AFNOR Z1 NCDU 25-20 Stainless Steel Equivalent Material
Leave a message
What is the AFNOR Z1 NCDU 25-20 material?
AFNOR Z1 NCDU 25-20 (commonly designated as 1.4539 or UHB 904L) is a highly alloyed austenitic stainless steel specifically engineered to deliver exceptional corrosion resistance, particularly in acidic environments. Containing high proportions of nickel (24–27%), chromium (19–22%), and molybdenum (4–5%), along with an addition of copper, it is well-suited for applications involving sulfuric and phosphoric acids, offering performance superior to that of standard 316L stainless steel.
What is the equivalent material for Z1 NCDU 25-20 stainless steel?
The primary equivalent material for Z1 NCDU 25-20 (AFNOR NF standard) is AISI 904L, which is commonly designated in European standards as EN 1.4539 or X1NiCrMoCu25-20-5. It is a super-austenitic stainless steel with high resistance to corrosion, particularly in acidic environments.
AISI 904L Chemical Composition
| Element | AFNOR Z1 NCDU 25-20 (Urea Grade) |
| Carbon (C) |
≤ 0.020% |
| Chromium (Cr) | 24.0% – 26.0% |
| Nickel (Ni) | 21.0% – 23.0% |
| Molybdenum (Mo) | 2.0% – 2.5% |
| Nitrogen (N) | 0.10% – 0.16% |
| Manganese (Mn) |
≤ 2.00% |
| Silicon (Si) |
≤ 0.30% |
| Phosphorus (P) |
≤ 0.020% |
| Sulfur (S) |
≤ 0.010% |
AISI 904L Mechanical Properties (at Room Temperature)
| Property | Value (Metric) | Value (Imperial) |
| Tensile Strength (Rm) | 540 – 740 MPa | 78 – 107 ksi |
| Yield Strength (Rp0.2) |
≥ 270 MPa |
≥ 39 ksi |
| Elongation (A5) |
≥ 40% |
≥ 40% |
| Hardness (HBW) |
≤ 190 |
≤ 190 |
| Impact Energy (ISO-V) |
≥ 100 J |
≥ 74 ft-lb |
What is the difference between Z1 NCDU 25-20 and 316L stainless steel?
Z1 NCDU 25-20 performs far better than 316L in acidic and high-chloride environments. It contains more than twice the nickel content of 316L, along with an additional copper component. Due to its high nickel and molybdenum content, the price of Z1 NCDU 25-20 is typically 2 to 3 times that of 316L.
Heat Treatment of AISI 904L Stainless Steel
AISI 904L stainless steel is typically heat-treated via solution annealing at 1090–1175°C (1994–2147°F), followed by rapid water quenching to maximize corrosion resistance. This process dissolves intermetallic phases and restores ductility after, or as an alternative to, cold or hot working. While 904L cannot be hardened by thermal treatment, it is a high-performance alloy requiring specific processing.
Is AISI 904L stainless steel magnetic?
AISI 904L stainless steel is typically non-magnetic in any condition whether annealed, cold-worked, or welded. This characteristic is crucial for specific non-magnetic or electronic applications.
What are the application fields for AISI 904L stainless steel?
Petrochemical Industry: Reactors, heat exchangers, scrubbers.
Pharmaceutical Industry: Centrifuges, reaction vessels.
Fertilizer Industry: Phosphoric acid production equipment.
Paper Industry: Bleaching equipment.
Marine Engineering: Seawater coolers, heat exchangers.
AISI 904L Stainless Steel Price per kg (Latest 2026)
As of early 2026, the price of AISI 904L stainless steel typically ranges between $6.50 and $12.00 per kilogram; market analysis indicates that, for specific product forms, prices generally remain within a relatively stable range of $4.50 to $6.50 per kilogram. Actual prices fluctuate based on factors such as product form, surface finish, and order volume, with the demand for high corrosion resistance serving as the primary driver of market demand.
What are the common supply forms for Z1 NCDU 25-20?
This material can be produced in various forms:
Plates/Sheets
Round Bars
Seamless and Welded Tubes/Pipes
Flanges and Fittings
If you have project needs for 904L stainless steel sheets, please feel free to place an order. GNEE has a large inventory of popular products for your selection. They can be processed in both cold-rolled and hot-rolled forms. For detailed chemical composition and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com
Our Products
Packaging is done with waterproof paper and steel strapping, meeting standard export sea freight packaging requirements, suitable for various modes of transport, or customized according to customer requirements.
Packaging Standard Export Packaging for Stainless Steel Sheets
1. Surface polishing; 2. Strapping packaging;
3. Wooden crate packaging; wooden pallet packaging
4. Container or bulk; 5. Customized according to customer requirements
