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EN 1.4317 Stainless Steel vs. AISI 418 Stainless Steel

Both EN 1.4317 stainless steel and AISI 418 stainless steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 31 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 1.4317 stainless steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 17
17
Fatigue Strength, MPa 380
520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Tensile Strength: Ultimate (UTS), MPa 860
1100
Tensile Strength: Yield (Proof), MPa 630
850

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 770
770
Melting Completion (Liquidus), °C 1440
1500
Melting Onset (Solidus), °C 1400
1460
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 26
25
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 2.4
2.9
Embodied Energy, MJ/kg 33
41
Embodied Water, L/kg 110
110

Common Calculations

PREN (Pitting Resistance) 14
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
170
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31
38
Strength to Weight: Bending, points 26
29
Thermal Diffusivity, mm2/s 7.0
6.7
Thermal Shock Resistance, points 30
40

Alloy Composition

Carbon (C), % 0 to 0.060
0.15 to 0.2
Chromium (Cr), % 12 to 13.5
12 to 14
Iron (Fe), % 78.7 to 84.5
78.5 to 83.6
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 0 to 0.7
0 to 0.5
Nickel (Ni), % 3.5 to 5.0
1.8 to 2.2
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5