CN102500628A - Method for accurately calibrating widening positions of casting blank during steel rolling - Google Patents
Method for accurately calibrating widening positions of casting blank during steel rolling Download PDFInfo
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- CN102500628A CN102500628A CN2011103582123A CN201110358212A CN102500628A CN 102500628 A CN102500628 A CN 102500628A CN 2011103582123 A CN2011103582123 A CN 2011103582123A CN 201110358212 A CN201110358212 A CN 201110358212A CN 102500628 A CN102500628 A CN 102500628A
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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
Technical field
The invention belongs to technical field of steel rolling, the method for strand broadening position in particularly a kind of accurate demarcation rolling process.Mainly provide the location position of continuous casting billet and the method for selecting for use of demarcating material.
Background technology
In recent years; The demand of high-grade high added value steel products increases day by day; In order to obtain good steel plate mechanical property,, need add composition microalloy elements such as niobium usually when designing, in casting process, be easy to generate transverse corner crack but contain the niobium steel; Produced harmful effect and caused the limit to split defective to rolling the back steel plate easily rolling the back plate surface quality, if can't excision can cause steel plate to be scrapped after cutting edge.To this present situation problem, most steel mills must carry out corner cut to the strand that transverse corner crack occurs and handle, and strand corner cut amount with roll back swarf amount size and control by the maximum that can excise defective usually; But find that in actual production some exists the strand of small size transverse corner crack to handle without corner cut, it is rolling directly to feed intake, and steel plate after rolling is reasonably controlled the side cut amount excise defective.Therefore; Can be through 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; So that can more accurately control strand corner cut amount aborning and roll back swarf amount, thereby improve recovery rate of iron and yield of steel plate, reduce cost.
The problem that exists at present is the crack position and the corresponding relation that rolls position on the steel plate of back that can't accurately demarcate on the strand, and correlation technique is also rarely reported.Once University of Science & Technology, Beijing adopted the nailing mode to demarcate the strand position, observed surface of steel plate steel nail position, the extension behavior of calculating strand through rolling back.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 the method for strand broadening position in a kind of accurate demarcation rolling process.Solved the problem that the crack position on the strand and the corresponding relation that rolls position on the steel plate of back can't accurately be demarcated.
Concrete processing step of the present invention is following:
(1) boring is handled to the continuous casting corners, and the diameter in hole is 2mm～10mm, circular port, and the hole site is portion on the continuous casting billet limit, and between 1mm～100mm, the degree of depth is between 3mm～50mm from limit portion 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) rolling back 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 portion; This measurement length is the measurement result after spreading, and utilizes this result can know the length of the transverse corner crack of certain-length in the expansion of rolling back.Rolling back steel plate needs the side cut amount of certain 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 accurately demarcate the expanding location of continuous casting billet bight each point after rolling;
(2) calibration position after rolling is obvious, comes to light 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 a casting billet surface nickel post calibration maps.
Fig. 2 is for rolling back surface of steel plate nickel post shape appearance figure.
The specific embodiment
Embodiment 1
The method of strand broadening position in a kind of accurate demarcation rolling process according to the present invention; Adopting diameter is that the 5mm drill bit is being holed respectively apart from the position of the strand limit 5mm of portion, 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 is as shown in Figure 1; It is as shown in Figure 2 to roll back surface of steel plate nickel cylindricality looks, is basic point with the center that is out of shape rear end face, measures the distance B of each root nickel post of distortion back from 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 back surface of steel plate nickel post, roll back 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 steel plate nickel post position, back
Table 3 rolls back swarf amount control requirement
| The broadening ratio | Require the control of side cut amount |
| 1.15<=broadening is than<=1.4 | +77mm |
| 1.4＜broadening is than<=1.7 | +82mm |
| 1.7<=broadening is than<=1.9 | +117mm |
| 1.9<=broadening is than<=2.1 | +127mm |
Can know by data analysis in table 2 and the table 3; For the rolling thickness specification is that 20～50mm steel plate and broadening were at 1.29～1.80 o'clock; The strand of transverse corner crack below 15mm can be handled without corner cut, because it rolls the vertical limit of steel plate, back portion transverse corner crack defective in desired side cut weight range.For example when rolling 50mm steel plate and broadening ratio were 1.49, test back steel plate transverse corner crack length was 34mm, and monolateral side cut amount is controlled to be+41mm present first Qin Zhankuan than 1.49 o'clock, and the visible metapedes that rolls is to excise steel plate limit portion transverse corner crack defective.
