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SAE-AISI 4340M Steel vs. EN 1.4421 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4421 stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 31 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 4340M 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, % 6.0
11 to 17
Fatigue Strength, MPa 690
380 to 520
Impact Strength: V-Notched Charpy, J 18
30 to 67
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Tensile Strength: Ultimate (UTS), MPa 2340
880 to 1100
Tensile Strength: Yield (Proof), MPa 1240
620 to 950

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
870
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
16
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
12
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
2.6
Embodied Energy, MJ/kg 26
36
Embodied Water, L/kg 55
130

Common Calculations

PREN (Pitting Resistance) 2.2
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
960 to 2270
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
31 to 39
Strength to Weight: Bending, points 51
26 to 30
Thermal Diffusivity, mm2/s 10
4.4
Thermal Shock Resistance, points 70
31 to 39

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.060
Chromium (Cr), % 0.7 to 1.0
15.5 to 17.5
Iron (Fe), % 93.3 to 94.8
74.4 to 80.5
Manganese (Mn), % 0.65 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.35 to 0.45
0 to 0.7
Nickel (Ni), % 1.7 to 2.0
4.0 to 5.5
Phosphorus (P), % 0 to 0.012
0 to 0.035
Silicon (Si), % 1.5 to 1.8
0 to 0.8
Sulfur (S), % 0 to 0.012
0 to 0.020
Vanadium (V), % 0.050 to 0.1
0