CN114535294A - Method for producing hot-rolled strip steel with thickness of 1.0mm by CSP production line - Google Patents
Method for producing hot-rolled strip steel with thickness of 1.0mm by CSP production line Download PDFInfo
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- CN114535294A CN114535294A CN202210248686.0A CN202210248686A CN114535294A CN 114535294 A CN114535294 A CN 114535294A CN 202210248686 A CN202210248686 A CN 202210248686A CN 114535294 A CN114535294 A CN 114535294A
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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
- 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
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Abstract
A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps: casting into a blank after smelting; heating a casting blank; carrying out secondary descaling on the casting blank; carrying out seven-pass rolling; laminar cooling to coiling temperature; and (4) coiling. The invention solves the technical problems of poor threading stability, large plate shape control difficulty and the like of the short-process rolling of the 1.0mm hot-rolled ultrathin strip steel, realizes the stable large-scale production of the short-process rolling of the 1.0mm hot-rolled ultrathin strip steel, has the characteristics of thin specification, excellent plate shape and excellent coil shape, achieves the purpose of replacing cold-rolled products in batches, and meets the requirements of green and light steel manufacturing.
Description
Technical Field
The invention relates to a production method of strip steel, in particular to a method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line.
Background
The traditional ultrathin strip steel, particularly products with the thickness of less than 2.0mm, adopts the manufacturing process of hot rolling and cold rolling, and has long process flow, high energy consumption and high manufacturing cost. With the development of the steel industry, the short-flow process makes great progress, and the short-flow process can be used for directly rolling and producing hot-rolled products with the thinnest thickness of 1.0-1.05 mm, and replacing cold-rolled products with the same strength and the same thickness to realize 'hot-cold replacement'. The manufacturing process can be greatly shortened, the energy-saving and emission-reducing effects are obvious, and the method conforms to the development direction of the steel industry, such as simplicity, high efficiency and green ecology.
At present, when a short-flow process is adopted to produce thin hot-rolled ultrathin strip steel, the rolling speed and the rolling load are large, the threading stability and the process plate shape control difficulty are large, and the technical problem that a hot continuous rolling production line rolls 1.0mm in a single block to become the industry exists. Therefore, the realization of batch and stable rolling of the 1.0mm ultra-thin hot rolled plate strip steel is one of the technical difficulties to be solved in the field.
Through retrieval, the method is a document named as a method for stably rolling niobium-added wide strip steel thin materials, and mainly comprises the steps of 1) soaking for 35-40 minutes, and controlling the tapping temperature difference between heating furnaces to be +/-30 ℃; 2) the final pass of rough rolling is swung and cooled, so that the rough rolling temperature RDT is controlled to be in the lower limit of the target range; finish rolling F4 and the subsequent cooling water between frames is not added, and the FDT is controlled at 875 ℃ to 890 ℃ by adopting a method of maintaining the speed of a finish rolling machine; 3) the lateral bending of the head of the rough rolling incoming material is controlled within +/-30 mm; 4) and (3) controlling the convexity of a finished product: the convexity of the upstream frame is controlled to be 50-60 mu m. The beneficial effects of the invention are: a method for stably rolling niobium-added wide strip steel sheets is used for producing niobium-added wide strip steel with the thickness less than or equal to 3.0mm, the rolling success rate of the niobium-added wide strip steel is improved, the occurrence rate of production accidents such as forward folding, tail flicking and the like is reduced, the operation rate of a rolling mill is improved, the yield is improved, the profit is increased, and the related process related to the production of hot rolled strip steel with the thickness of 1.0mm on a CSP production line is not involved.
Through retrieval, the document named as 'a method for improving the rolling stability of container thin materials' is mainly characterized in that a rolling plan is reasonably configured, technological parameters are optimized, technological procedures are improved, a temperature control is taken as a main line, a series of effective technical measures such as strictly controlling a heating system, a rough rolling production process, a finish rolling production process and the like are adopted, the rolling stability of the container thin materials is improved, head forward folding, tail throwing and steel clamping accidents of strip steel are reduced, the phenomena of damage to rollers and wax hanging of the rollers and the deviation and loop fluctuation of the strip steel in the rolling process are avoided, the shape and the surface quality of the container thin materials are improved, and the rolling success rate is up to 99%. Meanwhile, the accident handling workload is reduced, the operation rate and the product yield of the rolling mill are improved, the contract execution rate is ensured, and the enterprise credit and economic benefit are improved. The control of producing hot rolled strip steel with the thickness of 1.0mm by a CSP production line cannot be adopted due to poor pertinence.
