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EN 1.4408 Stainless Steel vs. EN 1.4558 Stainless Steel

Both EN 1.4408 stainless steel and EN 1.4558 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have 74% of their average alloy composition in common. There are 31 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 EN 1.4408 stainless steel and the bottom bar is EN 1.4558 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
39
Fatigue Strength, MPa 170
170
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 510
510
Tensile Strength: Yield (Proof), MPa 210
200

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 420
480
Maximum Temperature: Mechanical, °C 990
1100
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1390
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 18
31
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 3.7
5.5
Embodied Energy, MJ/kg 52
77
Embodied Water, L/kg 150
200

Common Calculations

PREN (Pitting Resistance) 26
22
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
160
Resilience: Unit (Modulus of Resilience), kJ/m3 110
100
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
18
Strength to Weight: Bending, points 18
18
Thermal Diffusivity, mm2/s 3.9
3.1
Thermal Shock Resistance, points 11
12

Alloy Composition

Aluminum (Al), % 0
0.15 to 0.45
Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 18 to 20
20 to 23
Iron (Fe), % 62.4 to 71
39.2 to 47.9
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 2.0 to 2.5
0
Nickel (Ni), % 9.0 to 12
32 to 35
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.5
0 to 0.7
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0 to 0.6