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Annealed SAE-AISI A7 vs. Annealed SAE-AISI A9

Both annealed SAE-AISI A7 and annealed SAE-AISI A9 are iron alloys. Both are furnished in the annealed condition. They have a moderately high 93% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (8, 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 SAE-AISI A9.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
74
Tensile Strength: Ultimate (UTS), MPa 800
770

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 37
35
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
7.0
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 13
4.7
Embodied Energy, MJ/kg 200
70
Embodied Water, L/kg 100
82

Common Calculations

PREN (Pitting Resistance) 11
10
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29
28
Strength to Weight: Bending, points 25
24
Thermal Diffusivity, mm2/s 10
9.6
Thermal Shock Resistance, points 27
25

Alloy Composition

Carbon (C), % 2.0 to 2.9
0.45 to 0.55
Chromium (Cr), % 5.0 to 5.8
4.8 to 5.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 81.4 to 87.7
87 to 90.5
Manganese (Mn), % 0 to 0.8
0 to 0.5
Molybdenum (Mo), % 0.9 to 1.4
1.3 to 1.8
Nickel (Ni), % 0 to 0.3
1.3 to 1.8
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.5
1.0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0.8 to 1.4