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SAE-AISI 4340M Steel vs. EN 1.4404 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4404 stainless steel are iron alloys. They have 72% 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 1.4404 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
190 to 270
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
14 to 43
Fatigue Strength, MPa 690
220 to 320
Impact Strength: V-Notched Charpy, J 18
91 to 93
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Shear Strength, MPa 1360
420 to 550
Tensile Strength: Ultimate (UTS), MPa 2340
600 to 900
Tensile Strength: Yield (Proof), MPa 1240
240 to 570

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 430
950
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
15
Thermal Expansion, µm/m-K 13
16

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
19
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
3.8
Embodied Energy, MJ/kg 26
52
Embodied Water, L/kg 55
150

Common Calculations

PREN (Pitting Resistance) 2.2
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
140 to 800
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
21 to 32
Strength to Weight: Bending, points 51
20 to 26
Thermal Diffusivity, mm2/s 10
4.0
Thermal Shock Resistance, points 70
13 to 20

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 1.0
16.5 to 18.5
Iron (Fe), % 93.3 to 94.8
62.8 to 71.5
Manganese (Mn), % 0.65 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.35 to 0.45
2.0 to 2.5
Nickel (Ni), % 1.7 to 2.0
10 to 13
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.012
0 to 0.045
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.015
Vanadium (V), % 0.050 to 0.1
0