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SAE-AISI 4718 Steel vs. EN 1.4405 Stainless Steel

Both SAE-AISI 4718 steel and EN 1.4405 stainless steel are iron alloys. They have 80% 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 4718 steel and the bottom bar is EN 1.4405 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 24
17
Fatigue Strength, MPa 270
370
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 510
860
Tensile Strength: Yield (Proof), MPa 370
610

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 420
870
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
17
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.0
13
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
2.8
Embodied Energy, MJ/kg 21
39
Embodied Water, L/kg 51
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
130
Resilience: Unit (Modulus of Resilience), kJ/m3 360
950
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
31
Strength to Weight: Bending, points 18
26
Thermal Diffusivity, mm2/s 10
4.6
Thermal Shock Resistance, points 17
29

Alloy Composition

Carbon (C), % 0.16 to 0.21
0 to 0.060
Chromium (Cr), % 0.35 to 0.55
15 to 17
Iron (Fe), % 96.3 to 97.4
73.6 to 80.3
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.3 to 0.4
0.7 to 1.5
Nickel (Ni), % 0.9 to 1.2
4.0 to 6.0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 0.8
Sulfur (S), % 0 to 0.040
0 to 0.025