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SAE-AISI 4340 Steel vs. S41425 Stainless Steel

Both SAE-AISI 4340 steel and S41425 stainless steel are iron alloys. They have 82% 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 S41425 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
280
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 22
17
Fatigue Strength, MPa 330 to 740
450
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 430 to 770
570
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
920
Tensile Strength: Yield (Proof), MPa 470 to 1150
750

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 430
810
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
16
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
13
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.7
2.9
Embodied Energy, MJ/kg 22
40
Embodied Water, L/kg 53
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
150
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
1420
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
33
Strength to Weight: Bending, points 22 to 33
27
Thermal Diffusivity, mm2/s 12
4.4
Thermal Shock Resistance, points 20 to 38
33

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.050
Chromium (Cr), % 0.7 to 0.9
12 to 15
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 95.1 to 96.3
74 to 81.9
Manganese (Mn), % 0.6 to 0.8
0.5 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
1.5 to 2.0
Nickel (Ni), % 1.7 to 2.0
4.0 to 7.0
Nitrogen (N), % 0
0.060 to 0.12
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.0050