CN113319121A - Production method of anti-seismic deformed steel bar HRB400E - Google Patents
Production method of anti-seismic deformed steel bar HRB400E Download PDFInfo
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- CN113319121A CN113319121A CN202110643112.9A CN202110643112A CN113319121A CN 113319121 A CN113319121 A CN 113319121A CN 202110643112 A CN202110643112 A CN 202110643112A CN 113319121 A CN113319121 A CN 113319121A
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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
- B21B15/0007—Cutting or shearing the product
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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
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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
- B21B45/02—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
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The invention relates to a production method of anti-seismic deformed steel bar HRB400E, which comprises the following steps: (1) arranging a water penetrating device; (2) controlling rolling: the deformation of the rolled piece in the rough rolling unit is 40-50%, the deformation of the rolled piece in the intermediate rolling unit is 30-40%, and the deformation of the rolled piece in the finishing rolling unit is 10-20%; (3) and (3) controlling cooling: according to the specification of the finished product deformed steel bar HRB400E, two-section water penetration or three-section water penetration is adopted, and after the rolled piece is subjected to middle rolling in a middle rolling mill set for one-section pre-water penetration, the surface temperature of the rolled piece is reduced to 870-910 ℃ from 1020-1060 ℃; after the rolled piece finishes finish rolling in the finishing mill group and passes through water in the second section, reducing the surface temperature of the rolled piece from 950-1000 ℃ to 850-900 ℃ (or omitting water passing in the second section); after passing through a finish rolling 18# rolling mill, water is penetrated in the third section to reduce the temperature of the rolled piece to 790-850 ℃; the method realizes the purpose of producing the new national standard qualified deformed steel bar HRB400E by the low-V alloy through rolling control and cooling control, greatly reduces the production cost of the product and has strong market competitiveness.
Description
Technical Field
The invention relates to the technical field of manufacturing of deformed steel bars, in particular to a production method of anti-seismic deformed steel bar HRB 400E.
Background
The deformed steel bar has the comprehensive properties of good obdurability, weldability and the like, and is widely applied to reinforced concrete building structures. With the rapid development of economic construction in China, the projects of infrastructure such as houses, bridges, roads, important energy sources, traffic and the like are rapidly increased, and the investment of macroscopic economy and fixed assets is kept continuously increased. The construction industry is one of the fastest-developing industries in China and developing countries, wherein the deformed steel bar is the largest construction steel material and plays a vital role in national economic development.
The deformed steel bars are divided into two grades, three grades and four grades according to the strength grade, and HRB400E are most widely used. In the manufacturing process, most manufacturers adopt a strong water penetrating process, but with the implementation of a new national standard GB/T1499.2-2018, the strong water penetrating process cannot meet the requirements of the new national standard on material structures (the rolling mill spacing of old and old bar production equipment is small, and water penetrating devices cannot be reasonably arranged), so that most manufacturers adopt a large amount of V, Nb, Ti and other trace elements to be added for alloying or increase a new production line, and the requirements of the new national standard on the physical properties and the metallographic structure of HRB400E deformed steel are met through a conventional rolling process.
According to the report of related data, at present, most manufacturers adopt V iron or VN alloy for microalloying, the addition amount of each unit is different due to different equipment, but V is more than 0.025 percent in a component system no matter the microalloying process or the microalloying and controlled rolling process is adopted independently, so that the manufacturing cost is increased for an enterprise producing deformed steel bar by using a short-process electric arc furnace, and the market competitiveness of the product is greatly reduced.
Disclosure of Invention
The invention aims to solve the problem of high cost caused by the deformed steel bar, and provides a production method of anti-seismic deformed steel bar HRB400E, aiming at obtaining a product which has the advantages of mechanical property and metallographic structure meeting the requirements of GB/T1499.2-2018, low alloy V content, low manufacturing cost and strong market competitiveness.
