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SAE-AISI 4340 Steel vs. EN 1.4421 Stainless Steel

Both SAE-AISI 4340 steel and EN 1.4421 stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 1.4421 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 22
11 to 17
Fatigue Strength, MPa 330 to 740
380 to 520
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
880 to 1100
Tensile Strength: Yield (Proof), MPa 470 to 1150
620 to 950

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 430
870
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
16
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
12
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
2.6
Embodied Energy, MJ/kg 22
36
Embodied Water, L/kg 53
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
120 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
960 to 2270
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
31 to 39
Strength to Weight: Bending, points 22 to 33
26 to 30
Thermal Diffusivity, mm2/s 12
4.4
Thermal Shock Resistance, points 20 to 38
31 to 39

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.060
Chromium (Cr), % 0.7 to 0.9
15.5 to 17.5
Iron (Fe), % 95.1 to 96.3
74.4 to 80.5
Manganese (Mn), % 0.6 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0 to 0.7
Nickel (Ni), % 1.7 to 2.0
4.0 to 5.5
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 0.8
Sulfur (S), % 0 to 0.040
0 to 0.020