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SAE-AISI M3 Class 1 Steel vs. G-CoCr28 Cobalt

SAE-AISI M3 class 1 steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 22% 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 M3 class 1 steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
560

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1610
1330
Melting Onset (Solidus), °C 1570
1270
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 26
8.5
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Base Metal Price, % relative 25
100
Density, g/cm3 8.3
8.1
Embodied Carbon, kg CO2/kg material 10
6.2
Embodied Energy, MJ/kg 150
84
Embodied Water, L/kg 100
440

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
19
Strength to Weight: Bending, points 22 to 44
19
Thermal Diffusivity, mm2/s 7.2
2.2
Thermal Shock Resistance, points 24 to 67
14

Alloy Composition

Carbon (C), % 1.0 to 1.1
0.050 to 0.25
Chromium (Cr), % 3.8 to 4.5
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.9 to 82.9
9.7 to 24.5
Manganese (Mn), % 0.15 to 0.4
0 to 1.5
Molybdenum (Mo), % 4.8 to 6.5
0 to 0.5
Nickel (Ni), % 0 to 0.3
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.0 to 6.8
0
Vanadium (V), % 2.3 to 2.8
0