The invention discloses a production method of anti-seismic deformed steel bar HRB400E, wherein the deformed steel bar HRB400E contains the following chemical elements in percentage by weight: c: 0.22 to 0.25%, Si: 0.40 to 0.50%, Mn: 1.40-1.45%, V: 0.005-0.015%, P is less than or equal to 0.045%, S is less than or equal to 0.045%, and the balance is Fe and inevitable impurities;
the production process of the deformed steel HRB400E comprises the following steps:
(1) the water penetrating device is provided with: the rolling mill is divided into a roughing mill group, a middle mill group and a finishing mill group, wherein: the roughing mill is provided with 6 stands of rolling mills, namely a 1# rolling mill and a 6# rolling mill respectively, 1# flying shears are arranged behind the 6# rolling mill, the middle rolling mill is provided with 6 stands of rolling mills, namely a 7# rolling mill and a 12# rolling mill respectively, 2# flying shears are arranged behind the 12# rolling mill, the finishing mill is provided with 6 stands of rolling mills, namely a 13# rolling mill and a 18# rolling mill respectively, and 3# flying shears are arranged at a position 24 meters away from the 18# rolling mill; a first section of water penetrating device is arranged between a 11# rolling mill and a 12# rolling mill of a middle rolling mill group, a second section of water penetrating device is arranged between a 16# rolling mill and a 17# rolling mill of a finishing rolling mill group, and a third section of water penetrating device is arranged between a 18# rolling mill of finishing rolling and a 3# flying shear;
(2) controlling rolling: the deformation of the rolled piece in the rough rolling unit is 40-50%, the deformation of the rolled piece in the intermediate rolling unit is 30-40%, and the deformation of the rolled piece in the finishing rolling unit is 10-20%;
(3) and (3) controlling cooling: according to the specification of the finished threaded steel HRB400E, two-section water penetration or three-section water penetration is adopted; the method comprises the following steps: cooling the double-line and three-line split deformed steel bar with the specification of phi 12-phi 18mm by three-section water penetration, and reducing the surface temperature of a rolled piece from 1020-1060 ℃ to 870-910 ℃ after the rolled piece is subjected to middle rolling for one-section pre-water penetration in a middle rolling mill set, wherein the temperature reduction amplitude is more than or equal to 150 ℃; after the rolled piece finishes finish rolling in the second section of water penetration in the finishing mill group, reducing the surface temperature of the rolled piece from 950-1000 ℃ to 850-900 ℃, wherein the temperature reduction amplitude is more than or equal to 100 ℃; after the rolled piece passes through a finish rolling 18# rolling mill, adjusting a post-rolling controlled cooling device, and passing water in a third section to reduce the surface temperature of the rolled piece to 780-830 ℃, and then, returning the temperature to 800-850 ℃ in a cooling bed; cooling rolled pieces with the specification of phi 20-32 mm by adopting two-section water penetration, namely cooling by adopting only a first section water penetration device and a third section water penetration device; after the rolled piece is subjected to intermediate rolling in the intermediate rolling mill unit for a section of pre-water penetration, the surface temperature of the rolled piece is reduced to 870-910 ℃ from 1020-1060 ℃, the temperature reduction amplitude is larger than or equal to 150 ℃, after the rolled piece is subjected to finish rolling in the finishing rolling mill unit, a post-rolling cooling control device is adjusted, the water penetration in the third section is carried out to directly reduce the surface temperature of the rolled piece from 950-1000 ℃ to 780-830 ℃, and then the temperature of the rolled piece is returned to 800-850 ℃ in a cooling bed.
The distance between two adjacent rolling mills of the roughing mill group 1# to 6# rolling mill is 4000mm, the distance between two adjacent rolling mills of the intermediate mill group 7# to 11# rolling mill is 3000mm, the distance between 11# rolling mill and 12# rolling mill is 4500mm, and the distance between two adjacent rolling mills of the finishing mill group 13# to 18# rolling mill is 4500 mm.
The first section of water penetrating device is a single-wire water penetrating device and is only provided with one section of water penetrating device; the second section of water penetrating device is a double-line or three-line water penetrating device, and only one section of water penetrating device is arranged; the third section of water penetrating device is a single-line or double-line or three-line water penetrating device or a slow cooling device, the total number of the third section of water penetrating device is provided with 6 sections of water penetrating device installation positions, and each section of water penetrating device and the slow cooling device can be used interchangeably.
