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S44401 Stainless Steel vs. SAE-AISI 4340 Steel

Both S44401 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 80% of their average alloy composition in common. There are 30 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 S44401 stainless steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 21
12 to 22
Fatigue Strength, MPa 200
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 300
430 to 770
Tensile Strength: Ultimate (UTS), MPa 480
690 to 1280
Tensile Strength: Yield (Proof), MPa 300
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 930
430
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 22
44
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 12
3.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.9
1.7
Embodied Energy, MJ/kg 40
22
Embodied Water, L/kg 130
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 90
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 230
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
24 to 45
Strength to Weight: Bending, points 18
22 to 33
Thermal Diffusivity, mm2/s 5.9
12
Thermal Shock Resistance, points 17
20 to 38

Alloy Composition

Carbon (C), % 0 to 0.025
0.38 to 0.43
Chromium (Cr), % 17.5 to 19.5
0.7 to 0.9
Iron (Fe), % 75.1 to 80.6
95.1 to 96.3
Manganese (Mn), % 0 to 1.0
0.6 to 0.8
Molybdenum (Mo), % 1.8 to 2.5
0.2 to 0.3
Nickel (Ni), % 0 to 1.0
1.7 to 2.0
Nitrogen (N), % 0 to 0.035
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Titanium (Ti), % 0.2 to 0.8
0