Alloy 925,Incoloy 925 Pipe,UNS N09925,E FORU

British Specs:，American Specs:，German Specs:

### **Product Datasheet: Alloy 925 / Incoloy 925 Pipe (UNS N09925)** **Alloy 925** (commercially known as **Incoloy 925**) pipe is a precipitation-hardenable nickel-iron-chromium alloy manufactured in tubular form for demanding applications requiring exceptional corrosion resistance, high strength, and superior performance in aggressive environments. This product form is specifically engineered for critical service in oil and gas production, chemical processing, and marine applications where reliability under high pressure and corrosive conditions is paramount. --- #### **1. Chemical Composition** The chemical composition of Alloy 925 pipe is carefully balanced to provide optimal performance in corrosive environments: | Element | Content (%) | |:---|:---| | **Nickel (Ni)** | 42.0 - 46.0 | | **Chromium (Cr)** | 19.5 - 23.5 | | **Iron (Fe)** | 22.0 min | | **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)** | 0.50 max | | **Silicon (Si)** | 0.50 max | | **Sulfur (S)** | 0.03 max | | **Phosphorus (P)** | 0.03 max | *Note: The combination of nickel and chromium provides fundamental corrosion resistance, while titanium and aluminum enable age-hardening. Molybdenum and copper enhance resistance to chloride-induced stress corrosion cracking and sour gas environments.* --- #### **2. Physical Properties** Alloy 925 pipe exhibits consistent physical properties across all sizes and schedules: | Property | Value | |:---|:---| | **Density** | 8.08 g/cm³ (0.292 lb/in³) | | **Melting Range** | 1370 - 1400°C (2500 - 2550°F) | | **Coefficient of Thermal Expansion** | 14.2 × 10⁻⁶/°C (20-100°C) | | **Thermal Conductivity** | 11.5 W/m·K (at 100°C) | | **Specific Heat** | 448 J/kg·K (at 100°C) | | **Modulus of Elasticity** | 196 GPa (28.4 × 10⁶ psi) | | **Magnetic Permeability** | <1.005 (essentially non-magnetic) | --- #### **3. Mechanical Properties** **Standard Mechanical Properties (Aged Condition):** | Property | Seamless Pipe | Welded Pipe | |:---|:---|:---| | **Tensile Strength** | 965 MPa (140 ksi) min | 930 MPa (135 ksi) min | | **Yield Strength (0.2% Offset)** | 760 MPa (110 ksi) min | 690 MPa (100 ksi) min | | **Elongation** | 15% min | 15% min | | **Hardness** | 241 - 302 HB | 225 - 285 HB | **Pressure Ratings (Example - Schedule 80):** - **Working Pressure:** Up to 25,000 psi at 38°C (100°F) - **Burst Pressure:** Approximately 4 × working pressure - **Temperature Derating:** Maintains strength up to 650°C (1200°F) --- #### **4. Product Specifications** **Available Forms:** - **Seamless Pipe:** Sizes 1/8" to 24" NPS - **Welded Pipe:** Sizes 1/8" to 48" NPS - **Schedules:** 5S, 10S, 40S, 80S, 160, XXS - **Lengths:** Random (16-24'), Double Random (34-40'), Cut to Length **Standard Specifications:** - **OD Tolerances:** ±1% or ±0.5mm, whichever is greater - **Wall Thickness Tolerances:** ±12.5% for seamless, ±10% for welded - **Straightness:** Maximum 1.5mm per meter - **Surface Finish:** Pickled, polished, or as-drawn --- #### **5. Product Applications** **Oil & Gas Industry:** - **Production Tubing:** For sour gas wells with H₂S and CO₂ - **Flow Lines & Gathering Lines:** Corrosive fluid transport - **Christmas Tree Components:** Valves, fittings, and connectors - **Downhole Tools:** Housing and pressure-containing parts - **Subsea Pipelines:** Deepwater production systems **Chemical Processing:** - **Reactor Coils & Jackets:** For aggressive chemical processes - **Heat Exchanger Tubes:** In corrosive service environments - **Process Piping:** Handling acids, chlorides, and other corrosives - **Distillation Columns:** Transfer lines and internals **Power Generation:** - **Boiler Tubes:** In waste heat recovery systems - **Flue Gas Desulfurization:** Ducting and spray piping - **Geothermal Systems:** High-temperature