ALLLAND Boiler Steel Pipe Supply
Welcome to ALLLANDA Steel Pipe Factory. Our pre-galvanized pipes utilize premium steel tubes that undergo continuous hot-dip galvanizing for zinc coating treatment, followed by welding of the required pipe sections. Equipped with a complete production line and extensive welding expertise, we ensure uniform zinc coating and smooth surfaces on post-welded pipes. Pre-galvanized pipes find extensive applications in steel structures, fencing, greenhouse construction, solar panel mounting systems, and related industries. We welcome inquiries and orders.
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Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience. The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines. With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!
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Pre-galvanized pipe are steel tubes that undergo surface zinc coating treatment. Before forming the steel tubes, the material undergoes continuous hot-dip galvanizing, creating a zinc layer on the surface. Subsequent processes such as welding are then performed. This galvanizing treatment effectively enhances the corrosion resistance of steel pipes, extends their service life, and finds widespread application in industries including construction, transportation, and power. During production, the zinc coating is primarily formed through either cold-galvanizing or hot-dip galvanizing processes. This coating bonds tightly to the steel substrate, delivering outstanding corrosion protection.
O.D.:
21.3mm to 323.9mm (common sizes)
W.T.:
1.0mm to 12mm (common range)
Length:
6m, 12m, 18m (customizable upon request)
Zinc Coating Thickness:
Single-sided: 4 μm – 13 μm, Double-sided: 8 μm – 26 μm
Standards:
ASTM A500 / A53, EN 10219 / EN 10305, GB/T 6728 / GB/T 3091
Steel Grades:
Q195 / Q215 / Q235, S235JR, DX51D + Z, ASTM A500 / A53
Surface Treatment:
Silver-white zinc bloom / Smooth finish
Pipe Ends:
Flat ends, Chamfered, Cut, Protective caps
| OD (mm) | WT (mm) | Weight(kg/m) | OD (mm) | WT (mm) | Weight(kg/m) |
| 21.3 | 1 | 0.84 | 76.1 | 1.8 | 3.92 |
| 21.3 | 1.2 | 1.01 | 76.1 | 2.5 | 5.42 |
| 21.3 | 1.5 | 1.28 | 76.1 | 3 | 6.51 |
| 21.3 | 2 | 1.61 | 89.1 | 2 | 4.48 |
| 33.7 | 1.2 | 1.46 | 89.1 | 3 | 6.71 |
| 33.7 | 1.5 | 1.81 | 114.3 | 2 | 5.51 |
| 33.7 | 2 | 2.29 | 114.3 | 3 | 8.26 |
| 33.7 | 3 | 3.36 | 114.3 | 4 | 10.98 |
| 42.4 | 1.5 | 2.14 | 139.7 | 3 | 9.56 |
| 42.4 | 2 | 2.67 | 139.7 | 4 | 12.47 |
| 42.4 | 3 | 3.99 | 168.3 | 3 | 11.44 |
| 48.3 | 1.5 | 2.34 | 168.3 | 4 | 14.84 |
| 48.3 | 2 | 2.91 | 219.1 | 4 | 18.87 |
| 48.3 | 3 | 4.34 | 219.1 | 5 | 23.73 |
| 60.3 | 1.5 | 2.72 | 273 | 5 | 29.72 |
| 60.3 | 2 | 3.41 | 273 | 6 | 35.7 |
| 60.3 | 3 | 5.09 | 323.9 | 6 | 41.47 |
| 76.1 | 1.8 | 3.92 | 323.9 | 8 | 55.2 |
Cold Rolled Steel Strip Preparation-Surface Cleaning & Pretreatment-Continuous Hot-dip Galvanizing-Cooling & Zinc Coating Control-Slitting & Coil Preparation-ERW Pipe Forming-High-frequency Welding-Sizing & Straightening-Cutting to Length-Inspection & Quality Control
• Small-diameter pipes (< 1 inch): Zinc coating thickness typically ranges between 45-75 microns.
• Medium-diameter pipes (1 inch – 4 inches): Zinc coating thickness generally ranges between 50-85 microns.
• Large-diameter pipes (>4 inches): Zinc coating thickness is typically between 65-100 microns.
Our company manufactures boiler tubes with an outer diameter (O.D.) range of 12.7 mm to 508 mm. The application scenarios, materials, and inspection methods vary for different sizes. Below is a detailed introduction to the specific applications of boiler tubes in different sizes.
Construction and Steel Structures
Building Supports
Scaffolding
Plumbing and Drainage
Fencing and Shelving
Industrial Barriers
Farm Fencing
Warehouse Shelving
Solar Energy and Greenhouses
Solar Panel Mounting Structures
Greenhouse Frameworks
Industrial and Furniture
Metal Tables and Chairs
Display Shelving
The zinc coating on pre-galvanized pipes may oxidize or melt at high temperatures, resulting in lower heat resistance compared to hot-dip galvanized pipes. Hot-dip galvanized pipes exhibit more stable performance in high-temperature environments. Therefore, hot-dip galvanized pipes are recommended for high-temperature or highly corrosive conditions.
The lifespan of pre-galvanized pipes depends on their environment and usage conditions. In standard non-corrosive environments, they typically last 15-30 years. In harsh conditions (such as highly industrial corrosive settings), their lifespan may shorten. Maintaining clean pipes and performing regular inspections and maintenance can extend their service life.
Pre-galvanized pipes are steel pipes that undergo zinc coating immersion before production to form a zinc layer. This process typically employs electroplating or hot-dip coating methods. Hot-dip galvanized pipes, however, involve immersing steel pipes in molten zinc at high temperatures to create a thicker zinc layer. Hot-dip galvanized pipes generally feature a thicker zinc coating, offering superior corrosion resistance and suitability for harsher environments, while pre-galvanized pipes are appropriate for standard conditions.
