Alloy 625，Inconel 625 Tube，UNS N06625，EFORU

British Specs:BS 3072 BS 3073 BS 3074 BS 3075 BS 3076 NA21，American Specs:AMS 5581 Tube AMS 5599 Sheet, Strip and Plate AMS 5666 Bar, Forgings AMS 5869 Sheet, Strip and Plate AMS 5879 Sheet, Strip and Foil AMS 5837 Welding Wire ASTM F3056 Powder AMS 7001 Powder，German Specs:WS 2.4856, AFNOR NC22DNb

### **Product Introduction: Alloy 625 (Inconel 625) Tube // UNS N06625** **Alloy 625** is a nickel-chromium-molybdenum superalloy renowned for its exceptional strength and superior corrosion resistance across a wide temperature range. The alloy's performance is driven by the solid-solution strengthening effect of molybdenum and niobium (columbium) within its nickel-chromium matrix, eliminating the need for precipitation hardening. This makes it exceptionally robust in both high-temperature and corrosive environments. Supplied as **Tubing** (seamless and welded), this product form is engineered for critical applications involving the conveyance of fluids, gases, and use in structural components under extreme pressure, temperature, and corrosive conditions. It is widely known by the trade name **Inconel® 625** and is standardized as **UNS N06625**. --- #### **1. Key Characteristics** * **Exceptional Corrosion Resistance:** Outstanding resistance to a broad spectrum of corrosive media, including pitting, crevice corrosion, and chloride-induced stress-corrosion cracking. * **High Strength at Elevated Temperatures:** Excellent tensile, creep, and rupture strength maintained from cryogenic temperatures up to 1800°F (980°C). * **Superior Oxidation Resistance:** Provides excellent resistance to oxidation and scaling, ideal for high-temperature service. * **Excellent Fabricability and Weldability:** Can be readily formed and welded using standard techniques without post-weld heat treatment to retain corrosion resistance, thanks to its niobium content that prevents sensitization. --- #### **2. Chemical Composition (Typical % Weight)** The composition conforms to major international tube standards. | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | ≥ 58 | **Molybdenum (Mo)** | 8.0 - 10.0 | | **Chromium (Cr)** | 20.0 - 23.0 | **Niobium (Nb) + Tantalum (Ta)** | 3.15 - 4.15 | | **Iron (Fe)** | ≤ 5.0 | **Titanium (Ti)** | ≤ 0.40 | | **Manganese (Mn)**| ≤ 0.50 | **Aluminum (Al)** | ≤ 0.40 | | **Carbon (C)** | ≤ 0.10 | **Silicon (Si)** | ≤ 0.50 | | **Phosphorus (P)**| ≤ 0.015 | **Sulfur (S)** | ≤ 0.015 | --- #### **3. Physical Properties** | Property | English Units | Metric Units | | :--- | :--- | :--- | | **Density** | 0.305 lb/in³ | 8.44 g/cm³ | | **Melting Point** | 2350 - 2460 °F | 1290 - 1350 °C | | **Specific Heat** | 0.094 Btu/lb·°F (70°F) | 394 J/kg·K (21°C) | | **Thermal Conductivity** | 6.0 Btu·in/hr·ft²·°F (70°F) | 8.7 W/m·K (21°C) | | **Thermal Expansion** | 7.1 x 10⁻⁶ in/in/°F (70-600°F) | 12.8 μm/m·K (21-316°C) | | **Modulus of Elasticity** | 30.0 x 10⁶ psi | 207 GPa | --- #### **4. International Standards** Alloy 625 tubes are produced to meet the following key international standards: | Product Form | Standard Specification | Description | | :--- | :--- | :--- | | **Seamless & Welded Tube** | **ASTM B444** | Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy Pipe and Tube | | **Welded Tube** | **ASTM B705** | Standard Specification for Welded Nickel-Chromium-Molybdenum-Columbium Alloy Pipe & Tube | | **Mechanical Tubing** | **ASTM B516** | Standard Specification for Welded Nickel-Chromium-Iron-Molybdenum-Columbium Alloy Tubes | | **Heat-Exchanger Tubing** | **ASTM B167** | Standard Specification for Seamless Nickel-Chromium-Iron-Molybdenum-Columbium Alloy Tubes | | **Europe** | **EN 10269 / DIN 2.4856** | | | **Japan** | **JIS NW6625** | | | **Unified Numbering System** | **UNS N06625** | | --- #### **5. Product Applications** Alloy 625 tubing is specified for the most demanding applications across various industries: * **Oil & Gas (Subsea & Downhole):** * **Umbilicals & Control Lines:** Chemical injection lines and hydraulic tubing. * **Instrumentation Tubing:** For downhole pressure and temperature gauges. * **Heat Exchanger Tubes:** In offshore platform coolers and gas compressors. * **Aerospace & Defense:** * **Hydraulic Line Tubing:** High-pressure fuel, oil, and hydraulic systems in aircraft and engines. * **Engine Tubing:** For bleed air, environmental control systems (ECS), and exhaust components. * **Airframe Components:** Structural tubing in critical locations. * **Chemical & Process Industries:** * **Heat Exchanger & Condenser Tubes:** In shell-and-tube heat exchangers handling corrosive chemicals. * **Process Tubing:** For transporting acids, chlorides, and other aggressive media. * **Catalyst Transfer Lines:** In refinery and chemical processing units. * **Power Generation:** * **Nuclear Power:** Instrumentation tubes, control rod drive mechanism housings, and core internal components. * **Fossil Fuel & Gas Turbines:** High-temperature boiler tubes, superheater tubes, and fuel nozzle lines. * **Marine & Offshore:** * **Seawater Cooling Tubes:** In heat exchangers and condensers. * **Hydraulic Systems:** Tubing for subsea manipulators and valve actuators. * **Industrial Equipment:** * **Furnace Components:** Radiant coils and heat treatment furnace internals. * **Instrumentation Tubing:** For pressure sensors in harsh environments. --- **Note:** *Inconel® is a registered trademark of Special Metals Corporation. The information provided is for reference purposes. Material properties and performance can vary based on size, form, and manufacturing process. For critical applications, always consult the relevant material data sheet and our technical team.*

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 1758 gallon liquid totes Special package is available on request.