CN113145639A - Production method and production line of high-carbon high-chromium wire - Google Patents
Production method and production line of high-carbon high-chromium wire Download PDFInfo
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- CN113145639A CN113145639A CN202110437707.9A CN202110437707A CN113145639A CN 113145639 A CN113145639 A CN 113145639A CN 202110437707 A CN202110437707 A CN 202110437707A CN 113145639 A CN113145639 A CN 113145639A
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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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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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
- B21B37/56—Elongation control
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B2045/0212—Cooling devices, e.g. using gaseous coolants using gaseous coolants
Abstract
The invention belongs to the technical field of industrial section bar production, and relates to a production method and a production line of a high-carbon high-chromium wire, wherein the production method comprises the following steps: heating a blank, rough and medium rolling, pre-finish rolling, reducing and sizing, pinching and spinning, controlling cooling, collecting and collecting coils. The production line comprises a heating furnace, a rough rolling unit, a medium rolling unit, a pre-finish rolling unit, a reducing and sizing unit, a wire spinning unit, a stelmor air cooling line and a coil collecting device which are sequentially arranged; temperature control devices are arranged between every two adjacent units in the rough rolling unit, the middle rolling unit, the pre-finish rolling unit and the finish rolling unit; the temperature control device is water cooling equipment or a heating and heat preservation device. According to the invention, the temperature control device is adopted in the re-rolling process to control the temperature difference of the rolled piece, so that the full-line constant-temperature rolling production is realized, the defects of head and tail splitting, cracking, corner cracking and the like in the hot rolling process are reduced, and the failure rate is reduced; and after reducing the diameter, the controlled cooling is adopted, so that the spinning temperature is effectively controlled, and the precipitation type of the net-shaped carbide is inhibited.
Description
Technical Field
The invention belongs to the technical field of industrial section bar production, and relates to a production method and a production line of a high-carbon high-chromium wire.
Background
The high-carbon high-chromium steel includes Cr12 series die steel, 95Cr18 series martensitic stainless steel, 102Cr17 series super austenitic stainless steel, etc., and these steels have high hardenability, toughness, wear resistance, etc. However, in the production process, the plasticity is poor, the processing window is narrow, eutectic carbide is easy to form, the toughness of the material is reduced, the anisotropy of the steel is caused by the nonuniform carbide, the carbide is segregated in a net shape, a belt shape and a block shape, and the defects of grinding cracks and the like are easy to cause. In the process of rolling high-carbon high-chromium steel in the existing production, the high-efficiency rolling difficulty is very high, and some defects exist:
1) the head-tail temperature difference of the rolled piece of the rough-medium rolling mill set is large, and the phenomena of head cracking, tail cracking, head splitting and tail splitting are easy to occur;
2) the finishing mill group adopts centralized transmission, the wire rod is continuously rolled, the temperature rise of the finishing mill group cannot be controlled, the product quality cannot be effectively controlled, and the wire rod can be produced only by a method of reducing the production speed of the wire rod;
3) the production speed is lower, and the production line yield is low.
Disclosure of Invention
In view of the above, the present invention provides a method for producing a high-carbon high-chromium wire and a production line thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
a production method of a high-carbon high-chromium wire rod comprises the following steps:
1) heating the blank: heating and insulating the blank by a heating furnace;
2) rough and medium rolling: a heating and heat-preserving device is arranged behind the rough rolling unit and the intermediate rolling unit, the deformation temperature of each pass in the rough rolling and intermediate rolling processes is controlled to be 1050-1150 ℃, and the temperature difference between the head and the tail of a rolled piece and the temperature difference between the core surface of the rolled piece in the rolling process are not more than 50 ℃;
3) pre-finish rolling: a heating device or a water cooling device is arranged behind the pre-finishing mill group, the deformation temperature of each pass in the pre-finishing rolling process is controlled to be 1050-1150 ℃, and the temperature difference between the head and the tail of the rolled piece and the temperature difference between the core surface of the rolled piece in the rolling process are not more than 50 ℃;
4) finish rolling: in the finish rolling process, a plurality of finish rolling units connected in series are adopted for carrying out multi-pass rolling, and the deformation temperature of each pass is controlled to be 1000-1100 ℃; the single-pass elongation coefficient is 1.10-1.25;
5) reducing diameter: in the finish rolling process, a plurality of reducing sizing units connected in series are adopted for carrying out multi-pass rolling, and the deformation temperature of each pass is controlled to be 1000-1100 ℃ in the rolling process;
6) pinching and spinning: the spinning temperature is controlled to be 880-950 ℃;
7) controlling cooling and collecting rolls: and the stelmor air-cooled line cooling process adopts sectional cooling and is collected in a coil collecting way.
