Mirror Surface Nickel Alloy Sheets Duplex S31254 Plate 1-3mm Thickness

Duplex Sheet S31254 1-3mm Thickness Mirror Surface Alloy Steel Plate
 
F44 (UNS S31254) is a super austenitic stainless steel with high Cr, high Mo, and high N. It also has strong corrosion resistance in harsh environments such as high-temperature seawater. Under certain conditions, it has corrosion resistance comparable to Hastelloy and pure titanium, and is an economical stainless steel.

F44 alloy characteristics: High molybdenum content and high chromium and nitrogen content give F44 excellent resistance to pitting corrosion and crevice corrosion. The addition of copper improves corrosion resistance in certain acids. In addition, due to its high nickel content and high chromium and molybdenum content, F44 has good resistance to stress corrosion cracking.

1. A large number of field experiments and extensive use experience have shown that F44 has high crevice corrosion resistance in seawater even at slightly higher temperatures. Only a few types of stainless steel have this performance.
2. The corrosion resistance of F44 in acidic solutions and oxidizing halide solutions such as those required for paper bleaching production is comparable to the most corrosion-resistant nickel-based alloys and titanium alloys.
3. Because F44 has a higher nitrogen content, its mechanical strength is higher than other types of austenitic stainless steel. In addition, F44 has high ductility and impact strength as well as good weldability.
4. The high molybdenum content of F44 allows it to have a higher oxidation rate during annealing, resulting in a rougher surface than ordinary stainless steel after pickling. But this has no adverse effect on the corrosion resistance of the steel.

Metallographic structure of F44:

F44 has a face-centered cubic lattice structure. In order to obtain an austenitic structure, F44 is generally annealed at a temperature of 1150-1200 degrees Celsius. In some cases, there may be traces of metallic intermediate phases (χ and α phases) in the center of the material. But in general, they have no adverse effects on impact strength and corrosion resistance. These phases may precipitate at grain boundaries when placed in the range of 600-1000 degrees Celsius.

Corrosion resistance of F44:

The low carbon content of F44 means that the risk of carbide precipitation due to heating is minimal.The steel can pass the Strauss Test ASTMA262 Procedure E even after one hour of sensitization treatment at 600-1000 degrees Celsius. However, due to the high alloy content of this steel. Within the above temperature range, the metallic intermediate phase may precipitate on the grain boundaries. These precipitates do not put the steel at risk of intergranular corrosion when used in corrosive media. Therefore welding can be performed without intercrystalline corrosion. However, in hot concentrated nitric acid, these precipitates may cause intergranular corrosion in the heat affected zone. In solutions containing ions such as chloride, bromide or iodide, ordinary stainless steels will immediately suffer from localized corrosion in the form of pitting corrosion, crevice corrosion or stress corrosion cracking. In some cases, however, uniform corrosion can be accelerated by the presence of halides. This is especially true when halides are present in non-oxidizing acids.In pure sulfuric acid, F44 has much greater corrosion resistance than 316 ordinary stainless steel. However, at high concentrations, the corrosion resistance of F44 is slightly weaker than that of 904L (NO8904) stainless steel. F44 has the greatest corrosion resistance among sulfuric acids containing chloride ions. Due to the possibility of local corrosion and uniform corrosion, 316 ordinary stainless steel cannot be used in hydrochloric acid, but F44 can be used in dilute hydrochloric acid at normal temperatures. There is no need to worry about pitting corrosion in areas below the boundary line. But efforts must be made to avoid the existence of gaps. In fluorosilicic acid (H2SiF4) and hydrofluoric acid (HF), the corrosion resistance range of ordinary stainless steel is very limited, while F44 can be used in a fairly wide range of concentration and temperature.

F44 application fields:

F44 alloy is a versatile material with applications in many industrial areas:

1. Petroleum and petrochemical equipment, such as bellows in petrochemical equipment.
2. Pulp and paper bleaching equipment, such as pulp digesters, bleaching equipment, barrels and pressure rollers for filter washers, etc.
3. The main parts used in power plant flue gas desulfurization equipment are: the tower body of the absorption tower, the flue, the baffle plate, the internal parts, the spray system, etc.
4. Offshore systems or seawater treatment, such as thin-walled condensation pipes cooled by seawater in power plants, seawater desalination equipment, and can be applied even in equipment where seawater may not flow.
5. Desalination industry, such as salt production or desalination equipment.
6. Heat exchangers, especially heat exchangers in working environments with chloride ions.

DINGSCO

Hunan Dinghan New Material Technology Co., Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications.We are dedicated to providing our customers with best quality products, fastest possible deliveries, most competitive prices of Nickel Based Corrosion Resistant and High Temperature alloys in bars, rods, forged flanges, valve parts (Ball, Stem, Seat Ring, etc), forged shapes (shafts, discs, blocks, hubs, rings, cylinders and other custom shapes) according to ASTM, ASME, API, AMS, NACE and other industry standards.

 
PROFESSIONAL NICKEL ALLOY MANUFACTURER

• Monel, Incoloy, Inconel, Hastelloy
• VIM, ESR, Forging, Heat treatment, Machining
• Round Bar, Ball, Stem, Ring, Flange, etc
• ISO9001, API-6A, API-20B, PED, NORSOK

 
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