The process principle of the method is as follows: through rolling control and cooling control, the finished product deformed steel bar meets the requirements of the new national standard on metallographic structure and performance, and the specific process principle is as follows:
(1) the deformation of the rolled piece is 40-50% in the rough rolling stage, the deformation of the rolled piece is 30-40% in the intermediate mill set, and the first water-through cooling is completed in the intermediate mill set, so that the surface temperature of the rolled piece is reduced to 870-910 ℃ from 1020-1060 ℃, and the temperature reduction amplitude is more than or equal to 150 ℃; this is mainly due to the fact that the rod can strongly deform the austenite during the continuous rolling in the recrystallization zone, resulting in very fine austenite grains with a large number of defects. The austenite is subjected to intensive cooling at a constant cooling rate, and rapidly cooled to a temperature near the transformation temperature in a short period of time, thereby suppressing the growth of austenite grains and maintaining the austenite in a hardened state as much as possible.
(2) The deformation of a rolled piece is 10-20% in the finish rolling stage, and aiming at small-specification deformed steel (phi 12-phi 18mm specification double-line and three-line split deformed steel), water-through cooling in finish rolling is adopted (after the finish rolling of a second stage of water-through is completed by a finish rolling unit, the surface temperature of the rolled piece is reduced to 850-900 ℃ from 950-1000 ℃, the temperature reduction amplitude is more than or equal to 100 ℃) and water-through cooling after finish rolling is carried out (after a 18# finish rolling mill is carried out, a post-rolling cooling control device is adjusted, the temperature of the rolled piece is reduced to 780-830 ℃ through the water-through of the third stage, and then the temperature is returned to 800-850 ℃), the operation is mainly due to the fact that the rolled piece is controlled to be lowered into a finish rolling temperature interval in the rolling process, so that more deformation zones are generated in the deformed austenite, the deformed steel has more deformation storage energy, during the subsequent rolling and cooling process, nano-scale particles with dislocation strengthening and second phase strengthening effects are further generated. The temperature of the finished product after rolling is near the phase transition point, and fine hardened austenite grains are converted into ferrite with proper grain size under proper cooling conditions, so that the strength of the deformed steel bar is improved. Meanwhile, the double-line and three-line split deformed steel bar with the specification of phi 12-phi 18mm is divided into two or three rolled pieces after being split, and in order to keep the temperature consistency of the rolled pieces, the water cooling of the second section of finish rolling after being split is increased.
Aiming at large-specification deformed steel (rolled pieces with the specification of phi 20-phi 32 mm), water penetration cooling is only carried out after finish rolling (after the rolled pieces are finish rolled by a finish rolling unit, a post-rolling controlled cooling device is adjusted, the surface temperature of the rolled pieces is directly reduced to 780-830 ℃ from 950-1000 ℃ through water penetration in the third section, and then the temperature is returned to 800-850 ℃), so that operation is mainly that the rolled pieces enter a finish rolling temperature range along with the reduction of the rolled pieces in the rolling process, more deformed strips are generated in deformed austenite, more deformed storage energy is generated in the deformed steel, and nano-scale particles with dislocation strengthening and second-phase strengthening effects are generated in the subsequent rolling and cooling processes. The temperature of the finished product after rolling is near the phase transition point, and fine hardened austenite grains are converted into ferrite with proper grain size under proper cooling conditions, so that the strength of the deformed steel bar is improved. Because the temperature consistency of the single-line rolled piece is better, the second section of finish rolling through-water cooling can be omitted.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts the controlled rolling and controlled cooling and microalloying process, the mechanical property and the metallographic structure of the produced deformed steel bar HRB400E meet the requirements of national standard GB/T1499.2-2018, and the product percent of pass reaches more than 99 percent.
(2) According to different specifications of the deformed steel HRB400E, the invention adopts two-section or three-section water penetration, the deformed steel with phi 12-phi 18mm double-line and three-line cutting adopts three-section water penetration, and the deformed steel with phi 20-phi 32mm adopts two-section water penetration, so that the temperature of each key pass is accurately controlled, the content of trace element V in the steel billet can be reduced, the manufacturing cost is reduced, and the economic benefit of an enterprise is improved.
(3) By reasonably arranging cooling equipment and accurately controlling the temperature of each key pass, the invention solves the problems that the equipment interval of old bar production lines is short (the maximum interval of the central lines of the rolling mills of the rough rolling unit and the middle rolling unit is 3m, the maximum interval of the central lines of the rolling mills of the finishing rolling unit is 4.5m, and the interval from an 18H rolling mill to a 3# flying shear is 24 m), and the cold-controlled rolling process cannot be implemented.
Drawings
FIG. 1 is a process layout diagram of a controlled rolling and cooling production line of examples 1 and 2 of the present invention.
