CN111633027A - Rolling method for prolonging service life of roller for conventional hot continuous rolling thin-specification strip steel - Google Patents
Rolling method for prolonging service life of roller for conventional hot continuous rolling thin-specification strip steel Download PDFInfo
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- CN111633027A CN111633027A CN202010528726.8A CN202010528726A CN111633027A CN 111633027 A CN111633027 A CN 111633027A CN 202010528726 A CN202010528726 A CN 202010528726A CN 111633027 A CN111633027 A CN 111633027A
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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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Abstract
The invention discloses a rolling method, in particular discloses a rolling method for prolonging the service life of a roller for conventional hot continuous rolling thin-specification strip steel, and belongs to the technical field of steel plate and strip steel rolling processes. The rolling method for prolonging the service life of the roller for the conventional hot continuous rolling thin-specification strip steel is simple in process and low in investment cost. The rolling method achieves the purpose of prolonging the service life of the roller by adopting sectional quantitative rolling arrangement, flexible selection of rolling passes of a roughing mill set and cooling control of finished product rolling to prolong the damage and falling time of an oxide film on the surface of the roller on the premise of controlling the thermal regulation of a rolled plate blank, wherein the finished product rolling is finish rolling.
Description
Technical Field
The invention relates to a rolling method, in particular to a rolling method for prolonging the service life of a roller for conventional hot continuous rolling thin-specification strip steel, and belongs to the technical field of steel plate and strip steel rolling processes.
Background
The ultrathin strip steel with the thickness h less than or equal to 2.50mm and the thickness h less than 2.0mm is a product with high added value and high technical content. For hot continuous rolling, the stable, high-quality and high-efficiency rolling control of thin and extremely thin hot rolled strip steel is a technical problem of world level. Generally speaking, the short-flow CSP, ESP, cast rolling and other production lines roll thin and extremely thin hot rolled strip steel, and have certain advantages of process, equipment and control. However, for conventional hot continuous rolling, rolling with thin gauge, especially with extremely thin gauge, is difficult. The hot rolled products 'hot replacing cold' and 'thin replacing thick' are structural requirements and development trends, and the industries such as buildings, machinery, automobiles, household appliances and the like put forward the requirements on the hot rolled strip steel with thin specification and extremely thin specification from the aspects of energy conservation, environmental protection and the like, and the quality requirements of the products such as high strength, light weight, high surface precision and the like are required.
With the improvement of conventional hot continuous rolling process equipment and control technology, the size precision, the plate shape quality and the performance stability of thin-specification and ultrathin-specification products can reach good control levels, but due to the fact that the thin-specification products are large in rolling load, high in rolling speed, high in temperature and long in pure rolling time, and due to frequent strip threading and tail throwing of conventional hot continuous rolling, an oxidation film of a finish rolling working roller is frequently dropped and pressed into the surface of strip steel to generate quality defects in the rolling process, uneven abrasion of the roller can also sensitively affect the rolling stability of the strip steel, quality problems of the strip steel such as deviation, rolling breakage, wave shape and the like and production accidents are frequently caused, and the stability, batch and efficient rolling of the thin-specification and ultrathin-specification products are directly influenced. The scientific, reasonable and accurate arrangement of the rolling process of the strip steel in the rolling process of thin specification and ultrathin specification of the conventional hot continuous rolling is an important method for effectively controlling the surface and the stability.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the rolling method for prolonging the service life of the roller for the conventional hot continuous rolling thin-specification strip steel is simple in process and low in investment cost.
The technical scheme adopted for solving the technical problems is as follows: a rolling method for prolonging the service life of roller used for conventional hot continuous rolling of thin-gauge strip steel features that on the premise of controlling the thermal regulation of the rolled plate blank, the sectional quantitative rolling arrangement, the flexible selection of rolling pass by rough rolling unit and the cooling control of finished product rolling are used to prolong the damage and dropping time of oxide film on the surface of roller
Wherein the rolling of the finished product is the rolling of a finishing mill.
