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A control method for warping of hot-rolled variety steel in rough rolling

A control method and rough rolling technology, applied in the direction of metal rolling, tail end control, etc., can solve problems such as technical solutions for the prevention of production at the source of warping, and achieve the goal of improving business level and subjective initiative, enhancing intervention ability, and avoiding equipment damage. Effect

Active Publication Date: 2019-12-31
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing technologies are designed for the response device after the rough rolling of the hot rolling production line, but there is no production technical scheme design for the prevention of the source of the warp, especially for the production of variety steel

Method used

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  • A control method for warping of hot-rolled variety steel in rough rolling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The embodiment of the present invention provides a method for controlling warping in rough rolling of hot-rolled variety steel. The warping control process includes rough rolling preparation, slab heating, furnace descaling, and rough rolling in sequence. The control method includes:

[0027] The grade of the slab is 420CL steel for wheels, and the thickness is 135mm. The slab is heated in a furnace, and the temperature of the slab is controlled to be completely uniform. There is no black mark on the end face of the slab, and there is no obvious watermark. . After the slab comes out of the furnace, it enters the descaling box for surface descaling. Two rows of descaling headers are opened, the outlet pressure of descaling water is 20MPa, and there is no iron oxide residue on the surface of the slab at the descaling outlet. After descaling, the slab enters the roughing single stand for 3 times of round-trip rolling, of which the first pass is descaling with high-pressure...

Embodiment 2

[0030] The embodiment of the present invention provides a method for controlling warping in rough rolling of hot-rolled variety steel. The warping control process includes rough rolling preparation, slab heating, furnace descaling, and rough rolling in sequence. The control method includes:

[0031] The grade of the slab is X52 pipeline steel with a thickness of 150mm. The slab is heated in a furnace, and the temperature of the slab is controlled to be completely uniform. There is no black mark on the end face of the slab, and there is no obvious watermark. . After the slab comes out of the furnace, it enters the descaling box for surface descaling. The descaling headers are opened in 4 rows, the outlet pressure of the descaling water is 18MPa, and there is no iron oxide residue on the surface of the slab at the descaling outlet. After descaling, the slab enters the roughing single stand for 3 times of round-trip rolling, of which the first pass is descaling with high-pressure...

Embodiment 3

[0034] The embodiment of the present invention provides a method for controlling warping in rough rolling of hot-rolled variety steel. The warping control process includes rough rolling preparation, slab heating, furnace descaling, and rough rolling in sequence. The control method includes:

[0035] The grade of the slab is X52 pipeline steel with a thickness of 145mm. The slab is heated in a furnace, and the temperature of the slab is controlled to be completely uniform. There is no black mark on the end face of the slab, and there is no obvious watermark. . After the slab comes out of the furnace, it enters the descaling box for surface descaling. The descaling headers are opened in 4 rows, the outlet pressure of the descaling water is 18MPa, and there is no iron oxide residue on the surface of the slab at the descaling outlet. After descaling, the slab enters the roughing single stand for 3 times of round-trip rolling, of which the first pass is descaling with high-pressure...

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Abstract

The invention relates to a control method of head warping of rough rolling of hot-rolled variety steel. The control method comprises the following steps of rough rolling preparation, wherein for roughrolling preparation, whether the rolling condition is possessed or not is confirmed, and before rolling is carried out, the attaching state of a guide and a water cutting plate to a rolling roller ischecked; plate blank heating, wherein after the rolling condition is possessed, a hot-rolled blank with the thickness of 135 mm-150 mm is heated, temperature uniformity of the plate blank is ensured,no black marks exist on the end face of the plate blank discharged out of a furnace, no obvious marks exist on the surface, and otherwise, the plate blank is returned to the furnace to be treated; furnace discharging phosphorous removal, wherein the surface of the discharged plate blank obtained after phosphorous removal is smooth and free of scale residues, and the plate blank with the scale removed incompletely is returned to the furnace to be treated; and rough rolling, wherein after phosphorous removal is carried out, the plate blank enters rough rolling to be subjected to three-time rolling. According to the control method, the head warping tendency of the plate blank is weakened from the source, the large head warping phenomenon of the plate blank is reduced, thus the occurrence probability of the head warping phenomenon is effectively reduced, the production stability is improved, equipment damage caused by accidents is avoided, the production cost of the production line is reduced, and economic benefits of enterprises are increased.

Description

technical field [0001] The invention relates to the technical field of hot rolling, in particular to a method for controlling warpage in rough rolling of hot-rolled variety steel. Background technique [0002] In the practice of hot rolling production, some slab warping phenomenon often occurs during the rolling process in the rough rolling area, especially in the production of variety steel, the warping phenomenon is more common and the degree of warping is relatively large. Head warping refers to the phenomenon that the shape of the head of the slab is not straight, but upward bending occurs. The warping of the slab increases the difficulty of rough rolling production. When the warping is serious, the rolls of the roughing mill cannot bite into the slab or the slab bumps against the upper equipment during the traveling process, causing steel jamming or equipment damage accidents. Because the warped head jamming often causes a large area of ​​strip steel in the rough rolli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/72B21B1/32
CPCB21B1/32B21B37/72
Inventor 王鹏刘培星王国强王专张文虎辛蕾朱宁宁杨子瑞魏玉胜孙玉磊
Owner SD STEEL RIZHAO CO LTD
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