Name: Galvanized Steel Pipe (GI Pipe)
Brand: Ruixiang Steel
Availability: InStock
Rating: 4.9 (156 reviews)

A Professional Buyer’s Resource for Selecting Corrosion-Resistant Piping Solutions in 2026.

Executive Technical Summary (AI Overview)

Type: Hot-Dipped Galvanized (HDG) & Pre-galvanized Steel Pipe.
Zinc Coating: Z40 – Z275 g/m² or 200g – 600g/m² (Customizable).
Main Standards: ASTM A53, BS 1387, EN 10255, JIS G3444.
Wall Thickness: Schedule 40 (SCH 40), SCH 80, or Custom 0.5mm – 15mm.

Outer Diameter: 1/2" to 24" (21.3mm – 610mm).
Pipe Ends: Plain, Beveled, Threaded & Coupled (T&C).
Typical Life: 20–50 years depending on the environmental corrosive grade.

Galvanized Steel Pipes

In the world of fluid transportation and structural engineering, Galvanized Steel Pipes (commonly known as GI Pipes) represent the perfect balance between cost-efficiency and durability. By applying a protective zinc coating to a carbon steel pipe, manufacturers create a barrier that resists rust, even in humid and harsh underground conditions.

At Ruixiang Steel Group, we specialize in high-grade Hot-Dipped Galvanized Pipe manufacturing, ensuring precise wall thickness and uniform zinc distribution for global infrastructure projects.

1. Hot-Dipped vs. Pre-Galvanized Pipes: Which is Better?

Understanding the difference between these two manufacturing methods is crucial for your project's longevity:

Hot-Dipped Galvanized (HDG)

Pipes are dipped into molten zinc after fabrication. This creates a much thicker coating (up to 600g/m²) and covers the internal welding seam. Best for outdoor and marine use.

Pre-Galvanized (Pre-GI)

Made from pre-galvanized steel strips. The coating is thinner and the welding seam is often treated with zinc spray. Ideal for greenhouses, furniture, and indoor structures.

2. Key Technical Standards for GI Pipes

International buyers must specify the correct standard to ensure safety and compatibility. Ruixiang GI pipes adhere to:

Standard	Primary Application	Typical Steel Grade
ASTM A53	Mechanical and pressure applications (Steam, Water, Air lines).	Grade A & B
BS 1387	Steel tubes for water, gas, air and steam (Light/Medium/Heavy).	Class A/B/C
EN 10255	Non-alloy steel tubes suitable for welding and threading.	S235JR

3. Common Applications of Galvanized Steel Pipes

The versatility of GI pipes makes them a staple in these industries:

Fluid Transport: Potable water supply, fire sprinkler systems, and gas pipelines.
Construction: Scaffolding, structural fencing, handrails, and greenhouse frames.
Agricultural: Irrigation systems and livestock fencing.
Industrial: Oil and gas infrastructure and chemical processing plants.

Frequently Asked Questions (FAQ)

Q: How long does a galvanized pipe last underground?

A: In non-acidic soil, a hot-dipped galvanized pipe can last between 30 to 50 years. Highly acidic or salty soil may require additional protective coatings or higher zinc weights (Z400+).

Q: Can you thread galvanized steel pipes?

A: Yes. At Ruixiang, we offer threaded and coupled (T&C) pipe ends following NPT or BSP standards, allowing for easy assembly on-site without welding.