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SAE-AISI 9254 Steel vs. R31537 Cobalt

SAE-AISI 9254 steel belongs to the iron alloys classification, while R31537 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 R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 20
14 to 23
Fatigue Strength, MPa 280
310 to 480
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
87
Tensile Strength: Ultimate (UTS), MPa 660
1000 to 1340
Tensile Strength: Yield (Proof), MPa 410
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1400
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 46
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 1.5
8.1
Embodied Energy, MJ/kg 20
110
Embodied Water, L/kg 49
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 450
780 to 1990
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
33 to 44
Strength to Weight: Bending, points 22
26 to 32
Thermal Diffusivity, mm2/s 12
3.4
Thermal Shock Resistance, points 20
24 to 32

Alloy Composition

Carbon (C), % 0.51 to 0.59
0 to 0.14
Chromium (Cr), % 0.6 to 0.8
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 96.1 to 97.1
0 to 0.75
Manganese (Mn), % 0.6 to 0.8
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 1.2 to 1.6
0 to 1.0
Sulfur (S), % 0 to 0.040
0