Detailed Description
In order to better explain the technical solution of the present invention, the technical solution of the present invention is further described below with reference to specific examples, which are only exemplary to illustrate the technical solution of the present invention and do not limit the present invention in any way.
Example 1
In this embodiment, the threaded steel HRB400E with a diameter of 12mm is produced by a three-stage controlled rolling and cooling process. The threaded steel HRB400E of the embodiment contains the following chemical elements in percentage by weight: c: 0.24%, Si: 0.45%, Mn: 1.42%, V: 0.008%, P: 0.025%, S: 0.025%, and the balance Fe and inevitable impurities.
Referring to fig. 1, the production process of the deformed steel bar is as follows:
(1) the water penetrating device is provided with: the rolling mill is divided into a roughing mill group, a middle mill group and a finishing mill group, wherein: the roughing mill group is provided with 6 stands of rolling mills which are respectively a 1# rolling mill and a 6# rolling mill, the distance between two adjacent rolling mills is 4000mm, 1# flying shears are arranged behind the 6# rolling mill, the middle rolling mill group is provided with 6 stands of rolling mills which are respectively a 7# rolling mill and a 12# rolling mill, the distance between two adjacent rolling mills of the 7# rolling mill and the 11# rolling mill is 3000mm, the distance between the 11# rolling mill and the 12# rolling mill is 4500mm, 2# flying shears are arranged behind the 12# rolling mill, the finishing mill group is provided with 6 stands of rolling mills which are respectively a 13# rolling mill and a 18# rolling mill, the distance between two adjacent rolling mills is 4500mm, and a 3# flying shears are arranged at a position 24 meters away from the 18# rolling mill; arranging a first section of water penetrating device (a single line, 1 section and 2.5m long) between a middle rolling mill set 11# rolling mill and a 12# rolling mill, arranging a second section of water penetrating device (a three line, 1 section and 3m long) between a finishing rolling mill set 16# rolling mill and a finishing rolling mill set 17# rolling mill, and arranging a third section of water penetrating device (a three line water penetrating device and a slow cooling device, 6 sections and 1.5m long per section) between a finishing rolling mill set 18# rolling mill and a 3# flying shear;
(2) conveying the steel blank to a front roller way of a rolling mill in a steel rolling workshop by using steelmaking continuous casting red, wherein the temperature of the steel blank is 900-1000 ℃; (3) the deformation of the steel billet passing through the rough rolling mill set is 42.5 percent, the deformation of the middle rolling mill set is 37.5 percent, and the deformation of the finishing rolling mill set is 20 percent;
(3) after the rolled piece is subjected to middle rolling for a section of pre-water penetration in a middle rolling mill set, reducing the temperature of the rolled piece from 1020-1040 ℃ to 870-890 ℃; after the rolled piece finishes finish rolling in the second section of water penetration in the finishing mill group, reducing the temperature of the rolled piece from 950-970 ℃ to 850-870 ℃; and after the rolled piece is completely finish rolled and rolled by the rolling mill, adjusting a post-rolling cooling control device, and passing water in a third section to reduce the surface temperature of the rolled piece to 780-800 ℃, and then returning the temperature to 800-820 ℃ in a cooling bed.
Example 2
In this embodiment, the threaded steel HRB400E with a diameter of 16mm is produced by a three-stage controlled rolling and cooling process. The threaded steel HRB400E of the embodiment contains the following chemical elements in percentage by weight: c: 0.22%, Si: 0.50%, Mn: 1.45%, V: 0.010%, P: 0.025%, S: 0.025%, and the balance Fe and inevitable impurities.
