CN111822518B - Method for controlling fine line defects of IF steel edge - Google Patents
Method for controlling fine line defects of IF steel edge Download PDFInfo
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- CN111822518B CN111822518B CN202010545626.6A CN202010545626A CN111822518B CN 111822518 B CN111822518 B CN 111822518B CN 202010545626 A CN202010545626 A CN 202010545626A CN 111822518 B CN111822518 B CN 111822518B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
Abstract
The invention discloses a method for controlling fine line defects of IF steel edges, and belongs to the technical field of steel rolling. The method for controlling the thin line defects of the IF steel edge comprises the following steps: when a plurality of IF steel slabs enter a soaking section of the heating furnace, the hearth pressure of the heating furnace is controlled to be 15Pa-50Pa, and a first pair of burners close to a furnace door of the heating furnace is controlled according to the maximum load; when a plurality of IF steel slab steel is tapped, the half-open time of the furnace door of the heating furnace is less than or equal to 20s, and the full-open time of the furnace door of the heating furnace is less than or equal to 50 s. The method for controlling the thin line defect at the edge part of the IF steel improves the corner temperature through the plate blank, compensates the process temperature drop of the rough rolling area, and further eliminates the thin line defect at the edge part.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for controlling fine line defects of IF steel edges.
Background
IF steel is mainly used for deep drawing steel and is generally applied to fields of automobile plates, household electrical plates and the like with higher requirements on forming performance and surface quality.
IF steel requires a low heating temperature to retain precipitates during continuous casting and minimize re-dissolution of the precipitates. During the subsequent hot rolling, the precipitates are continuously coarsened, so that the capability of pinning grain boundaries and dislocations is weakened, and the deep drawing performance of the final finished product is improved. IF steel is taken out of the furnace at low temperature, not only is the stamping performance of the product improved, but also the energy consumption is reduced, and the surface quality of the product is improved.
The thin lines on the edge part are one of the most common surface defects of the hot-rolled IF steel, are generally distributed within the range of 5-30 mm from the edge part and are in thin line distribution along the direction of the strip steel, have stronger inheritance, and are easy to form burrs IF the strip with the defects is continuously cold-rolled.
At present, the commonly adopted measures are that the defects are cut off by trimming before pickling, and the adoption of the method can cause the reduction of the yield of the strip steel and also influence the production efficiency.
Disclosure of Invention
The invention provides a method for controlling fine line defects of IF steel edges, which solves or partially solves the technical problems that the prior art cuts off the fine line defects of the edges on the surface of hot-rolled IF steel by trimming before pickling, so that the yield of strip steel is reduced, and the production efficiency is influenced.
In order to solve the technical problem, the invention provides a method for controlling the fine line defect of the edge part of IF steel, which comprises the following steps: when a plurality of IF steel slabs enter a soaking section of the heating furnace, the hearth pressure of the heating furnace is controlled to be 15Pa-50Pa, and a first pair of burners close to a furnace door of the heating furnace is controlled according to the maximum load; when a plurality of IF steel slab steel is tapped, the half-open time of the furnace door of the heating furnace is less than or equal to 20s, and the full-open time of the furnace door of the heating furnace is less than or equal to 50 s.
Furthermore, the heating time of the IF steel plate blank in the heating furnace is more than or equal to 135 min.
Further, when a plurality of IF steel plate blanks enter a soaking section of the heating furnace, the temperature of a hearth of the soaking section of the heating furnace is higher than that of the IF steel plate blanks by more than 10 ℃.
Further, when a plurality of IF steel plate blanks enter a soaking section of the heating furnace, the temperature rise speed of the IF steel plate blanks is less than or equal to 1.2 ℃/min and less than or equal to 2.5 ℃/min.
Further, the tapping temperature of the IF steel plate blank is 1140-1180 ℃.
Furthermore, the steel loading space between every two adjacent IF steel plate blanks in the plurality of IF steel plate blanks is more than or equal to 150 mm.
