CN102500628B

CN102500628B - Method for accurately calibrating widening positions of casting blank during steel rolling

Info

Publication number: CN102500628B
Application number: CN 201110358212
Authority: CN
Inventors: 吕延春; 刘洋; 丁文华; 王文军; 姜中行; 王玉龙; 朱志远; 王臻明; 江卫华; 王海宝; 隋鹤龙; 李战军; 沈钦义; 韦耀环; 关春阳
Original assignee: Shougang Corp
Current assignee: Shougang Group Co Ltd
Priority date: 2011-11-13
Filing date: 2011-11-13
Publication date: 2013-10-30
Anticipated expiration: 2031-11-13
Also published as: CN102500628A

Abstract

The invention discloses a method for accurately calibrating widening positions of a casting blank during steel rolling, which belongs to the technical field of steel rolling. Process includes that continuous casting corners are drilled at first, the diameter of each circular hole ranges from 2mm to 10mm, the holes are positioned at edges of a continuous casting blank, the distance from each hole to the corresponding edge ranges from 1mm to 100mm, and the depth of each hole ranges from 3mm to 50mm; then nickel columns are used as calibrating materials, and the diameter of each nickel column is equal to that of the corresponding drilled hole or smaller than that of the corresponding drilled hole by 0.5mm at most; a circular center of each nickel column is used as a measurement standard point after expansion so as to measure the distance from the standard point to each edge, and calibration of the widening positions is realized. The method has the advantages that the widening positions of various points of the corners of the continuous casting blank can be accurately calibrated after rolling of the continuous casting blank, the calibration positions are obvious after rolling and are easy to be found, and the calibration positions and the size of the widened continuous casting blank can be measured easily.

Description

A kind of method of accurate calibration widening positions of casting blank during steel rolling

Technical field

The invention belongs to technical field of steel rolling, particularly a kind of method of accurate calibration widening positions of casting blank during steel rolling.Mainly provide the location position of continuous casting billet and the method for demarcating Material selection.

Background technology

In recent years, the demand of high-grade high added value steel products increases day by day, in order to obtain good mechanical property of steel plate, usually when Composition Design, need add the microalloy elements such as niobium, but contain the niobium steel and in casting process, produce easily transverse corner crack, produced harmful effect and caused the limit to split defective to rolling rear steel plate easily rolling rear plate surface quality, if can't excision can cause steel plate to be scrapped after cutting edge.For this Current Situation, most steel mills must carry out corner cut to the strand that transverse corner crack occurs and process, and strand corner cut amount and roll rear swarf amount size and usually control by the maximum that can excise defective; But find that in actual production some exists the strand of small size transverse corner crack to process without corner cut, it is rolling directly to feed intake, and reasonably controls the side cut amount and excises defective rolling rear steel plate.Therefore, can be by research strand transverse corner crack position at different broadenings than the spread scenarios under the rolling condition, make every effort to find out the corresponding relation that defective locations and size are split in transverse corner crack position and size and surface of steel plate widthwise edge, in order to can more accurately control aborning strand corner cut amount and roll rear swarf amount, thereby improve recovery rate of iron and yield of steel plate, reduce cost.

The problem that exists at present be on can't the accurate calibration strand crack position with roll the corresponding relation of position on the rear steel plate, correlation technique is rare report also.Once University of Science ﹠ Technology, Beijing adopted the nailing mode to demarcate the strand position, through observing surface of steel plate steel nail position, the extension behavior of calculating strand after rolling.This kind method seldom adopts now, and reason is that high temperature strand nailing has danger, environment is abominable, and the nailing position is very inaccurate.

Summary of the invention

The object of the present invention is to provide a kind of method of accurate calibration widening positions of casting blank during steel rolling.Solved the problem that the crack position on the strand and the corresponding relation that rolls position on the rear steel plate can't accurate calibrations.

Concrete technology step of the present invention is as follows:

(1) boring of continuous casting corner section is processed, the diameter in hole is 2mm～10mm, circular port, and the hole site is in continuous casting billet limit section, and between 1mm～100mm, the degree of depth is between 3mm～50mm from limit section for pitch-row;

(2) with the nickel post as demarcating material, nickel column diameter size and bore diameter are quite or less than in the bore diameter 0.5mm;

(3) after rolling with the center of circle of nickel post as the measurement standard point after expanding, carry out the measurement of distance between this standard point and the limit section, this measurement length is the measurement result after spreading, and utilizes this result can know that the transverse corner crack of certain-length is in the length of rolling rear expansion.Rolling rear steel plate need to have the side cut amount of one fixed width, therefore can judge whether the transverse corner crack to the continuous casting billet in the daily production excises, or the excision amount in bight.

