Alloy 725，Inconel 725 Sheet，UNS N07725，EFORU

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

### **Product Introduction: Alloy 725 / Inconel 725 Sheet (UNS N07725)** #### **Overview** **Alloy 725 Sheet** (commercially known as **Inconel® 725 Sheet**) is a high-performance nickel-chromium-molybdenum-niobium alloy supplied in thin, flat-rolled form, offering an exceptional combination of corrosion resistance and high strength in severe environments. This precipitation-hardenable material 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 sheet product undergoes precision rolling and controlled heat treatment processes to ensure consistent gauge control, superior surface quality, 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 fabricated components. --- #### **Chemical Composition** The chemical composition of Alloy 725 Sheet (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 sheet metal design and fabrication: | 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 Condition (Formable):** * **Tensile Strength:** 900-1050 MPa (130-152 ksi) * **Yield Strength:** 550-700 MPa (80-102 ksi) * **Elongation:** 20-30% **Precipitation Hardened Condition:** * **Tensile Strength:** 1100-1240 MPa (160-180 ksi) * **Yield Strength:** 760-895 MPa (110-130 ksi) * **Elongation:** 15-25% * **Hardness:** 30-40 HRC --- #### **International Standards** Alloy 725 Sheet 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 sheets * **DIN 17750:** Nickel and nickel alloy sheets - Technical delivery conditions * **GB/T 2054:** Chinese standard for nickel and nickel alloy sheets --- #### **Product Applications** Alloy 725 sheets serve critical functions across multiple high-performance industries: **Oil & Gas Industry:** * **Pressure Vessels:** Liner sheets, head components, separator internals for sour service * **Heat Exchangers:** Plate-type heat exchanger components * **Process Equipment:** Reactor linings, distillation column internals * **Subsea Components:** Pressure housings, protective covers **Chemical Processing:** * **Reaction Vessels:** Liner sheets for corrosive chemical reactors * **Storage Tanks:** Cladding for chemical storage tanks * **Ducting Systems:** Corrosive fume handling ducts * **Process Equipment:** Mixer blades, agitator components **Marine & Offshore:** * **Marine Structures:** Hull lining sheets, deck plating for corrosive service * **Offshore Platforms:** Process equipment covers, structural panels * **Desalination Plants:** Evaporator panels, brine handling components **Power Generation:** * **FGD Systems:** Scrubber lining sheets, ductwork components * **Heat Exchangers:** Heat recovery system panels * **Nuclear Applications:** Containment liners, shielding components --- #### **Key Advantages** * **Excellent Formability:** Can be deep drawn, stretch formed, and spun in annealed condition * **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 Weldability:** Can be welded using conventional methods (TIG, MIG, resistance) * **Excellent Fatigue Performance:** Superior resistance to vibration and thermal cycling * **Surface Quality:** Available with various surface finishes (2B, polished, pickled) **Available Forms & Sizes:** * **Thickness Range:** 0.5mm to 6.0mm (0.020" to 0.236") * **Width Range:** Up to 1500mm (60") * **Length Range:** Up to 3000mm (118") * **Surface Finishes:** 2B, BA, polished, pickled, or custom finishes **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 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:** * **Dimensional Verification:** Thickness, width, and flatness inspection * **Surface Quality:** Visual and instrumental surface examination * **Mechanical Testing:** Tensile, hardness, and bend testing * **Corrosion Testing:** Pitting, crevice, and stress corrosion cracking tests **Note:** *Inconel® is a registered trademark of Special Metals Corporation. Alloy 725 sheet 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. Proper handling and storage in controlled environments are essential to prevent surface damage and contamination. Comprehensive material certification is provided for all 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 1812 gallon liquid totes Special package is available on request.