Global Alloys supplies all nickel alloys for high-tech uses, in collaboration with leading European steel mills, manufacturers and distributors, we are able to supply every product intended for industries such as: aerospace, aeronautics, defence, racing, energy, oil & gas, plants purification plants and exchangers, petrochemical and chemical plants.
DUPLEX F51
Other specifications:
UNS S31803 – 1.4462 – X2CrNiMoN22.5.3. – F51- UNS S32205 – F60; EN 10204 3.1. NACE MR0175 -NACE MR 0103; Norsok, API 6A
The corrosion resistance of this Duplex F51 steel is much higher than that of Chromium-Nickel-Molybdenum austenitics (316/316L and derivatives), and has a much higher elastic limit; the limitation to the use of steel is its two-phase structure (austenite + ferrite) which is stable up to temperatures of the order of 350 °C. F51 steel has excellent corrosion resistance in acid and chlorinated environments; it is insensitive to intergranular corrosion, and has a high resistance to corrosion under tension (stress corrosion) by virtue of its high elastic limit. The resistance to pitting corrosion is considerable (PREN = approximately 33, compared to a value of approximately 28 of 1.4435 steel, which is a variant of AISI 316L with a higher molybdenum content.
The treatment that gives the steel its optimal properties for use is a solubilization that leads to equilibrium in the structure with a 50% + 50% distribution of austenite and ferrite. To obtain this balance, the steel must be heated up to 1050 ÷ 1100 °C and after maintenance it must be cooled in water or air.
We produce duplex F51 in following forms:
- Rolled and forged round bars
- Custom forged bars
- Perforated bars and sockets
- Drilled rings, molded flanges
- Pipes
MAIN FEATURES:
- Excellent workability
- High resistance to stress corrosion cracking (SCC) in environments with the presence of chlorine
- High resistance to stress corrosion cracking (SCC) in environments containing hydrogen sulphide
- High resistance to general corrosion, pitting and crevice corrosion
- High mechanical strength – approximately double the proof strength of austenitic stainless steels
- High resistance to erosion corrosion and corrosion fatigue
- Good weldability
MAIN APPLICATIONS:
- Process industry components in sulfuric acid, nitric acid, phosphoric acid, ethylene oxide, polypropylene and PVC production
- Equipment for handling organic acids and fatty acids, chemical storage, tankers, heat exchangers
- Marine propellers for the marine industry, shafts, rudders, oil seals, pumps, bolts, fasteners, valves, instrumentation
- Chemical and oil tankers
- Oil and gas pumps, valves, pipes, tanks, well equipment, subsea equipment, separators, heat exchangers
- Pollution control systems, effluent scrubbing, flue gas desulphurisation (FGD)
- Wastewater treatment, acid water purification
- Pulp and paper industry applications such as cellulose liquor heaters, bleach liners, digesters, brownstock washers
Food industry applications including brewery piping, evaporators, hot liquor tanks, presses
