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SAE-AISI H42 Steel vs. R30816 Cobalt

SAE-AISI H42 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 20 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 H42 steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 700 to 1980
1020

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1620
1540
Melting Onset (Solidus), °C 1570
1460
Specific Heat Capacity, J/kg-K 440
420
Thermal Conductivity, W/m-K 24
13
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.1
Embodied Carbon, kg CO2/kg material 8.8
20
Embodied Energy, MJ/kg 130
320
Embodied Water, L/kg 98
440

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 23 to 65
31
Strength to Weight: Bending, points 21 to 42
25
Thermal Diffusivity, mm2/s 6.5
3.3
Thermal Shock Resistance, points 20 to 57
28

Alloy Composition

Carbon (C), % 0.55 to 0.7
0.32 to 0.42
Chromium (Cr), % 3.8 to 4.5
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.3 to 83.8
0 to 5.0
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 4.5 to 5.5
3.5 to 4.5
Nickel (Ni), % 0 to 0.3
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 5.5 to 6.8
3.5 to 4.5
Vanadium (V), % 1.8 to 2.2
0