EN 1.4821 (X15CrNiSi25-4) Stainless Steel
EN 1.4821 stainless steel is a duplex stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the solution annealed (AT) condition. 1.4821 is the EN numeric designation for this material. X15CrNiSi25-4 is the EN chemical designation.
It has a very high thermal conductivity among wrought duplex stainless steels. In addition, it has a fairly low electrical conductivity and a fairly low ductility.
The graph bars on the material properties cards below compare EN 1.4821 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
200
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
18 %
Fatigue Strength
280 MPa 40 x 103 psi
Poisson's Ratio
0.27
Shear Modulus
79 GPa 11 x 106 psi
Shear Strength
450 MPa 65 x 103 psi
Tensile Strength: Ultimate (UTS)
730 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
450 MPa 65 x 103 psi
Thermal Properties
Latent Heat of Fusion
310 J/g
Maximum Temperature: Corrosion
450 °C 830 °F
Maximum Temperature: Mechanical
1100 °C 2010 °F
Melting Completion (Liquidus)
1410 °C 2570 °F
Melting Onset (Solidus)
1370 °C 2490 °F
Specific Heat Capacity
490 J/kg-K 0.12 BTU/lb-°F
Thermal Conductivity
17 W/m-K 9.8 BTU/h-ft-°F
Thermal Expansion
12 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.9 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
15 % relative
Density
7.6 g/cm3 480 lb/ft3
Embodied Carbon
2.9 kg CO2/kg material
Embodied Energy
41 MJ/kg 18 x 103 BTU/lb
Embodied Water
160 L/kg 20 gal/lb
Common Calculations
PREN (Pitting Resistance)
26
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m3
Resilience: Unit (Modulus of Resilience)
500 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
26 points
Strength to Weight: Axial
26 points
Strength to Weight: Bending
23 points
Thermal Diffusivity
4.6 mm2/s
Thermal Shock Resistance
21 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4821 stainless steel is notable for containing comparatively high amounts of chromium (Cr) and silicon (Si). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Silicon content is typically governed by metallurgical processing concerns, but it can also be added for the purpose of improving oxidation resistance.
| Fe | 64.2 to 71.1 | |
| Cr | 24.5 to 26.5 | |
| Ni | 3.5 to 5.5 | |
| Si | 0.8 to 1.5 | |
| Mn | 0 to 2.0 | |
| C | 0.1 to 0.2 | |
| N | 0 to 0.1 | |
| P | 0 to 0.040 | |
| S | 0 to 0.015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10095: Heat resisting steels and nickel alloys
Duplex Stainless Steels, Iris Alvarez-Armas and Suzanne Degallaix-Moreuil (editors), 2009
Duplex Stainless Steels: Microstructure, Properties and Applications, Robert N. Gunn (editor), 1997
Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005
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