EN 1.4374 (X8CrMnNiN18-9-5) Stainless Steel
EN 1.4374 stainless steel is an austenitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the solution annealed (AT) condition. 1.4374 is the EN numeric designation for this material. X8CrMnNiN18-9-5 is the EN chemical designation.
It has a moderately low base cost among wrought austenitic stainless steels. In addition, it has a moderately low embodied energy and a fairly high tensile strength.
The graph bars on the material properties cards below compare EN 1.4374 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
230
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
40 %
Fatigue Strength
340 MPa 50 x 103 psi
Impact Strength: V-Notched Charpy
90 J 67 ft-lb
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Shear Strength
550 MPa 79 x 103 psi
Tensile Strength: Ultimate (UTS)
800 MPa 120 x 103 psi
Tensile Strength: Yield (Proof)
400 MPa 58 x 103 psi
Thermal Properties
Latent Heat of Fusion
290 J/g
Maximum Temperature: Corrosion
410 °C 780 °F
Maximum Temperature: Mechanical
920 °C 1680 °F
Melting Completion (Liquidus)
1400 °C 2550 °F
Melting Onset (Solidus)
1360 °C 2470 °F
Specific Heat Capacity
480 J/kg-K 0.12 BTU/lb-°F
Thermal Conductivity
15 W/m-K 8.6 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.4 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.9 % IACS
Otherwise Unclassified Properties
Base Metal Price
14 % 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
150 L/kg 18 gal/lb
Common Calculations
PREN (Pitting Resistance)
23
Resilience: Ultimate (Unit Rupture Work)
270 MJ/m3
Resilience: Unit (Modulus of Resilience)
400 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
29 points
Strength to Weight: Bending
25 points
Thermal Diffusivity
4.0 mm2/s
Thermal Shock Resistance
17 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4374 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 | 63.5 to 67.9 | |
| Cr | 17.5 to 18.5 | |
| Mn | 9.0 to 10 | |
| Ni | 5.0 to 6.0 | |
| Si | 0.3 to 0.6 | |
| N | 0.25 to 0.32 | |
| Mo | 0 to 0.5 | |
| Cu | 0 to 0.4 | |
| C | 0.050 to 0.1 | |
| P | 0 to 0.035 | |
| S | 0 to 0.030 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016
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 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