CN112474831A - Adjusting method for QTB waste heat treatment process of slit rolled deformed steel bar - Google Patents
Adjusting method for QTB waste heat treatment process of slit rolled deformed steel bar Download PDFInfo
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- CN112474831A CN112474831A CN202011410546.6A CN202011410546A CN112474831A CN 112474831 A CN112474831 A CN 112474831A CN 202011410546 A CN202011410546 A CN 202011410546A CN 112474831 A CN112474831 A CN 112474831A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
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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
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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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
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses an adjusting method of a QTB waste heat treatment process of slit rolled deformed steel bar; firstly, redesigning the diameter of the cooling nozzle guide pipe; redesigning gaps among the cooling nozzle, the drying nozzle and the back blowing nozzle; redesigning the arrangement mode of the cooling nozzles and the back-blowing nozzles. According to the invention, the cooling water is ensured to form annular jet by improving the clearance design of the cooling nozzle and the back-blowing nozzle in the QTB water tank for cutting and rolling; the distribution arrangement form of the nozzles is improved, so that the arrangement length of the cooling nozzles is matched with the rolling specification and the strength of the steel bars, stable operation of each red steel bar subjected to cutting and rolling in a channel formed by different cooling nozzle arrangements in a QTB water tank is ensured, and the occurrence of various process accidents such as finish rolling stack tail, QTB cooling shaking stack steel, multiple-length shearing clamp steel, apron board roller way conveying flying steel, cold bed alignment disorder steel, fixed-length shearing head top steel and the like is reduced; the metallographic structure of each deformed steel bar is ensured to be uniform, the performance is stable and the scattering difference is small; the straightness of the bar is ensured; the qualified rate of the high-strength deformed steel bar reaches 100 percent.
Description
Technical Field
The invention belongs to the technical field of deformed steel bar production, and particularly relates to an adjusting method of a QTB (quantitative trait locus) waste heat treatment process for slitting and rolling deformed steel bars.
Background
With the continuous development of science and technology, the proportion of high-strength steel is gradually increased, and the aims of saving energy, saving materials and reducing production cost are fulfilled. The technology of the waste heat treatment after the rolling of the deformed steel bar (the controlled cooling technology) is a new technology developed in the sixties of the 20 th century. Since the beginning of the 20 th century and the 70 th era, the research on the waste heat treatment process of the steel bars began to be carried out in succession in China, and since the 80 th era, dozens of bar continuous rolling production lines equipped with waste heat treatment equipment were introduced from abroad in China. The rod line owned by the applicant is an introduced item in the beginning of the 21 st century, and is provided with a new technology of controlled rolling and controlled cooling so as to meet the sustainable development requirements of energy conservation, environmental protection, resource saving and cost reduction.
The rod line owned by the applicant is provided with a post-rolling control cooling device, namely a QTB waste heat treatment water tank. QTB is an abbreviation of Quenching Tempering Bars, meaning the Quenching and Tempering of Bars; at present, the control cooling of rolled bars in China is usually a turbulent tube cooling type designed by the Bomini company, the cooling capacity of a turbulent tube cooler is strong, and the water-cooling process adopts a control method with large pressure and small flow, so that the advantages of short cooling time, high cooling strength and good cooling effect are achieved; the defects are that the cooling is not uniform, and the surface of the steel bar is easy to generate a shade surface and a sun surface. The other is a QTB quenching tempering box designed by Daneli company, and compared with a Bornini turbulent tube type cooling control process, the water cooling process adopts a small-pressure large-flow control method, and has the advantages that the steel bar is uniformly cooled, and the performance is stable; the defects that a single cooling nozzle and a back-blowing nozzle are arranged according to specifications, the adjustment difficulty is high, and process accidents such as steel piling, tail shaking and the like are easy to generate; in addition, the gap of the cooling nozzle is not well matched with the size of the guide pipe, so that the small-specification deformed steel bars subjected to cutting and rolling are easy to generate wave bending, process accidents such as steel bending and fixed-length cutting of the top head are caused, the production operation rate and the yield are seriously influenced, and the difficulty of the QTB cooling control process technology is solved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an adjusting method of a QTB waste heat treatment process of slit rolled deformed steel bar.