The nickel post adopts sheet nickel to process, and the purity of nickel plate is 95～100%.

The invention has the advantages that:

(1) can the expanding location of accurate calibration continuous casting billet bight each point after rolling;

(2) calibration position after rolling is obvious, is found easily, and is easy to measure institute's calibration position and size;

(3) the selection of material heating furnace not oxidized with fusing, and toughness and plasticity appropriate mix and steel plate deformed are synchronous.

Description of drawings

Fig. 1 is casting billet surface nickel post calibration maps.

Fig. 2 is for rolling rear surface of steel plate nickel post shape appearance figure.

The specific embodiment

Embodiment 1

A kind of method of accurate calibration widening positions of casting blank during steel rolling according to the present invention, adopting diameter is that the 5mm drill bit is holed respectively in the position of the distance casting blank limit 5mm of section, 10mm, 15mm, 20mm, 25mm and 30mm, hole depth is 30mm, and the distance between the adjacent boring is 100mm; Implanted diameter is that 5mm, length are the nickel post of 30mm again, and casting billet surface nickel post calibration maps as shown in Figure 1; Roll rear surface of steel plate nickel cylindricality looks as shown in Figure 2, take the center of distortion rear end face as basic point, measure after the distortion each root nickel post from the distance B of edges of boards.

The steel billet of specific embodiment 1～9 and plate size and broadening are than as shown in table 1, and it is as shown in table 2 from the distance B of edges of boards that it rolls rear surface of steel plate nickel post, roll rear swarf amount control and require as shown in table 3.

Table 1 embodiment steel billet and plate size and broadening ratio

Embodiment	Steel billet is thick * and wide	Steel plate is thick * and wide	The broadening ratio
				1	250*2000	20*2575	1.29
2	250*1800	20*2680	1.49
				3	250*2000	20*3600	1.80
4	250*2000	35*2575	1.29
				5	250*1800	35*2680	1.49

6	250*2000	35*3600	1.80
				7	250*2000	50*2580	1.29
8	250*1800	50*2685	1.49
				9	320*1800	50*3240	1.80

Table 2 rolls rear steel plate nickel post position

Table 3 rolls rear swarf amount control requirement

The broadening ratio	Require the control of side cut amount
		1.15≤broadening ratio≤1.4	+77mm
1.4＜broadening ratio≤1.7	+82mm
		1.7≤broadening ratio≤1.9	+117mm
1.9≤broadening ratio≤2.1	+127mm

By data analysis in table 2 and the table 3 as can be known, be that 20～50mm steel plate and broadening were at 1.29～1.80 o'clock for the rolling thickness specification, the strand of transverse corner crack below 15mm can be processed without corner cut, because it rolls rear steel plate longitudinal edge section transverse corner crack defective in desired side cut weight range.For example when rolling 50mm steel plate and broadening ratio were 1.49, steel plate transverse corner crack length was 34mm after the test, and monolateral side cut amount is controlled to be+41mm present first Qin Zhankuan than 1.49 o'clock, as seen rolled metapedes to excise steel plate edge transverse corner crack defective.

Claims

1. the method for an accurate calibration widening positions of casting blank during steel rolling is characterized in that, the concrete technology step is as follows:

(1) boring of continuous casting billet corner section is processed, the diameter in hole is 2mm ~ 10mm, circular port, and the hole site is in continuous casting billet limit section, and between 1mm ~ 100mm, the degree of depth is between 3mm ~ 50mm from limit section for pitch-row;

(2) with the nickel post as demarcating material, nickel column diameter size equates with bore diameter or less than bore diameter 0.5mm;

(3) after rolling with the center of circle of nickel post as the measurement standard point after expanding, carry out the measurement of distance between this standard point and the limit section, this measurement length is the measurement result after spreading, and utilizes this result can know that the transverse corner crack of certain-length is in the length of rolling rear expansion; Rolling rear steel plate need to have the side cut amount of one fixed width, can judge therefore whether the transverse corner crack to the continuous casting billet in producing excises, or the excision amount in bight.

2. method according to claim 1 is characterized in that, the nickel post described in the step (2) adopts sheet nickel to process, and the purity of nickel plate is 95 ~ 100%.