Alloy 725，Inconel 725 Plate，UNS N07725，EFORU

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

### **Product Introduction: Alloy 725 / Inconel 725 Plate (UNS N07725)** #### **Overview** **Alloy 725 Plate** (commercially known as **Inconel® 725 Plate**) is a premium precipitation-hardenable nickel-chromium-molybdenum-niobium alloy supplied in plate form, offering exceptional corrosion resistance combined with high strength in severe environments. This advanced superalloy plate maintains outstanding performance in corrosive media including sour gas (H₂S-containing) wells, acidic environments, and chloride-containing solutions, while providing excellent mechanical properties at temperatures up to 650°C (1200°F). The plate product undergoes controlled thermo-mechanical processing and precise heat treatments to ensure uniform grain structure, consistent properties throughout the thickness, 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 structural applications. --- #### **Chemical Composition** The chemical composition of Alloy 725 Plate (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 structural design and fabrication 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% * **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 Plate conforms to several international specifications: **ASTM Standards:** * **ASTM B670:** Plate, Sheet, and Strip for High-Temperature Service * **ASTM B906:** General Requirements for Flat-Rolled Nickel and Nickel Alloys **NACE Standards:** * **NACE MR0175/ISO 15156:** Suitable for use in H₂S-containing environments * **NACE MR0103:** Resistance to sulfide stress cracking **Other International Standards:** * **ISO 6208:** Nickel and nickel alloy plates * **DIN 17750:** Nickel and nickel alloy plates - Technical delivery conditions * **GB/T 2054:** Chinese standard for nickel and nickel alloy plates --- #### **Product Applications** Alloy 725 plates serve as fundamental material for critical components across multiple industries: **Oil & Gas Industry:** * **Pressure Vessels:** Reactor vessels, separator components, pressure containers for sour service * **Wellhead Equipment:** Flanges, valve bodies, Christmas tree components * **Subsea Structures:** Manifold bases, template components, support frames * **Process Equipment:** Heat exchanger plates, reactor internals **Chemical Processing:** * **Reactor Vessels:** High-pressure reactors for corrosive chemical processes * **Distillation Columns:** Tower internals, support plates, bubble caps * **Heat Exchangers:** Header plates, support plates, baffle components * **Storage Tanks:** Liner plates for corrosive chemical storage **Marine & Offshore:** * **Marine Structures:** Hull components for corrosive service, deck plates * **Offshore Platforms:** Process equipment supports, structural members * **Desalination Plants:** Evaporator sections, pressure vessel components **Power Generation:** * **FGD Systems:** Scrubber vessels, absorber tower components * **Nuclear Applications:** Core support structures, shielding components * **Heat Exchangers:** Tube sheets, support plates for corrosive service --- #### **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 * **Excellent Weldability:** Can be welded using conventional methods with proper technique * **Outstanding Fatigue Resistance:** Superior performance under cyclic loading conditions * **Good Fabricability:** Can be machined, formed, and welded using standard industrial equipment * **Uniform Properties:** Consistent mechanical properties throughout the plate thickness **Available Forms & Sizes:** * **Thickness Range:** 3mm to 150mm (0.125" to 6") * **Width Range:** Up to 2000mm (78") * **Length Range:** Up to 6000mm (236") * **Surface Finish:** Hot rolled, annealed, pickled, or machined **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 * **Stress Relieving:** Available for formed and welded components **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 plate 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 **Note:** *Inconel® is a registered trademark of Special Metals Corporation. Alloy 725 plate is typically supplied in the solution annealed condition for optimum formability, with subsequent aging treatment to develop the optimal combination of strength and corrosion resistance. The material 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 1811 gallon liquid totes Special package is available on request.