Galvanized square tube is a hollow square section steel tube with a square cross-sectional shape and size made of hot-rolled or cold-rolled galvanized strip steel or galvanized coil as blank, which is formed by cold bending and then high-frequency welding, or a galvanized square tube made by hot-dip galvanizing of a pre-made cold-bent hollow steel tube. Hot-dip galvanized square tubes are divided into seamless and welded ones. Seamless square tubes are formed by extruding
seamless round tubes.
Uses of galvanized square tubes
Since galvanized square tubes are galvanized on square tubes, the application range of galvanized square steel has been greatly expanded compared to square tubes. It is mainly used in curtain walls, buildings, machinery manufacturing, steel construction projects, shipbuilding, solar power generation brackets, steel structure projects, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, etc.
Characteristics of galvanized square steel
Galvanizing has stronger protective effects and strong corrosion resistance. The entire structure is made of zinc, forming a dense quaternary crystal, which forms a barrier on the steel plate, thus effectively preventing corrosion factors from penetrating. The corrosion resistance comes from the strong barrier protection function of zinc. When zinc is used as sacrificial protection on the cut edges, scratches and coating abrasions, zinc forms an insoluble oxide layer to play a barrier protection function
Galvanized square tubes are divided into cold-dip galvanized square tubes and hot-dip galvanized square steels in terms of production process; hot-dip galvanized square steels are square tubes made by welding after curling steel plates or steel strips, and on the basis of this square tube, the square tube is placed in a hot-dip galvanizing pool and formed through a series of chemical reactions. The production process of hot-dip galvanized square tubes is relatively simple, but the production efficiency is very high, and there are many varieties and specifications, but this type of square tube requires very little equipment and funds, and is suitable for the production of small galvanized square tube manufacturers. Cold-dip galvanized square tubes use the principle of cold galvanizing on the square tubes used to make the square tubes have anti-corrosion properties. Unlike hot-dip galvanizing, cold-dip galvanizing coatings mainly use electrochemical principles for corrosion protection. Therefore, 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 demanding.
Hot-dip galvanized square tubes are widely used, mainly in curtain walls, machinery manufacturing, solar power generation brackets, buildings, steel structure projects, etc., especially in curtain walls, machinery manufacturing, and construction. The anti-corrosion effect of cold-dip galvanized square tubes is far different from that of hot-dip galvanized square steels; some merchants in the market use cold-dip galvanized square tubes as hot-dip galvanized square steels to make huge profits; how to distinguish hot-dip galvanized square tubes from cold-dip galvanized square tubes?
The difference between hot-dip galvanized square tubes and cold-dip galvanized square steels is mainly from the following aspects:
1. Look at the appearance: the appearance of hot-dip galvanized squaresteel is slightly rougher than that of cold-dip galvanized square steels; the appearance of cold-dip galvanized square tubes is relatively smooth and bright.
2. Zinc layer thickness: There is a big difference between cold-dip galvanized square steels and hot-dip galvanized square steels in the galvanizing process; the corners of cold-dip galvanized square steels are prone to "electric burning". The color of this part is gray and the zinc layer is thicker. The current dead corner is easy to form in the inner corner to produce an undercurrent area. The zinc layer in this part is thin, and there is no zinc layer attached to the inner wall of the cold-dip galvanized square tube. The cold-dip galvanized square tube has no zinc nodules, agglomerations, etc. as a whole, but the overall zinc layer is thin, and the thickness of the zinc layer on the outer wall is 5μm-10μm. The inner and outer walls of the hot-dip galvanized square tube are attached with zinc layers, there will be water marks and a few zinc nodules, but the overall zinc layer is thicker, and the thickness of the zinc layer on the inner and outer walls of the square tube is more than 70μm.
3. Observe the color: The cold-dip
galvanized square tube is yellowish green, bluish white or slightly colorful at a certain angle to the sun. The hot-dip galvanized square tube is silvery white at a certain angle to the sun.
Under the same circumstances, the price of hot-dip galvanized square tube is higher than that of cold-dip galvanized square tube, so the purchase should be based on the needs.
Baowi-steel offers a variety of galvanized square
steels to meet your needs in various fields such as construction, machinery manufacturing, and steel structure engineering. Whether you need hot-dip galvanized square tubes with strong corrosion resistance or cold-dip galvanized square
steels that are cost-sensitive, we can provide you with the best solution. Choosing Baowi-steel, you can not only get high-quality galvanized square tubes, but also enjoy professional customer service and technical support. We are committed to providing each customer with customized products and solutions to help you achieve the best results in your project.