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DC51 Galvanized Steel Pipe | SGCC Hot Dipped Galvanised Steel Tubing for Sale
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DC51 Galvanized Steel Pipe | SGCC Hot Dipped Galvanised Steel Tubing for Sale

  • 12M, 6m, 6.4M
  • ASTM ASME SUS JIS DIN
  • Square/ Rectangular/Round
  • ERW
  • DC51D+Z
  • 30% TT in advance, 70% TT /70% LC at sight balance before shipment
  • support
  • FOB, EXW, CIF, CFR
  • Steel
  • Galvanized
  • 10 TON
  • Construction, machinery, coal mining, chemical industry, electricity
  • DOWNLOAD CATALOG.pdf

    Galvanized steel pipe is a welded steel pipe with hot-dip galvanizing on the surface. Galvanizing can increase the corrosion resistance of steel pipes and extend their service life. Galvanized pipes are widely used. In addition to being used as pipeline pipes for general low-pressure fluids such as water, gas, and oil, they are also used as oil well pipes and oil pipelines in the petroleum industry, especially offshore oil fields, oil heaters, condenser coolers, coal distillation and washing oil exchangers in chemical coking equipment, as well as scaffolding for construction and support frames for mine tunnels.

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|PRODUCT DESCRIPTION

Hot-dip galvanized pipes use an advanced process in which molten metal reacts with an iron matrix to form an alloy layer, ensuring a perfect combination of the matrix and the coating. After pickling and cleaning, hot-dip galvanized pipes have a uniform coating, strong adhesion and a long service life. Its unique physical and chemical reactions form a corrosion-resistant zinc-iron alloy layer, which greatly improves corrosion resistance.

Shape Square,Rectangular,Round
Thicknes
 0.25-60mm or Require
Length 1-12m or Require
Place of Origin China
Technique ERW
Processing Service
Welding, Punching, Cutting, Bending, Decoiling
Application Fluid Pipe, Boiler Pipe, Drill Pipe,Structure Pipe
MOQ 5 TON

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DC51+Z GALVANIZED PIPE CHEMICAL COMPOSITION

Element Composition (%)
Carbon (C) ≤0.18
Silicon (Si) ≤0.5
Manganese (Mn) ≤1.2
Phosphorus (P) ≤0.12
Sulfur (S) ≤0.045
Titanium (Ti) ≤0.3

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PRODUCT SHOW

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DETAILS SHOW QUALITY

STRONG CORROSION RESISTANCE

The hot-dip galvanized steel pipe forms an alloy layer through the reaction of molten metal and iron matrix, which has the characteristics of corrosion resistance, can effectively resist the corrosion of the atmosphere, water and chemical media, and prolong the service life.

UNIFORM COATING

The hot-dip galvanizing process can ensure that the surface coating of the steel pipe is uniform, without pores and oxides, which improves the beauty and durability of the steel pipe.

STRONG ADHESION

The alloy layer of the hot-dip galvanized steel pipe is integrated with the pure zinc layer and the steel pipe matrix, with strong adhesion and not easy to peel off. It can maintain stability in various harsh environments and ensure the safe operation of the pipeline.

Specification

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GALVANIZED STEEL PIPE SPECIFICATION

