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Welcome to Anping County Boli Hardware Wiremesh Products Factory, a trusted manufacturer established in 1998 with over two decades of expertise in metal fabrication. Our Hot Dipped Galvanized Steel Pipe GI Hollow Round Zinc Coated Perforated Tubes are engineered to meet the rigorous demands of industrial engineering and construction projects worldwide. Combining superior corrosion resistance, structural integrity, and versatile perforation patterns, these tubes offer a reliable solution for applications ranging from handrails and fencing to scaffolding and fluid distribution systems. With an annual export value of US$5-10 million and shipments to over 15 global markets, we ensure consistent quality and timely delivery from our ports in Tianjin, Qingdao, Shanghai, and Foshan.
Our perforated galvanized tubes undergo a meticulous manufacturing process: hot-dipped galvanizing provides a thick, uniform zinc coating that protects against rust and harsh environments, while the perforations are precisely punched to suit your specific functional needs. The hollow round design offers an excellent strength-to-weight ratio, making them easy to handle, cut, and install. Whether you require standard sizes or custom dimensions, our factory-direct production ensures cost-effectiveness and flexibility.
Key Features & Technical Specifications
- Hot Dipped Galvanized Coating: Minimum 275 g/m² zinc coating weight (ASTM A123), providing outstanding corrosion protection for outdoor and industrial use.
- Precision Perforations: Round holes in staggered or linear patterns, diameters from 2mm to 20mm, customizable pitch and open area ratio.
- High Strength: Made from premium mild steel (Q195/Q235) with yield strength ≥ 235 MPa, suitable for load-bearing structures.
- Versatile Sizes: Outer diameter from 21.3mm to 219.1mm, wall thickness from 0.5mm to 4mm, length from 1m to 12m (or as requested).
- Smooth Surface: No sharp edges or burrs after perforation and galvanizing, ensuring safe handling.
- Easy Weldability: Compatible with standard welding techniques for on-site modifications.
| Parameter | Standard Options | Customizable |
|---|---|---|
| Outer Diameter | 1/2" (21.3mm), 3/4" (26.7mm), 1" (33.4mm), 2" (60.3mm), 4" (114.3mm), 6" (168.3mm), 8" (219.1mm) | Yes |
| Wall Thickness | 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm | Yes |
| Length | 1m, 2m, 3m, 4m, 6m, 12m | Yes |
| Hole Diameter | 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 15mm, 20mm | Yes |
| Zinc Coating Weight | 275 g/m² (standard), 350 g/m² (heavy-duty) | Yes |
Benefits for Your Projects: These tubes are ideal for industrial engineering applications such as machine guards, conveyor systems, ventilation ducts, and structural supports. In construction, they are widely used for handrails, fences, scaffolding, and drainage pipes. The perforated design allows for easy ventilation, fluid flow, or cable management. The hot-dipped galvanized finish ensures a maintenance-free service life of 20–30 years in normal environments, reducing long-term costs.
Backed by our factory's 26 years of manufacturing experience, each batch undergoes strict quality control: visual inspection, dimensional checks, and coating thickness testing. We have served clients in North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East, consistently meeting their specific requirements. Our production capacity exceeds 5,000 tons annually, ensuring stable supply for large-scale projects.
Trust Anping Boli for your next project. With our professional team, competitive pricing, and flexible customization, we are your reliable partner for galvanized steel solutions. Contact us today for a quote or sample testing. We look forward to supporting your industrial engineering and construction needs with high-quality perforated tubes.
Frequently Asked Questions
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What is the difference between hot-dipped galvanized and pre-galvanized?
Hot-dipped galvanizing immerses the pipe in molten zinc, creating a thicker, more durable coating (typically 275–600 g/m²) suitable for outdoor and corrosive environments. Pre-galvanized (electro-galvanized) has a thinner layer and is less corrosion-resistant. -
Can you provide custom perforation patterns?
Yes, we can customize hole diameter, pitch, spacing, and pattern (staggered, linear, or custom) according to your drawings or samples. Minimum order quantity may apply. -
What standards do your pipes comply with?
Our pipes are manufactured to meet ASTM A53, BS 1387, EN 10255, GB/T 3091, and other international standards. Please specify your required standard at the time of inquiry. -
How do you ensure the zinc coating quality?
We perform strict testing including coating thickness measurement (using magnetic thickness gauge), uniformity test (Preece test), and visual inspection. Our coating weight meets or exceeds the minimum requirement of 275 g/m². -
What is the typical lead time?
For standard sizes, lead time is 15–20 days after deposit. Custom orders may require 25–30 days depending on complexity. We offer express shipping options for urgent projects. -
Do you offer free samples?
Yes, we provide free samples for existing stock sizes. The buyer is responsible for shipping costs. Custom samples are available at a nominal fee which is refundable upon bulk order. -
Can these tubes be used for structural applications?
Yes, our hot-dipped galvanized steel pipes have sufficient strength (yield strength ≥ 235 MPa) for use in handrails, scaffolding, frames, and light structural supports. For heavy load-bearing structures, please consult our engineers for proper thickness and diameter selection. -
What is your packaging to protect the pipes during transit?
We bundle pipes with steel straps, wrap them in waterproof plastic, and add corner protectors. For perforated tubes, we use protective caps on ends. Standard export seaworthy packaging is used for all shipments.
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