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SAE-AISI M34 Steel vs. R30021 Cobalt

SAE-AISI M34 steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt 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 SAE-AISI M34 steel and the bottom bar is R30021 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 77
86
Tensile Strength: Ultimate (UTS), MPa 800 to 2170
700

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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