EN 1.4658 (X2CrNiMoCoN28-8-5-1) Stainless Steel
EN 1.4658 stainless steel is a duplex stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the solution annealed (AT) condition. 1.4658 is the EN numeric designation for this material. X2CrNiMoCoN28-8-5-1 is the EN chemical designation.
It has a fairly high base cost among wrought duplex stainless steels. In addition, it has a moderately high thermal conductivity and a fairly high embodied energy.
The graph bars on the material properties cards below compare EN 1.4658 stainless steel to: wrought duplex 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
260
Elastic (Young's, Tensile) Modulus
210 GPa 30 x 106 psi
Elongation at Break
28 %
Fatigue Strength
530 MPa 77 x 103 psi
Impact Strength: V-Notched Charpy
110 J 84 ft-lb
Poisson's Ratio
0.27
Shear Modulus
81 GPa 12 x 106 psi
Shear Strength
580 MPa 85 x 103 psi
Tensile Strength: Ultimate (UTS)
900 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
730 MPa 110 x 103 psi
Thermal Properties
Latent Heat of Fusion
300 J/g
Maximum Temperature: Corrosion
460 °C 860 °F
Maximum Temperature: Mechanical
1100 °C 2010 °F
Melting Completion (Liquidus)
1450 °C 2640 °F
Melting Onset (Solidus)
1400 °C 2550 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
16 W/m-K 9.3 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
25 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
4.5 kg CO2/kg material
Embodied Energy
61 MJ/kg 26 x 103 BTU/lb
Embodied Water
200 L/kg 24 gal/lb
Common Calculations
PREN (Pitting Resistance)
49
Resilience: Ultimate (Unit Rupture Work)
240 MJ/m3
Resilience: Unit (Modulus of Resilience)
1280 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
32 points
Strength to Weight: Bending
26 points
Thermal Diffusivity
4.3 mm2/s
Thermal Shock Resistance
24 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4658 stainless steel is notable for including cobalt (Co) and containing a comparatively high amount of chromium (Cr). Cobalt is used to improve mechanical strength at elevated temperatures. Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.
| Fe | 50.9 to 63.7 | |
| Cr | 26 to 29 | |
| Ni | 5.5 to 9.5 | |
| Mo | 4.0 to 5.0 | |
| Co | 0.5 to 2.0 | |
| Mn | 0 to 1.5 | |
| Cu | 0 to 1.0 | |
| N | 0.3 to 0.5 | |
| Si | 0 to 0.5 | |
| P | 0 to 0.035 | |
| C | 0 to 0.030 | |
| S | 0 to 0.010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
Duplex Stainless Steels, Iris Alvarez-Armas and Suzanne Degallaix-Moreuil (editors), 2009
Duplex Stainless Steels: Microstructure, Properties and Applications, Robert N. Gunn (editor), 1997
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
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010