CN115365471A - Method for reducing short billet generation in square billet continuous casting - Google Patents
Method for reducing short billet generation in square billet continuous casting Download PDFInfo
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- CN115365471A CN115365471A CN202211018587.XA CN202211018587A CN115365471A CN 115365471 A CN115365471 A CN 115365471A CN 202211018587 A CN202211018587 A CN 202211018587A CN 115365471 A CN115365471 A CN 115365471A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 65
- 238000005520 cutting process Methods 0.000 claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 230000002159 abnormal effect Effects 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 abstract description 16
- 239000010959 steel Substances 0.000 abstract description 16
- 230000033764 rhythmic process Effects 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/163—Controlling or regulating processes or operations for cutting cast stock
Abstract
The invention belongs to the technical field of steel production, and relates to a method for reducing short billets in square billet continuous casting, which is characterized in that distance calibration is carried out on channels on two sides of a cutting and conveying roller way of a continuous casting machine; when the production is abnormal and the flow is required to be cut off, the length S of the uncut casting blank is controlled according to the following regulation: s = Y + X, wherein the distance from the lower mouth of the crystallizer to the cutting origin position is X; the distance from the cutting origin to the cutting section is Y; and simultaneously, the requirements of S = nL + Z are met, wherein the length of a shrinkage cavity of the casting blank after flow cutoff is Z, the length of the casting blank to be fixed is L, and n is a natural number. The invention controls the time of flow interruption by calculation, controls the generation of short ruler of corresponding continuous casting machine when the production is abnormal and the pouring basket is in tail pouring, reduces the generation of short ruler, reduces the scrap time reduction of steel plant, improves the yield, reduces the production cost, improves the operation rate of casting machine and reduces the accident rate of unplanned casting interruption.
Description
Technical Field
The invention belongs to the technical field of steel production, and relates to a method for reducing short billets in square billet continuous casting.
Background
In the production process of a continuous casting machine, when production abnormality (equipment failure, planned adjustment and the like) occurs in a production process, in order to ensure stable production rhythm of a steel casting interface, a flow interruption operation is adopted in a continuous casting area, the production period is prolonged at the moment, the qualified rate of a casting blank in a fixed length is ensured, the waste reduction of steel making is reduced, the continuous casting area informs a steel casting area to cut off according to a fixed length line of 10 meters, if the production casting flow is positioned at a cutting origin position, the waiting time is 4 minutes, and the non-planned casting interruption accident is caused due to mismatching of the steel casting interface rhythm when the flow cutting method is serious. When the planned casting interruption of the tundish is carried out, the casting blank with less than 10m of multi-flow casting blank can be caused by random flow interruption, if the flow interruption is carried out strictly according to the cutting notification time, the residual molten steel of the tundish is easy to generate and exceeds 170mm.
Disclosure of Invention
In view of the above, the present invention provides a method for reducing short billets in continuous casting of square billets, which aims to solve the problem of the waste of cut blanks due to flow cutoff when the continuous casting of square billets is abnormal.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for reducing the generation of short billets in the continuous casting of square billets comprises the steps of calibrating the distance of channels on two sides of a cutting and conveying roller way of a continuous casting machine; when the production is abnormal and the flow is required to be cut off, the length S of the uncut casting blank is controlled according to the following regulation:
s = Y + X, wherein the distance from the lower opening of the crystallizer to the cutting origin is X; the distance from the cutting origin to the cutting section is Y;
and simultaneously, S = nL + Z is satisfied, wherein the length of a shrinkage cavity of the casting blank after flow cutoff is Z, the length of the casting blank in a fixed length is L, and n is a natural number.
Further, when S ≠ nL + Z, the flow-out was not performed, and the casting was continued until S = nL + Z was satisfied.
Further, the casting blank fixed length L ranges from 6 to 12m.
Further, the distance X from the lower opening of the crystallizer to the cutting origin position ranges from 20 m to 40m.
