Silver Nickel Contact Strip for Stamping is a precision bimetal and solid electrical material designed for high-speed automated production of relays, switchgears, and low-voltage circuit breakers. Produced through cold-roll cladding and vacuum sintering, it integrates the high conductivity of fine silver with the arc-erosion resistance and hardness of nickel, delivering low contact resistance, superior anti-welding performance, and extended mechanical life under AC/DC switching loads.
Material Composition & Selection Guide
AgNi10 (90% Ag, 10% Ni): Highest conductivity in the family; optimal for low-contact-resistance switching under light to medium electrical loads.
AgNi15 (85% Ag, 15% Ni): Balanced composition offering improved mechanical hardness and enhanced resistance to electrical wear.
AgNi20 (80% Ag, 20% Ni): Standard industrial grade; provides high arc-erosion resistance and anti-welding under heavy contact force.
AgNi30 (70% Ag, 30% Ni): Maximum hardness and arc suppression; designed for severe mechanical stress and heavy-duty switching environments.
Core Performance Advantages
Sintered Microstructure: Fine-grain nickel dispersion prevents metal agglomeration, ensuring uniform thermal and electrical conductivity throughout the strip.
Metallurgical Bond Strength: Cold-roll cladding achieves over 98% interface bonding, preventing layer separation during high-speed progressive die stamping.
Tooling Protection: Controlled tensile strength and slitting burrs under 5% minimize progressive die wear and punch chipping.
Contact Stability: Low and predictable millivolt drop over thousands of continuous operations under inductive electrical loads.
Technical Specifications
|
Parameter |
Specification / Feature |
|
Thickness Range |
0.10 mm – 3.00 mm (±0.005 mm – ±0.015 mm) |
|
Width Range |
2.00 mm – 120.00 mm (±0.05 mm – ±0.10 mm) |
|
Electrical Conductivity |
60% – 88% IACS (grade dependent) |
|
Hardness Range |
70 HV – 160 HV (annealed to hard tempers) |
|
Elongation |
15% – 35% (supports tight bend radii) |
|
Cladding Ratio |
10% – 50% AgNi layer (0.02 mm – 1.20 mm) |
Supply Formats & Delivery Options
Coil Inner Diameter: 100 mm, 150 mm, 200 mm, or custom core adapters.
Coil Outer Diameter: Up to 800 mm to support automated feeder capacity.
Supply Options: Continuous pancake coils, traverse-wound spools for extended press runs, or precision cut-to-length strips.
Edge Conditioning: Slit square edge, deburred radius edge, or mill edge for stable press feeding.
Typical Engineering Applications
Miniature Circuit Breakers (MCB) & MCCB: Fixed and movable contact bridge assemblies.
Industrial & Automotive Relays: Terminal blades, reed contacts, and spring carriers.
AC Contactors & Starters: Auxiliary and main power switching contacts.
Wall Switches & Controls: Snap-action mechanisms and power switch components.
Comprehensive Customization Options
Cladding Topologies: Solid AgNi, Inlay, Onlay, Top-lay, and Overlay (Bimetal / Trimetal variants).
Substrate Base Metals: C1100 Copper, C2680 Brass, C5191 Phosphor Bronze, or CuNi alloys.
Plating & Finishes: Electro-plated Silver (0.5 µm – 5.0 µm), Nickel flash plating, or anti-tarnish protective chemical treatment.
Quality Assurance & Inspection
Continuous Eddy Current Testing: Online monitoring of cladding thickness and metallurgical bond continuity along the full coil length.
Metallographic Analysis: Cross-sectional microscopic verification of grain structure and layer interface integrity.
Mechanical Validation: Tensile, yield strength, and elongation testing for every production master coil.
Optical Profilometry: Laser micrometers for continuous real-time thickness measurement.
Packaging & Preservation Standards
Corrosion Inhibition: Sealed inside multi-layer VCI (Vapor Corrosion Inhibitor) vacuum bags with active desiccant packs.
Mechanical Protection: Rigid plastic edge guards and wooden spool reels to prevent edge damage during transport.
Shipping Crates: Heavy-duty, fumigated plywood cases reinforced with steel banding.
Traceability: Barcoded coil labels detailing heat number, alloy grade, dimensions, hardness, and net weight.
Frequently Asked Questions
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