1. Definition & Origin

2. Manufacturing & Internal Structure

1. Raw material: Thin low-carbon steel strip with copper cladding on the surface;
2. Forming: The steel strip is rolled and folded into a double-layer tubular shape with an overlapping seam;
3. Sealing: High-temperature resistance brazing fuses the entire overlapping seam into an integrated airtight pipe wall (360° full welding, zero leakage risk);
4. Anti-corrosion treatment: Final galvanizing or black electrophoretic coating to resist rust.

3. Core Performance Advantages

1. Ultra-high pressure & vibration resistance

   Double-layer steel structure delivers 30% higher burst strength and fatigue resistance than single-layer copper/aluminum tubes. It withstands long-term vibration and refrigerant pressure fluctuations without cracking or leaking, widely recognized for automotive brake pipelines.

2. Complete airtightness

   Full circumferential brazed seam eliminates hidden leakage points, stable for sealed refrigeration fluid circulation.

3. Excellent bendability & processing performance

   Soft steel substrate allows repeated serpentine/S-shaped bending to make compact condenser coils, perfectly matching wire tube condenser assembly.

4. Significant cost advantage

   Material cost far lower than pure copper tube, effectively cutting the total cost of refrigeration heat exchangers while maintaining mechanical reliability.

5. Anti-corrosion coating

   Copper inner coating + outer zinc/black paint layer slows oxidation and rust inside the pipe.

4. Main Application Scenarios

1. Refrigeration Industry (your core product field)

   Wire Tube Condenser / Evaporator for household refrigerators, commercial freezers, display coolers, industrial air conditioners; the black wire mesh radiators you provided are all made of Bundy tubes.

2. Automotive Industry

   Automotive hydraulic brake pipelines, fuel transmission tubes, oil cooler coils (the earliest mainstream application of Bundy tube).

3. Other industrial equipment

   Small hydraulic pipelines, cooling coils for machinery, instrument fluid delivery tubes.

5. Difference vs Copper Tube

• Bundy Tube: Steel base, high mechanical strength, low cost, lower thermal conductivity; relies on dense wire mesh fins to compensate heat dissipation efficiency.
• Pure Copper Tube: Superior thermal conductivity, better corrosion resistance, much higher material cost, weaker pressure and anti-extrusion capacity.