Further, the thermal regulation is that the plate blank is heated by a conventional walking beam type heating furnace, the plate blank is fed into the furnace by a hot-delivery hot-charging mode, the tapping temperature is 1210-1250 ℃, the rolling temperature is 1020-1050 ℃, and the tapping temperature and the rolling temperature are both controlled according to the upper and middle limits; when the slab is heated in a conventional walking beam type heating furnace, the soaking time t of the slab is more than or equal to 25min, the temperature difference delta t between the upper part and the lower part of the slab, in the table and between the head and the tail of the slab is less than or equal to 25 ℃, and the target value of the tapping temperature of each furnace increases by 5-10 ℃ from near to far away from the rolling mill.
The preferable mode of the scheme is that before entering the finishing mill group, the finish rolling plate blank is treated by adopting a hot coil box coiling, heat preservation and uniform technology.
Further, the sectional quantitative rolling arrangement comprises three-stage alternate rolling of a thin gauge strip steel product, a middle transition specified strip steel product and a thin gauge strip steel product, wherein the total kilometer number of the thin gauge strip steel product is 30-35Km, the thin gauge strip steel product is a rolling unit,
wherein the kilometers of each section of product rolling is controlled according to the following table.
The preferable mode of the scheme is that the material and specification requirements of the rolled strip steel product at the middle transition section are that the material adopts Q195, Q235 or SPHC soft steel, the rolling thickness is 2.5-4.0 mm, the rolling thickness gradually transited to the rear section thin specification is the optimal rolling thickness, and the width is 50-100mm larger than the rear section thin specification rolling width.
Furthermore, the roughing mill group flexibly selects rolling passes by taking two roughing mills as a group, and adopts a rolling mode control that each roughing mill is respectively used for rolling 3 passes, a first roughing mill is used for rolling 1 pass, a second roughing mill is used for rolling 5 passes, a first roughing mill is used for rolling 1 pass, a second roughing mill is used for rolling 3 passes or a first roughing mill is idle and a second roughing mill is used for rolling 5 passes.
The preferable mode of the scheme is that in the finished product rolling, the reverse water spraying and the roll gap cooling water of the front frame of the finished product are started, the roll gap cooling water of the finished product frame is started, and the finishing mill group has the roll gap rolling lubricating function and is put into use.
The invention has the beneficial effects that: the rolling method of the application can prolong the damage and the falling time of the oxide film on the surface of the roller by adjusting all procedures and control links of the rolling process on the basis of the existing thermal regulation, namely adopting the sectional quantitative rolling arrangement rolling, the flexible selection of the rolling pass of a roughing mill set and the cooling control of the finished product rolling to realize the purpose of prolonging the service life of the roller. Therefore, the rolling method provided by the application can achieve the purpose of the invention only by adjusting the working procedures and key control links, and further achieves the purposes of ensuring the simplicity of the process and not generating large cost investment. Solves the technical problems of poor surface quality and poor rolling stability of the strip steel caused by early damage and falling of the roller oxide film in the rolling process of the thin plate (belt) and the ultrathin plate (belt) for a long time in the prior art.
Detailed Description
In order to solve the technical problems in the prior art, the invention provides the rolling method for prolonging the service life of the roller for the conventional hot continuous rolling thin-gauge strip steel, which has the advantages of simple process and low investment cost. The rolling method achieves the purpose of prolonging the service life of the roller by adopting sectional quantitative rolling arrangement, flexible selection of rolling passes of a roughing mill set and cooling control of finished product rolling to prolong the damage and falling time of an oxide film on the surface of the roller on the premise of controlling the thermal regulation of a rolled plate blank, wherein the finished product rolling is finish rolling. The rolling method of the application is based on the existing thermal regulation, and can prolong the damage and the falling time of the oxide film on the surface of the roller by adjusting all working procedures and key control links of the rolling process, namely adopting sectional quantitative rolling arrangement, flexible selection of rolling passes of a roughing mill set and cooling control of finished product rolling, thereby realizing the purpose of prolonging the service life of the roller. Therefore, the rolling method provided by the application can achieve the purpose of the invention only by adjusting the working procedures and key control links, and further achieves the purposes of ensuring the simplicity of the process and not generating large cost investment. Solves the technical problems of poor surface quality and poor rolling stability in the rolling of thin plates (strips) and ultrathin plates (strips) existing and puzzling in the prior art for a long time.
