CN113546960A - Micro-alloying-free rolling and cooling control method for slitting rolling of bar deformed steel bar - Google Patents
Micro-alloying-free rolling and cooling control method for slitting rolling of bar deformed steel bar Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 136
- 238000001816 cooling Methods 0.000 title claims abstract description 70
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 26
- 230000008859 change Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000004321 preservation Methods 0.000 claims abstract description 4
- 229910000734 martensite Inorganic materials 0.000 claims description 14
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 28
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 229910045601 alloy Inorganic materials 0.000 abstract description 6
- 239000000956 alloy Substances 0.000 abstract description 6
- 229910052758 niobium Inorganic materials 0.000 abstract description 5
- 229910052719 titanium Inorganic materials 0.000 abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 abstract description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 239000002344 surface layer Substances 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 239000010955 niobium Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004925 denaturation Methods 0.000 description 2
- 230000036425 denaturation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005088 metallography Methods 0.000 description 1
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- 230000006911 nucleation Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
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- 239000006104 solid solution Substances 0.000 description 1
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- 230000035882 stress Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- B21B15/0007—Cutting or shearing the product
-
- 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
-
- 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
- B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a microalloying-free rolling and cooling control method for slitting and rolling of bar deformed steel bars, belongs to the technical field of deformed steel bar production, and relates to a microalloying-free rolling process. A micro-alloying-free rolling and cooling control method for slitting and rolling of bar deformed steel bars comprises the following steps: (1) high-temperature rolling: high-temperature rolling at the temperature of 1000 ℃ and 1050 ℃; (2) critical austenite zone controlled rolling: controlling the finish rolling temperature to 750-; (3) cooling after rolling: water cooling in 3 grades after rolling; (4) the cold bed is added with a heat preservation cover to control phase change. The invention breaks the traditional process layout and the controlled rolling and controlled cooling layout of the splitting rolling finishing mill set, and realizes the smooth production of the HRB400E microalloy-free fine grain steel rolled by the bars by means of the finish rolling and controlled rolling, the graded cooling process after rolling, the controlled phase change of a cooling bed and the like; saves a large amount of noble and rare alloys of Nb, V and Ti, and can reduce the cost per ton of steel by more than 200 yuan.
Description
Technical Field
The invention belongs to the technical field of deformed steel bar production, relates to a microalloy-free rolling process, and particularly relates to a microalloy-free rolling and cooling control method for slitting and rolling of bar deformed steel bars.
Background
The technological process of HRB400 (three-level deformed steel bar) and HRB400E (three-level anti-seismic deformed steel bar) steel bar is that the cast steel billet is heated and then passes through the rough mill group, the intermediate mill group and the finishing mill group in sequence and then reaches the cooling bed. In order to achieve the mechanical property of the steel bar reaching the standard at 400MPa and above, micro alloy elements such as Nb, V, Ti and the like must be added in the conventional process, and the property of the steel bar is improved by changing the intrinsic coarse grain steel into the intrinsic fine grain steel, namely, the property of the alloy is utilized. However, since microalloy belongs to rare alloy, the cost is high, and the use of a large amount of alloy is not favorable for the reasonable utilization of resources, does not meet the current resource-saving development mode of industrial requirements, and is not favorable for the target of sustainable development, the development of the microalloy-free controlled rolling and cooling process on the basis of the bar cutting process is a research hotspot at present.
In the research and development process of the microalloying-free controlled rolling and controlled cooling process, the controlled rolling and controlled cooling process is difficult to implement on the bar slitting process due to the limitations of the slitting rolling process arrangement, the slitting roller material, the slitting guide material and the slitting process. In order to solve the problem, some manufacturers basically control the controlled rolling at the temperature that austenite is not in a crystallization area for ensuring the service life of a slitting roller and a guide and production sequence during slitting and controlled rolling, but the grain refining effect of the method is very limited.
The traditional controlled rolling and controlled cooling process for low-temperature start rolling is easy to realize on high-speed line import equipment, the process realizes low-temperature start rolling and rolling of a critical austenite area of a finishing mill group on the basis of importing high-speed line heavy equipment, deformation is promoted to induce ferrite phase change through the high strain rate of the high-speed line finishing mill group, and fine grain rolling is realized by matching with air cooling line structure phase change control. However, the traditional bar production line is limited in equipment capacity, so that low-temperature rolling (900 ℃ C. and 950 ℃ C.) cannot be realized, and the original austenite grains are coarse, which brings difficulty to subsequent controlled rolling. When the rolling is controlled, if the rolling is carried out according to four ideal finishing passes, the 4-pass final rolling process layout is difficult to realize due to the limitation of the material of the splitting roller and the service life of the splitting guide.
