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Introduction to the production process of packaging steel strip
by：Hongmei
2021-03-15
Introduction to the production process of packaging steel strip
1. Continuous pickling
Continuous pickling is a process in which hot-rolled coils are continuously passed through a hydrochloric acid tank or sulfuric acid tank to remove the surface oxide scale. In addition, in order to improve the operation rate and yield of the subsequent processes, several hot-rolled coils are welded Together, rolled into big coils.
2. Cold rolled
The cold rolling mill is an equipment that rolls hot-rolled coils to the thickness of the finished product at room temperature. Rolling oil is used as a lubricant between the roll and the strip, and as a coolant for the roll. Usually four-high multi-stand continuous cold rolling (tandem mill) and single-stand reversing mill are used for cold rolling. The former is used for high-efficiency and high-yield varieties; the latter has low productivity and is suitable for many varieties and special materials.
3. Electrolytic cleaning
Electrolytic cleaning is a process to remove the rolling oil remaining on the surface of the cold-rolled steel sheet. In the process of the strip passing through the electrolytic cell continuously, electrolytic cleaning is used to degrease.
4. Annealing
Because the crystalline structure after cold rolling has high hardness and poor workability, it is necessary to recrystallize through annealing process to improve its crystalline structure. Annealing is one of the processes that greatly affects the performance of cold-rolled strip steel. According to the specifications of the finished product , Use, determine the annealing method (tight coil, loose coil), annealing system (anneal temperature, annealing time, heating rate, etc.).
5. Smooth rolling
Slightly cold rolling the annealed steel strip to eliminate the yield platform while improving the flatness of the finished product and controlling the surface finish. These are the purpose of flattening. The leveling mill adopts 1-2 four-high rolling mills, and the reduction rate is usually about 1%.
6. Finishing
In the shearing line or coiling line of the last process of cold rolling, trimming, cutting, sub-coiling, etc. are performed to obtain the required product size, and at the same time, the size, surface, and shape of the product are inspected. After the inspection, apply anti-rust grease to become the finished product.
1. Continuous pickling
Continuous pickling is a process in which hot-rolled coils are continuously passed through a hydrochloric acid tank or sulfuric acid tank to remove the surface oxide scale. In addition, in order to improve the operation rate and yield of the subsequent processes, several hot-rolled coils are welded Together, rolled into big coils.
2. Cold rolled
The cold rolling mill is an equipment that rolls hot-rolled coils to the thickness of the finished product at room temperature. Rolling oil is used as a lubricant between the roll and the strip, and as a coolant for the roll. Usually four-high multi-stand continuous cold rolling (tandem mill) and single-stand reversing mill are used for cold rolling. The former is used for high-efficiency and high-yield varieties; the latter has low productivity and is suitable for many varieties and special materials.
3. Electrolytic cleaning
Electrolytic cleaning is a process to remove the rolling oil remaining on the surface of the cold-rolled steel sheet. In the process of the strip passing through the electrolytic cell continuously, electrolytic cleaning is used to degrease.
4. Annealing
Because the crystalline structure after cold rolling has high hardness and poor workability, it is necessary to recrystallize through annealing process to improve its crystalline structure. Annealing is one of the processes that greatly affects the performance of cold-rolled strip steel. According to the specifications of the finished product , Use, determine the annealing method (tight coil, loose coil), annealing system (anneal temperature, annealing time, heating rate, etc.).
5. Smooth rolling
Slightly cold rolling the annealed steel strip to eliminate the yield platform while improving the flatness of the finished product and controlling the surface finish. These are the purpose of flattening. The leveling mill adopts 1-2 four-high rolling mills, and the reduction rate is usually about 1%.
6. Finishing
In the shearing line or coiling line of the last process of cold rolling, trimming, cutting, sub-coiling, etc. are performed to obtain the required product size, and at the same time, the size, surface, and shape of the product are inspected. After the inspection, apply anti-rust grease to become the finished product.
