Material to UNS S32760 is described as a super duplex stainless steel with a microstructure of 50:50 austenite and ferrite.
UNS S32760 is a duplex stainless steel especially designed for service in aggressive chloride-containing environments and has additions of W and Cu compared to UNS S32750. It has very good resistance to localized corrosion and stress corrosion cracking in combination with high mechanical strength.
The characteristic features of high strength and corrosion resistance exhibited by the dual microstructure (50% Austenite, 50% Ferrite) associated with Duplex Stainless Steels, are enhanced by a further addition of Chromium (to 25%), and also Tungsten and Copper.
The alloy’s pitting and Crevice Corrosion resistance is better than Standard F51 duplex, The pitting index (PREN) is increased to 40 min from standard F51 Duplex value of 33 min.
Thin sections (Tubulars) are capable of being cold worked to give yield strength of 105 KSI min.
To optimise mechanical properties, avoid clinking, and to avoid deleterious intermetallics within the microstructure; special high temp forming and heat treatment control practices must be followed during processing.
Chemical Composition of S32760
| UNS No | S32750 |
|---|---|
| EN | 1.441 |
| AISI | 2507 |
| Carbon (C) | 0.03 |
| Silicon (Si) | 0.8 |
| Manganese (Mn) | 1.2 |
| Phosphorus (P) | 0.035 |
| Sulphur (S) | 0.02 |
| Chromium (Cr) | 24.0/26.0 |
| Molybdenum (Mo) | 3.0/3.5 |
| Nickel (Ni) | 6.00/8.00 |
| Nitrogen (N) | 0.24/0.32 |
| Other | Cu: 0.50 |
Physical properties of UNS S32760
| Density (Kg/m3) | 7810 |
|---|---|
| Magnetic Permeability (20°C) | 33 |
| Young’s Modulus (kN/mm2) | 199 |
| Specific Electrical Resistance, 20°C (µΩ.m) | 0.8 |
| Mean coefficient of thermal expansion, 20-300°C (m/m/oC) | 11.1 x 10-6 |
| Specific Heat, 20°C (J/kg.K) | 475 |
| Thermal conductivity, 20°C (W/m.K) | 14.2 |
| Fracture Toughness, kQ (MPa/m2) | 98 |
NACE MR0175 limits the supply hardness to 28 HRC max.
Material to UNS S32760 is described as a super duplex stainless steel with a microstructure of 50:50 austenite and ferrite.
The steel combines high mechanical strength (typically up to 600 MPa yield strength) and good ductility with outstanding corrosion resistance to marine environments and a wide, diverse range of oil & gas production environments. The alloy is supplied with a PREN(Pitting Resistance Equivalent) at >= 40.0 which guarantees high resistance to pitting corrosion. In addition, the steel offers high resistance to crevice corrosion and stress corrosion cracking.
Ambient and sub-zero (down to minus 50°C) notch ductility is good. These attributes mean that this super duplex steel can be used successfully as an alternative to 300 series stainless steel (such as type 316), standard 22% Cr duplex steel and precipitation hardening stainless steels. Where appropriate the alloy can be considered in lieu of more costly Grade 5 titanium or nickel based alloys.
Machinability & Welding
The machining and welding of this grade of super duplex stainless steel presents no particular problems. Guidance notes are available upon request.
Technical Assistance
Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.
Typical Applications:
High impact strength at sub-zero temperatures, UNS S32760 displays excellent corrosion resistance.
UNS S32760 is characterized by:
- High resistance to stress corrosion cracking in halide containing environments.
- High resistance to pitting and crevice corrosion.
- High resistance to general corrosion.
- High mechanical strength.
- High resistance to erosion corrosion and corrosion fatigue.
It is widely used in oil & gas, hydropower, pressure vessels, pulp & paper, structural components and chemical tankers.
We offer UNS S32760 Super Duplex Stainless Steel in bar, forgings, sheet, plate, pipe, tube, closed die forgings, flanges and welding consumables.
Processing
We offer processing services throughout the Smiths Group – with more than 30 band saws and a fully automated magazine feed CNC rod blanking line, we can process your material to your exact requirements.
Corrosion resistance
| Material | % Mo | CCCT, °C (°F) | CPT, °C (°F) | PREN |
|---|---|---|---|---|
| 316L | 2.1 | < -2.22 (28) | 20 (68) | 24 |
| 2205 | 3.1 | 20 (68) | 49 (120) | 35 |
| 904L | 4.4 | 24 (75) | 54.4 (130) | 36 |
| UNS S32760 | 3.5 | 42.2 (108) | 82 (180 ) | 41 |
| AL-6XN | 6.2 | 43.3 (110) | 82 (180 ) | 44 |
| 625 | 9 | 45 (113) | - | 51 |
| C22 | 13 | - | - | 64 |
| C-276 | 15.5 | 54.4 (130) | > 103 (217) | 67 |
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