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SAE-AISI 1080 Steel vs. R30816 Cobalt

SAE-AISI 1080 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 27 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 1080 steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 260
280
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 11
23
Fatigue Strength, MPa 300 to 360
250
Poisson's Ratio 0.29
0.3
Reduction in Area, % 28 to 45
22
Shear Modulus, GPa 72
81
Tensile Strength: Ultimate (UTS), MPa 770 to 870
1020
Tensile Strength: Yield (Proof), MPa 480 to 590
460

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1450
1540
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 51
13
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 1.4
20
Embodied Energy, MJ/kg 19
320
Embodied Water, L/kg 46
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80 to 84
190
Resilience: Unit (Modulus of Resilience), kJ/m3 610 to 920
510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 27 to 31
31
Strength to Weight: Bending, points 24 to 26
25
Thermal Diffusivity, mm2/s 14
3.3
Thermal Shock Resistance, points 25 to 29
28

Alloy Composition

Carbon (C), % 0.75 to 0.88
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 98.1 to 98.7
0 to 5.0
Manganese (Mn), % 0.6 to 0.9
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5