According to the basic scheme, the temperature of a rolled piece is controlled in the rolling process, and multiple groups of sections are adopted for rolling, so that the rolling and spinning temperatures of the high-carbon high-chromium steel wire rod are reduced, the head-tail temperature difference is controlled, and the constant-temperature rolling of the wire rod is realized; the phenomenon of head and tail splitting in the hot rolling process is reduced, and the yield of the wire rod are improved.
Further, in the step 4) and the step 5), the finishing mill group or the reducing and sizing mill group adopts 2 stands and 1 group of modular rolling mills or 2 stands and 1 group of independent transmission rolling mills, the rolled piece is controlled and cooled, and the temperature difference between the head and the tail of the rolled piece and the temperature difference between the core surface of the rolled piece are not more than 50 ℃.
Further, in the step 5), two reducing and sizing machine sets are connected in series, namely a first reducing and sizing machine set and a second reducing and sizing machine set arranged behind the first reducing and sizing machine set; the single-pass elongation coefficient of the first reducing sizing machine set is 1.10-1.25, and the single-pass elongation coefficient of the second reducing sizing machine set is 1.01-1.15.
Furthermore, return slow cooling sections with different lengths for slowly cooling the rolled piece are arranged behind the pre-finishing mill group, the finishing mill group and the reducing and sizing mill group, and the lengths of the return slow cooling sections are sequentially increased from the previous working procedure to the subsequent working procedure.
Further, the sectional cooling in the step 7) is quick cooling and then slow cooling, wherein the quick cooling is adopted when the temperature is higher than 850 ℃, the cooling speed is higher than 2 ℃/s, and the slow cooling is adopted when the temperature is lower than 850 ℃, and the cooling speed is 0.5-2 ℃/s.
A high-carbon high-chromium wire production line comprises a heating furnace, a rough rolling unit, a middle rolling unit, a pre-finish rolling unit, a reducing and sizing unit, a wire spinning unit, a Stelmor air cooling line and a coil collecting device which are sequentially arranged; temperature control devices are arranged between every two adjacent units in the rough rolling unit, the middle rolling unit, the pre-finish rolling unit and the finish rolling unit; the temperature control device is water cooling equipment or a heating and heat preservation device.
Further, the finishing unit comprises a plurality of finishing mill groups connected in series; the finishing mill group includes the finishing mill, locates the water cooling plant behind the finishing mill, the finishing mill is the modularization rolling mill of 1 group of 2 frames or 2 frames are the independent transmission rolling mill of 1 group, beneficial effect: the dredging device conducts dredging on the aggregate bin, and further prevents material blockage.
Further, the reducing and sizing unit comprises a plurality of reducing and sizing units connected in series, each reducing and sizing unit comprises a reducing and sizing rolling mill and water cooling equipment arranged behind the reducing and sizing rolling mill, and each reducing and sizing rolling mill is a modular rolling mill with 2 frames and 1 group or an independent transmission rolling mill with 2 frames and 1 group.
Furthermore, a return slow cooling section is arranged behind the pre-finish rolling unit and behind each finishing mill group and the reducing sizing mill group, and the length of the return slow cooling section is increased from the previous process to the next process.
Furthermore, a head cutting flying shear device is arranged between the rough rolling unit and the middle rolling unit and between the middle rolling unit and the pre-finish rolling unit; the laying unit comprises a pinch roll and a laying head which are arranged in sequence.
The invention has the beneficial effects that:
1) and a heating and heat-preserving device is arranged behind the roughing mill group and the intermediate mill group to heat the tail part of the rolled piece, so that the head-tail temperature difference of the rolled piece is effectively reduced, and the head-tail and core surface temperature difference of the rolled piece are reduced.
2) A heating device or a water cooling device is arranged behind the pre-finishing mill group, temperature control can be performed according to temperature changes in the production process of products with different specifications, and the temperature difference between the head and the tail of a rolled piece and the temperature difference between the core surface and the core surface are effectively reduced.
