Super Duplex Stainless Steel UNS S39274 has become a material of choice across industries requiring exceptional strength, corrosion resistance, and performance under extreme conditions.
Developed to outperform standard duplex grades, UNS S39274 is a high-alloyed super duplex stainless steel combining chromium, molybdenum, and nitrogen in precise ratios.
With enhanced pitting resistance and high mechanical strength, this grade is extensively used in offshore, chemical processing, and desalination applications. If you’re exploring the ideal material for critical environments, understanding the key properties of Super Duplex Stainless Steel UNS S39274 is essential.
Super duplex stainless steel is a type of stainless alloy that features a mixed microstructure of austenite and ferrite, typically in a 50:50 ratio. This dual-phase structure offers a unique combination of high tensile strength and superior resistance to stress corrosion cracking, outperforming standard austenitic and duplex stainless steels.
While conventional duplex grades are suitable for many uses, super duplex stainless steel grades like UNS S39274 and UNS S32760 provide even greater corrosion resistance and mechanical performance in aggressive media such as seawater, acidic slurries, and chloride-rich environments.
UNS S39274 contains a high percentage of chromium (25–27%), molybdenum (3.5–4.5%), and nitrogen (0.3%) to improve its corrosion and pitting resistance. Below is the typical composition chart:
| Element | Content (%) |
|---|---|
| Chromium | 25.0 – 27.0 |
| Nickel | 6.0 – 8.0 |
| Molybdenum | 3.5 – 4.5 |
| Nitrogen | 0.3 max |
| Carbon | 0.03 max |
| Manganese | 1.0 max |
| Silicon | 0.8 max |
| Iron | Balance |
This precise blend delivers an excellent pitting resistance equivalent number (PREN) typically >40, which is considered very high for stainless steels.
| Property | Value |
|---|---|
| Tensile Strength | 750 MPa min |
| Yield Strength (0.2% offset) | 550 MPa min |
| Elongation | 25% min |
| Hardness (Brinell) | ≤ 290 HB |
| Impact Toughness | > 100 J at -50°C |
These mechanical properties ensure structural stability and toughness even in cryogenic and high-pressure applications.
UNS S39274 is often compared with UNS S32760, another widely used super duplex stainless steel grade. While both are designed for high resistance to corrosion, S39274 typically offers slightly better mechanical performance and higher pitting resistance due to its precise alloy composition.
| Grade | PREN Value | Corrosion Resistance | Strength |
|---|---|---|---|
| S39274 | >42 | Very High | Very High |
| S32760 | 41–42 | High | High |
Because of its corrosion resistance and mechanical properties, super duplex stainless steel UNS S39274 is used in:
When sourcing super duplex stainless steel, it’s vital to choose suppliers who provide traceable material certification and consistent quality. Look for suppliers who offer:
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