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SAE-AISI D2 Steel vs. R30006 Cobalt

SAE-AISI D2 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 (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI D2 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, % 5.0 to 16
1.0
Fatigue Strength, MPa 310 to 860
260
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
85
Tensile Strength: Ultimate (UTS), MPa 760 to 2000
900
Tensile Strength: Yield (Proof), MPa 470 to 1510
540

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 31
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 4.3
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 5.1
1.7

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.6
Embodied Carbon, kg CO2/kg material 3.4
7.8
Embodied Energy, MJ/kg 50
110
Embodied Water, L/kg 100
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 92 to 100
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 570 to 5940
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27 to 72
29
Strength to Weight: Bending, points 24 to 46
24
Thermal Diffusivity, mm2/s 8.3
3.9
Thermal Shock Resistance, points 25 to 67
26

Alloy Composition

Carbon (C), % 1.4 to 1.6
0.9 to 1.4
Chromium (Cr), % 11 to 13
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.3 to 86.9
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
4.0 to 6.0
Vanadium (V), % 0 to 1.1
0