3) The finishing mill group and the reducing and sizing mill group adopt 2 stands and 1 group of modular mills or 2 stands and 1 group of independent transmission mills, so that the temperature rise problem of the centralized transmission finishing mill group and the reducing and sizing mill group can be effectively avoided, and the deformation temperature of the rolled piece can be effectively controlled.
4) After the finishing mill group and the reducing sizing mill group are adopted, the length of the variable-distance return section is adopted, and the cooling effect of temperature change caused by pass temperature rise and different sizes of rolled pieces is effectively improved.
5) The method has the advantages that the full-line constant-temperature rolling production is realized, the defects of head and tail splitting, cracking, corner cracks and the like in the hot rolling process are reduced, the failure rate is reduced, the wire rod yield is improved, and the wire rod yield is improved by 1.5-4.0% compared with that of a conventional high-carbon high-chromium high-speed wire rod production line.
6) And after reducing the diameter, the controlled cooling is adopted, so that the spinning temperature is effectively controlled, and the precipitation type of the net-shaped carbide is inhibited.
7) The stelmor air-cooled line cooling process adopts sectional cooling, which is favorable for controlling the carbide form, improving the tissue uniformity and providing good tissue conditions for subsequent processing or heat treatment.
8) The production method and the production line have low production and maintenance cost, are easy to realize industrial production, and have obvious economic benefit.
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
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a production line layout according to the present invention;
FIG. 2 is a schematic view of a conventional production line layout;
FIG. 3 is a graph of the temperature drop of the production line of FIG. 2;
FIG. 4 is a graph of temperature drop during production in the production line of FIG. 1;
reference numerals: 1-heating a furnace; 2-roughing mill train; 3-heating and insulating device after rough rolling; 4-a head cutting flying shear after rough rolling; 5-a middle mill group; 6-heating and insulating device after intermediate rolling; 7-a head cutting flying shear after intermediate rolling; 8-pre-finishing mill group; 9-pre-finish rolling water tank; 10-pre-finish rolling and post-heating device; 11-a head cutting flying shear after pre-finish rolling; 12-a first finishing mill; 13-first finishing mill rear water tank; 14-a second finishing mill; 15-second finishing mill rear water tank; 16-a third finishing mill; 17-a third finishing mill rear water tank; 18-a fourth finishing mill; 19-a fourth finishing mill rear water tank; 20-a first reducing sizing machine; 21-a first reducing sizing machine rear water tank; 22-a second reducing sizing machine; 23-a second reducing sizing machine rear water tank; 24-pinch roll and laying head; 25-stelmor air cooling line and coil collecting station; 26-a first recovery slow cooling section; 27-second recovery slow cooling section; 28-third recovery slow cooling section; 29-fourth recovery slow cooling section; 30-fifth recovery slow cooling section; 31-sixth recovery slow cooling section; 32-seventh recovery slow cooling section.
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.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Example 1
Referring to fig. 1, a high-carbon high-chromium wire production line includes a heating furnace 1, a rough rolling unit, a middle rolling unit, a pre-finish rolling unit, a reducing and sizing unit, a wire spinning unit, a stelmor air cooling line and a coil collecting station 25.
The rough rolling unit comprises a rough rolling unit 2, a heating and heat preserving device 3 after rough rolling and a cutting head flying shear 4 after rough rolling which are arranged in sequence; the middle rolling unit comprises a middle rolling unit 5, a heating and heat-preserving device 6 after middle rolling and a cutting head flying shear 7 after middle rolling which are arranged in sequence; the pre-finish rolling unit comprises a pre-finish rolling unit 8, a pre-finish rolling rear water tank 9, a pre-finish rolling rear heating device 10 and a pre-finish rolling rear crop flying shear 11 which are sequentially arranged.
The finish rolling unit comprises a first finish rolling mill 12, a first finish rolling mill rear water tank 13, a second finish rolling mill 14, a second finish rolling mill rear water tank 15, a third finish rolling mill 16, a third finish rolling mill rear water tank 17, a fourth finish rolling mill 18 and a fourth finish rolling mill rear water tank 19 which are sequentially arranged; all finishing mills used 2 stands with 1 set of modular mills.
The reducing and sizing unit comprises a first reducing and sizing machine 20, a first reducing and sizing machine rear water tank 21, a second reducing and sizing machine 22 and a second reducing and sizing machine rear water tank 23 which are arranged in sequence; all reducing sizing machines adopt 2 frames and 1 group of modular rolling mills; the laying unit includes pinch rolls and a laying head 24.