Further, the casting blank shrinkage cavity length Z after the flow cutting is in the range of 1-3 m.
Further, n ranges from 2 to 7.
Further, when the middle ladle tail is cast, the casting break time is controlled according to the condition that the uncut casting blank length S meets S = nL + Z.
The invention has the beneficial effects that: the invention controls the time of flow interruption by calculation, controls the generation of short ruler of corresponding continuous casting machine when the production is abnormal and the pouring basket is in tail pouring, reduces the generation of short ruler, reduces the scrap time reduction of steel plant, improves the yield, reduces the production cost, improves the operation rate of casting machine and reduces the accident rate of unplanned casting interruption.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
A method for reducing the generation of short billets in the continuous casting of square billets comprises the steps of calibrating the distance of channels on two sides of a cutting and conveying roller way of a continuous casting machine; when the production is abnormal and the flow is required to be cut off, the length S of the uncut casting blank is controlled according to the following regulation:
s = Y + X, wherein the distance from the lower mouth of the crystallizer to the cutting origin position is X; the distance from the cutting origin to the cutting section is Y;
and simultaneously, the requirements of S = nL + Z are met, wherein the length of a shrinkage cavity of the casting blank after flow cutoff is Z, the length of the casting blank to be fixed is L, and n is a natural number.
Wherein the casting blank fixed length L ranges from 6m to 12m. The distance X from the lower opening of the crystallizer to the cutting origin position ranges from 20 m to 40m. The casting blank shrinkage cavity length Z after the flow is cut off ranges from 1 m to 3m. n ranges from 2 to 7.
Meanwhile, when the middle ladle is subjected to tail casting, the casting break time is controlled according to the condition that the uncut casting blank length S meets S = nL + Z.
When S ≠ nL + Z, the flow can not be cut off, and the casting is continued until S = nL + Z is satisfied.
The specific implementation is as follows:
preparation work: and calibrating the distance between the channels on the two sides of the cutting and conveying roller way of the continuous casting machine, namely, the distance between the channels and the cutting original point is 1-12 meters.
1. Control step for producing short ruler blank in abnormal condition cutoff
1. When production abnormity occurs and the furnace rhythm is adjusted by matching the two continuous casting operation areas with cutoff, the two steelmaking operation areas and the two continuous casting operation areas in the production abnormity area transmit abnormal information and estimated processing time to a production operation group of a steel plant 2-3 min before cutoff, and the production operation group is arranged in a coordinated manner.
2. And after the master control worker in the two continuous casting operation areas receives the flow cutoff information notified by the production operation group, the abnormal flow cutoff information is transmitted to the captain within 30 seconds, and the captain coordinates the steel casting area and the cutting area to perform flow cutoff.
3. The cutting area is selected to satisfy the requirement of the fixed-size casting flow and the flow breaking time thereof.
When the length of the uncut cast blank is 32-38 m, namely 0-6m after the cutting origin, the steel casting area is directly informed to stop the flow casting.
When the length of the uncut casting blank is 38-42 m, namely 6-10 m after the cutting origin, the steel casting area can be informed to cut off the flow only when the length of the uncut casting blank is 42-44 m, namely 10-12 m after the cutting origin.
The cutting area is changed into manual operation cutting after the flow is cut off, and each casting blank is guaranteed to meet the requirement of available length.
2. Control step for pouring short billet at tail of tundish
1. And planning to stop casting heat, and increasing the temperature of the second steelmaking operation area out of the station by 5-10 ℃ to ensure the casting temperature of the residual water in the tundish.
2. And after the large ladle stops casting, the main controller transmits the large ladle stop casting information to a steel casting area and a cutting area, and the cutting area pays attention to the length of the uncut casting blank.
3. When the height of the residual water in the tundish is about 400mm, informing the cutting area to start the flow-cutting operation with a fixed length.
