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SAE-AISI M42 Steel vs. R30155 Cobalt

Both SAE-AISI M42 steel and R30155 cobalt are iron alloys. They have 48% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M42 steel and the bottom bar is R30155 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 78
81
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
850

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1540
1470
Melting Onset (Solidus), °C 1490
1420
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 20
12
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Base Metal Price, % relative 30
80
Density, g/cm3 8.2
8.5
Embodied Carbon, kg CO2/kg material 7.4
9.7
Embodied Energy, MJ/kg 100
150
Embodied Water, L/kg 140
300

Common Calculations

PREN (Pitting Resistance) 38
37
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 28 to 79
28
Strength to Weight: Bending, points 24 to 48
24
Thermal Diffusivity, mm2/s 5.4
3.2
Thermal Shock Resistance, points 25 to 71
21

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.080 to 0.16
Chromium (Cr), % 3.5 to 4.3
20 to 22.5
Cobalt (Co), % 7.8 to 8.8
18.5 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
24.3 to 36.2
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 9.0 to 10
2.5 to 3.5
Nickel (Ni), % 0 to 0.3
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.15 to 0.65
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 1.2 to 1.9
2.0 to 3.0
Vanadium (V), % 1.0 to 1.4
0