The document is named as a thin material rolling method of high-carbon steel tandem rolling billets through retrieval, and mainly refers to the processes of billet pretreatment, heating and rolling, straightening and cooling after rolling; the invention realizes the smooth production of the high-carbon steel extreme thin-specification steel plate, prevents the phenomena of welding, cracking and the like during the rolling of the high-carbon steel pack rolling blank by adjusting the heating and rolling process, realizes the strict control of the plate shape and the thickness precision, and does not aim at the relevant parameters of the specific steel type and the thin-specification rolling process.
Through retrieval, a document named as a method for producing thin strip steel with good surface quality based on a CSP process mentions that the method comprises the working procedures of desulfurization, converter, argon blowing, RH refining, continuous casting, soaking pit furnace, finish rolling, laminar cooling and coiling, and is characterized in that: the molten steel after RH refining comprises the following components in percentage by weight: 0.045-0.07%, Si: 0.02 to 0.04%, Mn: 0.5-0.8%, P: < 0.020%, S: < 0.01%, legal status a: 0.015 to 0.05%, Ti: 0.03-0.05%, and the balance of iron-based thin-specification strip steel with good surface quality produced by the CSP process, the method eliminates the defects of dotted scale and obviously improves the surface quality of products, and the method cannot be adopted due to poor pertinence for controlling the hot-rolled strip steel with the thickness of 1.0mm produced by the CSP process.
Through retrieval, the document named as 'a control method for eliminating the tail transverse vibration line offset of short-process thin strip steel' refers to eliminating the tail transverse vibration line offset of the short-process thin strip steel through six aspects of measuring the centering control of a rolling mill guide plate, the control of loop tail falling, the control of rolling force and bending roll force, the control of water system time sequence, the control of working roll rolling tonnage and the control of slab temperature by a rolling center line; the invention solves the problem of offset of transverse vibration lines at the tail part of the CSP ultrathin material, solves the technical problems of tail drifting, unstable production and the like caused by difficult control of the shape of the tail part of the ultrathin strip steel rolled in a short process, and realizes the purpose of high-quality and high-stability large-scale production of the ultrathin hot rolled strip steel rolled in the short process. The control of hot rolled strip steel with the thickness of 1.0mm produced by the CSP process cannot be adopted due to poor pertinence.
Through search, the document entitled "a control method for eliminating the flying and warping of short-process ultrathin strip steel" mainly refers to conditions and parameters for controlling the rolling of working rolls of a rolling mill, the threading speed of the strip steel, the dust removal water time sequence, the micro-bilateral wave rolling, the uneven abrasion of the working rolls and the rolling reduction.
The problems of producing the 1.0mm hot-rolled ultrathin strip steel on the CSP production line are not involved, and the thickness of the strip steel is more than 1.0 mm.
Disclosure of Invention
The invention aims to overcome the technical problems of poor threading stability, large plate shape control difficulty and the like of the hot-rolled ultrathin strip steel with the thickness of 1.0mm in the prior art, and provides a method for producing the hot-rolled ultrathin strip steel with the thickness of 1.0mm by adopting a CSP production line, which can stably produce the hot-rolled ultrathin strip steel with the thickness of 1.0mm on the CSP production line and has excellent plate shape and roll shape.
The measures for realizing the aim are as follows:
a method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, pouring into a blank, and controlling the thickness of the casting blank to be 50-56 mm in the process of pouring into the blank by adopting a liquid core reduction mode;
2) heating the casting blank, wherein the heating temperature is controlled to be 1200-1220 ℃, and the heating time is not less than 30 min;
3) carrying out secondary descaling on the casting blank: controlling the pressure of the first-time descaling water to be not lower than 180bar, and controlling the pressure of the second-time descaling water to be not lower than 200 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 55-60 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading speed is controlled to be 9.5-9.8 m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 14-15 m/s;
in the rolling tension control stage:
controlling the tension between the racks in the last three passes, wherein on the basis of the existing rolling reduction rate, the reverse three passes are increased by 19.5-20.5%, the reverse two passes are increased by 14.5-15.5%, and the reverse one pass is increased by 14.5-15.5%;
in the plate type control stage, controlling the upper water spraying quantity of the cooling water of the roll gap of the rack from the first to the fourth times to be 90 percent of the rated water quantity, and controlling the lower water spraying quantity to be 110 percent of the rated water quantity;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line not to exceed 3 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be less than or equal to 20 mm; controlling the dynamic thickness action amount of the last pass to be less than or equal to 0.2 mm; controlling the convexity of the finished strip steel product to be 45-55 um; controlling the reduction rate of the last pass to be 8-9%;
the finishing temperature is controlled to be 860-890 ℃;
5) cooling the laminar flow to a coiling temperature, starting the laminar flow cooling after the laminar flow passes from the head of the strip steel to a length of not more than 5m, cooling the nozzles at the upper part in a way of closing one nozzle by one nozzle, and closing all the nozzles at the lower part;
6) coiling, controlling the coiling temperature to be 630-680 ℃ and the throwing tension to be 35-36N/mm2And held until the end of the winding.
