CN110293212B - Method for controlling secondary cooling water amount in continuous casting of small square billets under high drawing speed condition - Google Patents
Method for controlling secondary cooling water amount in continuous casting of small square billets under high drawing speed condition Download PDFInfo
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- CN110293212B CN110293212B CN201910677467.2A CN201910677467A CN110293212B CN 110293212 B CN110293212 B CN 110293212B CN 201910677467 A CN201910677467 A CN 201910677467A CN 110293212 B CN110293212 B CN 110293212B
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
Abstract
The invention discloses a method for controlling secondary cooling water quantity in continuous casting of a billet under a high drawing speed condition, belonging to the technical field of continuous casting. The invention can improve the knockout temperature of the billet caster under the condition of high drawing speed, realize that can roll without heating or with little heating, has raised the energy utilization efficiency; the front section of the secondary cooling zone is subjected to super-strong cooling, so that the rapid growth of a casting blank shell is facilitated, and the steel leakage risk under the condition of high drawing speed is reduced; and the temperature of the rear section of the secondary cooling zone is gradually returned, so that the temperature gradient distribution from the surface of the casting blank to the central position is uniform, and the quality control of the rolling process of the rolling mill is facilitated.
Description
Technical Field
The invention belongs to the technical field of continuous casting, and relates to a method for controlling secondary cooling water amount in continuous casting of small square billets under a high casting speed condition.
Background
With the strong promotion of the country to develop circular economy, the requirements of metallurgical enterprises on energy conservation and consumption reduction are higher and higher. The continuous casting blank hot conveying and hot charging and continuous casting and rolling technology has the obvious characteristics of low energy consumption, investment saving, high yield, short production period and the like, thereby becoming the most active research field. Wherein, the hot-feeding and hot-charging and the continuous casting and rolling both take high drawing speed as an important precondition. As the continuous small square billet casting market is huge, the development of a continuous small square billet casting technology with a high drawing speed of 4-8 m/min provides an optimal technical approach for improving the production efficiency of a steel mill and reducing the production cost, and has wide market requirements.
However, under the condition of high drawing speed, the conventional method for controlling the secondary cooling water amount in the continuous casting of small square billets requires that the temperature of the casting billets is uniformly and slowly reduced in the drawing speed direction. The problems and disadvantages of this method are: the temperature loss of the casting blank is large, so that the hot conveying or continuous casting and rolling are not facilitated; the cooling strength of the front section of the secondary cooling zone is not enough, so that the quick growth of a casting blank shell is not facilitated, and the steel leakage risk under the condition of high drawing speed is increased; the temperature difference between the surface and the center of the casting blank is large, which is not beneficial to the quality control of the rolling process of the rolling mill.
Disclosure of Invention
The invention aims to provide a method for controlling secondary cooling water amount in continuous casting of small square billets under a high drawing speed condition, which is used for solving the problems that the temperature loss of cast billets is large in the actual production process of the conventional small square billet continuous casting machine under the high drawing speed condition, and hot feeding or continuous casting and continuous rolling are not facilitated; the cooling strength of the front section of the secondary cooling zone is not enough, so that the quick growth of a casting blank shell is not facilitated, and the steel leakage risk under the condition of high drawing speed is increased; the temperature difference between the surface of the casting blank and the central position is large, which is not beneficial to the quality control of the rolling process of the rolling mill.
The invention is realized by the following technical scheme:
the invention provides a method for controlling secondary cooling water amount in continuous casting of small square billets under the condition of high drawing speed, which comprises the following steps:
controlling the casting speed of the small square billet to be 4-8 m/min, and controlling the casting section to be 120mm multiplied by 120 mm-200 mm multiplied by 200 mm;
dividing the secondary cooling area of the continuous casting of the small square billet into 4-10 cooling subareas, and independently controlling the water quantity of each cooling subarea;
dividing the 4-10 cold partitions into a strong cold partition at the front section and a temperature return partition at the rear section, wherein the number of the cold partitions of the strong cold partition is less than or equal to that of the temperature return partition;
the cooling water flow density of a plurality of cold subareas in a strong cold area is gradually reduced, the cooling water flow density of a plurality of cold subareas in a temperature return area is gradually reduced, and the cooling water flow density of the last cold subarea in the strong cold area is far greater than that of the first cold subarea in the temperature return area.
