CN111282993A - Near-net shape rail blank short-flow continuous casting and rolling production method and system - Google Patents
Near-net shape rail blank short-flow continuous casting and rolling production method and system Download PDFInfo
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- CN111282993A CN111282993A CN202010177772.8A CN202010177772A CN111282993A CN 111282993 A CN111282993 A CN 111282993A CN 202010177772 A CN202010177772 A CN 202010177772A CN 111282993 A CN111282993 A CN 111282993A
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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
- B21B1/466—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 in a non-continuous process, i.e. the cast being cut before rolling
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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
- B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/085—Rail sections
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Abstract
The invention discloses a short-process continuous casting and rolling production method and a system for a near-net-shape rail blank, belonging to the technical field of steel rail production and rolling in the iron and steel industry, and the production method comprises the following steps: continuously casting a vertical near-net-shape rail-shaped blank of a finished steel rail; cutting the near-net-shape rail-shaped blank cast continuously to length, and carrying out vertical conveying in a heat preservation state; the conveyed near-net-shape rail blank is vertically rolled, and cooling control is performed before and after the finish forming rolling. The production system comprises a continuous casting machine, a cutting device, a heat preservation roller way, a rolling mill unit and a cooling device. The invention forms a novel near-net compact steel rail universal vertical controlled rolling and controlled cooling rolling process technology by changing the traditional steel rail continuous casting post-cooling and reheating reciprocating energy consumption and the production mode of a universal horizontal rolled steel rail and combining a novel universal rolling mill set compact process arrangement and a controlled cooling device.
Description
Technical Field
The invention belongs to the technical field of steel rail production and rolling in the steel industry, and particularly relates to a short-process continuous casting and rolling production method and system for a near-net-shape rail blank.
Background
The steel rail is a main component of the railway track, and the whole production process directly influences the quality and the comprehensive mechanical property of the steel rail product. The whole process flow of the prior steel rail production comprises the following steps: blast furnace iron making, converter steel making, molten steel refining, large square billet continuous casting, square billet sizing cooling, off-line stacking, billet reheating, steel rail rolling (hole rolling method or four-roller universal rolling method), sizing cooling and subsequent finishing.
Problems with this known technique are:
1) the heat energy loss is large, and the energy consumption for reheating the square billet is high.
After the continuous casting hot square billet comes out (about 1100 ℃), the continuous casting hot square billet is cooled to a fixed length, is discharged, and is stacked to room temperature (about 25 ℃) in an off-line way. Then the steel is heated by a reheating furnace (about 1200 ℃) and then rolled in a steel rolling procedure. Thus, heat energy is lost in the cooling process of the hot square billets; after the square billet cooled to room temperature is heated by a reheating furnace, the fuel consumption is high. That is, the overall heating costs (including fuel consumption, metal loss, etc.) account for a maximum fraction of the specific weight of the rail production costs, about 60%.
2) The steel rail finished product rolled from the square billet has more forming process passes, more energy consumption of production equipment, long rolling period and low production efficiency.
3) When the two roll pass rolls the steel rail, the steel rail is extruded and deformed in the pass, the deformation distribution is uneven, and higher internal stress exists.
There are two main methods for rolling: two-roll hole-type rolling and four-roll universal rolling. In the four-roll universal rolling method, the steel rail is subjected to uniform compression deformation on four sides in a pass formed by universal rolls, the processing amount is good, the quality of the obtained steel rail product is better than that of a two-roll pass rolling method, and the advantages are more prominent than those of the two-roll pass rolling method.
4) As shown in FIG. 3, the rail is rolled in a horizontal state, the upper groove is easy to contain water, the temperature distribution of the upper groove region and the lower groove region is uneven, and the rolling state is uneven.
The steel rail is produced by adopting a universal rolling mill and a universal rolling process method, the steel rail is deformed in the universal rolling mill in a horizontal state to obtain a final finished steel rail, the schematic diagram of the traditional universal rolling steel rail is shown in an attached drawing 1, wherein 1-6 times in the diagram are finished in a cogging rolling mill, 9-13 times in the diagram are finished in the universal rolling mill and an edge rolling mill, and the process layout diagram of the universal rolling mill corresponding to the production process is shown in an attached drawing 2.
