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.
| Fe | 67.4 to 73.6 | |
| Cr | 18 to 19 | |
| Ni | 5.5 to 6.9 | |
| Mn | 1.5 to 4.0 | |
| Cu | 1.3 to 2.0 | |
| Si | 0 to 0.5 | |
| N | 0.030 to 0.11 | |
| C | 0.030 to 0.080 | |
| P | 0 to 0.045 | |
| 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