Further, the cooling range of the forced cooling area is controlled to be 1-4 m, and a water nozzle is adopted for cooling, wherein the density of cooling water flow is 15-50L/(m)2S) and the cooling water pressure is 1.0 to 3.0 MPa.
Further, the casting blank temperature of a plurality of cold subareas in the strong cooling area is controlled to gradually decrease, the temperature cooling speed is less than 250 ℃/m, and the outlet temperature of the last cold subarea in the strong cooling area is 850-950 ℃.
Further, the cooling range of the temperature return area is controlled to be 3-10 m, and the cooling water is cooled by a water nozzle or an air-water nozzle, wherein the density of cooling water flow is less than 10L/(m)2S) cooling water pressure of less than 1.2 MPa.
Further, the casting blank temperature of a plurality of cold subareas in the temperature return area is controlled to gradually rise, the temperature return speed is less than 150 ℃/m, and the outlet temperature of the last cold subarea in the temperature return area is 1000-1100 ℃.
The invention has the advantages that: according to the method for controlling the secondary cooling water amount in continuous casting of the small square billet under the high-casting speed condition, the ejection temperature of a continuous casting machine of the small square billet under the high-casting speed condition can be increased, the rolling can be realized without heating or with less heating, and the energy utilization efficiency is improved; the front section of the secondary cooling zone is subjected to super-strong cooling, so that the rapid growth of a casting blank shell is facilitated, and the steel leakage risk under the condition of high drawing speed is reduced; and the temperature of the rear section of the secondary cooling zone is gradually returned, so that the temperature gradient distribution from the surface of the casting blank to the central position is uniform, and the quality control of the rolling process of the rolling mill is facilitated.
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.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a graph of a conventional secondary cooling water quantity control surface center temperature cooling curve under high pulling rate conditions.
FIG. 2 is a cooling curve of the secondary cooling water mass control surface center temperature under high pulling speed conditions provided by the present invention.
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. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Example 1
A casting blank with the section of 160mm multiplied by 160mm is produced by adopting a full arc continuous casting machine, 7 cold subareas are provided in total, the water quantity of each cold subarea is independently controlled, the produced steel grade is HRB400, and the working drawing speed is 5.0 m/min.
The control method comprises the following steps: the strong cold region is a front section of a secondary cold region, the length of the strong cold region is 2.6m, the strong cold region comprises a cold subarea 1, a cold subarea 2 and a cold subarea 3, the strong cold region is cooled by a water nozzle, and the density of cooling water flow of the cold subareas 1-3 is 26L/(m)2·s)、21L/(m2·s)、 18L/(m2S), cooling water pressure 2.0 MPa; the temperature return area is the rear section of the secondary cooling area, the length of the temperature return area is 8m, the temperature return area comprises a cooling subarea 4, a cooling subarea 5, a cooling subarea 6 and a cooling subarea 7, the cooling subareas are cooled by water nozzles, and the density of cooling water flow of the cooling subareas 4-7 is 8L/(m2 & s), 4L/(m 2 & s) respectively2·s)、2L/(m2·s)、0.5L/(m2S), cooling water pressure 1.0 MPa.
