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SAE-AISI S7 Steel vs. S38815 Stainless Steel

Both SAE-AISI S7 steel and S38815 stainless steel are iron alloys. They have 67% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S7 steel and the bottom bar is S38815 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
74
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
610

Thermal Properties

Latent Heat of Fusion, J/g 260
370
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1420
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
19
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 2.3
3.8
Embodied Energy, MJ/kg 31
54
Embodied Water, L/kg 65
140

Common Calculations

PREN (Pitting Resistance) 8.4
18
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 72
22
Strength to Weight: Bending, points 22 to 46
21
Thermal Shock Resistance, points 22 to 66
15

Alloy Composition

Aluminum (Al), % 0
0 to 0.3
Carbon (C), % 0.45 to 0.55
0 to 0.030
Chromium (Cr), % 3.0 to 3.5
13 to 15
Copper (Cu), % 0 to 0.25
0.75 to 1.5
Iron (Fe), % 91.6 to 94.9
56.1 to 67
Manganese (Mn), % 0.2 to 0.9
0 to 2.0
Molybdenum (Mo), % 1.3 to 1.8
0.75 to 1.5
Nickel (Ni), % 0
13 to 17
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 1.0
5.5 to 6.5
Sulfur (S), % 0 to 0.030
0 to 0.020
Vanadium (V), % 0 to 0.3
0