Referring to fig. 1, the production process of the deformed steel bar is as follows:
(1) the water penetrating device is provided with: the rolling mill is divided into a roughing mill group, a middle mill group and a finishing mill group, wherein: the roughing mill group is provided with 6 stands of rolling mills which are respectively a 1# rolling mill and a 6# rolling mill, the distance between two adjacent rolling mills is 4000mm, 1# flying shears are arranged behind the 6# rolling mill, the middle rolling mill group is provided with 6 stands of rolling mills which are respectively a 7# rolling mill and a 12# rolling mill, the distance between two adjacent rolling mills of the 7# rolling mill and the 11# rolling mill is 3000mm, the distance between the 11# rolling mill and the 12# rolling mill is 4500mm, 2# flying shears are arranged behind the 12# rolling mill, the finishing mill group is provided with 6 stands of rolling mills which are respectively a 13# rolling mill and a 18# rolling mill, the distance between two adjacent rolling mills is 4500mm, and a 3# flying shears are arranged at a position 24 meters away from the 18# rolling mill; arranging a first section of water penetrating device (a single line, 1 section and 2.5m long) between a middle rolling mill set 11# rolling mill and a 12# rolling mill, arranging a second section of water penetrating device (a second line, 1 section and 3m long) between a finishing rolling mill set 16# rolling mill and a finishing rolling mill set 17# rolling mill, and arranging a third section of water penetrating device (a second line of water penetrating device and a slow cooling device, 6 sections and 1.5m long) between a finishing rolling mill set 18# rolling mill and a 3# flying shear after finishing rolling;
(2) conveying the steel blank to a front roller way of a rolling mill in a steel rolling workshop by using steelmaking continuous casting red, wherein the temperature of the steel blank is 900-1000 ℃; the deformation of the steel billet passing through the rough rolling mill set is 44%, the deformation of the intermediate rolling mill set is 38% and the deformation of the finishing rolling mill set is 18%;
(3) after the rolled piece is subjected to middle rolling for a section of pre-water penetration in a middle rolling mill set, reducing the temperature of the rolled piece from 1030-1050 ℃ to 880-900 ℃; after the rolled piece finishes finish rolling in the second section of water penetration in the finishing mill group, reducing the temperature of the rolled piece from 960-980 ℃ to 860-880 ℃; and after the rolled piece is completely finish rolled by the rolling mill, adjusting a post-rolling cooling control device, and passing water in the third section to reduce the temperature of the rolled piece to 790-810 ℃ and then returning the temperature to 810-830 ℃ in a cooling bed.
Example 3
In this embodiment, the threaded steel HRB400E with a diameter of 28mm is produced by a two-stage controlled rolling and cooling process. The threaded steel HRB400E of the embodiment contains the following chemical elements in percentage by weight: c: 0.24%, Si: 0.42%, Mn: 1.44%, V: 0.015%, P: 0.028%, S: 0.025%, and the balance Fe and inevitable impurities.
The production process of the deformed steel bar comprises the following steps:
(1) the water penetrating device is provided with: the rolling mill is divided into a roughing mill group, a middle mill group and a finishing mill group, wherein: the roughing mill group is provided with 6 stands of rolling mills which are respectively a 1# rolling mill and a 6# rolling mill, the distance between two adjacent rolling mills is 4000mm, 1# flying shears are arranged behind the 6# rolling mill, the middle rolling mill group is provided with 6 stands of rolling mills which are respectively a 7# rolling mill and a 12# rolling mill, the distance between two adjacent rolling mills of the 7# rolling mill and the 11# rolling mill is 3000mm, the distance between the 11# rolling mill and the 12# rolling mill is 4500mm, 2# flying shears are arranged behind the 12# rolling mill, the finishing mill group is provided with 6 stands of rolling mills which are respectively a 13# rolling mill and a 18# rolling mill, the distance between two adjacent rolling mills is 4500mm, and a 3# flying shears are arranged at a position 24 meters away from the 18# rolling mill; a first section of water penetrating device (a single line, 1 section and 2.5m long) is arranged between a 11# rolling mill and a 12# rolling mill of a medium rolling mill group, and a third section of water penetrating device (the single line water penetrating device and a slow cooling device, 6 sections and 1.5m long each section) is arranged between a 18# rolling mill and a 3# flying shear after finish rolling;
(2) conveying the steel blank to a front roller way of a rolling mill in a steel rolling workshop by using steelmaking continuous casting red, wherein the temperature of the steel blank is 900-1000 ℃; the deformation of the steel billet passing through the rough rolling mill set is 45 percent, the deformation of the intermediate rolling mill set is 39 percent, and the deformation of the finishing rolling mill set is 16 percent;
(3) after the rolled piece is subjected to middle rolling for a section of pre-water penetration in a middle rolling mill set, reducing the temperature of the rolled piece from 1040-1060 ℃ to 890-910 ℃; and after the rolled piece is subjected to all finish rolling in the rolling mill, adjusting a post-rolling cooling control device, passing water in the second section to reduce the temperature of the rolled piece to 800-830 ℃, and then returning the temperature to 830-850 ℃ in a cooling bed.
