Alloy 925,Incoloy 925 Bar(Round bar, Flat bar),UNS N09925,E FORU

British Specs:，American Specs:，German Specs:

### **Product Datasheet: Alloy 925 / Incoloy 925 Bar (Round Bar & Flat Bar) UNS N09925** **Alloy 925** (commercially known as **Incoloy 925**) bar products are precipitation-hardenable nickel-iron-chromium alloys supplied in both round and flat bar forms. These product forms are specifically designed for manufacturing components that require exceptional strength, superior corrosion resistance in sour gas environments, and excellent mechanical properties at elevated temperatures. The availability in both round and flat bar configurations provides versatility for various machining and fabrication requirements across multiple industries. --- #### **1. Chemical Composition** The chemical composition of Alloy 925 bars is rigorously controlled to ensure consistent 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-chromium provides fundamental corrosion resistance, while titanium and aluminum enable age-hardening through gamma prime precipitation. Molybdenum and copper enhance resistance to reducing environments and sulfuric acid corrosion.* --- #### **2. Physical Properties** Alloy 925 bars exhibit consistent physical properties across all sections: | 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 per ASTM B425):** | Property | Round Bar | Flat Bar | |:---|:---|:---| | **Tensile Strength** | 1035 MPa (150 ksi) min | 965 MPa (140 ksi) min | | **Yield Strength (0.2% Offset)** | 860 MPa (125 ksi) min | 760 MPa (110 ksi) min | | **Elongation** | 15% min | 15% min | | **Reduction of Area** | 35% min | - | | **Hardness** | 269 - 321 HB | 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 at high temperatures --- #### **4. Product Specifications & Availability** **Round Bar:** - **Diameter Range:** 3mm to 500mm (0.125" to 20") - **Length:** Standard 3-6 meters, custom lengths up to 12 meters - **Surface Condition:** Hot finished, cold drawn, turned, ground, polished - **Tolerances:** ±0.1mm to ±1.0mm depending on diameter and condition **Flat Bar:** - **Thickness:** 5mm to 150mm (0.187" to 6") - **Width:** 20mm to 300mm (0.75" to 12") - **Length:** Standard 3-6 meters, custom lengths available - **Edge Condition:** As-rolled, machined, or precision ground --- #### **5. Product Applications** **Round Bar Applications:** - **Shafts and Axles:** For pumps, compressors, and marine propulsion - **Valve Stems and Trim:** In oil & gas production systems - **Fasteners:** High-strength bolts, studs, nuts for critical service - **Downhole Tools:** Mandrels, connectors, fishing tools - **Machined Components:** Bushings, bearings, sleeves, rollers **Flat Bar Applications:** - **Structural Components:** For corrosive environments - **Wear Strips and Guides:** In chemical processing equipment - **Brackets and Supports:** For marine and offshore structures - **Valve Bodies and Housings:** Machined from flat stock - **Heat Exchanger Components:** Support bars and grids --- #### **6. International Standards** **Material Standards:** - **UNS N09925**: Unified Numbering System designation - **ASTM B425**: Standard for Nickel-Iron-Chromium-Molybdenum-Copper Alloy Bar - **ASTM B564**: Standard for Nickel Alloy Forgings - **AMS 5895**: Aerospace Material Specification - **DIN 2.4852**: German Industrial Standard **Industry Specifications:** - **API 6ACRA**: For corrosion-resistant alloy applications - **NACE MR0175/ISO 15156**: Compliance for sour service - **ASME SB425**: American Society of Mechanical Engineers - **EN 10204 3.1/3.2**: Material certification standards **Quality Assurance:** - **Chemical Analysis:** Certified mill test reports - **Mechanical Testing:** Tensile, hardness, impact tests - **Non-Destructive Testing:** UT, MT, PT as required - **Dimensional Inspection:** To specified tolerances --- #### **7. Heat Treatment** **Standard Heat Treatment Cycle:** 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:** - **Double Aging:** For enhanced strength properties - **Stress Relieving:** After heavy machining operations - **Annealing Only:** For subsequent forming operations --- #### **8. Corrosion Resistance** **Excellent Performance In:** - Sour gas environments (H₂S, CO₂) - Chloride stress corrosion cracking - Seawater and marine atmospheres - Sulfuric and phosphoric acid services - Oxidizing and reducing environments **Typical Corrosion Rates:** - **NACE TM0177 Solution A:** Passes Method A testing - **5% NaCl + 0.5% Acetic Acid:** <0.1 mm/year - **Acidified Ferric Chloride:** Resists pitting and crevice corrosion --- #### **9. Fabrication Characteristics** **Machining:** - **Machinability Rating:** 25-35% (compared to 1212 steel) - **Tool Materials:** Carbide recommended for production runs - **Cutting Parameters:** Moderate speeds with positive rake angles - **Coolant Requirements:** Essential for optimum results **Welding:** - **Recommended Processes:** GTAW, GMAW, SMAW - **Filler Metals:** ERNiFeCr-1 or equivalent - **Preheat/Interpass:** Generally not required - **Post-Weld Heat Treatment:** Recommended for critical applications **Forming:** - **Cold Forming:** Best performed in annealed condition - **Hot Working:** Temperature range 1050-1200°C - **Annealing Required:** After severe cold forming operations --- #### **10. Key Advantages** * **Superior Strength:** High tensile and yield strength in aged condition * **Excellent SSC Resistance:** Proven performance in sour gas service * **Versatile Product Forms:** Available in round and flat bar configurations * **High Temperature Capability:** Maintains properties up to 650°C * **Broad Chemical Resistance:** Suitable for diverse corrosive environments * **Industry Acceptance:** Complies with major international standards * **Good Fabricability:** Can be machined, welded, and formed using standard methods Alloy 925 round and flat bars provide engineers and manufacturers with reliable, high-performance material solutions for critical components operating in the most demanding corrosive environments, particularly in oil & gas production, chemical processing, and marine applications where both mechanical strength and corrosion resistance are paramount.

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 2003 gallon liquid totes Special package is available on request.