CN111633026A - Control method for reducing linear defects at edge of hot-rolled medium-high carbon alloy steel - Google Patents
Control method for reducing linear defects at edge of hot-rolled medium-high carbon alloy steel Download PDFInfo
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- CN111633026A CN111633026A CN202010435010.3A CN202010435010A CN111633026A CN 111633026 A CN111633026 A CN 111633026A CN 202010435010 A CN202010435010 A CN 202010435010A CN 111633026 A CN111633026 A CN 111633026A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
Abstract
The invention discloses a control method for reducing edge linear defects of hot-rolled medium-high carbon alloy steel, which comprises the following steps: 1) obtaining a right-angle continuous casting blank after conventional smelting and continuous casting; 2) the continuous casting billet is delivered in a direct loading mode, and the charging temperature is more than or equal to 650 ℃; 3) reheating the plate blank; 4) discharging the steel from the furnace, descaling by high-pressure water, and then passing through a sizing machine or performing small side pressure action of the sizing machine; 5) the roughing mills R1 and R2 adopt the pass rolling of '1 + 5'; 6) the descaling pass of rough rolling R2 is 1 pass or 5 passes; 7) reducing width by using an E2 vertical roller, and performing action passes 1, 3 and 5; 8) the thickness of the rough rolling intermediate billet is set to be 50-58 mm, and the outlet temperature of RT2 is more than or equal to 1080 ℃; 9) and (5) carrying out finish rolling on the steel coil by seven racks and then coiling the steel coil. The proportion of the defects in the length direction of the steel coil is reduced to below 2 percent; the position of the defect from the edge is reduced to below 10 mm.
Description
Technical Field
The invention relates to the technical field of hot rolling medium-high carbon alloy steel rolling process control, in particular to a control method for reducing edge linear defects of hot rolling medium-high carbon alloy steel, and belongs to the technical field of hot rolling processes.
Background
The hot-rolled medium-high carbon alloy steel is mainly used for manufacturing wearing parts such as automobile clutch spring diaphragms, saw blades, brake discs and the like, and the hot-rolled raw coil is subjected to slitting, pickling and cold rolling and then is subjected to blanking. Generally, after trimming the edge of the original coil (the maximum trimming amount is 10mm), a downstream user divides the raw material into strips according to the size of a finished product, so that if the client operates conventionally, the defect of more than 10mm from the edge on the surface of the strip steel is inherited to the finished product, and huge potential hazards are caused to the safety of the downstream user; since the increase in the amount of trimming by the customer leads to excessive cutting loss on the one hand and increases the production difficulty and equipment wear of the customer on the other hand, it is necessary to control the edge linear defect to 10mm or less for the production of this type.
The formation mechanism and the control method of the edge linear defect of the hot-rolled strip steel are researched by scholars at home and abroad, and under the condition that the continuous casting billet is free of defects, the main reasons for the defects generated in the hot rolling process are two: firstly, the edges of the continuous casting blank are in a three-dimensional heat transfer state in the rolling process, the temperature is obviously lower than that of other parts, and the edges of the original casting blank are rolled and then are flattened to a certain position away from the edge part to form a black line (or edge crack) due to flattening and widening in the rolling process; and secondly, in the rolling process, edge contact equipment such as a width fixing machine, a vertical roll and the like are scratched due to poor roll shapes and unsatisfactory equipment states. Therefore, for the above two reasons, many researchers at home and abroad propose to solve the problems of certain steel grades, such as the edge linear defects of steel grades of ultra-low carbon IF steel, low carbon low alloy steel, silicon steel and the like, by means of obtuse angle continuous casting, arc width fixing machines, vertical roll hole pattern optimization design and the like. However, practice has proved that the above methods are not suitable for controlling edge linear defects of medium-high carbon steel in hot rolling, and even further worsen the problem of edge linear defects of this type of steel (including increasing the position from the defect edge, the defect depth, etc.).
Through search, the Chinese patent application with the publication number of CN 110180895A discloses a method for solving the edge linear defect of hot-rolled high-carbon alloy steel. The method is extremely conventional, and has no obvious effect on controlling the linear defects of the edge of the hot-rolled medium-high carbon steel, and the inlet temperature of the edge is generally not provided with a measuring instrument, a feedback control system and the operability is not strong.
