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SAE-AISI M3 Class 2 Steel vs. R30035 Cobalt

SAE-AISI M3 class 2 steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (9, 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 R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220 to 230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
84 to 89
Tensile Strength: Ultimate (UTS), MPa 770 to 2210
900 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1620
1440
Melting Onset (Solidus), °C 1570
1320
Specific Heat Capacity, J/kg-K 440
440
Thermal Conductivity, W/m-K 26
11
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
100
Density, g/cm3 8.3
8.7
Embodied Carbon, kg CO2/kg material 12
10
Embodied Energy, MJ/kg 180
140
Embodied Water, L/kg 110
410

Common Calculations

Stiffness to Weight: Axial, points 13
14 to 15
Stiffness to Weight: Bending, points 23
23 to 24
Strength to Weight: Axial, points 26 to 74
29 to 61
Strength to Weight: Bending, points 22 to 45
24 to 39
Thermal Diffusivity, mm2/s 7.2
3.0
Thermal Shock Resistance, points 24 to 69
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 1.2 to 1.3
0 to 0.025
Chromium (Cr), % 3.8 to 4.5
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.8 to 82.3
0 to 1.0
Manganese (Mn), % 0.15 to 0.4
0 to 0.15
Molybdenum (Mo), % 4.8 to 6.5
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), % 0.2 to 0.45
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Tungsten (W), % 5.0 to 6.8
0
Vanadium (V), % 2.8 to 3.8
0

Comparable Variants