In addition, in the traditional section steel rolling concept, a rolled piece shuttles in a horizontally driven roller, and a final section steel product is obtained by adjusting parameters such as the roll gap, the shape of a hole groove and the like of the roller. The universal rolling method for producing the steel rail is not exceptional, and the steel rail is in a horizontal shape and reciprocates in a universal rolling mill and an edging mill to be subjected to rolling deformation of a universal roller and an edging roller to obtain a final steel rail finished product in a hot state. However, the steel rail is deformed in a horizontal shape in a universal mill, and the following defects can occur:
(1) water is accumulated in the steel rail groove in the rolling process.
As shown in fig. 5, when the rail-shaped blank is rolled in the universal rolling mill, the cooling water of the rolling mill and the medium water such as high-pressure water for removing phosphorus are left in the grooves on the upper surface of the rail-shaped blank to generate water, so that the phenomenon of uneven heat dissipation of the upper surface and the lower surface of the waist of the steel rail is further serious, the temperature of the upper surface of the waist after rolling is obviously lower than that of the lower surface, and the final microstructure and mechanical properties of the steel rail after rolling are affected.
(2) Asymmetry of universal rolling deformation.
In the rolling process, because the section of the steel rail has only one symmetrical plane, the axial force generated in the rolling process is large, and the steel rail is stressed towards the rail head in the horizontal direction. Because of the influence of self gravity, the steel rail freely lies down on the roller way in an inclined state, as shown in fig. 4, after the rail-shaped blank enters the universal mill, the steel rail has a tendency that the head part of the steel rail inclines downwards, so that the rolling force of the upper and lower rollers is unevenly distributed, and certain influence is generated on the axial force. Further worsens the universal rolling phenomenon which is originally asymmetric deformation, and influences the final finished product size of the steel rail.
(3) The traditional universal rolling line process is too long in arrangement.
The traditional universal rolling line process arrangement is long, so that the construction investment is increased, meanwhile, the transportation time of a hot rolled piece on a roller way is prolonged due to the fact that the production line is lengthened, the temperature drop of the rolled piece is increased, the cooling rate of the upper surface of the rolled piece can be further accelerated due to water accumulated in a groove of the upper surface of the rolled piece, and the temperature symmetry distribution of the whole section of the rolled piece is affected, for example, the U1-E1+ U2-E2+ UF universal process arrangement.
Patent ZL03816778.6 "method and apparatus for hot rolling rails" and patent ZL97114510.5 "method for rolling finished sections from rough blanks" both disclose universal rolling mill process arrangements and rolling methods, each for manufacturing rails. However, the above patents all adopt the traditional horizontal rolling, so that water is easily accumulated on the upper surface of the steel rail in the rolling process, the symmetrical distribution of the temperature of a rolled piece is influenced, and the influence on the size of the final product of the steel rail is easily caused by uneven deformation in the rolling process.
Patent CN101844150B universal method rolling technology for steel rail discloses a vertical rolling method for steel rail and technological arrangement, but the technological arrangement production line of the patent is too long, the number of universal rolling mills and edging mills is large, the investment of the whole workshop and equipment is large, the temperature drop of the steel rail in the transportation process is large, and the temperature control of rolled pieces is difficult.
Disclosure of Invention
Based on the problems of the universal rolling method and the process arrangement mode of the steel rail and the combination of the current steel rail production process and the control development level, the invention provides a novel near-net-shape rail-shaped blank short-flow continuous casting and rolling production method and a system, which can solve the problems of uneven stress, uneven temperature distribution and size deviation of a final finished product in the existing horizontal rolling of the steel rail, realize the on-line control rolling and the control cooling of the steel rail, and further improve the microstructure uniformity and the mechanical property of the section of the steel rail while ensuring the size of the final finished product.
In order to achieve the above and other related objects, the present invention provides a method for producing near-net shape rail-shaped billets by short-flow continuous casting and rolling, comprising:
1) continuously casting a vertical near-net-shape rail-shaped blank of a finished steel rail;
2) cutting the near-net-shape rail-shaped blank cast continuously to length, and carrying out vertical conveying in a heat preservation state;
3) the conveyed near-net-shape rail blank is vertically rolled, and cooling control is performed before and after the finish forming rolling.
