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  • Galvanized Tubes
  • Galvanized Tubes

Galvanized TubesBack

With high quality cold-rolled welded steel belts, after a series of the most advanced process such as forming, high frequency induction welding, diameter reduction, annealing under shielding gas, galvanizing, etc. The quality can meet the standard of

1、Advanced production equipment, the testing instruments are complete and quality system are perfect.

 

2、High anti-corrosion resistance for salt spray test 150h.


Product parameter

Spec

¢7.8±0.08*0.6+0.03-0.02

¢4.76±0.08*0.6+0.03-0.02

¢4±0.05*0.5±0.03

External diameter(mm)

7.8±0.08

4.76±0.08

4±0.05

Thickness(mm)

0.6+0.03-0.02

0.6+0.03-0.02

0.5±0.03

Appearance

It shall be clean, smooth, free of scars, zinc particles, peeling, rust and corrosion spots, and the height of inner weld shall be ≤ 0.2mm (for wall thickness ≤ 0.5mm, the height of inner weld shall be ≤ 0.15mm)

Flatten Test

After flattening, the outer edge of the steel pipe shall be free of cracks, cracks or weld cracks

Flaring Test

Use ¢ 8.4 punch

Use ¢ 5.2 punch

Use ¢ 3.75 punch

The reaming shall be free of cracks, cracks or weld cracks. The pipe orifice at the reaming end shall be flush and the pipe shall be smooth and flat;

扭曲試驗Twisting Test

Insert the mandrel at both ends, and the twist angle is 3 * 360 ° on the left and right respectively. After the test, the steel pipe shall be free of wrinkles, cracks or other cracks

Bending Test


The bending core with a radius of 3 times the diameter of the steel pipe shall be used, and there shall be no wrinkles, cracks or other cracks after bending; The roundness (diameter difference) of the pipe section at the bend shall not be greater than 0.8

Outer coating

4-15 μ m. Coating adhesion: it is required to be dense and firmly bonded with the substrate

Salt

 Spray Test

No red rust in 48 hours

Internal

Cleaness

≤20mg/m2

Moisture

≤20mg/m2

Single

 Impurity

≤0.2mm

Tolerance

No turbidity, stratification and cloud

ROHS Test

Cd and compounds

<50

pb and compounds

<500

Hg and compounds

<500

Cr6+compounds

<500

























Cooperative partner

  • Galvanized Tubes

Application fields

Refrigeration Industry

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