Out Diameter
Wall Thickness
Square Pipe/Tube(mm)
Rectangular Pipe/Tube(mm)
Inch
mm
mm
16×16×0.4~1.5
70×70×2.0~6.0
10×20×0.6~1.5
30×60×1.0~4.5
1/2
21.3
0.6-3.0
18×18×0.4~1.5
75×75×2.0~6.0
14×21×0.6~1.5
40×50×1.0~4.5
3/4
26.9
0.6-3.0
20×20×0.4~1.5
80×80×2.0~6.0
15×30×1.5~1.5
40×60×1.0~5.0
1
33.4
1.0-3.0
25×25×0.6~2.0
85×85×2.0~6.0
15×38×0.6~1.5
40×80×1.5~5.0
1 1/4
42.3
1.0-4.0
30×30×0.6~4.0
95×95×2.0~8.0
20×30×0.6~2.0
40×100×2.0~5.0
1 1/2
48.3
1.0-4.0
34×34×1.0~2.0
100×100×2.0~8.0
20×40×0.8~2.0
50×60×2.0~5.0
2
60.3
1.5-4.0
35×35×1.0~4.0
120×120×4.0~8.0
20×50×1.0~2.0
50×80×2.0~5.0
2 1/2
76.1
1.5-4.0
38×38×1.0~4.0
150×150×6.0~10.0
22×35×0.9~2.0
50×100×2.0~8.0
3
88.9
1.5-9.5
40×40×1.0~4.5
180×180×6.0~12.0
25×40×0.9~3.75
60×80×2.0~6.0
4
114.3
2.0-9.5
44×44×1.0~4.5
200×200×6.0~12.0
25×65×1.0~2.0
80×100×2.0~8.0
5
141.3
3.0-9.5
45×45×1.0~5.0
220×220×6.0~14.0
30×40×1.0~3.75
120×60×2.5~10.0
6
168.3
3.0-12.0
50×50×1.0~5.0
250×250×6.0~14.0
30×45×1.0~3.75
120×80×2.5~10.0
8
219.1
3.2-12.0
60×60×1.5~5.0
30×50×1.0~4.0
10
273
3.2-12.0
12
323.8
6.0-15.0
14
355.6
8.0-15.0
16
406.4
8.0-20.0

Production process

1.Pre-treatment and Cleaning

  • Surface Cleaning: Start with solvent cleaning to remove any organic contaminants, followed by a wire brush or mechanical tools to eliminate rust, loose scale, and welding slag.
  • Enhanced Pickling: Ensure thorough pickling in acid baths to remove residual oxides. Implement quality control measures for bath concentration and exposure time, as these directly affect the quality of the zinc bond.
  • Rinse and Activation: After pickling, use a mixed aqueous solution of ammonium chloride and zinc chloride to activate the steel surface, which promotes strong adhesion of the zinc coating.

2. Galvanizing Process (Hot-Dip vs. Cold-Dip)

  • Hot-Dip Galvanizing: Prioritize hot-dip galvanizing for stronger corrosion resistance due to its dense zinc-iron alloy layer. This alloy layer is structurally bonded with the steel, providing a highly durable coating. Key considerations include:
    • Uniform Heating: Ensure that the temperature in the hot-dip bath is consistent, as fluctuations can cause uneven coating thickness.
    • Controlled Immersion and Withdrawal Rates: This can help achieve uniform zinc thickness and avoid zinc spatter or excessive buildup.
    • Optimize Alloying Reaction Time: Minimize excessive zinc-iron reactions that could lead to brittleness, ensuring optimal corrosion resistance and coating adhesion.
  • Cold Galvanizing: Given its relatively weak corrosion resistance, cold galvanizing should be minimized, particularly for pipes used in high-exposure environments like water and gas. Industry standards are shifting away from electro-galvanizing due to its tendency to peel and lack of durability.

3. Post-Treatment and Quality Control

  • Passivation Treatment: Post-galvanizing passivation can further improve corrosion resistance by sealing the zinc surface.
  • Regular Inspection: Employ non-destructive testing methods, like magnetic thickness measurement, to ensure coating uniformity and adequate layer thickness for each batch.
  • Adopt Anti-Rust Treatments for Cold-Galvanized Pipes: If cold galvanizing is necessary, consider adding a secondary anti-rust treatment layer or coating to enhance the corrosion resistance of these pipes.

4. Upgrade Equipment and Technology

  • Use Advanced Equipment: Upgrading to modern galvanizing lines with precise control systems can improve efficiency, reduce waste, and ensure a consistent product.
  • Automation: Implement automated monitoring for bath composition, temperature, and immersion times, which can enhance consistency and reduce human error.
  • Compliance with Standards: Adhere to industry standards by avoiding cold-dip processes for applications involving water and gas piping, aligning with regulatory guidelines for galvanized products.