Civen Metal Material (Shanghai) Co., Ltd. is one of the leading manufacturers and suppliers of high-strength ra bronze foil in China. Welcome to buy bulk durable high-strength ra bronze foil made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
High-Strength RA Bronze Foil is a cold-rolled copper-tin alloy developed for components that require higher tensile strength, controlled spring-back and electrical conductivity. Its rolled-annealed structure is suitable for precision forming processes where both mechanical properties and dimensional stability are important.
The material is available in coil or slit-strip form and can be used for precision stamping, chemical etching and micro-forming. Standard grades include CuSn6 (C51900) and CuSn8 (C52100), with custom phosphor-bronze variants available for specific material requirements.
Key Material
Alloy Grades:
The current product range includes CuSn6 (C51900), CuSn8 (C52100) and custom phosphor-bronze variants for applications requiring different combinations of strength and conductivity.
Chemical Composition:
The listed composition range includes 5.0% to 8.5% tin and 0.03% to 0.35% phosphorus. The final alloy composition can be selected according to the required material grade and mechanical properties.
Material Quality:
Vacuum induction melting (VIM) is used for the raw material preparation process. This supports controlled alloy quality before the material enters the cold-rolling process.
Performance Features
Fatigue Resistance:
The rolled-annealed structure is suitable for components exposed to repeated bending and cyclic mechanical loading.
Electrical Conductivity:
Electrical conductivity is specified at 12% to 20% IACS across the listed alloy and temper ranges.
Spring-Back Stability:
Controlled mechanical properties help support dimensional recovery after forming, making the material suitable for precision stamped and formed components.
Corrosion Resistance:
The copper-tin alloy provides resistance to atmospheric oxidation and tarnishing under normal environmental conditions.
Technical Specifications
| Parameter | Specification Range | Test Standard |
|---|---|---|
| Thickness | 0.015–0.50 mm | ISO 6892 / ASTM E345 |
| Width | 5–650 mm, slit edge | ASTM B248 |
| Tensile Strength (Rm) | 350–850 MPa, alloy/temper dependent | ISO 6892-1 |
| Elongation (A5) | 2–45% | ISO 6892-1 |
| Hardness | 90–240 HV | ASTM E384 |
| Surface Roughness (Ra) | ≤0.4 μm, mirror or matte | ISO 4287 |
| Camber / Bow | <1.0 mm per 1000 mm length | ASTM B248 |
Manufacturing & Quality Control
Cold Rolling:
Multi-high and Sendzimir rolling mills are used for controlled thickness reduction and mechanical property development. The current process information specifies thickness tolerance control within ±1%.
Annealing:
Bell-type furnaces with a hydrogen-nitrogen protective atmosphere are used for controlled annealing and oxidation protection during heat treatment.
Slitting:
Precision carbide rotary knife systems are used to produce slit widths and control the foil edge condition. The current process specifies edge burr control below 5% of foil thickness.
Inspection & Testing:
Production inspection includes 100% inline automated surface-defect scanning, optical emission spectroscopy (OES) and universal tensile testing.
Applications
Flexible Printed Circuits
Used in dynamic flex zones for electronic and automotive sensor applications where repeated bending and electrical conductivity are required.
Connectors & Terminals
Suitable for spring contacts and terminals requiring a combination of mechanical strength, forming performance and electrical conductivity.
Shielding Gaskets
Used for EMI/RFI shielding fingers and conductive seals that require both electrical contact and controlled mechanical properties.
Precision Micro-Springs
Applicable to miniature actuators and spring components used in aerospace and medical instrumentation.
Customization & OEM Supply
Tempers
Available in O, 1/4H, 1/2H, H, EH, SH and custom tensile-strength ranges according to application requirements.
Surface States
Available surface conditions include mill finish, degreased and passivated options.
Edge Conditions
Mill edge, precision slit edge and deburred round-edge options are available for different forming and processing requirements.
Traceability
Mill Test Certificates (MTC) are supplied according to EN 10204 3.1 for material traceability.
Packaging & Delivery
Coil Setup:
Available inner core diameters are 76 mm, 150 mm and 300 mm, using steel, aluminum or paper cores according to the coil configuration.
Protection:
Coils are interleaved with anti-corrosion paper, wrapped in PE film and vacuum-sealed with silica gel desiccant. Export-grade wooden crates are used for shipment protection.
FAQ
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