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EN 1.4640 (X5CrNiCu19-6-2) Stainless Steel

EN 1.4640 stainless steel is an austenitic stainless steel formulated for primary forming into wrought products. 1.4640 is the EN numeric designation for this material. X5CrNiCu19-6-2 is the EN chemical designation.

It has a fairly high ductility among wrought austenitic stainless steels. In addition, it has a moderately low embodied energy and a moderately low base cost.

The properties of EN 1.4640 stainless steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.4640 stainless steel to: wrought austenitic 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

Brinell Hardness

190 to 200

Elastic (Young's, Tensile) Modulus

200 GPa 28 x 106 psi

Elongation at Break

51 %

Fatigue Strength

230 to 250 MPa 34 to 37 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Shear Strength

440 to 460 MPa 65 to 67 x 103 psi

Tensile Strength: Ultimate (UTS)

620 to 650 MPa 90 to 94 x 103 psi

Tensile Strength: Yield (Proof)

240 to 260 MPa 35 to 37 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

420 °C 780 °F

Maximum Temperature: Mechanical

930 °C 1710 °F

Melting Completion (Liquidus)

1420 °C 2590 °F

Melting Onset (Solidus)

1380 °C 2510 °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

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

14 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

40 MJ/kg 17 x 103 BTU/lb

Embodied Water

150 L/kg 17 gal/lb

Common Calculations

PREN (Pitting Resistance)

20

Resilience: Ultimate (Unit Rupture Work)

250 to 260 MJ/m3

Resilience: Unit (Modulus of Resilience)

150 to 170 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

22 to 23 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

4.0 mm2/s

Thermal Shock Resistance

14 to 15 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4640 stainless steel is notable for containing a comparatively high amount of manganese (Mn) and including copper (Cu). Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible. Copper is used to improve resistance to acids, and to improve formability.

Iron (Fe)Fe 67.4 to 73.6
Chromium (Cr)Cr 18 to 19
Nickel (Ni)Ni 5.5 to 6.9
Manganese (Mn)Mn 1.5 to 4.0
Copper (Cu)Cu 1.3 to 2.0
Silicon (Si)Si 0 to 0.5
Nitrogen (N)N 0.030 to 0.11
Carbon (C)C 0.030 to 0.080
Phosphorus (P)P 0 to 0.045
Sulfur (S)S 0 to 0.015

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

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

Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

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