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SAE-AISI S7 Steel vs. AISI 321 Stainless Steel

Both SAE-AISI S7 steel and AISI 321 stainless steel are iron alloys. They have 74% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S7 steel and the bottom bar is AISI 321 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 74
77
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
590 to 690

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
16
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
16
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.3
3.2
Embodied Energy, MJ/kg 31
45
Embodied Water, L/kg 65
140

Common Calculations

PREN (Pitting Resistance) 8.4
19
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 72
21 to 25
Strength to Weight: Bending, points 22 to 46
20 to 22
Thermal Diffusivity, mm2/s 11
4.1
Thermal Shock Resistance, points 22 to 66
13 to 15

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.080
Chromium (Cr), % 3.0 to 3.5
17 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 91.6 to 94.9
65.3 to 74
Manganese (Mn), % 0.2 to 0.9
0 to 2.0
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 0
9.0 to 12
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 1.0
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.7
Vanadium (V), % 0 to 0.3
0