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ASTM A302 Alloy Steel vs. R31233 Cobalt

ASTM A302 alloy steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ASTM A302 alloy steel and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 20 to 23
17
Fatigue Strength, MPa 250 to 280
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
85
Tensile Strength: Ultimate (UTS), MPa 590 to 620
1020
Tensile Strength: Yield (Proof), MPa 350 to 390
420

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1460
1350
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 39 to 51
12
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2 to 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2 to 8.4
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8 to 7.9
8.6
Embodied Carbon, kg CO2/kg material 1.5 to 1.6
8.4
Embodied Energy, MJ/kg 20 to 21
110
Embodied Water, L/kg 48 to 50
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
140
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 410
410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 21 to 22
33
Strength to Weight: Bending, points 20 to 21
26
Thermal Diffusivity, mm2/s 10 to 14
3.2
Thermal Shock Resistance, points 17 to 18
25