Further, when a plurality of IF steel slabs enter the soaking section of the heating furnace, the movable beam of the soaking section of the heating furnace is positioned at the upper position for more than or equal to 1/4 of the total soaking time.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
when a plurality of IF steel slabs enter a soaking section of the heating furnace, the pressure of a hearth of the heating furnace is controlled to be 15Pa-50Pa, and a first pair of burners close to a furnace door of the heating furnace are controlled according to the maximum load, so that cold air outside the furnace can be prevented from being sucked into the furnace from a discharge furnace door to cause the temperature of the surface and the corner of the slab close to the furnace door to be reduced, when a plurality of IF steel slabs are discharged, the half-open time of the furnace door of the heating furnace is less than or equal to 20s, and the full-open time of the furnace door of the heating furnace is less than or equal to 50s, so that the temperature drop of the surface of the slab in the steel discharging process can be reduced, the corner temperature is increased through the slab, the temperature drop in the process of a rough rolling area is compensated, the fine line defect of the edge part is eliminated, the yield of strip steel is ensured, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of a method for controlling fine line defects on an IF steel edge portion according to an embodiment of the invention.
Detailed Description
Referring to fig. 1, the method for controlling fine line defects of the edge of IF steel according to the embodiment of the invention is characterized by comprising the following steps:
when a plurality of IF steel slabs enter a soaking section of the heating furnace, the hearth pressure of the heating furnace is controlled to be 15Pa-50Pa, and a first pair of burners close to a furnace door of the heating furnace is controlled according to the maximum load;
when a plurality of IF steel slab steel is tapped, the half-open time of the furnace door of the heating furnace is less than or equal to 20s, and the full-open time of the furnace door of the heating furnace is less than or equal to 50 s.
According to the specific embodiment of the application, when a plurality of IF steel slabs enter the soaking section of the heating furnace, the hearth pressure of the heating furnace is controlled to be 15Pa-50Pa, and the first pair of burners close to the furnace door of the heating furnace are controlled according to the maximum load, so that cold air outside the furnace can be prevented from being sucked into the furnace from the discharge furnace door, the temperature of the surface and the corner of the slab close to the furnace door can be reduced, when the plurality of IF steel slabs are discharged, the half-open time of the furnace door of the heating furnace is less than or equal to 20s, and the full-open time of the furnace door of the heating furnace is less than or equal to 50 s.
The IF steel with lower heating temperature not only can improve the yield and reduce the fuel consumption, but also can obtain better structure performance. The thin line defect at the edge part is the bottleneck for limiting the reduction of the tapping temperature of IF steel, and the tapping temperature of IF steel is basically controlled to be more than 1180 ℃ at present. From the mechanism analysis of the formation of the thin line defect at the edge part of the IF steel, the defect of edge peeling is mainly caused by the fact that the edge part is rolled in the two-phase area of the edge part during rough rolling or finish rolling due to the fact that the temperature of the edge part is low when a plate blank is rolled in a rough rolling area. At present, the tapping temperature of IF steel produced by conventional hot continuous rolling is more than 1180 ℃, and IF the tapping temperature is continuously reduced, the incidence rate of edge fine lines or warping defects is greatly increased, and the product quality is influenced. According to the method, cold air outside the furnace is prevented from being sucked into the furnace from the discharging furnace door, so that the temperature of the surface and the corner of the plate blank close to the furnace door is reduced, the heating quality of the IF steel plate blank is improved, the temperature drop of the surface of the plate blank in the steel tapping process is reduced, the steel tapping temperature of the IF steel is reduced to 1140 ℃ at the lowest, and the risk of thin lines at the edge part is effectively reduced.
Specifically, the heating time of the IF steel plate blank in the heating furnace is more than or equal to 135min, and the heating quality is ensured to meet the requirements.
Specifically, when a plurality of IF steel slabs enter a soaking section of the heating furnace, the temperature of a hearth of the soaking section of the heating furnace is higher than that of the IF steel slabs by more than 10 ℃, so that the IF steel slabs are always in a temperature rise process, and the surface temperature of the slabs is always higher than the core temperature.
Specifically, when a plurality of IF steel slabs enter a soaking section of the heating furnace, the temperature rise speed of the IF steel slabs is less than or equal to 2.5 ℃/min and 1.2 ℃/min, so that the IF steel slabs are always in a temperature rise state, and meanwhile, the heating quality of the slabs meets the rolling requirement.
Specifically, the tapping temperature of the IF steel slab is 1140-1180 ℃, the tapping temperature of the IF steel is reduced to 1140 ℃ at least, and the fine line defect at the edge can still be avoided.
Specifically, the steel loading space between every two adjacent IF steel slabs in the plurality of IF steel slabs is more than or equal to 150mm, the flow of smoke gas of an upper hearth and a lower hearth of the heating furnace can be improved, and the corner temperature of the slabs can be increased.
