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SAE-AISI 4340M Steel vs. EN 1.4446 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4446 stainless steel are iron alloys. They have 68% 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 1.4446 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
23
Fatigue Strength, MPa 690
160
Impact Strength: V-Notched Charpy, J 18
56
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
79
Tensile Strength: Ultimate (UTS), MPa 2340
490
Tensile Strength: Yield (Proof), MPa 1240
240

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 430
980
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
14
Thermal Expansion, µm/m-K 13
16

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
22
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
4.5
Embodied Energy, MJ/kg 26
60
Embodied Water, L/kg 55
160

Common Calculations

PREN (Pitting Resistance) 2.2
34
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
93
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
17
Strength to Weight: Bending, points 51
17
Thermal Diffusivity, mm2/s 10
3.6
Thermal Shock Resistance, points 70
11

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
59.7 to 66.9
Manganese (Mn), % 0.65 to 0.9
0 to 1.5
Molybdenum (Mo), % 0.35 to 0.45
4.0 to 4.5
Nickel (Ni), % 1.7 to 2.0
12.5 to 14.5
Nitrogen (N), % 0
0.12 to 0.22
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0