Further, chinese patent application publication No. CN 107096795 a discloses a manufacturing method for reducing edge defects of hot-rolled strip steel, which reduces the load of the first pass of E1 by 1 to 5mm, optimizes the distribution to the third pass of E1 and the first and third passes of E2, and optimizes the amount of cooling water of the vertical rolls to 70% or less, reduces the edge temperature drop to reduce the edge defects, and in view of the implementation effect: the edge defect judgment amount is only reduced by 60%, the defect reduction degree is not specifically quantified, the steel grade is not specified, and the method is not suitable for controlling the edge linear defects of the hot-rolled medium-high carbon alloy steel.
Aiming at optimizing the corner shape of the continuous casting blank, for example, obtuse-angle continuous casting blanks (Chinese patent application publication No. CN 110405163A) and arc-shaped width fixing machines (Chinese patent publication No. CN204583863U and CN110293136A) are adopted, practice shows that the method can not reduce the generation of linear defects of the edge part and even worsen the defects due to the adoption of a medium-high carbon special alloy component system, so that the distance between the defects and the edge part is increased from 20-22 mm to 30-35 mm.
Therefore, aiming at the problem of edge linear defects of high-carbon steel in hot rolling, a special hot rolling process rule is required to be invented to control the edge linear defects of the steel grade to be less than 10 mm.
Disclosure of Invention
The invention provides a control method for reducing linear defects of the edge of hot-rolled medium-high carbon steel aiming at the problem of linear defects of the edge of hot-rolled medium-high carbon steel, so as to greatly reduce the occurrence probability of the edge defects and control the possible defects to be less than 10mm away from the edge, thereby meeting the use requirements of users.
The invention is realized in such a way that:
a control method for reducing linear defects at the edge of hot-rolled medium-high carbon alloy steel comprises the following steps:
1) obtaining a right-angle continuous casting blank without defects on the surface and edges after conventional smelting and continuous casting;
2) the continuous casting billet is delivered in a direct loading mode, and the charging temperature is more than or equal to 650 ℃;
3) reheating the plate blank, controlling the tapping temperature at 1280-1310 ℃, and keeping the high-temperature section in the furnace for more than or equal to 50 min;
4) discharging the steel from the furnace, descaling by high-pressure water, and then passing through a sizing machine or performing small side pressure action of the sizing machine;
5) the roughing mills R1 and R2 adopt the pass rolling of '1 + 5';
6) the descaling passes of rough rolling R2 are 1 and 5, and the descaling water is closed in other passes;
7) reducing width by using an E2 vertical roller, and performing action passes 1, 3 and 5;
8) the thickness of the rough rolling intermediate billet is set to be 50-58 mm, and the outlet temperature of RT2 is more than or equal to 1080 ℃;
9) and (5) carrying out finish rolling on the steel coil by seven racks and then coiling the steel coil.
The further scheme is as follows:
the difference between the size of the right-angle continuous casting billet and the width of a finished product is controlled to be +20 to +50 mm.
The further scheme is as follows:
the 1+5 pass rolling has the following distribution ratio of pass reduction ratio: 18-20%, not less than 22%, not less than 20%, 15-18%, not more than 12%, not more than 5%.
The further scheme is as follows:
when using the sizing machine, the sizing machine shape is: a right-angled shape; meanwhile, the width of the outlet of the set width fixing machine is the same as the width of the outlet of the set rough rolling.
The further scheme is as follows:
in step 7), utilizing an E2 vertical roll to reduce width, ensuring that the outlet width of R2-5 is the set rough rolling outlet width, and ensuring that the total width reduction quantity of E2 is the total widening quantity of the four-pass flat rolling before R1 and R2, wherein the distribution mode of the width reduction quantity of each pass of E2 is as follows: the proportion of the total width reduction amount is more than or equal to 60 percent, more than or equal to 30 percent and less than or equal to 10 percent, and the total width reduction amount is respectively distributed to E2-1, E2-3 and E2-5 width reduction passes.
