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SAE-AISI 4145 Steel vs. R30006 Cobalt

SAE-AISI 4145 steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4145 steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 16
1.0
Fatigue Strength, MPa 240
260
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 33
40
Shear Modulus, GPa 73
85
Tensile Strength: Ultimate (UTS), MPa 580
900
Tensile Strength: Yield (Proof), MPa 360
540

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 42
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
1.7

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.6
Embodied Carbon, kg CO2/kg material 1.5
7.8
Embodied Energy, MJ/kg 20
110
Embodied Water, L/kg 51
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 350
670
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 21
29
Strength to Weight: Bending, points 20
24
Thermal Diffusivity, mm2/s 11
3.9
Thermal Shock Resistance, points 17
26

Alloy Composition

Carbon (C), % 0.43 to 0.48
0.9 to 1.4
Chromium (Cr), % 0.8 to 1.1
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 96.7 to 97.7
0 to 3.0
Manganese (Mn), % 0.75 to 1.0
0
Molybdenum (Mo), % 0.15 to 0.25
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 2.0
Sulfur (S), % 0 to 0.040
0
Tungsten (W), % 0
4.0 to 6.0