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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

Comparable Variants