SAE-AISI O7 Steel vs. SAE-AISI A9 Steel
Both SAE-AISI O7 steel and SAE-AISI A9 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common.
For each property being compared, the top bar is SAE-AISI O7 steel and the bottom bar is SAE-AISI A9 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
74 |
Tensile Strength: Ultimate (UTS), MPa | 680 to 2110 | |
770 to 2030 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
280 |
Melting Completion (Liquidus), °C | 1480 | |
1460 |
Melting Onset (Solidus), °C | 1430 | |
1410 |
Specific Heat Capacity, J/kg-K | 470 | |
470 |
Thermal Conductivity, W/m-K | 41 | |
35 |
Thermal Expansion, µm/m-K | 12 | |
12 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
7.9 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.7 | |
9.2 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 6.0 | |
7.0 |
Density, g/cm3 | 7.9 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 2.3 | |
4.7 |
Embodied Energy, MJ/kg | 33 | |
70 |
Embodied Water, L/kg | 52 | |
82 |
Common Calculations
PREN (Pitting Resistance) | 3.6 | |
10 |
Stiffness to Weight: Axial, points | 13 | |
14 |
Stiffness to Weight: Bending, points | 24 | |
25 |
Strength to Weight: Axial, points | 24 to 74 | |
28 to 73 |
Strength to Weight: Bending, points | 22 to 46 | |
24 to 46 |
Thermal Diffusivity, mm2/s | 11 | |
9.6 |
Thermal Shock Resistance, points | 23 to 70 | |
25 to 66 |
Alloy Composition
Carbon (C), % | 1.1 to 1.3 | |
0.45 to 0.55 |
Chromium (Cr), % | 0.35 to 0.85 | |
4.8 to 5.5 |
Copper (Cu), % | 0 to 0.25 | |
0 to 0.25 |
Iron (Fe), % | 92.9 to 97.6 | |
87 to 90.5 |
Manganese (Mn), % | 0 to 1.0 | |
0 to 0.5 |
Molybdenum (Mo), % | 0 to 0.3 | |
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 0.6 | |
1.0 to 1.2 |
Sulfur (S), % | 0 to 0.030 | |
0 to 0.030 |
Tungsten (W), % | 1.0 to 2.0 | |
0 |
Vanadium (V), % | 0 to 0.4 | |
0.8 to 1.4 |