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SAE-AISI 4340M Steel vs. EN 1.4423 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4423 stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 32 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 4340M steel and the bottom bar is EN 1.4423 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
17
Fatigue Strength, MPa 690
380
Impact Strength: V-Notched Charpy, J 18
110
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Shear Strength, MPa 1360
520
Tensile Strength: Ultimate (UTS), MPa 2340
850
Tensile Strength: Yield (Proof), MPa 1240
630

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
780
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
16
Thermal Expansion, µm/m-K 13
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
14
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
3.2
Embodied Energy, MJ/kg 26
43
Embodied Water, L/kg 55
120

Common Calculations

PREN (Pitting Resistance) 2.2
21
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
130
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
1000
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
30
Strength to Weight: Bending, points 51
25
Thermal Diffusivity, mm2/s 10
4.3
Thermal Shock Resistance, points 70
31

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.020
Chromium (Cr), % 0.7 to 1.0
11 to 13
Copper (Cu), % 0
0.2 to 0.8
Iron (Fe), % 93.3 to 94.8
73.8 to 80.5
Manganese (Mn), % 0.65 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.35 to 0.45
2.3 to 2.8
Nickel (Ni), % 1.7 to 2.0
6.0 to 7.0
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 0.5
Sulfur (S), % 0 to 0.012
0 to 0.0030
Vanadium (V), % 0.050 to 0.1
0