As shown in figures 1 and 2, in the production process adopting the method under the conditions of casting a casting blank with the thickness of 160mm multiplied by 160mm and the working drawing speed of 5.0m/min, the casting blank discharging temperature of the casting blank at the outlet of the secondary cooling area is improved by 100 ℃ compared with the result without adopting the method; the thickness of the casting blank shell at the front section of the secondary cooling zone, particularly in the range of 2m behind the outlet of the crystallizer, is increased by 0.8mm on average; the temperature gradient from the surface of the casting blank at the outlet of the secondary cooling area to the central position is reduced by 80 ℃; the cooling speed of the temperature of the forced cooling area is less than 250 ℃/m, and the temperature return speeds of the temperature return areas are all less than 150 ℃/m; the quality of the continuous casting billet meets the requirements.
Example 2
A casting blank with the section of 160mm multiplied by 160mm is produced by adopting a full arc continuous casting machine, 9 cold subareas are provided, the water quantity of each cold subarea is independently controlled, the produced steel grade is HRB400, and the working drawing speed is 7.0 m/min.
The control method comprises the following steps: the strong cold region is a front section of a secondary cold region, the length of the strong cold region is 3.8m, the strong cold region comprises a cold subarea 1, a cold subarea 2, a cold subarea 3 and a cold subarea 4, the strong cold region is cooled by a water nozzle, and the density of cooling water flow of the cold subareas 1-4 is 42L/(m) respectively2·s)、31L/(m2·s)、 23L/(m2·s)、19L/(m2S), cooling water pressure 2.0 MPa; the temperature return area is the rear section of the secondary cooling area, the length of the temperature return area is 9.5m, the temperature return area comprises a cooling subarea 5, a cooling subarea 6, a cooling subarea 7, a cooling subarea 8 and a cooling subarea 9, the air water nozzles are used for cooling, and the density of cooling water flow of the cooling subareas 5-9 is 9.5L/(m) respectively2·s)、5L/(m2·s)、3L/(m2·s)、2L/(m2·s)、0.8L/(m2S), cooling water pressure 1.0 MPa.
In the production process adopting the method, the casting blank temperature of the casting blank at the outlet of the secondary cooling area is improved by 120 ℃ compared with the result without adopting the method when the casting blank with the thickness of 160mm multiplied by 160mm is cast and the working drawing speed is 7.0 m/min; the thickness of the casting blank shell at the front section of the secondary cooling zone, particularly in the range of 2m behind the outlet of the crystallizer, is increased by 0.85mm on average; the temperature gradient from the surface of the casting blank at the outlet of the secondary cooling area to the central position is reduced by 90 ℃; the cooling speed of the temperature of the forced cooling area is less than 250 ℃/m, and the temperature return speeds of the temperature return areas are all less than 150 ℃/m; the quality of the continuous casting billet meets the requirements.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A method for controlling secondary cooling water amount in continuous casting of small square billets under the condition of high drawing speed is characterized by comprising the following steps:
controlling the casting speed of the small square billet to be 4-8 m/min, and controlling the casting section to be 120mm multiplied by 120 mm-200 mm multiplied by 200 mm;
dividing the secondary cooling area of the continuous casting of the small square billet into 4-10 cooling subareas, and independently controlling the water quantity of each cooling subarea;
dividing the 4-10 cold partitions into a strong cold partition at the front section and a temperature return partition at the rear section, wherein the number of the cold partitions of the strong cold partition is less than or equal to that of the temperature return partition;
controlling the cooling range of the forced cooling area to be 1-4 m, and cooling by adopting a water nozzle, wherein the density of cooling water flow is 15-50L/(m 2 & s), and the pressure of cooling water is 1.0-3.0 MPa;
controlling the cooling range of the temperature return area to be 3-10 m, and cooling by adopting a water nozzle or an air-water nozzle, wherein the density of cooling water flow is less than 10L/(m2 & s), and the cooling water pressure is less than 1.2 MPa;
the cooling water flow density of a plurality of cold subareas in a strong cold area is gradually reduced, the cooling water flow density of a plurality of cold subareas in a temperature return area is gradually reduced, and the cooling water flow density of the last cold subarea in the strong cold area is far greater than that of the first cold subarea in the temperature return area.
