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R31539 Cobalt vs. SAE-AISI 4340M Steel

R31539 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4340M steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 22
6.0
Fatigue Strength, MPa 310 to 480
690
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 25 to 35
55
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
2340
Tensile Strength: Yield (Proof), MPa 590 to 940
1240

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
38
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
9.1

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.9
Embodied Energy, MJ/kg 110
26
Embodied Water, L/kg 530
55

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
120
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
4120
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
84
Strength to Weight: Bending, points 27 to 32
51
Thermal Diffusivity, mm2/s 3.5
10
Thermal Shock Resistance, points 24 to 32
70

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.38 to 0.43
Chromium (Cr), % 26 to 30
0.7 to 1.0
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
93.3 to 94.8
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0.65 to 0.9
Molybdenum (Mo), % 5.0 to 7.0
0.35 to 0.45
Nickel (Ni), % 0 to 1.0
1.7 to 2.0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.012
Silicon (Si), % 0 to 1.0
1.5 to 1.8
Sulfur (S), % 0
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1