Civen Metal Material (Shanghai) Co., Ltd. is one of the leading manufacturers and suppliers of high-strength ra brass foil in China. Welcome to buy bulk durable high-strength ra brass foil made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
CIVEN Metal High-Strength Rolled-Annealed (RA) Brass Foil features a balance of mechanical strength, electrical conductivity, and formability. Produced via multi-stage cold rolling and controlled atmosphere annealing, the material maintains dimensional tolerances and uniform microstructures across long coils for high-speed stamping and micro-component manufacturing.
Key Material
Base Alloys: CuZn30 (C26800), CuZn37 (C27200), CuZn40 (C28000) per ASTM B36/B36M and EN 1652.
Chemical Composition: Copper 63.0% to 71.0%, Zinc balance, total impurities <= 0.1%.
Microstructure: Fully recrystallized equiaxed grain structure via continuous annealing, eliminating internal stresses and directional property variations.
Performance Features
Tensile Strength: 450 to 680 MPa (temper dependent: H02 to EH).
Elongation: >= 5% to 25% (tailored for deep drawing or sharp-radius bending).
Electrical Conductivity: 22% to 28% IACS at 20 deg C.
Formability: High Erichsen value, tight bending radius capability (R = 0 for thin gauges).
Surface Condition: Clean, oxide-free finish with Ra <= 0.4 um, optimized for plating, etching, or laser welding.
Technical Specifications
|
Parameter |
Specification Range |
Test Standard |
|
Thickness |
0.02 mm to 0.50 mm |
ISO 9222 / ASTM E252 |
|
Width |
10 mm to 600 mm |
Longitudinal edge slit |
|
Thickness Tolerance |
+/- 0.002 mm to +/- 0.005 mm |
Micrometer / Laser gauge |
|
Tensile Strength |
450 to 680 MPa |
ASTM E8 / EN 10002 |
|
Elongation (A50) |
5% to 25% |
ASTM E8 |
|
Hardness |
120 to 210 HV |
ASTM E384 (HV0.5) |
|
Coil ID |
76 mm, 150 mm, 300 mm |
Custom core options |
Manufacturing & Quality Control
Rolling: 20-high Sendzimir mills control cross-profile thickness within +/- 2 um.
Annealing: Continuous horizontal floating hydrogen-nitrogen atmosphere furnaces prevent oxidation and ensure uniform grain growth.
Slitting: Precision rotary shear lines yield burr-free edges (burr height < 5% of foil thickness).
Inspection:
100% online eddy current pinhole and defect scanning.
Batch destructive testing: Tensile, elongation, and Vickers hardness profiling.
Spectroscopic chemical analysis per melt lot.
Traceability: Master coils are laser-etched with a unique ID linked to the Material Test Certificate (MTC).
Applications
Precision Stamping
Terminal connectors, battery contact springs, micro-relays.
Electronics
FPC stiffeners, shielding cans, coaxial cable wrapping.
Automotive
EV busbar components, sensor diaphragms, ABS valve shims.
Heat Exchangers
Fin stock, radiator components.
Customization & OEM Supply
Mechanical Temper: Custom annealing schedules matched to target yield strength and elongation.
Surface Treatment: Anti-tarnish passivation, pre-cleaning for solderability, specific roughness modification.
Dimensions: Non-standard widths, cut-to-length sheets, master coil weight limits up to 500 kg.
Packaging & Delivery
Packaging Structure: Suspended wooden crates with multi-layer moisture barriers to protect edges during transit.
Inert Sealing: Vacuum-sealed anti-corrosion VCI film wrapping with integrated desiccant.
Logistics: Air and sea freight compliant export crating with shock absorption.
Why CIVEN Metal
Direct Mill Production: In-house melting, rolling, annealing, and slitting operations.
Process Stability: CpK >= 1.33 maintained on thickness, tensile strength, and width tolerance across continuous runs.
Documentation: Material Test Certificates (MTC) supplied with every shipment containing actual test metrics.
FAQ
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