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

British Specs:，American Specs:，German Specs:

### **Product Datasheet: Alloy 925 / Incoloy 925 Tube (UNS N09925)** **Alloy 925** (commercially known as **Incoloy 925**) tube is a precipitation-hardenable nickel-iron-chromium alloy manufactured in tubular form for applications requiring exceptional corrosion resistance, high strength, and superior performance in aggressive environments. This product form is specifically designed for heat exchangers, condensers, and other precision applications where reliability under high pressure, temperature, and corrosive conditions is critical. --- #### **1. Chemical Composition** The chemical composition of Alloy 925 tube is precisely controlled to ensure optimal performance: | 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 balanced composition provides excellent age-hardening capability through gamma prime precipitation (Ti, Al) while maintaining superior corrosion resistance in sour gas and chloride environments (Cr, Mo, Cu).* --- #### **2. Physical Properties** Alloy 925 tube exhibits consistent physical properties: | 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) | | **Electrical Resistivity** | 1.12 μΩ·m | | **Magnetic Permeability** | <1.005 (essentially non-magnetic) | --- #### **3. Mechanical Properties** **Standard Mechanical Properties (Aged Condition):** | Property | Seamless Tube | Welded Tube | |:---|:---|:---| | **Tensile Strength** | 930 MPa (135 ksi) min | 895 MPa (130 ksi) min | | **Yield Strength (0.2% Offset)** | 690 MPa (100 ksi) min | 655 MPa (95 ksi) min | | **Elongation** | 20% min | 18% min | | **Hardness** | 225 - 285 HB | 210 - 269 HB | **Pressure Performance:** - **Maximum Working Pressure:** Varies with tube size and wall thickness - **Burst Pressure:** Typically 3-4 × working pressure - **Collapse Resistance:** Excellent under external pressure - **Temperature Range:** -29°C to 650°C (-20°F to 1200°F) --- #### **4. Product Specifications** **Available Forms:** - **Seamless Tube:** OD 1/8" to 6" (3.2mm to 152.4mm) - **Welded Tube:** OD 1/8" to 4" (3.2mm to 101.6mm) - **Wall Thickness:** 0.5mm to 12mm (0.020" to 0.472") - **Lengths:** Standard up to 20 feet, custom lengths available **Tube Types & Sizes:** - **Heat Exchanger Tubes:** To ASTM/ASME specifications - **Condenser Tubes:** Various wall thicknesses and diameters - **Instrumentation Tubing:** Small diameters with precise tolerances - **Mechanical Tubing:** For structural and mechanical applications --- #### **5. Product Applications** **Heat Exchanger Applications:** - **Shell and Tube Heat Exchangers:** For corrosive service - **Condenser Tubes:** In chemical processing and power generation - **Feedwater Heaters:** For high-pressure steam systems - **Cooler Tubes:** Handling aggressive cooling media **Oil & Gas Industry:** - **Heat Exchanger Bundles:** In refinery and petrochemical service - **Surface Condensers:** For geothermal and oil production - **Process Coolers:** In gas processing plants - **Compressor Intercoolers:** For sour gas service **Chemical Processing:** - **Reactor Coils:** For temperature control in corrosive media - **Evaporator Tubes:** In concentration and crystallization processes - **Waste Heat Boilers:** Recovering energy from corrosive streams - **Quench Systems:** High-temperature cooling applications **Power Generation:** - **Surface Condensers:** For fossil and nuclear power plants - **Feedwater Heaters:** High-pressure preheating stages - **Closed Cooling Water Systems:** For critical equipment cooling --- #### **6. International Standards** **Material & Manufacturing Standards:** - **UNS N09925**: Unified Numbering System designation - **ASTM B423**: Standard for Seamless Pipe and Tube - **ASTM B163**: Standard for Seamless Condenser and Heat-Exchanger Tubes - **ASTM B704/B705**: Standard for Welded Tubes - **ASME SB423/SB163**: ASME Boiler and Pressure Vessel Code **Dimensional Standards:** - **ASTM B751**: General Requirements for Tubes - **ASME B36.19**: Stainless Steel and Nickel Alloy Tube - **TEMA Standards**: Tubular Exchanger Manufacturers Association **Testing & Inspection:** - **ASTM E213**: Ultrasonic Testing - **ASTM E309**: Eddy Current Testing - **ASTM E426**: Electromagnetic (Eddy Current) Testing - **Hydrostatic Testing**: Per applicable code requirements - **Pneumatic Testing**: For special applications --- #### **7. Corrosion Resistance** **Excellent Performance In:** - **Sour Gas Environments:** H₂S and CO₂ containing systems - **Chloride Solutions:** Resistant to stress corrosion cracking - **Acidic Conditions:** Sulfuric, phosphoric, and organic acids - **Alkaline Solutions:** Good resistance to caustic environments - **Seawater:** Excellent pitting and crevice corrosion resistance **Corrosion Performance Data:** - **Critical Pitting Temperature (ASTM G48):** >85°C - **Critical Crevice Temperature:** >65°C - **NACE TM0177:** Compliant for sour service - **General Corrosion Rate:** <0.1 mm/year in most chemical environments --- #### **8. Fabrication & Installation** **Tube Expansion:** - **Maximum Expansion:** 8% of tube wall thickness per pass - **Lubrication:** Recommended for heavy wall tubes - **Sequencing:** Proper expansion pattern to minimize stress **Tube Bending:** - **Minimum Bend Radius:** 2 × OD for thin wall tubes - **Bending Methods:** Mandrel, compression, or roll bending - **Annealing Condition:** Preferred for tight radius bends **Welding & Joining:** - **Tube-to-Tubesheet Welding:** GTAW process recommended - **Filler Metal:** ERNiFeCr-1 or equivalent - **Welding Positions:** All positions achievable - **Quality Requirements:** Typically 100% radiographic examination --- #### **9. Technical Advantages** * **Superior Heat Transfer:** Excellent thermal conductivity for efficient heat exchange * **Corrosion Resistance:** Outstanding performance in aggressive environments * **Mechanical Strength:** High strength-to-weight ratio * **Age-Hardenable:** Can be heat treated for optimal properties * **Fabrication Versatility:** Suitable for various manufacturing processes * **Long Service Life:** Reduced maintenance and replacement frequency * **Industry Compliance:** Meets major international standards --- #### **10. Quality Assurance** **Certification & Documentation:** - **Mill Test Certificates:** EN 10204 3.1/3.2 - **Chemical Analysis:** Full traceability with heat number - **Mechanical Testing:** Tensile, hardness, flattening, flaring - **Non-Destructive Testing:** UT, ET, RT, PT as specified - **Surface Inspection:** Visual and dimensional checks - **Special Testing:** Corrosion tests, micrographic examination **Quality Control Processes:** - **Raw Material Control:** Verified chemical composition - **Process Control:** Monitored manufacturing parameters - **Final Inspection:** Comprehensive quality verification - **Traceability:** Complete documentation from melt to final product Alloy 925 tube offers exceptional performance for critical heat transfer applications in corrosive environments, providing reliable service in oil & gas, chemical processing, power generation, and marine industries where both corrosion resistance and mechanical integrity 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 2005 gallon liquid totes Special package is available on request.