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EN 1.4409 Stainless Steel vs. SAE-AISI 4140 Steel

Both EN 1.4409 stainless steel and SAE-AISI 4140 steel are iron alloys. They have 69% of their average alloy composition in common. There are 30 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 EN 1.4409 stainless steel and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
200 to 310
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
11 to 26
Fatigue Strength, MPa 180
360 to 650
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 490
690 to 1080
Tensile Strength: Yield (Proof), MPa 220
590 to 990

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 990
420
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
43
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 19
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.7
1.5
Embodied Energy, MJ/kg 52
20
Embodied Water, L/kg 160
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
74 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 120
920 to 2590
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
25 to 38
Strength to Weight: Bending, points 18
22 to 30
Thermal Diffusivity, mm2/s 4.1
12
Thermal Shock Resistance, points 11
20 to 32

Alloy Composition

Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 18 to 20
0.8 to 1.1
Iron (Fe), % 61.7 to 71
96.8 to 97.8
Manganese (Mn), % 0 to 2.0
0.75 to 1.0
Molybdenum (Mo), % 2.0 to 2.5
0.15 to 0.25
Nickel (Ni), % 9.0 to 12
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 1.5
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.040