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SAE-AISI A4 Steel vs. R30075 Cobalt

SAE-AISI A4 steel belongs to the iron alloys classification, while R30075 cobalt belongs to the cobalt alloys. There are 22 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 SAE-AISI A4 steel and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210 to 250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
82 to 98
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
780 to 1280

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
13
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.8
8.1
Embodied Energy, MJ/kg 24
110
Embodied Water, L/kg 59
530

Common Calculations

Stiffness to Weight: Axial, points 13
14 to 17
Stiffness to Weight: Bending, points 24
24 to 25
Strength to Weight: Axial, points 25 to 73
26 to 42
Strength to Weight: Bending, points 23 to 46
22 to 31
Thermal Diffusivity, mm2/s 11
3.5
Thermal Shock Resistance, points 23 to 67
21 to 29

Alloy Composition

Aluminum (Al), % 0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 1.0 to 1.1
0 to 0.35
Chromium (Cr), % 0.9 to 2.2
27 to 30
Cobalt (Co), % 0
58.7 to 68
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92 to 95.5
0 to 0.75
Manganese (Mn), % 1.8 to 2.2
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.4
5.0 to 7.0
Nickel (Ni), % 0 to 0.3
0 to 0.5
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 0.1
Tungsten (W), % 0
0 to 0.2

Comparable Variants