Alloy 909,Incoloy 909 Strip,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 Strip (UNS N19909)** **Alloy 909** (commonly known as **Incoloy 909**) is a low thermal expansion, high-strength iron-nickel-cobalt superalloy supplied in strip form. This product is engineered for applications demanding exceptional dimensional stability under severe thermal cycling conditions. The strip form is particularly used where thin, precise, and consistent cross-sections are required for manufacturing high-integrity components. The alloy is strengthened by a precipitation-hardening heat treatment, which imparts high strength while maintaining the characteristic low coefficient of thermal expansion (CTE) from cryogenic temperatures up to approximately 425°C (800°F). --- #### **1. Chemical Composition** The chemical composition of Alloy 909 strip is tightly controlled to ensure consistent thermal and mechanical properties. 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 critical for age-hardening. The low Carbon and controlled Magnesium content are essential for good fabricability and structural stability during long-term exposure at high temperatures.* --- #### **2. Physical Properties** Alloy 909 strip exhibits a unique set of physical properties crucial for its intended applications. | 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 (Young's Modulus)** | 148 GPa (21.5 x 10⁶ psi) | | **Magnetic Permeability** | Essentially non-magnetic | --- #### **3. Mechanical Properties (Typical for Aged Condition - Strip)** The mechanical properties for strip are typically achieved after a solution anneal followed by a precise multi-step aging heat treatment. Properties can be tailored based on the final heat treatment. | Property | Typical Value (Aged) | | :--- | :--- | | **Tensile Strength** | 1100 - 1310 MPa (160 - 190 ksi) | | **Yield Strength (0.2% Offset)** | 960 - 1170 MPa (139 - 170 ksi) | | **Elongation (in 2 inches)** | 12% - 15% | | **Hardness (Rockwell C)** | 32 - 40 HRC | --- #### **4. Product Applications** Alloy 909 strip is used in high-precision applications where thin-gauge material must resist deformation under thermal stress. * **Aerospace & Gas Turbine Engines:** * **Turbine Case Seals:** Thin, flexible seals that maintain contact and containment under extreme thermal cycles. * **Shroud Ring Components:** Used in the engine's hot section to maintain tight clearances. * **Electronic and Precision Instrumentation:** * **Glass-to-Metal Seals:** Provides a hermetic seal with matched CTE to certain glasses and ceramics. * **Precision Bellows and Sensing Diaphragms:** For instruments measuring pressure or displacement in varying temperatures. * **Automotive (High-Performance & Racing):** * Turbocharger Seals and Components: Withstands high exhaust temperatures while maintaining dimensional integrity. --- #### **5. International Standards** Alloy 909 strip is covered by several international and industry-specific standards. It is critical to specify the product form ("Strip") when ordering. | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS N19909** | The universal material designation. | | **Aerospace Material (AMS)** | **AMS 5891** | Covers bar, forgings, and rings. While not exclusively for strip, its composition and heat treatment are often referenced. Strip is frequently supplied to more specific, proprietary standards. | | **ASTM International** | **ASTM B753** | Standard specification for Thermostat Metal Sheet and Strip. Alloy 909 can be supplied to the general requirements of this standard, though specific properties are usually defined by the purchaser. | | **Aerospace (Specific Form)** | **Various Proprietary Specifications** | Strip is most commonly procured to exact OEM (Original Equipment Manufacturer) standards from companies like GE Aviation, Rolls-Royce, and Pratt & Whitney. These specifications dictate precise chemistry, grain size, surface finish, temper, and heat treatment. | --- #### **Key Advantages of Alloy 909 Strip** * **Exceptional Dimensional Stability:** Very low CTE ensures minimal size change with temperature fluctuations. * **High Strength in Thin Sections:** Capable of achieving high yield and tensile strength even in very thin strip gauges. * **Excellent Fatigue Life:** Resists cracking under cyclic thermal and mechanical stresses, crucial for seals and bellows. * **Controlled Fabricability:** Can be blanked, formed, and stamped in the solution-annealed condition before final age-hardening to achieve high strength.

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 1995 gallon liquid totes Special package is available on request.