Optionally, in step 1), performing back calculation according to the size of the finished steel rail to select the cross-sectional size of the near-net-shape rail blank, and satisfying the following conditions: the compression ratio of the near-net-shape rail-shaped blank to the finished steel rail is more than or equal to 6.
Optionally, in step 1), the near-net-shape rail blank has a rail head, a rail web and a rail bottom similar to the finished steel rail, and the distribution ratios of section metals of the rail head, the rail web and the rail bottom are the same.
Optionally, in step 2), the temperature of the section of the conveyed near-net-shape rail blank is obtained, and the corner part of the near-net-shape rail blank before rolling is subjected to uniform temperature heat compensation according to the obtained section temperature.
Optionally, in step 3), the vertical rolling is set as continuous rolling or reciprocating reversible rolling.
The invention also provides a near-net shape rail-shaped blank short-flow continuous casting and rolling production system, which is used for realizing the production method and comprises the following steps: the continuous casting machine is used for continuously casting a near-net-shape rail-shaped blank in a vertical shape; the cutting equipment is arranged behind the continuous casting machine and is used for cutting the near-net-shape rail-shaped blank cast by the continuous casting machine to a fixed length; the heat preservation roller way is used for carrying out vertical conveying on the near-net-shape rail-shaped blank subjected to fixed-length cutting in a heat preservation state; the rolling mill unit is used for vertically rolling the delivered near-net-shape rail-shaped blank and consists of a roughing mill and a finishing mill which are arranged in sequence; and the cooling devices are arranged in front of and behind the finishing mill and are used for cooling and controlling the rolling pass clearance.
The device is characterized by further comprising a temperature compensation device which is arranged in front of the rolling mill unit and used for carrying out uniform temperature heat compensation on the corner part of the near-net-shape rail-shaped blank before rolling, wherein the temperature compensation device is an induction heating device.
Furthermore, the rolling mill set is a universal continuous rolling mill set and adopts continuous rolling or reciprocating reversible rolling.
Further, the configuration form of the universal continuous rolling mill set is that a four-roller universal rolling mill, a two-roller edger and a four-roller universal rolling mill are alternately arranged.
Further, the spraying medium of the cooling device includes but is not limited to: cooling water, compressed air or aqueous mixtures.
The invention has the advantages that: the invention changes the traditional reciprocating energy consumption of cooling and reheating after steel rail continuous casting and the production mode of universal horizontal rolled steel rails, and combines a compact process arrangement and a controlled cooling device of a novel universal rolling mill set to form a novel near-net compact type steel rail universal vertical controlled rolling and controlled cooling rolling process technology. The method and the system are also suitable for the near-net shape continuous casting and rolling process of other section steel products, such as a groove parison-finished product, an angle parison-finished product and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a conventional universal rolled steel rail;
FIG. 2 is a layout diagram of a conventional universal rail rolling process;
FIG. 3 is a schematic view of water accumulated at a rail web during conventional production of steel rails;
FIG. 4 is a schematic cross-sectional view of a conventional steel rail in a roller bed during placement and operation;
FIG. 5 shows the situation of water accumulation in the upper kidney groove and asymmetric rolling tilting force existing in the rolling process of the traditional steel rail production;
FIG. 6 is a short-flow production process layout of near-net shape rail-shaped blank continuous casting and rolling;
FIG. 7 is a schematic view of a vertical rolled rail;
FIG. 8 is a schematic cross-sectional view of a rail-shaped blank;
FIG. 9 is a schematic cross-sectional view of a vertical four-roll universal rolling mill (the left and right rolls are driving rolls, and the upper and lower rolls are driving rolls or driven rolls);
FIG. 10 is a schematic cross-sectional view of a vertical rolling two-roll edging (the left and right rolls being drive rolls);
FIG. 11 is a flowchart of an embodiment;
reference is made to figure 6: the device comprises a continuous casting machine 1, a cutting device 2, a heat preservation roller way 3, a temperature supplementing device 4, a rough rolling machine 5, a finish rolling machine 6 and a cooling device 7; a four-roller universal mill U and a two-roller edger E.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
As shown in fig. 6-10, the short-flow continuous casting and rolling production system for a near-net-shape rail blank in this embodiment mainly includes a continuous casting machine 1, a cutting device 2, a heat-preserving roller bed 3, a temperature compensating device 4, a rolling mill set, and a cooling device 7, which are sequentially arranged, and the continuous casting machine 1 continuously casts the near-net-shape rail blank in a vertical shape; the cutting equipment 2 carries out fixed-length cutting on the continuously cast near-net-shape rail-shaped blank; the heat preservation roller bed 3 carries out vertical conveying on the near-net rail-shaped blank after the fixed length cutting in a heat preservation state; the temperature compensating device 4 is arranged in front of a rolling mill unit, carries out uniform temperature heat compensation on the corner part of a near-net-shape rail-shaped blank before rolling, the rolling mill unit carries out vertical rolling on the conveyed near-net-shape rail-shaped blank, and consists of a roughing mill 5 and a finishing mill 6 which are arranged in sequence, 8-12 four-roller universal rolling mills U can be adopted to carry out continuous rolling, or 3-5 four-roller universal rolling mills U can be adopted to carry out reciprocating reversible rolling, 1 universal finishing mill is added, and a two-roller edging mill E is arranged between two adjacent four-roller universal rolling mills U; the cooling device 7 is arranged in front of and behind the finishing mill 6 and is used for cooling and controlling the near-net-shape rail blank section of the rolling pass gap so as to obtain an optimized product metallographic structure and better mechanical property.
