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SAE-AISI 9254 Steel vs. R30012 Cobalt

SAE-AISI 9254 steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9254 steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 20
1.0
Fatigue Strength, MPa 280
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
86
Tensile Strength: Ultimate (UTS), MPa 660
830
Tensile Strength: Yield (Proof), MPa 410
650

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1400
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 13
12

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
8.8
Embodied Carbon, kg CO2/kg material 1.5
8.3
Embodied Energy, MJ/kg 20
120
Embodied Water, L/kg 49
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 450
960
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 24
26
Strength to Weight: Bending, points 22
22
Thermal Diffusivity, mm2/s 12
3.8
Thermal Shock Resistance, points 20
23

Alloy Composition

Carbon (C), % 0.51 to 0.59
1.4 to 2.0
Chromium (Cr), % 0.6 to 0.8
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
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
7.5 to 9.5