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Annealed SAE-AISI M4 vs. Annealed R30008 Cobalt

Annealed SAE-AISI M4 belongs to the iron alloys classification, while annealed R30008 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 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 annealed SAE-AISI M4 and the bottom bar is annealed R30008 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 76
83
Tensile Strength: Ultimate (UTS), MPa 770
950

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1610
1400
Melting Onset (Solidus), °C 1560
1330
Specific Heat Capacity, J/kg-K 440
450
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
95
Density, g/cm3 8.3
8.4
Embodied Carbon, kg CO2/kg material 14
8.1
Embodied Energy, MJ/kg 210
110
Embodied Water, L/kg 110
400

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
31
Strength to Weight: Bending, points 23
25
Thermal Shock Resistance, points 24
25

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 1.3 to 1.4
0 to 0.15
Chromium (Cr), % 3.8 to 4.8
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
7.6 to 20
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 4.3 to 5.5
6.5 to 7.5
Nickel (Ni), % 0 to 0.3
15 to 18
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0.2 to 0.45
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0