Inconel 625 chemical composition

Inconel 625 physical properties

Density: 8.4 g/cm3

Melting point: 1290-1350°C

Inconel 625 Implementation Standard

Minimum mechanical properties of Inconel 625 alloy at room temperature

This alloy has the following properties:

1. It has excellent corrosion resistance against various corrosive media in oxidizing and reducing environments.

2. Excellent resistance to pitting corrosion and crevice corrosion, and will not produce stress corrosion cracking caused by chloride

3. Excellent resistance to inorganic acid corrosion, such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid and mixed acids of sulfuric acid and hydrochloric acid, etc.

4. Excellent corrosion resistance to various inorganic acid mixed solutions

5. When the temperature reaches 40°C, it can show good corrosion resistance in hydrochloric acid solutions of various concentrations.

6. Good processability and weldability, no post-weld cracking sensitivity

7. Manufacturing certification of pressure vessels with wall temperatures between -196~450C

8. Certified by the NACE standard of the American Society of Corrosion Engineers (MR-01-75 meets the highest standard level VII for use in sour gas environments)

Metallographic structure of Inconel625

625 is a face-centered cubic lattice structure. When kept at about 650°C for a long enough time, carbon particles and unstable quaternary phase will precipitate and transform into a stable Ni3(Nb,t0) oblique lattice phase. After solid solution strengthening, the platinum and nickel components in the nickel-chromium matrix will improve the mechanical properties of the material, but the plasticity will be reduced.

Corrosion resistance of Inconel 625

Alloy 625 shows 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 resistance to alkali and organic acid corrosion in oxidizing and reducing environments. Effective resistance to chloride ion reduction stress corrosion cracking. There is almost no corrosion in seawater and industrial gas environments, and it has high corrosion resistance to seawater and salt solutions, also at high temperatures. No sensitivity during welding. Resistant to carbonization and oxidation in static or cyclic environments, and resistant to corrosion by chlorine-containing gases.

Inconel 625 application areas include:

Low carbon alloy 625 after soft annealing is widely used in the chemical process industry. Its good corrosion resistance and high strength enable it to be used as thin structural components. Alloy 625 can be used in applications where it is exposed to seawater and is subject to high mechanical stress. Typical application areas:

1. Components of organic chemical processes containing chlorides, especially when acidic chloride catalysts are used

2. Digesters and bleaching tanks used in the pulp and paper industry

3. Absorption tower, reheater, flue gas inlet baffle, fan (humidity), agitator, deflector and flue in the flue gas desulfurization system, etc.

4. Used to manufacture equipment and components used in acid gas environments

5. Acetic acid and acetic acid reaction generator

6. Sulfuric acid condenser