Wherein, a first return slow cooling section 26, a second return slow cooling section 27, a third return slow cooling section 28, a fourth return slow cooling section 29, a fifth return slow cooling section 30, a sixth return slow cooling section 31 and a seventh return slow cooling section 32 which are sequentially increased in length are respectively arranged behind the pre-finish rolling post-crop shearing machine 11, the first finish rolling post-water tank 13, the second finish rolling post-water tank 15, the third finish rolling post-water tank 17, the fourth finish rolling post-water tank 19, the first reducing sizing mill post-water tank 21 and the second reducing sizing mill post-water tank 23.
The production method of the high-carbon high-chromium wire rod by adopting the high-carbon high-chromium wire rod production line comprises the following specific implementation steps:
(1) heating the blank: heating and insulating the blank by using a heating furnace 1, wherein the section of the continuous casting blank is 150mm multiplied by 12000mm, and the heating temperature is 1250 ℃;
(2) rough rolling: utilizing a roughing mill group 2 to perform 6-pass rolling on the square billet heated in the step (1) in a horizontal and vertical alternative or flat roll rolling mode, removing phosphorus by high-pressure water at the outlet of a heating furnace 1 without starting, and controlling the deformation temperature of each pass to be 1150 ℃ in the rolling process;
(3) heating, preserving heat and cutting head after rough rolling: heating the tail part of the rolled piece rolled in the step (2) by using a heating and heat-preserving device 3 after rough rolling to ensure that the temperature difference between the head and the tail of the rolled piece and the temperature difference between the core surface of the rolled piece are not more than 50 ℃, carrying out induction heating by using a heating device, arranging a heat-preserving roller way after heating, and cutting the head by using a cutting flying shear 4 after rough rolling to ensure that the rolled piece is smoothly bitten into a medium mill unit 5;
(4) intermediate rolling: rolling the rolled piece subjected to end cutting in the step (3) by using a middle rolling mill unit 5, wherein the deformation temperature of each pass is controlled to 1150 ℃ in the rolling process;
(5) heating, preserving heat and cutting head after intermediate rolling: heating the tail part of the rolled piece rolled in the step (4) by using a middle post-rolling heating and heat preserving device 6, ensuring that the temperature difference between the head and the tail of the rolled piece and the temperature difference between the core surface of the rolled piece are not more than 50 ℃, wherein the heating device can adopt induction heating, a heat preserving roller way is arranged after heating, and a middle post-rolling head cutting flying shear 7 is used for cutting the head of the rolled piece so as to ensure that the rolled piece is smoothly bitten into a pre-finishing mill unit 8;
(6) pre-finish rolling: rolling the rolled piece subjected to end cutting in the step (5) by using a pre-finishing mill group 8, wherein the deformation temperature of each pass is controlled to 1150 ℃ in the rolling process;
(7) and (3) controlling cooling after pre-finish rolling: the rolled piece rolled in the step (6) is controlled and cooled by a pre-finish rolling post-water tank 9 and a pre-finish rolling post-heating device 10, and cooling is carried out by adopting variable water volume or variable water pressure, so that the temperature difference between the head and the tail and the core surface is not more than 50 ℃ when the rolled piece is rolled;
(8) finish rolling 1: carrying out 2-pass rolling on the rolled piece which is controlled to be cooled in the step (7) by using a first finishing mill 12, wherein the deformation temperature of each pass is controlled to be 1100 ℃ in the rolling process; the single-pass elongation coefficient is 1.10;
(9) and (3) controlling cooling after finish rolling 1: controlling and cooling the rolled piece rolled in the step (8) by using a first finishing mill rear water tank 13, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head, the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters the next rack;
(10) finish rolling 2: 2-pass rolling is carried out on the rolled piece which is controlled to be cooled in the step (9) by using a second finishing mill 14, and the deformation temperature of each pass is controlled to be 1100 ℃ in the rolling process; the single-pass elongation coefficient is 1.10;
(11) and (3) controlling cooling after finish rolling 2: controlling and cooling the rolled piece rolled in the step (10) by using a second finishing mill rear water tank 15, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head, the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters the next rack;
(12) finish rolling 3: carrying out 2-pass rolling on the rolled piece which is controlled to be cooled in the step (11) by using a third finishing mill 16, wherein the deformation temperature of each pass is controlled to be 1100 ℃ in the rolling process; the single-pass elongation coefficient is 1.10;
(13) and (3) controlling cooling after finish rolling: controlling and cooling the rolled piece rolled in the step (12) by using a third finishing mill rear water tank 17, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head, the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters the next rack;