In the embodiment, in order to carry out more important adjustment on equipment and processes as few as possible and effectively improve the rolling quality of hot continuous rolling thin-specification strip steel and hot continuous rolling ultrathin-specification strip steel, the thermal regulation provided by the application is that a plate blank is heated by a conventional walking beam type heating furnace, the plate blank is fed into the furnace by a hot-delivery hot-charging mode, the tapping temperature is 1210-1250 ℃, the rolling temperature is 1020-1050 ℃, and the tapping temperature and the rolling temperature are both controlled according to the upper middle limit; when the slab is heated in a conventional walking beam type heating furnace, the soaking time t of the slab is more than or equal to 25min, the temperature difference delta t between the upper part and the lower part of the slab, in the table and between the head and the tail of the slab is less than or equal to 25 ℃, and the target value of the tapping temperature of each furnace increases by 5-10 ℃ from near to far away from the rolling mill. Meanwhile, before entering a finishing mill group, a finish rolling plate blank is treated by adopting a hot coil box coiling, heat preservation and uniform technology. The tapping temperature and the start-up temperature are controlled according to the middle upper limit, namely the tapping temperature and the start-up temperature of 1250 ℃ and 1050 ℃ are respectively selected as much as possible.
Of course, in addition to adjustments in process and critical control links and parameters, the output of each rolling pass of the present application is also specified to protect the oxide film on the roll surface. Specifically, the sectional quantitative rolling arrangement comprises three-stage alternate rolling of thin-specification strip steel products, a middle transition specified strip steel product and a thin-specification strip steel product, wherein the total kilometer number of the thin-specification strip steel product is 30-35Km, and the kilometer number of the product rolling of each stage is controlled according to the following table.
In this case, the preferred rolling mill layout structure is that the roughing mill set flexibly selects rolling passes, for example, two roughing mills are configured, and each roughing mill is used for rolling 3 passes, the first roughing mill is used for rolling 1 pass, the second roughing mill is used for rolling 5 passes, the first roughing mill is used for rolling 1 pass, the second roughing mill is used for rolling 3 passes, or the first roughing mill is empty and the second roughing mill is used for rolling 5 passes. And here: in the finished product rolling, the back water spraying and the roll gap cooling water of the front rack of the finished product are opened, the roll gap cooling water of the finished product rack is opened, and the finishing mill group has the roll gap rolling lubricating function and is put into use. Meanwhile, the application also puts forward requirements on the material and the specification of the rolled strip steel part at the middle transition section, and specifically, the material adopts Q195, Q235 or SPHC soft steel, the rolling thickness is 2.5-4.0 mm, the gradual transition to the rear section thin specification rolling thickness is the optimal rolling thickness, and the width is 50-100mm larger than the rear section thin specification rolling width.
