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R30016 Cobalt vs. SAE-AISI H21 Steel

R30016 cobalt belongs to the cobalt alloys classification, while SAE-AISI H21 steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is SAE-AISI H21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
76
Tensile Strength: Ultimate (UTS), MPa 1010
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1630
Melting Onset (Solidus), °C 1270
1580
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 15
27
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Density, g/cm3 8.5
8.5
Embodied Carbon, kg CO2/kg material 7.7
4.5
Embodied Energy, MJ/kg 110
68
Embodied Water, L/kg 500
72

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 33
23 to 58
Strength to Weight: Bending, points 26
21 to 38
Thermal Diffusivity, mm2/s 3.9
7.1
Thermal Shock Resistance, points 24
24 to 59

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.28 to 0.36
Chromium (Cr), % 28 to 32
3.0 to 3.8
Cobalt (Co), % 49.6 to 66.9
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
87.6 to 93.8
Manganese (Mn), % 0.5 to 2.0
0.15 to 0.4
Molybdenum (Mo), % 0 to 1.5
0
Nickel (Ni), % 0 to 3.0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.2 to 2.0
0.15 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 3.5 to 5.5
8.5 to 10
Vanadium (V), % 0
0.3 to 0.6