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EN 1.4618 Stainless Steel vs. EN 1.4408 Stainless Steel

Both EN 1.4618 stainless steel and EN 1.4408 stainless steel are iron alloys. They have a moderately high 91% 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 1.4618 stainless steel and the bottom bar is EN 1.4408 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 210
150
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 51
34
Fatigue Strength, MPa 240 to 250
170
Impact Strength: V-Notched Charpy, J 90 to 91
67
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 680 to 700
510
Tensile Strength: Yield (Proof), MPa 250 to 260
210

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 900
990
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1360
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 13
18
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.7
3.7
Embodied Energy, MJ/kg 39
52
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 19
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 270 to 280
140
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 170
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 25
18
Strength to Weight: Bending, points 22 to 23
18
Thermal Diffusivity, mm2/s 4.0
3.9
Thermal Shock Resistance, points 15 to 16
11

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.070
Chromium (Cr), % 16.5 to 18.5
18 to 20
Copper (Cu), % 1.0 to 2.5
0
Iron (Fe), % 62.7 to 72.5
62.4 to 71
Manganese (Mn), % 5.5 to 9.5
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 2.5
Nickel (Ni), % 4.5 to 5.5
9.0 to 12
Nitrogen (N), % 0 to 0.15
0
Phosphorus (P), % 0 to 0.070
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.010
0 to 0.030