Alloy 260， Sheet，UNS N03260,E FORU

British Specs:，American Specs: AMS 5890 Bar and Forgings，German Specs:

### **Product Datasheet: Alloy 260 (Cartridge Brass, 70/30) Sheet** **UNS Designation:** UNS C26000 **Common Names:** Cartridge Brass Sheet, 70/30 Brass Sheet #### **1. Overview** Alloy 260 is a single-phase alpha brass renowned for its exceptional ductility and cold-working properties. With a nominal composition of 70% copper and 30% zinc, this alloy represents the most versatile and widely used brass formulation. In sheet form, Alloy 260 is primarily specified for applications requiring deep drawing, stamping, and forming operations, combined with good strength and an attractive appearance. Its historical name "Cartridge Brass" derives from its original use in ammunition casings, which demanded superior formability - a characteristic that makes it equally valuable for modern manufacturing processes. #### **2. Key Characteristics** * **Excellent Cold Workability:** Ideal for deep drawing, bending, stamping, and spinning without intermediate annealing * **High Machinability:** Rated at 100% machinability (Free-Cutting Brass C36000 = 100%) * **Good Strength-to-Weight Ratio:** Provides structural capability while maintaining formability * **Superior Surface Quality:** Capable of taking high-quality polished and plated finishes * **Good Corrosion Resistance:** Suitable for atmospheric, fresh water, and steam services * **Excellent Electrical & Thermal Conductivity:** Approximately 28% IACS electrical conductivity * **Ease of Joining:** Readily soldered, brazed, and welded using standard techniques ***Service Limitation:*** *Alloy 260 is susceptible to dezincification in stagnant, slightly acidic, or soft waters. For such environments, inhibited brass alloys (UNS C44300, C68700) are recommended.* --- #### **3. Chemical Composition (Weight % - ASTM B36 Specification)** | Element | Content (%) | | :--- | :--- | | Copper (Cu) | 68.5 - 71.5 | | Zinc (Zn) | Remainder | | Iron (Fe) | ≤ 0.05 | | Lead (Pb) | ≤ 0.07 | | Other Elements (Total) | ≤ 0.15 | *The low lead content makes Alloy 260 sheet suitable for applications with environmental restrictions and food contact applications where permitted by relevant regulations.* --- #### **4. Physical Properties (Typical)** | Property | Value | | :--- | :--- | | Density | 8.53 g/cm³ (0.308 lb/in³) | | Melting Point (Liquidus) | 955 °C (1750 °F) | | Melting Point (Solidus) | 915 °C (1680 °F) | | Thermal Conductivity | 120 W/m·K | | Electrical Conductivity | 28% IACS | | Coefficient of Thermal Expansion | 20.2 × 10⁻⁶/°C (20-300°C) | | Modulus of Elasticity | 110 GPa (16 × 10⁶ psi) | --- #### **5. Mechanical Properties (Typical by Temper)** | Condition | Tensile Strength (MPa) | Yield Strength (0.5% Ext, MPa) | Elongation (% in 2 in) | Hardness (Rockwell B) | | :--- | :--- | :--- | :--- | :--- | | **O60 (Annealed)** | 325 - 410 | 75 - 145 | 55 - 65 | 40 - 60 | | **H01 (1/4 Hard)** | 380 - 450 | 125 - 240 | 40 - 55 | 65 - 75 | | **H02 (1/2 Hard)** | 415 - 485 | 205 - 330 | 25 - 45 | 75 - 85 | | **H04 (Hard)** | 485 - 565 | 395 - 485 | 8 - 20 | 85 - 92 | --- #### **6. International Standards** Alloy 260 sheet complies with numerous international specifications: * **ASTM (USA):** * **ASTM B36:** Brass Plate, Sheet, Strip, and Rolled Bar * **ASME (USA):** * **ASME SB36:** Pressure Vessel Application * **EN (European Norm):** * **EN 1652:** Copper and copper alloys - Plate, sheet, strip and circles * **Material Designation:** CW508L (Formerly CW505L) * **DIN (Germany):** * **DIN 17660:** CuZn30 (CZ106) * **JIS (Japan):** * **JIS H3100:** Copper and copper alloy sheets, plates and strips * **Alloy Designation:** C2600 * **ISO:** * **ISO 426-1:** Wrought copper-zinc alloys --- #### **7. Product Applications** Alloy 260 sheet is specified across diverse industries for both functional and decorative applications: * **Automotive Industry:** * Radiator cores, tanks, and components * Electrical connectors and terminals * Decorative trim and emblems * **Electrical & Electronics:** * Waveguides, electrical shields * Switch components, connector bodies * RFI/EMI shielding applications * **Building & Architecture:** * Decorative wall panels, ceiling systems * Architectural grilles, kick plates * Door and window components * **Consumer Goods:** * Appliance trim, nameplates * Jewelry, craft materials, artistic sculptures * *Costume jewelry components* * **Industrial Components:** * *Gaskets, stampings, drawn shells* * *Lighting fixtures, reflector shells* * *Chemical process components* --- #### **8. Disclaimer** This information is provided for reference purposes only and represents typical values and applications. The suitability of Alloy 260 sheet for specific applications depends on service conditions, environment, mechanical requirements, and regulatory compliance. Users should consult official material standards and qualified engineering resources for critical applications. Performance can be affected by factors including temper, fabrication methods, and specific chemical environments. Always verify compliance with relevant safety and regulatory standards before specification.

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 2813 gallon liquid totes Special package is available on request.