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SAE-AISI 1055 Steel vs. R31537 Cobalt

SAE-AISI 1055 steel belongs to the iron alloys classification, while R31537 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 SAE-AISI 1055 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, % 11 to 14
14 to 23
Fatigue Strength, MPa 260 to 390
310 to 480
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34 to 45
13 to 23
Shear Modulus, GPa 72
87
Tensile Strength: Ultimate (UTS), MPa 730 to 750
1000 to 1340
Tensile Strength: Yield (Proof), MPa 400 to 630
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1420
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 51
13
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 12
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.4
8.1
Embodied Energy, MJ/kg 18
110
Embodied Water, L/kg 46
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80 to 85
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 440 to 1070
780 to 1990
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
33 to 44
Strength to Weight: Bending, points 23
26 to 32
Thermal Diffusivity, mm2/s 14
3.4
Thermal Shock Resistance, points 23 to 24
24 to 32

Alloy Composition

Carbon (C), % 0.5 to 0.6
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 98.4 to 98.9
0 to 0.75
Manganese (Mn), % 0.6 to 0.9
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 0.040
0
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0

Comparable Variants