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SAE-AISI 4340M Steel vs. EN 1.4578 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4578 stainless steel are iron alloys. They have 70% 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 1.4578 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
51
Fatigue Strength, MPa 690
200
Impact Strength: V-Notched Charpy, J 18
90
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Shear Strength, MPa 1360
400
Tensile Strength: Ultimate (UTS), MPa 2340
550
Tensile Strength: Yield (Proof), MPa 1240
200

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 430
930
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1390
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
2.3
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
3.7
Embodied Energy, MJ/kg 26
51
Embodied Water, L/kg 55
160

Common Calculations

PREN (Pitting Resistance) 2.2
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
220
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
100
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
19
Strength to Weight: Bending, points 51
19
Thermal Diffusivity, mm2/s 10
3.9
Thermal Shock Resistance, points 70
12

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.040
Chromium (Cr), % 0.7 to 1.0
16.5 to 17.5
Copper (Cu), % 0
3.0 to 3.5
Iron (Fe), % 93.3 to 94.8
62.3 to 68.5
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 11
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