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EN 1.4634 (X2CrAlSiNb18) Stainless Steel

EN 1.4634 stainless steel is a ferritic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 1.4634 is the EN numeric designation for this material. X2CrAlSiNb18 is the EN chemical designation.

It has a moderately high embodied energy among the wrought ferritic stainless steels in the database.

The graph bars on the material properties cards below compare EN 1.4634 stainless steel to: wrought ferritic 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 28 x 106 psi

Elongation at Break

21 %

Fatigue Strength

180 MPa 27 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Shear Strength

340 MPa 49 x 103 psi

Tensile Strength: Ultimate (UTS)

540 MPa 78 x 103 psi

Tensile Strength: Yield (Proof)

280 MPa 41 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

500 °C 940 °F

Maximum Temperature: Mechanical

900 °C 1650 °F

Melting Completion (Liquidus)

1430 °C 2610 °F

Melting Onset (Solidus)

1390 °C 2530 °F

Specific Heat Capacity

480 J/kg-K 0.12 BTU/lb-°F

Thermal Conductivity

21 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

13 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

2.9 kg CO2/kg material

Embodied Energy

42 MJ/kg 18 x 103 BTU/lb

Embodied Water

140 L/kg 16 gal/lb

Common Calculations

PREN (Pitting Resistance)

19

Resilience: Ultimate (Unit Rupture Work)

93 MJ/m3

Resilience: Unit (Modulus of Resilience)

200 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

5.8 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4634 stainless steel is notable for including aluminum (Al) and niobium (Nb). Aluminum is used to improve oxidation resistance. It can also enhance the effects of heat treatment. Niobium is primarily used to improve yield strength, particularly at elevated temperatures.

Iron (Fe) 74.9 to 81.8
Chromium (Cr) 17.5 to 18.5
Silicon (Si) 0.2 to 1.5
Aluminum (Al) 0.2 to 1.5
Niobium (Nb) 0.3 to 1.0
Manganese (Mn) 0 to 1.0
Nickel (Ni) 0 to 0.5
Molybdenum (Mo) 0 to 0.5
Copper (Cu) 0 to 0.5
Phosphorus (P) 0 to 0.050
Sulfur (S) 0 to 0.050
Carbon (C) 0 to 0.030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10088-2: Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes

Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016

EN 10088-1: Stainless steels - Part 1: List of stainless steels

Corrosion of Stainless Steels, A. John Sedriks, 1996

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010