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SAE-AISI H42 Steel vs. R30012 Cobalt

SAE-AISI H42 steel belongs to the iron alloys classification, while R30012 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 R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 700 to 1980
830

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1620
1470
Melting Onset (Solidus), °C 1570
1280
Specific Heat Capacity, J/kg-K 440
440
Thermal Conductivity, W/m-K 24
15
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.8
Embodied Carbon, kg CO2/kg material 8.8
8.3
Embodied Energy, MJ/kg 130
120
Embodied Water, L/kg 98
480

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 23 to 65
26
Strength to Weight: Bending, points 21 to 42
22
Thermal Diffusivity, mm2/s 6.5
3.8
Thermal Shock Resistance, points 20 to 57
23

Alloy Composition

Carbon (C), % 0.55 to 0.7
1.4 to 2.0
Chromium (Cr), % 3.8 to 4.5
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
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
0 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.5 to 6.8
7.5 to 9.5
Vanadium (V), % 1.8 to 2.2
0