The galvanized square tube is a hollow square section steel tube with a square cross-section shape made of hot-rolled or cold-rolled galvanized strip steel or galvanized coil blanks after the cold bending forming and then high-frequency welding Because 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. Let's take a look at the classification of galvanized square pipes and the galvanized square management weight specifications.
Classification of galvanized square tube
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.
3, hot and cold galvanizing difference
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.
Galvanized square management weight specifications
Galvanized square tube calculation method
Galvanized square tube calculated per meter theoretical weight.
4*(side length-thickness)*0.00785*1.06*thickness.
Among them, the length of the sides and the thickness of the wall are in millimeters. Substituting the values ​​directly into the above formula yields the weight per square meter, in kilograms.
For example, a 30 x 30 x 2.5 mm square tube, according to the above formula, can calculate its weight per meter as: 4 x 2.5 x (30-2.5) x 7.85 = 275 x 7.85 = 2157.75 grams, which is about 2.16 kilograms.
When wall thickness and side length are all in millimeters, 4 x wall thickness x (side length - wall thickness) calculates the volume of the square tube per meter length, in cubic centimeters, multiplied by the proportion of iron per cubic meter. A centimeter of 7.85 grams is the weight in kilograms per square meter.
Summary: The relevant information on the classification of galvanized square pipes and the galvanizing side management theory weight specification table was introduced here. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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