In summary, the rolling method for prolonging the service life of the roller for the conventional hot continuous rolling thin gauge strip steel provided by the application specifically aims to control the problems of surface and rolling stability caused by the falling of an oxide film of a finish rolling working roller or uneven wear of the roller in the rolling process of thin gauge, especially extremely thin gauge. The innovative, scientific, reasonable and accurate rolling schedule arrangement and the flexible process control technology matched with a rough rolling mode, an intermediate cooling mode, a hot coil box heat preservation mode, a temperature equalization technology and the like are adopted to control the falling of an oxide film of a roller and the uneven abrasion of the roller, and the stable and high-quality rolling of the conventional hot continuous rolling thin-gauge strip steel is realized. The technical scheme of the application has the characteristics that the characteristics are mainly embodied in the following aspects:
1) according to the characteristics of the conventional hot continuous rolling process and the mechanism of forming and falling off of the oxide film of the finish rolling roller, the invention innovatively provides the sectional arrangement and process control technology of the rolling process in the rolling process, and has creativity;
2) the rolling method of the thin gauge strip steel adopts the sectional rolling process arrangement and the flexible process control technology under the condition of not increasing the production cost, and has novelty and practicability;
the rolling method provided by the application aims at the difficult points and outstanding problems existing in the conventional hot continuous rolling of thin specifications and extremely thin specifications, combines the production practice, effectively controls and improves the surface quality and rolling stability problems in the thin specification rolling process, improves the rolling stability, solves the practical technical problem, realizes the efficient and high-quality batch production of thin specification products, and has the advantages of novelty, creativity, strong practicability and no investment.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The purpose of the invention is as follows: a rolling technology for conventional hot continuous rolling of thin band steel features that the surface and rolling stability problems caused by the falling off of the oxide film of finish rolling roller or the uneven wear of roller during rolling are controlled. The innovative, scientific, reasonable and accurate rolling schedule arrangement and the flexible process control technology matched with a rough rolling mode and an intermediate cooling are adopted to control the falling of the oxide film of the roller and the uneven wear of the roller so as to realize the stable and high-quality rolling of the conventional hot continuous rolling thin-specification strip steel.
The specific technical scheme is as follows:
1) a thermal regulation system: heating the plate blank by using a conventional walking beam type heating furnace, wherein the discharging temperature is 1210-1250 ℃, and the temperature is controlled according to the middle and upper limits; particularly, the soaking time t of the plate blank is more than or equal to 25min, the temperature difference delta t between the upper part and the lower part, in the surface and between the head and the tail is less than or equal to 25 ℃, and the target value of the tapping temperature of each furnace increases by 5-10 ℃ from near to far away from the rolling mill. In particular, the slab charging mode is optimally hot charging.
2) Particularly, according to specific varieties and rolling specifications, in order to ensure the initial rolling temperature of finish rolling to be 1020-1050 ℃, the rough rolling mill set can flexibly select a rolling mode of '3 + 3', '1 + 5', '1 + 3' or '0 + 5', an intermediate cooling technology and the like.
3) Particularly, in order to ensure the temperature uniformity of the strip billet, a hot coil box coiling, heat preservation and uniformity technology is adopted before the strip billet enters a finishing mill group.
4) Particularly, the rolling schedule of the thin gauge products adopts a sectional quantitative rolling schedule method, namely the thin gauge products, the intermediate transition products and the thin gauge products, and the thin gauge products in the rolling unit are arranged after the transition materials of the finish rolling and the roll changing are rolled, the total rolling kilometer number of the thin gauge products in the rolling unit is controlled to be 30-35Km, the rolling kilometer number is a professional term in the field, namely the length of the rolled strip steel, and the specific table is shown in Table 1.
Table 1 rules of rolling process of thin gauge sectional rolling method,
5) the material and specification requirements of the transition section are as follows: the material is soft steel such as Q195, Q235, SPHC and the like, the rolling thickness is 2.5-4.0 mm, the rolling thickness gradually transited to the rear section thin specification is the optimal rolling thickness, and the width is 50-100mm larger than the rear section thin specification rolling width.
6) In the rolling process, the reverse water spraying and roll gap cooling water of the finished product front rack are started, and the roll gap cooling water of the finished product rack is started.
7) In particular, in the implementation process of the method, the finishing mill group has the roll gap rolling lubrication function and is used, so that the implementation effect can be improved. And 1) to 7) are combined and applied to be the optimal technical scheme.