Preferably: in the rolling tension control stage:
controlling the tension between the racks of the last three passes, increasing the tension by 19.8-20.2% in the last three passes on the basis of the existing rolling reduction rate,
the two-pass increase is 14.5-15.1%, and the one-pass increase is 14.5-15.2%.
Preferably: controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line not to exceed 2.7 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be less than or equal to 17 mm; controlling the dynamic thickness action amount of the last pass to be less than or equal to 0.15 mm; controlling the convexity of the finished strip steel product to be 45-51 um; the finishing temperature is controlled to be 860-883 ℃.
Preferably: the coiling temperature is 630-673 ℃.
Action and mechanism of the main process in the invention
The heating temperature is controlled to be 1200-1220 ℃, because the discharging temperature of the plate blank is too high, the iron sheet on the surface with serious oxidation burning loss is difficult to remove, the quality risk is large, and the unit consumption of coal gas is high and uneconomical; the deformation resistance of steel is increased due to the fact that the discharging temperature of the plate blank is low, the irregular deformation of metal is aggravated due to the fact that the fluidity of the metal is poor, and even a large amount of waste rolling, steel clamping and tail flicking phenomena occur, so that the discharging temperature of the plate blank needs to be groped according to actual conditions.
The secondary high-pressure dephosphorization is carried out in the invention, because the temperature drop of the surface of the slab is smaller as the dephosphorization pressure is lower and the fluidity of the metal is better on the premise of removing the iron oxide scales on the surface of the slab cleanly, the stable rolling is facilitated. The distances from the header pipe nozzles to the surface of the sheet billet in the first and second passes of descaling are respectively 55-60 mm, and the distances from the header pipe nozzles to the surface of the sheet billet are too small, so that the fan-shaped surface sprayed by the nozzles cannot completely cover the whole surface of the sheet billet, and the local descaling is not caused; too large a distance from the manifold nozzle to the surface of the thin slab weakens the impact force of the descaling water on the surface of the thin slab, thereby affecting the descaling effect.
The threading speed is controlled to be 9.5-9.8 m/s, because the head of the strip steel is irregular, the higher the strip steel passing speed is, the more easily the strip steel is bounced, warped and the like on a channel line to cause scrap steel.
According to the invention, on the basis of the existing rolling reduction rate, the rolling tension is controlled to increase by 19.5-20.5% in the third pass, by 14.5-15.5% in the second pass and by 14.5-15.5% in the first pass, and the rolling thickness and the convexity of the rolled piece are mainly controlled in the first to fourth passes of the front section of rolling frame, and the plate shape of the rolled piece is mainly controlled in the fifth to seventh passes of the rear section of rolling frame, so that the stability of the plate shape can be controlled by properly increasing the tension between the frames.