When the uncut billet length is between 32 and 38m, i.e. 0-6m after the cutting origin, the steel casting area is informed to interrupt the flow.
When the length of the uncut casting blank is 38-42 m, namely 6-10 m after the cutting origin, the casting area can be informed of the flow breaking only when the length of the uncut casting blank is 42-44.
The cutting section distance from the cutting origin and the casting blank length are controlled as shown in the following table:
after the method is applied, the tundish tail casting can be controlled to generate less than or equal to 2/tundish, the scrap rate of a steel plant is reduced, the yield is improved, the production cost is reduced, the operation rate of a casting machine is improved, and the unplanned casting break accident rate is reduced. After the casting machine adopts the method, the cost of each ton of steel can be reduced by 0.43 yuan.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. A method for reducing short billet generation in square billet continuous casting is characterized in that: distance calibration is carried out on channels on two sides of a cutting and conveying roller way of a continuous casting machine; when the production is abnormal and the flow is required to be cut off, the length S of the uncut casting blank is controlled according to the following regulation:
s = Y + X, wherein the distance from the lower opening of the crystallizer to the cutting origin is X; the distance from the cutting origin to the cutting section is Y;
and simultaneously, S = nL + Z is satisfied, wherein the length of a shrinkage cavity of the casting blank after flow cutoff is Z, the length of the casting blank in a fixed length is L, and n is a natural number.
2. The method for reducing the generation of short billets for continuous casting of billets as claimed in claim 1, wherein: when S ≠ nL + Z, the flow can not be cut off, and the casting is continued until S = nL + Z is satisfied.
3. The method for reducing the generation of short billets in continuous casting of billets as claimed in claim 1, further comprising the steps of: the range of the fixed length L of the casting blank is 6-12 m.
4. The method for reducing the generation of short billets in continuous casting of billets as claimed in claim 1, further comprising the steps of: the distance X from the lower opening of the crystallizer to the cutting origin position ranges from 20 m to 40m.
5. The method for reducing the generation of short billets for continuous casting of billets as claimed in claim 1, wherein: the casting blank shrinkage cavity length Z after the flow is cut off ranges from 1 m to 3m.
6. The method for reducing the generation of short billets for continuous casting of billets as claimed in claim 1, wherein: the casting blank number n ranges from 2 to 7.
7. The method for reducing the generation of short billets for continuous casting of billets as claimed in claim 1, wherein: and when the tail of the tundish is poured, controlling the casting break time when the uncut casting blank length S meets S = nL + Z.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211018587.XA CN115365471A (en) | 2022-08-24 | 2022-08-24 | Method for reducing short billet generation in square billet continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211018587.XA CN115365471A (en) | 2022-08-24 | 2022-08-24 | Method for reducing short billet generation in square billet continuous casting |
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| CN115365471A true CN115365471A (en) | 2022-11-22 |
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| CN202211018587.XA Pending CN115365471A (en) | 2022-08-24 | 2022-08-24 | Method for reducing short billet generation in square billet continuous casting |
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4843531B1 (en) * | 1969-05-13 | 1973-12-19 | ||