The main process principle of the invention is as follows:
1. the right-angle continuous casting billet is mainly used because the research on the metal flow law of the edges discovers that the edges of the right-angle continuous casting billet are closer to the edge part after being rolled relative to the obtuse-angle continuous casting billet. The obtuse angle continuous casting billet is beneficial to improving the heat dissipation problem of the edges, but basically has no benefit for the medium-high carbon steel composition system, and researches show that the positions of the edges on the obtuse angle continuous casting billet after rolling are farther away from the edge part than the positions of the edges on the straight angle continuous casting billet, so that the right angle continuous casting billet is required to be used for production in the invention; the requirement is that the width size of the continuous casting billet is required to be within +20 to +50mm, because the smaller the side pressure of the fixed width is, the smaller the height of a dog bone generated at the edge is, the smaller the width expansion amount in the subsequent flat rolling process is, and the control of the closer of a black line to the edge is facilitated.
2. The continuous casting billet is delivered and produced in a direct loading mode, and the charging temperature is regulated to be more than or equal to 650 ℃. The medium-high carbon alloy steel belongs to cold crack sensitive steel, and slab cracks, particularly edge parts, are easily caused under the condition of improper slow cooling process. By adopting the process, the continuous casting billet can be ensured to be put into a furnace to be reheated under a higher plasticity condition, and the surface and the edge of the continuous casting billet are ensured to be free of defects before the continuous casting billet is taken out of the furnace for rolling.
3. And (3) reheating the plate blank, controlling the tapping temperature at 1280-1310 ℃, and keeping the high-temperature section in the furnace for more than or equal to 50 min. In order to avoid the phenomenon that the edge part dissipates heat quickly in the rough rolling process and enters a two-phase region to cause uneven deformation to generate a folding black line, the tapping temperature is improved as much as possible, the sufficient time of a high-temperature section in a furnace is ensured, and a continuous casting blank with uniform temperature inside and outside is obtained.
4. For the configuration of a width fixing machine hot rolling production line, the width fixing machine is mainly used for width adjustment control of a casting blank, but for the medium-high carbon alloy steel, the temperature difference between the width fixing machine and the edge of a plate blank is extremely large, and meanwhile, the action time of the width fixing machine and the plate blank is long, so that the edge is extremely easy to be supercooled, the edge deformation resistance is large during subsequent rolling, and a black line problem is formed; meanwhile, when the side pressing action of the sizing machine is needed, a right-angle sizing machine is needed, and the width design of the outlet of the sizing machine is the same as the width of a rough rolling finished product.
5. The roughing mills R1 and R2 adopt 1+5 passes for rolling, and the pass reduction ratio distribution ratio is as follows: 18-20%, not less than 22%, not less than 20%, 15-18%, not more than 12%, not more than 5%. Since R1 of a domestic part production line belongs to an irreversible rolling mill and the equipment capacity is limited, rolling is carried out by adopting '1 + 5' pass, and the proportion distribution of the reduction of R1 and R2 according to the rolling mill capacity and the temperature of each pass is mainly because: under high pressure in a high-temperature section, the temperature difference between the edge temperature and other parts is small, and the deformation uniformity is better; meanwhile, the high temperature has a closing effect on the fine edge defects formed in the early rolling process. Therefore, the present invention requires that the reduction be advanced to the high temperature section as much as possible.
6. The descaling passes of rough rolling R2 are 1 and 5, the descaling water is closed in other passes, and under the general condition of hot rolling of medium-high carbon steel, a user can perform subsequent processing and need hydrogen reduction annealing treatment, so that the surface iron scale is not required. Meanwhile, the descaling water action increases the heat dissipation of the edges, so that the temperature of the edges is too low, and therefore, the descaling water is designed to be opened for 1 or 5 passes, and the finishing temperature of rough rolling is increased as much as possible.
7. The method comprises the following steps of utilizing an E2 vertical roll to reduce width, ensuring that the outlet width of R2-5 is the set rough rolling outlet width by acting on passes 1, 3 and 5, ensuring that the total width reduction quantity of E2 is the total widening quantity of the four-pass flat rolling before R1 and R2, wherein the width reduction quantity distribution mode of each pass of E2 is as follows: the proportion of the total width reduction amount is more than or equal to 60 percent, more than or equal to 30 percent and less than or equal to 10 percent, and the total width reduction amount is respectively distributed to the middle parts of the width reduction passes of E2-1, E2-3 and E2-5. Research shows that the black line of the high-steel in the hot rolling is mainly caused by flattening and widening to the surface after the rough rolling process is generated, so that the widening amount of the rough rolling process is required to be completely eaten by three passes acted by E2, and therefore, when the outlet width of the width fixing machine is set to be the same as the outlet width of R2-5 which is the set width of a rough rolling finished product, the widening amounts of the flat rolling of R1, R2-1, R2-2, R2-3 and R2-4 are completely eaten by three passes of E2, so that even if the black line is generated, the black line is closer to the edge part and is controlled to be less than 10 mm. The forward advance of the dispensing of the reduced width amount is to ensure that the final R2-5 is less expanded.
