Alloy 260， Strip，UNS N03260,E FORU

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

### **Product Datasheet: Alloy 260 (Cartridge Brass, 70/30) Strip** **UNS Designation:** UNS C26000 **Common Names:** Cartridge Brass Strip, 70/30 Brass Strip #### **1. Overview** Alloy 260 strip represents the premium form of 70/30 brass for precision applications requiring consistent gauge thickness and superior surface quality. As a single-phase alpha brass, it delivers exceptional ductility and cold-working characteristics in thin, rolled sections. The strip form is specifically engineered for high-volume manufacturing processes where dimensional accuracy, surface finish, and consistent mechanical properties are critical. Its combination of formability, strength, and electrical conductivity makes it indispensable for electronic components, precision stampings, and decorative applications. #### **2. Key Characteristics** * **Superior Cold Workability:** Excellent for deep drawing, stamping, bending, and forming operations * **Precision Gauge Control:** Maintains consistent thickness for high-volume manufacturing * **Excellent Surface Quality:** Suitable for premium finishes including plating, polishing, and coating * **High Machinability:** 100% machinability rating ideal for secondary operations * **Good Spring Properties:** In harder tempers, provides adequate springback for contact applications * **Excellent Electrical Conductivity:** ~28% IACS for electrical and electronic applications * **Good Corrosion Resistance:** Performs well in atmospheric and indoor environments ***Processing Note:*** *Alloy 260 strip is particularly susceptible to stress corrosion cracking when cold worked and exposed to ammonia or amine compounds. Proper stress relief is recommended for parts in demanding environments.* --- #### **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 controlled chemistry ensures consistent forming characteristics and eliminates intermetallic phases that could affect surface quality in thin sections.* --- #### **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) | | :--- | :--- | :--- | :--- | :--- | | **O60 (Annealed)** | 325 - 410 | 75 - 145 | 55 - 65 | RB 40 - 60 | | **H01 (1/4 Hard)** | 380 - 450 | 125 - 240 | 40 - 55 | RB 65 - 75 | | **H02 (1/2 Hard)** | 415 - 485 | 205 - 330 | 25 - 45 | RB 75 - 85 | | **H04 (Hard)** | 485 - 565 | 395 - 485 | 8 - 20 | RB 85 - 92 | | **H08 (Spring)** | 520 - 600 | 450 - 520 | 5 - 12 | RB 91 - 96 | --- #### **6. International Standards** Alloy 260 strip complies with these international specifications: * **ASTM (USA):** * **ASTM B36:** Brass Plate, Sheet, Strip, and Rolled Bar * **ASTM B569:** Narrow Strip for Electrical Components * **EN (European Norm):** * **EN 1652:** Copper and copper alloys - Plate, sheet, strip and circles * **EN 12166:** Copper and copper alloys - Wire for general purposes * **Material Designation:** CW508L * **DIN (Germany):** * **DIN 17660:** CuZn30 (CZ106) * **DIN 1785:** Spring brass strip * **JIS (Japan):** * **JIS H3100:** Copper and copper alloy sheets, plates and strips * **Alloy Designation:** C2600 * **ISO:** * **ISO 426-3:** Wrought copper-zinc alloys - Strip --- #### **7. Product Applications** Alloy 260 strip serves critical functions across multiple precision industries: * **Electronics & Electrical:** * Electrical contacts, connectors, and terminals * RFI/EMI shielding shells and components * Lead frames, switch components, and relay parts * **Automotive Systems:** * Fuse clips, terminal blocks, and connector components * Sensor components and mounting brackets * Lighting system contacts and reflectors * **Communications:** * Waveguide components, coaxial connector bodies * Shielding for cellular and communication equipment * **Precision Engineering:** * Snap-action spring components, diaphragms * Precision stampings for instruments and controls * Bellows and flexible couplings * **Consumer Products:** * Watch cases, jewelry components, eyeglass frames * Zippers, fasteners, and decorative trim * Award medallions, nameplates, and badges --- #### **8. Disclaimer** This information is provided for technical reference only and represents typical values for Alloy 260 strip. Specific properties may vary depending on manufacturer, processing history, and gauge. Users should evaluate material suitability for their specific application requirements, including environmental factors, mechanical stresses, and regulatory compliance. Consultation with technical experts and review of complete material specifications is recommended for critical applications.

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 2814 gallon liquid totes Special package is available on request.