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| Place of Origin | Changzhou |
| Brand Name | Joyruns |
| Certification | ISO9001,ROHS |
| Model Number | 4*0.6MM,4.2*0.6mm,4.76*0.7mm, 6*0.55mm |
ASTM A254-97 DC04 4*0.6mm Double Wall Copper coated Bundy Tube
Double Wall Brazed Steel Tube possesses higher withstanding pressure and higher vibration fatigue strength. Furthermore, the tube is also equipped with superior properties such as solderability, traceability, bendability, and workability in end terminal preparation. As a pressure tubing material with extensive reliability and good processing characteristics, this tube is used for several purposes, such as brake tubing, the power steering on vehicles, and many more.
Double Walled Steel Tubing is a steel tube for pressure piping, which is manufactured from electrolytic copper-coated steel strip (both surfaces). The strip is wound into a continuous tubular with a double-layered wall and then copper brazed in a special furnace using the coated copper as filler metal.
Standard dimension, tolerance, and withstand pressure
| Nominal diameter | Outer diameter (mm) | Wall thickness (mm) |
Guarantee pressure
(MPa) |
Burst pressure (MPa) | ||
|---|---|---|---|---|---|---|
| Standard dimension | Tolerance | Standard dimension | Tolerance | |||
| 4 | 4 | ±0.08 | 0.7 | ±0.08 | 34.3 | 108 |
| 4.76 | 4.76 | ±0.08 | 0.7 | ±0.08 | 34.3 | 108 |
| 6.35 | 6.35 | ±0.08 | 0.7 | ±0.08 | 34.3 | 83.3 |
| 8 | 8 | ±0.1 | 0.7 | ±0.1 | 24.5 | 66.2 |
| 10 | 10 | ±0.1 | 0.7 | ±0.1 | 24.5 | 53.9 |
Specification and Test
| Test Item | Technical Standard | Test result | |||||
| Mechanical Property | Tensile Strength290Mpa | 296Mpa | |||||
| Yield Strength 180Mpa | 185Mpa | ||||||
| Elongation20% | 30% | ||||||
| Wall Thickness | 0.70+-0.1mm | 0.71mm | |||||
| Flaring Test | Flaring25% | 30% | |||||
| Bending Test | Bend 180°C in a Radius Three Times of the Pipe Diameter | No Crafk or Peeling After Flaring | |||||
| Flattening Test | No Crack After Flattening | No Crack | |||||
| Pressure Test | No Leakage when Charged with 34.3Mpa Nitrogen Gas for 1min | No Leakage | |||||
| Thickness per Surface Treatment of Galvanize(μm) | 9μm | ||||||
| Thickness per Inner Treatment of Copper-Plating | 3μ | ||||||
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