Galvanized square tube is a commonly used structural material in fields such as construction, machinery, and agriculture, and its production process directly affects product quality. Among them, hot-dip galvanized square tubes are favored by the market due to their uniform coating, strong adhesion, and excellent corrosion resistance.
It is understood that the production of hot-dip galvanized square tubes usually adopts two process routes: one is to use hot-rolled or cold-rolled galvanized steel plates and coils as raw materials, and then weld them into hollow square tubes at high frequency after cold bending; The second method is to first make cold-formed hollow steel pipes, then immerse the steel pipes in a hot-dip galvanizing pool for hot-dip galvanizing treatment, and finally obtain square rectangular galvanized pipes.
The core process of hot-dip galvanized square tube lies in the hot-dip galvanizing process: the welded square tube is subjected to pre-treatment such as degreasing, acid washing, plating assistance, and drying, and then immersed in molten zinc solution (temperature about 445-465 ℃), causing a series of physical and chemical reactions between the surface of the steel tube and the zinc solution, forming a dense layer of zinc iron alloy and pure zinc layer. This coating not only physically isolates corrosive media, but also has cathodic protection function, which can prevent the substrate from rusting even if it is locally damaged.
The main characteristics of hot-dip galvanized square tube include:
It is understood that the production of hot-dip galvanized square tubes usually adopts two process routes: one is to use hot-rolled or cold-rolled galvanized steel plates and coils as raw materials, and then weld them into hollow square tubes at high frequency after cold bending; The second method is to first make cold-formed hollow steel pipes, then immerse the steel pipes in a hot-dip galvanizing pool for hot-dip galvanizing treatment, and finally obtain square rectangular galvanized pipes.
The core process of hot-dip galvanized square tube lies in the hot-dip galvanizing process: the welded square tube is subjected to pre-treatment such as degreasing, acid washing, plating assistance, and drying, and then immersed in molten zinc solution (temperature about 445-465 ℃), causing a series of physical and chemical reactions between the surface of the steel tube and the zinc solution, forming a dense layer of zinc iron alloy and pure zinc layer. This coating not only physically isolates corrosive media, but also has cathodic protection function, which can prevent the substrate from rusting even if it is locally damaged.
The main characteristics of hot-dip galvanized square tube include:
☞The production process is relatively simple, the production efficiency is high, and the product specifications are diverse;
☞The threshold for equipment and capital investment is relatively low, suitable for large-scale production, especially welcomed by small and medium-sized galvanized square tube production enterprises;
☞The coating thickness is uniform, the adhesion is strong, and the corrosion resistance life is long.
It should be noted that in terms of strength indicators, hot-dip galvanized welded square pipes are lower than seamless square steel pipes, but they fully meet the requirements in most ordinary structural applications. At present, hot-dip galvanized square tubes are widely used in building frames, guardrails, solar brackets, agricultural greenhouses, vehicle manufacturing and other fields.
☞The threshold for equipment and capital investment is relatively low, suitable for large-scale production, especially welcomed by small and medium-sized galvanized square tube production enterprises;
☞The coating thickness is uniform, the adhesion is strong, and the corrosion resistance life is long.
It should be noted that in terms of strength indicators, hot-dip galvanized welded square pipes are lower than seamless square steel pipes, but they fully meet the requirements in most ordinary structural applications. At present, hot-dip galvanized square tubes are widely used in building frames, guardrails, solar brackets, agricultural greenhouses, vehicle manufacturing and other fields.