CN103042043A

CN103042043A - Method for controlling strip steel head and tail widths through coil box production process

Info

Publication number: CN103042043A
Application number: CN2013100167185A
Authority: CN
Inventors: 王津平; 任万牢; 张维利
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2013-01-17
Filing date: 2013-01-17
Publication date: 2013-04-17

Abstract

Disclosed is a method for controlling strip steel head and tail widths through a coil box production process. The method is characterized in that six parameters of the steel type, the width, the side pressure amount, the hot rolling thickness and the coiling box utilization mode are set in a width control system of a coil box in a 2250mm hot rolling production line; head and tail short stroke width control is performed on account of the six parameters, that is, vertical roll opening degree adjusting is performed once at an interval of 300mm in a 1.5m length range of the head and tail of a strip steel entering an edging mill; and the hot rolling thickness is set to be in a range of a first grade and a third grade, that is, the thickness of the first grade is smaller than 2.9mm, the thickness of the second grade is larger than or equal to 2.9mm and smaller than 12.5mm, and the thickness of the third grade is smaller than or equal to 2.9mm. According to the method, the dimension control accuracy of the head and the tail of the 2250mm hot rolling production line are improved greatly, the hit rate in a range of 0mm to 12mm is improved to 94.7% from 90%, the width abnormal product rate is reduced to 0.5% from 1.86%, and the width and quality of products are improved greatly.

Description

Adopt Coil Box production technology band steel toe tail width control method

Technical field

The invention belongs to the steel rolling field, be specially 2250mm milling train Coil Box hot-strip head and tail width technology processed.

Background technology

Coil Box is between hot continuous rolling production line roughing mill and finishing mill, and its function is that the intermediate blank after the roughing is batched, and then oppositely uncoiling enters mm finishing mill unit.Adopt the afterbody of Coil Box coiling process band steel to become the head of uncoiling process band steel, thereby reduced the temperature difference with steel head and afterbody; Coiling technique has reduced the intermediate blank surface radiating simultaneously, reduces the mm finishing mill unit rolling load; In addition, because the intermediate blank that will grow is batched rolling, can shorten the rolling line overall length, reduce construction investment etc.

At present, the whole world has more than 50 platform Coil Box to be applied to hot continuous rolling production approximately, and domestic many iron and steel enterprises have adopted the Coil Box technology in broadband fever tandem rolling unit.

The Taiyuan Iron and Steel Co. 2250mm hot rolling line Coil Box mode of batching is mainly used in the production of thin gauge strip that rolling temperature is had higher requirements, to realize the steady production of wide thin hot-strip.Rolling thickness does not take Coil Box to batch mode greater than the band steel of 8mm specification basically, but adopts the Coil Box direct-passing mode, and namely the intermediate blank after the roughing directly enters mm finishing mill unit and is rolled.

Rolling thickness adopts Coil Box to batch less than the band steel of 6mm specification.Adopt Coil Box to batch so that the cephlad-caudal of intermediate blank is changed, adopt Coil Box to batch with the Coil Box direct-passing mode with steel and use identical end to end short stroke width control (SSC) parameter, product width size Control precision is low, super wide or wide negative phenomenon is serious end to end, causes than large economy and loses.

Summary of the invention

The invention provides a kind of employing Coil Box production technology band steel toe tail width control method, its objective is at rolling thickness and batch less than the band steel employing Coil Box of 6mm specification, avoid end to end super wide or wide negative phenomenon.Thereby improve finished strip head and tail width control accuracy, the improving product quality in kind.

The present invention includes the width control system of 2250mm hot rolling line Coil Box and short stroke width control (SSC) parameter end to end thereof, it is characterized in that in the width control system of 2250mm hot rolling line Coil Box, set steel grade, width, lateral pressure amount, hot rolling thickness, 6 parameters of Coil Box occupation mode, carry out head for these 6 parameters, the control of afterbody short stroke width, namely be rolled in the head 1.5m length range with steel and carry out the edger roll regulation once every 300mm entering vertical miller, carries out the edger roll regulation once every 300mm in the tail length scope.

The hot rolling thickness setting is 1 ~ 3 grade, and namely 1 grade is thickness＜2.9mm, and 2 grades is 2.9mm≤thickness＜6.5mm, and 3 grades is 6.5mm≤thickness＜12.5mm.

