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SAE-AISI H21 Steel vs. R30605 Cobalt

SAE-AISI H21 steel belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H21 steel and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
1130 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1630
1410
Melting Onset (Solidus), °C 1580
1330
Specific Heat Capacity, J/kg-K 440
410
Thermal Conductivity, W/m-K 27
9.6
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

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

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 23
21
Strength to Weight: Axial, points 23 to 58
33 to 55
Strength to Weight: Bending, points 21 to 38
25 to 36
Thermal Diffusivity, mm2/s 7.1
2.5
Thermal Shock Resistance, points 24 to 59
31 to 52

Alloy Composition

Carbon (C), % 0.28 to 0.36
0.050 to 0.15
Chromium (Cr), % 3.0 to 3.8
19 to 21
Cobalt (Co), % 0
46.4 to 57
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.6 to 93.8
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.0
Nickel (Ni), % 0 to 0.3
9.0 to 11
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.15 to 0.5
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 8.5 to 10
14 to 16
Vanadium (V), % 0.3 to 0.6
0

Comparable Variants