Single Wall Double Wall Copper Coated Steel Tube Bundy Tube Single
Wall Steel Tube
Description:
Bundy tube, sometimes called Bundy pipe, is type of double-walled
low-carbon steel tube manufactured by rolling a copper-coated steel
strip through 720°F and resistance brazing the overlapped seam in a
process called Bundywelding. It may be zinc coated for corrosion
protection. It is primarily used in automotive hydraulic brake
lines in cars. We can supply any type and diameter of Bundy Tube
your requirement calls for.
2. Steel Grade
BHG1, SPCC, SPCD, SPCEN, ST14, ST15, ST16, DC04, DC05, DC06
3. Heat Treatment
BK or NBK
4. Specification
| OD mm | 4 | 4.2 | 4.76 | 6 | 6.35 | 7.8 | 8 | 9.52 |
| W T | 0.5-1.0mm (0.5-0.7mm common WT) |
| Tolerance | ±0.05mm |
| Length | 180Kg/coil; 700-1000m/coil; per customer’s request |
5. Production Process
Tube welding– Cold drawing (reduce diameter)– Annealing in
Protected Atmosphere— Cleaning-- Leakage detection– Zinc/Copper
Plating– Keep pressure (Airtightness) – Packing
6. Surface Treatment
| Coating | Thickness | Salt spray test duration |
| Copper/White Zinc/Colour-Zinc | 8μm | 72h |
| PVF | 8μm+20μm | 1000-2000h |
| Military Green Zinc | 8μm | 180h |
| GALFAN | 8μm+20μm | 1000-2000h |
| Nylon | 8μm+40μm | 180h |
7. Packing: In coil, in wooden box with seaworthy packing
8. Application
Fluid carrying system for automobiles
Fluid carrying system for refrigerators
Wire condenser for chillers, showcase
Vending machine, ice machine etc.
