Alloy 725，Inconel 725 Wire，UNS N07725，EFORU

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

### **Product Introduction: Alloy 725 / Inconel 725 Wire (UNS N07725)** #### **Overview** **Alloy 725 Wire** (commercially known as **Inconel® 725 Wire**) is a high-performance nickel-chromium-molybdenum-niobium alloy supplied in wire form, combining exceptional corrosion resistance with high strength in severe environments. This precipitation-hardenable alloy wire maintains outstanding performance in corrosive media including sour gas (H₂S-containing) wells, acidic solutions, and chloride-containing environments, while providing excellent mechanical properties at temperatures up to 650°C (1200°F). The wire is manufactured through sophisticated drawing processes and controlled heat treatments to ensure consistent diameter, superior surface quality, and reliable performance in critical oil and gas, chemical processing, and marine applications. The unique age-hardening characteristics of Alloy 725 wire, achieved through gamma prime [γ'] and gamma double prime [γ''] phase formation, provide exceptional strength and corrosion resistance even after prolonged exposure to aggressive service conditions. --- #### **Chemical Composition** The chemical composition of Alloy 725 Wire (UNS N07725) conforms to strict international standards: | 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 enables effective precipitation hardening through gamma double prime [γ'' Ni₃Nb] phase formation during thermal processing.* --- #### **Physical Properties** Critical properties for wire applications and component design: | 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** Properties vary based on wire diameter and heat treatment condition: **Annealed Condition (Typical):** * **Tensile Strength:** 900-1050 MPa (130-152 ksi) * **Yield Strength (0.2% Offset):** 550-700 MPa (80-102 ksi) * **Elongation:** 25-35% * **Reduction of Area:** 35-50% **Precipitation Hardened Condition:** * **Tensile Strength:** 1100-1240 MPa (160-180 ksi) * **Yield Strength (0.2% Offset):** 760-895 MPa (110-130 ksi) * **Elongation:** 15-25% * **Hardness:** 30-40 HRC --- #### **International Standards** Alloy 725 Wire complies with major international specifications: **Welding Wire Standards:** * **AWS A5.14:** Specification for Nickel and Nickel-Alloy Bare Welding Electrodes and Rods * **ASTM B637:** Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock **NACE Standards:** * **NACE MR0175/ISO 15156:** Suitable for use in H₂S-containing environments * **NACE MR0103:** Resistance to sulfide stress cracking **Quality Assurance Standards:** * **ISO 9001:** Quality Management Systems * **ASME SFA-5.14:** Specification for Nickel and Nickel-Alloy Bare Welding Electrodes and Rods --- #### **Product Applications** **Welding Consumable Applications:** * **Gas Tungsten Arc Welding (GTAW/TIG):** Bare wire for joining Alloy 725 components in corrosive service * **Gas Metal Arc Welding (GMAW/MIG):** Wire for automated welding processes * **Repair and Maintenance:** Welding repair of corrosion-resistant equipment * **Cladding Applications:** Overlay welding for corrosion protection **Component Manufacturing Applications:** * **Fasteners:** High-strength bolts, studs, screws for sour service applications * **Springs:** Corrosion-resistant springs for valves, actuators, and safety systems * **Wire Mesh:** High-corrosion resistance filters, screens, and woven products * **Electrical Components:** Heating elements, resistance wires for corrosive environments **Specialized Applications:** * **Thermal Spray:** Wire arc spraying for corrosion-resistant coatings * **Cold Heading:** Wire for producing complex shaped corrosion-resistant components * **Medical Devices:** Surgical instruments and specialized medical components * **Marine Components:** Corrosion-resistant marine fasteners and springs --- #### **Key Advantages** * **Excellent Weldability:** Produces sound, crack-resistant welds with matching composition * **Exceptional Corrosion Resistance:** Superior performance in sour gas and chloride-containing environments * **High Strength:** Excellent mechanical properties maintained in corrosive conditions * **Good Fabricability:** Can be drawn, formed, and machined using standard techniques * **Consistent Quality:** Uniform diameter and surface finish throughout wire length * **Outstanding Stress Corrosion Cracking Resistance:** Superior resistance to SCC in chloride environments * **Excellent Pitting Resistance:** High resistance to pitting and crevice corrosion * **Versatile Applications:** Suitable for both welding and component manufacturing **Available Forms & Sizes:** * **Spooled Wire:** 0.5mm to 2.5mm diameter on various spool sizes * **Straight Lengths:** 1.0mm to 6.0mm diameter in cut lengths * **Special Packaging:** Custom spooling and packaging to meet specific requirements **Surface Conditions:** * **Bright Finish:** Clean, scale-free surface for welding applications * **Annealed Scale:** Heat-treated condition with surface oxide * **Chemically Cleaned:** Precision cleaned for critical applications **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 **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 wire is typically supplied in the annealed condition for optimum formability and weldability, with subsequent aging treatment to develop the optimal combination of strength and corrosion resistance. Proper storage conditions and handling procedures are essential to prevent surface contamination and maintain wire quality. Comprehensive certification including chemical analysis, mechanical properties, corrosion testing reports, and NACE MR0175 compliance are provided with each shipment.*

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 1818 gallon liquid totes Special package is available on request.