Example 4
In this embodiment, the threaded steel HRB400E with a diameter of 32mm is produced by a two-stage controlled rolling and cooling process. The threaded steel HRB400E of the embodiment contains the following chemical elements in percentage by weight: c: 0.25%, Si: 0.40%, Mn: 1.40%, V: 0.013%, P: 0.028%, S: 0.025%, and the balance Fe and inevitable impurities.
The production process of the deformed steel bar comprises the following steps:
(2) the water penetrating device is provided with: the rolling mill is divided into a roughing mill group, a middle mill group and a finishing mill group, wherein: the roughing mill group is provided with 6 stands of rolling mills which are respectively a 1# rolling mill and a 6# rolling mill, the distance between two adjacent rolling mills is 4000mm, 1# flying shears are arranged behind the 6# rolling mill, the middle rolling mill group is provided with 6 stands of rolling mills which are respectively a 7# rolling mill and a 12# rolling mill, the distance between two adjacent rolling mills of the 7# rolling mill and the 11# rolling mill is 3000mm, the distance between the 11# rolling mill and the 12# rolling mill is 4500mm, 2# flying shears are arranged behind the 12# rolling mill, the finishing mill group is provided with 6 stands of rolling mills which are respectively a 13# rolling mill and a 18# rolling mill, the distance between two adjacent rolling mills is 4500mm, and a 3# flying shears are arranged at a position 24 meters away from the 18# rolling mill; a first section of water penetrating device (a single line, 1 section and 2.5m long) is arranged between a 11# rolling mill and a 12# rolling mill of a medium rolling mill group, and a third section of water penetrating device (the single line water penetrating device and a slow cooling device, 6 sections and 1.5m long each section) is arranged between a 18# rolling mill and a 3# flying shear after finish rolling;
(2) conveying the steel blank to a front roller way of a rolling mill in a steel rolling workshop by using steelmaking continuous casting red, wherein the temperature of the steel blank is 900-1000 ℃; the deformation of the steel billet passing through the rough rolling mill set is 47 percent, the deformation of the intermediate rolling mill set is 40 percent, and the deformation of the finishing rolling mill set is 13 percent;
(3) after the rolled piece is subjected to middle rolling for a section of pre-water penetration in a middle rolling mill set, reducing the temperature of the rolled piece from 1040-1060 ℃ to 890-910 ℃; and after the rolled piece is subjected to all finish rolling in the rolling mill, adjusting a post-rolling cooling control device, passing water in the second section to reduce the temperature of the rolled piece to 800-830 ℃, and then returning the temperature to 830-850 ℃ in a cooling bed.
The 4 specifications of deformed steel bars are manufactured according to the production method of the anti-seismic deformed steel bar HRB400E provided by the invention, and the mechanical properties and the metallographic structure are shown in the following table 1 through detection:
table 1: metallographic structure and performance test results of various examples
The production method of the anti-seismic deformed steel bar HRB400E provided by the invention is described in detail above, and as can be seen from the above table 1, the production method provided by the invention is adopted for production, although only V alloy is adopted in the chemical composition of the deformed steel bar, and the content of the V alloy is only 0.005-0.015%, the adopted controlled rolling and controlled cooling process is reasonable, the metallographic structures of the produced deformed steel bar are both F + P, the mechanical properties all meet the new national standard requirements, and the production cost is low (the production cost per ton of steel is about 32 yuan lower than that of high alloy).
