Galvanized Steel Pipe – Versatile Tubing for Water and Gas Lines
Galvanized Steel Pipe – Versatile Tubing for Water and Gas Lines
Feature
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The production of Galvanized Pipe involves dipping steel tubes into molten zinc, where a metallurgical reaction bonds the zinc to the base metal. Before this step, each pipe goes through an acid bath to strip away mill scale and surface rust. After pickling, the pipes are rinsed in a solution—typically ammonium chloride, zinc chloride, or a blend of both—to prepare the surface for plating. They then enter the hot-dip bath, where the zinc coating forms.
This method delivers three key benefits: uniform coverage across the entire surface, tenacious adhesion that resists peeling, and extended service life. The reaction between the steel substrate and the molten zinc creates a zinc-iron alloy layer that is exceptionally dense. This intermediate layer, combined with the outer pure zinc coating and the inner steel core, forms a composite barrier that offers outstanding protection against corrosion in demanding environments.
1)Grade: Q345B, L245, J55
2)Outer Diameter: Φ17mm-273mm
3)Wall Thickness: 0.6mm-12mm
4)Length: 2m-5.8m/6m/12m ( We can adjust length according to your request)
5)Packing: standard sea-worthy packing
| DN | NPS | mm | STANDARD | EXTRA STRONG | SCH40 | |||
| THICKNESS (mm) | WEIGHT (kg/m) |
THICKNESS (mm) |
WEIGHT (kg/m) |
THICKNESS (mm) |
WEIGHT (kg/m) | |||
| 6 | 1/8 | 10.2 | 2.0 | 0.40 | 2.5 | 0.47 | 1.73 | 0.37 |
| 8 | 1/4 | 13.5 | 2.5 | 0.68 | 2.8 | 0.74 | 2.24 | 0.63 |
| 10 | 3/8 | 17.2 | 2.5 | 0.91 | 2.8 | 0.99 | 2.31 | 0.84 |
| 15 | 1/2 | 21.3 | 2.8 | 1.28 | 3.5 | 1.54 | 2.77 | 1.27 |
| 20 | 3/4 | 26.9 | 2.8 | 1.66 | 3.5 | 2.02 | 2.87 | 1.69 |
| 25 | 1 | 33.7 | 3.2 | 2.41 | 4.0 | 2.93 | 3.38 | 2.50 |
| 32 | 1 1/4 | 42.4 | 3.5 | 3.36 | 4.0 | 3.79 | 3.56 | 3.39 |
| 40 | 1 1/2 | 48.3 | 3.5 | 3.87 | 4.5 | 4.86 | 3.68 | 4.05 |
| 50 | 2 | 60.3 | 3.8 | 5.29 | 4.5 | 6.19 | 3.91 | 5.44 |
| 65 | 2 1/2 | 76.1 | 4.0 | 7.11 | 4.5 | 7.95 | 5.16 | 8.63 |
| 80 | 3 | 88.9 | 4.0 | 8.38 | 5.0 | 10.35 | 5.49 | 11.29 |
| 100 | 4 | 114.3 | 4.0 | 10.88 | 5.0 | 13.48 | 6.02 | 16.07 |
| 125 | 5 | 139.7 | 4.0 | 13.39 | 5.5 | 18.20 | 6.55 | 21.77 |
| 150 | 6 | 168.3 | 4.5 | 18.18 | 6.0 | 24.02 | 7.11 | 28.26 |
| 200 | 8 | 219.1 | 6.0 | 31.53 | 6.5 | 30.08 | 8.18 | 42.55 |
1. Thick and Uniform Coating
Galvanized Steel Pipe receives a hot-dip zinc layer that is consistently thicker than electro-galvanized alternatives. The immersion process ensures complete coverage, including the inner wall and threaded ends, eliminating bare spots that could become corrosion starting points.
2. Strong Adhesion That Won't Peel
The metallurgical reaction between molten zinc and steel creates a bonded zinc-iron alloy layer that becomes part of the pipe itself. Unlike spray-on or paint coatings that can chip or flake, the zinc layer on Galvanized Steel Pipe stays firmly attached—even under bending, cutting, or threading operations.
3. Extended Service Life with Minimal Maintenance
The combination of thick zinc coating and strong adhesion gives Galvanized Steel Pipe a significantly longer lifespan than uncoated or painted steel. In most atmospheric conditions, the pipe can last decades without rust-through, reducing replacement frequency and ongoing maintenance costs for plumbing, structural, and industrial applications.
Galvanized Tubing serves a wide range of industrial and residential applications. In the energy sector, it is commonly used for gas transmission lines and heating system networks. For fluid transport, the pipe handles low-pressure delivery of water, oil, and other general media. The petroleum industry relies on it for oil well pipes and long-distance oil pipelines, with particular demand in offshore oil field operations. Additional uses include oil heaters, condensation coolers, and heat exchangers in chemical coking equipment. Infrastructure projects employ Galvanized Tubing as pipe piles for trestle bridges and support frames in mine tunnels.
One area of concern, however, involves its historical use in residential water supply systems. Over time, galvanized water pipes develop internal rust scale that reduces flow and discolors water. The rough inner surface can harbor bacteria, while corrosion may release heavy metals into drinking water—a health risk that has led many regions to phase out Galvanized Tubing for potable water applications.
Application
As China metal materials industry leading enterprises, the national steel trade and logistics "Hundred good faith enterprise",China steel trade enterprises, "Top 100 private enterprises in Shanghai”. Shanghai Zhanzhi industry Group Co., Ltd.,(shorted to Zhanzhi Group) takes the" Integrity, Practicality, Innovation, Win-Win " as its sole operation principle, always persist in putting the customer demand in the first place.
- INTEGRITY
- WIN-WIN
- PRAGMATIC
- INNOVATION
