Alloy 725，Inconel 725 Forgings，UNS N07725，EFORU

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

### **Product Introduction: Alloy 725 / Inconel 725 Forgings (UNS N07725)** #### **Overview** **Alloy 725 Forgings** (commercially known as **Inconel® 725 Forgings**) represent the highest quality form of this advanced nickel-chromium-molybdenum-niobium superalloy, specifically engineered for the most demanding applications in severe corrosive environments. The forging process significantly enhances the alloy's grain structure, mechanical properties, and metallurgical integrity throughout the component. Inconel 725 forgings deliver exceptional corrosion resistance combined with high strength, outstanding fatigue resistance, and superior performance in sour gas (H₂S-containing) environments at temperatures up to 650°C (1200°F), making them indispensable for critical components in oil and gas, chemical processing, and marine industries. The combination of specialized forging techniques and the alloy's unique precipitation-hardening capability through gamma prime [γ'] and gamma double prime [γ''] phase formation results in components with optimized grain flow, improved ductility, and enhanced resistance to stress corrosion cracking, ensuring reliable performance in safety-critical applications. --- #### **Chemical Composition** The chemical composition of Alloy 725 Forgings (UNS N07725) meets rigorous 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 superior precipitation hardening response through gamma double prime [γ'' Ni₃Nb] phase formation during controlled heat treatment cycles.* --- #### **Physical Properties** Critical properties for forged component design and performance: | 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 controlled forging and 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 Forgings comply with stringent international specifications: **ASTM Standards:** * **ASTM B564:** Standard Specification for Nickel Alloy Forgings * **ASTM B805:** 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 & Testing Standards:** * **AMS 2269:** Chemical Check Analysis Limits * **ASTM E112:** Grain Size Determination * **ASTM A388:** Ultrasonic Examination of Heavy Steel Forgings --- #### **Product Applications** Alloy 725 forgings serve in the most critical applications across industries: **Oil & Gas Industry:** * **Wellhead Equipment:** Valve bodies, Christmas tree components, wellhead hubs * **Downhole Tools:** Drill collars, subs, hangers, and mandrels for sour service * **Subsea Systems:** Connectors, manifold blocks, pressure housings * **Surface Equipment:** High-pressure valve components, pump casings **Chemical Processing:** * **Reactor Vessels:** High-pressure reactors for corrosive chemical processes * **Pump Components:** Impellers, shafts, casing parts for corrosive service * **Valve Components:** Valve bodies, stems, trim parts * **Mixer Components:** Agitator shafts, bearing housings **Marine & Offshore:** * **Marine Components:** Propeller shafts, submarine components, marine valves * **Offshore Structures:** Tensioner systems, mooring components * **Desalination Plants:** High-pressure pump components, valve bodies **Power Generation:** * **Nuclear Components:** Reactor core internals, control rod mechanisms * **FGD Systems:** Scrubber components, absorber tower internals * **Heat Exchangers:** Tube sheets, header components --- #### **Key Advantages** * **Superior Grain Structure:** Refined, uniform grain size with optimized grain flow * **Enhanced Mechanical Properties:** Improved strength, ductility, and toughness compared to cast products * **Exceptional Corrosion Resistance:** Superior performance in sour gas and chloride-containing environments * **Excellent Fatigue Resistance:** Superior performance under cyclic loading conditions * **Improved Reliability:** Reduced incidence of internal defects and improved structural integrity * **Outstanding Stress Corrosion Cracking Resistance:** Superior resistance to SCC in chloride environments * **Better Microstructural Control:** Controlled precipitation and phase distribution * **Optimized Grain Flow:** Grain structure aligned with component stress patterns **Forging Capabilities:** * **Open Die Forgings:** Large, complex shapes and custom configurations * **Closed Die Forgings:** Precision forgings with minimal machining requirements * **Ring Rolled Forgings:** Large diameter rings for rotational components * **Press Forgings:** High-tonnage press forgings for critical components **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 **Quality Assurance:** * **Ultrasonic Testing:** Full component scanning for internal defects * **Chemical Analysis:** Complete composition verification * **Mechanical Testing:** Tensile, impact, and hardness testing * **Corrosion Testing:** Pitting, crevice, and stress corrosion cracking tests * **Microstructural Examination:** Grain size and phase distribution analysis **Note:** *Inconel® is a registered trademark of Special Metals Corporation. Alloy 725 forgings are typically supplied in the solution treated and aged condition (STA) with comprehensive certification including chemical analysis, mechanical properties, microstructural examination, and corrosion testing reports. Special quality requirements such as enhanced ultrasonic testing, grain size control, and specific heat treatment protocols are available to meet unique application demands. Proper machining and handling procedures are essential to maintain the integrity of these high-performance components.*

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 1815 gallon liquid totes Special package is available on request.