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SAE-AISI M3 Class 2 Steel vs. R30155 Cobalt

Both SAE-AISI M3 class 2 steel and R30155 cobalt are iron alloys. They have 41% 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 M3 class 2 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 77
81
Tensile Strength: Ultimate (UTS), MPa 770 to 2210
850

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1620
1470
Melting Onset (Solidus), °C 1570
1420
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 26
12
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Base Metal Price, % relative 25
80
Density, g/cm3 8.3
8.5
Embodied Carbon, kg CO2/kg material 12
9.7
Embodied Energy, MJ/kg 180
150
Embodied Water, L/kg 110
300

Common Calculations

PREN (Pitting Resistance) 33
37
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 26 to 74
28
Strength to Weight: Bending, points 22 to 45
24
Thermal Diffusivity, mm2/s 7.2
3.2
Thermal Shock Resistance, points 24 to 69
21

Alloy Composition

Carbon (C), % 1.2 to 1.3
0.080 to 0.16
Chromium (Cr), % 3.8 to 4.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.8 to 82.3
24.3 to 36.2
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 4.8 to 6.5
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), % 0.2 to 0.45
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 5.0 to 6.8
2.0 to 3.0
Vanadium (V), % 2.8 to 3.8
0