CN103252354A

CN103252354A - Method for controlling side turning of hot rolling stainless steel band

Info

Publication number: CN103252354A
Application number: CN2013101840064A
Authority: CN
Inventors: 赵新刚; 裴建文
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2013-05-17
Filing date: 2013-05-17
Publication date: 2013-08-21
Anticipated expiration: 2033-05-17
Also published as: CN103252354B

Abstract

A method for controlling side turning of a hot rolling stainless steel band belongs to the metallurgy field. The method is characterized in that regarding a rough rolling vertical roll, the side pressure of a first pass is smaller than and equal to 200KN, the side pressure of a third pass is from 300KN to 800KN, and the side pressure of a fifth pass is from 100KN to 300KN. Regarding a rough rolling flat roll, the reduction rate of a first pass is 54.1%, the reduction rate of a second pass is 44.5%, the reduction rate of a third pass is 33.8%, the reduction rate of a fourth pass is 23%, and the reduction rate of a fifth pass is 14.1%. By means of reasonable control of flow deformation of metal in the process of stainless steel hot rolling, the method for controlling side turning of the hot rolling stainless steel band controls rough rolling and broadsiding in an appropriate range, effectively controls the side turning width of the stainless steel band, reduces trimming amount of cold rolling finished products, and improves yield of the cold rolling finished products.

Description

The control method of a kind of hot-rolled stainless steel band edge portion rollover

Technical field

The invention belongs to field of metallurgy, be specifically related to the control method of a kind of hot-rolled stainless steel band edge portion rollover.

Background technology

Stainless steel has features such as good corrosion resistance, heat-resisting quantity, lower temperature resistance, mar proof and exquisite appearance, and purposes is very extensive, and critical role is occupied in the aspect in that space flight, petrochemical industry, ocean development and family be civilian etc.

The stainless steel technological process of production is mainly at present: steel-making → continuous casting → hot rolling → raw material annealing and pickling → cold rolling → finished products pickling → finished product is cut edge, the storehouse is handed in packing.

Because stainless steel casting blank not reconditioning of side, the surface exists oscillation mark, wrinkle etc., coarse through heating furnace high-temperature heated oxide rear surface, multi-pass through edger roll and plain-barreled roll is rolling, roll into the thick hot rolled coil of 3～5mm from thickness 200mm strand, roll thin trailing flank metal and turn to belt steel surface, form the elongated rough zone along band steel dual-side portion, does not eliminate cold rolling back, for guaranteeing cold rolling finished surface quality, general finished product will cut away both sides portion rough zone back delivery, so cold rolling finished product side cut amount what strip edge portion rollover width directly has influence on, influences the cold drawing lumber recovery.Before not taking this control method, the one-sided rollover width of stainless steel limit portion is generally controlled at 13～16mm, can only all cut away behind cold rolling finished product, causes bigger metal loss, so it is anxious to be solved how to reduce this problem of rollover width.

Summary of the invention

In order to reduce cold rolling finished product side cut amount, improve cold rolling finished product lumber recovery, the present invention spreads control by rationally controlling the flow deformation of metal in the stainless steel hot-rolling process in OK range with roughing, effectively controls stainless steel band edge portion rollover width.

Consider in the stainless steel hot-rolling process produce the rollover defective mainly be since in the operation of rolling continuous casting billet side be turned to belt steel surface and form, so reduction ratio has bigger relation when rollover width and edger roll lateral pressure and flat rolling.By reasonable each passage lateral pressure of setting roughing edger roll, each percentage pass reduction of plain-barreled roll, control strand limit portion metal is to surperficial liquidity preference.

