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Control process for performances of steel plate during hot rolling and flat rolling process of single-stand steckel mill

A technology of a single-stand steel-steel rolling mill, which is applied in the field of performance control of hot-rolled flat-rolled steel plates in a single-stand steel-steel rolling mill. Performance qualification rate, optimization of steel burning process, and improvement of primary rolling yield

Active Publication Date: 2011-10-26
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for billets with a rolling length of more than 9m, during the rolling process, as the steel plate becomes thinner and thinner during the rolling process, the temperature drop of the steel plate will become faster and faster, resulting in an extremely uneven temperature distribution along the length of the rolled piece. Uniform, resulting in uneven or even inconsistent performance distribution

Method used

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  • Control process for performances of steel plate during hot rolling and flat rolling process of single-stand steckel mill
  • Control process for performances of steel plate during hot rolling and flat rolling process of single-stand steckel mill

Examples

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Embodiment 1

[0017] A performance control process for hot-rolled flat-rolled steel sheets in a single-stand furnace coil mill. The process requires a furnace temperature of 1200°C, a rolling pass of 4+7 passes, a second-stage rolling temperature of 890°C, and a billet thickness of 3.2 hours after warming. The heating temperature of the middle tail is 1220°C, 1200°C, and 1230°C in sequence; the first to third passes start the large scale descaling of the rolling mill, and the fifth to tenth passes start high pressure and small flow: the odd pass is opened in the first half of the rolled piece, and the even pass Open at the second half of the rolled piece, and open the air purge of the coil rolling mill in the 5th to 11th passes; the original steel throwing speed is 1.50m / s 2 , acceleration 0.015 m / s 2 ;When the steel throwing is finished, the cooling water of the penultimate group will be automatically closed; the edge shielding of the cooling system will be enabled, and each side will be s...

Embodiment 2

[0026] A control process for the performance uniformity of hot-rolled flat-rolled steel sheets in a single-stand furnace coil mill. The process requires a furnace temperature of 1200°C, a rolling pass of 4+7 passes, a second-stage rolling temperature of 940°C, and a thickness of the billet to be warmed for 3.5 hours. , the heating temperature of the head, middle and tail of the billet is 1215°C, 1200°C, and 1240°C in sequence; the first to third passes start the large descaling of the rolling mill, and the sixth to tenth passes start high pressure and small flow: odd passes are opened in the first half of the rolled piece, The even pass is opened in the second half of the rolled piece, and the air purge of the coil rolling mill is started in the 5th to 11th passes; the original steel throwing speed is 1.54m / s 2 , acceleration 0.01 m / s 2 ;When steel throwing is finished, the cooling water of the penultimate group 1 and 2 will be automatically closed; the side shielding of the c...

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Abstract

The invention discloses a control process for performances of a steel plate during hot rolling and flat rolling process of a single-stand steckel mill, which is characterized in that the steel burning temperature at two ends of a heating furnace is 15-40 DEG C higher than that in the middle, the tail temperature of the billet is 10-25 DEG C higher than that at the head; on the procedure without adoption of the steckel mill for scale removal, an air purging system is started and no accumulated water is left on the surface during the rolling process; after a pyrometer detects that the temperature difference of a rolled piece is larger than 50 DEG C, the mill increases the steel throwing speed by an acceleration smaller than 0.02m / s<2>; after a pyrometer detects that the temperature difference of a rolled piece is larger than 30 DEG C, a laminar flow system automatically closes the last one to three groups of cooling water, so as to improve the temperature rise at the tail of the rolled piece and reduce the temperature rise difference of the rolled piece; and for a wide steel plate, a cooling system adopts edge shielding so as to remove temperature difference between the upper edge and the middle along the width direction. By adopting the process in the invention, the performance uniformity of the steel plate flatly rolled by the single-stand steckel mill can be ensured.

Description

technical field [0001] The invention belongs to the field of steel rolling, and relates to a process for flat-rolling steel plates with a single-stand furnace rolling mill, in particular to a performance control process for hot-rolling flat-rolled steel plates with a single-stand furnace coil mill for improving the performance uniformity of steel plates. Background technique [0002] At present, when the single-stand furnace coil mill is hot-rolling flat-rolled steel, as the billet becomes thinner and thinner during the rolling process, the temperature drop of the rolled piece becomes faster and faster, especially along the length direction of the steel plate, the actual temperature difference of the steel plate after rolling is at Above 100°C, the corresponding performance fluctuation is above 50MPa. After the rolled piece enters the cooling water, the temperature difference along the length of the steel plate will worsen after cooling, especially the temperature at the tail...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00B21B37/74B21B37/46B21B37/44
Inventor 赵显鹏王道远梁江民
Owner NANJING IRON & STEEL CO LTD
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