Phone / WhatsApp:
+86-13288385958
E-mail: sale20@shunbeifactory.com
E-mail: sale20@shunbeifactory.com
Xingye 9th Road, Guanglong Industrial Zone, Yongxing village, Chencun Town, Shunde District, Foshan City, Guangdong, China
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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
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| 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. | |||||||||
Product Details
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
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.
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.
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.
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.
