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Outline of Hot Rolling Mill for Packaging Steel Strip
by：Hongmei
2021-03-15
Outline of Hot Rolling Mill for Packaging Steel Strip
Hot strip rolling mills can be roughly divided into two types: one type is a continuous rolling mill that passes through the heating furnace to the coiler in one direction, and the other type is rolled back and forth on the roughing mill. Semi-continuous rolling mill.
The steel rolling workshop is composed of heating furnace-rough rolling-finishing rolling-coiling and other processes. After the surface is cleaned, the blank is loaded into a heating furnace and heated to approximately 1250-1300°C. According to the feeding method, the continuous heating furnace has two types: pusher type and walking hearth type. If the output of each furnace exceeds 350 tons/hour, 3-5 furnaces are usually available.
The rough rolling mill is composed of a descaling machine, a two-high rolling mill with vertical rolls, and a continuous four-high rolling mill consisting of 5-6 stands, and a semi-continuous rolling mill consisting of 1-4 rolling mills. There are also the last few rolling mills in series. In order to remove the oxide scale on the surface of the rolled product, a descaling equipment sprayed with high pressure water of 100-150 kg/cm2 is also provided. When the plate leaves the last rolling mill, the thickness is 20 or 30 mm and is sent to the finishing mill.
On the finishing mill, the rough-rolled strip is cut head and tail with a head trimmer, then descaling, and finally rolled into a finished product on a 5-7 four-roll continuous milking machine with a thickness of 1.2-1.6 mm.
As the best measure to improve product quality, AGC (Automatic Thickness Control), accelerated rolling, shape control device, descaling equipment between racks, hot rolling lubrication device, support (tension between racks) are adopted Adjustment device) and other devices. As a detection device, it is equipped with X-ray thickness gauge, width gauge, thermometer, etc., to ensure that the hot-rolled steel plate with uniform performance, accurate size, good surface quality and plate shape from the head to the tail of the rolling piece can be produced .
The strip steel from the finishing mill is cooled on the output roller table with laminar flow or spray cooling water to control the material of the strip. Finish rolling exit temperature and coiling temperature are important factors affecting the mechanical properties of strip steel. Generally, the finish rolling exit temperature is controlled between 800-900℃, and the coiling temperature is between 550-700℃.
There are two types of coiler: down coiler and above ground coiler^ The former is usually used, with 2-3 units installed. The coils leaving the coiler are bundled, printed, weighed, and sent to the following processes.
is such a hot strip rolling mill. It is also often necessary to pay attention to user requirements and make improvements. It is also necessary to fully adopt computer control and establish a production system that can produce low-cost and high-quality products on schedule. This is not excessive. The combined use of the business computer and the process computer is aimed at shortening the delivery date, improving the level of project management and quality, and improving productivity. In terms of productivity, there are already rolling mills with an annual output of approximately 5.6 million tons.
Hot strip rolling mills can be roughly divided into two types: one type is a continuous rolling mill that passes through the heating furnace to the coiler in one direction, and the other type is rolled back and forth on the roughing mill. Semi-continuous rolling mill.
The steel rolling workshop is composed of heating furnace-rough rolling-finishing rolling-coiling and other processes. After the surface is cleaned, the blank is loaded into a heating furnace and heated to approximately 1250-1300°C. According to the feeding method, the continuous heating furnace has two types: pusher type and walking hearth type. If the output of each furnace exceeds 350 tons/hour, 3-5 furnaces are usually available.
The rough rolling mill is composed of a descaling machine, a two-high rolling mill with vertical rolls, and a continuous four-high rolling mill consisting of 5-6 stands, and a semi-continuous rolling mill consisting of 1-4 rolling mills. There are also the last few rolling mills in series. In order to remove the oxide scale on the surface of the rolled product, a descaling equipment sprayed with high pressure water of 100-150 kg/cm2 is also provided. When the plate leaves the last rolling mill, the thickness is 20 or 30 mm and is sent to the finishing mill.
On the finishing mill, the rough-rolled strip is cut head and tail with a head trimmer, then descaling, and finally rolled into a finished product on a 5-7 four-roll continuous milking machine with a thickness of 1.2-1.6 mm.
As the best measure to improve product quality, AGC (Automatic Thickness Control), accelerated rolling, shape control device, descaling equipment between racks, hot rolling lubrication device, support (tension between racks) are adopted Adjustment device) and other devices. As a detection device, it is equipped with X-ray thickness gauge, width gauge, thermometer, etc., to ensure that the hot-rolled steel plate with uniform performance, accurate size, good surface quality and plate shape from the head to the tail of the rolling piece can be produced .
The strip steel from the finishing mill is cooled on the output roller table with laminar flow or spray cooling water to control the material of the strip. Finish rolling exit temperature and coiling temperature are important factors affecting the mechanical properties of strip steel. Generally, the finish rolling exit temperature is controlled between 800-900℃, and the coiling temperature is between 550-700℃.
There are two types of coiler: down coiler and above ground coiler^ The former is usually used, with 2-3 units installed. The coils leaving the coiler are bundled, printed, weighed, and sent to the following processes.
is such a hot strip rolling mill. It is also often necessary to pay attention to user requirements and make improvements. It is also necessary to fully adopt computer control and establish a production system that can produce low-cost and high-quality products on schedule. This is not excessive. The combined use of the business computer and the process computer is aimed at shortening the delivery date, improving the level of project management and quality, and improving productivity. In terms of productivity, there are already rolling mills with an annual output of approximately 5.6 million tons.
