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SAE-AISI 8740 Steel vs. S32001 Stainless Steel

Both SAE-AISI 8740 steel and S32001 stainless steel are iron alloys. They have 74% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is S32001 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 23
28
Fatigue Strength, MPa 270 to 350
370
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 370 to 400
450
Tensile Strength: Ultimate (UTS), MPa 580 to 670
690
Tensile Strength: Yield (Proof), MPa 380 to 570
510

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
970
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
15
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.6
Embodied Energy, MJ/kg 20
37
Embodied Water, L/kg 50
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
180
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
660
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 20 to 24
25
Strength to Weight: Bending, points 20 to 22
23
Thermal Diffusivity, mm2/s 10
4.0
Thermal Shock Resistance, points 17 to 20
19

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.4 to 0.6
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 96.5 to 97.7
66.6 to 75.5
Manganese (Mn), % 0.75 to 1.0
4.0 to 6.0
Molybdenum (Mo), % 0.2 to 0.3
0 to 0.6
Nickel (Ni), % 0.4 to 0.7
1.0 to 3.0
Nitrogen (N), % 0
0.050 to 0.17
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030