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SAE-AISI 5140 Steel vs. G-CoCr28 Cobalt

SAE-AISI 5140 steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 5140 steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 12 to 29
6.7
Fatigue Strength, MPa 220 to 570
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
83
Tensile Strength: Ultimate (UTS), MPa 560 to 970
560
Tensile Strength: Yield (Proof), MPa 290 to 840
260

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Maximum Temperature: Mechanical, °C 420
1200
Melting Completion (Liquidus), °C 1460
1330
Melting Onset (Solidus), °C 1420
1270
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 45
8.5
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
100
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.4
6.2
Embodied Energy, MJ/kg 19
84
Embodied Water, L/kg 49
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 76 to 180
31
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 1880
160
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 34
19
Strength to Weight: Bending, points 19 to 28
19
Thermal Diffusivity, mm2/s 12
2.2
Thermal Shock Resistance, points 16 to 29
14

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.050 to 0.25
Chromium (Cr), % 0.7 to 0.9
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 97.3 to 98.1
9.7 to 24.5
Manganese (Mn), % 0.7 to 0.9
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0.5 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.030