Alloy 909,Incoloy 909 Fittings,UNS N19909,E FORU

British Specs:，American Specs:AMS 5884 Bars, Forgings, Rings AMS 5892 Sheet, Strip AMS 5893 Bars, Forgings, Rings，German Specs:

### **Product Datasheet: Alloy 909 / Incoloy 909 Fittings (UNS N19909)** **Alloy 909** (commercially known as **Incoloy 909**) is a low thermal expansion, high-strength iron-nickel-cobalt superalloy. When manufactured into **fittings** (such as flanges, unions, elbows, and ferrules), it is designed for high-performance piping and instrumentation systems that operate under severe thermal cycling and demanding mechanical stress. These components maintain structural integrity and dimensional stability from cryogenic temperatures up to about 425°C (800°F), preventing leakage and failure in critical systems. The alloy is supplied in a precipitation-hardened (aged) condition, providing an optimal combination of high strength, excellent fatigue resistance, and the characteristic low coefficient of thermal expansion (CTE). --- #### **1. Chemical Composition** The chemical composition of Alloy 909 fittings is meticulously controlled to ensure consistent performance in critical applications. The typical composition (by weight %) is as follows: | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 38.0 - 41.0 | | **Cobalt (Co)** | 13.0 - 17.0 | | **Iron (Fe)** | Balance | | **Niobium (Nb)** | 4.5 - 5.5 | | **Titanium (Ti)** | 1.3 - 1.8 | | **Silicon (Si)** | 0.40 - 0.80 | | **Aluminum (Al)** | 0.03 max | | **Carbon (C)** | 0.04 max | | **Manganese (Mn)** | 0.50 max | | **Magnesium (Mg)** | 0.003 - 0.012 | | **Sulfur (S)** | 0.004 max | | **Phosphorus (P)** | 0.010 max | | **Boron (B)** | 0.003 max | *Note: Niobium and Titanium are the primary age-hardening elements. The low Carbon and controlled Magnesium/Silicon content enhance weldability and long-term thermal stability.* --- #### **2. Physical Properties** Alloy 909 fittings exhibit a unique set of physical properties that make them ideal for thermally dynamic systems. | Property | Value / Description | | :--- | :--- | | **Density** | 8.23 g/cm³ (0.297 lb/in³) | | **Melting Range** | ~1430°C (2600°F) | | **Coefficient of Thermal Expansion (CTE)** | **Very Low.** Typically 5.9 - 7.1 x 10⁻⁶/°C (20-400°C) | | **Thermal Conductivity** | 11.5 W/m·K (at 100°C) | | **Specific Heat** | 460 J/kg·K (at 100°C) | | **Modulus of Elasticity** | 148 GPa (21.5 x 10⁶ psi) | | **Magnetic Permeability** | Essentially non-magnetic | --- #### **3. Mechanical Properties (Typical for Fittings in Aged Condition)** Fittings are machined from aged bar stock or forged and then fully heat-treated to achieve these mechanical properties. | Property | Typical Value | | :--- | :--- | | **Tensile Strength** | 1100 MPa (160 ksi) min | | **Yield Strength (0.2% Offset)** | 960 MPa (139 ksi) min | | **Elongation (in 2 inches / 50mm)** | 12% min | | **Hardness (Rockwell C)** | 32 - 40 HRC | --- #### **4. Product Applications** Alloy 909 fittings are specified in systems where standard stainless steel or nickel-alloy fittings would fail due to thermal stress or loss of clamp load. * **Aerospace & Gas Turbine Engines:** * **Fuel & Hydraulic System Fittings:** Critical connections in high-pressure systems subject to temperature variations. * **Exhaust & Bleed Air System Ducting Flanges:** Maintains bolt load and seal integrity under rapid thermal cycles. * **High-Performance Automotive & Racing:** * **Turbocharger Plumbing:** Unions and connectors for charge air and oil lines experiencing high heat. * **Nuclear Instrumentation:** * **Sensor Housing Fittings (e.g., Thermocouple Wells):** Provides stable mounting for instrumentation penetrating reactor vessels or high-temperature process systems. * **Process Industry:** * **Fittings for High-Temperature Process Lines:** Used in systems where thermal fatigue is a primary concern. --- #### **5. International Standards** Alloy 909 fittings are manufactured to meet stringent international and industry-specific standards governing their material, dimensions, and testing. | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS N19909** | The universal material designation. | | **Aerospace Material (AMS)** | **AMS 5891** | Standard for bars, forgings, and rings. This is the primary material specification for the stock used to manufacture Alloy 909 fittings. | | **ASTM International** | **ASTM B710 / B710M** | Standard Specification for Welded Nickel-Alloy Pipe. While for pipe, its chemical and mechanical requirements are often referenced for fitting qualifications. | | **Dimensional Standards** | **ASME B16.11, MS33675, MS21902** | These standards define the dimensions, tolerances, and pressure ratings for forged steel sockets, welding fittings, and JIC flare fittings. Alloy 909 fittings are machined to these standard geometries. | | **Aerospace (Specific)** | **Various Proprietary Specifications** | Fittings are often procured to exact OEM standards (e.g., from GE, Safran, Honeywell) that specify additional requirements for NDE (Non-Destructive Examination), heat treatment, and certification. | --- #### **Key Advantages of Alloy 909 Fittings** * **Maintained Clamp Load:** Low CTE ensures that bolts do not loosen significantly in fittings and flanges during temperature changes, preventing leaks. * **High Strength-to-Weight Ratio:** Provides excellent mechanical performance, allowing for robust yet potentially lighter-weight designs. * **Excellent Thermal Fatigue Resistance:** Withstands repeated heating and cooling cycles without cracking, which is critical for connections in dynamic systems. * **Good Weldability:** Can be welded to similar alloys using appropriate procedures (e.g., TIG welding with matching filler metal), enabling the fabrication of complex systems. For procurement, it is essential to specify both the material standard (e.g., AMS 5891) and the dimensional standard (e.g., ASME B16.11, 3000lb, Socket Weld Elbow) to ensure correct performance and interchangeability.

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 1996 gallon liquid totes Special package is available on request.