Alloy 725，Inconel 725 Rod，UNS N07725，EFORU

British Specs:，American Specs:ASTM B805，German Specs:

### **Product Introduction: Alloy 725 / Inconel 725 Rod (UNS N07725)** #### **Overview** **Alloy 725 Rod** (commercially known as **Inconel® 725 Rod**) is a premium precipitation-hardenable nickel-chromium-molybdenum-niobium alloy supplied in rod form, specifically engineered for applications requiring exceptional corrosion resistance combined with high strength in severe environments. This advanced superalloy rod offers outstanding performance in corrosive media including sour gas (H₂S-containing) wells, acidic environments, and chloride-containing solutions, while maintaining excellent mechanical properties at temperatures up to 650°C (1200°F). The rod product is manufactured through controlled hot working processes and precise heat treatments to ensure uniform microstructure, consistent mechanical properties, and reliable performance in critical oil and gas, chemical processing, and marine applications. The alloy's enhanced characteristics are achieved through a sophisticated precipitation-hardening mechanism involving gamma prime [γ'] and gamma double prime [γ''] phase formation, providing an optimal balance of strength and corrosion resistance for demanding applications. --- #### **Chemical Composition** The chemical composition of Alloy 725 Rod (UNS N07725) is carefully balanced for optimal performance: | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 55.0 - 59.0 | | **Chromium (Cr)** | 19.0 - 22.5 | | **Molybdenum (Mo)** | 7.0 - 9.5 | | **Iron (Fe)** | 5.0 - 9.0 | | **Niobium (Nb)** | 2.75 - 4.00 | | **Titanium (Ti)** | 1.0 - 1.7 | | **Aluminum (Al)** | 0.35 - 0.75 | | **Manganese (Mn)** | ≤ 0.35 | | **Silicon (Si)** | ≤ 0.20 | | **Carbon (C)** | ≤ 0.03 | | **Sulfur (S)** | ≤ 0.010 | | **Copper (Cu)** | ≤ 0.20 | | **Phosphorus (P)** | ≤ 0.015 | *The optimized composition provides excellent corrosion resistance while enabling effective precipitation hardening through gamma double prime [γ'' Ni₃Nb] phase formation.* --- #### **Physical Properties** Critical properties for design and manufacturing engineering: | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 8.31 g/cm³ | 0.300 lb/in³ | | **Melting Range** | 1320 - 1360 °C | 2410 - 2480 °F | | **Specific Heat (20°C)** | 442 J/kg·K | 0.106 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 10.8 W/m·K | 75.0 Btu·in/hr·ft²·°F | | **Thermal Expansion Coefficient (20-100°C)** | 12.9 μm/m·°C | 7.2 μin/in·°F | | **Modulus of Elasticity** | 206 GPa | 29.9 x 10⁶ psi | | **Electrical Resistivity** | 1.28 μΩ·m | - | --- #### **Mechanical Properties** Enhanced mechanical properties achieved through optimized heat treatment: **Solution Annealed + Aged Condition:** * **Ultimate Tensile Strength:** 1100-1240 MPa (160-180 ksi) * **Yield Strength (0.2% Offset):** 760-895 MPa (110-130 ksi) * **Elongation:** 15-25% * **Reduction of Area:** 35-50% * **Hardness:** 30-40 HRC **Elevated Temperature Performance:** * **0.2% Yield Strength at 205°C (400°F):** ≥ 690 MPa (100 ksi) * **Stress Rupture Life at 650°C (1200°F):** ≥ 100 hours at 310 MPa (45 ksi) * **Creep Resistance:** Excellent up to 650°C (1200°F) --- #### **International Standards** Alloy 725 Rod conforms to several international specifications: **ASTM Standards:** * **ASTM B805:** Precipitation Hardening Nickel Alloy Bars, Forgings, and Forging Stock * **ASTM B649:** Nickel-Iron-Chromium-Molybdenum-Columbium Stabilized Alloy Rod and Bar **NACE Standards:** * **NACE MR0175/ISO 15156:** Suitable for use in H₂S-containing environments * **NACE MR0103:** Resistance to sulfide stress cracking **Other International Standards:** * **ISO 9724:** Nickel and Nickel Alloy Forgings * **DIN 17752:** Wrought Nickel and Nickel Alloys * **GB/T 15007:** Chinese Standard for Corrosion Resistant Alloys --- #### **Product Applications** Alloy 725 rod serves as fundamental material for critical components across industries: **Oil & Gas Industry:** * **Downhole Tools:** Drill collars, subs, mandrels, and hangers for sour service * **Wellhead Equipment:** Valve stems, Christmas tree components, wellhead seals * **Subsea Systems:** Connectors, pressure housings, specialized fasteners * **Surface Equipment:** Pump shafts, valve components, compressor rods **Chemical Processing:** * **Reactor Components:** Agitator shafts, mixer components, reactor internals * **Pump Components:** Shafts, impellers, bearing housings * **Valve Components:** Stems, trim parts, valve shafts * **Heat Exchangers:** Tube sheets, support rods, structural components **Marine & Offshore:** * **Marine Components:** Propeller shafts, rudder stocks, marine fasteners * **Offshore Structures:** Tensioner rods, mooring components, structural ties * **Desalination Plants:** Pump shafts, valve stems, heat exchanger components **Power Generation:** * **Nuclear Applications:** Control rod mechanisms, core internals, fastening systems * **FGD Systems:** Scrubber components, absorber tower internals * **Heat Exchangers:** Support rods, tube sheets, structural elements --- #### **Key Advantages** * **Exceptional Corrosion Resistance:** Superior performance in sour gas and chloride-containing environments * **High Strength:** Excellent mechanical properties maintained in corrosive conditions * **Outstanding Stress Corrosion Cracking Resistance:** Superior resistance to SCC in chloride environments * **Excellent Pitting Resistance:** High resistance to pitting and crevice corrosion * **Good Machinability:** Better machining characteristics compared to other corrosion-resistant superalloys * **Superior Fatigue Performance:** Excellent resistance to corrosion fatigue * **Weldability:** Good weldability with proper procedures and post-weld heat treatment * **Consistent Properties:** Uniform mechanical characteristics throughout rod diameter **Available Forms & Sizes:** * **Diameter Range:** 3mm to 300mm (0.125" to 12") * **Lengths:** Standard random lengths or cut-to-size * **Surface Finish:** Hot finished, turned, ground, or polished **Heat Treatment Specifications:** * **Solution Treatment:** 980-1010°C (1800-1850°F) followed by rapid cooling * **Aging Treatment:** 620-650°C (1150-1200°F) for 8-12 hours, air cool * **Double Aging:** Optional second aging at 590-620°C (1100-1150°F) for enhanced properties **Corrosion Performance:** * **Critical Pitting Temperature (ASTM G48):** > 85°C (185°F) * **Critical Crevice Temperature (ASTM G48):** > 65°C (150°F) * **Sulfide Stress Cracking:** Resistant per NACE MR0175 **Note:** *Inconel® is a registered trademark of Special Metals Corporation. Alloy 725 rod is typically supplied in the solution annealed condition for optimum machinability, with subsequent aging treatment to develop the optimal combination of strength and corrosion resistance. The alloy demonstrates good weldability but requires proper post-weld heat treatment to restore corrosion resistance in the heat-affected zone. Comprehensive material certification including chemical analysis, mechanical properties, and corrosion testing reports are provided for critical applications.*

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 1807 gallon liquid totes Special package is available on request.