By the rolling data of comparative analysis process, follow the tracks of in conjunction with belt steel surface rollover width, find that rollover width and edger roll lateral pressure have very strong corresponding relation, the side pressure of ordinary circumstance edger roll is more big, the rollover width is more wide, after the edger roll side pressure reached a desired value, minimum of a value appearred in the rollover width, and different rolling pass influence degrees there are differences simultaneously.For rationally controlling the edger roll lateral pressure, need be optimized continuous casting billet and hot rolling width coupling, realize the little side pressure control strategy of edger roll.Namely adopt broadening, little side pressure production technology, require the hot rolling finished width by greater than blank width and control within the specific limits; Each the passage side pressure of reasonable distribution edger roll is determined first and third, five each passage lateral pressure control ranges in conjunction with actual measurement rollover width value.

The analysis showed that simultaneously also there is certain influence in roughing plain-barreled roll reduction ratio to band steel rollover width, percentage pass reduction distributes improper, and the percentage pass reduction change too greatly also can cause rollover to widen, so need each percentage pass reduction rationally to be revised transitions smooth.

The control method of a kind of hot-rolled stainless steel band edge portion rollover is characterized in that each passage lateral pressure of roughing edger roll is respectively a time≤200KN, and three passages are 300～800KN, and five passages are 100～300KN; The reduction ratio of each passage of roughing plain-barreled roll is respectively that 1 passage is that 54.1%, 2 passage is that 44.5%, 3 passages are that 33.8%, 4 passages are that 23%, 5 passages are 14.1%.

The present invention rolls with stainless steel hot-rolling flanging part rollover width cooling and has obtained effective control, one-sided rollover width is down to 11.5mm from average 14mm, make the one-sided 2.5mm that reduced of cold rolling rip cutting side cut amount, by band steel mean breadth 1255mm, then can improve cold rolling lumber recovery: (2 * 2.5mm) ÷ 1255mm=0.398%.

Taiyuan Iron and Steel Co. 1549 lines are produced 600000 tons of stainless steels per year, and steel scrap and finished product price difference, improve the annual wound that amounts to of lumber recovery and imitate: 600000 tons of * 0.398% * 3600 yuan/ton=859.68 (ten thousand yuan) owing to reduce the cold rolling damage of cutting by 3600 yuan/ton.

The specific embodiment

By collecting all kinds of rolling data in the stainless steel hot-rolling process, in conjunction with belt steel surface rollover width measured value, through Comparative Study, guaranteeing on width and the rolling stability basis, developed Taiyuan Iron and Steel Co. hot continuous rolling 1549 line strip edge portions rollover control method.Main technical schemes is as follows:

1. optimize continuous casting billet and hot rolled coil finished width coupling, realize that little broadening is rolling.

For guaranteeing the hot rolled coil finished width, require simultaneously to realize that roughing edger roll lateral pressure can not be too big, need rationally mate continuous casting billet and hot rolled coil, by little broadening control strategy, through test of many times, determined that continuous casting material width desired value specific heat is rolled into the narrow 5mm control of product width.

2. determine each passage lateral pressure controlling value of roughing edger roll

Carry out the multiple-factor multilevel test by experimental design DOE, found the optimum lateral pressure control parameter that can realize that the rollover of strip edge portion is minimum:

The roughing passage	A time	Three passages	Five passages
				Edger roll lateral pressure control range	≤200KN	300～800KN	100～300KN

3. optimize roughing edger roll pressure control model, realize that each passage lateral pressure of edger roll is worth automatic control on request, the operative employee monitors, and can manually revise spacious and comfortable amount according to the lateral pressure situation.

4. each percentage pass reduction of roughing plain-barreled roll is rationally determined:

Figure 2013101840064100002DEST_PATH_IMAGE001

Claims

1. the control method of a hot-rolled stainless steel band edge portion rollover is characterized in that each passage lateral pressure of roughing edger roll is respectively a time≤200KN, and three passages are 300～800KN, and five passages are 100～300KN; The reduction ratio of each passage of roughing plain-barreled roll is respectively that 1 passage is that 54.1%, 2 passage is that 44.5%, 3 passages are that 33.8%, 4 passages are that 23%, 5 passages are 14.1%.