brine handling **Marine & Offshore:** - **Seawater Piping:** Cooling water and fire water systems - **Hydraulic Lines:** Subsea control systems - **Ballast & Bilge Systems:** Corrosion-resistant piping --- #### **6. International Standards** **Material & Manufacturing Standards:** - **UNS N09925**: Unified Numbering System designation - **ASTM B423**: Standard for Seamless Pipe and Tube - **ASTM B705**: Standard for Welded Pipe - **ASME SB423**: ASME Boiler and Pressure Vessel Code - **API 5LC**: CRA Line Pipe Specification **Dimensional Standards:** - **ASME B36.10/19**: Welded and Seamless Wrought Steel Pipe - **ISO 11960**: Petroleum and natural gas industries - Steel pipes - **NORSOK M-630**: Material data sheets for piping **Quality & Testing Standards:** - **ASTM A530**: General Requirements for Specialized Carbon and Alloy Steel Pipe - **ASTM E213**: Ultrasonic Testing of Metal Pipe and Tubing - **ASTM E309**: Eddy Current Examination of Steel Tubular Products - **Hydrostatic Testing:** Per applicable code requirements --- #### **7. Corrosion Resistance** **Excellent Resistance To:** - **Sulfide Stress Cracking (SSC):** NACE MR0175/ISO 15156 compliant - **Chloride Stress Corrosion Cracking (ClSCC):** Superior to stainless steels - **Pitting & Crevice Corrosion:** Critical pitting temperature >85°C - **General Corrosion:** In acids, alkalis, and salt solutions - **Erosion-Corrosion:** Maintains integrity in high-velocity flows **Typical Corrosion Performance:** - **NACE TM0177 Method A:** Excellent resistance in Solution A - **5% NaCl + 0.5% Acetic Acid + H₂S:** <0.025 mm/year corrosion rate - **Acidified FeCl₃ Solution:** Resists pitting up to 50°C --- #### **8. Fabrication & Installation** **Welding Procedures:** - **Processes:** GTAW (preferred), GMAW, SMAW - **Filler Metal:** ERNiFeCr-1 (INCO-WELD 925) - **Preheat:** Not normally required - **Interpass Temperature:** <150°C - **Post-Weld Heat Treatment:** Recommended for aged material **Bending & Forming:** - **Cold Bending:** Minimum bend radius 3 × OD for thin wall - **Hot Bending:** Recommended for tight radii or heavy wall - **Annealing Condition:** Optimal for severe forming operations **Installation Considerations:** - **Threading:** API and NPT threads available - **Flanging:** Compatible with standard flange designs - **Support Spacing:** Standard carbon steel spacing applicable --- #### **9. Technical Advantages** * **Superior Corrosion Resistance:** Excellent performance in sour service and chloride environments * **High Pressure Capability:** Maintains integrity under extreme pressure conditions * **Temperature Resistance:** Suitable for service from cryogenic to 650°C * **Age-Hardenable:** Can be heat treated for optimal strength properties * **Industry Acceptance:** Compliant with major oil & gas and chemical industry standards * **Long Service Life:** Reduced maintenance and replacement costs * **Versatile Manufacturing:** Available in both seamless and welded constructions --- #### **10. Quality Assurance** **Certification & Testing:** - **Mill Test Certificates:** EN 10204 3.1/3.2 - **Chemical Analysis:** Full traceability to heat number - **Mechanical Tests:** Tensile, hardness, flattening, flaring - **Non-Destructive Examination:** UT, RT, ET, PT as specified - **Hydrostatic Testing:** Standard or to customer requirements - **NACE Compliance:** Certification for sour service applications Alloy 925 pipe provides a reliable, high-performance solution for the most demanding corrosive service applications, offering exceptional resistance to sour gas environments, chloride stress corrosion cracking, and general corrosion while maintaining high mechanical strength and pressure containment capabilities.

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 2004 gallon liquid totes Special package is available on request.