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Annealed SAE-AISI H21 vs. Annealed R31538 Cobalt

Annealed SAE-AISI H21 belongs to the iron alloys classification, while annealed R31538 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI H21 and the bottom bar is annealed R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 720
1020

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1630
1360
Melting Onset (Solidus), °C 1580
1290
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 27
13
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Density, g/cm3 8.5
8.4
Embodied Carbon, kg CO2/kg material 4.5
8.1
Embodied Energy, MJ/kg 68
110
Embodied Water, L/kg 72
530

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 23
34
Strength to Weight: Bending, points 21
27
Thermal Diffusivity, mm2/s 7.1
3.5
Thermal Shock Resistance, points 24
25

Alloy Composition

Carbon (C), % 0.28 to 0.36
0.15 to 0.35
Chromium (Cr), % 3.0 to 3.8
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.6 to 93.8
0 to 0.75
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 0.3
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.15 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 8.5 to 10
0
Vanadium (V), % 0.3 to 0.6
0