Inconel 625 (UNS N06625) is a solid solution strengthened nickel-based wrought superalloy with molybdenum (Mo) and niobium (Nb) as the main strengthening elements. It is renowned as a "corrosion nemesis" due to its excellent mechanical properties maintained over an extremely wide temperature range of -196℃ to 980℃, as well as its unparalleled corrosion resistance, making it a star material in aerospace, marine engineering, and chemical industries.
Core Characteristics
Excellent Corrosion Resistance: It exhibits extremely strong resistance to both oxidizing and reducing environments, excellent resistance to pitting and crevice corrosion, and does not suffer from stress corrosion cracking caused by chlorides. It performs exceptionally well in inorganic acids such as nitric acid, phosphoric acid, sulfuric acid, and hydrochloric acid.
High Strength over a Wide Temperature Range: It possesses good tensile and fatigue properties from low to high temperatures. At room temperature, the annealed tensile strength can reach over 827 MPa, the yield strength over 414 MPa, and the elongation over 30%.
Excellent weldability: It has good processing and welding properties, maintains its performance without post-weld heat treatment, has no sensitivity to post-weld cracking, and is easy to manufacture complex structures.
Physical Properties
Density: 8.44 g/cm³
Melting Point: 1290-1350 ℃
Thermal Conductivity: 12.1 W/m·K (100℃)
Coefficient of Linear Expansion: 12.3×10⁻⁶/℃ (20-100℃)
Elements
Ni
Cr
Mo
Nb
Fe
C
Mn
Si
P
S
Al
Ti
Standard
≥58.0
20.0-23.0
8.0-10.0
3.15-4.15
≤5.0
≤0.10
≤0.50
≤0.50
≤0.015
≤0.015
≤0.40
≤0.40
This alloy possesses the following characteristics:
1. Excellent corrosion resistance to various corrosive media in both oxidizing and reducing environments.
2. Excellent resistance to pitting and crevice corrosion, and does not exhibit stress corrosion cracking due to chlorides.
3. Excellent resistance to inorganic acid corrosion, such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid, and mixtures of sulfuric and hydrochloric acids.
4. Excellent resistance to corrosion from various mixed solutions of inorganic acids.
5. Exhibits excellent corrosion resistance in hydrochloric acid solutions of various concentrations at temperatures up to 40°C.
6. Good machinability and weldability, with no susceptibility to post-weld cracking.
7. Certified for manufacturing pressure vessels with wall temperatures ranging from -196°C to 450°C.
8. Certified by the American Society of Corrosion Engineers (NACE) standard (MR-01-75) to meet the highest standard level VII for use in acidic gas environments.
Metallological structure of Inconel 625: 625 has a face-centered cubic lattice structure. When held at approximately 650℃ for a sufficient time, carbon particles and unstable quaternary phases will precipitate and transform into a stable Ni3(Nb,Ti) orthorhombic lattice phase. After solid solution strengthening, the molybdenum and niobium components in the nickel-chromium matrix will improve the material's mechanical properties, but its plasticity will decrease somewhat.
Inconel 625's corrosion resistance: Alloy 625 exhibits excellent corrosion resistance in many media. It demonstrates 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, and hydrochloric acid, and also exhibits resistance to alkali and organic acid corrosion in oxidizing and reducing environments.
It effectively resists chloride ion reducing stress corrosion cracking. It exhibits almost no corrosion in seawater and industrial gas environments, and has high corrosion resistance to seawater and salt solutions, even at high temperatures. It is not sensitive to welding. It exhibits resistance to carburization and oxidation in static or cyclic environments and is resistant to chloride-containing gas corrosion.
Inconel 625 Applications: The softened and annealed low-carbon alloy 625 is widely used in chemical process industries. Its good corrosion resistance and high strength allow it to be used as thinner structural components.
625 alloy can be used in applications involving contact with seawater and high mechanical stress. Typical applications include:
1. Components in organic chemical processes containing chlorides, especially when using acidic chloride catalysts.
2. Distillers and bleaching tanks in the pulp and paper industry.
3. Absorbers, reheaters, flue gas inlet dampers, fans (wet), agitators, baffles, and flues in flue gas desulfurization systems.
4. Equipment and components used in acidic gas environments.
5. Acetic acid and acetic anhydride generators.
6. Sulfuric acid condensers.
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