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SAE-AISI H19 Steel vs. R30021 Cobalt

SAE-AISI H19 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 H19 steel and the bottom bar is R30021 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 75
86
Tensile Strength: Ultimate (UTS), MPa 720 to 1990
700

Thermal Properties

Latent Heat of Fusion, J/g 260
330
Melting Completion (Liquidus), °C 1540
1350
Melting Onset (Solidus), °C 1490
1190
Specific Heat Capacity, J/kg-K 460
450
Thermal Conductivity, W/m-K 29
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 8.2
8.4
Embodied Carbon, kg CO2/kg material 7.5
8.0
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 110
520

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 68
23
Strength to Weight: Bending, points 22 to 43
21
Thermal Diffusivity, mm2/s 7.9
3.8
Thermal Shock Resistance, points 21 to 59
21

Alloy Composition

Carbon (C), % 0.32 to 0.45
0.2 to 0.35
Chromium (Cr), % 4.0 to 4.8
26 to 29
Cobalt (Co), % 4.0 to 4.5
61.7 to 67.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.4 to 85.5
0 to 3.0
Manganese (Mn), % 0.2 to 0.5
0
Molybdenum (Mo), % 0.3 to 0.55
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), % 0.2 to 0.5
0 to 1.5
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 3.8 to 4.5
0
Vanadium (V), % 1.8 to 2.2
0