Zeron 100 (UNS S32760 / 1.4501) is a super duplex stainless steel with a balanced 50-50 austenitic-ferritic microstructure . It contains approximately 25% chromium, 7% nickel, 3.6% molybdenum, plus copper (0.5-1.0%) and tungsten (0.5-1.0%) additions . Originally developed as a cast seawater-resistant material for North Sea pump applications, its exceptional performance led to the development of wrought product forms . With a minimum PREn (Pitting Resistance Equivalent) of 40, Zeron 100 offers yield strength twice that of 300 series austenitic stainless steels (≥550 MPa / 80 ksi) .
1. Product Specifications & Physical DataZeron 100 is available in multiple mill forms for oil & gas, marine, and chemical processing applications requiring verified corrosion resistance and high strength. Available Forms: Bar, billet, pipe, tube, plate, sheet, fittings, flanges, welding products Specifications: ASTM A182 Grade F55, ASTM A240, ASTM A276, ASTM A790, UNS S32760, EN 1.4501, NORSOK MDS-D55, NACE MR0175/ISO 15156
| Chemical Composition (Weight %) | UNS S32760 Specification |
|---|
| Chromium (Cr) | 24.0 - 26.0 | | Nickel (Ni) | 6.0 - 8.0 | | Molybdenum (Mo) | 3.0 - 4.0 | | Tungsten (W) | 0.5 - 1.0 | | Copper (Cu) | 0.5 - 1.0 | | Nitrogen (N) | 0.20 - 0.30 | | Carbon (C) | 0.030 max. | | Manganese (Mn) | 1.0 max. | | Silicon (Si) | 1.0 max. | | Iron (Fe) | Balance |
| Physical Properties | Metric | Imperial |
|---|
| Density | 7.80 g/cm³ | 0.282 lb/in³ | | Modulus of Elasticity | 200 GPa | 29.0 × 10⁶ psi | | Thermal Conductivity (RT) | 15 W/m·K | 104 BTU·in/hr·ft²·°F | | Coefficient of Expansion (20-100°C) | 13.0 µm/m·°C | 7.2 µin/in·°F |
| Mechanical Properties (Annealed Plate) | Metric | Imperial |
|---|
| Tensile Strength (min.) | 751 MPa | 109 ksi | | Yield Strength (0.2% offset, min.) | 552 MPa | 80 ksi | | Elongation (min.) | 25% | 25% | | Hardness (Brinell) | 270 max. | 270 max. | | Pitting Resistance Equivalent (PREn) | ≥ 40 | ≥ 40 | | Impact Toughness (Charpy V, -46°C) | 50 J min. | 37 ft·lbf min. |
2. Fabrication & Material ComparisonHeat Treatment: Solution anneal at 1100-1140°C (2012-2084°F), water quench; essential to maintain phase balance (50-50 austenite-ferrite) and prevent sigma phase formation . Welding: Good weldability using GTAW (TIG) with matching Zeron 100X filler metal; low heat input required; preheating not required; post-weld heat treatment not necessary . Forming: Higher strength requires more powerful equipment than austenitic grades; formability slightly lower than 2507 due to higher alloy content . Machining: Higher cutting forces than standard duplex; requires rigid setups, sharp tools, and adequate coolant .
| Material Comparison | Zeron 100 (F55) | 2507 (F53) | 2205 (F51) | 316L |
|---|
| UNS Designation | S32760 | S32750 | S31803/S32205 | S31603 | | EN Designation | 1.4501 | 1.4410 | 1.4462 | 1.4404 | | PREn (min.) | 40 | 40 | 35 | 25 | | Yield Strength (min.) | 550 MPa | 550 MPa | 450 MPa | 170 MPa | | Copper Addition | 0.5-1.0% | — | — | — | | Tungsten Addition | 0.5-1.0% | — | — | — | | H₂S Resistance | Excellent (NACE) | Excellent | Good | Poor | | Seawater Crevice Corrosion | Superior | Superior | Good | Poor | | Sulfuric Acid Resistance | Excellent (with Cu) | Moderate | Moderate | Poor | | Relative Cost | Highest | High | Moderate | Low | | Typical Applications | Subsea, sour gas, acid service | Offshore, desalination | Process piping | General service |
3. ApplicationsOil & Gas: Subsea pipework, risers, manifolds, pressure vessels, valves, heat exchangers, firewater systems, wellhead components (Christmas trees, choke valves) Desalination: High-pressure RO plants, evaporators, brine heaters Marine: Seawater cooling systems, pump components, propeller shafts, offshore platform hardware Chemical Processing: Sulfuric acid handling equipment, reactors, heat exchangers Pollution Control: Flue gas desulfurization (FGD) scrubbers, absorber towers, ducting Pulp & Paper: Bleach plants, digesters, chlorine dioxide service Mining & Metallurgical: Acid leach equipment, steel pickling lines
Specialized Grades Zeron 100FG: Fastener grade cold-drawn round bar with higher strength properties than standard Zeron 100 . Zeron 100AFP: Advanced forging grade for subsea oil and gas applications requiring mechanical properties preserved at temperatures down to -70°C . Zeron 100X: Over-alloyed weld filler metal for welding Zeron 100 to itself and other stainless steels .
Contact ZYTC Alloy for certified UNS S32760 Zeron 100 materials with complete traceability, certificates, NACE MR0175 compliance, and competitive pricing. Available in plate, sheet, bar, pipe, tube, fittings, and welding products for oil & gas, marine, and chemical processing applications. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
