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Short Description:
F55 Super Duplex, High performance duplex steel with additions of chromium, molybdenum, and nitrogen for enhanced pitting and crevice corrosion resistance.
Avliable Products: Wire, Pipe, Strip, Sheet, Plate, Flange,Bar
Product Description
F55 containing 25% chromium, 7% nickel, 3.6% molybdenum as well as copper, tungsten and nitrogen, it is a high-pren, high-alloy super duplex stainless steel suitable for corrosive environments. It is a super biphase steel with a ferritic-austenitic microstructure. The alloy is composed of approximately 40-50% ferrite in the annealed state. The super biphase microstructure has the high strength of ferritic steel grades while retaining the corrosion resistance of austenitic steel grades, making it suitable for a variety of applications in industries such as oil and gas, CPI (chemical processing industry) and Marine environments.
- Excellent corrosion resistance in a wide variety of corrosive chemicals
- Pitting Resistance Equivalent number (PREN) of >40
- Outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments
- Critical Pitting Temperature exceeding 50°C
- High strength compared to austenitic and 22%Cr duplex stainless steels
- Excellent ductility and impact strength at both ambient and sub-zero temperatures
- High resistance to abrasion, erosion and cavitation erosion
- Excellent resistance to stress corrosion cracking in chloride containing environments
- Listed in NACE MR 0175 for sour service
- ASME Approval for Pressure Vessel application
Chemical Composition
| C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N | W | PREN | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | 24 | 6 | 3 | 0.5 | 0.2 | 0.5 | 40 | 0 |
| Max | 0.03 | 1 | 1 | 0.03 | 0.01 | 26 | 8 | 4 | 1 | 0.3 | 1 | • | 0 |
Physical Properties
| Youngs Modulus N/mm2 | Density kg/dm³: | Magnetic Permeability |
|---|---|---|
| 199 x 10³ | 7.81 g/cm³ | 33 |
Mechanical Property – Annealed condition
| U.T.S | 0.2% Proof Stress | Elongation | Red of Area | CVN Impacts @ -46°C (-50°F) |
|---|---|---|---|---|
| 109 KSI Min | 80 KSI Min | 25 % | 45 % | 45 Joules |
| (750 N/mm2) | (550 N/mm2) | - | - | (33 ft-lbf) |
F55 Applications
- Process industry components in nitric acid, dioxide, polypropylene & PVC production, caustic evaporators
- Equipment handling organic & fatty acids
- Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation
- Oil and chemical tankers
- Oil & Gas industry pumps, valves, pipe, vessels, wellhead equipment, subsea equipment
- Pollution control systems, fans and pumps, wet scrubbers, incinerators, flue gas desulphurisation (FGD)
- Pulp & paper industry components such as black liquor heater tubes, digester blow valves, rotary feed valves, I.D.fans, brownstock washers, precipitators, bleaching components
- Food Industry applications including sugar cane centrifuges, corn and vegetable processing plant
- Agrochemicals production such as fertilisers (based on wet phosphoric acid)
- Sewage treatment, seawater cooling, desalination plants