The main production process of galvanized steel sheet
1. Uncoiling and welding
Uncoiling the coils, showing that the strips are needed for continuous operation, electric welding is performed on the tail of the preceding strip and the head of the following strip to ensure the continuous production of the unit.
2. De-oil cleaning
The cleaning section is to clean the surface of the strip to remove rolling oil and zinc powder to obtain good coating adhesion and surface quality. It usually includes spraying, brushing, electrolytic cleaning, brushing, spraying, squeezing and hot air drying. Dry and other facilities, the cleaning section is more important for hot-dip galvanizing, and it is the main process for obtaining good strip steel process performance.
3. Annealing
Carry out recrystallization annealing on the rolled steel strip to obtain excellent product mechanical properties. According to the atmosphere in the furnace, to obtain good strip steel coating performance, the annealing furnace generally consists of preheating, heating, soaking, and cooling. A segment composition.
4. Air knife zinc layer control
According to spraying liquid, usually air or pure nitrogen, to the surface of the strip after the zinc pot is discharged, the thickness of the coating on the surface of the strip is controlled.
5. Refined grain strengthening treatment
The fine-grain strengthening treatment is also the process of heating the strip steel after the tinplate to obtain the zinc-iron alloy coating.
6. Leveling and stretching
Do a good job of rolling strip steel with small rolling force, remove the compromise platform of high-carbon steel, improve strip characteristics, obtain the desired strip roughness, improve strip rigidity and obtain excellent flatness, etc. After leveling, it is tension straightening, which is to carry out tension straightening of the strip steel, and the most important thing is to obtain an excellent plate shape.
7. Post-processing
Passivation or other chemical surface treatments are carried out on strip steel to obtain the corrosion resistance, lubrication or other requirements expected by customers. Usually, spray squeezing or roller drying is used.
8, chamfer
According to the need, the strip is trimmed to obtain the appropriate width accuracy.
9. Oiling
Oiling the strip steel to obtain certain anti-rust and lubricating properties.
The above is the detailed production process of galvanized steel sheet, have you learned it?
