Super Duplex Stainless Steel UNS S32760 (F55 / 1.4501) has excellent corrosion resistance to a wide variety of media, with outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C.
Providing higher strength than both austenitic and 22% Cr Super Duples Stainless Steels UNS S32760 (F55) is suited to a variety of applications in industries such as Chemical Processing, Oil & Gas, and Marine environments.
| Alloy | Common Name | Related Specifications | Tensile Strength | Proof Stress | Elongation |
|---|
| British | European | United States |
|---|
Super Duplex
Alloy S32760 | Zeron 100 | 1.4501 | UNS S32760 | F55 | 750 [109] | 550 [79.8] | 25 |
UNS S32760 Technical Information
| | Specifications of UNS S32760 |
|---|
|
- Alloy 32760 to MLA-MPS-48V-BAR/FORG
- EN 10088-3 1.4501
- ASTM A473 UNS S32760 Forgings
- ASTM A182 Grade F55 UNS S32760 Forged Flanges
- ASTM A240 UNS S32760 Sheet and Plate
- ASTM A479 UNS S32760 Bar
- ASTM A276 UNS S32760 Condition A
- NACE MR 01-75
|
|
| Elements | C | Cr | Cu | Fe | Mo | Mn | N | Ni | P | S | Si | W |
| Minimum | | 24.0 | 0.5 | REMAINDER | 3.0 | | 0.20 | 6.00 | | | | 0.50 |
| Maximum | 0.030 | 26.00 | 1.0 | | 4.0 | 1.0 | 0.30 | 8.00 | 0.030 | 0.010 | 1.00 | 1.00 |
| Basic Properties of UNS S32760- Mechanical Properties |
|---|
|
| 0.2% Proof Stress (N/mm2 ) [ksi] minimum | 550 [79.8] |
| Ultimate Tensile Strength (N/mm2) [ksi] minimum | 750 [108.8]] |
| Elongation (%) minimum | 25 |
| Hardness (HBN) | 270max |
| Reduction of Cross Section Area (%) minimum | 45 |
| Charpy V-notch Impact at ambient Temp (J) [ft.lb] | 80min [59min] |
| Charpy V-notch Impact at -46°C (J) [ft.lb] | 45av, 35min [33av, 25.8min] |
| Additional Testing |
| ASTM G48A Corrosion test at 50°C | No pitting and weight loss <0.8g/m2 |
| Ultrasonic Testing | According to ASTM A388 |
| Ferrite Content | 35%-55% |
| Microstructure | Microstructure certified free from grain boundary carbides, sigma, chi and laves phases |
| Physical Properties of UNS S32760 |
|---|
|
| Density (Kg.m-3) | 7810 |
| Magnetic Permeability | 33 |
| Young’s Modulus (N/mm2) | 199 x 103 |
| Fracture Toughness, KQ (MPa.m½) | 98 |
|
| Specific Heat, 20°C (J.Kg-1.°K-1) | 475 |
| Specific Electrical Resistance, 20°C (µO.m) | 0.80 |
| Thermal conductivity, 20°C (W.m-1.°K-1) | 14.2 |
| Mean coefficient of thermal expansion, 20-100°C (°K-1) | 11.1 x 10-6 |
| Applications of UNS S32760 |
|---|
|
| Chemical Process Industry: |
| Nitric Acid Processes, Polypropylene Production, PVC Production, Dioxide, Caustic Evaporators, Equipment |
| Handling Organic and Fatty Acids |
| |
| Marine Industry and Shipbuilding: |
| Propellers and Shafts, Rudders, Shaft Seals, Pumps, Bolts and Fasteners, Valves, Instrumentation, Oil and Chemical Tankers |
| |
| Oil and Gas Industry: |
| Pumps, Valves, Pipe, Vessels, Wellhead Equipment, Subsea Equipment |
| |
| Pollution Control: |
| Fans and pumps, Wet Scrubbers, Incinerators |
| |
| Pulp and Paper Industry: |
| Black liquor heater tubes, Digester Blow Valves, Rotary Feed Valves, I.D.Fans, Brownstock Washers, Precipitators, Bleaching Components |
| |
| Food Industry: |
| Sugar Cane Centrifuges, Corn and Vegetable processing plant |
| |
| Agrochemicals: |
| Fertiliser Production (Wet phosphoric acid) |
| |
| Civil Engineering: |
| Sewage Treatment |
Super Duplex Plate/Sheet
Super Duplex Seamless & Welded Tube
Super Duplex Seamless & Welded Pipe
Super Duplex Round Bar
Super Duplex Flanges F55/F53
Super Duplex Specialty Forgings
Super Duplex Seamless & Welded BW Fittings
This is a Duplex alloy stainless steel designed to feature high strength, resistance to pitting, stress corrosion cracking, erosion corrosion and corrosion fatigue, crevice corrosion and strong weldability.
Super Duplex Corrosion Resistance
The high chromium and molybdenum content of Super Duplex makes it extremely resistant to uniform corrosion by organic acids like formic and acetic acid. Super Duplex also provides excellent resistance to inorganic acids, especially those containing chlorides.
The pitting Resistance equivalent of Super Duplex, calculated by PREN = Cr + 3.3Mo + 16N, will exceed 40 in most material forms.
Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)
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