China Pre-Galvanized Steel Pipe and Tubing Suppliers - Round, Square, Rectangular Factory Products
Pre-galvanized pipe, sometimes referred to as mill-galvanized or in-line galvanized pipe, utilizes a different method for zinc protection. Different from post-galvanizing (hot-dip galvanizing), pre-galvanizing uses a steel strip that has been galvanized when the strips are made into pipes in a continuous process.
The steel strip is galvanized and rolled into a tube using rollers. The edges of the tube are joined together with high-frequency induction welding. After welding is done, the exterior weld seam received a coating of zinc-rich invective spray to restore corrosion resistance.
This is very fast and makes very smooth and uniform pipe, making it visually pleasing for many different applications.
| Parameter | Details |
|---|---|
| Manufacturing Process | ERW process using pre-galvanized steel coils |
| Base Material Standard | ASTM A653, EN 10346 |
| Pipe Standard | EN 10219, BS 4568, JIS G3444 |
| Steel Grade | Q195, Q235, S235, DX51D |
| Size Range (OD) | 21.3mm – 165mm 1/2" – 6" |
| Wall Thickness (WT) | 0.8mm – 5.0mm |
| Zinc Coating | Typically Z80 to Z275 80–275 g/m² |
| Surface Finish | Bright, smooth, uniform |
| Pipe Ends | Plain End |