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Help Center2 Inch 3 Inch 4 Inch Galvanized Steel Pipe Schedule 40 Q235 ASTM A53 ERW Zinc Coated for Water Supply
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Welcome to Hemaokang Steel (Shandong) Co., Ltd., your trusted partner for high-quality steel piping solutions. Our 2 inch, 3 inch, and 4 inch Galvanized Steel Pipe Schedule 40 are manufactured from premium Q235 material and comply with ASTM A53 standards, ensuring exceptional durability and performance in water supply systems. With our ISO9001 certification and a strong export track record exceeding US$50 million annually, we deliver reliable products that meet the demands of diverse global markets.
These pipes are produced using advanced Electric Resistance Welding (ERW) technology, followed by a thorough hot-dip galvanizing process that provides a uniform zinc coating. This combination offers excellent corrosion resistance, making them ideal for underground and above-ground water pipelines, irrigation systems, and structural applications. Our commitment to quality control ensures every pipe meets strict dimensional and mechanical specifications.
Key Features and Technical Specifications
- Material: Q235 carbon steel, known for its good weldability and strength.
- Manufacturing Process: ERW (Electric Resistance Welded) ensures consistent wall thickness and smooth surface.
- Coating: Hot-dip galvanized (zinc coating) provides long-lasting protection against rust and corrosion.
- Standards: Fully compliant with ASTM A53 Grade B and Schedule 40 specifications.
- Size Range: Available in 2 inch (DN50), 3 inch (DN80), and 4 inch (DN100) nominal diameters.
- Length: Standard 6 meters, with customizable lengths available upon request.
- End Finish: Plain ends, beveled ends, or threaded options as needed.
- Application: Perfect for water supply lines, fire protection systems, gas pipelines, and structural supports.
Dimensional and Mechanical Parameters
| Nominal Size (inch) | Outside Diameter (mm) | Wall Thickness (mm) | Weight per Meter (kg) | Working Pressure (PSI) |
| 2 inch | 60.3 | 3.91 | 5.44 | 700 |
| 3 inch | 88.9 | 5.49 | 11.29 | 650 |
| 4 inch | 114.3 | 6.02 | 16.07 | 600 |
Note: The above values are based on Schedule 40 dimensions. Actual working pressure may vary with application conditions. Please consult our technical team for specific requirements.
Advantages and Benefits for Your Project
- Corrosion Resistance: The zinc coating acts as a sacrificial layer, protecting the steel from rust and extending service life by 20-30 years in typical environments.
- High Strength: Q235 material combined with Schedule 40 wall thickness provides excellent pressure-bearing capacity, suitable for medium to high-pressure water systems.
- Cost-Effective: Compared to stainless steel or copper pipes, our galvanized pipes offer a budget-friendly solution without compromising on quality.
- Easy Installation: Smooth surface and uniform dimensions allow for quick welding, threading, or coupling, reducing labor time and costs.
- Versatility: Suitable for both indoor and outdoor applications, including water supply, drainage, gas transmission, and structural frameworks.
- Compliance: Manufactured under strict quality control adhering to ISO9001 and ASTM A53 standards, ensuring consistent batch-to-batch quality.
Our pipes undergo rigorous testing, including hydrostatic pressure tests, tensile strength tests, and coating thickness measurement, to guarantee they meet your specifications. We also offer customized packaging (bundled, plastic wrapped, or in wooden crates) to protect pipes during transit.
Why Choose Hemaokang Steel?
Since our establishment in 2025, Hemaokang Steel (Shandong) Co., Ltd. has quickly grown into a reliable exporter with an annual export value between US$50 million and US$100 million. Our team of 51-100 skilled employees is dedicated to providing top-notch steel products and customer service. We serve markets across North America, South America, Europe, Asia, Africa, and Oceania, and our ISO9001 certification reflects our commitment to quality management. With a strategic location in Liaocheng, Shandong, we have access to efficient logistics networks, ensuring timely delivery worldwide.
We understand that every project is unique, which is why we offer flexible solutions: lengths can be cut to your requirements, end finishes can be customized, and special coatings (e.g., additional epoxy coating) are available on request. Our experienced sales team is ready to assist you with technical advice, quotations, and after-sales support.
Don't settle for substandard pipes. Choose Hemaokang Steel for your water supply projects and experience the difference of quality, reliability, and global expertise. Contact us today for a quote or to discuss your specific needs.
Frequently Asked Questions (FAQ)
Q1: What is the difference between Schedule 40 and Schedule 80 pipes?
A: Schedule 40 has a thinner wall compared to Schedule 80, making it lighter and more cost-effective for general water supply applications. Schedule 80 is thicker and used for higher pressure systems. Our pipes are Schedule 40, suitable for typical water supply needs.
Q2: Can these pipes be used for potable water?
A: Yes, hot-dip galvanized pipes are commonly used for potable water systems. The zinc coating is non-toxic and meets industry standards for drinking water. However, we recommend checking local regulations for specific requirements.
Q3: What lengths do you offer? Can I get custom lengths?
A: Standard length is 6 meters. We can provide custom lengths (e.g., 3m, 4m, 5.8m) upon request. Please specify your requirements when placing an order.
Q4: How is the zinc coating thickness? Is it uniform?
A: Our pipes undergo hot-dip galvanizing, which typically yields a coating thickness of 50-85 microns per ASTM A123 standards. The coating is uniform and adheres firmly to the steel surface, ensuring long-term protection.
Q5: Do you provide samples before bulk order?
A: Yes, we offer free samples (shipping cost may apply) for evaluation. Contact our sales team to arrange sample delivery.
Q6: What is the typical lead time for an order?
A: For standard sizes and quantities, lead time is usually 15-25 days after receiving deposit. Larger orders may require 30-45 days. We always strive to meet your deadlines.
Q7: Are these pipes threaded or plain ended?
A: By default, they are plain ended. Threading, beveling, or coupling can be added as an optional service. Please indicate your preference when ordering.
Q8: What certifications do you have?
A: Our company is ISO9001:2015 certified. Our pipes are manufactured in accordance with ASTM A53 standards. Additional certifications or third-party inspections can be arranged upon request.
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