(14) finish rolling 4: performing 2-pass rolling on the rolled piece subjected to the controlled cooling in the step (13) by using a fourth finishing mill 18, wherein the deformation temperature of each pass is controlled to be 1100 ℃ in the rolling process; the single-pass elongation coefficient is 1.10;
(15) and (4) controlling cooling after finish rolling: controlling and cooling the rolled piece rolled in the step (14) by using a rear water tank 19 of a fourth finishing mill, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head, the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters a next rack;
(16) reducing diameter 1 and rolling: 2-pass rolling is carried out on the rolled piece which is controlled to be cooled in the step (15) by using a first reducing sizing mill 20, and the deformation temperature of each pass is controlled to be 1100 ℃ in the rolling process; the single-pass elongation coefficient is 1.10;
(17) and (3) after reducing diameter 1, controlling cooling: controlling and cooling the rolled piece rolled in the step (16) by using a rear water tank 21 of a first reducing sizing mill, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head and the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters a next rack;
(18) reducing diameter 2: 2-pass rolling is carried out on the rolled piece which is controlled to be cooled in the step (17) by using a second reducing sizing mill 22, the specifications of the rolled wire rods are phi 5.0mm, phi 5.5mm and phi 6.0mm, and the deformation temperature of each pass is controlled to be 1100 ℃ in the rolling process; the single-pass elongation coefficient is 1.01;
(19) and (3) after diameter reduction 2, cooling control: controlling and cooling the rolled piece rolled in the step (18) by using a second reducing sizing mill rear water tank 23, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head and the tail of the rolled piece and the core surface is not more than 50 ℃ when the rolled piece enters the next rack;
(20) pinching and spinning: clamping and spinning the rolled piece cooled in the step (19) at 950 ℃;
(21) stelmor air cooling line control cooling and coil collection: and (3) performing controlled cooling on the wire coil in the step (20), wherein the cooling process adopts sectional cooling, when the temperature is higher than 850 ℃, fast cooling is adopted, the cooling speed is higher than 2 ℃/s, the modes of increasing air quantity, adjusting the speed of a roller way and the like can be adopted, when the temperature is lower than 850 ℃, slow cooling is adopted, the cooling speed is 0.5-2 ℃/s, the cooling mode can be realized by closing a heat-insulating cover, closing a fan, adjusting the speed of the roller way and the like, and the collection temperature of the coil is 550 ℃.
Example 2
This example uses the same production line as example 1, and the production method includes the following steps:
(1) heating the blank: heating and insulating the blank by using a heating furnace 1, wherein the section of the continuous casting blank is 200mm multiplied by 6000mm, and the heating temperature is 1150 ℃;
(2) rough rolling: utilizing a roughing mill group 2 to perform 6-pass rolling on the square billet heated in the step (1) in a horizontal and vertical alternative or flat roll rolling mode, removing phosphorus by high-pressure water at the outlet of a heating furnace 1 without starting, and controlling the deformation temperature of each pass to be 1050 ℃ in the rolling process;
(3) heating, preserving heat and cutting head after rough rolling: heating the tail part of the rolled piece rolled in the step (2) by using a heating and heat-preserving device 3 after rough rolling to ensure that the temperature difference between the head and the tail of the rolled piece and the temperature difference between the core surface of the rolled piece are not more than 50 ℃, carrying out induction heating by using a heating device, arranging a heat-preserving roller way after heating, and cutting the head by using a cutting flying shear 4 after rough rolling to ensure that the rolled piece is smoothly bitten into a medium mill unit 5;
(4) intermediate rolling: rolling the rolled piece subjected to end cutting in the step (3) by using a middle rolling mill group 5, wherein the deformation temperature of each pass is controlled to be 1050 ℃ in the rolling process;
(5) heating, preserving heat and cutting head after intermediate rolling: heating the tail part of the rolled piece rolled in the step (4) by using a middle post-rolling heating and heat preserving device 6, ensuring that the temperature difference between the head and the tail of the rolled piece and the temperature difference between the core surface of the rolled piece are not more than 50 ℃, wherein the heating device can adopt induction heating, a heat preserving roller way is arranged after heating, and a middle post-rolling head cutting flying shear 7 is used for cutting the head of the rolled piece so as to ensure that the rolled piece is smoothly bitten into a pre-finishing mill unit 8;
(6) pre-finish rolling: rolling the cut rolled piece in the step (5) by using a pre-finishing mill group 8, wherein the deformation temperature of each pass is controlled to be 1050 ℃ in the rolling process;
