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Inconel 625 is composed of molybdenum and niobium nickel alloy . It has excellent corrosion and oxidation resistance, good tensile and fatigue properties from cryogenic temperatures up to 980°C, and resistance to stress corrosion in salt spray. Therefore, it is widely used in the manufacture of aircraft engine components, aerospace structural components, and chemical equipment. 625 alloy has excellent machining and welding properties. JN can supply plates, bars, tubes, wire, strip, fittings, flanges, and forgings.
US brand: UNSN06625
Chinese brand: GH3625/GH625
French brand: NC22DNb
German brand: W.Nr.2.4856
The key feature of Inconel 625 is its high-temperature stability, maintaining excellent mechanical properties above 800°C. The alloy exhibits excellent resistance to oxidation, corrosion, and fatigue in a variety of harsh environments, particularly in high-temperature, high-pressure, acidic, and alkaline media, often providing long-term reliability and durability.
| Composition | Value |
| C | ≤0.1 |
| Mn | ≤0.5 |
| Si | ≤0.5 |
| S | ≤0.015 |
| Fe | ≤5.0 |
| Ni | 58.0 |
| Cr | 20.0-23.0 |
| Co | ≤1.0 |
| Mo | 8.0-10.0 |
| Cr+Ta | 3.15-4.15 |
| P | ≤0.015 |
| Al | ≤0.4 |
| Properties | Value |
| Tensile Strength | 690MPa |
| Yield Strength | 276MPa |
| Elongation | 30% |
WERKSTOFF NR.: 2.4856
UNS: N06625
JIS: NCF 625
BS: NA21
GOST: ХН75МБТЮ
AFNOR: NC22DNB4M
EN: NiCr22Mo9Nb
Excellent Overall Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, stress corrosion cracking, and corrosion from both oxidizing and reducing media, making it suitable for a wide range of corrosive environments. It is one of the "all-rounders" among corrosion-resistant alloys.
Outstanding High-Temperature Strength: Higher strength, particularly creep strength, than many austenitic stainless steels and earlier nickel-based alloys in the 600°C to 900°C range.
Excellent Oxidation Resistance: Sustains long-term, stable operation in high-temperature air environments.
Good Weldability: Ease of welding, especially its excellent corrosion resistance, greatly simplifies manufacturing and maintenance.
Good Machinability: Compared to more complex precipitation-hardening superalloys, it is relatively easy to hot, cold, and machine.
Good Low-Temperature Toughness: Suitable for cryogenic environments.
Non-Magnetic: Suitable for applications requiring low magnetic permeability.
High Cost: High content of key elements such as nickel, chromium, molybdenum, and niobium results in significantly higher raw material and processing costs than stainless steel, a major limitation.
Relatively Low Room-Temperature Strength: As a solid-solution-strengthened alloy, its room-temperature yield strength of approximately 415 MPa is higher than that of stainless steel but lower than precipitation-hardening superalloys. This makes it less suitable for room-temperature structural parts requiring extremely high strength.
High Work-Hardening Rate: Rapid hardening during cold working requires intermediate annealing or increased working forces, increasing machining difficulty and cost. Its machinability is below average, making it more difficult to machine than austenitic stainless steel.
High-Temperature Endurance/Creep Strength Limit: While exhibiting good high-temperature strength, its endurance and creep strength for long-term use at extremely high temperatures are lower than those of specially designed precipitation-hardening superalloys or oxide-dispersion-strengthened alloys.
High Density: It is heavier than iron-based alloys and stainless steel.
Low Thermal Conductivity: It may not be the best choice for applications requiring good heat dissipation.
| Product | Standards | Show |
| Inconel 625 Bars | ASTM B446 AMS 5666 BS 3076 |  |
| Inconel 625 Sheets | ASTM B443 AMS 5599 Din 17750 |  |
| Inconel 625 Tube | ASTM B444 |  |
| Inconel 625 Pipe | ASTM B705 |  |
| Inconel 625 Fittings | ASTM B366 |  |
| Inconel 625 Forging | ASTM B564 Din 17754 |  |
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.
