Nickel Alloy Gasket Rings Inconel 625 Pipeline Components Pipe Flanges UNS NO6625

Nickel Alloy Gasket Rings, A gasket is a type of sealing component used to create a barrier between one mating surface and another to prevent the escape or ingress of fluids or gases. To accommodate these flat surfaces, the gasket can be flat or slightly curved. They can also be cut into different shapes to fit precisely between the surfaces they’re meant to seal. They can even be made to fit complex mating surfaces. When compressed, gaskets fill in any irregularities or imperfections on the mating surfaces to create a seal. Gaskets must be able to withstand the pressure differentials that occur across the sealing interface. They should maintain their ability to provide an effective seal even under high-pressure conditions to prevent leaks and ensure system integrity. Gasket seals are sometimes made of flexible materials, such as nitrile rubber and silicone rubber, but can also be made of metal and composite materials, such as rigid polymers.

Nickel Alloy 625 (UNS NO6625) is a material with excellent resistance to pitting, crevice, and corrosion cracking. This alloy is highly resistant in a wide range oforganic and mineral acids, and it exhibits good hightemperature strength. Excellent mechanical properties at both extremely lowand extremely high temperatures. Outstanding resistance to pitting, crevice corrosion, and intercrysta ine corrosion. Almost complete freedom from chloride induced stress corrosion cracking. High resistance to oxidation at elevated temperaturesup to 1050°C. Good resistance to acids, such as nitric, phosphoricsulfuric, and hydrochloric, as wel as to alkalis makespossible the construction of thin structura parts ofhigh heat transfer.

Fabrication Data:

Alloy 625 can be easily welded and processed by standard shop fabrication practices, however because the high strength of the alloy, it resists deformation at hotworking temperatures. 

• Hot Forming. The hot-working temperature range for Alloy 625 is 1650–2150°F (900–1177°C). Heavy working needs to occur as close to 2150°F (1177°C) as possible, while lighter working can take place down to 1700°F (927°C). Hot-working should occur in uniform reductions to prevent duplex grain structure
• Cold Forming. Alloy 625 can be cold-formed by the standard shop fabrication practices. The alloy should be in the annealed condition. Work hardening rates are higher than the austenitic stainless steels.
• Welding. Alloy 625 can be readily welded by most standard processes including GTAW (TIG), PLASMA, GMAW (MIG/MAG), SAW and SMAW (MMA). A post weld heat treatment is not necessary. Brushing with a stainless steel wire brush after welding will remove the heat tint and produce a surface area that does not require additional pickling.
• Machining. Alloy 625 should preferably be machined in the annealed condition. Since Alloy 625 is prone to workhardening, only low cutting speeds should be used and the cutting tool should be engaged at all times. Adequate cut depth is necessary to assure avoiding contact with the previously formed work-hardened zone.

​Applications:

• Chemical processing equipment handling mixed acids both oxidizing and reducing
•  Seawater applications
• Aircraft ducting systems
• Jet engine exhaust systems
• Turbine shroud rings
• Bellows and expansion joints
• Aircraft exhaust liners and turbine seals
• Nuclear water reaction components

Chemical Composition:

Physical Properties:

Thermal Properties:

Modulus at Elevated Temperatures^a:

Processing Flow Chart: