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SAE-AISI 4340 Steel vs. EN 1.4568 Stainless Steel

Both SAE-AISI 4340 steel and EN 1.4568 stainless steel are iron alloys. They have 77% 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 SAE-AISI 4340 steel and the bottom bar is EN 1.4568 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 22
2.3 to 21
Fatigue Strength, MPa 330 to 740
220 to 670
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 430 to 770
520 to 930
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
830 to 1620
Tensile Strength: Yield (Proof), MPa 470 to 1150
330 to 1490

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 430
890
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
13
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.7
2.8
Embodied Energy, MJ/kg 22
40
Embodied Water, L/kg 53
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
36 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
290 to 5710
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
30 to 58
Strength to Weight: Bending, points 22 to 33
25 to 40
Thermal Diffusivity, mm2/s 12
4.3
Thermal Shock Resistance, points 20 to 38
23 to 46

Alloy Composition

Aluminum (Al), % 0
0.7 to 1.5
Carbon (C), % 0.38 to 0.43
0 to 0.090
Chromium (Cr), % 0.7 to 0.9
16 to 18
Iron (Fe), % 95.1 to 96.3
70.9 to 76.8
Manganese (Mn), % 0.6 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
6.5 to 7.8
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 0.7
Sulfur (S), % 0 to 0.040
0 to 0.015