Conventional bar line process layout: high-temperature initial rolling (1000-; however, when the process is used for rolling the hot-rolled steel bar with the pressure of more than 400MPa, the niobium/vanadium/titanium microalloy is required to be added, and the strength is improved by utilizing the solid solution strengthening, the fine grain strengthening and the precipitation strengthening of the microalloy, but the aim of no microalloying cannot be achieved, and the production cost is high.
The process layout of the waste heat treatment bar wire comprises the following steps: high-temperature initial rolling (1000-; the process can be used for rolling the hot-rolled steel bar with the pressure of more than 400MPa without adding niobium/vanadium/titanium microalloy, and the process is low in production cost because the structure-strengthened surface layer tempered martensite, the core ferrite + pearlite and the transition region are used for forming; however, the process can not meet the requirements of GB1499.2-2018 hot-rolled ribbed steel bars on harmful structures such as tempered martensite and the like, and in addition, the shock resistance is poor, and the welding performance can not be met. Three stages of waste heat treatment: the first stage is the steel bar surface quenching martensite stage. After leaving the finishing mill, the steel bar enters the high-efficiency cooling device for rapid cooling as soon as possible at the finish rolling temperature, the surface temperature is rapidly reduced to be below the martensite transformation temperature (Ms), and the transformation from austenite to martensite is generated. The inside is still in an austenite state due to high temperature, and the surface layer is a martensite and residual austenite structure. The second stage is an auto-tempering stage. After the steel bar is rapidly cooled in the first stage, the steel bar is air-cooled on a cooling bed. Because the temperature difference of each point on the cross section of the steel bar is large due to the rapid cooling in the first stage, the heat of the core part is diffused to the surface layer to form the self-tempering of martensite, the tempered martensite or tempered sorbite can be obtained according to the self-tempering temperature, the residual austenite on the surface is converted into the martensite, the transition layer close to the surface layer is converted into the bainite, troostite or sorbite according to the different components and cooling conditions of the steel. The core is still in the austenitic state. The third stage is the core austenite transformation stage of the steel bar. After the steel bar is air-cooled on the cooling bed for a period of time, the temperature on the cross section tends to be consistent, and simultaneously the temperature is reduced to reach the austenite transformation temperature, the phase transformation is started, and according to the components of the steel, the diameter of the steel bar and the cooling effect of the previous stage, the core part is transformed into ferrite and pearlite or sorbite or bainite tissues.
Aiming at the problems that a lot of microalloy is used in the production process of the deformed steel bar and the existing microalloy-free rolling process has the defects, a microalloy-free rolling and cooling control method for slitting and rolling the deformed steel bar is developed.
Disclosure of Invention
The invention aims to provide a micro-alloying-free rolling and cooling control method for slitting and rolling of bar deformed steel bars.
The invention is realized by the following technical scheme:
a micro-alloying-free rolling and cooling control method for slitting and rolling of bar deformed steel bars comprises the following steps:
(1) high-temperature rolling: high-temperature rolling at the temperature of 1000 ℃ and 1050 ℃;
(2) critical austenite zone controlled rolling: controlling the finish rolling temperature to 750-;
(3) cooling after rolling: water cooling in 3 grades after rolling;
(4) the cold bed is added with a heat preservation cover to control phase change.
Furthermore, the critical austenite region controlled rolling adopts an arrangement structure of 6 frames of rough rolling, 6 frames of medium rolling, 2 frames of pre-finish rolling and 2 frames of finish rolling.
The cold area after rolling adopts an arrangement structure of I group of water cooling and temperature equalizing, II group of water cooling and temperature equalizing.
The cooling speed of each stage of cooling after rolling is less than the critical cooling speed, and abnormal structures such as tempered martensite and the like are prevented.
Cooling to 700-800 ℃ after rolling.
The temperature of the heat-preserving cover is 500-600 ℃, the phase change is controlled, and meanwhile, the stress is eliminated and the aging is reduced.
The method of the invention carries out conventional hot rolling and initial rolling at 1050 ℃ with the temperature of 1000-. The method completely realizes the online application of the microalloy-free controlled rolling and controlled cooling process of the HRB400E phi 12-phi 25 deformed steel bar, the structure completely meets the requirements of GB1499.2-2018, and the stable production of slitting rolling is realized.