In the plate shape control stage, the upper water spraying amount of the cooling water of the roll gaps of the racks in the first to fourth passes is controlled to be 90 percent of the rated water amount, the lower water spraying amount is controlled to be 110 percent of the rated water amount, and the total water amount is kept unchanged, so that the upper surface and the lower surface of the strip steel are cooled unevenly due to long residence time of the water on the upper surface of the strip steel, the temperature of the lower surface is higher, the extension amount is larger during rolling, namely the upper surface and the lower surface of the strip steel are asymmetrically bitten into, and then the warping occurs (the phenomenon starts from the front section of rack but is really shown on the rear section of rack, so the warping occurs in the sixth and seventh passes more), so that the upper water spraying amount is reduced, the lower water spraying amount is increased, and the total water amount is kept unchanged; the deviation between the center of each side guide plate and the rolling center line in finish rolling is controlled because the finish rolling guide and guard device comprises guide plates of racks in first to seventh passes, the guide plates of the rolling mill are arranged at the inlet side of each rolling mill rack and are positioned between an upper housing window and a lower housing window of the rolling center line, and the strip is guided into a roll gap and under the guiding action of the tail part of the strip steel, wherein the guide plates are fixed by 1 side guide plate in the first pass and the guide plates with adjustable widths by 6 side guide plates in the second to seventh passes. In the rolling process of the finish rolling guide and guard device, the strip steel is guided in three stages of strip threading, stable rolling and steel throwing. The deviation of the head and the tail of the strip steel is represented by poor wedge shape on a finished product, so the centering performance of the finish rolling guide and guard device is particularly important in the process of controlling the stable rolling of the strip steel. The roll shifting positions of the F5, F6 and F7 frames are controlled because the roll shifting positions of the upper steel and the lower steel are greatly changed, so that the roll gap shape is greatly changed, the bad plate shape phenomenon caused by edge waves or middle waves is easily generated, and scrap steel is generated if the bad plate shape phenomenon is serious. The dynamic thickness of the seventh pass is controlled because when the dynamic thickness is too large after the strip steel is threaded, the roll gaps of the frames need to be dynamically adjusted, and the frame steel pulling, steel piling and rolling breakage accidents caused by mismatching of second flow of the frames are easily caused in the adjusting process.
The convexity of the finished product is controlled to be 45-55 um, because the convexity of the finished product is too large, the double-edge wave defect is caused, and the convexity of the finished product is too small, the single-edge wave defect is caused, so that the rolling is unstable.
The rolling reduction of the seventh-pass rack is controlled to be 8-9%, because the rolling reduction is too small, the roll bending force cannot compensate the change of the rolling force, and the strip steel is easy to generate double-side wave shape; the reduction rate is too large, which is not beneficial to plate shape control and is easy to cause plate-through rolling damage and even steel scrap accidents.
The reason why the finishing temperature is controlled is that the finishing temperature is lower than 860 ℃, mixed crystals of austenite and ferrite of strip steel can be caused to cause poor processing and mechanical properties of steel, and the frame steel drawing and thinning defects can be caused in the softer rolling process of the steel with the finishing temperature higher than 890 ℃.
The coiling temperature is controlled to be 630-680 ℃, the temperature is preferably 630-673 ℃, the reason is that the head turning defect is easy to occur on a laminar flow roller bed due to the fact that a 1.0mm hot rolling film is extremely thin, and the turning of the head of the strip steel can be better controlled by adopting a sparse upper spraying and lower spraying closed cooling mode for laminar flow cooling. The coiling temperature is controlled because the deformation resistance of the steel with too low coiling temperature is slightly higher and the plasticity of the steel with too high coiling temperature is slightly better and the deformation resistance is slightly lower, so that the service performance of the steel is influenced. The coiling tension is controlled because the excessive tail tension in the coiling process easily generates overflow edges, and the excessive tail tension can cause coil loosening, so that the coiling tension is determined on the basis of comprehensive consideration, and the problem of poor coil shape in the coiling process of the 1.0mm ultrathin material can be effectively solved.
Compared with the prior art, the invention solves the technical problems of poor threading stability, large plate shape control difficulty and the like of the short-process rolling of the 1.0mm hot-rolled ultrathin strip steel, realizes the stable large-scale production of the short-process rolling of the 1.0mm hot-rolled ultrathin strip steel, has the characteristics of thin specification, excellent plate shape and excellent coil shape, achieves the purpose of replacing cold-rolled products in batches, and meets the requirements of greenness and light weight of steel manufacturing.
