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Annealed SAE-AISI A9 vs. Annealed R30075 Cobalt

Annealed SAE-AISI A9 belongs to the iron alloys classification, while annealed R30075 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI A9 and the bottom bar is annealed R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 21
12
Fatigue Strength, MPa 250
260
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
82
Tensile Strength: Ultimate (UTS), MPa 770
780
Tensile Strength: Yield (Proof), MPa 360
480

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 35
13
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 4.7
8.1
Embodied Energy, MJ/kg 70
110
Embodied Water, L/kg 82
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
84
Resilience: Unit (Modulus of Resilience), kJ/m3 350
560
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28
26
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 9.6
3.5
Thermal Shock Resistance, points 25
21

Alloy Composition

Aluminum (Al), % 0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0.45 to 0.55
0 to 0.35
Chromium (Cr), % 4.8 to 5.5
27 to 30
Cobalt (Co), % 0
58.7 to 68
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
0 to 0.75
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 1.3 to 1.8
5.0 to 7.0
Nickel (Ni), % 1.3 to 1.8
0 to 0.5
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 1.0 to 1.2
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
Vanadium (V), % 0.8 to 1.4
0