The technical scheme of the application mainly aims at controlling the problems of surface and rolling stability caused by the falling of an oxide film of a finish rolling working roll or the uneven wear of a roller in the rolling process of thin specifications, particularly extremely thin specifications. The innovative, scientific, reasonable and accurate sectional rolling process arrangement and the flexible process control technologies such as rough rolling mode, intermediate cooling and the like are adopted to control the falling of the oxide film of the roller and the uneven wear of the roller, so that the stable and high-quality rolling of the conventional hot continuous rolling thin-gauge strip steel is realized. Through implementation and application for nearly 3 years, 200 more than ten thousand tons of thin specifications of 2.5mm and below and 30 more than ten thousand tons of extremely thin specifications of 2.0mm and below are rolled on a certain conventional hot continuous rolling production line, the process yield is improved by 1.47%, the rolling waste rate is reduced by 31.6%, the surface quality degradation rate is reduced by more than 8.0%, and the hot continuous rolling production line has strong practicability and obvious effect.
The application has the main characteristics that:
1) according to the characteristics of the conventional hot continuous rolling process and the formation and falling mechanism of the oxide film of the finish rolling roller, the sectional arrangement and process control technology of the rolling process in the rolling process is innovatively provided, and the method is creative;
2) the method adopts a process control technology of sectional rolling schedule arrangement and flexible matching under the condition of not increasing the production cost, and has novelty and practicability.
3) Aiming at the difficult points and the outstanding problems existing in the conventional hot continuous rolling of thin specifications and extremely thin specifications, the method combines the production practice, effectively controls and improves the surface quality and the rolling stability in the thin specification rolling process, improves the rolling stability, solves the practical technical problem, realizes the high-efficiency and high-quality batch production of thin specification products, and has novelty, creativity, strong practicability and no investment.
The following detailed description of the preferred embodiments of the present invention will be made with reference to the specific technical solutions: it should be understood that the preferred embodiments are only for illustrating the technical solutions of the present application, and are not intended to limit the scope of the present application.
Example 1:
the thin gauge of 34Km is rolled by adopting a 1450mm conventional hot continuous rolling mill set in the embodiment, which is as follows:
1) rolling steel grades: SAPH440, the slab tapping temperature 1230 and 1240 ℃, the soaking time 30min, and the slab cold charging.
2) The rough rolling adopts a 3+3 rolling mode, and the rolled steel is coiled by a hot coiling box, kept warm and equalized in temperature and then sent to a finishing mill group.
3) The rolling temperature of the finishing mill set is 1030 ℃, the water is sprayed on the front machine frame of the finished product in a reverse mode, the cooling water for the roll gap is opened, the cooling water for the roll gap of the finished machine frame is opened, and the finished machine frame is used for lubrication rolling.
4) Rolling procedure programming: front segment SAPH440, specification 2.3X 1160mm,19 Km; transition section: SPHC, specification 3.0-2.75mm × 1160-1200 mm; posterior segment SAPH440, 1.8X 1180mm,15 Km.
The implementation effect is as follows:
the implementation process has the advantages of stable rolling process, good quality of the surface and the shape of the strip steel coil, no rolling waste and no degradation judgment.
Example 2:
the thin gauge of 32Km is rolled by adopting a 1450mm conventional hot continuous rolling mill set in the embodiment, which is as follows:
1) rolling steel grades: SAPH440 and QSTE420, the slab discharging temperature is 1230-1250 ℃, the soaking time is 25min, and the slab is hot-fed and hot-loaded.
2) The rough rolling adopts a 1+5 rolling mode, and the rolled steel is coiled by a hot coiling box, kept warm and equalized in temperature and then sent to a finishing mill group.
3) The rolling temperature of the finishing mill set is 1030 ℃, the water is sprayed on the front machine frame of the finished product in a reverse mode, the cooling water for the roll gap is opened, the cooling water for the roll gap of the finished machine frame is opened, and the finished machine frame is used for lubrication rolling.
4) Rolling procedure programming: front segment SAPH440, specification 1.5X 1100mm,20 Km; transition section: Q235G, the specification is 3.0-3.5mm multiplied by 1250 mm; back-end QSTE420, specification: 2.3X 1200mm,12 Km.
The implementation effect is as follows:
the implementation process has the advantages of stable rolling process, good quality of the surface and the shape of the strip steel coil, no rolling waste and no degradation judgment.
