What is the difference between hot and cold galvanized square tube galvanized square tube

Galvanized square tube can be said that everyone is not very understanding, galvanized square tube is widely used, they are mainly used in the following aspects, small curtain walls, buildings, machinery manufacturing, steel pipe construction projects, large solar power stents , and power engineering, power plants, and agriculture and chemical machinery. Can be described as a wide variety, all areas involved. Galvanized square tube divided into hot and cold galvanized square tube, then the difference between hot and cold galvanized square tube where?

What is galvanized square pipe?

The galvanized square tube is a hollow square cross-section type steel tube with a square cross-section shape formed by hot-rolling or cold-rolled galvanized steel strip or galvanized coil sheet after cold-twist forming and then high frequency welding; Through the multiple chemical reactions of the hot-dip galvanizing data, hot-dip galvanized square pipes that are now widely used can be processed. Or, the pre-made cold-formed hollow steel pipe can be processed by hot dip galvanizing to form a galvanized square tube galvanized square tube standard square tube. The function of the hot-dip galvanized square tube is that other materials are not available and comparable, such as its plasticity, toughness, strength, etc. are very superior, and after welding is also very strong, can be processed and produced in various environments. As the primary steel, steel pipes are widely used in our daily life. Petroleum and natural gas transportation, production of architectural structure grids, and production of roads and bridges, etc., can be said to not only reduce the weight of steel brackets, save construction materials, but also make construction easier.

Galvanized square tube classification

Galvanized square pipes are divided into hot-dip galvanized square pipes and cold galvanized square pipes from the production process. It is precisely because of the difference in the addition of these two galvanized square tubes that they have created many different physical and chemical properties. In general, they have many differences in strength, toughness and mechanical properties.

1, hot dip galvanized square tube

Hot-dip galvanized square tube: It is a square tube welded by using a steel plate or a steel strip after crimped and formed, and on the basis of the square tube, the square tube is placed in a hot dip galvanizing bath after a series of chemical reactions. A square tube formed. The production process of hot-dip galvanized square pipes is relatively simple, and the production efficiency is very high. There are many varieties and specifications. The equipment and funds required by this square pipe are few, which is suitable for the production of small galvanized square pipe manufacturers. However, in terms of strength, the strength of the steel pipe is much lower than that of the seamless square pipe.

2, cold galvanized square tube

The cold galvanizing square tube is based on the use of cold galvanizing on the square tube to make the square tube have anti-corrosion properties. Different cold galvanized coatings with hot-dip galvanizing mainly use electrochemical principles to carry out corrosion protection. Therefore, it is necessary to ensure sufficient contact between zinc powder and steel materials, resulting in a difference in electrode potential. Therefore, the surface treatment of steel materials is very important.

Galvanized square tube uses and characteristics

First, use

As the galvanized square tube is galvanized on the square tube, the scope of application of the galvanized square tube has been greatly expanded compared with the square tube. It is mainly used for curtain wall, construction, machinery manufacturing, iron and steel construction projects, shipbuilding, solar power support, steel structure engineering, power engineering, power plants, agriculture and chemical machinery, glass curtain walls, car chassis, airports and so on.

Second, characteristics

Galvanizing has stronger protection and corrosion resistance. The entire structure consists of zinc, forming a dense quaternary crystal, which forms a barrier on the steel plate, thus effectively preventing penetration of corrosion factors. Corrosion resistance The barrier layer from zinc has a strong protective function. When zinc is sacrificially protected by trimming, scratches, and scratches on the plated layer, zinc forms an insoluble oxide layer and functions as a barrier.

The difference between hot and cold galvanized square tube

Galvanized square tube has two categories: hot-dip galvanized square tube and electro-galvanized square tube. Hot-dip galvanized square tube has wet method, dry method, lead-zinc method, redox method and so on. The main difference between different hot-dip galvanizing methods is how to activate the surface of the pipe to improve galvanizing quality after the pickling of steel pipes. The main production methods are dry method and redox method. The characteristics are shown in the table. Zinc electroplated zinc surface is very smooth and dense, uniform structure; has good mechanical properties and corrosion resistance; zinc consumption is 60% to 75% lower than hot-dip galvanizing. Zinc electroplating has certain technical complexity, but this method must be used for single-sided plating, double-sided plating with different coating thickness on the inner and outer surfaces, and thin-walled tube galvanizing.