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Inconel 625 UNS N06625 2.4856 Nickel Alloy

Inconel 625 UNS N06625 2.4856 Nickel Alloy

Inconel 625 UNS N06625 2.4856 Nickel Alloy

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Inconel 625 UNS N06625 2.4856 Nickel Alloy





Chemical Composition




Ni Cr Mo Nb Ta Fe Al Ti C Mn Si Co P S
Min 58.0 20.0 8.0 3.15








Max
23.0 10.0 4.15 5.0 0.40 0.40 0.10 0.50 0.50 1.0 0.015 0.015


Physical properties



■Characteristic



Tensile strength
Rm N/mm²
 Yiield Strength (0.2％ offset)
Rp0.2N/mm²
 Density
 Elongation
A5 ％
 Melting point
(℃)
690
 283
 8.9g/cm³
 40
 1325-1370


Executive Standard


Bar Medium Sheet
 Seamless Tube Welded pipe
ASTM B446 ASTM B443 ASTM B444
 ASTM B705
ASTM B704

Features


1, Excellent corrosion resistance for various corrosive media in oxidizing and reducing environments
2, Excellent resistance to pitting and crevice corrosion, and no stress corrosion cracking due to chloride
3, Excellent resistance to inorganic acid corrosion, such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid, and mixed acid   of sulfuric acid and hydrochloric acid.
4, When the temperature reaches 40 °C, it can show good corrosion resistance in various concentrations of hydrochloric acid solution.
5, Good processability and weldability, no post-weld cracking sensitivity
6, Excellent resistance to corrosion of various inorganic acid mixed solutions
7, Manufacturing certification for pressure vessels with wall temperatures between -196 and 450 °C
8, Certified by the American Society of Corrosion Engineers NACE Standard (MR-01-75) for the highest standards of acid gas use

Corrosion Resistance


625 is a face-centered cubic crystal structure, When held at about 650 ° C for a sufficient period of time, the carbon particles and the unstable quaternary phase are precipitated and converted into a stable Ni 3 (NB, Ti) orthorhombic lattice phase. The molybdenum and niobium components in the nickel-chromium matrix after solid solution strengthening will improve the mechanical properties of the material, but the plasticity will be reduced. Alloy 625 exhibits excellent corrosion resistance in many media. Excellent resistance to pitting, crevice corrosion, intergranular corrosion and erosion in chloride media. It has good resistance to inorganic acid corrosion, such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid, etc., and also has the resistance to alkali and organic acid corrosion in the oxidation and reduction environment, and also at high temperature. No sensitivity during welding. It is resistant to carbonization and oxidation in static or cyclic environments and is resistant to chlorine-containing gases.

Applications


The soft annealed low carbon alloy 625 is widely used in the chemical process industry, with good corrosion resistance and high strength enabling it to be a thin structural component. Alloy 625 can be used in applications where it is exposed to sea water and subjected to high mechanical stresses.

1, Chloride-containing organic chemical process process components, especially where acid chloride catalysts are used
2, Used in the manufacture of digester and bleaching tanks for the pulp and paper industry
3, Absorption tower, reheater, flue gas inlet baffle, fan (wet), agitator, deflector and flue in flue gas desulfurization system
4, Equipment and components used in the manufacture of acid gas environments
5, Acetic acid and acetic anhydride reaction generator
6, Sulfuric acid condenser