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SAE-AISI 4340 Steel vs. S32808 Stainless Steel

Both SAE-AISI 4340 steel and S32808 stainless steel are iron alloys. They have 64% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is S32808 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
270
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 12 to 22
17
Fatigue Strength, MPa 330 to 740
350
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
81
Shear Strength, MPa 430 to 770
480
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
780
Tensile Strength: Yield (Proof), MPa 470 to 1150
570

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
14
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
24
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.7
4.0
Embodied Energy, MJ/kg 22
57
Embodied Water, L/kg 53
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
120
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
790
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
27
Strength to Weight: Bending, points 22 to 33
24
Thermal Diffusivity, mm2/s 12
3.8
Thermal Shock Resistance, points 20 to 38
21

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 0.9
27 to 27.9
Iron (Fe), % 95.1 to 96.3
58.1 to 62.8
Manganese (Mn), % 0.6 to 0.8
0 to 1.1
Molybdenum (Mo), % 0.2 to 0.3
0.8 to 1.2
Nickel (Ni), % 1.7 to 2.0
7.0 to 8.2
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.010
Tungsten (W), % 0
2.1 to 2.5