INCONEL 725 Nickel Superalloy (UNS N07725),INCONEL alloy 725，1

### **Product Introduction: INCONEL® 725 (UNS N07725)** **INCONEL® Alloy 725** is a precipitation-hardenable nickel-chromium-molybdenum-niobium alloy designed to provide exceptional strength and outstanding corrosion resistance in severe environments, particularly in sour (H₂S-containing) oil and gas applications. This alloy combines the excellent general corrosion resistance of nickel-based alloys with high strength achieved through age-hardening heat treatment, making it particularly suitable for critical downhole components and other demanding applications in the energy industry. The alloy exhibits superior resistance to sulfide stress cracking, chloride-induced stress corrosion cracking, pitting, and crevice corrosion, while maintaining excellent mechanical properties at elevated temperatures and in high-chloride environments. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | 55.0 - 59.0 | | **Chromium (Cr)** | 19.0 - 22.5 | | **Molybdenum (Mo)** | 7.0 - 9.5 | | **Iron (Fe)** | Balance | | **Niobium (Nb)** | 2.75 - 4.00 | | **Titanium (Ti)** | 1.00 - 1.70 | | **Aluminum (Al)** | 0.35 max | | **Carbon (C)** | 0.03 max | | **Manganese (Mn)** | 0.35 max | | **Silicon (Si)** | 0.20 max | | **Sulfur (S)** | 0.01 max | | **Phosphorus (P)** | 0.015 max | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.31 g/cm³ | | **Melting Point** | 1325 - 1370 °C | | **Thermal Conductivity** | 10.5 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.30 μΩ·m | | **Modulus of Elasticity** | 206 GPa | | **Coefficient of Thermal Expansion** | 12.8 μm/m·°C (20-100°C) | | **Specific Heat Capacity** | 440 J/kg·K | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties** **Solution Annealed Condition:** - **Tensile Strength:** 827 - 1034 MPa - **Yield Strength (0.2% Offset):** 414 - 621 MPa - **Elongation:** 35 - 50% - **Hardness:** 25 - 35 HRC **Aged Condition:** - **Tensile Strength:** 1241 - 1379 MPa - **Yield Strength (0.2% Offset):** 1034 - 1172 MPa - **Elongation:** 15 - 25% - **Hardness:** 35 - 42 HRC --- ### **Heat Treatment** **Standard Heat Treatment:** - **Solution Treatment:** 1038 - 1066 °C (1900 - 1950 °F), rapid cool - **Aging Treatment:** 732 °C (1350 °F) for 8 hours, furnace cool to 621 °C (1150 °F), hold for 8 hours, air cool **Alternative Treatments:** - Single-step aging treatments available - Stress relief treatments for welded components --- ### **Key Characteristics & Advantages** 1. **Exceptional Corrosion Resistance** - Outstanding resistance to sulfide stress cracking (SSC) - Excellent resistance to chloride-induced stress corrosion cracking - Superior pitting and crevice corrosion resistance 2. **High Strength Capability** - Excellent strength-to-weight ratio - Good mechanical properties at elevated temperatures - Superior fatigue and wear resistance 3. **NACE MR0175/ISO 15156 Compliance** - Approved for sour service applications - Suitable for H₂S-containing environments - Meets stringent oil and gas industry requirements 4. **Excellent Fabricability** - Good weldability using matching filler metals - Suitable for hot and cold working - Can be machined using conventional methods --- ### **Product Applications** **Oil and Gas Industry:** - Downhole tubing and casing - Wellhead components - Christmas tree equipment - Valve trim and components - Pump shafts and impellers **Marine and Offshore:** - Subsea equipment - Fasteners and bolting - Marine riser systems - Offshore platform components **Chemical Processing:** - Reactors and pressure vessels - Heat exchangers in corrosive service - Piping systems for aggressive chemicals - Pump components and valves --- ### **International Standards** | Standard Type | Standard Number | Product Form | |---------------|-----------------|--------------| | **UNS** | N07725 | Unified Numbering System | | **ASTM** | B805 | Bar and Billet | | **ASTM** | B804 | Plate, Sheet, and Strip | | **NACE** | MR0175/ISO 15156 | Sour Service Compliance | | **API** | 6A/17D | Oilfield Equipment Standards | | **ASME** | SB-805 | Code Cases | | **DIN** | 2.4858 | Material Number | --- ### **Summary** **INCONEL® Alloy 725 (UNS N07725)** is a premium precipitation-hardenable nickel-chromium-molybdenum-niobium superalloy that delivers an exceptional combination of high strength and superior corrosion resistance, particularly in sour service environments. Its compliance with **NACE MR0175/ISO 15156** standards makes it particularly valuable for critical oil and gas applications where resistance to sulfide stress cracking and chloride-induced corrosion are paramount. The alloy's versatile performance in both corrosive media and high-stress conditions, combined with excellent fabricability, establishes it as a preferred material for downhole components, wellhead equipment, and other critical applications in the energy industry. Comprehensive certification to international standards including ASTM, API, and NACE specifications ensures consistent quality and reliability, providing engineers with a proven solution for the most demanding service conditions where both mechanical integrity and corrosion resistance are essential requirements.

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 3336 gallon liquid totes Special package is available on request.