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SAE-AISI 4140 Steel vs. EN 1.4107 Stainless Steel

Both SAE-AISI 4140 steel and EN 1.4107 stainless steel are iron alloys. They have 88% of their average alloy composition in common. There are 29 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 4140 steel and the bottom bar is EN 1.4107 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 26
18 to 21
Fatigue Strength, MPa 360 to 650
260 to 350
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
620 to 700
Tensile Strength: Yield (Proof), MPa 590 to 990
400 to 570

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 420
740
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 43
27
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
7.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.1
Embodied Energy, MJ/kg 20
30
Embodied Water, L/kg 51
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
110 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
420 to 840
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 38
22 to 25
Strength to Weight: Bending, points 22 to 30
21 to 22
Thermal Diffusivity, mm2/s 12
7.2
Thermal Shock Resistance, points 20 to 32
22 to 25

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.1
Chromium (Cr), % 0.8 to 1.1
11.5 to 12.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 96.8 to 97.8
83.8 to 87.2
Manganese (Mn), % 0.75 to 1.0
0.5 to 0.8
Molybdenum (Mo), % 0.15 to 0.25
0 to 0.5
Nickel (Ni), % 0
0.8 to 1.5
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.020
Vanadium (V), % 0
0 to 0.080