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SAE-AISI 4340 Steel vs. EN 1.4901 Stainless Steel

Both SAE-AISI 4340 steel and EN 1.4901 stainless steel are iron alloys. They have 90% 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 4340 steel and the bottom bar is EN 1.4901 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 22
19
Fatigue Strength, MPa 330 to 740
310
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 430 to 770
460
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
740
Tensile Strength: Yield (Proof), MPa 470 to 1150
490

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 430
650
Melting Completion (Liquidus), °C 1460
1490
Melting Onset (Solidus), °C 1420
1450
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
26
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
8.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
11
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.7
2.8
Embodied Energy, MJ/kg 22
40
Embodied Water, L/kg 53
89

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
120
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
620
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 45
26
Strength to Weight: Bending, points 22 to 33
23
Thermal Diffusivity, mm2/s 12
6.9
Thermal Shock Resistance, points 20 to 38
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.0060
Carbon (C), % 0.38 to 0.43
0.070 to 0.13
Chromium (Cr), % 0.7 to 0.9
8.5 to 9.5
Iron (Fe), % 95.1 to 96.3
85.8 to 89.1
Manganese (Mn), % 0.6 to 0.8
0.3 to 0.6
Molybdenum (Mo), % 0.2 to 0.3
0.3 to 0.6
Nickel (Ni), % 1.7 to 2.0
0 to 0.4
Niobium (Nb), % 0
0.040 to 0.090
Nitrogen (N), % 0
0.030 to 0.070
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 0.010
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
1.5 to 2.0
Vanadium (V), % 0
0.15 to 0.25
Zirconium (Zr), % 0
0 to 0.010