EN 1.4618 (X9CrMnNiCu17-8-5-2) Stainless Steel
EN 1.4618 stainless steel is an austenitic stainless steel formulated for primary forming into wrought products. 1.4618 is the EN numeric designation for this material. X9CrMnNiCu17-8-5-2 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 1.4618 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 1.4618 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
200 to 210
Elastic (Young's, Tensile) Modulus
200 GPa 28 x 106 psi
Elongation at Break
51 %
Fatigue Strength
240 to 250 MPa 35 to 37 x 103 psi
Impact Strength: V-Notched Charpy
90 to 91 J 67 ft-lb
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Shear Strength
480 to 500 MPa 70 to 72 x 103 psi
Tensile Strength: Ultimate (UTS)
680 to 700 MPa 98 to 100 x 103 psi
Tensile Strength: Yield (Proof)
250 to 260 MPa 36 to 37 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
410 °C 770 °F
Maximum Temperature: Mechanical
900 °C 1650 °F
Melting Completion (Liquidus)
1400 °C 2560 °F
Melting Onset (Solidus)
1360 °C 2480 °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
13 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
2.7 kg CO2/kg material
Embodied Energy
39 MJ/kg 17 x 103 BTU/lb
Embodied Water
150 L/kg 18 gal/lb
Common Calculations
PREN (Pitting Resistance)
19
Resilience: Ultimate (Unit Rupture Work)
270 to 280 MJ/m3
Resilience: Unit (Modulus of Resilience)
160 to 170 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
24 to 25 points
Strength to Weight: Bending
22 to 23 points
Thermal Diffusivity
4.0 mm2/s
Thermal Shock Resistance
15 to 16 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4618 stainless steel is notable for containing a comparatively high amount of manganese (Mn). Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible.
| Fe | 62.7 to 72.5 | |
| Cr | 16.5 to 18.5 | |
| Mn | 5.5 to 9.5 | |
| Ni | 4.5 to 5.5 | |
| Cu | 1.0 to 2.5 | |
| Si | 0 to 1.0 | |
| N | 0 to 0.15 | |
| C | 0 to 0.1 | |
| P | 0 to 0.070 | |
| S | 0 to 0.010 |
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
Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012
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