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EN 1.4408 Stainless Steel vs. EN 1.4818 Stainless Steel

Both EN 1.4408 stainless steel and EN 1.4818 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a very high 97% 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 1.4408 stainless steel and the bottom bar is EN 1.4818 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
40
Fatigue Strength, MPa 170
280
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 510
700
Tensile Strength: Yield (Proof), MPa 210
330

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 990
1050
Melting Completion (Liquidus), °C 1440
1410
Melting Onset (Solidus), °C 1390
1370
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 18
16
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.7
3.1
Embodied Energy, MJ/kg 52
44
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 26
22
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
230
Resilience: Unit (Modulus of Resilience), kJ/m3 110
270
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
25
Strength to Weight: Bending, points 18
23
Thermal Diffusivity, mm2/s 3.9
4.5
Thermal Shock Resistance, points 11
15

Alloy Composition

Carbon (C), % 0 to 0.070
0.040 to 0.080
Cerium (Ce), % 0
0.030 to 0.080
Chromium (Cr), % 18 to 20
18 to 20
Iron (Fe), % 62.4 to 71
65.6 to 71.8
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 2.0 to 2.5
0
Nickel (Ni), % 9.0 to 12
9.0 to 11
Nitrogen (N), % 0
0.12 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.5
1.0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.015