Detailed Description
The present invention is described in detail below:
example 1
A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, then pouring into a blank, wherein the thickness of the casting blank is controlled to be 54mm by adopting a liquid core reduction mode in the step of pouring into the blank;
2) heating the casting blank, wherein the heating temperature is controlled at 1203 ℃, and the heating time is 31 min;
3) carrying out secondary descaling on the casting blank: controlling the pressure of the first-time descaling water at 181bar and the pressure of the second-time descaling water at 206 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 55 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading thickness is 1.05 mm; the threading speed is 9.5m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 14.1 m/s;
in the rolling tension control stage:
controlling the tension between the racks of the last three passes, wherein on the basis of the existing rolling reduction rate, the reverse three passes are increased by 19.6 percent, the reverse two passes are increased by 14.5 percent, and the reverse one pass is increased by 14.7 percent;
in the plate type control stage, the upper water spraying amount of the cooling water of the roller gap of the rack in the first to fourth passes is controlled to be 90% of the rated water amount, and the lower water spraying amount is controlled to be 110% of the rated water amount;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line to be 2.8 mm; controlling the position difference of the roller shifting of the rack of the last three passes to be 19.6 mm; controlling the dynamic thickness action amount of the last pass to be 0.187 mm; the convexity of the finished strip steel product is controlled to be 49 um; the reduction rate of the last pass is controlled to be 8.2 percent;
the finishing temperature is controlled at 863 ℃;
5) cooling the laminar flow to a coiling temperature, starting the laminar flow cooling after the length from the head of the strip steel to 4.5m passes, cooling the nozzles at the upper part in a way of closing one nozzle by one nozzle, and closing all the nozzles at the lower part;
6) coiling is carried out, the coiling temperature is controlled at 636 ℃, and the throwing tension is controlled at 35.2N/mm2And held until the end of the winding.
Through detection and statistics, the plate is smooth and stable, and the qualified rate of finished products is 100%.
Example 2
A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, and then pouring into a blank, wherein the thickness of the casting blank is controlled to be 52mm in the process of pouring into the blank by adopting a liquid core reduction mode;
2) heating the casting blank, wherein the heating temperature is controlled to be 1210 ℃, and the heating time is 33 min;
3) carrying out secondary descaling on the casting blank: the first time of descaling water pressure is controlled at 185bar, and the second time of descaling water pressure is controlled at 208 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 57 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading thickness is 1.05 mm; the threading speed is 9.6m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 14.3 m/s;
in the rolling tension control stage:
controlling the tension between the racks of the last three passes, wherein on the basis of the existing rolling reduction rate, the reverse three passes are increased by 20 percent, the reverse two passes are increased by 15 percent, and the reverse one pass is increased by 15 percent;
in the plate type control stage, the upper water spraying amount of the cooling water of the roller gap of the rack in the first to fourth passes is controlled to be 90% of the rated water amount, and the lower water spraying amount is controlled to be 110% of the rated water amount;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line to be 2.5 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be 16 mm; controlling the dynamic thickness action amount of the last pass to be 0.145 mm; the convexity of the finished strip steel product is controlled to be 50 um; the reduction rate of the last pass is controlled to be 8.5 percent;
the finishing temperature is controlled to 872 ℃;
5) cooling the laminar flow to a coiling temperature, starting the laminar flow cooling after the length from the head of the strip steel to 4.2m passes, cooling the nozzles at the upper part in a way of closing one nozzle by one nozzle, and closing all the nozzles at the lower part;
6) coiling is carried out, the coiling temperature is controlled at 641 ℃, and the throwing tension is controlled at 35.6N/mm2And held until the end of the winding.
Through detection and statistics, the plate passing through of the embodiment is stable, and the qualified rate of finished products is 100%.
Example 3
A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, and then pouring into a blank, wherein the thickness of the casting blank is controlled to be 55mm in the step of pouring into the blank by adopting a liquid core reduction mode;
2) heating the casting blank, wherein the heating temperature is controlled to be 1212 ℃, and the heating time is 35 min;
3) carrying out secondary descaling on the casting blank: the first descaling water pressure is controlled at 189bar, and the second descaling water pressure is controlled at 209 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 60 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading thickness is 1.05 mm; the threading speed is 9.8m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 14.9 m/s;
in the rolling tension control stage:
controlling the tension between the racks of the last three passes, wherein on the basis of the existing rolling reduction rate, the reverse three passes are increased by 20.4 percent, the reverse two passes are increased by 15.3 percent, and the reverse one pass is increased by 15.2 percent;
in the plate type control stage, the upper water spraying amount of the cooling water of the roller gap of the rack in the first to fourth passes is controlled to be 90% of the rated water amount, and the lower water spraying amount is controlled to be 110% of the rated water amount;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line to be 2.3 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be 14 mm; controlling the dynamic thickness action amount of the last pass to be 0.137 mm; the convexity of the finished strip steel product is controlled to be 47 um; the reduction rate of the last pass is controlled to be 8.8 percent;
the finishing temperature is controlled at 882 ℃;
5) laminar cooling is carried out to the coiling temperature, laminar cooling is started after the length from the head of the strip steel to 3.9m passes, nozzles at the upper part of the cooling are cooled in a mode of closing one by one, and nozzles at the lower part of the cooling are all closed;
6) coiling is carried out, the coiling temperature is controlled to be 659 ℃, and the throwing tension is controlled to be 35.9N/mm2And held until the end of the winding.
