Civen Metal Material (Shanghai) Co., Ltd. is one of the leading manufacturers and suppliers of wear-resistant ra bronze foil in China. Welcome to buy bulk durable wear-resistant ra bronze foil made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
Key Material
Alloy Grades：
Available grades include CuSn6 (C51900) and CuSn8 (C52100) phosphor bronze, providing options for applications with different mechanical and electrical requirements.
Chemical Composition：
The current specification lists tin (Sn) content from 6.0% to 8.0% and phosphorus (P) content from 0.03% to 0.35%. Controlled alloy composition supports consistent material properties across the foil.
Microstructure：
Controlled annealing is used to produce a uniform equiaxed grain structure, supporting consistent forming and stamping behavior in thin-gauge applications.
Performance Features
Fatigue Resistance：
The rolled-annealed structure is suitable for components exposed to repeated bending and cyclic mechanical movement, including spring contacts and flexible electrical components.
Antifriction Properties：
The copper-tin alloy is suitable for sliding-contact components where wear resistance, surface condition and dimensional stability are important considerations.
Corrosion Resistance：
The copper-tin alloy provides resistance to atmospheric oxidation, supporting applications where the foil may be exposed to normal environmental conditions.
Thermal Stability：
The current product information specifies mechanical stability for applications exposed to temperatures up to 250°C.
Technical Specifications
| Parameter | Standard Range / Specification |
|---|---|
| Alloy Grades | CuSn6 (C51900), CuSn8 (C52100) |
| Thickness | 0.015–0.50 mm |
| Thickness Tolerance | ±0.001 mm available |
| Width | 5–650 mm |
| Slitting Precision | ±0.05 mm |
| Tempers | Annealed (O), 1/4 Hard (1/4H), 1/2 Hard (1/2H), Full Hard (H) |
| Tensile Strength | 350–850 MPa |
| Elongation | 2–45% |
| Conductivity | 12–20% IACS at 20°C |
| Surface Finish | Bright annealed, matte, or micro-grooved |
| Surface Roughness | Ra ≤0.2 μm |
Manufacturing & Quality Control
Rolling：
Multi-pass cold rolling is used to control the foil thickness and mechanical condition across the coil. Automatic gauge control helps maintain consistent thickness during production.
Annealing：
Controlled-atmosphere annealing is used to develop the required microstructure while limiting surface oxidation during heat treatment.
Slitting：
Precision rotary slitting is used to produce the required coil widths and control edge quality. The current process specifies camber deviation within 0.5 mm per 1000 mm.
Inspection：
Inline thickness measurement and mechanical testing are used for process and product inspection. Grain structure is checked by metallographic examination, and each master coil is supplied with a Mill Test Certificate (MTC).
Applications
Connectors
Used for terminal springs, battery contact plates and IC lead frames where thin-gauge material, mechanical flexibility and electrical conductivity are required.
Tribological Parts
Suitable for wear shims, thrust washers and sliding guides used in hydraulic actuators and automotive transmission components.
Electronics
Applicable to shielding layers and conductive traces in high-flex flat cables (FFC), where repeated flexing and controlled foil dimensions are important.
Instruments
Used for Bourdon tubes, bellows and pressure gauge diaphragms requiring thin metal sections with controlled mechanical properties.
Customization & OEM Supply
Dimensions：
Non-standard thicknesses and slit widths can be produced according to customer drawings and application requirements.
Surface Treatments：
Available options listed for this product include selective tin-plating, nickel underplating and passivation coatings.
Packaging：
Packaging formats include horizontal suspension packaging and vertical eye-to-sky wooden pallets for different handling and uncoiling requirements.
Sampling：
Prototype trial coils from 5 kg to 25 kg are available for product evaluation and can be supplied with metallurgical data packages.
Packaging & Delivery
Internal Protection
RA bronze foil coils are interleaved with VCI paper and wrapped with moisture-barrier polyethylene film to protect the material during storage and transportation.
External Protection
The packaged coils are secured with corrugated cardboard protection and placed in fumigation-free wooden export crates or steel-banded pallets.
Logistics
The current product information lists air and ocean freight for direct mill shipments, with customs documentation and shipping documents provided for international orders.
FAQ
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