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SAE-AISI 5155 Steel vs. R30605 Cobalt

SAE-AISI 5155 steel belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 25 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 5155 steel and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 21
34
Fatigue Strength, MPa 260
260 to 590
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
81
Tensile Strength: Ultimate (UTS), MPa 620
1130 to 1900
Tensile Strength: Yield (Proof), MPa 380
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1450
1410
Melting Onset (Solidus), °C 1410
1330
Specific Heat Capacity, J/kg-K 470
410
Thermal Conductivity, W/m-K 49
9.6
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.6
Embodied Carbon, kg CO2/kg material 1.4
9.8
Embodied Energy, MJ/kg 19
140
Embodied Water, L/kg 49
450

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 22
33 to 55
Strength to Weight: Bending, points 21
25 to 36
Thermal Diffusivity, mm2/s 13
2.5
Thermal Shock Resistance, points 20
31 to 52

Alloy Composition

Carbon (C), % 0.51 to 0.59
0.050 to 0.15
Chromium (Cr), % 0.7 to 0.9
19 to 21
Cobalt (Co), % 0
46.4 to 57
Iron (Fe), % 97.2 to 97.9
0 to 3.0
Manganese (Mn), % 0.7 to 0.9
1.0 to 2.0
Nickel (Ni), % 0
9.0 to 11
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
14 to 16