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SAE-AISI M48 Steel vs. R30006 Cobalt

SAE-AISI M48 steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 18 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M48 steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
85
Tensile Strength: Ultimate (UTS), MPa 890 to 2390
900

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1670
1400
Melting Onset (Solidus), °C 1620
1290
Specific Heat Capacity, J/kg-K 420
450
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 8.7
8.6
Embodied Carbon, kg CO2/kg material 13
7.8
Embodied Energy, MJ/kg 190
110
Embodied Water, L/kg 160
500

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
23
Strength to Weight: Axial, points 28 to 76
29
Strength to Weight: Bending, points 23 to 45
24
Thermal Shock Resistance, points 26 to 71
26

Alloy Composition

Carbon (C), % 1.4 to 1.5
0.9 to 1.4
Chromium (Cr), % 3.5 to 4.0
27 to 32
Cobalt (Co), % 8.0 to 10
48.6 to 68.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 63.8 to 69.8
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.8 to 5.5
0 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.15 to 0.4
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 9.5 to 10.5
4.0 to 6.0
Vanadium (V), % 2.8 to 3.3
0