Tinned Copper-clad Steel Wire (TCCS)

Tinned Copper-clad Steel Wire

Tin-plated copper-clad steel wire is a composite wire made of high-strength steel wire as the core material, coated with a copper layer on the outer layer and then tin plated. It combines the mechanical strength of steel, the conductivity of copper, and the corrosion resistance and weldability of tin, and is a core material in high-end electronics, marine engineering, and special industrial fields.

Core Features

High strength: The tensile strength of the steel core is 800~2000 MPa, which is 3~6 times that of pure copper wire.
Conductivity: The conductivity of the copper layer is ≥ 50% IACS (International Annealed Copper Standard), and the tin plating layer further optimizes high-frequency signal transmission.
Corrosion resistance: The tin layer isolates copper from contact with oxygen and sulfides, and has a salt spray resistance life of ≥ 20 years (in marine environments).
Weldability: Tin melting point is 232 ° C, with excellent compatibility with solder and a 30% increase in welding efficiency.

Manufacturing Process

The production process of tinned copper-clad steel wire includes steel core treatment → copper coating → tin plating → post-treatment, with the following steps:
Pre-treatment of Steel Core
Acid washing (10% H ₂ SO ₄ to remove oxide skin) → electrolytic degreasing (alkaline solution) → activation (fluoroboric acid).
Electroplated Copper
Plating solution: 200g/L copper sulfate+50g/L sulfuric acid, current density of 3 A/dm ², copper layer thickness of 10-50 μ m.
Electroplated Tin Plating
Plating solution: 100g/L tin methylsulfonate+additives (brightener, stabilizer), current density of 1.5 A/dm ², tin layer thickness of 5-20 μ m.
Post Processing
Passivation (chromate solution) → wax lubrication → winding.

Tinned Copper-clad Steel Wire List

Diameter	Tolerance	Elongation	Tensile Strength
0.080 -0.125 mm	+0.006, -0.003 mm	≥10%	≥380 MPa
0.125-0.400 mm	+0.008, -0.004 mm	≥10%	≥380 MPa
0.400-2.500 mm	+2%, -1%	≥15%	≥345 MPa

Tinned Copper-clad Steel Wire Application

Tin plated copper-clad steel wire combines the mechanical strength of steel, the conductivity of copper, and the corrosion resistance and weldability of tin, making it a core material in high-end electronics, marine engineering, and special industrial fields. It is widely used in the following scenarios:
Electronics and Communication
5G base station connector: Tin plated wire with a diameter of 0.5mm, high-frequency loss ≤ 0.1 dB/m (28GHz).
Chip packaging bonding wire: Ultra-fine wire (diameter 18 μ m), soldering strength ≥ 10 g.
Marine Engineering
Submarine optical cable armor layer: Stranded wire with a cross-sectional area of 200mm ², tensile strength ≥ 1800 MPa, and water resistance to a depth of 10000 meters.
Ship grounding system: Tin plated copper-clad steel wire braided tape, salt spray resistance ≥ 5000 hours.
Automotive Industry
High voltage wiring harness: Stranded wire with a cross-sectional area of 25mm ² and a temperature resistance of 150 °C (ISO 6722 standard).
Battery connector: Tin plated layer thickness of 30 μm, contact resistance ≤ 0.1mΩ.
Energy and Electricity
Photovoltaic welding strip: Flat wire with a thickness of 0.2 mm, welding efficiency ≥ 99% (EL detection without hidden cracks).
Transformer lead: Multi stranded wire (cross-sectional area 50 mm2), current carrying capacity 200A.
Military and Aerospace Industry
Missile wire: Tin plated layer with temperature resistance of -65 °C~200 °C and vibration resistance of 20G.
Satellite bracket: Lightweight stranded wire (density 7.5 g/cm ³), replacing titanium alloy to reduce costs by 50%.