On the premise of the smooth production of splitting rolling, the critical austenite region controlled rolling is considered at the same time, the allowable conditions of the material quality, the guide service life and the like of the conventional splitting rolling roller are met, the controlled rolling is adopted after a splitting pass, meanwhile, enough distance is reserved when the cooling section enters a finishing mill, so that the cooled rolled piece is ensured to ensure that the temperature of the whole section is uniform through recovery, the rolled piece enters a finishing pass for forming to further refine grains, finishing rolling is finished at the temperature of 750 plus 850 ℃, phase change is guided by deformation under the action of denaturation energy, and austenite grains are flattened, elongated and are recrystallized to generate finer austenite grains; along with the change of austenite, the ferrite starts to be on the austenite grain boundary, more nucleation points are obtained, conditions are created for refining ferrite grains, primary cooling (controlled rolling austenite grains are long), temperature return (1S-1.5S uniform section temperature), secondary cooling (phase change tissue is single, no martensite appears), phase change is controlled by a cooling bed (phase change is more sufficient), and the controlled rolling and controlled cooling process is completed; the process has the difficulty that the cutting strip is easy to have folding defects when the controlled rolling is carried out after the cutting; the line number after the cutting is large, the line number is uneven and deformed, the distance between the line number and the finishing mill after the cutting is far, the probability of curve walking is increased, and steel piling is easy to occur in a controlled rolling section; the head temperature after cooling is low and uneven deformation after cutting causes difficult biting, and accidents such as the top outlet of the bent head of the finished product rack and the like occur frequently.
On the premise of smooth production of splitting rolling, the invention simultaneously considers the two-phase region controlled rolling and meets the allowable conditions of the material quality, the guide service life and the like of the existing splitting rolling roller, the controlled rolling is adopted after a splitting pass, meanwhile, a sufficient distance is reserved when the cooling section enters a finishing mill to ensure that the temperature of the whole section is uniform through reversion of the cooled rolled piece, then the rolled piece enters the finishing pass for forming to further refine grains at 750 ℃ and 850 ℃ to finish the finish rolling, the austenite grains are flattened and elongated under the action of denaturation energy to guide phase change, and the austenite grains are recrystallized to generate finer austenite grains; with the austenite change, ferrite starts on austenite grain boundaries, and a more nucleated point is obtained.
According to the invention, through reasonable process layout, optimization of controlled rolling and controlled cooling parameters, investment of a head non-cooling section, optimization of a splitting hole pattern, exploration of a material type and exploration of a finish rolling roller material and a guide material, stable production is realized at present, and simultaneously, the requirements of GB1499.2-2018 on the mechanical property and the structure of HRB400E are met under the process conditions of starting rolling of a microalloy-free billet in a conventional hot rolling process, controlled rolling and controlled cooling, phase change control of a cooling bed after rolling and the like. The method completely realizes the online application of the microalloy-free controlled rolling and controlled cooling process of the HRB400E phi 12-phi 25 deformed steel bar, the structure completely meets the requirements of GB1499.2-2018, and the stable production of slitting rolling is realized.
Compared with the prior art, the invention has the following advantages:
(1) the traditional process layout and the controlled rolling and controlled cooling layout of a slitting rolling finishing mill set are broken through, and the smooth production of the HRB400E microalloy-free fine grain steel bar by slitting rolling of the bar is realized through the means of finish rolling and controlled rolling, the graded cooling process after rolling, the cold bed controlled phase change and the like;
(2) saves a large amount of noble and rare alloys of Nb, V and Ti, and can reduce the cost per ton of steel by more than 200 yuan.
Drawings
FIG. 1 is a graph showing the relationship between the temperature and the position of a rolling mill in the rolling process of example 1;
FIG. 2 is a macroscopic cross-section of controlled rolling and cooling in example 1;
FIG. 3 is a conventional macroscopic cross-section after strong through water cooling after rolling;
FIG. 4 is a graph showing the results of microstructure examination of the deformed steel bar of example 1.
Detailed Description
A micro-alloying-free rolling and cooling control method for slitting and rolling of bar deformed steel bars comprises the following steps:
(1) high-temperature rolling: high-temperature rolling at the temperature of 1000 ℃ and 1050 ℃;
(2) critical austenite zone controlled rolling: adopting an arrangement structure of 6 frames of rough rolling, 6 frames of middle rolling, 2 frames of pre-finish rolling and 2 frames of finish rolling, and controlling the finish rolling temperature to be 750-;
(3) cooling after rolling: after rolling, 3 grades of water cooling are carried out, the temperature is cooled to 700 ℃ and 800 ℃, and an arrangement structure of I group water cooling, temperature equalization, II group water cooling and temperature equalization is adopted;
(4) the temperature of the heat preservation cover is controlled to be 500-600 ℃, and the phase change is controlled.
