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

British Specs:，American Specs:，German Specs:

### **Product Datasheet: Alloy 925 / Incoloy 925 Plate (UNS N09925)** **Alloy 925** (commercially known as **Incoloy 925**) plate is a precipitation-hardenable nickel-iron-chromium alloy supplied in plate form, offering exceptional corrosion resistance combined with high strength in aggressive environments. This product form is specifically designed for pressure vessels, chemical processing equipment, and structural applications where reliability under severe corrosive conditions and mechanical stress is paramount. --- #### **1. Chemical Composition** The chemical composition of Alloy 925 plate is carefully balanced 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 strategic combination of nickel and chromium provides fundamental corrosion resistance, while titanium and aluminum enable age-hardening through gamma prime precipitation. Molybdenum and copper enhance resistance to chloride-induced stress corrosion cracking and sour gas environments.* --- #### **2. Physical Properties** Alloy 925 plate 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) | | **Magnetic Permeability** | <1.005 (essentially non-magnetic) | --- #### **3. Mechanical Properties** **Standard Mechanical Properties (Aged Condition per ASTM B424):** | Property | Value | |:---|:---| | **Tensile Strength** | 965 MPa (140 ksi) min | | **Yield Strength (0.2% Offset)** | 760 MPa (110 ksi) min | | **Elongation** | 15% min | | **Reduction of Area** | 30% min | | **Hardness** | 241 - 302 HB | **Elevated Temperature Properties:** - **Service Temperature:** Up to 650°C (1200°F) - **Creep Strength:** Excellent resistance to deformation under stress - **Stress Rupture:** Maintains integrity under prolonged loading --- #### **4. Product Specifications** **Available Forms & Sizes:** - **Thickness:** 5mm to 150mm (0.187" to 6") - **Width:** 1000mm to 3000mm (39" to 118") - **Length:** 2000mm to 12000mm (78" to 472") - **Surface Finish:** Hot rolled, annealed, pickled, or machined **Standard Specifications:** - **Thickness Tolerance:** ±5% or ±0.25mm, whichever is greater - **Flatness:** Typically 5mm per meter maximum - **Straightness:** 1mm per meter maximum - **Surface Quality:** Free from defects per applicable standards --- #### **5. Product Applications** **Pressure Vessel Applications:** - **Reactor Vessels:** For chemical and petrochemical processes - **Heat Exchanger Shells:** Handling corrosive media - **Pressure Containment:** In oil and gas production systems - **Storage Tanks:** For aggressive chemicals and sour service **Chemical Processing:** - **Column Internals:** Trays, packing support plates - **Mixer Components:** Impellers, baffle plates - **Reactor Parts:** Agitators, internal structures - **Process Equipment:** Chambers, housings, covers **Oil & Gas Industry:** - **Wellhead Components:** Flanges, support plates - **Pipeline Equipment:** Valve bodies, compressor parts - **Subsea Structures:** Manifold plates, support frames - **Sour Service Applications:** H₂S and CO₂ resistant components **Marine & Offshore:** - **Seawater Handling:** Pump casings, valve bodies - **Structural Components:** In corrosive marine environments - **Desalination Plants:** Pressure vessel and heat exchanger plates --- #### **6. International Standards** **Material Standards:** - **UNS N09925**: Unified Numbering System designation - **ASTM B424**: Standard for Plate, Sheet, and Strip - **ASME SB424**: ASME Boiler and Pressure Vessel Code - **AMS 5895**: Aerospace Material Specification - **DIN 2.4852**: German Industrial Standard **Industry Specifications:** - **NACE MR0175/ISO 15156**: For sour service applications - **API 6ACRA**: Corrosion-resistant alloy applications - **ASME Section VIII**: Pressure vessel construction - **PED 2014/68/EU**: European Pressure Equipment Directive **Testing & Certification:** - **ASTM A578**: Ultrasonic Examination - **ASTM E112**: Grain Size Determination - **ASTM E384**: Microhardness Testing - **EN 10204 3.1/3.2**: Material certification --- #### **7. Corrosion Resistance** **Excellent Performance In:** - **Sour Gas Environments:** H₂S and CO₂ containing systems - **Chloride Solutions:** Superior stress corrosion cracking resistance - **Acidic Conditions:** Sulfuric, phosphoric, and organic acids - **Alkaline Media:** Good resistance to caustic environments - **Marine Atmospheres:** Excellent pitting and crevice corrosion resistance **Corrosion Performance:** - **Critical Pitting Temperature:** >85°C - **NACE TM0177:** Compliant for sour service - **General Corrosion Rate:** <0.1 mm/year in most chemical environments - **Intergranular Corrosion:** Resistant after proper heat treatment --- #### **8. Fabrication Characteristics** **Machining:** - **Machinability Rating:** 25-35% (compared to 1212 steel) - **Tool Materials:** Carbide tools recommended - **Cutting Speeds:** 15-25 m/min for milling operations - **Coolant Requirements:** Essential for optimum tool life **Welding:** - **Recommended Processes:** GTAW, GMAW, SMAW - **Filler Metals:** ERNiFeCr-1 or equivalent - **Preheat:** Generally not required - **Post-Weld Heat Treatment:** Recommended for aged material **Forming:** - **Cold Forming:** Best performed in annealed condition - **Hot Forming:** Temperature range 1050-1200°C - **Minimum Bend Radius:** 3 × thickness for 90° bends - **Springback:** Higher than carbon steels, requires compensation --- #### **9. Heat Treatment** **Standard Heat Treatment:** 1. **Solution Annealing:** 1095-1120°C (2000-2050°F) + rapid quench 2. **Aging Treatment:** 620-650°C (1150-1200°F) for 8-16 hours, air cool **Alternative Treatments:** - **Stress Relieving:** After heavy machining or forming - **Double Aging:** For enhanced strength properties - **Annealing Only:** For subsequent fabrication operations --- #### **10. Quality Assurance** **Testing Requirements:** - **Chemical Analysis:** Certified mill test reports - **Mechanical Testing:** Tensile, hardness, impact tests - **Non-Destructive Testing:** UT, RT, MT, PT as specified - **Dimensional Inspection:** To specified tolerances - **Surface Inspection:** Visual and dimensional checks **Certification:** - **Material Certificates:** EN 10204 3.1/3.2 - **NACE Compliance:** For sour service applications - **Third-Party Inspection:** Available as required - **Traceability:** Complete documentation from melt to final plate --- #### **11. Key Advantages** * **Superior Corrosion Resistance:** Excellent performance in sour service and chloride environments * **High Strength:** Maintains mechanical properties at elevated temperatures * **Excellent Fabricability:** Good weldability and formability * **Age-Hardenable:** Can be heat treated for optimal properties * **Industry Acceptance:** Complies with major international standards * **Long Service Life:** Reduced maintenance and replacement costs * **Versatile Applications:** Suitable for various industrial sectors Alloy 925 plate provides engineers and fabricators with a reliable, high-performance material solution for critical applications in oil & gas, chemical processing, marine, and power generation industries where both exceptional corrosion resistance and mechanical strength are required for safe and reliable operation.

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 2006 gallon liquid totes Special package is available on request.