Square rectangular pipe is a name for square pipe and rectangular pipe, that is, steel pipes with equal and unequal side lengths. It is made of strip steel by processing and rolling. Generally, the strip is unpacked, flat, crimped, welded to form a round tube, which is then rolled into a square tube and cut to the required length.
After nearly ten years of development, China's rectangular pipe industry has been continuously optimized and improved in product structure, quality level, technical equipment and other aspects, and has become a veritable square pipe manufacturing country in the world, and is moving toward the world's square pipe industrial power.
Square square pipe
The galvanized method of square tube is mainly divided into hot galvanizing and cold galvanizing. Among them, hot-dip galvanizing is a form of galvanizing, when the metal is immersed in a molten zinc bath at a temperature of about 449 ° C (840°F), zinc and the substrate metal surface alloying.
At present, the domestic hot-dip galvanizing product manufacturing industry, mainly including iron and steel enterprises and hot-dip galvanizing processing enterprises two camps, of which, China's hot-dip galvanizing processing enterprises are mainly concentrated in Hebei and the surrounding areas and Jiangsu region.
Square tube
Hot-dip galvanized square pipe, that is, hot-dip galvanized steel pipe, is made of steel plate or steel strip for crimping and forming square pipe, as well as the square pipe formed after hot dip galvanized on the basis of this square pipe, the square pipe production process is relatively simple, high production efficiency, the variety of square pipe is small, the equipment and capital required for square pipe is very low, suitable for the production of small galvanized square pipe manufacturers. But the strength of this steel pipe is much lower than the strength of seamless square pipe.
The cold galvanized square tube is used on the square tube to use the principle of cold galvanized to make the square tube have anti-corrosion performance, the difference between the cold galvanized coating and hot dipping zinc is mainly by the electrochemical principle to carry out anti-corrosion, so it is necessary to ensure that the zinc solution is in full contact with the steel, resulting in electrode potential difference, so the surface treatment of steel is very important.
The square tube after hot dip galvanized treatment has the characteristics of strong toughness, firm combination, strong ductility, durable and so on, as follows:
Performance characteristics of hot dip galvanizing
Under the background of the continuous prominence of the advantages of hot-dip galvanized square pipe, the application field of hot-dip galvanized square pipe continues to expand, and it has been widely used in automotive, photovoltaic, electric power, construction and other scenes. After recent years of development, China's hot-dip galvanized steel pipe technology continues to mature, product quality continues to improve, has become one of the world's main producers of hot-dip galvanized steel pipe.
However, there are more hot-dip galvanized steel pipe enterprises in our country, the market competition is more fierce, and the industry concentration is low. At present, under the background of the increasingly severe development situation of the domestic hot-dip galvanized square pipe industry, in order to break the development dilemma, the future industry needs to continue to promote the integration of enterprise resources, strengthen and expand leading enterprises, and promote the continuous improvement of industry concentration and continuous optimization of structure.