| DE2440414A1 (en) * | 1974-05-07 | 1975-11-20 | Florin Stahl Walzwerk | Multi-strand continuous casting - where electronic timer closes tundish nozzles so only last billet cast has short tail-end |
| JPS60196254A (en) * | 1984-03-19 | 1985-10-04 | Sumitomo Metal Ind Ltd | Method for controlling cutting length of continuous casting billet |
| JPS62179858A (en) * | 1986-02-03 | 1987-08-07 | Mitsubishi Heavy Ind Ltd | Cutting length controlling device |
| JPH07214269A (en) * | 1994-02-02 | 1995-08-15 | Nippon Steel Corp | Method for controlling slab casting in continuous casting equipment |
| JPH09253811A (en) * | 1996-03-27 | 1997-09-30 | Kawasaki Steel Corp | Method for cutting continuously cast slab |
| JPH10249504A (en) * | 1997-03-12 | 1998-09-22 | Nippon Steel Corp | Cutting method of continuously cast slab |
| JP2000317583A (en) * | 1999-05-07 | 2000-11-21 | Nippon Steel Corp | Casting control method in billet continuous casting equipment |
| JP2003170247A (en) * | 2001-12-10 | 2003-06-17 | Nippon Steel Corp | Method for stopping molten steel injection into strand in continuous casting |
| CN105014032A (en) * | 2014-04-29 | 2015-11-04 | 宝山钢铁股份有限公司 | Monitoring system and monitoring method for cutting length abnormity of cast blanks |
| CN105618700A (en) * | 2014-11-27 | 2016-06-01 | 上海梅山钢铁股份有限公司 | Method for accurately positioning continuously cast blank outlier caused by gate replacement |
| CN106041011A (en) * | 2016-08-12 | 2016-10-26 | 湖南千盟物联信息技术有限公司 | Implementation method of continuous casting intermediate ladle remaining steel model |
| CN107649657A (en) * | 2017-08-29 | 2018-02-02 | 武钢集团昆明钢铁股份有限公司 | A kind of small billet tundish stops the method poured |
| CN108453226A (en) * | 2017-02-22 | 2018-08-28 | 本钢板材股份有限公司 | A kind of rectangle steel billet back-end crop control method |
| CN110976804A (en) * | 2019-12-11 | 2020-04-10 | 中冶南方连铸技术工程有限责任公司 | Sizing control method of continuous casting billet |
-
2022
- 2022-08-24 CN CN202211018587.XA patent/CN115365471A/en active Pending
Patent Citations (15)
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| JPS60196254A (en) * | 1984-03-19 | 1985-10-04 | Sumitomo Metal Ind Ltd | Method for controlling cutting length of continuous casting billet |
| JPS62179858A (en) * | 1986-02-03 | 1987-08-07 | Mitsubishi Heavy Ind Ltd | Cutting length controlling device |
| JPH07214269A (en) * | 1994-02-02 | 1995-08-15 | Nippon Steel Corp | Method for controlling slab casting in continuous casting equipment |
| JPH09253811A (en) * | 1996-03-27 | 1997-09-30 | Kawasaki Steel Corp | Method for cutting continuously cast slab |
| JPH10249504A (en) * | 1997-03-12 | 1998-09-22 | Nippon Steel Corp | Cutting method of continuously cast slab |
| JP2000317583A (en) * | 1999-05-07 | 2000-11-21 | Nippon Steel Corp | Casting control method in billet continuous casting equipment |
| JP2003170247A (en) * | 2001-12-10 | 2003-06-17 | Nippon Steel Corp | Method for stopping molten steel injection into strand in continuous casting |
| CN105014032A (en) * | 2014-04-29 | 2015-11-04 | 宝山钢铁股份有限公司 | Monitoring system and monitoring method for cutting length abnormity of cast blanks |
| CN105618700A (en) * | 2014-11-27 | 2016-06-01 | 上海梅山钢铁股份有限公司 | Method for accurately positioning continuously cast blank outlier caused by gate replacement |
| CN106041011A (en) * | 2016-08-12 | 2016-10-26 | 湖南千盟物联信息技术有限公司 | Implementation method of continuous casting intermediate ladle remaining steel model |
| CN108453226A (en) * | 2017-02-22 | 2018-08-28 | 本钢板材股份有限公司 | A kind of rectangle steel billet back-end crop control method |
| CN107649657A (en) * | 2017-08-29 | 2018-02-02 | 武钢集团昆明钢铁股份有限公司 | A kind of small billet tundish stops the method poured |
| CN110976804A (en) * | 2019-12-11 | 2020-04-10 | 中冶南方连铸技术工程有限责任公司 | Sizing control method of continuous casting billet |
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