The invention is realized in such a way, the invention relates to an adjusting method of a QTB waste heat treatment process of the slit rolled deformed steel bar; the method is characterized in that: first, the cooling nozzle conduit diameter is redesigned: the diameter of the deformed steel cooling nozzle guide pipe with the phi 10mm specification is optimally designed to be 24mm from the original 20 mm; the diameter of the thread steel cooling nozzle guide pipe with the diameter of more than 14mm is optimally designed to be 32mm from the original 24 mm;
secondly, redesigning the gaps of the cooling nozzle, the drying nozzle and the back blowing nozzle: the size of the gap between the cooling nozzle, the drying nozzle and the back blowing nozzle is adjusted through the thickness of the gasket, and an optimal gasket thickness and gap adjustment scheme of the cooling nozzle, the drying nozzle and the back blowing nozzle are set; firstly, determining a nozzle gap, then selecting the thickness of a gasket, and finally fixing the gasket by using a bolt;
TABLE 1 Cooling nozzle shim thickness vs. gap relationship
| Thickness of gasket/mm | Gap/mm |
| 2 | 0.52 |
| 3 | 0.78 |
| 4 | 1.04 |
| 5 | 1.29 |
| 6 | 1.55 |
| 7 | 1.81 |
| 8 | 2.07 |
| 9 | 2.33 |
Setting the gap of a cooling nozzle to be 2.07mm during slitting rolling, selecting the thickness of a gasket to be 8mm, setting the gap of a back flushing/drying nozzle to be 2.6mm, and selecting the thickness of the gasket to be 7.5 mm;
TABLE 2 Back-flushing/drying nozzle shim and gap relationship
| Thickness of gasket/mm | Gap/mm |
| 1.5 | 0.50 |
| 2.5 | 0.90 |
| 3.5 | 1.20 |
| 4.5 | 1.50 |
| 5.5 | 1.90 |
| 6.5 | 2.20 |
| 7.5 | 2.60 |
Thirdly, redesigning the arrangement mode of the cooling nozzles and the back-blowing nozzles according to the specification, replacing part of the cooling nozzles by a bypass roller way, and determining the length of a water-cooling line;
TABLE 3 arrangement of cooling nozzles and blowback nozzles
In table 3: b is bypass roller way, C is cooling nozzle, D is drying nozzle, S/C is back-blowing/cooling nozzle, 1 is on, and 0 is off.
The invention has the advantages that: according to the invention, the cooling water is ensured to form annular jet by improving the clearance design of the cooling nozzle and the back-blowing nozzle in the QTB water tank for cutting and rolling; the distribution and arrangement form of the nozzles is improved, so that the arrangement length (water cooling line) of the cooling nozzles is matched with the specification and the strength of the steel bars, stable operation of each red steel bar subjected to cutting and rolling in a channel formed by different cooling nozzle arrangements in a QTB water tank is ensured, and the occurrence of various process accidents such as finish rolling pile tail, QTB cooling shaking pile steel, multiple-length shear steel clamping, apron board roller way conveying flying steel, cooling bed alignment disorder steel, fixed-length shear head steel jacking and the like is reduced. And the metallographic structure of each deformed steel bar is ensured to be uniform, the performance is stable and the dispersion is small. After the QTB waste heat treatment process design is optimized, cooling water forms uniform annular turbulence in the nozzle guide pipe, the rod is quickly surrounded by the water when passing through the cooler, the whole surface is uniformly cooled, and a yin-yang cooling surface cannot be formed; the water flow of the back flushing nozzle can completely seal the forward water to prevent water from overflowing from the quenching water tank, the steel bar cannot shake along with overflowing cooling water, and the straightness of the bar is guaranteed. The zero control target of production accidents caused by the QTB heat treatment process is realized, and the performance qualification rate of the high-strength deformed steel bar reaches 100 percent.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An adjusting method of a QTB waste heat treatment process of cut rolled deformed steel bar; the method is characterized in that: firstly, researching the matching relation between the diameter of the nozzle guide pipe and the diameter of the bar, ensuring scientific filling coefficient, optimizing the diameter design of the cooling nozzle guide pipe, and redesigning the diameter of the cooling nozzle guide pipe: the diameter of the deformed steel cooling nozzle guide pipe with the phi 10mm specification is optimally designed to be 24mm from the original 20 mm; the diameter of the thread steel cooling nozzle guide pipe with the diameter of more than 14mm is optimally designed to be 32mm from the original 24 mm; the traction force formed by high-pressure water injection in the cooling nozzle acts on the bar after optimization, so that the bar can stably run in the nozzle channel;