8. The thickness of the rough rolling intermediate billet is set to be 50-58 mm, and the outlet temperature of RT2 is more than or equal to 1080 ℃. Researches show that the edge linear defects of the medium-high carbon steel in hot rolling are mainly caused by flattening and widening in the rolling process, so that the thickness of the intermediate billet is increased as much as possible, and the chances of flattening and widening are reduced. The residual reduction is put into the finish rolling procedure mainly because the finish rolling procedure has the tension action of a loop to promote the almost all metal to flow towards the rolling direction, the spreading probability is extremely low, and the problem of edge black lines generated in the finish rolling process can be avoided. Therefore, the thickness of the intermediate billet is set to be the extreme of the production line, but the intermediate billet also needs to be matched according to the thickness of a finished product and the capacity of a finishing mill; the outlet temperature of RT2 is more than or equal to 1080 ℃, which can ensure the edge part to be kept above 900 ℃. The possibility of the edge entering the two-phase region is reduced, and the uniformity of deformation of the edge and other parts is increased.
Compared with the prior art, the invention has the following advantages: 1) no equipment is required to be added or modified; 2) the proportion of the defects in the length direction of the steel coil is reduced to below 2 percent from about 50 percent before improvement; 3) the distance between the defect and the edge is reduced to below 10mm from the position about 20-30 mm away from the edge before improvement.
Drawings
FIG. 1 is a diagram of the appearance of black line defects at the edge of high carbon steel in hot rolling produced by a conventional process;
FIG. 2 is a graph showing the appearance of black lines at the edge of high carbon steel in hot rolling produced by the process of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The control method for specifically reducing the edge linear defects of the hot-rolled medium-high carbon alloy steel adopted by each embodiment of the invention comprises the following steps:
1) obtaining a right-angle continuous casting blank without defects on the surface and edge by adopting conventional smelting and continuous casting, and controlling the difference value between the size of the casting blank and the width of a finished product to be +20 to +50 mm;
2) the continuous casting billet is delivered in a direct loading mode, and the charging temperature is more than or equal to 650 ℃;
3) reheating the plate blank, controlling the tapping temperature at 1280-1310 ℃, and keeping the high-temperature section in the furnace for more than or equal to 50 min;
4) discharging the steel from the furnace, descaling by high-pressure water, and then passing through a sizing machine or performing small side pressure action of the sizing machine;
5) the roughing mills R1 and R2 adopt 1+5 passes for rolling, and the pass reduction ratio distribution ratio is as follows: 18-20%, not less than 22%, not less than 20%, 15-18%, not more than 12%, not more than 5%;
6) the descaling passes of rough rolling R2 are 1 and 5, and the descaling water is closed in other passes;
7) the E2 vertical roll is used for width reduction, the width of an outlet of R2-5 is ensured to be the width of a set rough rolling outlet in action passes 1, 3 and 5, and the width reduction proportion of each pass of E2 is more than or equal to 60 percent, more than or equal to 30 percent and less than or equal to 10 percent;
8) the thickness of the rough rolling intermediate billet is set to be 50-58 mm, and the outlet temperature of RT2 is more than or equal to 1080 ℃;
9) and (5) carrying out finish rolling on the steel coil by seven racks and then coiling the steel coil.
The values of the relevant process parameters of the examples and comparative examples of the present invention are shown in tables 1, 2 and 3, and the edge defect improvement effect of the examples of the present invention is shown in table 4.