2. The method for controlling the secondary cooling water amount in continuous casting of billets under the high drawing speed condition according to claim 1, wherein the casting blank temperature of a plurality of cold partitions in the strong cooling area is controlled to be gradually reduced, the temperature cooling speed is less than 250 ℃/m, and the outlet temperature of the last cold partition in the strong cooling area is 850-950 ℃.
3. The method for controlling the secondary cooling water amount in continuous casting of billets under the high casting speed condition according to claim 1, wherein the casting blank temperature of a plurality of cold partitions in the temperature return area is controlled to gradually rise, the temperature return speed is less than 150 ℃/m, and the outlet temperature of the last cold partition in the temperature return area is 1000-1100 ℃.
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| CN110802208B (en) * | 2019-11-13 | 2021-06-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for adjusting water yield of continuous casting production in high-latitude area |
| CN111859788B (en) * | 2020-07-07 | 2023-11-10 | 鞍钢股份有限公司 | Method for uniformly predicting and evaluating temperature of secondary cooling zone based on billet continuous casting |
| CN111992686B (en) * | 2020-09-03 | 2021-12-17 | 福建三钢闽光股份有限公司 | Aerial fog full-water combined cooling high-carbon steel continuous casting production method |
| CN113198996B (en) * | 2021-04-30 | 2022-04-05 | 北京科技大学 | Secondary cooling water amount configuration method based on continuous casting billet surface temperature return control |
| CN114798736A (en) * | 2022-04-27 | 2022-07-29 | 日照宝华新材料有限公司 | Method for producing thin-specification patterned steel plate by thin slab continuous casting and rolling process |
| CN115555531B (en) * | 2022-12-02 | 2023-03-07 | 北京科技大学 | Gas cooling device and process for square billet continuous casting secondary cooling area |
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| FI780346A (en) * | 1978-02-03 | 1979-08-04 | Ovako Oy | OSYMMETRISK SEKUNDAERKYLNING |
| CH646352A5 (en) * | 1980-01-11 | 1984-11-30 | Vnii Avtom Chernoi Metallurg | Apparatus for regulating the secondary cooling in a continuous-casting installation with batchwise smelt supply via a tundish |
| JPS6012266A (en) * | 1983-07-01 | 1985-01-22 | Nippon Steel Corp | Continuous casting method |
| SU1447554A1 (en) * | 1987-05-05 | 1988-12-30 | Череповецкий Металлургический Комбинат Им.50-Летия Ссср | Method and apparatus for controlling the process of crystallization of ingot in the secondary cooling zone of continuous casting machine of billets |
| CN100579680C (en) * | 2007-06-18 | 2010-01-13 | 首钢总公司 | Method for producing high-intensity fine rolling screwed reinforcement |
| CN106345977A (en) * | 2016-11-29 | 2017-01-25 | 中冶赛迪工程技术股份有限公司 | Secondary cooling method and device of high-speed small square billet or small round billet continuous casting machine |
| CN106513614B (en) * | 2016-12-06 | 2018-09-11 | 中冶连铸技术工程有限责任公司 | The method for carrying out the production of all steel kind strand using billet caster |
| CN106735025A (en) * | 2017-02-09 | 2017-05-31 | 首钢总公司 | A kind of control method of prestress steel continuous small-billet casting center segregation |
| CN107262690B (en) * | 2017-06-29 | 2019-04-30 | 中冶连铸技术工程有限责任公司 | A kind of two cold water spray equipment for the high pulling rate production of billet caster |
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| CN109290540A (en) * | 2018-10-26 | 2019-02-01 | 中冶连铸技术工程有限责任公司 | Continuous small-billet casting casting-rolling technology method and apparatus |
| CN109465412A (en) * | 2018-12-28 | 2019-03-15 | 首钢集团有限公司 | A kind of small billet high casting speed continuous casting method of long material Direct Rolling |
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