Through detection and statistics, the plate is smooth and stable, and the qualified rate of finished products is 100%.
Example 4
A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, and then pouring into a blank, wherein the thickness of the casting blank is controlled to be 56mm in the process of pouring into the blank by adopting a liquid core reduction mode;
2) heating the casting blank, wherein the heating temperature is controlled to 1215 ℃, and the heating time is 36 min;
3) carrying out secondary descaling on the casting blank: the first-time descaling water pressure is controlled at 190bar, and the second-time descaling water pressure is controlled at 211 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 57 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading thickness is 1.05 mm; the threading speed is 9.75m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 14.8 m/s;
in the rolling tension control stage:
controlling the tension between the racks of the last three passes, wherein on the basis of the existing rolling reduction rate, the reverse three passes are increased by 20.1 percent, the reverse two passes are increased by 15.5 percent, and the reverse one pass is increased by 15.5 percent;
in the plate type control stage, the upper water spraying amount of the cooling water of the roller gap of the rack in the first to fourth passes is controlled to be 90% of the rated water amount, and the lower water spraying amount is controlled to be 110% of the rated water amount;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line to be 2.1 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be 15 mm; controlling the dynamic thickness action amount of the last pass to be 0.145 mm; the convexity of the finished strip steel product is controlled to be 45 um; the reduction rate of the last pass is controlled to be 8.2 percent;
the finishing temperature is controlled to be 876 ℃;
5) cooling the laminar flow to a coiling temperature, starting the laminar flow cooling after the length from the head of the strip steel to 3.5m passes, cooling the nozzles at the upper part in a way of closing one nozzle by one nozzle, and closing all the nozzles at the lower part;
6) coiling is carried out, the coiling temperature is controlled at 665 ℃, and the throwing tension is controlled at 35.3N/mm2And held until the end of the winding.
Through detection and statistics, the plate is smooth and stable, and the qualified rate of finished products is 100%.
Example 5
A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, and then pouring into a blank, wherein the thickness of the casting blank is controlled to be 50mm in the process of pouring into the blank by adopting a liquid core reduction mode;
2) heating the casting blank, wherein the heating temperature is controlled to be 1201 ℃, and the heating time is 31 min;
3) carrying out secondary descaling on the casting blank: controlling the pressure of the first descaling water at 181bar and the pressure of the second descaling water at 202 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 55 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading thickness is 1.05 mm; the threading speed is 9.8m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 15 m/s;
in the rolling tension control stage:
controlling the tension between the racks of the last three passes, wherein on the basis of the existing rolling reduction rate, the reverse three passes are increased by 19.5 percent, the reverse two passes are increased by 14.5 percent, and the reverse one pass is increased by 14.5 percent;
in the plate type control stage, the upper water spraying amount of the cooling water of the roller gap of the rack in the first to fourth passes is controlled to be 90% of the rated water amount, and the lower water spraying amount is controlled to be 110% of the rated water amount;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line to be 2.8 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be 17 mm; controlling the dynamic thickness action amount of the last pass to be 0.145 mm; the convexity of the finished strip steel product is controlled to be 46 um; the reduction rate of the last pass is controlled to be 8.1 percent;
the finishing temperature is controlled at 866 ℃;
5) laminar cooling is carried out to the coiling temperature, and then the laminar cooling is started after the length from the head of the strip steel to 3.5m passes, the upper nozzles are cooled in a mode of closing one by one, and the lower nozzles are all closed;
6) coiling is carried out, the coiling temperature is controlled at 655 ℃, and the throwing tension is controlled at 35.1N/mm2And held until the end of the winding.
Through detection and statistics, the plate is smooth and stable, and the qualified rate of finished products is 100%.