The foregoing embodiments are illustrative of the principles and implementations of the present invention, and the above description of the embodiments is provided only to facilitate the understanding of the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (3)
1. A production method of anti-seismic deformed steel bar HRB400E is characterized in that the deformed steel bar HRB400E contains the following chemical elements in percentage by weight: c: 0.22 to 0.25%, Si: 0.40 to 0.50%, Mn: 1.40-1.45%, V: 0.005-0.015%, P is less than or equal to 0.045%, S is less than or equal to 0.045%, and the balance is Fe and inevitable impurity, its characterized in that: the production process of the deformed steel HRB400E comprises the following steps:
(1) the water penetrating device is provided with: the rolling mill is divided into a roughing mill group, a middle mill group and a finishing mill group, wherein: the roughing mill is provided with 6 stands of rolling mills, namely a 1# rolling mill and a 6# rolling mill respectively, 1# flying shears are arranged behind the 6# rolling mill, the middle rolling mill is provided with 6 stands of rolling mills, namely a 7# rolling mill and a 12# rolling mill respectively, 2# flying shears are arranged behind the 12# rolling mill, the finishing mill is provided with 6 stands of rolling mills, namely a 13# rolling mill and a 18# rolling mill respectively, and 3# flying shears are arranged at a position 24 meters away from the 18# rolling mill; a first section of water penetrating device is arranged between a 11# rolling mill and a 12# rolling mill of a middle rolling mill group, a second section of water penetrating device is arranged between a 16# rolling mill and a 17# rolling mill of a finishing rolling mill group, and a third section of water penetrating device is arranged between a 18# rolling mill of finishing rolling and a 3# flying shear;
(2) controlling rolling: the deformation of the rolled piece in the rough rolling unit is 40-50%, the deformation of the rolled piece in the intermediate rolling unit is 30-40%, and the deformation of the rolled piece in the finishing rolling unit is 10-20%;
(3) and (3) controlling cooling: according to the specification of the finished threaded steel HRB400E, two-section water penetration or three-section water penetration is adopted; the method comprises the following steps: cooling the double-line and three-line split deformed steel bar with the specification of phi 12-phi 18mm by three-section water penetration, and reducing the surface temperature of a rolled piece from 1020-1060 ℃ to 870-910 ℃ after the rolled piece is subjected to middle rolling for one-section pre-water penetration in a middle rolling mill set, wherein the temperature reduction amplitude is more than or equal to 150 ℃; after the rolled piece finishes finish rolling in the second section of water penetration in the finishing mill group, reducing the surface temperature of the rolled piece from 950-1000 ℃ to 850-900 ℃, wherein the temperature reduction amplitude is more than or equal to 100 ℃; after the rolled piece passes through a finish rolling 18# rolling mill, water is penetrated in the third section to reduce the surface temperature of the rolled piece to 780-830 ℃, and then the temperature of the rolled piece is returned to 800-850 ℃ in a cooling bed; cooling rolled pieces with the specification of phi 20-32 mm by adopting two-section water penetration, namely cooling by adopting only a first section water penetration device and a third section water penetration device; after the rolled piece is subjected to intermediate rolling in the intermediate rolling mill unit for a section of pre-water penetration, the surface temperature of the rolled piece is reduced to 870-910 ℃ from 1020-1060 ℃, the temperature reduction amplitude is larger than or equal to 150 ℃, after the rolled piece is subjected to finish rolling in the finishing rolling mill unit, a post-rolling cooling control device is adjusted, the water penetration in the third section is carried out to directly reduce the surface temperature of the rolled piece from 950-1000 ℃ to 780-830 ℃, and then the temperature of the rolled piece is returned to 800-850 ℃ in a cooling bed.
2. The production method of the anti-seismic deformed steel bar HRB400E as claimed in claim 1, wherein the production method comprises the following steps: the distance between two adjacent rolling mills of the roughing mill group 1# to 6# rolling mill is 4000mm, the distance between two adjacent rolling mills of the intermediate mill group 7# to 11# rolling mill is 3000mm, the distance between 11# rolling mill and 12# rolling mill is 4500mm, and the distance between two adjacent rolling mills of the finishing mill group 13# to 18# rolling mill is 4500 mm.
