Large Diameter Galvanized Pipe/square Steel Seamless

Large Diameter Galvanized Pipes (typically outer diameter ≥ 200mm) and Large Diameter Seamless Square Steels (usually side length ≥ 100mm, seamless-structured) combine the advantages of "large-size load-bearing capacity," "galvanized anti-corrosion," and "seamless structural stability." Their core features are categorized and detailed below:

I. Features of Large Diameter Galvanized Pipe

1. Superior Corrosion Resistance for Large-Scale Pipelines

• Adopts hot-dip galvanization technology, forming a thick dual-layer coating (zinc-iron alloy layer + pure zinc layer) with a thickness of ≥85μm. This coating fully covers the inner and outer walls of the large-diameter pipe, including welds and joints, effectively isolating corrosive media (e.g., groundwater, industrial wastewater, atmospheric moisture) and preventing rusting.

• In harsh environments (e.g., coastal salt-spray areas, industrial zones with chemical fumes), the service life can reach 30–50 years—5–8 times longer than ungalvanized large-diameter pipes, reducing the frequency of pipeline replacement in large-scale projects (e.g., municipal water supply networks).

2. High Pressure-Bearing Capacity & Structural Stability

• The base pipe is made of high-strength carbon steel (e.g., Q235B, Q345B) or low-alloy steel, with a thickened wall (wall thickness 6mm–20mm, depending on diameter). For example, a DN300 (outer diameter 323.9mm) galvanized pipe can withstand a working pressure of 1.6–4.0MPa, meeting the pressure requirements of large-scale water supply, drainage, or gas transmission systems.

• The seamless or high-quality welded base pipe (e.g., ERW, SAW) eliminates structural weak points. After galvanization, the pipe maintains uniform mechanical properties, avoiding deformation or leakage under high pressure or external soil pressure (critical for buried large-diameter pipelines).

3. Large Flow Capacity & Low Transmission Resistance

• With a large inner diameter (e.g., DN200 pipe has an inner diameter of ~190mm; DN600 pipe has an inner diameter of ~580mm), it enables high-volume fluid transmission (water, gas, or industrial media) with low flow resistance. This is essential for municipal projects like urban water supply trunk lines or industrial cooling water pipelines, where large flow rates are required.

• The galvanized inner wall is smooth (surface roughness Ra ≤ 12.5μm), minimizing sediment accumulation and scaling. This ensures stable flow rates over long-term use and reduces maintenance costs for pipeline cleaning.

Structural engineering (buildings, bridges, towers)

Machinery manufacturing

Steel frameworks and fabrication

Transportation equipment

Furniture and architectural projects

Fencing, gates, and support columns