Specifically, in the continuous casting blank casting, transportation, steel rolling and rolling deformation process in the embodiment, the near-net-shape rail-shaped blank is in a standing shape. And the section size of the near-net-shape rail-shaped blank is selected by reverse calculation according to the size of the finished steel rail, and in order to meet the mechanical property of the product after the steel rail is finally formed, the compression ratio of the near-net-shape rail-shaped blank and the finished steel rail is more than or equal to 6. The near-net-shape rail-shaped blank is divided into three parts, namely a rail head, a rail web and a rail bottom, as same as a finished steel rail, and in order to meet the extending uniformity in the three-part rolling process, the distribution ratio of section metals of the three parts of the near-net-shape rail-shaped blank is the same as that of the three parts of the finished steel rail. The steel rail is continuously rolled and deformed in a rolling mill set, and a finished steel rail in a final hot state is rolled by a final (pass) universal finishing mill. The universal continuous rolling unit for vertically rolling the steel rail consists of a plurality of four-roller universal rolling mills and a plurality of two-roller edgers, wherein the specific number of the four-roller universal rolling mills and the two-roller edgers is determined according to the production process of the steel rail per pass, such as the deformation coefficient, the hole pattern system, the rolling program and the like, established by a production enterprise, and other influence factors. The four-roller universal rolling mill can be driven by four rollers and can also be driven by the rollers on the left side and the right side, and has a vertical transmission structure; the upper and lower rollers are not driven and are in a driven form. The two-roller edger has two structural forms, and the rollers on the left side and the right side have vertical transmission structures. The cooling device is arranged in a wrapping mode according to the shape of the near-net-shape rail blank so as to completely cover the cooling of the whole cross section of the near-net-shape rail blank, and the spraying media include but are not limited to: cooling water, compressed air, aqueous mixtures, and the like. The temperature compensating device adopts an induction heating device.
The near-net shape rail-shaped blank continuous casting and rolling short-process production system mainly can solve the following problems:
1) short process of steel rail production: the long-flow production process of continuous casting, offline, reheating and rolling forming in the traditional steel rail production is changed, and the short-flow production is directly carried out by continuous casting and heat preservation to rolling.
2) Energy conservation and consumption reduction in steel rail production: the short process is innovative, the heat energy loss is reduced, and the waste heat of the steelmaking continuous casting blank is utilized to directly enter the rolling process.
3) The yield and the production efficiency of the steel rail are improved: after the reheating process is reduced, the oxidation burning loss is reduced by 0.8-1.0 percent generally, and the production efficiency is improved by short-flow production after the continuous casting-steel rolling production rhythm is matched.
4) The product quality is improved under the vertical rolling process: the problem of uneven temperature distribution caused by water accumulation in a steel rail groove in the conventional horizontal rolling of the steel rail at present is solved, and the microstructure performance after rolling is uneven; the cross section size deviation caused by uneven up-down rolling force caused by the self-weight tipping of the steel rail in the horizontal rolling can be obviously improved.
