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What are the characteristics of packaging steel strip steckel rolling?
by：Hongmei
2021-03-15
What are the characteristics of packaging steel strip steckel rolling?
Answer: The working frame of the Steckel rolling mill is divided into two parts, the front and rear, and is equipped with a coiler with a holding furnace, so it can realize the reversible rolling of the coiled strip under the hot state.
The main advantage of the Steckel mill is that it can greatly reduce the temperature drop of the strip during the rolling process. Therefore, the rolling pass can be flexibly changed, and various hot-rolled coils can be produced.
is suitable for rolling special steel strips with narrow processing temperature range that are difficult to deform, and can adjust the furnace temperature and control the final rolling temperature of the rolled piece; secondly, compared with the continuous rolling mill, its equipment is lighter and covers an area small.
The disadvantages of Steckel mill are:
(1) The product quality is relatively poor. Due to the low rolling speed and fast heat dissipation of the strip head and tail, the thickness deviation of the rolled strip head and tail is large; in addition, the finishing rolling time is long, and the atmosphere in the furnace needs to be controlled, otherwise there will be more secondary oxide scales, which will deteriorate the surface quality of the strip. .
(2) The operation of the rolling mill is complicated, the rolls are easy to wear, and the rolls are changed frequently, and the production capacity of the rolling mill is not high, which affects the widespread use of the Steckel rolling mill.
The production process and equipment layout of ' Steckel Mill' are shown in Figure 1-4. After the slab is heated in a continuous heating furnace, it is descaled by high-pressure water, and then rolled a certain number of passes on a two-high wide spreading mill and a four-high universal roughing mill with vertical rolls to roll the slab to a thickness of 10- The 20mm strip is cut off the head and tail on the flying shear, and then fed into the four-roll reversing finishing mill of the furnace coiler for reversible rolling. When the head of the first strip is out of the coil rolling mill, the lifting guide on the left is lifted, and the head is introduced into the coiler on the left for coiling. The strip tension between the coiler and the rolling mill is not large. The maximum total tension of the coiler is 30kN. As soon as the roll is exited from the tail of the first rolling piece, the feed roll on the left goes down, the whole unit reverses, and the second rolling is started. At this time, the feed roll on the right and the lifting guide are lifted, and the strip is guided into the furnace on the right. Coiling in the inner coiler. Rolling several times in this way, that is, rolling into the required coil. Since the end of each rolled piece needs to pass through the rolls, it is necessary to roll at the bite speed at the beginning of each pass, so that the end of the rolled piece can easily enter the coiler. After biting, the speed of the coiler and the rolling mill are synchronized to the normal rolling speed, and at the end of each pass, it must be braked in time to prevent the tail of the rolled piece from entering the holding furnace. Such a frequently changed operating system must rely on automatic control to achieve, and this also limits the increase in rolling speed. Generally, the rolled product is rolled 3-5 times on the Steckel rolling mill, and after rolling to the required strip thickness, it is cooled to the coiling temperature by the transport roller table, and then coiled into a steel coil on the finished product coiler.
The product thickness range of the rolling mill is generally 1.5-10mm, the rolling speed range is 0.5-8.5m/s, and the annual output is about 150,000 to 600,000 tons. The annual output of advanced rolling mills, such as rolling mills, can reach more than 1 million tons, or even up to 2 million tons.
Answer: The working frame of the Steckel rolling mill is divided into two parts, the front and rear, and is equipped with a coiler with a holding furnace, so it can realize the reversible rolling of the coiled strip under the hot state.
The main advantage of the Steckel mill is that it can greatly reduce the temperature drop of the strip during the rolling process. Therefore, the rolling pass can be flexibly changed, and various hot-rolled coils can be produced.
is suitable for rolling special steel strips with narrow processing temperature range that are difficult to deform, and can adjust the furnace temperature and control the final rolling temperature of the rolled piece; secondly, compared with the continuous rolling mill, its equipment is lighter and covers an area small.
The disadvantages of Steckel mill are:
(1) The product quality is relatively poor. Due to the low rolling speed and fast heat dissipation of the strip head and tail, the thickness deviation of the rolled strip head and tail is large; in addition, the finishing rolling time is long, and the atmosphere in the furnace needs to be controlled, otherwise there will be more secondary oxide scales, which will deteriorate the surface quality of the strip. .
(2) The operation of the rolling mill is complicated, the rolls are easy to wear, and the rolls are changed frequently, and the production capacity of the rolling mill is not high, which affects the widespread use of the Steckel rolling mill.
The production process and equipment layout of ' Steckel Mill' are shown in Figure 1-4. After the slab is heated in a continuous heating furnace, it is descaled by high-pressure water, and then rolled a certain number of passes on a two-high wide spreading mill and a four-high universal roughing mill with vertical rolls to roll the slab to a thickness of 10- The 20mm strip is cut off the head and tail on the flying shear, and then fed into the four-roll reversing finishing mill of the furnace coiler for reversible rolling. When the head of the first strip is out of the coil rolling mill, the lifting guide on the left is lifted, and the head is introduced into the coiler on the left for coiling. The strip tension between the coiler and the rolling mill is not large. The maximum total tension of the coiler is 30kN. As soon as the roll is exited from the tail of the first rolling piece, the feed roll on the left goes down, the whole unit reverses, and the second rolling is started. At this time, the feed roll on the right and the lifting guide are lifted, and the strip is guided into the furnace on the right. Coiling in the inner coiler. Rolling several times in this way, that is, rolling into the required coil. Since the end of each rolled piece needs to pass through the rolls, it is necessary to roll at the bite speed at the beginning of each pass, so that the end of the rolled piece can easily enter the coiler. After biting, the speed of the coiler and the rolling mill are synchronized to the normal rolling speed, and at the end of each pass, it must be braked in time to prevent the tail of the rolled piece from entering the holding furnace. Such a frequently changed operating system must rely on automatic control to achieve, and this also limits the increase in rolling speed. Generally, the rolled product is rolled 3-5 times on the Steckel rolling mill, and after rolling to the required strip thickness, it is cooled to the coiling temperature by the transport roller table, and then coiled into a steel coil on the finished product coiler.
The product thickness range of the rolling mill is generally 1.5-10mm, the rolling speed range is 0.5-8.5m/s, and the annual output is about 150,000 to 600,000 tons. The annual output of advanced rolling mills, such as rolling mills, can reach more than 1 million tons, or even up to 2 million tons.