(7) and (3) controlling cooling after pre-finish rolling: the rolled piece rolled in the step (6) is controlled and cooled by a pre-finish rolling post-water tank 9 and a pre-finish rolling post-heating device 10, and cooling is carried out by adopting variable water volume or variable water pressure, so that the temperature difference between the head and the tail and the core surface is not more than 50 ℃ when the rolled piece is rolled;
(8) finish rolling 1: carrying out 2-pass rolling on the rolled piece which is controlled to be cooled in the step (7) by using a first finishing mill 12, wherein the deformation temperature of each pass is controlled to be 1000 ℃ in the rolling process; the single-pass elongation coefficient is 1.25;
(9) and (3) controlling cooling after finish rolling 1: controlling and cooling the rolled piece rolled in the step (8) by using a first finishing mill rear water tank 13, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head, the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters the next rack;
(10) finish rolling 2: 2-pass rolling is carried out on the rolled piece which is controlled to be cooled in the step (9) by a second finishing mill 14, and the deformation temperature of each pass is controlled to be 1000 ℃ in the rolling process; the single-pass elongation coefficient is 1.25;
(11) and (3) controlling cooling after finish rolling 2: controlling and cooling the rolled piece rolled in the step (10) by using a second finishing mill rear water tank 15, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head, the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters the next rack;
(12) finish rolling 3: carrying out 2-pass rolling on the rolled piece which is controlled to be cooled in the step (11) by using a third finishing mill 16, wherein the deformation temperature of each pass is controlled to be 1000 ℃ in the rolling process; the single-pass elongation coefficient is 1.25;
(13) and (3) controlling cooling after finish rolling: controlling and cooling the rolled piece rolled in the step (12) by using a third finishing mill rear water tank 17, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head, the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters the next rack;
(14) finish rolling 4: carrying out 2-pass rolling on the rolled piece subjected to the controlled cooling in the step (13) by using a fourth finishing mill 18, wherein the deformation temperature of each pass is controlled to be 1000 ℃ in the rolling process; the single-pass elongation coefficient is 1.25;
(15) and (4) controlling cooling after finish rolling: controlling and cooling the rolled piece rolled in the step (14) by using a rear water tank 19 of a fourth finishing mill, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head, the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters a next rack;
(16) reducing diameter 1 and rolling: 2-pass rolling is carried out on the rolled piece which is controlled to be cooled in the step (15) by using a first reducing sizing mill 20, and the deformation temperature of each pass is controlled to be 1000 ℃ in the rolling process; the single-pass elongation coefficient is 1.25;
(17) and (3) after reducing diameter 1, controlling cooling: controlling and cooling the rolled piece rolled in the step (16) by using a rear water tank 21 of a first reducing sizing mill, and controlling and cooling by adopting variable water volume or variable water pressure to ensure that the temperature difference between the head and the tail and the core surface of the rolled piece is not more than 50 ℃ when the rolled piece enters a next rack;
(18) reducing diameter 2: 2-pass rolling is carried out on the rolled piece which is controlled to be cooled in the step (17) by a second reducing sizing mill 22, the specifications of the rolled wire rods are phi 8.0mm, phi 8.5mm and phi 9.0mm, and the deformation temperature of each pass is controlled to be 1000 ℃ in the rolling process; the single-pass elongation coefficient is 1.15;
(19) and (3) after diameter reduction 2, cooling control: controlling and cooling the rolled piece rolled in the step (18) by using a second reducing sizing mill rear water tank 23, and taking into consideration the rolling temperature rise of the reducing sizing mill unit module 2 and the head-tail temperature difference of the rolled piece, adopting variable water volume or variable water pressure to control and cool so as to ensure that the head-tail temperature difference and the core surface temperature difference are not more than 50 ℃ when the rolled piece enters the next rack;
(20) pinching and spinning: clamping and spinning the rolled piece cooled in the step (19) at a spinning temperature of 880 ℃;
(21) stelmor air cooling line control cooling and coil collection: and (3) performing controlled cooling on the wire coil in the step (20), wherein the cooling process adopts sectional cooling, when the temperature is higher than 850 ℃, quick cooling is adopted, the cooling speed is higher than 2 ℃/s, the modes of increasing air quantity, adjusting the speed of a roller way and the like can be adopted, when the temperature is lower than 850 ℃, slow cooling is adopted, the cooling speed is 0.5-2 ℃/s, the cooling mode can be realized by closing a heat-insulating cover, closing a fan, adjusting the speed of the roller way and the like, and the coil collecting and collecting temperature is 650 ℃.