Example 6
A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, and then pouring into a blank, wherein the thickness of the casting blank is controlled to be 51.5mm in the process of pouring into the blank by adopting a liquid core reduction mode;
2) heating the casting blank, wherein the heating temperature is controlled to be 1205 ℃, and the heating time is 33 min;
3) carrying out secondary descaling on the casting blank: controlling the pressure of the first descaling water at 184bar and the pressure of the second descaling water at 206 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 58 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading thickness is 1.05 mm; the threading speed is 9.77m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 14.85 m/s;
in the rolling tension control stage:
controlling the tension between the racks of the last three passes, wherein on the basis of the existing rolling reduction rate, the reverse three passes are increased by 19.9 percent, the reverse two passes are increased by 14.7 percent, and the reverse one pass is increased by 14.8 percent;
in the plate type control stage, the upper water spraying amount of the cooling water of the roller gap of the rack in the first to fourth passes is controlled to be 90% of the rated water amount, and the lower water spraying amount is controlled to be 110% of the rated water amount;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line to be 2.9 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be 17 mm; controlling the dynamic thickness action amount of the last pass to be 0.148 mm; the convexity of the finished strip steel product is controlled to be 49 um; the reduction rate of the last pass is controlled to be 8.9 percent;
the finishing temperature is controlled at 867 ℃;
5) cooling the laminar flow to a coiling temperature, starting the laminar flow cooling after the length from the head of the strip steel to 3.5m passes, cooling the nozzles at the upper part in a way of closing one nozzle by one nozzle, and closing all the nozzles at the lower part;
6) coiling is carried out, the coiling temperature is controlled to be 659 ℃, and the throwing tension is controlled to be 35.6N/mm2And held until the end of the winding.
Through detection and statistics, the plate is smooth and stable, and the qualified rate of finished products is 100%.
Example 7
A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, and then pouring into a blank, wherein the thickness of the casting blank is controlled to be 53mm in the process of pouring into the blank by adopting a liquid core reduction mode;
2) heating the casting blank, wherein the heating temperature is controlled to be 1209 ℃, and the heating time is 34 min;
3) carrying out secondary descaling on the casting blank: controlling the pressure of the first descaling water at 186bar and the pressure of the second descaling water at 207 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 58 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading thickness is 1.05 mm; the threading speed is 9.76m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 14.83 m/s;
in the rolling tension control stage:
controlling the tension between the racks of the last three passes, wherein the reverse three passes are increased by 19.9 percent, the reverse two passes are increased by 14.8 percent, and the reverse one pass is increased by 14.9 percent on the basis of the existing rolling reduction rate;
in the plate type control stage, the upper water spraying amount of the cooling water of the roller gap of the rack in the first to fourth passes is controlled to be 90% of the rated water amount, and the lower water spraying amount is controlled to be 110% of the rated water amount;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line to be 2.6 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be 16 mm; controlling the dynamic thickness action amount of the last pass to be 0.149 mm; the convexity of the finished strip steel product is controlled to be 48 um; the reduction rate of the last pass is controlled to be 8.6 percent;
the finishing temperature is controlled at 862 ℃;
5) cooling the laminar flow to a coiling temperature, starting the laminar flow cooling after the length from the head of the strip steel to 3.4m passes, cooling the nozzles at the upper part in a way of closing one nozzle by one nozzle, and closing all the nozzles at the lower part;
6) coiling is carried out, the coiling temperature is controlled to be 656 ℃, and the throwing tension is controlled to be 35.2N/mm2And held until the end of the winding.
Through detection and statistics, the plate is smooth and stable, and the qualified rate of finished products is 100%.
Example 8
A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, and then pouring into a blank, wherein the thickness of the casting blank is controlled to be 55.5mm in the step of pouring into the blank by adopting a liquid core reduction mode;
2) heating the casting blank, wherein the heating temperature is controlled to be 1213 ℃, and the heating time is 35 min;
3) carrying out secondary descaling on the casting blank: controlling the pressure of the first descaling water at 188bar and the pressure of the second descaling water at 210 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 57 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading thickness is 1.05 mm; the threading speed is 9.74m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 14.78 m/s;
in the rolling tension control stage:
controlling the tension between the racks of the last three passes, wherein on the basis of the existing rolling reduction rate, the reverse three passes are increased by 20.1 percent, the reverse two passes are increased by 15.3 percent, and the reverse one pass is increased by 15.2 percent;
in the plate type control stage, the upper water spraying amount of the cooling water of the roller gap of the rack in the first to fourth passes is controlled to be 90% of the rated water amount, and the lower water spraying amount is controlled to be 110% of the rated water amount;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line to be 2.8 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be 15 mm; controlling the dynamic thickness action amount of the last pass to be 0.141 mm; the convexity of the finished strip steel product is controlled to be 46 um; the reduction rate of the last pass is controlled to be 8.4 percent;
the finishing temperature is controlled to 872 ℃;
5) laminar cooling is carried out to the coiling temperature, laminar cooling is started after the length from the head of the strip steel to 3.7m passes, nozzles at the upper part of the cooling are cooled in a mode of closing one by one, and nozzles at the lower part of the cooling are all closed;
6) coiling, controlling the coiling temperature at 661 ℃, and controlling the throwing tension at 35.2N/mm2And held until the end of the winding.
