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SAE-AISI M30 Steel vs. R31233 Cobalt

SAE-AISI M30 steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt 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 SAE-AISI M30 steel and the bottom bar is R31233 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 78
85
Tensile Strength: Ultimate (UTS), MPa 800 to 2170
1020

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1550
1350
Melting Onset (Solidus), °C 1500
1330
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 24
12
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 8.2
8.6
Embodied Carbon, kg CO2/kg material 7.2
8.4
Embodied Energy, MJ/kg 100
110
Embodied Water, L/kg 120
480

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 27 to 74
33
Strength to Weight: Bending, points 24 to 46
26
Thermal Diffusivity, mm2/s 6.6
3.2
Thermal Shock Resistance, points 25 to 67
25

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0.75 to 0.85
0.020 to 0.1
Chromium (Cr), % 3.5 to 4.3
23.5 to 27.5
Cobalt (Co), % 4.5 to 5.5
44.7 to 63.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.2 to 80.9
1.0 to 5.0
Manganese (Mn), % 0.15 to 0.4
0.1 to 1.5
Molybdenum (Mo), % 7.8 to 9.0
4.0 to 6.0
Nickel (Ni), % 0 to 0.3
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.45
0.050 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 1.3 to 2.3
1.0 to 3.0
Vanadium (V), % 1.0 to 1.4
0