Product Code : NI-NI11-CU-CU
Alloy 625,Inconel 625,UNS N06625is available in Bar (Round bar, Flat bar), Ribbon, Wire, Rods, Tube, Pipe, Foil, Plate, Sheet, Strip and Forging Stock.
### **Introduction to Alloy 625 (Inconel 625 / UNS N06625)**
Alloy 625, widely known by its trademark **Inconel 625** and unified numbering system code **UNS N06625**, is a nickel-chromium-molybdenum-niobium superalloy celebrated for its exceptional combination of **high strength, outstanding fatigue and thermal fatigue strength, and superior resistance to a wide range of corrosive environments**. Unlike some alloys that rely solely on precipitation hardening, Alloy 625 derives its remarkable strength from the solid-solution strengthening effect of molybdenum and niobium in its nickel-chromium matrix. This unique mechanism allows it to be used in both annealed and welded conditions without a subsequent age-hardening treatment, offering excellent fabricability and consistent performance. It is a versatile "workhorse" alloy, performing exceptionally well from cryogenic temperatures up to about 1000°C (1800°F), particularly in applications involving pitting, crevice corrosion, and oxidation.
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### **Introduction to Alloy 625 (Inconel 625 / UNS N06625)**
Alloy 625, widely known by its trademark **Inconel 625** and unified numbering system code **UNS N06625**, is a nickel-chromium-molybdenum-niobium superalloy celebrated for its exceptional combination of **high strength, outstanding fatigue and thermal fatigue strength, and superior resistance to a wide range of corrosive environments**. Unlike some alloys that rely solely on precipitation hardening, Alloy 625 derives its remarkable strength from the solid-solution strengthening effect of molybdenum and niobium in its nickel-chromium matrix. This unique mechanism allows it to be used in both annealed and welded conditions without a subsequent age-hardening treatment, offering excellent fabricability and consistent performance. It is a versatile "workhorse" alloy, performing exceptionally well from cryogenic temperatures up to about 1000°C (1800°F), particularly in applications involving pitting, crevice corrosion, and oxidation.
### **Introduction to Alloy 625 (Inconel 625 / UNS N06625)**
Alloy 625, widely known by its trademark **Inconel 625** and unified numbering system code **UNS N06625**, is a nickel-chromium-molybdenum-niobium superalloy celebrated for its exceptional combination of **high strength, outstanding fatigue and thermal fatigue strength, and superior resistance to a wide range of corrosive environments**. Unlike some alloys that rely solely on precipitation hardening, Alloy 625 derives its remarkable strength from the solid-solution strengthening effect of molybdenum and niobium in its nickel-chromium matrix. This unique mechanism allows it to be used in both annealed and welded conditions without a subsequent age-hardening treatment, offering excellent fabricability and consistent performance. It is a versatile "workhorse" alloy, performing exceptionally well from cryogenic temperatures up to about 1000°C (1800°F), particularly in applications involving pitting, crevice corrosion, and oxidation.
--- ### **Chemical Composition**
The outstanding properties of Alloy 625 are a direct result of its precisely balanced chemical composition. The typical composition, as per ASTM/ASME specifications, is outlined below.
| Element | Content (%) (Typical) | Role & Function |
| :--- | :--- | :--- |
| **Nickel (Ni)** | Balance | Forms the austenitic matrix, providing inherent ductility and corrosion resistance. |
| **Chromium (Cr)** | 20.0 - 23.0 | Imparts resistance to oxidation and high-temperature corrosion. |
| **Molybdenum (Mo)** | 8.0 - 10.0 | Provides solid-solution strengthening and exceptional resistance to pitting and crevice corrosion. |
| **Niobium (Nb)** | 3.15 - 4.15 | Acts with carbon to form stable carbides, preventing sensitization. Also contributes significantly to strength through solid-solution hardening. |
| **Iron (Fe)** | ≤ 5.0 | Residual element. |
| **Carbon (C)** | ≤ 0.10 | Forms carbides; controlled to a low level to maintain corrosion resistance. |
| **Manganese (Mn)** | ≤ 0.50 | Aids in deoxidation during melting. |
| **Silicon (Si)** | ≤ 0.50 | Enhances resistance to oxidation. |
| **Phosphorus (P)** | ≤ 0.015 | Residual element (impurity). |
| **Sulfur (S)** | ≤ 0.015 | Residual element (impurity). |
| **Aluminum (Al)** | ≤ 0.40 | Residual element, also contributes to deoxidation. |
| **Titanium (Ti)** | ≤ 0.40 | Residual element. |
--- ### **Physical Properties**
The physical properties of Alloy 625 make it suitable for a wide range of temperatures and applications.
