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SAE-AISI M42 Steel vs. R30003 Cobalt

SAE-AISI M42 steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M42 steel and the bottom bar is R30003 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
83
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
970 to 1720

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1540
1400
Melting Onset (Solidus), °C 1490
1440
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 20
13
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 30
95
Density, g/cm3 8.2
8.4
Embodied Carbon, kg CO2/kg material 7.4
8.0
Embodied Energy, MJ/kg 100
110
Embodied Water, L/kg 140
400

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 79
32 to 57
Strength to Weight: Bending, points 24 to 48
26 to 38
Thermal Diffusivity, mm2/s 5.4
3.3
Thermal Shock Resistance, points 25 to 71
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 1.1 to 1.2
0 to 0.15
Chromium (Cr), % 3.5 to 4.3
19 to 21
Cobalt (Co), % 7.8 to 8.8
39 to 41
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
10 to 20.5
Manganese (Mn), % 0.15 to 0.4
1.5 to 2.5
Molybdenum (Mo), % 9.0 to 10
6.0 to 8.0
Nickel (Ni), % 0 to 0.3
14 to 16
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0.15 to 0.65
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 1.2 to 1.9
0
Vanadium (V), % 1.0 to 1.4
0

Comparable Variants