S32750 and S32760 are both super duplex stainless steels with a PREn (pitting corrosion equivalent) value greater than 40, possessing high strength and excellent resistance to chloride stress corrosion cracking and pitting corrosion. The fundamental difference between the two lies in the alloy design. S32760 is an innovative material developed by optimizing the composition of S32750 by adding tungsten (W) and copper (Cu) elements.
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The Fundamental Material Difference: Alloy Optimization
The foundational difference between S32750 and S32760 lies in the specific addition of alloying stabilizers. UNS S32760 was developed as a specialized optimization of the standard S32750 composition.
While S32750 relies primarily on high levels of Chromium, Nickel, and Molybdenum to fight localized corrosion, S32760 introduces deliberate additions of Tungsten (W) and Copper (Cu). The inclusion of 0.50% to 1.00% Tungsten enhances the alloy's pitting and crevice corrosion resistance, particularly in acidic solutions. Concurrently, the addition of 0.50% to 1.00% Copper significantly improves its structural resistance to strong reducing mineral acids, such as hot sulfuric acid (H2SO4) and hydrochloric acid (HCl).
S32750 and S32760 Chemical Composition Comparison
| Element / Property | S32750 (SAF 2507) | S32760 (Zeron 100/F55) |
|---|---|---|
| Chromium (Cr) | 24.0 - 26.0 % | 24.0 - 26.0 % |
| Nickel (Ni) | 6.0 - 8.0 % | 6.0 - 8.0 % |
| Molybdenum (Mo) | 3.0 - 4.0 % | 3.0 - 4.0 % |
| Nitrogen (N) | 0.24 - 0.32 % | 0.20 - 0.30 % |
| Tungsten (W) | Not specified | 0.50 - 1.00 % |
| Copper (Cu) | Not specified | 0.50 - 1.00 % |
| Carbon (C) | ≤ 0.030 % | ≤ 0.030 % |
| PREN (Typical) | > 40 | ≥ 40 |
S32750 and S32760 Mechanical & Physical Properties Comparison
| Property | S32750 (SAF 2507) | S32760 (Zeron 100/F55) |
|---|---|---|
| Tensile Strength (Rm) | ≥ 800 MPa | 750 - 895 MPa |
| Yield Strength (Rp0.2) | ≥ 550 MPa | ≥ 550 MPa |
| Elongation (A5) | ≥ 15 % | ≥ 25 % |
| Hardness (Brinell) | ≤ 310 HB | ≤ 290 HB |
| Density | ~7.8 g/cm³ | ~7.8 g/cm³ |
| Thermal Conductivity | ~15 W/m·K | ~14 W/m·K |
| Mean Coefficient of Thermal Expansion (20-100°C) | ~12.5 μm/m·°C | ~13.0 μm/m·°C |
| Maximum Recommended Service Temperature (Long-term) | Not recommended above 570°C | ≤ 300°C |
Typical Applications of S32750
Marine engineering: seawater cooling pipes, marine platform fire water pipes (chloride ion concentration ≤ 2000ppm scenario).
Petrochemical industry: conventional sulfur-containing crude oil transportation pipes, inlet and outlet pipes of desulfurization towers (without strong acid media).
Water treatment: municipal sewage treatment plant sludge conveying pipeline, freshwater desalination pretreatment pipeline.
General industry: heat exchanger tube bundle, atmospheric storage tank connection (temperature ≤ 250 ℃).
Typical Applications of S32760
Rigorous chemical industry: sulfuric acid/acetic acid solution delivery pipeline, phenol production unit pipeline (including organic acid scenarios).
High end petroleum: deep-sea oil and gas extraction riser (chloride ion concentration 2000-3000ppm), acid natural gas gathering and transportation pipeline.
Environmental protection field: absorption tower pipeline of flue gas desulfurization (FGD) system (including SO ₂ acidic liquid accumulation).
Special industries: pharmaceutical industry produces chloride ion process tubes, lithium battery materials produce fluoride containing transport tubes (temperature ≤ 280 ℃).
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All products ship with comprehensive Mill Test Certificates (MTC) according to EN 10204 3.1 or 3.2, ensuring absolute quality compliance for international projects. Contact our sales engineers today for project consultations, technical specifications, and fast product quotations. Free material samples are provided upon project evaluation.
