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SAE-AISI H42 Steel vs. R30021 Cobalt

SAE-AISI H42 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 H42 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 700 to 1980
700

Thermal Properties

Latent Heat of Fusion, J/g 260
330
Melting Completion (Liquidus), °C 1620
1350
Melting Onset (Solidus), °C 1570
1190
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 24
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.8
8.0
Embodied Energy, MJ/kg 130
110
Embodied Water, L/kg 98
520

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 23 to 65
23
Strength to Weight: Bending, points 21 to 42
21
Thermal Diffusivity, mm2/s 6.5
3.8
Thermal Shock Resistance, points 20 to 57
21

Alloy Composition

Carbon (C), % 0.55 to 0.7
0.2 to 0.35
Chromium (Cr), % 3.8 to 4.5
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.3 to 83.8
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.5 to 5.5
4.5 to 6.0
Nickel (Ni), % 0 to 0.3
2.0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0
0 to 1.5
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.5 to 6.8
0
Vanadium (V), % 1.8 to 2.2
0