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SAE-AISI 4130 Steel vs. R30006 Cobalt

SAE-AISI 4130 steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. There are 27 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 4130 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, % 13 to 26
1.0
Fatigue Strength, MPa 320 to 660
260
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
85
Tensile Strength: Ultimate (UTS), MPa 530 to 1040
900
Tensile Strength: Yield (Proof), MPa 440 to 980
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 43
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
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 50
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 180
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 500 to 2550
670
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 19 to 37
29
Strength to Weight: Bending, points 19 to 29
24
Thermal Diffusivity, mm2/s 12
3.9
Thermal Shock Resistance, points 16 to 31
26

Alloy Composition

Carbon (C), % 0.28 to 0.33
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), % 97.3 to 98.2
0 to 3.0
Manganese (Mn), % 0.4 to 0.6
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