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SAE-AISI S7 Steel vs. S39274 Stainless Steel

Both SAE-AISI S7 steel and S39274 stainless steel are iron alloys. They have 67% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S7 steel and the bottom bar is S39274 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 74
81
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
900

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
16
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
24
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 2.3
4.3
Embodied Energy, MJ/kg 31
60
Embodied Water, L/kg 65
180

Common Calculations

PREN (Pitting Resistance) 8.4
43
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 72
32
Strength to Weight: Bending, points 22 to 46
26
Thermal Diffusivity, mm2/s 11
4.2
Thermal Shock Resistance, points 22 to 66
25

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.030
Chromium (Cr), % 3.0 to 3.5
24 to 26
Copper (Cu), % 0 to 0.25
0.2 to 0.8
Iron (Fe), % 91.6 to 94.9
57 to 65.6
Manganese (Mn), % 0.2 to 0.9
0 to 1.0
Molybdenum (Mo), % 1.3 to 1.8
2.5 to 3.5
Nickel (Ni), % 0
6.0 to 8.0
Nitrogen (N), % 0
0.24 to 0.32
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 1.0
0 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 0
1.5 to 2.5
Vanadium (V), % 0 to 0.3
0