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.
CIVEN Metal manufactures rolled annealed (RA) bronze foil for mechanical and electronic applications requiring high fatigue strength and dimensional stability. Utilizing multi-pass cold rolling and controlled-atmosphere annealing lines, our strip maintains tight thickness tolerances and uniform microstructures across the entire coil length.
Key Material
Alloy Grades: CuSn6 (C51900) and CuSn8 (C52100) phosphor bronze.
Chemical Composition: Tin (Sn) controlled between 6.0% and 8.0%; phosphorus (P) micro-alloying maintained at 0.03% to 0.35% for deoxidation and wear enhancement.
Microstructure: Uniform equiaxed grain structure via continuous strand annealing, preventing spring-back variation during stamping.
Performance Features
Fatigue Resistance: Withstands continuous cyclic bending loads without micro-fracturing.
Antifriction Properties: Low coefficient of friction against hardened steel shafts, minimizing galling in sliding contacts.
Corrosion Resistance: Forms a stable copper-tin oxide passive film against atmospheric oxidation.
Thermal Stability: Maintains mechanical integrity up to 250°C.
Technical Specifications
|
Parameter |
Standard Range / Specification |
|
Thickness |
0.015 mm - 0.50 mm (Tolerance: ±0.001 mm available) |
|
Width |
5 mm - 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 (Dependent on alloy and temper) |
|
Elongation |
2% - 45% |
|
Conductivity |
12% - 20% IACS at 20°C |
|
Surface Finish |
Bright annealed, matte, or micro-grooved (Ra <= 0.2 um) |
Manufacturing & Quality Control
Rolling: High-rigidity Sendzimir mills equipped with automatic gauge control (AGC) eliminate longitudinal thickness variations.
Annealing: Continuous bell-type furnaces operate under pure hydrogen-nitrogen protective atmospheres to prevent oxidation.
Slitting: Rotary shear lines utilize tungsten carbide blades, controlling edge burrs and camber deviations within 0.5 mm per 1000 mm.
Inspection: Inline laser micrometers track thickness profiles. Universal tensile testers verify mechanical properties per ASTM E8/E8M; optical microscopes verify grain size per ASTM E112. Every master coil ships with an MTC.
Applications
Connectors
Terminal springs, battery contact plates, and IC lead frames.
Tribological Parts
Wear shims, thrust washers, and sliding guides in hydraulic actuators and automotive transmissions.
Electronics
Shielding layers and conductive traces in high-flex flat cables (FFC).
Instruments
Bourdon tubes, bellows, and pressure gauge diaphragms.
Customization & OEM Supply
Dimensions: Non-standard thicknesses and slit widths produced to customer blueprints.
Surface Treatments: Selective tin-plating, nickel underplating, or passivation coatings.
Packaging: Horizontal suspension packaging or vertical eye-to-sky wooden pallets for automated uncoiling.
Sampling: Prototype trial coils (5 kg - 25 kg) supplied with metallurgical data packages.
Packaging & Delivery
Internal Protection
Coils interleaved with VCI paper and wrapped in moisture-barrier polyethylene film.
External Armor
Secured with corrugated cardboard protectors inside fumigation-free wooden export crates or steel-banded pallets.
Logistics
Direct mill shipments via air or ocean freight with complete customs documentation, bill of lading, and MSDS.
Why CIVEN Metal
Direct Mill Production: Vertically integrated operations from raw alloy casting to precision slitting ensure tight cost and quality control.
Tolerances: Thickness tolerances maintained strictly within half of standard commercial limits.
Traceability: Full lot tracking from raw metal ingot to finished coil output via documented QA checkpoints.
FAQ
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