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| Grade | EN | Code | Austenitic Stainless Steel |
| Alloy 926 | 1.4529 | X1NiCrMoCuN25-20-7 |
Alloy 926 (EN 1.4529 / UNS N08926) is a super-austenitic stainless steel developed for service in high-chloride and aggressive chemical environments. In addition to strong general and localized corrosion resistance, it offers high resistance to chloride-induced stress corrosion cracking. Providing performance above 904L, this grade is an economical alternative to more expensive nickel-based alloys in many applications. Its fully austenitic structure allows Alloy 926 to retain good ductility, formability, and weldability.
| C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % | N % | Fe % |
| ≤0.02 | ≤0.50 | ≤2.00 | ≤0.03 | ≤0.01 | 19.00–21.00 | 24.00–26.00 | 6.00–7.00 | 0.50–1.50 | 0.15–0.25 | Bal. |
| Product Form | Rp0.2 [MPa] | Rm [MPa] | Elongation [%] | Hardness [HB] | Density [g/cm³] |
| Bar ≤300 mm | ≥300 | 600–800 | ≥40 | ≤250 | 8.10 |
| Industry | Most Common Products |
| Chemical and petrochemical | Acid piping, process tanks, heat exchangers |
| Oil and gas | Flexible pipes, pump lines, couplings |
| Offshore and marine | Firefighting lines, seawater filters, hydraulic piping systems |
| Desalination and water treatment | Evaporators, seawater piping, heat exchangers |
| Power generation | Condenser tubes, cooling-water lines, heat exchanger tubes |
| Environmental technology and flue-gas treatment | Scrubber components, absorber tanks, gas ducts |
| Pulp and paper | Bleaching tanks, bleaching-plant piping, heat exchangers |
| Salt production | Evaporators, crystallizers, brine piping |
| Mining and hydrometallurgy | Leach tanks, process piping, heat exchangers |
| Food and pharmaceutical | Process tanks, hygienic piping systems, heat exchangers |
Alloy 926 should be selected with attention not only to its high corrosion resistance but also to its behavior during fabrication. Because the material work-hardens rapidly during machining, the cutting tool should not be allowed to dwell on the surface; continuous feed with sufficient depth of cut and rigid machine tools are required. It has good weldability; however, a suitable nickel-based filler metal should be used and excessive heat input should be avoided to preserve corrosion resistance in the weld area. If the material loses strength following heavy forming or incorrect heat treatment, solution annealing should be applied again where required. After welding and fabrication, heat tint should be removed and the surface passivated to obtain the long service life expected from Alloy 926.
Alloy 926, EN 1.4529, DIN/Werkstoff No. 1.4529, X1NiCrMoCuN25-20-7, UNS N08926
| Form | ASTM Specification |
| Bar | ASTM B649 |
254 SMO / F44 – EN 1.4547 / UNS S31254: As a member of the same 6Mo super-austenitic class, it is the closest alternative. It is particularly considered for high-chloride and seawater environments.
AISI 904L – EN 1.4539 / UNS N08904: With lower molybdenum and nitrogen contents, it is a comparatively more economical alternative. It is suitable where the service environment does not require the corrosion resistance level of Alloy 926.
AISI 317 – EN 1.4449 / UNS S31700: It is a lower-tier alternative that may be considered for less aggressive service conditions and where a lower alloy content is acceptable.
VDM Metals – VDM Alloy 926 / Cronifer 1925 hMo
ArcelorMittal Industeel – UR 926
Outokumpu – Ultra 6XN / EN 1.4529 / UNS N08926
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
