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SAE-AISI D4 Steel vs. R30012 Cobalt

SAE-AISI D4 steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI D4 steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 8.4 to 15
1.0
Fatigue Strength, MPa 310 to 920
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 74
86
Tensile Strength: Ultimate (UTS), MPa 760 to 2060
830
Tensile Strength: Yield (Proof), MPa 470 to 1540
650

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1380
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 31
15
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 4.2
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 5.0
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.8
Embodied Carbon, kg CO2/kg material 3.3
8.3
Embodied Energy, MJ/kg 49
120
Embodied Water, L/kg 100
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100 to 160
7.7
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27 to 75
26
Strength to Weight: Bending, points 24 to 47
22
Thermal Diffusivity, mm2/s 8.3
3.8
Thermal Shock Resistance, points 23 to 63
23

Alloy Composition

Carbon (C), % 2.1 to 2.4
1.4 to 2.0
Chromium (Cr), % 11 to 13
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 80.6 to 86.3
0 to 3.0
Manganese (Mn), % 0 to 0.6
0
Molybdenum (Mo), % 0.7 to 1.2
0 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.6
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5
Vanadium (V), % 0 to 1.0
0