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SAE-AISI 4340M Steel vs. EN 1.4424 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4424 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 33 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 4340M steel and the bottom bar is EN 1.4424 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
230
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
28
Fatigue Strength, MPa 690
350 to 370
Impact Strength: V-Notched Charpy, J 18
90 to 91
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Shear Strength, MPa 1360
520
Tensile Strength: Ultimate (UTS), MPa 2340
800
Tensile Strength: Yield (Proof), MPa 1240
480 to 500

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Maximum Temperature: Mechanical, °C 430
960
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
13
Thermal Expansion, µm/m-K 13
12

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
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.9
3.4
Embodied Energy, MJ/kg 26
46
Embodied Water, L/kg 55
140

Common Calculations

PREN (Pitting Resistance) 2.2
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
190 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
580 to 640
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
29
Strength to Weight: Bending, points 51
25
Thermal Diffusivity, mm2/s 10
3.5
Thermal Shock Resistance, points 70
23

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 1.0
18 to 19
Iron (Fe), % 93.3 to 94.8
68.6 to 72.4
Manganese (Mn), % 0.65 to 0.9
1.2 to 2.0
Molybdenum (Mo), % 0.35 to 0.45
2.5 to 3.0
Nickel (Ni), % 1.7 to 2.0
4.5 to 5.2
Nitrogen (N), % 0
0.050 to 0.1
Phosphorus (P), % 0 to 0.012
0 to 0.035
Silicon (Si), % 1.5 to 1.8
1.4 to 2.0
Sulfur (S), % 0 to 0.012
0 to 0.015
Vanadium (V), % 0.050 to 0.1
0