Through detection and statistics, the plate is smooth and stable, and the qualified rate of finished products is 100%.
The specific embodiments are merely preferred examples and are not intended to limit the scope of the invention.
Claims (4)
1. A method for producing hot-rolled strip steel with the thickness of 1.0mm by adopting a CSP production line comprises the following steps:
1) smelting, pouring into a blank, and controlling the thickness of the casting blank to be 50-56 mm in the process of pouring into the blank by adopting a liquid core reduction mode;
2) heating the casting blank, wherein the heating temperature is controlled to be 1200-1220 ℃, and the heating time is not less than 30 min;
3) carrying out secondary descaling on the casting blank: controlling the pressure of the first descaling water to be not less than 180bar and the pressure of the second descaling water to be not less than 200 bar; and controlling the distances from the first-pass descaling upper header nozzle and the second-pass descaling upper header nozzle to the surface of the casting blank to be 55-60 mm;
4) seven passes of rolling are carried out, and the operation of each stage is as follows:
in the threading stage, the threading speed is controlled to be 9.5-9.8 m/s, and after the threading is finished, the finished product strip steel with the thickness of 1.0mm is rolled at the rolling speed of 14-15 m/s;
in the rolling tension control stage:
controlling the tension between the racks of the last three passes, wherein on the basis of the existing rolling reduction rate, the reverse three passes are increased by 19.5-20.5%, the reverse two passes are increased by 14.5-15.5%, and the reverse one pass is increased by 14.5-15.5%;
in the plate type control stage, the upper water spraying amount of the cooling water of the roller gap of the rack in the first to fourth passes is controlled to be 90% of the rated water amount, and the lower water spraying amount is controlled to be 110% of the rated water amount;
controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line not to exceed 3 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be less than or equal to 20 mm; controlling the dynamic thickness action amount of the last pass to be less than or equal to 0.2 mm; controlling the convexity of the finished strip steel product to be 45-55 um; controlling the reduction rate of the last pass to be 8-9%;
the finishing temperature is controlled to be 860-890 ℃;
5) cooling the laminar flow to a coiling temperature, starting the laminar flow cooling after the laminar flow passes from the head of the strip steel to a length of not more than 5m, cooling the nozzles at the upper part in a way of closing one nozzle by one nozzle, and closing all the nozzles at the lower part;
6) coiling is carried out, the coiling temperature is controlled to be 630-680 ℃, and the throwing tension is controlled to be 35-36N/mm2And held until the end of the winding.
2. The method of claim 1, wherein the hot rolled strip with a thickness of 1.0mm is produced by a CSP production line, and the method comprises the following steps: in the rolling tension control stage:
and controlling the tension between the racks of the last three passes, wherein the tension between the racks of the last three passes is increased by 19.8-20.2 percent, the tension between the racks of the last two passes is increased by 14.5-15.1 percent, and the tension between the racks of the last three passes is increased by 14.5-15.2 percent on the basis of the existing rolling reduction.
3. The method of claim 1, wherein the hot rolled strip with a thickness of 1.0mm is produced by a CSP production line, and the method comprises the following steps: controlling the deviation between the center of the side guide plate of each rolling mill and the rolling center line not to exceed 2.7 mm; controlling the position difference of the roller shifting of the rack in the last three passes to be less than or equal to 17 mm; controlling the dynamic thickness action amount of the last pass to be less than or equal to 0.15 mm; controlling the convexity of the finished strip steel product to be 45-51 um; the finishing temperature is controlled to be 860-883 ℃.
4. The method of claim 1, wherein the hot rolled strip with a thickness of 1.0mm is produced by a CSP production line, and the method comprises the following steps: the coiling temperature is 630-673 ℃.
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