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

Both EN 1.4424 stainless steel and SAE-AISI 4340M 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 EN 1.4424 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 15
3.9
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.4
1.9
Embodied Energy, MJ/kg 46
26
Embodied Water, L/kg 140
55

Common Calculations

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

Alloy Composition

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