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Help CenterGalvanized Steel Pipe for Agricultural Irrigation Greenhouse Support Hot Dipped Zinc Coating ERW
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Hemaokang Steel (Shandong) Co., Ltd., located in Liaocheng, Shandong, China, is a professional manufacturer of welded steel pipes. Our hot-dipped galvanized ERW steel pipe is specifically designed for agricultural irrigation systems and greenhouse structures. It combines high-frequency electric resistance welding with a complete hot-dipped zinc coating, providing excellent corrosion protection, reliable pressure strength, and easy on-site fabrication. This pipe helps growers and contractors reduce long-term maintenance costs while maintaining stable performance in damp, outdoor, and chemically exposed environments.
The product is available in a wide range of outer diameters, wall thicknesses, and lengths. It can be used as a main water delivery line, branch pipe, greenhouse frame column, roof truss, or support post. Because the zinc layer is applied after welding, the weld seam and exposed edges receive much better protection than pre-galvanized pipes. The result is a robust, long-lasting steel pipe that meets the daily requirements of irrigation and agricultural construction.
Product Highlights
- Hot-dipped galvanized finish: The pipe is fully immersed in molten zinc, creating a dense, uniform coating on both interior and exterior surfaces.
- ERW precision welding: High-frequency electric resistance welding produces a clean seam and consistent wall strength for pressure and structural applications.
- Agricultural-grade corrosion resistance: Zinc protects against moisture, fertilizer, ultraviolet, and soil corrosion, extending service life even without frequent maintenance.
- Customizable dimensions: Outer diameter, wall thickness, length, and pipe ends can be tailored to project specifications.
- Easy installation and fabrication: The pipe can be cut, welded, threaded, grooved, or connected with standard fittings.
- Strong structural performance: Carbon steel substrate provides high load-bearing capacity for greenhouse frames and support columns.
- Eco-friendly and recyclable: Steel is recyclable, and the longer lifespan of galvanized pipe reduces material replacement frequency.
Technical Specifications
| Parameter | Value |
|---|---|
| Material | Carbon steel (Q195/Q235/Q345 optional) |
| Outer Diameter | 20 mm - 219 mm, customizable |
| Wall Thickness | 0.8 mm - 12 mm, customizable |
| Length | 5.8 m / 6 m / 11.8 m or custom |
| Zinc Coating | Hot-dipped galvanized, 200 g/m2 - 500 g/m2 |
| Processing Method | ERW + hot-dipped galvanizing |
| Pipe Ends | Plain, beveled, or threaded with coupling |
| Certification | ISO9001 |
Applications in Agricultural Irrigation
Galvanized steel pipe is a common choice for agricultural water delivery because it can handle pressure from centrifugal and submersible pumps while resisting soil moisture and mineralized water. The hot-dipped coating offers sacrificial protection: even if the surface is scratched during installation, the exposed steel is protected by the surrounding zinc. With the correct wall thickness and end connection, this pipe can be used in above-ground and buried irrigation networks. Its rigidity helps keep pipeline sections aligned across uneven farmland and minimizes sagging in exposed lines.
Applications in Greenhouse Support
Greenhouse frames are constantly exposed to condensation, irrigation mist, fertilizers, and sharp temperature changes. Hot-dipped galvanized pipe can resist these conditions and keep its structural integrity for many seasons. It supports plastic film, shade netting, drip irrigation lines, and ventilation systems without premature rust staining or deformation. The smooth zinc surface also reduces friction against greenhouse film, lowering the risk of tearing and simplifying cleaning.
More Product Advantages
- Reduced maintenance: The zinc coating minimizes rust maintenance and replacement costs over the project life cycle.
- Wide size availability: Common diameters and wall thicknesses are kept in regular production, while non-standard sizes are available upon request.
- Flexible packaging: Pipes can be bundled, plastic-capped, or delivered with protective end covers according to buyer requirements.
- Compatible fittings: Standard flanges, valves, elbows, clamps, and couplings are widely compatible with the pipe.
- Custom specifications: Length, zinc coating weight, end preparation, and marking can be adjusted to meet individual project needs.
Quality Control and Export Support
Our production process is controlled under an ISO9001 management system. Pipes are inspected for dimensional accuracy, coating thickness, surface appearance, and weld integrity before shipment. Because outer diameter and wall thickness are important for connecting irrigation systems, we check every batch to reduce installation problems. Custom cut lengths are also handled carefully to meet the exact project quantities requested by the buyer.
Hemaokang Steel (Shandong) Co., Ltd. has an annual export value of US$50 million to US$100 million and a team of 51 to 100 employees. Our factory is located in Liaocheng, Shandong, a major steel production base, and shipments are arranged from Qingdao port. We already serve markets across North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, East Asia, Western Europe, Central America, Northern Europe, Southern Europe, South Asia, and the domestic market. This global network gives us the experience to handle different packaging standards, documentation requirements, and handling conditions. We welcome buyers to request samples, drawings, or a detailed quotation. From one container to multiple container loads, we can schedule production to match your installation timeline.
Frequently Asked Questions
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What is the difference between hot-dipped galvanized and pre-galvanized pipe?
Hot-dipped galvanized pipe is immersed in molten zinc after steel pipe manufacturing, which creates a thicker coating on the entire pipe surface and weld seam. Pre-galvanized pipe uses a thinner zinc layer applied to steel sheet before forming, so the cut edges and welds can remain exposed. -
Can this pipe be used for greenhouse frames?
Yes. It is commonly used for greenhouse arches, side columns, roof supports, and cross braces. The galvanized surface resists condensation and fertilizer corrosion and supports greenhouse film without staining. -
Can the outer diameter and wall thickness be customized?
Yes. Outer diameter, wall thickness, length, and pipe end preparation can be customized according to your project design. Common sizes are available in our standard production range. -
Are end caps or thread protection available?
Yes. Threaded ends can be supplied with plastic caps or couplings, and plain ends can be protected with end caps upon request. -
How should the pipe be connected?
The pipe can be connected by threading, grooving, flanging, welding, or using mechanical fittings. The best method depends on the pipe diameter, pressure, and installation environment. -
Is the zinc coating uniform on the inside?
The hot-dipping process provides zinc coverage on both outside and inside surfaces of the pipe, although the coating thickness may vary slightly in the interior. Coating requirements can be discussed for specific applications. -
How does the pipe perform in high humidity?
The hot-dipped zinc coating is especially useful in high-humidity environments such as greenhouses and irrigation fields. It protects the steel base during moist conditions and reduces rust creep at cut edges. Cut ends can be touched up with zinc-rich paint if needed. -
What is the delivery lead time?
Lead time depends on pipe size, quantity, and surface treatment. We provide arrangements based on production schedules and shipment from Qingdao, and detailed timing is available upon request.
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