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SAE-AISI 4340M Steel vs. EN 1.4458 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4458 stainless steel are iron alloys. They have 51% 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 1.4458 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
150
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
34
Fatigue Strength, MPa 690
150
Impact Strength: V-Notched Charpy, J 18
67
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Tensile Strength: Ultimate (UTS), MPa 2340
510
Tensile Strength: Yield (Proof), MPa 1240
190

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1370
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
16
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
30
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.9
5.4
Embodied Energy, MJ/kg 26
75
Embodied Water, L/kg 55
200

Common Calculations

PREN (Pitting Resistance) 2.2
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
140
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
89
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
17
Strength to Weight: Bending, points 51
18
Thermal Diffusivity, mm2/s 10
4.2
Thermal Shock Resistance, points 70
12

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 1.0
19 to 22
Copper (Cu), % 0
0 to 2.0
Iron (Fe), % 93.3 to 94.8
40.2 to 53
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
26 to 30
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.012
0 to 0.035
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.025
Vanadium (V), % 0.050 to 0.1
0