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R30021 Cobalt vs. SAE-AISI M34 Steel

R30021 cobalt belongs to the cobalt alloys classification, while SAE-AISI M34 steel belongs to the iron 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 R30021 cobalt and the bottom bar is SAE-AISI M34 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
77
Tensile Strength: Ultimate (UTS), MPa 700
800 to 2170

Thermal Properties

Latent Heat of Fusion, J/g 330
270
Melting Completion (Liquidus), °C 1350
1540
Melting Onset (Solidus), °C 1190
1500
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 15
24
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.2
Embodied Carbon, kg CO2/kg material 8.0
9.5
Embodied Energy, MJ/kg 110
140
Embodied Water, L/kg 520
150

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
27 to 74
Strength to Weight: Bending, points 21
23 to 46
Thermal Diffusivity, mm2/s 3.8
6.7
Thermal Shock Resistance, points 21
25 to 67

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.85 to 0.92
Chromium (Cr), % 26 to 29
3.5 to 4.0
Cobalt (Co), % 61.7 to 67.3
7.8 to 8.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
71.3 to 76.5
Manganese (Mn), % 0
0.15 to 0.4
Molybdenum (Mo), % 4.5 to 6.0
7.8 to 9.2
Nickel (Ni), % 2.0 to 3.0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.5
0.2 to 0.45
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0
1.9 to 2.3