5) Short-flow process arrangement: the short-flow compact arrangement of continuous casting-steel rolling is realized, the workshop length is more compact and shorter than the split arrangement of the traditional continuous casting workshop and steel rolling workshop, the transportation distance and time of the blank in a hot state are reduced, the heat loss and the power consumption of rolling work are reduced, the rolling efficiency is improved, and the engineering construction investment and the operation cost are reduced.
6) By the online rolling and cooling control process and equipment, the metallographic structure of the product is finely granulated, the final mechanical property of the product is improved, and more favorable conditions are created for the subsequent cooling and pre-bending of the full-length steel rail.
7) And realizing input-output optimization.
The short-flow continuous casting and rolling production method of the near-net shape rail-shaped blank comprises the following steps: continuously casting a vertical near-net-shape rail-shaped blank of a finished steel rail; cutting the near-net-shape rail-shaped blank cast continuously to length, and carrying out vertical conveying under heat preservation; acquiring the temperature of the section of the conveyed near-net-shape rail-shaped blank, and performing uniform-temperature heat compensation on the corner part of the near-net-shape rail-shaped blank before rolling according to the acquired section temperature; the conveyed near-net-shape rail blank is vertically rolled, and cooling control is performed before and after the finish forming rolling. Simply speaking, the continuous casting and rolling processes are combined into an integral workshop, the continuously cast near-net-shape rail-shaped blank is directly transported to a rolling mill set through a roller way with heat preservation measures to be rolled and deformed, a finished steel rail is finally rolled by a last rolling mill, and the section of the near-net-shape rail-shaped blank of the rolling pass gap is cooled and controlled before and after the rolling of the last rolling mill.
As shown in fig. 11, the whole process flow is described in detail by a specific embodiment as follows:
1) vertical continuous casting of a near-net-shape rail-shaped blank: continuously casting the raw materials into a near-net-shape rail-shaped blank of a product in a vertical shape by continuous casting;
2) according to the length of a finished steel rail, the length of a near-net-shape rail-shaped blank is reversely deduced, in order to meet the mechanical property of a product after the final forming of the steel rail, the compression ratio of the near-net-shape blank and the finished blank is more than or equal to 6, the near-net-shape blank is segmented by fixed-length cutting equipment after the near-net-shape rail-shaped blank is continuously cast, and the cutting equipment can be gas cutting, saw cutting or cutting in other forms, such as flying shears; the near-net-shape rail-shaped blank is divided into three parts, namely a rail head, a rail web and a rail bottom, as same as a finished steel rail, and the distribution ratio of section metals of the three parts is the same as that of the three parts of metals of the finished steel rail in order to meet the uniformity of extension in the rolling process of the three parts;
3) continuously casting a near-net-shape rail-shaped blank to a rolling mill train section, adopting a high-speed transportation roller way and having a heat preservation measure so as to reduce transportation time and temperature drop;
4) an accident rejection device/buffer device and an induction heating device are arranged at the front part of the rolling mill unit so as to match and control the production rhythm of continuous casting and continuous rolling and carry out heat compensation optimization on the uniform temperature of the section of a rolled piece; if the temperature of the partial area of the near-net-shape rail blank section is lower (the lower corner of a rail head or the bottom edge corner of a rail, etc.), a temperature supplementing device can be arranged in front of a rolling mill set to supplement the temperature to the blank section uniformly;
5) the near-net-shape rail-shaped blank is then conveyed to a rolling mill set for rolling, the rolling mill set is divided into a universal continuous rolling mill set and two groups of rolling mills, namely a roughing mill and a finishing mill, and the configuration mode is as follows: the method is characterized by comprising the following steps of (1) alternately arranging a four-roller universal rolling mill, a two-roller edger and a four-roller universal rolling mill … …, namely, firstly feeding the rolled pieces into a roughing mill to perform continuous rolling for 9 times in total of U1-E1-U2-E2-U3-E3-U4-E4-U5, then performing controlled cooling process of a cooling device in front of a finishing mill to control the temperature distribution of the cross section of the rolled pieces to be uniform and reach the final rolling forming temperature required by the process, and then feeding the rolled pieces into a finishing mill group to perform continuous rolling forming for 3 times in total of U6-E5-U7;
6) after the rolled and formed steel rail is subjected to controlled cooling after rolling through the controlled cooling process of the cooling device after finish rolling, the cooling process is further optimized to obtain a finer finished product metallographic structure, and the purpose of improving the mechanical property of the finished product is achieved; the controlled cooling facilities of the cooling device are arranged in a wrapping mode according to the shape of the steel rail so as to completely cover the cooling of the whole section of the steel rail, and the spraying media include but are not limited to: cooling water, compressed air, aqueous mixtures, and the like;
7) after the rolling deformation is finished, the subsequent procedures are immediately carried out, including the procedures of steel rail printing, sawing, steel rail heat treatment, cooling, straightening, detection and flaw detection, sawing and drilling, collection and warehousing and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The short-flow continuous casting and rolling production method of the near-net-shape rail-shaped blank is characterized by comprising the following steps of:
1) continuously casting a vertical near-net-shape rail-shaped blank of a finished steel rail;
2) cutting the near-net-shape rail-shaped blank cast continuously to length, and carrying out vertical conveying in a heat preservation state;
3) the conveyed near-net-shape rail blank is vertically rolled, and cooling control is performed before and after the finish forming rolling.
