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SAE-AISI 4340M Steel vs. EN 1.4008 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4008 stainless steel are iron alloys. They have 88% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, 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 1.4008 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
17
Fatigue Strength, MPa 690
300
Impact Strength: V-Notched Charpy, J 18
31
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Tensile Strength: Ultimate (UTS), MPa 2340
670
Tensile Strength: Yield (Proof), MPa 1240
500

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
760
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
25
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
8.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
2.1
Embodied Energy, MJ/kg 26
30
Embodied Water, L/kg 55
100

Common Calculations

PREN (Pitting Resistance) 2.2
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
100
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
630
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
24
Strength to Weight: Bending, points 51
22
Thermal Diffusivity, mm2/s 10
6.7
Thermal Shock Resistance, points 70
23

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.1
Chromium (Cr), % 0.7 to 1.0
12 to 13.5
Iron (Fe), % 93.3 to 94.8
81.8 to 86.8
Manganese (Mn), % 0.65 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.35 to 0.45
0.2 to 0.5
Nickel (Ni), % 1.7 to 2.0
1.0 to 2.0
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