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SAE-AISI S7 Steel vs. S31100 Stainless Steel

Both SAE-AISI S7 steel and S31100 stainless steel are iron alloys. They have 71% 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 S7 steel and the bottom bar is S31100 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 74
79
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
1000

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
16
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
16
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.3
3.1
Embodied Energy, MJ/kg 31
44
Embodied Water, L/kg 65
170

Common Calculations

PREN (Pitting Resistance) 8.4
26
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 72
36
Strength to Weight: Bending, points 22 to 46
29
Thermal Diffusivity, mm2/s 11
4.2
Thermal Shock Resistance, points 22 to 66
28

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.060
Chromium (Cr), % 3.0 to 3.5
25 to 27
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 91.6 to 94.9
63.6 to 69
Manganese (Mn), % 0.2 to 0.9
0 to 1.0
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 0
6.0 to 7.0
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.25
Vanadium (V), % 0 to 0.3
0