Premium Hot-Dip Galvanized Steel Pipe
Our Galvanized Steel Pipes are engineered for superior corrosion resistance and extended service life. Through the professional hot-dip galvanizing process, a thick and uniform zinc-iron alloy layer is formed, providing exceptional adhesion and structural integrity. Ideal for water transport, construction, and heavy industrial applications.
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Process: Hot-dip Galvanized (recommended) and Cold Galvanized.
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Standards: ASTM A53, BS 1387, EN 10255, AS 1074, JIS G3444, GB/T 3091.
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Size Range: DN6 to DN150 (1/8″ to 6″ NPS).
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Key Benefits: Uniform coating, strong adhesion, high durability, and low maintenance.
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Applications: Construction, machinery, coal mining, chemical industry, electric power, railways, bridges, and highway facilities.
Description
Product Overview
Galvanized steel pipe is divided into cold galvanized pipe and hot-dip galvanized pipe. Hot-dip galvanized pipe involves a complex physical and chemical reaction between the molten metal and the iron matrix to form a corrosion-resistant zinc-iron alloy layer. This layer is integrated with the pure zinc layer and the steel tube matrix, resulting in strong corrosion resistance.
While cold galvanized pipes (electro-galvanized) are prohibited for use as water and gas pipes in many regions due to their thin zinc layer and poor corrosion resistance, our Hot-dip Galvanized pipes are widely used for their uniform coating, strong adhesion, and long service life.
Executive Standards & Steel Grades
| Standard | Steel Grade / Material |
|---|---|
| ASTM A53 | Grade A, Grade B |
| BS 1387 / EN 10255 | Class L, Class M, Class H |
| AS 1074 | C250, C350 |
| JIS G3444 | STK400, STK500 |
| GB/T 3091 | Q195, Q215, Q235, Q345 |
Technical Specifications
| Nominal Size (DN) | NPS (inch) | Outside Diameter (mm) | Wall Thickness (mm) | |
|---|---|---|---|---|
| Series 1 | Series 2 | |||
| DN6 | 1/8 | 10.3 | 2.0 | – |
| DN8 | 1/4 | 13.7 | 2.2 | 2.0 |
| DN10 | 3/8 | 17.1 | 2.3 | 2.0 |
| DN15 | 1/2 | 21.3 | 2.8 | 2.3 |
| DN20 | 3/4 | 26.7 | 2.8 | 2.3 |
| DN25 | 1 | 33.4 | 3.4 | 2.8 |
| DN32 | 1 1/4 | 42.2 | 3.6 | 2.8 |
| DN40 | 1 1/2 | 48.3 | 3.7 | 2.8 |
| DN50 | 2 | 60.3 | 3.9 | 3.3 |
| DN65 | 2 1/2 | 76.1 | 4.2 | 3.4 |
| DN80 | 3 | 88.9 | 4.5 | 3.7 |
| DN100 | 4 | 114.3 | 5.1 | 4.1 |
| DN125 | 5 | 141.3 | 5.5 | 4.5 |
| DN150 | 6 | 168.3 | 5.9 | 4.7 |
Manufacturing Process
Our hot-dip galvanizing process follows a rigorous sequence to ensure quality:
Black Pipe → Inspection → Cleaning/Degreasing → Rinsing → Pickling (Acid Washing) → Rinsing → Fluxing → Drying → Hot-dip Galvanizing → Cooling → Passivation → Final Inspection → Marking → Packing.
Technical Workflow of the Hot-Dip Galvanizing Process
Applications
Galvanized steel pipes are indispensable in various sectors due to their versatility and strength:
- Infrastructure: Bridges, highway facilities, and railway construction.
- Building & Construction: Scaffolding, fire sprinkler systems, and structural frames.
- Industrial: Machinery manufacturing, chemical industrial equipment, and coal mine support.
- Transportation: Oil, gas, and water transmission pipelines, as well as vehicle components.