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AISI 440A Stainless Steel vs. R30006 Cobalt

AISI 440A stainless steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is AISI 440A stainless steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 5.0 to 20
1.0
Fatigue Strength, MPa 270 to 790
260
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
900
Tensile Strength: Yield (Proof), MPa 420 to 1650
540

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1480
1400
Melting Onset (Solidus), °C 1370
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 23
15
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
1.7

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.6
Embodied Carbon, kg CO2/kg material 2.2
7.8
Embodied Energy, MJ/kg 31
110
Embodied Water, L/kg 120
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
7.8
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 26 to 65
29
Strength to Weight: Bending, points 23 to 43
24
Thermal Diffusivity, mm2/s 6.2
3.9
Thermal Shock Resistance, points 26 to 65
26

Alloy Composition

Carbon (C), % 0.6 to 0.75
0.9 to 1.4
Chromium (Cr), % 16 to 18
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 78.4 to 83.4
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.75
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.015
0
Tungsten (W), % 0
4.0 to 6.0