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EN 1.4031 Stainless Steel vs. SAE-AISI 4340 Steel

Both EN 1.4031 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 87% of their average alloy composition in common. There are 30 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 EN 1.4031 stainless steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 13
12 to 22
Fatigue Strength, MPa 220 to 400
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 400 to 540
430 to 770
Tensile Strength: Ultimate (UTS), MPa 670 to 900
690 to 1280
Tensile Strength: Yield (Proof), MPa 390 to 730
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 770
430
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 30
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.1
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.7
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
3.5
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.7
Embodied Energy, MJ/kg 27
22
Embodied Water, L/kg 100
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 94
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 1360
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24 to 32
24 to 45
Strength to Weight: Bending, points 22 to 27
22 to 33
Thermal Diffusivity, mm2/s 8.1
12
Thermal Shock Resistance, points 23 to 32
20 to 38

Alloy Composition

Carbon (C), % 0.36 to 0.42
0.38 to 0.43
Chromium (Cr), % 12.5 to 14.5
0.7 to 0.9
Iron (Fe), % 83 to 87.1
95.1 to 96.3
Manganese (Mn), % 0 to 1.0
0.6 to 0.8
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 0
1.7 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040

Comparable Variants