Super Duplex S32760 Stainless Steel
S32760 is a highly alloyed super duplex stainless steel with a ferritic-austenitic microstructure consisting of roughly 40-50% ferrite in the annealed condition, offering the high strength of a ferritic grade while preserving the corrosion resistance of an austenitic grade.
S32760 super duplex stainless steel has high strength, superior chloride corrosion resistance, high thermal conductivity, and a low coefficient of thermal expansion. Its high chromium, molybdenum, and nitrogen content make it very resistant to pitting, crevice corrosion, and other forms of corrosion. S32760 duplex steel resists sulfide stress corrosion cracking in acidic gas conditions and is resistant to a wide range of inorganic and organic acids, while its additional copper element provides good resistance to non-oxidizing acid corrosion. S32760 is also resistant to strong alkali corrosion; however, it is not appropriate for use at long-term working temperatures beyond 300 °C since the material's hardness drops dramatically above this temperature.
The impact energy of S32760 duplex stainless steel drops only marginally with decreasing temperature, despite its high impact strength and lack of a ductile-brittle transition. S32760's impact strength is just marginally decreased when welded. S32760 possesses great mechanical strength and ductility at both atmospheric and subzero temperatures, and it is mostly employed in corrosive conditions.
Chemical Composition (%) of Super Duplex S32760 Stainless Steel
| CHEMICAL COMPOSITION (%) | ||||||||||
| C, max | Mn, max | P, max | S, max | Si, max | Cr | Ni | Mo | N | Cu | W |
| 0.03 | 1.00 | 0.030 | 0.010 | 1.00 | 24.00-26.00 | 6.00-8.00 | 3.00-4.00 | 0.20-0.30 | 0.50-1.00 | 0.50-1.00 |
Mechanical Properties of Super Duplex S32760 Stainless Steel
| MECHANICAL PROPERTIES | |||||
| Tensile Strength, MPa, min | Yield Strength, MPa, min | Elongation (%), min | Hardness, max | ||
| 750 | 550 | 25 | 227 HBW | 29 HRB | 24 HRC |
Physical Properties of Super Duplex S32760 Stainless Steel
| PHYSICAL PROPERTIES | |||||||
| Density | Melting Point | Modulus of Elasticity | Poisson's Ratio | Coefficient of Thermal Expansion | Thermal Conductivity | Electrical Conductivity | Electrical Resistivity |
| 7.9 g/cm³ | 1400-1450℃ | 200 GPa | 0.27 | 13 µm/m·K | 15 W/m·K | 2.2% IACS | 90 Ωmm²/m |
Features of Super Duplex S32760 Stainless Steel
- High impact strength
- High mechanical strength
- Good ductility
- Good resistance to atmospheric and seawater corrosion
- Stronger resistance to chloride corrosion
- Lower coefficient of thermal expansion, higher thermal conductivity
- Good resistance to pitting and crevice corrosion
- Good resistance to general corrosion
- Excellent resistance to sulfuric acid
- Good weldability
Applications of Super Duplex S32760 Stainless Steel
S32760 super duplex stainless steel is mainly used in oil and gas, chemical industry, energy, marine, paper, fertilizer, food, and other industries.
- Osmotic desalination and desalination equipment
- Food processing equipment
- High-strength structural parts
- Fasteners for marine engineering
- Conveying pipes for the chemical industry
- Submarine piping
- Pressure vessels
- Flue gas desulfurization device
Equivalent Grades of Super Duplex S32760 Stainless Steel
| Grade | UNS | WERKSTOFF NR. | GB | EN |
| F55 | S32760 | 1.4501 | 022Cr25Ni7Mo4WCUN | X2CrNiMoWN25-7-4 |
