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EN 1.8550 Steel vs. EN 1.4418 Stainless Steel

Both EN 1.8550 steel and EN 1.4418 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.8550 steel and the bottom bar is EN 1.4418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11
16 to 20
Fatigue Strength, MPa 470
350 to 480
Impact Strength: V-Notched Charpy, J 34
62 to 90
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 600
530 to 620
Tensile Strength: Ultimate (UTS), MPa 1000
860 to 1000
Tensile Strength: Yield (Proof), MPa 760
540 to 790

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 440
870
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 40
15
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
2.8
Embodied Energy, MJ/kg 23
39
Embodied Water, L/kg 67
130

Common Calculations

PREN (Pitting Resistance) 2.3
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
130 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
730 to 1590
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 36
31 to 36
Strength to Weight: Bending, points 29
26 to 28
Thermal Diffusivity, mm2/s 11
4.0
Thermal Shock Resistance, points 29
31 to 36

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0 to 0.060
Chromium (Cr), % 1.5 to 1.8
15 to 17
Iron (Fe), % 94.4 to 96.3
73.2 to 80.2
Manganese (Mn), % 0.4 to 0.7
0 to 1.5
Molybdenum (Mo), % 0.15 to 0.25
0.8 to 1.5
Nickel (Ni), % 0.85 to 1.2
4.0 to 6.0
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 0.7
Sulfur (S), % 0 to 0.035
0 to 0.015