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SAE-AISI O7 Steel vs. SAE-AISI 1038 Steel

Both SAE-AISI O7 steel and SAE-AISI 1038 steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O7 steel and the bottom bar is SAE-AISI 1038 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
73
Tensile Strength: Ultimate (UTS), MPa 680 to 2110
590 to 640

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1480
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
51
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 6.0
1.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.3
1.4
Embodied Energy, MJ/kg 33
18
Embodied Water, L/kg 52
46

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 74
21 to 23
Strength to Weight: Bending, points 22 to 46
20 to 21
Thermal Diffusivity, mm2/s 11
14
Thermal Shock Resistance, points 23 to 70
19 to 20

Alloy Composition

Carbon (C), % 1.1 to 1.3
0.35 to 0.42
Chromium (Cr), % 0.35 to 0.85
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.9 to 97.6
98.6 to 99.05
Manganese (Mn), % 0 to 1.0
0.6 to 0.9
Molybdenum (Mo), % 0 to 0.3
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.6
0
Sulfur (S), % 0 to 0.030
0 to 0.050
Tungsten (W), % 1.0 to 2.0
0
Vanadium (V), % 0 to 0.4
0