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EN 1.4418 Stainless Steel vs. EN 1.4458 Stainless Steel

Both EN 1.4418 stainless steel and EN 1.4458 stainless steel are iron alloys. They have 70% 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 1.4418 stainless steel and the bottom bar is EN 1.4458 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 16 to 20
34
Fatigue Strength, MPa 350 to 480
150
Impact Strength: V-Notched Charpy, J 62 to 90
67
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 860 to 1000
510
Tensile Strength: Yield (Proof), MPa 540 to 790
190

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 410
430
Maximum Temperature: Mechanical, °C 870
1100
Melting Completion (Liquidus), °C 1450
1420
Melting Onset (Solidus), °C 1400
1370
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 10
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 13
30
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 2.8
5.4
Embodied Energy, MJ/kg 39
75
Embodied Water, L/kg 130
200

Common Calculations

PREN (Pitting Resistance) 20
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 170
140
Resilience: Unit (Modulus of Resilience), kJ/m3 730 to 1590
89
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31 to 36
17
Strength to Weight: Bending, points 26 to 28
18
Thermal Diffusivity, mm2/s 4.0
4.2
Thermal Shock Resistance, points 31 to 36
12

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.030
Chromium (Cr), % 15 to 17
19 to 22
Copper (Cu), % 0
0 to 2.0
Iron (Fe), % 73.2 to 80.2
40.2 to 53
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
26 to 30
Nitrogen (N), % 0 to 0.020
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.7
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.025