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EN 1.4418 Stainless Steel vs. EN 1.4578 Stainless Steel

Both EN 1.4418 stainless steel and EN 1.4578 stainless steel are iron alloys. They have 89% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is EN 1.4418 stainless steel and the bottom bar is EN 1.4578 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 16 to 20
51
Fatigue Strength, MPa 350 to 480
200
Impact Strength: V-Notched Charpy, J 62 to 90
90
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 530 to 620
400
Tensile Strength: Ultimate (UTS), MPa 860 to 1000
550
Tensile Strength: Yield (Proof), MPa 540 to 790
200

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 410
410
Maximum Temperature: Mechanical, °C 870
930
Melting Completion (Liquidus), °C 1450
1430
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 10
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 13
19
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.8
3.7
Embodied Energy, MJ/kg 39
51
Embodied Water, L/kg 130
160

Common Calculations

PREN (Pitting Resistance) 20
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 170
220
Resilience: Unit (Modulus of Resilience), kJ/m3 730 to 1590
100
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 31 to 36
19
Strength to Weight: Bending, points 26 to 28
19
Thermal Diffusivity, mm2/s 4.0
3.9
Thermal Shock Resistance, points 31 to 36
12

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.040
Chromium (Cr), % 15 to 17
16.5 to 17.5
Copper (Cu), % 0
3.0 to 3.5
Iron (Fe), % 73.2 to 80.2
62.3 to 68.5
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0.8 to 1.5
2.0 to 2.5
Nickel (Ni), % 4.0 to 6.0
10 to 11
Nitrogen (N), % 0 to 0.020
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 0.7
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015