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SAE-AISI O7 Steel vs. S41050 Stainless Steel

Both SAE-AISI O7 steel and S41050 stainless steel are iron alloys. They have 88% of their average alloy composition in common. There are 24 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 S41050 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 680 to 2110
470

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1480
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
27
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
3.3

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
1.9
Embodied Energy, MJ/kg 33
27
Embodied Water, L/kg 52
97

Common Calculations

PREN (Pitting Resistance) 3.6
12
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 74
17
Strength to Weight: Bending, points 22 to 46
17
Thermal Diffusivity, mm2/s 11
7.2
Thermal Shock Resistance, points 23 to 70
17

Alloy Composition

Carbon (C), % 1.1 to 1.3
0 to 0.040
Chromium (Cr), % 0.35 to 0.85
10.5 to 12.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.9 to 97.6
84.2 to 88.9
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.3
0
Nickel (Ni), % 0 to 0.3
0.6 to 1.1
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0 to 0.6
0 to 1.0
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