Specifically, when a plurality of IF steel slabs enter the soaking section of the heating furnace, the movable beam of the soaking section of the heating furnace is positioned at the upper position for more than or equal to 1/4 of the total soaking time, so that the heating quality of the slabs caused by the excessively high temperature rise speed of the soaking section can be relieved, and the heating quality is ensured to meet the rolling requirement.
In order to more clearly describe the embodiments of the present invention, the following description is made in terms of the method of using the embodiments of the present invention.
The heating time of the batch of IF steel in the heating furnace is 168-175 min; the tapping temperature is 1140-1160 ℃, and the temperature rising speed of the plate blank in the soaking section is 1.2 ℃/min-2.5 ℃/min; after the IF steel enters the soaking section, controlling the temperature of a hearth of the soaking section to be always higher than the temperature of the plate blank by more than 10 ℃; the pressure of the hearth is controlled to be 15Pa-25Pa, and a first pair of burners close to the furnace door is controlled according to the maximum load; in the tapping process, the half-opening time of the furnace door is controlled within 15s, and the full-opening time is controlled within 45 s; the steel loading distance is 180 mm; and after the IF steel enters the soaking section, controlling the movable beam to be at the upper position for 11-14 min, and controlling the total time to be 30-40 min. The heating process parameters are shown in table 1.
TABLE 1
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should 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 of the present invention, which should be covered by the claims of the present invention.
Claims (1)
1. A method for controlling fine line defects of IF steel edges is characterized by comprising the following steps:
when a plurality of IF steel slabs enter a soaking section of the heating furnace, the hearth pressure of the heating furnace is controlled to be 15Pa-50Pa, and a first pair of burners close to a furnace door of the heating furnace is controlled according to the maximum load;
when a plurality of IF steel slab steel is tapped, half-opening time of a furnace door of the heating furnace is less than or equal to 20s, and full-opening time of the furnace door of the heating furnace is less than or equal to 50 s;
when a plurality of IF steel slabs enter a soaking section of the heating furnace, the time that a movable beam of the soaking section of the heating furnace is positioned at the upper position is not less than 1/4 of the total soaking time;
the heating time of the IF steel plate blank in the heating furnace is more than or equal to 135 min;
when a plurality of IF steel plate blanks enter a soaking section of a heating furnace, the temperature of a hearth of the soaking section of the heating furnace is higher than the temperature of the IF steel plate blanks by more than 10 ℃;
when a plurality of IF steel plate blanks enter a soaking section of the heating furnace, the temperature rise speed of the IF steel plate blanks is less than or equal to 1.2 ℃/min and less than or equal to 2.5 ℃/min;
the tapping temperature of the IF steel plate blank is 1140-1180 ℃;
and the steel loading space between every two adjacent IF steel plate blanks in the plurality of IF steel plate blanks is more than or equal to 150 mm.
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| CN202010545626.6A CN111822518B (en) | 2020-06-16 | 2020-06-16 | Method for controlling fine line defects of IF steel edge |
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| JPH06244B2 (en) * | 1984-05-09 | 1994-01-05 | 三菱電機株式会社 | Plate shape control device |
| TWI413554B (en) * | 2011-01-03 | 2013-11-01 | China Steel Corp | Furnace pressure control method |
| CN102699028B (en) * | 2012-02-24 | 2015-03-04 | 宝山钢铁股份有限公司 | Method for eliminating linear edge defects of hot-rolled low-carbon steel |
| CN102641977A (en) * | 2012-05-04 | 2012-08-22 | 北京亿玮坤节能科技有限公司 | Optimizing control energy saving system for steel feeding and discharging of heating furnace |
| CN104567418B (en) * | 2014-12-17 | 2016-08-24 | 秦皇岛首秦金属材料有限公司 | A kind of energy-saving control method of recuperative heater discharging door |
| CN106555051B (en) * | 2015-09-28 | 2018-09-04 | 宝山钢铁股份有限公司 | A kind of slab heating furnace discharging door unlatching sequential control method |
| CN110180895B (en) * | 2019-05-28 | 2021-05-14 | 北京首钢股份有限公司 | Method for solving edge linear defect of hot-rolled high-carbon alloy steel |
| CN110576044B (en) * | 2019-09-05 | 2020-12-15 | 首钢集团有限公司 | Method for eliminating thin lines on hot-rolled edge of 440 MPa-level IF steel |
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