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SAE-AISI M30 Steel vs. R30816 Cobalt

SAE-AISI M30 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 20 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 M30 steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 78
81
Tensile Strength: Ultimate (UTS), MPa 800 to 2170
1020

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1550
1540
Melting Onset (Solidus), °C 1500
1460
Specific Heat Capacity, J/kg-K 450
420
Thermal Conductivity, W/m-K 24
13
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.2
9.1
Embodied Carbon, kg CO2/kg material 7.2
20
Embodied Energy, MJ/kg 100
320
Embodied Water, L/kg 120
440

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 27 to 74
31
Strength to Weight: Bending, points 24 to 46
25
Thermal Diffusivity, mm2/s 6.6
3.3
Thermal Shock Resistance, points 25 to 67
28

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.32 to 0.42
Chromium (Cr), % 3.5 to 4.3
19 to 21
Cobalt (Co), % 4.5 to 5.5
40 to 49.8
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.2 to 80.9
0 to 5.0
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 7.8 to 9.0
3.5 to 4.5
Nickel (Ni), % 0 to 0.3
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
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
3.5 to 4.5
Tungsten (W), % 1.3 to 2.3
3.5 to 4.5
Vanadium (V), % 1.0 to 1.4
0