3. The production method of the anti-seismic deformed steel bar HRB400E as claimed in claim 1, wherein the production method comprises the following steps: the first section of water penetrating device is a single-wire water penetrating device and is only provided with one section of water penetrating device; the second section of water penetrating device is a double-line or three-line water penetrating device, and only one section of water penetrating device is arranged; the third section of water penetrating device is a single-line or double-line or three-line water penetrating device or a slow cooling device, the total number of the third section of water penetrating device is provided with 6 sections of water penetrating device installation positions, and each section of water penetrating device and the slow cooling device can be used interchangeably.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113814281A (en) * | 2021-09-03 | 2021-12-21 | 广西钢铁集团有限公司 | Cost-reducing segmented cooling control method for hot-rolled ribbed steel bar |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004001068A (en) * | 2002-04-12 | 2004-01-08 | Nippon Steel Corp | Method for rolling plate |
| CN1792484A (en) * | 2005-12-26 | 2006-06-28 | 广州双菱钢铁工业有限公司 | Method for producing 500 Mpa high strengh threaded reinforced bar |
| CN101275197A (en) * | 2007-07-19 | 2008-10-01 | 天津钢铁有限公司 | High-strength rebar and manufacturing process thereof |
| CN203991658U (en) * | 2014-06-27 | 2014-12-10 | 陕西钢铁集团有限公司 | A kind of high strength cast iron production system |
| CN104307890A (en) * | 2014-11-13 | 2015-01-28 | 攀枝花钢城集团有限公司 | Combined controlled rolling and cooling production technology of HRB400 hot rolled ribbed steel bars |
| CN105057356A (en) * | 2015-08-05 | 2015-11-18 | 中冶华天工程技术有限公司 | Process for producing screw-thread steel through two-stage rolling control and after-rolling cooling control |
| KR101804941B1 (en) * | 2016-11-11 | 2017-12-05 | 동국제강주식회사 | Rebar having excellent yield ratio and elongation and manufacturing method thereof |
| KR20190058046A (en) * | 2017-11-21 | 2019-05-29 | 현대제철 주식회사 | Steel reinforcement and method of manufacturing the same |
| CN110170523A (en) * | 2019-05-20 | 2019-08-27 | 北京科技大学 | A kind of low energy consumption controlled rolling method of hot rolled ribbed bars |
| CN111360066A (en) * | 2020-02-21 | 2020-07-03 | 中冶赛迪工程技术股份有限公司 | Low-cost, less-red-rust, high-strength and anti-seismic deformed steel bar production method and system |
| CN112090960A (en) * | 2020-09-14 | 2020-12-18 | 中冶南方武汉钢铁设计研究院有限公司 | Method for producing 400-500 MPa high-strength anti-seismic deformed steel bar by non-heating low-temperature slitting rolling |
-
2021
- 2021-06-09 CN CN202110643112.9A patent/CN113319121B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004001068A (en) * | 2002-04-12 | 2004-01-08 | Nippon Steel Corp | Method for rolling plate |
| CN1792484A (en) * | 2005-12-26 | 2006-06-28 | 广州双菱钢铁工业有限公司 | Method for producing 500 Mpa high strengh threaded reinforced bar |
| CN101275197A (en) * | 2007-07-19 | 2008-10-01 | 天津钢铁有限公司 | High-strength rebar and manufacturing process thereof |
| CN203991658U (en) * | 2014-06-27 | 2014-12-10 | 陕西钢铁集团有限公司 | A kind of high strength cast iron production system |
| CN104307890A (en) * | 2014-11-13 | 2015-01-28 | 攀枝花钢城集团有限公司 | Combined controlled rolling and cooling production technology of HRB400 hot rolled ribbed steel bars |
| CN105057356A (en) * | 2015-08-05 | 2015-11-18 | 中冶华天工程技术有限公司 | Process for producing screw-thread steel through two-stage rolling control and after-rolling cooling control |
| KR101804941B1 (en) * | 2016-11-11 | 2017-12-05 | 동국제강주식회사 | Rebar having excellent yield ratio and elongation and manufacturing method thereof |
| KR20190058046A (en) * | 2017-11-21 | 2019-05-29 | 현대제철 주식회사 | Steel reinforcement and method of manufacturing the same |
| CN110170523A (en) * | 2019-05-20 | 2019-08-27 | 北京科技大学 | A kind of low energy consumption controlled rolling method of hot rolled ribbed bars |
| CN111360066A (en) * | 2020-02-21 | 2020-07-03 | 中冶赛迪工程技术股份有限公司 | Low-cost, less-red-rust, high-strength and anti-seismic deformed steel bar production method and system |
| CN112090960A (en) * | 2020-09-14 | 2020-12-18 | 中冶南方武汉钢铁设计研究院有限公司 | Method for producing 400-500 MPa high-strength anti-seismic deformed steel bar by non-heating low-temperature slitting rolling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113814281A (en) * | 2021-09-03 | 2021-12-21 | 广西钢铁集团有限公司 | Cost-reducing segmented cooling control method for hot-rolled ribbed steel bar |
| CN113814281B (en) * | 2021-09-03 | 2024-02-06 | 广西钢铁集团有限公司 | Cost-reducing sectional cooling control method for hot rolled ribbed steel bar |
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|---|---|
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