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SAE-AISI 5155 Steel vs. R30016 Cobalt

SAE-AISI 5155 steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 5155 steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 21
8.4
Fatigue Strength, MPa 260
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
85
Tensile Strength: Ultimate (UTS), MPa 620
1010
Tensile Strength: Yield (Proof), MPa 380
580

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1410
1270
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 49
15
Thermal Expansion, µm/m-K 12
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.4
7.7
Embodied Energy, MJ/kg 19
110
Embodied Water, L/kg 49
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
72
Resilience: Unit (Modulus of Resilience), kJ/m3 380
770
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
33
Strength to Weight: Bending, points 21
26
Thermal Diffusivity, mm2/s 13
3.9
Thermal Shock Resistance, points 20
24

Alloy Composition

Carbon (C), % 0.51 to 0.59
0.9 to 1.4
Chromium (Cr), % 0.7 to 0.9
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 97.2 to 97.9
0 to 3.0
Manganese (Mn), % 0.7 to 0.9
0.5 to 2.0
Molybdenum (Mo), % 0
0 to 1.5
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0.2 to 2.0
Sulfur (S), % 0 to 0.040
0
Tungsten (W), % 0
3.5 to 5.5