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Help CenterHot Dipped Galvanized Hollow Section 40x40mm 3.0mm Q345 Steel Pipe
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As a trusted manufacturer from Hemaokang Steel (Shandong) Co., Ltd., we are proud to offer our premium Hot Dipped Galvanized Hollow Section 40x40mm 3.0mm Q345 Steel Pipe. This product is engineered to deliver exceptional corrosion resistance, structural integrity, and long service life—making it a reliable choice for demanding construction and infrastructure projects. With our ISO 9001 certified production processes and annual export value exceeding US$50 million, we ensure every pipe meets rigorous quality standards. Choose our galvanized hollow section to optimize your project’s performance and cost-effectiveness.
Our Q345 steel hollow section undergoes a hot-dipped galvanizing process that forms a thick, uniform zinc coating, providing superior protection against rust and environmental wear. The 40x40mm square profile combined with a 3.0mm wall thickness offers excellent load-bearing capacity while maintaining a lightweight structure for easy handling and installation. Ideal for use in building frames, handrails, solar panel supports, machinery structures, and more, this product is a versatile solution for both indoor and outdoor applications.
Key Features & Technical Specifications
- Material Grade: Q345 low-alloy high-strength steel, offering excellent weldability and toughness.
- Galvanizing Standard: Hot-dipped galvanized coating with average thickness ≥ 85 μm per ASTM A123, ensuring long-term corrosion resistance.
- Dimensional Accuracy: Side length tolerance ±0.5mm, wall thickness tolerance ±0.2mm, guaranteeing consistent fit and performance.
- Length Options: Standard 6m, with custom lengths available upon request (up to 12m).
- Surface Finish: Smooth, free from spangles, with uniform zinc coverage.
- Applications: Structural framing, architectural cladding, agricultural equipment, transportation infrastructure, and industrial racks.
- Packaging: Bundled with steel straps or in wooden crates for safe transport.
| Parameter | Value |
| Side Length | 40mm x 40mm |
| Wall Thickness | 3.0mm |
| Weight per Meter | ~3.35 kg/m (approx.) |
| Yield Strength (Min) | 345 MPa |
| Tensile Strength | 470–630 MPa |
| Zinc Coating Weight | ≥ 600 g/m² (both sides) |
| Length | 6m (standard), customizable |
Product Advantages & Customer Benefits
- Exceptional Corrosion Protection: The hot-dipped galvanized layer acts as a sacrificial barrier, protecting the steel substrate even if scratched. This extends the service life of your structure by 20–50 years in moderate environments, reducing maintenance costs.
- High Strength-to-Weight Ratio: Q345 steel provides higher strength than standard carbon steel (Q235), allowing you to use thinner sections without compromising load capacity. This saves material and reduces overall project weight.
- Excellent Weldability: Q345 is designed for welding; our galvanized sections can be welded with proper preparation (grinding off zinc coating near weld area). This enables easy integration into complex structures.
- Uniform Dimensions: Precise manufacturing ensures consistent squareness and straightness, simplifying assembly and alignment on site.
- Versatile Applications: Suitable for indoor and outdoor use, including corrosive environments like coastal areas, industrial plants, and agricultural settings.
- Eco-Friendly: Galvanized steel is 100% recyclable, and the hot-dip process has a low environmental impact compared to other coating methods.
- Cost-Efficient: Lower lifetime cost due to reduced maintenance, longer lifespan, and competitive pricing from our direct factory supply.
Trust & Reliability – Why Choose Hemaokang Steel?
Since our establishment in 2025, Hemaokang Steel (Shandong) Co., Ltd. has rapidly grown into a leading exporter of steel products, with an annual export value of US$50 million to US$100 million. Our dedicated team of 51–100 employees operates from our manufacturing base in Liaocheng, Shandong, China—a renowned steel production hub. We serve clients across North America, South America, Europe, Asia, Africa, Oceania, and the Middle East, demonstrating our global reach and commitment to quality.
We are proud to hold ISO 9001 certification, which ensures that every pipe we produce undergoes rigorous quality control from raw material selection to final packaging. Our hot-dipped galvanized hollow sections are tested for coating thickness, tensile strength, and dimensional accuracy before shipment. With a strong focus on customer satisfaction, we offer flexible order quantities (MOQ as low as 5 tons), timely delivery (typically 15–25 days), and professional after-sales support. Contact us today to request a quotation or sample—your reliable partner for premium steel solutions.
Frequently Asked Questions (FAQ)
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Q: What is the difference between hot-dipped galvanized and pre-galvanized hollow sections?
A: Hot-dipped galvanizing (HDG) involves immersing the steel in molten zinc, creating a thicker, more durable coating (≥85 μm) that provides superior corrosion resistance. Pre-galvanized (or electro-galvanized) sections have a thinner coating and are more suitable for dry indoor applications. Our HDG pipes are ideal for outdoor or harsh environments. -
Q: Can I weld this galvanized pipe?
A: Yes, but welding galvanized steel requires precautions. The zinc coating should be ground off at least 2–3 inches from the weld area to avoid toxic fumes and to ensure proper weld penetration. After welding, the area can be re-galvanized with cold galvanizing spray or touch-up paint. We recommend following standard welding safety practices. -
Q: What is the maximum length I can order?
A: Standard length is 6 meters. Custom lengths up to 12 meters are available upon request, subject to transportation and handling constraints. Please contact us to discuss your specific requirements. -
Q: Do you provide a mill test certificate or material test report?
A: Yes, we can provide a mill test certificate (MTC) for each batch, confirming chemical composition, mechanical properties, and coating thickness. This is available upon request. -
Q: What is the minimum order quantity (MOQ)?
A: Our MOQ for this product is typically 5 tons (about 150 sticks of 6m length). For smaller quantities, please contact our sales team to discuss feasibility. -
Q: How long does the galvanized coating last?
A: In normal atmospheric conditions (rural and urban), the coating can last 20–30 years before initial maintenance. In industrial or coastal environments, the lifespan may be 15–25 years. The actual service life depends on local environmental factors. -
Q: What is the load capacity of a 40x40x3.0mm hollow section?
A: The exact load capacity depends on span, support conditions, and load type. As a rough guide, a 3m long simply supported beam can carry a uniformly distributed load of approximately 2.5 kN (255 kg) with a safety factor of 1.5. For detailed structural calculations, please consult your engineer or request our technical data sheet. -
Q: Can I get a sample before placing a bulk order?
A: Absolutely. We offer sample pieces (typically 500mm length) for quality evaluation. The sample is free, but you will need to cover the shipping cost. Contact us to arrange a sample.
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