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R30816 Cobalt vs. SAE-AISI 4340M Steel

R30816 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4340M steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
710
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
6.0
Fatigue Strength, MPa 250
690
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
72
Tensile Strength: Ultimate (UTS), MPa 1020
2340
Tensile Strength: Yield (Proof), MPa 460
1240

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Melting Completion (Liquidus), °C 1540
1440
Melting Onset (Solidus), °C 1460
1400
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 13
38
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
1.9
Embodied Energy, MJ/kg 320
26
Embodied Water, L/kg 440
55

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
120
Resilience: Unit (Modulus of Resilience), kJ/m3 510
4120
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
84
Strength to Weight: Bending, points 25
51
Thermal Diffusivity, mm2/s 3.3
10
Thermal Shock Resistance, points 28
70

Alloy Composition

Carbon (C), % 0.32 to 0.42
0.38 to 0.43
Chromium (Cr), % 19 to 21
0.7 to 1.0
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
93.3 to 94.8
Manganese (Mn), % 1.0 to 2.0
0.65 to 0.9
Molybdenum (Mo), % 3.5 to 4.5
0.35 to 0.45
Nickel (Ni), % 19 to 21
1.7 to 2.0
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.012
Silicon (Si), % 0 to 1.0
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0
Vanadium (V), % 0
0.050 to 0.1