White Galvanized Bundy Tube

The bundy steel tube has fine inside cleanness, high strength, nice elongation, good foundation for late process , anti leakage, anti high pressure explosion, excellent anti corrosion power after surface treatment. It is an ideal material for tubes of condensation , evaporation and autos.
The tube can be provided in coils or cut to length,etc.
Thickness of zinc may reach 8um,12um,15um,20um,25um.
If any questions,welcome to contact sales@grandsteeltube.com

  • Description
  • Baosheng's Advantages
  • Chemical Composition & Mechanical Properties
  • Inquiry

Bundy tubes are fully monitored during the tube fabrication, and also gone through a series of inspections to make sure they are safe and reliable for hydraulic uses.

Test and inspection items specified in standards of different countries are generally the same or very similar. We manufacture the tubes and issue test reports as per Chinese standard if no other particular requirement comes from buyers.

One thing to note is that the material listed in those standards are slightly different among countries. Low carbon steel is required commonly, but the chemical composition of the material varies, especially for carbon. In most of these countries, the steel grade exists already in their steel industry. In China, there is equivalent steel grades, but we specially developed a steel grade, BHG2, that is much more suitable for the double wall brazed steel tubing manufacture, perfect mechanical properties for the tube forming and also for the final tubes.

When tube is formed and brazed in the continuous production line, instant Eddy current automatic inspection system keeps detecting any potential imperfections of inner structure of the tube. Once the imperfections are detected, they will be automatically shown and notified by the system:

  1. An alarm sound is triggered and broadcast by a loud speaker.
  2. A flashing alert light on the machine shall be turned on.
  3. An automatic online printer shall mark the tube sections with imperfections with ink, then the imperfect tube sections shall be cut and removed.

The following tests shall be done to make sure the tubes are suitable for hydraulic applications of automobiles.

  1. Tensile test.
  2. Hardness test.
  3. Bending test.
  4. Expansion test.
  5. Developing test.
  6. Flattening and bending test.
  7. Pressure-proof test.
  8. Burst pressure test.

The following tests shall be conducted to determine how the surface coating/plating performs when protecting the tube from corrosion.

  1. Coating/plating thickness test.
  2. Corrosion resistance test (neutral salt spray, i.e. NSS).
  3. Film performance test (varies according to coating/plating types).

If any questions,you are more than welcome to contact sales@grandsteeltube.com

Our workshop,located in Changzhou,covers an area of 13,000 square meters equipped with the state-of-art facilities to manufacture the double wall bundy steel tubes and single wall bundy steel tubes .

The monthly production capacity is 3,000,000 meters.

The materials are :SPCC,SPHC,SPCE,BHG1,BHG2,other materials can be achieved after discussion.

Mainly sizes are:4.76×0.70mm,6.35×0.70mm,8×0.70mm,9.53×0.70mm,10×0.70mm,12×0.70mm other size like:4.00×0.5mm,3.18×0.7mm,2.60×0.50mm is also produced according the requirements.other sizes can be achieved after discussion.

1. Production of  double wall  bundy steel tubes since 2005.

2. Working with customers from Europe,West Asia,South America,since 2006.

3.  Samples can be delivered within 10 days after confirmation

4.  40 days as the production period and delivery after order confirmation.

5.  200,000 meters of copper coated bundy steel tubes in stock.

6.  Sizes can be offered from OD:2.60mmxWT:0.5mm to OD:12.7mmxWT:1.24mm

7.  Third party inspection like:TUV,BV,SGS,etc accepted

8.  Professional team assists your special tube requirements.

9. Other related tubes can be offered :yellow/black/olive green galvanized bundy tubes,PVF bundy tubes;etc

We have been delivering these tubes to Peru,France,Russia,South Korea for the automotive industry,since 2011.etc.If any questions,you are more than welcome to contact sales@grandsteeltube.com

OD Tolerance Wall Thickness Tolerance
<3/16"  (<4.76mm) ±0.0020" (±0.05mm)    0.03"    (0.7mm) ±0.0031" (±0.08mm)
3/16"~5/16" (4.76mm~8mm) ±0.0031" (±0.08mm)    0.039"     (1mm)  ±0.0039"    (0.1mm)
>5/16"  (>8mm) ±0.0059" (±0.15mm)

Chemical Composition
Element C Si Mn P S Alt
‰Max 0.6 0.3 3 0.3 0.3 0.2
Mechanical Properties
Tensile Strength 42000psi (290MPa)
Yield Strength 26100psi (180MPa)
Elongation ≥25%
Expansion ≥20%
Inside Surface Cleanliness ≤0.16g/m2

If any questions,you are more than welcome to contact sales@grandsteeltube.com

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