Table 1 list (one) of values of relevant process parameters of each embodiment of the present invention
Table 2 shows the value list (II) of the relevant process parameters of the embodiments of the present invention
Table 3 shows the value list (III) of the relevant process parameters of the embodiments of the present invention
Table 4 list of edge defect improvement effect of each embodiment of the present invention
As can be seen from table 4, when the hot-rolled medium-high carbon alloy steel is produced according to the improved process, the edge defects are significantly controlled, the proportion of the defects in the length direction of the steel coil is reduced from about 50% to less than 2% before the improvement, and the distance between the defects and the edge is reduced from about 20-30 mm from the edge to less than 10mm before the improvement (as shown in fig. 1 and 2). Greatly reduces the cutting loss of the raw materials of the user and improves the yield of the raw seeds.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (5)
1. A control method for reducing linear defects at the edge of hot-rolled medium-high carbon alloy steel is characterized by comprising the following steps:
1) obtaining a right-angle continuous casting blank without defects on the surface and edges after conventional smelting and continuous casting;
2) the continuous casting billet is delivered in a direct loading mode, and the charging temperature is more than or equal to 650 ℃;
3) reheating the plate blank, controlling the tapping temperature at 1280-1310 ℃, and keeping the high-temperature section in the furnace for more than or equal to 50 min;
4) discharging the steel from the furnace, descaling by high-pressure water, and then passing through a sizing machine or performing small side pressure action of the sizing machine;
5) the roughing mills R1 and R2 adopt the pass rolling of '1 + 5';
6) the descaling passes of rough rolling R2 are 1 and 5, and the descaling water is closed in other passes;
7) reducing width by using an E2 vertical roller, and performing action passes 1, 3 and 5;
8) the thickness of the rough rolling intermediate billet is set to be 50-58 mm, and the outlet temperature of RT2 is more than or equal to 1080 ℃;
9) and (5) carrying out finish rolling on the steel coil by seven racks and then coiling the steel coil.
2. The control method for reducing the edge line defects of the hot-rolled medium-high carbon alloy steel according to claim 1, characterized by comprising the following steps:
the difference between the size of the right-angle continuous casting billet and the width of a finished product is controlled to be +20 to +50 mm.
3. The control method for reducing the edge line defects of the hot-rolled medium-high carbon alloy steel according to claim 1, characterized by comprising the following steps:
when using the sizing machine, the sizing machine shape is: a right-angled shape; meanwhile, the width of the outlet of the set width fixing machine is the same as the width of the outlet of the set rough rolling.
4. The control method for reducing the edge line defects of the hot-rolled medium-high carbon alloy steel according to claim 1 or 2, characterized by comprising the following steps:
the 1+5 pass rolling has the following distribution ratio of pass reduction ratio: 18-20%, not less than 22%, not less than 20%, 15-18%, not more than 12%, not more than 5%.
5. The control method for reducing the edge line defects of the hot-rolled medium-high carbon alloy steel according to claim 4, characterized by comprising the following steps:
in step 7), utilizing an E2 vertical roll to reduce width, ensuring that the outlet width of R2-5 is the set rough rolling outlet width, and ensuring that the total width reduction quantity of E2 is the total widening quantity of the four-pass flat rolling before R1 and R2, wherein the distribution mode of the width reduction quantity of each pass of E2 is as follows: the proportion of the total width reduction amount is more than or equal to 60 percent, more than or equal to 30 percent and less than or equal to 10 percent, and the total width reduction amount is respectively distributed to E2-1, E2-3 and E2-5 width reduction passes.
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| CN112692057A (en) * | 2021-01-07 | 2021-04-23 | 唐山燕山钢铁有限公司 | Production method for controlling edge black line of non-oriented silicon steel |
| CN113059002A (en) * | 2021-02-18 | 2021-07-02 | 张家港宏昌钢板有限公司 | Method for eliminating edge peeling of silicon steel and silicon steel |
| CN114669608A (en) * | 2022-03-31 | 2022-06-28 | 湖南华菱涟钢特种新材料有限公司 | Control method for defects of hot-rolled medium-high carbon steel coil edge |
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| CN112692057A (en) * | 2021-01-07 | 2021-04-23 | 唐山燕山钢铁有限公司 | Production method for controlling edge black line of non-oriented silicon steel |
| CN113059002A (en) * | 2021-02-18 | 2021-07-02 | 张家港宏昌钢板有限公司 | Method for eliminating edge peeling of silicon steel and silicon steel |
| CN114669608A (en) * | 2022-03-31 | 2022-06-28 | 湖南华菱涟钢特种新材料有限公司 | Control method for defects of hot-rolled medium-high carbon steel coil edge |
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