EN 1.4418 (X4CrNiMo16-5-1) Stainless Steel
EN 1.4418 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. 1.4418 is the EN numeric designation for this material. X4CrNiMo16-5-1 is the EN chemical designation.
It has a fairly low electrical conductivity among wrought martensitic stainless steels. In addition, it has a fairly low thermal conductivity and a fairly high base cost.
The properties of EN 1.4418 stainless steel include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.4418 stainless steel to: wrought martensitic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
16 to 20 %
Fatigue Strength
350 to 480 MPa 50 to 70 x 103 psi
Impact Strength: V-Notched Charpy
62 to 90 J 45 to 67 ft-lb
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Shear Strength
530 to 620 MPa 77 to 89 x 103 psi
Tensile Strength: Ultimate (UTS)
860 to 1000 MPa 120 to 150 x 103 psi
Tensile Strength: Yield (Proof)
540 to 790 MPa 78 to 120 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
410 °C 760 °F
Maximum Temperature: Mechanical
870 °C 1600 °F
Melting Completion (Liquidus)
1450 °C 2630 °F
Melting Onset (Solidus)
1400 °C 2550 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
15 W/m-K 8.7 BTU/h-ft-°F
Thermal Expansion
10 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.5 % IACS
Otherwise Unclassified Properties
Base Metal Price
13 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
39 MJ/kg 17 x 103 BTU/lb
Embodied Water
130 L/kg 15 gal/lb
Common Calculations
PREN (Pitting Resistance)
20
Resilience: Ultimate (Unit Rupture Work)
130 to 170 MJ/m3
Resilience: Unit (Modulus of Resilience)
730 to 1590 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
31 to 36 points
Strength to Weight: Bending
26 to 28 points
Thermal Diffusivity
4.0 mm2/s
Thermal Shock Resistance
31 to 36 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4418 stainless steel is notable for containing comparatively high amounts of nickel (Ni) and chromium (Cr). Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion. Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.
| Fe | 73.2 to 80.2 | |
| Cr | 15 to 17 | |
| Ni | 4.0 to 6.0 | |
| Mo | 0.8 to 1.5 | |
| Mn | 0 to 1.5 | |
| Si | 0 to 0.7 | |
| C | 0 to 0.060 | |
| P | 0 to 0.040 | |
| N | 0 to 0.020 | |
| S | 0 to 0.015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10272: Stainless steel bars for pressure purposes
EN 10250-4: Open die steel forgings for general engineering purposes - Part 4: Stainless steels
EN 10088-2: Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes
EN 10088-3: Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes
EN 10088-1: Stainless steels - Part 1: List of stainless steels
Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010