INCOLOY Alloy 925,UNS N09925; NACE MR-01-75，1

### **Product Introduction: INCOLOY® Alloy 925** **INCOLOY® Alloy 925** is a precipitation-hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium, specifically designed to provide exceptional strength and corrosion resistance in severe service environments, particularly in sour gas and oil field applications. This age-hardenable alloy combines the advantages of high strength with excellent resistance to sulfide stress cracking, making it particularly suitable for demanding downhole applications in the oil and gas industry. The alloy is approved under NACE MR-01-75 for service in sour (H₂S-containing) environments, demonstrating its superior resistance to sulfide stress corrosion cracking. Its balanced composition allows for optimal performance in both corrosive media and high-stress applications. --- ### **Chemical Composition** The chemical composition is engineered for optimal strength and corrosion resistance: | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | 38.0 - 46.0 | | **Chromium (Cr)** | 19.5 - 23.5 | | **Iron (Fe)** | Balance | | **Molybdenum (Mo)** | 2.5 - 3.5 | | **Copper (Cu)** | 1.5 - 3.0 | | **Titanium (Ti)** | 1.9 - 2.4 | | **Aluminum (Al)** | 0.1 - 0.5 | | **Carbon (C)** | 0.03 max | | **Manganese (Mn)** | 0.5 max | | **Silicon (Si)** | 0.5 max | | **Sulfur (S)** | 0.03 max | --- ### **Physical Properties** INCOLOY Alloy 925 exhibits well-balanced physical properties: | Property | Value | |----------|-------| | **Density** | 8.08 g/cm³ | | **Melting Point** | 1350-1400 °C | | **Thermal Conductivity** | 11.2 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.10 μΩ·m | | **Modulus of Elasticity** | 200 GPa | | **Coefficient of Thermal Expansion** | 13.9 μm/m·°C (20-100°C) | | **Specific Heat Capacity** | 450 J/kg·K | | **Magnetic Permeability** | <1.01 | --- ### **Mechanical Properties** The alloy demonstrates excellent mechanical performance in various conditions: **Solution Annealed Condition:** - **Tensile Strength:** 690-860 MPa - **Yield Strength (0.2% Offset):** 310-520 MPa - **Elongation:** 30-45% - **Hardness:** 200-250 HB **Aged Condition:** - **Tensile Strength:** 1030-1240 MPa - **Yield Strength (0.2% Offset):** 760-930 MPa - **Elongation:** 15-25% - **Hardness:** 280-350 HB --- ### **Heat Treatment** **Standard Heat Treatment:** - **Solution Annealing:** 980-1010°C (1800-1850°F), rapid cool - **Aging Treatment:** 720-740°C (1325-1360°C) for 8 hours, air cool **Alternative Aging Treatments:** - Two-step aging available for specific property optimization - Stress relief treatments for welded components --- ### **Key Characteristics & Advantages** 1. **Exceptional Strength and Corrosion Resistance** - High strength maintained in corrosive environments - Excellent resistance to sulfide stress cracking - Good general corrosion resistance 2. **NACE MR-01-75 Compliance** - Approved for sour service applications - Suitable for H₂S-containing environments - Meets stringent oil and gas industry requirements 3. **Versatile Performance** - Good resistance to chloride-ion stress corrosion cracking - Excellent performance in acidic environments - Maintains properties at elevated temperatures 4. **Excellent Fabricability** - Good weldability using matching filler metals - Can be hot and cold worked - Suitable for conventional machining processes --- ### **Product Applications** **Oil and Gas Industry:** - Downhole tubing and casing - Wellhead components - Christmas tree equipment - Valve components and trim - Pump shafts and impellers **Chemical Processing:** - Reactors and pressure vessels - Heat exchangers in corrosive service - Piping systems for aggressive chemicals - Fasteners and bolting **Marine and Offshore:** - Subsea equipment - Seawater handling systems - Offshore platform components --- ### **International Standards** INCOLOY Alloy 925 is recognized under major international specifications: | Standard Type | Standard Number | Description | |---------------|-----------------|-------------| | **UNS** | N09925 | Unified Numbering System | | **NACE** | MR-01-75 | Sour Service Compliance | | **ASTM** | B805 | Bar and Billet | | **ASTM** | B804 | Plate, Sheet, and Strip | | **API** | 6A/17D | Oilfield Equipment Standards | | **DIN** | 2.4852 | Material Number | | **ASME** | SB-805 | Code Cases | --- ### **Summary** **INCOLOY Alloy 925 (UNS N09925)** is a premium precipitation-hardenable nickel-iron-chromium alloy that delivers an exceptional combination of high strength and superior corrosion resistance, particularly in sour service environments. Its compliance with **NACE MR-01-75** standards makes it particularly valuable for critical oil and gas applications where resistance to sulfide stress cracking is 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 3325 gallon liquid totes Special package is available on request.