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SAE-AISI O7 Steel vs. S40945 Stainless Steel

Both SAE-AISI O7 steel and S40945 stainless steel are iron alloys. They have 89% 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 S40945 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
75
Tensile Strength: Ultimate (UTS), MPa 680 to 2110
430

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1480
1450
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
26
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
8.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.3
2.2
Embodied Energy, MJ/kg 33
31
Embodied Water, L/kg 52
94

Common Calculations

PREN (Pitting Resistance) 3.6
11
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 74
15
Strength to Weight: Bending, points 22 to 46
16
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 23 to 70
15

Alloy Composition

Carbon (C), % 1.1 to 1.3
0 to 0.030
Chromium (Cr), % 0.35 to 0.85
10.5 to 11.7
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.9 to 97.6
85.1 to 89.3
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.3
0
Nickel (Ni), % 0 to 0.3
0 to 0.5
Niobium (Nb), % 0
0.18 to 0.4
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.6
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.050 to 0.2
Tungsten (W), % 1.0 to 2.0
0
Vanadium (V), % 0 to 0.4
0