Galvanized Square Pipe
Galvanized Square Pipemanufacturer boasts fully automated galvanizing production lines and square tube forming equipment, ensuring stable production capacity and ample stock. Customization of non-standard specifications is supported, and one-stop services including cutting, punching, bending, and length processing are provided. As a leading galvanized steel pipe supplier in China, we strictly control the zinc coating, wall thickness, and dimensional accuracy. We possess the capability for large-scale project supply, with nationwide logistics coverage and outstanding comprehensive production and supporting capabilities.
A Galvanized Square Pipe refers to a steel product manufactured using carbon steel or low-alloy steel as a base material; it is formed into a square cross-section through cold bending or welding processes, and subsequently undergoes either hot-dip galvanizing or electro-galvanizing surface treatment.
The primary function of the galvanized coating is to form a dense, protective zinc film, thereby effectively preventing the steel from oxidizing and rusting when exposed to humid, rainy, or corrosive environments, and significantly enhancing both its corrosion resistance and service life.
Key Features
High Corrosion Resistance: The zinc coating provides cathodic protection, thereby retarding the corrosion of the steel substrate.
High Structural Strength: Possesses excellent load-bearing capacity and compressive strength.
Smooth and Aesthetic Surface: Suitable for applications serving both structural and decorative purposes.
Good Processing Performance: Capable of undergoing secondary processing operations such as cutting, welding, and drilling.
Hot-dip galvanizing vs cold-dip galvanizing
the difference in corrosion resistance is not slight, but 5 to 10 times!
1. Difference in Zinc Layer Thickness:
Hot-dip galvanizing: 55–120 μm (National standard ≥55μm, commonly used in engineering ≥70μm)
Cold galvanizing: 5–20 μm (Conventionally only 8–12μm)
→ Hot-dip galvanized zinc layer = 5–10 times that of cold-dip galvanizing
2. Difference in Bonding Method:
Hot-dip galvanizing: Metallurgical bonding, zinc-iron alloy layer, corrosion protection is achieved through the substrate itself.
Cold galvanizing: Physical adsorption, just a thin electroplated film, easily peeled off upon impact, and a starting point for rust.
3. Difference in Rust Prevention Principle:
Hot-dip galvanizing: Shielding protection + sacrificial anode protection, even at cracks, rust will not occur.
Cold galvanizing: Only shielding protection, rust will spread from the inside once a crack occurs.
In short, cold-dip galvanized square Pipes are only suitable for temporary indoor/decorative use; hot-dip galvanized square tubes are only suitable for outdoor use, engineering projects, and important structures.
Hot-dip galvanized square Pipe vs cold-dip galvanized square Pipe National Standard Comparison Table
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Comparison Items |
Hot-dip galvanized square Pipe |
Cold-galvanized square Pipes |
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Substrate Compliance with National Standards |
GB/T 6728-2017/2025 "Cold-formed hollow steel for structural use" |
GB/T 6728-2017/2025 "Cold-formed hollow steel sections for structural use" |
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Zinc Coating National Standards |
GB/T 13912-2020 "Technical requirements for hot-dip galvanized coating of steel" |
GB/T 9799-2011 "Zinc electroplating of steel" |
|
Zinc Coating Thickness |
55～85μm and above, ≥70μm commonly used in engineering |
5～20μm, typically only around 10μm |
|
Zinc Coating Adhesion |
Metallurgical bond, strong adhesion, not easy to peel off |
Physical adhesion, easily chipped by impacts |
|
Surface Condition |
Zinc spangles may be present, flatness is average |
Smooth and delicate, no zinc spots, good appearance |
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Applicable Scenarios |
Outdoor, municipal, building structures, photovoltaic brackets, guardrails, factory components |
Indoor decoration, light-duty supports, furniture frames, non-load-bearing components |
|
Unapplicable Scenarios |
No strict contraindications, can be used in most working conditions |
Strictly prohibited for outdoor use, in damp, corrosive environments, or on load-bearing main structures |
|
Service Life |
15～30 years |
3～8 years (indoors) |
Hot Tags: Galvanized Square Pipe Supplier, Galvanized Steel Pipe Manufacturer, Low Price Galvanized Square Tube
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Hanyu Jingu, High-tech Zone, Jinan City, Shandong Province, China
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