Comparative examples
Referring to fig. 2, the present embodiment adopts a conventional production line arrangement, which includes a heating furnace 1, a rough rolling unit, a middle rolling unit, a pre-finish rolling unit, a sizing reduction unit, a wire spinning unit, a stelmor air cooling line, and a coil collecting station 25.
The rough rolling unit comprises a rough rolling unit 2 and a head cutting flying shear 4 after rough rolling, which are arranged in sequence; the middle rolling unit comprises a middle rolling unit 5 and a head cutting flying shear 7 after middle rolling which are arranged in sequence; the pre-finish rolling unit comprises a pre-finish rolling unit 8, a pre-finish rolling rear water tank 9 and a pre-finish rolling rear crop flying shear 11 which are arranged in sequence.
The finish rolling unit comprises a first finish rolling mill 12, a second finish rolling mill 14, a third finish rolling mill 16, a fourth finish rolling mill 18 and a fourth finish rolling mill rear water tank 19 which are arranged in sequence; all finishing mills used 2 stands with 1 set of modular mills.
The reducing and sizing unit comprises a first reducing and sizing machine 20, a second reducing and sizing machine 22 and a second reducing and sizing machine rear water tank 23 which are arranged in sequence; all reducing sizing machines adopt 2 frames and 1 group of modular rolling mills; the laying unit includes pinch rolls and a laying head 24.
By comparing the temperature change conditions of the rolled pieces in the production process of the embodiment 1 and the comparative embodiment with the temperature change conditions of the rolled pieces in the production process of the embodiment 3 and the comparative embodiment, the production line disclosed by the invention has the advantages that the temperature fluctuation of the rolled pieces during rolling is smaller, and the rolling temperature control is more accurate.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A production method of a high-carbon high-chromium wire is characterized by comprising the following steps:
1) heating the blank: heating and insulating the blank by a heating furnace;
2) rough and medium rolling: a heating and heat-preserving device is arranged behind the rough rolling unit and the intermediate rolling unit, the deformation temperature of each pass in the rough rolling and intermediate rolling processes is controlled to be 1050-1150 ℃, and the temperature difference between the head and the tail of a rolled piece and the temperature difference between the core surface of the rolled piece in the rolling process are not more than 50 ℃;
3) pre-finish rolling: a heating device or a water cooling device is arranged behind the pre-finishing mill group, the deformation temperature of each pass in the pre-finishing rolling process is controlled to be 1050-1150 ℃, and the temperature difference between the head and the tail of the rolled piece and the temperature difference between the core surface of the rolled piece in the rolling process are not more than 50 ℃;
4) finish rolling: in the finish rolling process, a plurality of finish rolling units connected in series are adopted for carrying out multi-pass rolling, and the deformation temperature of each pass is controlled to be 1000-1100 ℃; the single-pass elongation coefficient is 1.10-1.25;
5) reducing diameter: in the finish rolling process, a plurality of reducing sizing units connected in series are adopted for carrying out multi-pass rolling, and the deformation temperature of each pass is controlled to be 1000-1100 ℃ in the rolling process;
6) pinching and spinning: the spinning temperature is controlled to be 880-950 ℃;
7) controlling cooling and collecting rolls: and the stelmor air-cooled line cooling process adopts sectional cooling and is collected in a coil collecting way.
2. The production method of the high-carbon high-chromium wire rod as claimed in claim 1, wherein: in the steps 4) and 5), the finishing mill group or the reducing and sizing mill group adopts 2 stands and 1 group of modular rolling mills or 2 stands and 1 group of independent transmission rolling mills, the rolled piece is controlled and cooled, and the temperature difference between the head and the tail of the rolled piece and the core surface is controlled to be not more than 50 ℃.
