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AISI 418 Stainless Steel vs. EN 1.8550 Steel

Both AISI 418 stainless steel and EN 1.8550 steel are iron alloys. They have 85% of their average alloy composition in common. There are 32 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 AISI 418 stainless steel and the bottom bar is EN 1.8550 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
300
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
11
Fatigue Strength, MPa 520
470
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 680
600
Tensile Strength: Ultimate (UTS), MPa 1100
1000
Tensile Strength: Yield (Proof), MPa 850
760

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 770
440
Melting Completion (Liquidus), °C 1500
1450
Melting Onset (Solidus), °C 1460
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 25
40
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 15
3.4
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 2.9
1.7
Embodied Energy, MJ/kg 41
23
Embodied Water, L/kg 110
67

Common Calculations

PREN (Pitting Resistance) 19
2.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
100
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
1550
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 38
36
Strength to Weight: Bending, points 29
29
Thermal Diffusivity, mm2/s 6.7
11
Thermal Shock Resistance, points 40
29

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 0.15 to 0.2
0.3 to 0.37
Chromium (Cr), % 12 to 14
1.5 to 1.8
Iron (Fe), % 78.5 to 83.6
94.4 to 96.3
Manganese (Mn), % 0 to 0.5
0.4 to 0.7
Molybdenum (Mo), % 0 to 0.5
0.15 to 0.25
Nickel (Ni), % 1.8 to 2.2
0.85 to 1.2
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.035
Tungsten (W), % 2.5 to 3.5
0