Alloy 909,Incoloy 909 Sheet,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 Introduction: Alloy 909 / Incoloy 909 / UNS N19909 Sheet** **Alloy 909** (commercially known as **Incoloy 909**) is a low thermal expansion, high-strength iron-nickel-cobalt superalloy designed for applications requiring exceptional dimensional stability under extreme temperature fluctuations. Its key characteristic is a controlled coefficient of thermal expansion (CTE) that is extremely low over a wide range from cryogenic temperatures to about 425°C (800°F). This, combined with its high strength and good fatigue resistance, makes it an ideal material for demanding aerospace and industrial applications. The alloy is strengthened by age-hardening and exhibits good ductility and fracture toughness in both the annealed and aged conditions. It is available in various forms, including sheet, strip, bar, and wire. --- #### **1. Chemical Composition** The composition of Alloy 909 is meticulously balanced to achieve its unique low thermal expansion and high-temperature strength. 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: The addition of Niobium and Titanium enables age-hardening. The low Carbon and controlled Magnesium/Silicon content enhance stability and fabricability.* --- #### **2. Physical Properties** Alloy 909 exhibits a unique set of physical properties that distinguish it from other superalloys. | 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) | | **Electrical Resistivity** | 1.05 μΩ·m | | **Modulus of Elasticity** | 148 GPa (21.5 x 10⁶ psi) | | **Magnetic Permeability** | Essentially non-magnetic | --- #### **3. Mechanical Properties (Typical for Aged Condition - Sheet/Strip)** The mechanical properties are typically achieved after a solution anneal followed by a multi-step aging heat treatment. | Property | Value | | :--- | :--- | | **Tensile Strength** | 1100 MPa (160 ksi) min | | **Yield Strength (0.2% Offset)** | 960 MPa (139 ksi) min | | **Elongation (in 2 inches)** | 12% min | | **Hardness (Rockwell C)** | 32 - 40 HRC | --- #### **4. Product Applications** Alloy 909 is primarily used in high-precision applications where components must maintain their dimensions despite severe thermal cycling. * **Aerospace & Gas Turbine Engines:** * Seals and rings for turbine casings * Exhaust system components * Mounting rings and support structures * **Electronic and Precision Instrumentation:** * Glass-to-metal seals * Resonators and frequency control devices * **Nuclear Reactors:** * Instrumentation ports and sensor housings * **Automotive (High-Performance):** * Turbocharger components --- #### **5. International Standards** Alloy 909 is covered by several international material and specification standards to ensure quality and consistency. | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS N19909** | The standard material designation in North America. | | **Aerospace Material (AMS)** | **AMS 5891** | Covers bar, forgings, and rings. | | **ASTM International** | **ASTM B753** | Standard specification for Thermostat Metal Sheet and Strip (can reference similar alloys, but Alloy 909 is often supplied to customer-specific requirements based on AMS). | | **Aerospace (Specific Form)** | **Various Proprietary & Customer Specifications** | Sheet and strip are often procured to specific OEM standards (e.g., from GE, Rolls-Royce, Pratt & Whitney) that detail exact heat treatment, testing, and tolerances. | --- #### **Key Advantages Summary** * **Controlled Low Thermal Expansion:** Maintains dimensions from cryogenic to high temperatures. * **High Strength-to-Weight Ratio:** Excellent mechanical properties at elevated temperatures. * **Good Fabricability:** Can be formed and machined using standard methods, though it is a tough material. * **Excellent Fatigue Resistance:** Suitable for cyclic loading applications. * **Age-Hardenable:** Allows for optimization of strength through heat treatment. For specific procurement, it is crucial to reference the exact standard and heat treatment condition required for your application.

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 1994 gallon liquid totes Special package is available on request.