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ASTM A217 Cast Steel vs. R31539 Cobalt

ASTM A217 cast steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ASTM A217 cast steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 21 to 27
13 to 22
Fatigue Strength, MPa 200 to 320
310 to 480
Poisson's Ratio 0.28 to 0.29
0.29
Reduction in Area, % 39 to 50
13 to 23
Shear Modulus, GPa 73 to 75
86
Tensile Strength: Ultimate (UTS), MPa 540 to 710
1000 to 1340
Tensile Strength: Yield (Proof), MPa 270 to 460
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 250 to 270
320
Melting Completion (Liquidus), °C 1450 to 1460
1360
Melting Onset (Solidus), °C 1410 to 1420
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 26 to 50
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3 to 9.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4 to 11
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.5 to 2.1
8.2
Embodied Energy, MJ/kg 20 to 28
110
Embodied Water, L/kg 47 to 87
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 130
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 190 to 570
780 to 2000
Stiffness to Weight: Axial, points 13 to 14
15
Stiffness to Weight: Bending, points 24 to 25
24
Strength to Weight: Axial, points 19 to 25
33 to 44
Strength to Weight: Bending, points 19 to 23
27 to 32
Thermal Diffusivity, mm2/s 6.9 to 14
3.5
Thermal Shock Resistance, points 16 to 20
24 to 32