What is the material equivalent of 1.4501?
Mar 18, 2026
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Introduction to 1.4501 Stainless Steel
1.4501 stainless steel, widely known by its trade name Zeron 100 (and also as UNS S32760 or F55), is a super duplex stainless steel enhanced with tungsten and copper. It represents the highest echelon of duplex alloys, offering an extraordinary combination of immense strength, exceptional corrosion resistance-especially against pitting and stress corrosion cracking-and improved weldability. The addition of tungsten and copper provides superior performance in aggressive environments, making it the ultimate choice for the most demanding offshore, chemical, and subsea applications.
Specification of 1.4501 stainless steel
Equivalent Grades of 1.4501 stainless steel
| Standard | Grade |
|---|---|
| EN European | 1.4501 / X2CrNiMoCuWN25‑7‑4 |
| ASTM / UNS | F55 / UNS S32760 (Zeron 100) |
| Chinese GB | 022Cr25Ni7Mo4WCuN |
| Common Name | Zeron 100 |
Available forms: seamless & welded tubes, plates, sheets, round bars, forgings, flanges, fittings.
Chemical Composition of 1.4501 stainless steel
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | W | N |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Content | ≤0.030 | ≤1.00 | ≤1.00 | ≤0.035 | ≤0.015 | 24.0‑26.0 | 6.0‑8.0 | 3.0‑4.0 | 0.5‑1.0 | 0.5‑1.0 | 0.20‑0.30 |
PREN ≥41. Ultra‑low carbon; tungsten & copper alloying enhance resistance to pitting, crevice corrosion, stress‑corrosion cracking in chloride‑containing sour‑service environments.
Mechanical Properties of 1.4501 stainless steel
| Property | Value |
|---|---|
| Tensile Strength Rm | 730‑930 MPa |
| 0.2% Offset Yield Strength Rp0.2 | ≥530 MPa |
| Elongation A | ≥25 % |
| Brinell Hardness HBW | ≤290 |
Yield strength is about twice that of 316L austenitic steel. Not hardenable by heat treatment. Avoid long‑term service within 300‑950 ℃ to prevent sigma‑phase embrittlement. Solution annealing range: 1040‑1120 ℃, rapid water quenching required.
Physical Properties (20 ℃) of 1.4501 stainless steel
| Item | Parameter |
|---|---|
| Density | 7.80 g/cm³ |
| Modulus of Elasticity | 200 GPa |
| Coefficient of Linear Expansion | 12.8×10⁻⁶ /℃ (20‑100℃) |
| Thermal Conductivity | 12.8 W/(m·K) |
| Specific Heat Capacity | 460 J/(kg·℃) |
| Melting range | 1400‑1450 ℃ |
| Microstructure | Austenitic‑ferritic duplex, magnetic |
| Max long‑term service temperature | ≤280 ℃ |
Key Characteristicsof 1.4501 stainless steel
Applications of 1.4501 stainless steel
1.Subsea & Offshore: Christmas trees, manifolds, flowlines, risers, and umbilicals in deepwater oil & gas production.
2.Chemical & Process: Reactors, columns, heat exchangers, and piping handling aggressive mixtures of acids, chlorides, and other corrosive media.
3.Pollution Control: FGD scrubbers, absorber towers, and critical ductwork in power plant desulfurization systems.
4.Pulp & Paper: High-pressure and high-temperature digesters and bleaching equipment.
5.Marine Engineering: Propeller shafts, seawater pumps, and valve systems.
6.Desalination: High-pressure piping and evaporator systems.
Offshore platform piping
seawater desalination piping
high‑pressure process piping
Manufacturer Introduction of 1.4501 stainless steel
GNEE is a professional domestic manufacturer engaged in R&D and export of 1.4501 super duplex stainless steel. The whole‑production process strictly complies with international standards including EN, DIN, ASTM and NORSOK. With a complete quality‑control system and flexible delivery options, we accept large‑volume export orders, small‑batch trial orders and custom sample delivery to fully meet the procurement demands of global customers.
Our factory mass‑produces full‑specification profiles, pipes, plates and custom forgings of 1.4501 to satisfy industrial material requirements for diverse application scenarios:
Sheets and strips: Including hot‑rolled plates, cold‑rolled plates, medium‑thick plates, finished steel coils and custom slit strips. Main surface treatments such as NO.1 pickling and shot blasting are available. Deep‑processing services like cut‑to‑size and precision shearing can be provided upon customer requirements.
Bars and profiles: In‑stock items cover hot‑rolled round bars, cold‑drawn bright ground bars, square bars, flat bars and hex bars. Multiple delivery conditions including black surface, rough‑machined and high‑polished finishes are available for various mechanical‑processing scenarios.
Industrial pipes and tubes: We specialize in manufacturing 1.4501 seamless tubes, welded tubes and heat‑exchanger dedicated tubes, which are widely applied in high‑end working conditions such as seawater desalination equipment, sour‑gas transmission pipelines and chemical heat‑exchange systems.
Custom forgings and pipe fittings: Custom‑fabricated forged blanks, flanges, pipe connectors, valve body forgings and other special‑shaped components are available. Personalized processing is supported according to customer drawings and working‑condition parameters.
1.4501 stainless steel polished tubes
1.4501 stainless steel pickled tubes
1.4501 stainless steel plates
FAQ
How does Zeron 100 (1.4501) differ from Super Duplex 2507 (1.4410)?
While both are super duplex grades, Zeron 100 contains additional alloying elements-tungsten (W) and copper (Cu)-that 2507 does not. Tungsten further enhances pitting and crevice corrosion resistance, particularly at elevated temperatures, and improves the stability of the microstructure during welding by retarding the formation of detrimental intermetallic phases. Copper enhances resistance to reducing acids like sulfuric acid. This gives Zeron 100 a performance edge in the most complex and severe corrosive environments, especially those involving both chlorides and acids, or where higher operating temperatures are encountered. It also offers improved toughness at low temperatures and better resistance to sulfide stress cracking in sour service.
What makes welding Zeron 100 different from welding standard duplex steels?
Welding Zeron 100 follows similar principles (controlling heat input, using over-alloyed filler) but benefits from its enhanced composition. The tungsten content helps retard the formation of detrimental intermetallic phases (sigma, chi) in the heat-affected zone (HAZ), providing a wider "processing window" and reducing the risk of embrittlement. Recommended heat input is typically 0.5-2.0 kJ/mm, with interpass temperature below 150°C. Matching filler metals (e.g., Zeron 100X) are available, or over-alloyed nickel-based fillers may be used for highest corrosion resistance. It still requires careful procedure qualification but is generally considered to have better weldability than other super duplex alloys of similar corrosion resistance, making it more forgiving in fabrication.
What industry standards and certifications apply to Zeron 100?
Zeron 100 is approved for use under numerous international standards and by major certification bodies. It meets the requirements of NACE MR0175/ISO 15156 for sour service applications in oil and gas. It is approved for pressure vessel manufacture under ASME Boiler and Pressure Vessel Code (Section VIII, Division 1) and for piping under ASME B31.3. It also meets the requirements of NORSOK M-630 for offshore applications. Material is typically supplied with EN 10204 3.1 certification and can be provided with additional third-party inspections by major classification societies (DNV, ABS, Lloyd's, BV) for marine and offshore applications.
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