Claims (2)
1. a method of accurately demarcating strand broadening position in the rolling process is characterized in that, concrete processing step is following:
(1) boring is handled to the continuous casting corners, and the diameter in hole is 2mm～10mm, circular port, and the hole site is portion on the continuous casting billet limit, and between 1mm～100mm, the degree of depth is between 3mm～50mm from limit portion for pitch-row;
(2) with the nickel post as demarcating material, nickel column diameter size equates with bore diameter or less than in the bore diameter 0.5mm;
(3) rolling back 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 portion; This measurement length is the measurement result after spreading, and utilizes this result can know the length of the transverse corner crack of certain-length in the expansion of rolling back; Rolling back steel plate needs the side cut amount of certain 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%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110358212 CN102500628B (en) | 2011-11-13 | 2011-11-13 | Method for accurately calibrating widening positions of casting blank during steel rolling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110358212 CN102500628B (en) | 2011-11-13 | 2011-11-13 | Method for accurately calibrating widening positions of casting blank during steel rolling |
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| CN102500628A true CN102500628A (en) | 2012-06-20 |
| CN102500628B CN102500628B (en) | 2013-10-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104148407A (en) * | 2013-05-15 | 2014-11-19 | 宝山钢铁股份有限公司 | Method for chamfering slabs during rolling of rolling mill |
| CN107064449A (en) * | 2016-12-12 | 2017-08-18 | 方大特钢科技股份有限公司 | Accurate positioning method of the surface defect of bloom succession to stocking |
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| JP2004156117A (en) * | 2002-11-07 | 2004-06-03 | Nippon Light Metal Co Ltd | Aluminum alloy sheet with excellent wear resistance, and its manufacturing method |
| CN201346612Y (en) * | 2009-01-06 | 2009-11-18 | 首钢总公司 | Device for calibrating gun position between continuous casting billet and nail shooting gun |
| CN101992281A (en) * | 2009-08-25 | 2011-03-30 | 鞍钢股份有限公司 | Method and device for measuring thickness of continuous casting blank shell |
| CN102009148A (en) * | 2010-07-15 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Secondary cooling nozzle arrangement method for effectively controlling transverse cracking at corners of slab billets |
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2011
- 2011-11-13 CN CN 201110358212 patent/CN102500628B/en active Active
Patent Citations (4)
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|---|---|---|---|---|
| JP2004156117A (en) * | 2002-11-07 | 2004-06-03 | Nippon Light Metal Co Ltd | Aluminum alloy sheet with excellent wear resistance, and its manufacturing method |
| CN201346612Y (en) * | 2009-01-06 | 2009-11-18 | 首钢总公司 | Device for calibrating gun position between continuous casting billet and nail shooting gun |
| CN101992281A (en) * | 2009-08-25 | 2011-03-30 | 鞍钢股份有限公司 | Method and device for measuring thickness of continuous casting blank shell |
| CN102009148A (en) * | 2010-07-15 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Secondary cooling nozzle arrangement method for effectively controlling transverse cracking at corners of slab billets |
Non-Patent Citations (2)
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| 张旭升等: "应用射钉法测量板坯凝固坯壳的厚度", 《鞍钢技术》, no. 06, 15 December 2005 (2005-12-15), pages 36 - 42 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104148407A (en) * | 2013-05-15 | 2014-11-19 | 宝山钢铁股份有限公司 | Method for chamfering slabs during rolling of rolling mill |
| CN104148407B (en) * | 2013-05-15 | 2016-06-01 | 宝山钢铁股份有限公司 | A kind of plate blank chamfering method during mill milling |
| CN107064449A (en) * | 2016-12-12 | 2017-08-18 | 方大特钢科技股份有限公司 | Accurate positioning method of the surface defect of bloom succession to stocking |
| CN107064449B (en) * | 2016-12-12 | 2019-02-22 | 方大特钢科技股份有限公司 | Surface defect of bloom passes on the accurate positioning method to stocking |
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| CN102500628B (en) | 2013-10-30 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |