Nylon Coating Bundy Tube

Bundy tube, also called Bundy pipe, is a double wall copper brazed steel tube. The manufacture of Bundy tube is a continuous process of rolling a copper coated steel strip through 720 degrees, brazing the outer and inner circle of the strip together by the melted copper layer to form a round tube with a continuous circular seam, and annealing. We are using fully automatic production lines with online process monitoring and continuous fabrication of the Bundy tubes.
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  automotive industry.The tube can be provided in coils or cut to length,etc.Thickness of Nylon coating: ≥150μm.
If any questions,please contact sales@grandsteeltube.com

  • Description
  • Specifications
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Nylon coated steel brake line tubes are used by many automakers. The tubes with nylon coating is also called NyGAL coated brake lines.

It is defined as zinc-aluminum alloy as described in GALFAN , with min coating thickness 3 micrometer, i.e. 50 g/m2 per ASTM A875, followed by a topcoat of Nylon 11 or 12.

Appearance: The topcoat shall be uniform in color and free from discontinuities such as flow lines, pin holes, craters, or abnormal roughness. The topcoat shall be black in color unless otherwise specified on the engineering drawing

Film Thickness: The Nylon PA11 or PA12 topcoat shall have a min thickness of 150 μm, average thickness 170 μm.

Salt Spray Testing (Normal): 1000 hr min before white rust shows, and 12000 hr min before red rust shows;

Salt Spray Testing (Gravel Impact):  2000 hr min before red rust.

Outer  dia.
(φ)
Wall thickness
(mm)
Mechanical Property
 Weight
(g/m)
Weight
Zinc (g/m)
Weight  PVF (g/m)
Resistance to pressure (Mpa)
Length
(m/ton)
4.75(3/16″)
0.7
Yield Strength 6s ≥180Mpa
Elongation δ≥25%
Tensile Strength 6s ≥290Mpa
70
71
72
88
13889
6
91
92
93
70
10753
6.35(1/4″)
97
98
99
64
10101
8(5/16″)
125
127
128
51
7813
9.52(3/8″)
152
153
154
43
6494
10
160
162
163
41
6135
12
194
196
198
34
5051
8
1
172
174
175
72
5714
10
220
222
223
58
4484
12
270
272
274
48
3650
15
346
349
351
36
2849
Test item
Flaring Test  / Bending Test /  Flattening Test /  Pressure Test / Corrosion test
Galvanization and Coating Types
Mark
Type
typical appearance
Anti-corrosion time
A
Copper tube
Bright or light blue
6-8h
B
White zinc tube
Rainbow and white
24-36h
C
Color zinc tube
Yellow rainbow
72-96h
D
Olive green tube
Olive green or bronze color
96-144h
E
PVF tube(China)
Black
≥1000h
PVF tube(Dupont)
≥3000h

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:4.76x0.70mm,6.35x0.70mm,8x0.70mm,9.53x0.70mm,10x0.70mm,12x0.70mm other size like:4.00x0.5mm,3.18x0.7mm,2.60x0.50mm is also produced according the requirements.other sizes can be achieved after discussion.

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

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

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 tube  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 with competitive prices:white/yellow/olive green galvanized double wall bundy tubes,PVF bundy steel tubes;etc

We have been delivering these tubes to Peru,France,Russia,South Korea for the automotive industry,since 2006.etc.If any questions,you are more than welcome to contact sales@grandsteeltube.com

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