2. The near-net-shape rail blank short-flow continuous casting and rolling production method according to claim 1, characterized in that in the step 1), the cross-section size of the near-net-shape rail blank is selected according to the size of a finished steel rail by reverse calculation, and the requirements are that: the compression ratio of the near-net-shape rail-shaped blank to the finished steel rail is more than or equal to 6.
3. The short-process continuous casting and rolling production method of the near-net shape rail blank according to claim 1, wherein in the step 1), the near-net shape rail blank has similar rail head, rail web and rail bottom of a finished steel rail, and the section metal distribution ratio of the rail head, the rail web and the rail bottom of the near-net shape rail blank is the same.
4. The short-process continuous casting and rolling production method of the near-net shape rail blank according to claim 1, characterized in that in the step 2), the temperature of the section of the delivered near-net shape rail blank is obtained, and the corner part of the near-net shape rail blank just before rolling is subjected to uniform temperature heat compensation according to the obtained section temperature.
5. The near-net type rail billet short-flow continuous casting and rolling production method according to claim 1, characterized in that in the step 3), the vertical rolling is set as continuous rolling or reciprocating reversible rolling.
6. A near-net shape rail billet short-process continuous casting and rolling production system, which is used for realizing the production method of any one of claims 1 to 5, and comprises the following steps: a continuous casting machine (1) for continuously casting a near-net-shape rail-shaped blank in a vertical shape; the cutting equipment (2) is arranged behind the continuous casting machine and is used for cutting the near-net-shape rail-shaped blank cast by the continuous casting machine to a fixed length; the heat preservation roller way (3) is used for carrying out vertical conveying on the near-net-shape rail-shaped blank subjected to fixed-length cutting in a heat preservation state; the rolling mill unit is used for vertically rolling the delivered near-net-shape rail-shaped blank and consists of a roughing mill (5) and a finishing mill (6) which are arranged in sequence; and cooling devices (7) arranged in front of and behind the finishing mill for cooling and controlling the rolling pass gap.
7. The near-net shape rail blank short-flow continuous casting and rolling production system according to claim 6, characterized by further comprising a temperature compensation device (4) arranged in front of the rolling mill unit and used for carrying out uniform temperature and heat compensation on the corner position of the near-net shape rail blank just before rolling, wherein the temperature compensation device is an induction heating device.
8. The near-net shape rail blank short-flow continuous casting and rolling production system as claimed in claim 6, wherein the rolling mill set is a universal continuous rolling mill set and adopts continuous rolling or reciprocating reversible rolling.
9. The near-net shape rail billet short-run continuous casting and rolling production system as claimed in claim 8, wherein the universal mill train is configured in the form of an alternate arrangement of a four-roll universal mill (U) -a two-roll edger (E) -a four-roll universal mill (U).
10. The near-net shape rail billet short-run continuous casting and rolling production system according to claim 6, wherein the spraying medium of the cooling device comprises but is not limited to: cooling water, compressed air or aqueous mixtures.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877964A (en) * | 2021-09-26 | 2022-01-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving toughness of steel rail |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113877964A (en) * | 2021-09-26 | 2022-01-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving toughness of steel rail |
| CN113877964B (en) * | 2021-09-26 | 2024-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving toughness of steel rail |
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