Super Duplex Stainless Steel UNS S32760 (F55 / 1.4501)

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.

AlloyCommon NameRelated SpecificationsTensile StrengthProof StressElongationBritishEuropeanUnited StatesSuper Duplex Alloy S32760Zeron 1001.4501UNS S32760F55750 [109]550 [79.8]25

UNS S32760 Technical InformationSpecifications of UNS S32760

1. Alloy 32760 to MLA-MPS-48V-BAR/FORG

2. EN 10088-3 1.4501

3. ASTM A473 UNS S32760 Forgings

4. ASTM A182 Grade  F55 UNS S32760 Forged Flanges

5. ASTM A240 UNS S32760 Sheet and Plate

6. ASTM A479 UNS S32760 Bar

7. ASTM A276 UNS S32760 Condition A

8. NACE MR 01-75Chemical Specification of UNS S32760

ElementsCCrCuFeMoMnNNiPSSiWMinimum 24.00.5REMAINDER3.0 0.206.00 0.50Maximum0.03026.001.0 4.01.00.308.000.0300.0101.001.00

Basic Properties of UNS S32760- Mechanical Properties

0.2% Proof Stress (N/mm2 ) [ksi] minimum550 [79.8]Ultimate Tensile Strength (N/mm2) [ksi] minimum750 [108.8]]Elongation (%) minimum25Hardness (HBN)270maxReduction of Cross Section Area (%) minimum45Charpy 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 TestingASTM G48A Corrosion test at 50°CNo pitting and weight loss <0.8g/m2Ultrasonic TestingAccording to ASTM A388Ferrite Content35%-55%MicrostructureMicrostructure certified free from grain boundary carbides, sigma, chi and laves phases

 Physical Properties of UNS S32760

Density (Kg.m-3)7810Magnetic Permeability33Young’s Modulus (N/mm2)199 x 103Fracture Toughness, KQ  (MPa.m½)98Specific Heat, 20°C (J.Kg-1.°K-1)475Specific Electrical Resistance, 20°C (µO.m)0.80Thermal conductivity, 20°C (W.m-1.°K-1)14.2Mean 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, EquipmentHandling 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)