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EN 2.4964 Cobalt vs. SAE-AISI H21 Steel

EN 2.4964 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 (9, in this case) are not shown.

For each property being compared, the top bar is EN 2.4964 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 0.29
0.29
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 960
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1630
1630
Melting Onset (Solidus), °C 1550
1580
Specific Heat Capacity, J/kg-K 400
440
Thermal Conductivity, W/m-K 15
27
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.6
8.5
Embodied Carbon, kg CO2/kg material 9.8
4.5
Embodied Energy, MJ/kg 140
68
Embodied Water, L/kg 450
72

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 21
23
Strength to Weight: Axial, points 28
23 to 58
Strength to Weight: Bending, points 23
21 to 38
Thermal Diffusivity, mm2/s 3.9
7.1
Thermal Shock Resistance, points 25
24 to 59

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.28 to 0.36
Chromium (Cr), % 19 to 21
3.0 to 3.8
Cobalt (Co), % 46.4 to 58
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
87.6 to 93.8
Manganese (Mn), % 0 to 2.0
0.15 to 0.4
Nickel (Ni), % 9.0 to 11
0 to 0.3
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0 to 0.4
0.15 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 14 to 16
8.5 to 10
Vanadium (V), % 0
0.3 to 0.6