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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.

Iron (Fe) 73.2 to 80.2
Chromium (Cr) 15 to 17
Nickel (Ni) 4.0 to 6.0
Molybdenum (Mo) 0.8 to 1.5
Manganese (Mn) 0 to 1.5
Silicon (Si) 0 to 0.7
Carbon (C) 0 to 0.060
Phosphorus (P) 0 to 0.040
Nitrogen (N) 0 to 0.020
Sulfur (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