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SAE-AISI 4340 Steel vs. EN 1.4317 Stainless Steel

Both SAE-AISI 4340 steel and EN 1.4317 stainless steel are iron alloys. They have 85% 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 4340 steel and the bottom bar is EN 1.4317 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 22
17
Fatigue Strength, MPa 330 to 740
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
860
Tensile Strength: Yield (Proof), MPa 470 to 1150
630

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 430
770
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
26
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
10
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
2.4
Embodied Energy, MJ/kg 22
33
Embodied Water, L/kg 53
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
130
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
1010
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
31
Strength to Weight: Bending, points 22 to 33
26
Thermal Diffusivity, mm2/s 12
7.0
Thermal Shock Resistance, points 20 to 38
30

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.060
Chromium (Cr), % 0.7 to 0.9
12 to 13.5
Iron (Fe), % 95.1 to 96.3
78.7 to 84.5
Manganese (Mn), % 0.6 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0 to 0.7
Nickel (Ni), % 1.7 to 2.0
3.5 to 5.0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.025