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SAE-AISI O7 Steel vs. S31655 Stainless Steel

Both SAE-AISI O7 steel and S31655 stainless steel are iron alloys. They have 69% 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 S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 680 to 2110
710

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1480
1430
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
15
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 6.0
17
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.3
3.3
Embodied Energy, MJ/kg 33
46
Embodied Water, L/kg 52
160

Common Calculations

PREN (Pitting Resistance) 3.6
27
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 74
25
Strength to Weight: Bending, points 22 to 46
23
Thermal Diffusivity, mm2/s 11
4.0
Thermal Shock Resistance, points 23 to 70
16

Alloy Composition

Carbon (C), % 1.1 to 1.3
0 to 0.030
Chromium (Cr), % 0.35 to 0.85
19.5 to 21.5
Copper (Cu), % 0 to 0.25
0 to 1.0
Iron (Fe), % 92.9 to 97.6
63.2 to 71.9
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.3
0.5 to 1.5
Nickel (Ni), % 0 to 0.3
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
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 0.015
Tungsten (W), % 1.0 to 2.0
0
Vanadium (V), % 0 to 0.4
0