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Annealed SAE-AISI A7 vs. Annealed R30035 Cobalt

Annealed SAE-AISI A7 belongs to the iron alloys classification, while annealed R30035 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI A7 and the bottom bar is annealed R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
84
Tensile Strength: Ultimate (UTS), MPa 800
900

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1320
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 37
11
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
100
Density, g/cm3 7.7
8.7
Embodied Carbon, kg CO2/kg material 13
10
Embodied Energy, MJ/kg 200
140
Embodied Water, L/kg 100
410

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 29
29
Strength to Weight: Bending, points 25
24
Thermal Diffusivity, mm2/s 10
3.0
Thermal Shock Resistance, points 27
23

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 2.0 to 2.9
0 to 0.025
Chromium (Cr), % 5.0 to 5.8
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.4 to 87.7
0 to 1.0
Manganese (Mn), % 0 to 0.8
0 to 0.15
Molybdenum (Mo), % 0.9 to 1.4
9.0 to 10.5
Nickel (Ni), % 0 to 0.3
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0