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SAE-AISI M30 Steel vs. R30605 Cobalt

SAE-AISI M30 steel belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 20 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 M30 steel and the bottom bar is R30605 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 78
81
Tensile Strength: Ultimate (UTS), MPa 800 to 2170
1130 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1550
1410
Melting Onset (Solidus), °C 1500
1330
Specific Heat Capacity, J/kg-K 450
410
Thermal Conductivity, W/m-K 24
9.6
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.2
9.6
Embodied Carbon, kg CO2/kg material 7.2
9.8
Embodied Energy, MJ/kg 100
140
Embodied Water, L/kg 120
450

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 27 to 74
33 to 55
Strength to Weight: Bending, points 24 to 46
25 to 36
Thermal Diffusivity, mm2/s 6.6
2.5
Thermal Shock Resistance, points 25 to 67
31 to 52

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.050 to 0.15
Chromium (Cr), % 3.5 to 4.3
19 to 21
Cobalt (Co), % 4.5 to 5.5
46.4 to 57
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.2 to 80.9
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 7.8 to 9.0
0
Nickel (Ni), % 0 to 0.3
9.0 to 11
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.3 to 2.3
14 to 16
Vanadium (V), % 1.0 to 1.4
0

Comparable Variants