3
3.8
Thermal Shock Resistance, points 21 to 62
21

Alloy Composition

Carbon (C), % 0.5 to 0.65
0.2 to 0.35
Chromium (Cr), % 3.8 to 4.5
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 83.2 to 85.9
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 7.8 to 8.5
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.45
0 to 1.5
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 1.8 to 2.2
0