The short stroke width control system uses Ssc_CB_H, Ssc_CB_T parameter that the band steel of thickness＜2.9mm is controlled end to end, and Ssc_CB_H_1, Ssc_CB_H_2 correspond respectively to the 2nd grade, the 3rd grade head short stroke parameter; Ssc_CB_T_1, Ssc_CB_T_2 correspond respectively to the afterbody short stroke parameter of the 2nd to the 3rd thickness shelves.

After adopting the present invention, 2250mm hot rolling line head and tail width size Control precision has obtained larger improvement, and 0 ~ 12mm hit rate brings up to 94.7% by 90%, and width abnormal article rate drops to 0.5% by 1.86%, has significantly promoted the product width quality in kind.

Drop to 0.5% by width abnormal article rate by 1.86%, 8000 pieces/month of average amounts of rolling, band steel ton weighs 30 tons/piece, and certified products is declared 300 yuan/tons of product price differences with changing to fall, then the annual wound effect that amounts to: ten thousand yuan of (1.86%-0.52%) * 8000 * 30 * 300 * 12=1157.76()

Description of drawings

Fig. 1 is control schematic diagram of the present invention.

The specific embodiment

1. batch mode according to Coil Box, improve end to end short stroke width control (SSC) algorithm, S ^REF=S ^SU+ S ^SS,, wherein, S ^SUBe edger roll opening degree setting value, S ^SSBe regulated quantity (head and each 1.5m length of afterbody with steel are a point of adjustment every 300mm, amount to 5 points, to reach desirable product head and tail width control accuracy), S ^REFBe short stroke width control parameter.

A) check whether current rolled band steel uses the Coil Box coiling technique;

B) if use Coil Box to batch, the S in the short stroke control algolithm end to end then ^SSTake width control parameter (Ssc_H_CB) at the band steel head respectively, take width control parameter (Ssc_T_CB) at band steel afterbody

As shown in Figure 1, be exactly to be rolled each 1.5m of head and afterbody with steel and to grow and carry out the edger roll regulation every 300mm entering vertical miller with steel toe tail short stroke control, to reach desirable product head and tail width control accuracy.Ssc_H_CB, Ssc_T_CB represent respectively to batch for Coil Box the edger roll regulation value of five points of mode head and afterbody use.

2. because the Coil Box mode of batching is mainly used in the steady production of wide thin hot-strip, therefore, the occupation mode of Coil Box and rolled band steel thickness are closely related, are considering that different steel thickness is on the impact of head and tail width control accuracy in the short stroke control end to end.

A) for this reason, we are divided into 1 ~ 3 grade with thickness, are respectively thickness＜2.9mm, 2.9mm≤thickness＜6.5mm, 6.5mm≤thickness＜12.5mm, 12.5mm≤thickness.

B) according to 3 grades of thickness classification, increase end to end short stroke control parameter.The short stroke width control system uses Ssc_CB_H, Ssc_CB_T that the band steel of thickness＜2.9mm is controlled end to end, and Ssc_CB_H_1, Ssc_CB_H_2, Ssc_CB_H_3 correspond respectively to the head short stroke parameter of the 2nd to the 3rd thickness shelves; Ssc_CB_H_1, Ssc_CB_H_2, Ssc_CB_H_3 correspond respectively to the afterbody short stroke parameter of the 2nd to the 3rd thickness shelves.

3. follow the tracks of and produce, according to steel grade, width, lateral pressure amount, thickness, Coil Box occupation mode short stroke width control parameter is optimized, so that band steel toe tail on average super wide amount controlled to below the 16mm, the strip width control accuracy has obtained significantly promoting.

Claims

1. adopt Coil Box production technology band steel toe tail width control method, Coil Box is 2250mm hot rolling line Coil Box, it is characterized in that in the width control system of 2250mm hot rolling line Coil Box, set steel grade, width, lateral pressure amount, hot rolling thickness, 6 parameters of Coil Box occupation mode, carry out head, the control of afterbody short stroke width for these 6 parameters, namely be rolled in the head 1.5m length range with steel and carry out the edger roll regulation once every 300mm entering vertical miller, carries out the edger roll regulation once every 300mm in the tail length scope; Described hot rolling thickness setting is 1 ~ 3 grade, and namely 1 grade is thickness＜2.9mm, and 2 grades is 2.9mm≤thickness＜6.5mm, and 3 grades is 6.5mm≤thickness＜12.5mm.