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SAE-AISI 9254 Steel vs. R30001 Cobalt

SAE-AISI 9254 steel belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9254 steel and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 20
1.0
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
86
Tensile Strength: Ultimate (UTS), MPa 660
620

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1440
1530
Melting Onset (Solidus), °C 1400
1260
Specific Heat Capacity, J/kg-K 480
430
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.0
Embodied Carbon, kg CO2/kg material 1.5
8.9
Embodied Energy, MJ/kg 20
130
Embodied Water, L/kg 49
460

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 24
19
Strength to Weight: Bending, points 22
18
Thermal Diffusivity, mm2/s 12
3.7
Thermal Shock Resistance, points 20
19

Alloy Composition

Carbon (C), % 0.51 to 0.59
2.0 to 3.0
Chromium (Cr), % 0.6 to 0.8
28 to 32
Cobalt (Co), % 0
43 to 59
Iron (Fe), % 96.1 to 97.1
0 to 3.0
Manganese (Mn), % 0.6 to 0.8
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 1.2 to 1.6
0 to 2.0
Sulfur (S), % 0 to 0.040
0
Tungsten (W), % 0
11 to 13