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Annealed SAE-AISI M42 vs. Annealed R30035 Cobalt

Annealed SAE-AISI M42 belongs to the iron alloys classification, while annealed R30035 cobalt belongs to the cobalt alloys. They have a modest 23% 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 (11, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI M42 and the bottom bar is annealed R30035 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
84
Tensile Strength: Ultimate (UTS), MPa 810
900

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1540
1440
Melting Onset (Solidus), °C 1490
1320
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 20
11
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 30
100
Density, g/cm3 8.2
8.7
Embodied Carbon, kg CO2/kg material 7.4
10
Embodied Energy, MJ/kg 100
140
Embodied Water, L/kg 140
410

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 28
29
Strength to Weight: Bending, points 24
24
Thermal Diffusivity, mm2/s 5.4
3.0
Thermal Shock Resistance, points 25
23

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 1.1 to 1.2
0 to 0.025
Chromium (Cr), % 3.5 to 4.3
19 to 21
Cobalt (Co), % 7.8 to 8.8
29.1 to 39
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
0 to 1.0
Manganese (Mn), % 0.15 to 0.4
0 to 0.15
Molybdenum (Mo), % 9.0 to 10
9.0 to 10.5
Nickel (Ni), % 0 to 0.3
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0.15 to 0.65
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Tungsten (W), % 1.2 to 1.9
0
Vanadium (V), % 1.0 to 1.4
0