3. The production method of the high-carbon high-chromium wire rod as claimed in claim 2, wherein: in the step 5), two groups of reducing and sizing machine sets are connected in series, namely a first reducing and sizing machine set and a second reducing and sizing machine set arranged behind the first reducing and sizing machine set; the single-pass elongation coefficient of the first reducing sizing machine set is 1.10-1.25, and the single-pass elongation coefficient of the second reducing sizing machine set is 1.01-1.15.
4. The production method of the high-carbon high-chromium wire rod as claimed in claim 1, wherein: and return slow cooling sections with different lengths for slowly cooling the rolled piece are arranged behind the pre-finishing mill group, the finishing mill group and the reducing and sizing mill group, and the lengths of the return slow cooling sections are sequentially increased from the previous process to the subsequent process.
5. The production method of the high-carbon high-chromium wire rod as claimed in claim 1, wherein: and step 7), the sectional cooling is quick cooling and then slow cooling, wherein the quick cooling is adopted when the temperature is higher than 850 ℃, the cooling speed is higher than 2 ℃/s, and the slow cooling is adopted when the temperature is lower than 850 ℃, and the cooling speed is 0.5-2 ℃/s.
6. The utility model provides a high chromium wire rod production line of high carbon which characterized in that: the device comprises a heating furnace, a rough rolling unit, a middle rolling unit, a pre-finish rolling unit, a reducing and sizing unit, a wire spinning unit, a stelmor air cooling line and a coil collecting device which are sequentially arranged; temperature control devices are arranged between every two adjacent units in the rough rolling unit, the middle rolling unit, the pre-finish rolling unit and the finish rolling unit; the temperature control device is water cooling equipment or a heating and heat preservation device.
7. The high-carbon high-chromium wire production line of claim 6, wherein: the finish rolling unit comprises a plurality of finish rolling units connected in series; the finishing mill group comprises a finishing mill and water cooling equipment arranged behind the finishing mill, wherein the finishing mill is a modular rolling mill with 2 stands and 1 group or an independent transmission rolling mill with 2 stands and 1 group.
8. The high-carbon high-chromium wire production line of claim 7, wherein: the reducing and sizing unit comprises a plurality of reducing and sizing units connected in series, each reducing and sizing unit comprises a reducing and sizing rolling mill and water cooling equipment arranged behind the reducing and sizing rolling mill, and each reducing and sizing rolling mill is a modular rolling mill with 2 frames and 1 group or an independent transmission rolling mill with 2 frames and 1 group.
9. The high-carbon high-chromium wire production line of claim 8, wherein: and a return slow cooling section is arranged behind the pre-finish rolling unit and behind each finishing mill group and the reducing sizing mill group, and the length of the return slow cooling section is increased from the previous process to the next process in sequence.
10. The high-carbon high-chromium wire production line of claim 6, wherein: head cutting flying shear equipment is arranged between the rough rolling unit and the middle rolling unit and between the middle rolling unit and the pre-finish rolling unit; the laying unit comprises a pinch roll and a laying head which are arranged in sequence.
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| CN202110437707.9A CN113145639A (en) | 2021-04-22 | 2021-04-22 | Production method and production line of high-carbon high-chromium wire |
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| CN202110437707.9A CN113145639A (en) | 2021-04-22 | 2021-04-22 | Production method and production line of high-carbon high-chromium wire |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113664035A (en) * | 2021-08-25 | 2021-11-19 | 新疆天山钢铁巴州有限公司 | Production method and system for improving yield of high-speed wire rod production line |
| CN114082780A (en) * | 2021-11-20 | 2022-02-25 | 酒泉钢铁(集团)有限责任公司 | Production process for reducing residual stress of large-size high-carbon steel wire |
-
2021
- 2021-04-22 CN CN202110437707.9A patent/CN113145639A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113664035A (en) * | 2021-08-25 | 2021-11-19 | 新疆天山钢铁巴州有限公司 | Production method and system for improving yield of high-speed wire rod production line |
| CN114082780A (en) * | 2021-11-20 | 2022-02-25 | 酒泉钢铁(集团)有限责任公司 | Production process for reducing residual stress of large-size high-carbon steel wire |
| CN114082780B (en) * | 2021-11-20 | 2024-03-08 | 酒泉钢铁(集团)有限责任公司 | Production process for reducing residual stress of large-sized high-carbon steel wire rod |
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