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SAE-AISI 4340M Steel vs. EN 1.4905 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4905 stainless steel are iron alloys. They have 90% 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 1.4905 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
19
Fatigue Strength, MPa 690
330
Impact Strength: V-Notched Charpy, J 18
38
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Shear Strength, MPa 1360
460
Tensile Strength: Ultimate (UTS), MPa 2340
740
Tensile Strength: Yield (Proof), MPa 1240
510

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 430
660
Melting Completion (Liquidus), °C 1440
1480
Melting Onset (Solidus), °C 1400
1440
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
26
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
3.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
4.2

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
9.5
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
2.8
Embodied Energy, MJ/kg 26
40
Embodied Water, L/kg 55
90

Common Calculations

PREN (Pitting Resistance) 2.2
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
130
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
680
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
26
Strength to Weight: Bending, points 51
23
Thermal Diffusivity, mm2/s 10
7.0
Thermal Shock Resistance, points 70
25

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Boron (B), % 0
0.00050 to 0.0050
Carbon (C), % 0.38 to 0.43
0.090 to 0.13
Chromium (Cr), % 0.7 to 1.0
8.5 to 9.5
Iron (Fe), % 93.3 to 94.8
86.2 to 88.8
Manganese (Mn), % 0.65 to 0.9
0.3 to 0.6
Molybdenum (Mo), % 0.35 to 0.45
0.9 to 1.1
Nickel (Ni), % 1.7 to 2.0
0.1 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.050 to 0.090
Phosphorus (P), % 0 to 0.012
0 to 0.020
Silicon (Si), % 1.5 to 1.8
0.1 to 0.5
Sulfur (S), % 0 to 0.012
0 to 0.010
Tungsten (W), % 0
0.9 to 1.1
Vanadium (V), % 0.050 to 0.1
0.18 to 0.25