Q:What is the production process of galvanized square tube?
A:Hot-dip galvanized square tube: It is formed by welding steel plates or steel strips after curling and forming into square tubes, and then placing the square tubes in a hot-dip galvanizing pool through a series of chemical reactions. The production process is relatively simple, with high production efficiency, many varieties and specifications, less equipment and funds required, and it is suitable for small manufacturers to produce. Cold-dip galvanized square tube: The cold-dip galvanizing principle is used on the square tube, and anti-corrosion is mainly carried out through the electrochemical principle. It is necessary to ensure that the zinc powder is in full contact with the steel to generate an electrode potential difference, so the surface treatment of the steel is very important.
Q:What are the performance characteristics of galvanized square tubes?
A:Strong corrosion resistance: The zinc layer can form a dense quaternary crystal, forming a barrier on the surface of the square tube, effectively preventing corrosion factors from penetrating. When zinc is used as sacrificial protection on the cut edge, scratches and plating scratches, an insoluble oxide layer will be formed to play a barrier protection function.
Good mechanical properties: It has certain strength, toughness and impact resistance, and can meet the mechanical requirements of various engineering structures. Among them, the strength of the galvanized square tube made of low alloy steel (such as Q345) is more than 30% higher than that of ordinary carbon steel (such as Q235), and the impact resistance is better.
Beautiful appearance: The zinc layer surface of the cold-dip galvanized square tube is very smooth and dense, with uniform structure; although the surface of the hot-dip galvanized square tube may be slightly rough, it also has a unique metallic texture.
Q:What is the difference between hot-dip galvanized square tube and electro-galvanized square tube?
A:The most common, widely used and corrosion-resistant galvanized square tube on the market refers to hot-dip galvanized square tube. When people say "galvanized square tube" without special instructions, it usually refers to hot-dip galvanized square tube. Electro-galvanized square tube is mainly used in places with high requirements for surface finish, mild corrosion environment or short-term protection.
Q:What are the core advantages of galvanized square tubes?
A:Excellent corrosion resistance: The zinc layer isolates the steel pipe matrix from contact with air and moisture. Even if the zinc layer is scratched, the potential of zinc is lower than that of iron, and it can continue to protect the iron matrix from corrosion through the cathodic protection of the sacrificial anode (zinc). This is the core advantage of galvanized square tubes.
Good strength and toughness: Inherits the characteristics of steel itself.
Lighter weight (compared to solid steel): The hollow structure makes it lighter while obtaining sufficient strength, which is convenient for transportation and installation.
Easy to process and install: It can be processed and assembled by welding (pay attention to ventilation and protection, the galvanized layer will produce harmful fumes at high temperatures), cutting, drilling, bolting, etc.
Long service life: Especially hot-dip galvanized square tubes, which have a long service life in general atmospheric environments, significantly reducing maintenance and replacement costs.
Certain aesthetics: The galvanized layer (especially electro-galvanized) has a certain silver-white metallic luster. High cost-effectiveness: Considering its performance, life and maintenance cost, galvanized square tubes usually have a high cost-effectiveness.
Q:What factors should be considered when choosing galvanized square tubes?
A:1. Use environment: If the environment is highly corrosive (such as coastal areas, chemical plants, and humid environments), hot-dip galvanized square tubes must be selected, and thicker zinc layers or higher grade steel may be required. If the environment is less corrosive and requires aesthetics, electro-galvanized square tubes can be considered.
2. Force requirements: Select appropriate side lengths and wall thicknesses according to load requirements.
3. Budget: Hot-dip galvanizing is more expensive than electro-galvanizing.
4. Appearance requirements: Hot-dip galvanizing has zinc flowers, and electro-galvanizing is smoother.
5. Connection method: Welding should pay attention to the volatilization of the galvanized layer, while bolted connections have less impact.
6. Standards and zinc layer thickness: Clarify the national/industry standards that need to be met and the required zinc layer weight or thickness.