Claims (7)
1. A rolling method for prolonging the service life of a roller for conventional hot continuous rolling thin-specification strip steel is characterized in that: the rolling method adopts sectional quantitative rolling arrangement, flexible selection of rolling passes of a roughing mill set and cooling control of finished product rolling to prolong the damage and falling time of the oxide film on the surface of the roller so as to realize the purpose of prolonging the service life of the roller on the premise of controlling the thermal regulation of the rolled plate blank,
wherein the rolling of the finished product is the rolling of a finishing mill.
2. The rolling method for extending the life of a roll for a conventional hot continuous rolling thin gauge strip as claimed in claim 1, wherein: the thermal regulation is that a plate blank is heated by a conventional walking beam type heating furnace, the plate blank is fed into the furnace by a hot-delivery hot-charging mode, the tapping temperature is 1210-1250 ℃, the rolling temperature is 1020-1050 ℃, and the tapping temperature and the rolling temperature are both controlled according to the middle and upper limits; when the slab is heated in a conventional walking beam type heating furnace, the soaking time t of the slab is more than or equal to 25min, the temperature difference delta t between the upper part and the lower part of the slab, in the table and between the head and the tail of the slab is less than or equal to 25 ℃, and the target value of the tapping temperature of each furnace increases by 5-10 ℃ from near to far away from the rolling mill.
3. The rolling method for extending the life of a roll for a conventional hot continuous rolling thin gauge strip as claimed in claim 2, wherein: before entering a finishing mill group, a finish rolling plate blank is treated by adopting a hot coil box coiling, heat preservation and uniform technology.
4. The rolling method for prolonging the life of the roll for the conventional hot continuous rolling thin gauge strip steel according to any one of claims 1 to 3, characterized in that: the sectional quantitative rolling arrangement comprises three-stage alternative rolling of a thin gauge strip steel product, a middle transition specified strip steel product and a thin gauge strip steel product, wherein the total kilometer number of the rolling unit is 30-35Km,
wherein the rolling kilometers of each section product is controlled according to the following table,
5. the rolling method for extending the life of a roll for a conventional hot continuous rolling thin gauge strip as claimed in claim 4, wherein: the material and specification requirements of the rolled strip steel product at the middle transition section are that the material adopts Q195, Q235 or SPHC soft steel, the rolling thickness is 2.5-4.0 mm, the rolling thickness gradually transited to the rear section thin specification is the optimal rolling thickness, and the width is 50-100mm larger than the rear section thin specification rolling width.
6. The rolling method for extending the life of a roll for a conventional hot continuous rolling thin gauge strip as claimed in claim 5, wherein: the roughing mill group flexibly selects rolling passes by taking two roughing mills as a group, and adopts a rolling mode control that each roughing mill is respectively used for rolling 3 passes, a first roughing mill is used for rolling 1 pass, a second roughing mill is used for rolling 5 passes, the first roughing mill is used for rolling 1 pass, the second roughing mill is used for rolling 3 passes or the first roughing mill is idle and the second roughing mill is used for rolling 5 passes.
7. The rolling method for extending the life of a roll for a conventional hot continuous rolling thin gauge strip as claimed in claim 5, wherein: in the finished product rolling, the back water spraying and the roll gap cooling water of the front rack of the finished product are opened, the roll gap cooling water of the finished product rack is opened, and the finishing mill group has the roll gap rolling lubricating function and is put into use.
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| CN202010528726.8A CN111633027A (en) | 2020-06-11 | 2020-06-11 | Rolling method for prolonging service life of roller for conventional hot continuous rolling thin-specification strip steel |
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| CN202010528726.8A CN111633027A (en) | 2020-06-11 | 2020-06-11 | Rolling method for prolonging service life of roller for conventional hot continuous rolling thin-specification strip steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112893476A (en) * | 2021-01-15 | 2021-06-04 | 山信软件股份有限公司 | Method for calculating rolling mileage of cold rolling mill |
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| CN103599946A (en) * | 2013-11-22 | 2014-02-26 | 四川西南不锈钢有限责任公司 | Thin stainless steel product rolling process control method |
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