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Inconel 625(UNS N06625/W.Nr. 2.4856) is a solid solution strengthened superalloy with molybdenum and niobium. Outstanding resistance to pitting, crevice corrosion, impingement corrosion and intergranular attack. Good resistance to mineral acids, such as nitric, phosphoric, sulphuric and hydrochloric acids.
Inconel 625 was developed in the 1960s with the purpose of creating a material that could be used for steam-line piping. Some modifications were made to its original composition that have enabled it to be even more creep-resistant and weldable. Inconel Alloy 625 (UNS designation N06625) is a nickel-based superalloy that possesses high strength properties and resistance to elevated temperatures.
Alloy 625 is a material with excellent resistance to pitting, crevice and corrosion cracking. Highly resistant in a wide range of organic and mineral acids. It has excellent mechanical properties at both extremely low and extremely high temperatures. Outstanding resistance to pitting, crevice corrosion and intercrystalline corrosion. It also demonstrates remarkable protection against corrosion and oxidation. Almost complete freedom from chloride induced stress corrosion cracking. Its ability to withstand high stress and a wide range of temperatures.
Grade | C≤ | Mn≤ | Si≤ | S≤ | Fe≤ | Ni≥ | Cr | Co≤ | Mo | Cr+Ta | P≤ | Al≤ | Ti≤ |
Inconel 625 | 0.10 | 0.50 | 0.5 | 0.015 | 5.0 | 58.0 | 20.0-23.0 | 1.0 | 8.0-10.0 | 3.15-4.15 | 0.015 | 0.4 | 0.4 |
Mechanical properties | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) |
Alloy 625 | 100[690] | 40[276] | 30 |
STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
Inconel 625 | 2.4856 | N06625 | NCF 625 | NA 21 | ХН75МБТЮ | NC22DNB4M | NiCr22Mo9Nb |
Alloy 625 ASTM Specifications
Form | Bar | Sheet/Plate | Tube | Pipe | Fitting | Forging |
Standard | ASTM B466 AMS 5666 BS3076 | ASTM B443 AMS 5599 Din 17750 | ASTM B444 | ASTM B705 | ASTM B366 | ASTM B564 Din 17754 |
Alloy 625 Application：
Components of organic chemical processes containing chlorides, especially where acid chloride catalysts are used.
Digesters and bleaching tanks for the pulp and paper industry.
Absorption tower, reheater, flue gas inlet baffle, fan (humid), agitator, deflector and flue in flue gas desulfurization system.
For the manufacture of equipment and components for use in sour gas environments. For example Acetic acid and acetic anhydride reaction generator.
Sulfuric acid condenser.
