INCONEL Alloy 625,，1

### **Product Introduction: INCONEL® Alloy 625 (UNS N06625)** **INCONEL® Alloy 625** is a versatile, nickel-chromium-molybdenum-niobium superalloy renowned for its exceptional combination of **high strength, excellent fatigue resistance, and outstanding corrosion resistance** across a wide temperature range. Unlike many high-strength alloys, Alloy 625 derives its superior mechanical properties not from heat treatment, but from the solid-solution strengthening effects of molybdenum and niobium in its nickel-chromium matrix. This unique characteristic allows it to be used in the annealed condition while maintaining high strength from cryogenic temperatures up to about 1800°F (1000°C). It exhibits exceptional resistance to a broad spectrum of severe corrosive environments, including pitting, crevice corrosion, and oxidation, making it a premier choice for the most demanding applications in aerospace, marine, and chemical processing industries. --- ### **International Standards & Material Equivalents** INCONEL Alloy 625 is standardized across all major international specifications for various product forms. | Standard Type | Standard Number | Title / Product Form | | :--- | :--- | :--- | | **UNS (USA)** | **N06625** | **INCONEL Alloy 625** | | **ASTM** | B443 | Plate, Sheet, and Strip | | **ASTM** | B444 | Seamless Pipe and Tube | | **ASTM** | B446 | Rod and Bar | | **ASME** | SB-443, SB-444, SB-446 | Pressure Vessel Code Editions | | **AMS (Aerospace)** | 5599 | Sheet, Strip, and Plate | | **AMS (Aerospace)** | 5666 | Bar, Forgings, and Ring | | **DIN (Germany)** | 17742 | NiCr22Mo9Nb | | **Werkstoff Nr.** | **2.4856** | **2.4856** | | **AFNOR (France)** | NC22DNB | | > **Note:** INCONEL® is a registered trademark of Special Metals Corporation. The primary identifier is **UNS N06625**. --- ### **Chemical Composition** The composition is precisely balanced to achieve its signature solid-solution strength and corrosion resistance. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 58.0 min. | | **Chromium (Cr)** | 20.0 - 23.0 | | **Molybdenum (Mo)** | 8.0 - 10.0 | | **Niobium (Nb)** | 3.15 - 4.15 | | **Iron (Fe)** | 5.0 max. | | **Aluminum (Al)** | 0.40 max. | | **Titanium (Ti)** | 0.40 max. | | **Carbon (C)** | 0.10 max. | | **Manganese (Mn)** | 0.50 max. | | **Silicon (Si)** | 0.50 max. | | **Phosphorus (P)** | 0.015 max. | | **Sulfur (S)** | 0.015 max. | --- ### **Physical Properties** Alloy 625 possesses physical properties that support its use in extreme thermal and corrosive environments. | Property | Value | | :--- | :--- | | **Density** | 8.44 g/cm³ (0.305 lb/in³) | | **Melting Point** | 1290 - 1350 °C (2350 - 2460 °F) | | **Thermal Conductivity** | 9.8 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.29 μΩ·m (at 20°C) | | **Modulus of Elasticity** | 207 GPa (30 x 10⁶ psi) | | **Coefficient of Thermal Expansion** | 12.8 μm/m·°C (20-100°C) | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties (Typical for Annealed Condition)** The alloy exhibits high strength and good ductility in its standard annealed condition. | Property | Value (Room Temperature, Annealed) | | :--- | :--- | | **Tensile Strength** | 827 MPa (120 ksi) | | **Yield Strength (0.2% Offset)** | 414 MPa (60 ksi) | | **Elongation** | 30% | | **Hardness (Rockwell B)** | 90 HRB | --- ### **Key Characteristics & Advantages** 1. **Exceptional Corrosion Resistance:** Offers outstanding resistance to a wide range of corrosive media, including seawater, brine, acidic and alkaline salts, and oxidizing acids. It is highly resistant to pitting, crevice corrosion, and intergranular attack. 2. **High Strength Without Heat Treatment:** The solid-solution strengthening from molybdenum and niobium provides high strength in the annealed condition, simplifying fabrication. 3. **Excellent Fatigue and Thermal Fatigue Strength:** Performs well under cyclic loading and in applications involving repeated heating and cooling. 4. **Good Oxidation Resistance:** The chromium content provides excellent resistance to scaling and oxidation at high temperatures. 5. **Superior Fabricability and Weldability:** Can be readily welded and fabricated using standard techniques. It is often used as a weld overlay cladding to impart corrosion resistance to less resistant base metals. --- ### **Product Applications** INCONEL Alloy 625 is specified across numerous industries for its reliability and performance. * **Aerospace & Defense:** * **Ducting, exhaust, and thrust-reverser systems** in jet engines. * **Engine firewall seals** and other high-temperature components. * Spacecraft and rocket components. * **Marine Engineering:** * **Propeller blades,** submarine components, and seawater piping. * **Heat exchangers** and condenser pipes for seawater cooling systems. * **Chemical & Process Industries:** * **Reactor vessels, columns, and heat exchangers** for aggressive chemical environments. * Piping systems for acidic gases and sour service in oil and gas production. * **Pollution Control:** * **Flue gas desulfurization (FGD) systems,** scrubbers, and dampers. * **Nuclear Power:** * Core components and control rod ducting. ### **Summary** **INCONEL Alloy 625 (UNS N06625)** is a supremely versatile nickel-based superalloy that delivers an unmatched balance of **high strength, exceptional corrosion resistance, and excellent fabricability**. Its unique solid-solution strengthened nature allows it to perform reliably from cryogenic temperatures up to 1000°C without requiring precipitation hardening heat treatments. Governed by a comprehensive set of international standards like **ASTM B443** and **AMS 5599**, it remains a first-choice material for solving the most complex engineering challenges in aerospace, marine, chemical processing, and energy sectors, where component failure is not an option.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3301 gallon liquid totes Special package is available on request.