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R30605 Cobalt vs. SAE-AISI D4 Steel

R30605 cobalt belongs to the cobalt alloys classification, while SAE-AISI D4 steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is SAE-AISI D4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
8.4 to 15
Fatigue Strength, MPa 260 to 590
310 to 920
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
74
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
760 to 2060
Tensile Strength: Yield (Proof), MPa 470 to 1600
470 to 1540

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Melting Completion (Liquidus), °C 1410
1430
Melting Onset (Solidus), °C 1330
1380
Specific Heat Capacity, J/kg-K 410
480
Thermal Conductivity, W/m-K 9.6
31
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
4.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
5.0

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.7
Embodied Carbon, kg CO2/kg material 9.8
3.3
Embodied Energy, MJ/kg 140
49
Embodied Water, L/kg 450
100

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
27 to 75
Strength to Weight: Bending, points 25 to 36
24 to 47
Thermal Diffusivity, mm2/s 2.5
8.3
Thermal Shock Resistance, points 31 to 52
23 to 63

Alloy Composition

Carbon (C), % 0.050 to 0.15
2.1 to 2.4
Chromium (Cr), % 19 to 21
11 to 13
Cobalt (Co), % 46.4 to 57
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
80.6 to 86.3
Manganese (Mn), % 1.0 to 2.0
0 to 0.6
Molybdenum (Mo), % 0
0.7 to 1.2
Nickel (Ni), % 9.0 to 11
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 0.4
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0
0 to 1.0

Comparable Variants