| Property | Value / Condition |
| :--- | :--- |
| **Density** | 8.44 g/cm³ (0.305 lb/in³) |
| **Melting Range** | 1290 - 1350 °C (2350 - 2460 °F) |
| **Specific Heat** | 410 J/kg·K at 20°C |
| **Thermal Conductivity** | 9.8 W/m·K at 100°C |
| **Thermal Expansion** | 12.8 μm/m·K (20 - 100°C) |
| **Electrical Resistivity** | 1.29 μΩ·m at 20°C |
| **Modulus of Elasticity** | 207 GPa (30 x 10⁶ psi) at 21°C |
--- ### **Key Characteristics & Mechanical Properties**
Alloy 625 is renowned for its versatility and robust mechanical performance across a wide temperature spectrum. *
**Excellent Fatigue Strength:** Resists cracking under cyclic loading conditions. *
**Outstanding Corrosion Resistance:** Highly resistant to a broad array of severe corrodents, including chlorides (pitting/crevice), sour gas environments, and acidic media. *
**High Strength without Heat Treatment:** Gains its strength from solid-solution hardening, making it strong and stable in the annealed condition. *
**Good Oxidation Resistance:** Performs well in high-temperature air or oxidizing atmospheres. *
**Superior Weldability:** Can be readily welded by common processes, with welded joints exhibiting strength and corrosion resistance close to the base metal.
**Typical Room Temperature Mechanical Properties (Annealed Condition):** *
**Tensile Strength:** ≥ 827 MPa (120 ksi) *
**Yield Strength (0.2% Offset):** ≥ 414 MPa (60 ksi) *
**Elongation:** ≥ 30%
--- ### **Product Forms and Applications**
Alloy 625 is available in all common industrial product forms, enabling its use in countless applications.
**Product Forms:** *
Plate, Sheet, and Strip *
Bar, Rod, and Wire *
Pipe and Tubing (Seamless & Welded) *
Forgings, Billets, and Fittings *
Welding Consumables (widely used as filler metal 625 for cladding and welding dissimilar metals)
**Applications:** *
**Aerospace:** *
Ducting systems, engine thrust reversers, and spray bars.
* Exhaust and hot air manifold systems.
* Structural components in space vehicles. *
**Marine & Offshore:**
* Propeller blades, submarine auxiliary propulsion motors.
* Seawater piping, heat exchangers, and thrust washers.
* Components for subsea systems requiring high strength and corrosion resistance. *
**Chemical & Process Industries:**
* Vessels, columns, and reactors for aggressive chemical processes.
* Pipe systems for transporting chlorides and acidic chemicals.
* Heat exchanger tubing. *
**Power Generation:**
* SCR systems, reactor core components, and control rod ducting in nuclear plants.
* Gas turbine components and expansion bellows. *
**Oil & Gas:**
* Downhole and surface equipment for sour service (H₂S-containing environments).
* Packers, instrumentation, and control lines.
--- ### **International Standards**
Alloy 625 is covered by a comprehensive set of international standards.
| Product Form | Standard Number | Standard Title / Description |
| :--- | :--- | :--- |
| **Plate, Sheet, Strip** | **ASTM B443** | Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) Plate, Sheet, and Strip |
| **Bar, Rod, Wire** | **ASTM B446** | Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) Rod, Bar, and Wire |
| **Seamless Pipe & Tube** | **ASTM B444** | Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) Pipe and Tube |
| **Welded Tube** | **ASTM B704** | Standard Specification for Welded Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) Tubes |
| **Forgings** | **ASTM B564** | Standard Specification for Nickel Alloy Forgings |
| **Welding Electrodes** | **AWS A5.11 / A5.14** | Specification for Nickel-Alloy Welding Electrodes (ENi6625) & Wire (ERNiCrMo-3) |
| **General Material** | **ASME SB-443** | ASME Boiler and Pressure Vessel Code, Section II (Equivalent to ASTM B443) |
| **Aerospace** | **AMS 5599** | Sheet, Strip, and Plate // **AMS 5666** Bar, Forging, and Ring |
--- ### **Conclusion**
In summary, Alloy 625 (Inconel 625 / UNS N06625) is one of the most versatile and widely used nickel-based superalloys. Its unique solid-solution strengthened nature provides an excellent balance of high strength, outstanding corrosion resistance, and superb fabricability. This combination makes it a default choice for engineers facing the challenges of aggressive chemical environments, high-stress marine applications, and demanding high-temperature aerospace components, ensuring reliability and long service life.
Packing of In summary, Alloy 625 (Inconel 625 / UNS N06625)
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 1634 gallon liquid totes Special package is available on request.