According to the detection, the post-fracture elongation of the deformed steel bar is more than or equal to 20 percent, the maximum force total elongation is more than or equal to 14 percent, the strength-to-yield ratio is more than or equal to 1.30, the yield-to-yield ratio is less than or equal to 1.20, and the cold bending performance and the reverse bending performance can meet the national standard GB 1499.2-2018; wherein the relationship between the temperature and the position of the rolling mill in the rolling process is shown in figure 1, the main chemical composition and the range of the deformed steel bar are shown in table 1,
TABLE 1 chemical composition and ranges
Metallographic structure detection is carried out on the threaded rod prepared by the method
First, macroscopic metallographic phase
The macroscopic cross section of the deformed steel bar prepared by the method is shown in figure 2, and the dynamic recrystallization of ferrite can be found out by hot-machine rolling, the growth of ferrite grains can be inhibited by fast cooling after rolling, the surface layer is always a fine-grain ferrite structure, and the ultra-fine ferrite structure of the surface layer can improve the cold bending property, the toughness and the fatigue property besides the yield strength; the cross section of the conventional screw-thread steel produced by water cooling after rolling is shown in fig. 3, and it can be seen from fig. 3 that austenite-martensite phase transformation occurs to form a martensite surface layer.
Second, Vickers hardness of cross section
The metallographic structure ferrite plus pearlite prepared by the process has the grain size of 9-10 grades and no other abnormal structures, the microhardness of three batches of phi 16 in 10 months in 2020 is sampled and detected, the microhardness is all in the range of national standard 40HV, and the table 2 shows the sampled and detected result.
TABLE 22020 years 10 months microscopic metallography examination result
| Batches of | Centre HV0 | Edge part HV | HV- HV0 |
| B19021082 | 230 | 247 | 17 |
| B19021023 | 214 | 238 | 14 |
| B19021045 | 203 | 207 | 4 |
Third, microstructure
The microstructure of the deformed steel bar prepared by the process is detected, and the result is shown in 3.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (6)
1. A micro-alloying-free rolling and cooling control method for slitting and rolling of bar deformed steel bars is characterized by comprising the following steps:
(1) high-temperature rolling: high-temperature rolling at the temperature of 1000 ℃ and 1050 ℃;
(2) critical austenite zone controlled rolling: controlling the finish rolling temperature to 750-;
(3) cooling after rolling: water cooling in 3 grades after rolling;
(4) the cold bed is added with a heat preservation cover to control phase change.
2. The micro-alloying rolling control and cooling method for slit rolling of the bar deformed steel bar as claimed in claim 1, wherein the critical austenite zone control rolling adopts an arrangement structure of 6 frames of rough rolling, 6 frames of medium rolling, 2 frames of pre-finish rolling and 2 frames of finish rolling.
3. The micro-alloying-free rolling and cooling control method for slitting and rolling the deformed steel bar as claimed in claim 1, wherein the cold zone after rolling adopts an arrangement structure of group I water cooling + temperature equalization + group II water cooling + temperature equalization.
4. The method of claim 1, wherein the cooling rate of each stage of cooling after rolling is less than a critical cooling rate to prevent abnormal structures such as tempered martensite.
5. The method as claimed in claim 1, wherein the cooling of the deformed bar is controlled by cooling to 700-800 ℃ after rolling.
6. The method as claimed in claim 1, wherein the temperature of the heat-preserving cover is 500-600 ℃ and the phase change is controlled.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114453437A (en) * | 2022-01-20 | 2022-05-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Controlled cooling production method of hot-rolled steel bar without martensite ring on surface |
| CN114875205A (en) * | 2022-05-27 | 2022-08-09 | 广西柳州钢铁集团有限公司 | Non-microalloy HRB400E hot-rolled ribbed steel bar ordinary-speed bar and production method thereof |
| CN115069781A (en) * | 2022-06-06 | 2022-09-20 | 福建三宝钢铁有限公司 | Controlled rolling and controlled cooling production process of HRB400E nuclear power steel |
| CN117925963A (en) * | 2023-12-14 | 2024-04-26 | 华北理工大学 | Ultra-high-strength plastic ultra-fine bainite finish rolling deformed steel bar and preparation method thereof |
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| CN114875205A (en) * | 2022-05-27 | 2022-08-09 | 广西柳州钢铁集团有限公司 | Non-microalloy HRB400E hot-rolled ribbed steel bar ordinary-speed bar and production method thereof |
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Application publication date: 20211026 |