CN-117701865-B - Method for stopping and starting continuous strip steel with thickness not greater than 0.5mm

Abstract

The invention discloses a method for stopping and starting continuous strip of thin strip steel with the thickness not more than 0.5mm, which comprises the following steps of S1, adjusting coiling tension of each section in a furnace, S2, improving the coiling tension, reducing the production line speed and the annealing temperature, S3, adjusting the rotating speed of a cooling fan, S4, closing a burner, and reducing the opening degree of the cooling fan, and S5, stopping and processing.

Inventors

• HU DI
• YU LIN
• JIANG HUAN
• WU XIAOFENG
• SONG WEI
• Kan Haibao
• WANG ANQUAN
• REN TAO

Assignees

• 马钢(合肥)钢铁有限责任公司

Dates

Publication Date

20260505

Application Date

20231130

Claims (3)

1. 1. A method for stopping and starting continuous strip steel with the thickness not more than 0.5mm is characterized by comprising the following steps of S1, adjusting coiling tension of each section in a furnace, S2, improving the coiling tension, reducing the production line speed and reducing the annealing temperature; S3, adjusting the rotating speed of a cooling fan, S4, closing a burner, reducing the opening degree of the cooling fan, S5, stopping the process, wherein in the step S1, the coiling tension of an inlet compensating roller of an annealing furnace is adjusted to be 1.8-2.5KN, the coiling tension of a heating section is adjusted to be 2.5-3.0KN, the coiling tension of a soaking section is adjusted to be 2.0-2.5KN, the coiling tension of a slow cooling section and a fast cooling section is adjusted to be 3.0-3.5KN, the coiling tension of a final cooling section is adjusted to be 4.0-4.2KN, the coiling tension of an outlet compensating roller of the annealing furnace is adjusted to be 3.8-4.2KN, in the step S2, the coiling tension of each section is increased by 15-20%, the production line speed is reduced from 200-250m/min to 120-150m/min, the annealing temperature is reduced to 600-650 ℃, in the step S2, the coiling tension of the slow cooling section and the fast cooling section is reduced to be 3.0-3.5 percent, the rolling tension of the cooling section is reduced to be 3.8-4.2, and the cooling section is stopped after the step is stopped, and the step S2 is stopped, and the step is reduced to be 3.5 percent, and the cooling section is stopped, and the step is reduced to be stable, and the rolling tension of the cooling section is reduced to be 5.
2. 2. A method for stopping and starting up a strip of thin strip steel having a thickness of not more than 0.5mm as claimed in claim 1, wherein said step S5 comprises stopping and lowering the temperature, cooling by the combustion air of the annealing furnace, and slowly withdrawing the strip steel from the furnace.
3. 3. The method for stopping and starting up a continuous strip steel according to claim 1 or 2, wherein in the step S5, when the thickness of the strip steel is not more than 0.4mm, the strip steel is stopped and cooled to 400 ℃.

Description

Method for stopping and starting continuous strip steel with thickness not greater than 0.5mm Technical Field The invention belongs to the technical field of cold-rolled strip steel, and particularly relates to a method for stopping and starting continuous strip steel with the thickness not more than 0.5 mm. Background At present, in the annealing production process of cold-rolled strip steel, the thin strip steel with the thickness less than or equal to 0.5mm has faults or other problems on a production line, so that the strip steel can be seriously buckled, the strip breakage in a furnace can occur in the restarting process, the production line is stopped and restarted, products are scrapped after the strip steel breakage, the production line is stopped and opened, and the strip is manually connected, so that the cost of each strip breakage starting is extremely high, not only is extremely high in production cost loss, but also the products are difficult to deliver in time. The invention patent with the publication number of CN104438320B discloses a rolling method of ultrathin strip steel of a Senkymi rolling mill on the 8 th month 22 th 2017, which comprises the following steps of raw material specification design, definition of raw material thickness, width and width allowance, cold rolling load distribution, determination of rolling mill passes and load distribution thereof, roll shape design, setting of roll shape curves of a middle roll and two middle rolls respectively, coiling tension distribution, determination of unit coiling tension value of each pass, plate shape control and design of target plate shape control curve of each pass. The method cannot avoid the breakage of the thin strip steel and cannot reduce the cost loss. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a method for stopping and starting continuous strip of thin strip steel, which can reduce buckling and deviation risks of the thin strip steel, avoid strip breakage of the strip steel and reduce cost loss, wherein the thickness of the thin strip steel is not more than 0.5 mm. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The method for stopping and starting the continuous strip steel with the thickness not greater than 0.5mm comprises the following steps of S1, adjusting coiling tension of each section in a furnace, S2, improving the coiling tension, reducing the production line speed and the annealing temperature, S3, adjusting the rotating speed of a cooling fan, S4, closing a burner, reducing the opening degree of the cooling fan, and S5, stopping the machine. In the step S1, the coiling tension of the compensating roller at the inlet of the annealing furnace is regulated to be 1.8-2.5KN, the coiling tension of the heating section is regulated to be 2.5-3.0KN, the coiling tension of the soaking section is regulated to be 2.0-2.5KN, the coiling tension of the slow cooling section and the fast cooling section is regulated to be 3.0-3.5KN, the coiling tension of the aging section is regulated to be 3.0-3.5KN, the coiling tension of the final cooling section is regulated to be 4.0-4.2KN, and the coiling tension of the compensating roller at the outlet of the annealing furnace is regulated to be 3.8-4.2KN. The step S2 comprises the steps of increasing the coiling tension of each section by 15-20%, reducing the production line speed from 200-250m/min to 120-150m/min, and reducing the annealing temperature to 600-650 ℃. In the step S2, the speed is slowly reduced by 20m/min every ten seconds. In the step S3, 15% -20% of air quantity of each section of cooling fan is adjusted. In the step S4, the opening degree of the fans of the quick cooling section and the slow cooling section is reduced, and the opening degree is reduced by 5% -10%. The step S5 comprises the steps of stopping the machine and reducing the coiling tension to 1.5-2.2KN, restarting the production line, waiting for the stable production line speed, and recovering the coiling tension after observing that the strip steel has no buckling. The step S5 comprises the steps of stopping and reducing the temperature, cooling by the combustion air of the annealing furnace, and slowly pulling the strip steel out of the furnace. In the step S5, when the thickness of the strip steel is not more than 0.4mm, stopping the machine and cooling to 400 ℃. The method has the technical effects that by adopting the method for stopping and starting the thin strip steel with the thickness not more than 0.5mm, the running speed and the annealing temperature of the production line are controlled by adjusting the coiling tension of each section in the furnace, the air quantity and the opening degree of the cooling fan are regulated, the risk of buckling and deviation when the strip steel runs in the furnace is effectively reduced in the stopping and starting process of the thin strip steel, the