secondly, the most key parameter of the QTB control process is the heat exchange coefficient between the surface of the bar and cooling water; each water cooling line in the water tank consists of a plurality of cooling nozzles and back-blowing/drying nozzles, the rolled piece passing through the water cooling line is cooled, the pressure and the flow of cooling water are determined by the gaps of the cooling nozzles, and the larger the gap is, the smaller the pressure is, and the larger the flow is; adjusting the matched technological parameters of the cooling nozzle such as clearance, flow, pressure and the like, and is a key factor for obtaining ideal mechanical properties; the specific optimization is as follows: redesigning the gaps of the cooling nozzle, the drying nozzle and the back blowing nozzle: the size of the gap between the cooling nozzle, the drying nozzle and the back blowing nozzle is adjusted through the thickness of the gasket, and the optimal proportion is preferably selected through field tests according to a comparison table of the thickness of the gasket and the gap relation between the cooling nozzle, the drying nozzle and the back blowing nozzle; firstly, determining a nozzle gap, then selecting the thickness of a gasket, and finally fixing the gasket by using a bolt;
TABLE 1 Cooling nozzle shim thickness vs. gap Table
TABLE 2 relationship between back-flushing/drying nozzle gasket and clearance
| Thickness of gasket/mm | Gap/mm |
| 1.5 | 0.50 |
| 2.5 | 0.90 |
| 3.5 | 1.20 |
| 4.5 | 1.50 |
| 5.5 | 1.90 |
| 6.5 | 2.20 |
| 7.5 | 2.60 |
The thickness of the cooling nozzle gasket is 6mm, the corresponding nozzle gap is 1.55mm, the thickness of the back-blowing nozzle gasket and the drying nozzle gasket is 2.5mm, and the corresponding gap is 0.9 mm; the thickness of the two-segmentation cooling nozzle gasket is 7mm, the corresponding nozzle gap is 1.81mm, the thickness of the back-blowing nozzle and the drying nozzle gasket is 2.5mm, and the corresponding gap is 0.9 mm. (ii) a The nozzle is produced according to the technological parameters of the originally designed nozzle, and the cooling water quantity of a single nozzle is insufficient, so that the cooling effect is poor; the clearance undersize, it is inhomogeneous that the cooling water forms cyclic annular torrent in the nozzle, and the blowback nozzle clearance is little, and the cooling water can spill over in the quenching water tank, causes the rod to shake in the nozzle passageway, has the production fault rate height, and the reinforcing bar produces the crooked and performance poor scheduling problem that scatters greatly of wave. According to the comparison relationship between the thickness of the gasket and the gaps of the cooling nozzle, the drying nozzle and the back blowing nozzle provided by Daneli, the QTB waste heat treatment production efficiency and the performance stability of the reinforcing steel bar are tested on site through the adjustment of the thicknesses of different gaskets. Respectively testing the thicknesses of the cooling nozzle gasket, namely 5mm, 8mm and 9mm, and corresponding to the nozzle gaps, namely 1.29mm, 2.07mm and 2.33 mm; the thickness of the back-blowing nozzle and the drying nozzle is 5.5mm, 6.5mm and 7.5mm, and the corresponding nozzle gaps are 1.90mm, 2.20mm and 2.60 mm. Finally, the gap between the split cooling nozzles is determined to be 2.07mm, the gap between the back blowing nozzles is determined to be 2.60mm, cooling water forms a ring shape in the nozzles, water flow in the cooling nozzles provides forward thrust for the steel bars along the rolling direction, the forward cooling water can be sealed by reverse water flow in the back blowing nozzles, the cross section of the steel bars can be uniformly cooled, the sun and the shade surfaces cannot be generated, the steel bars stably run in the nozzles without shaking, the straightness of the steel bars is guaranteed, and therefore the thickness of the selected gasket is 8mm and 7.5 mm. After the design is optimized, cooling water forms uniform annular turbulence in the nozzle guide pipe, the bar is quickly surrounded by the water when passing through the cooler, the whole surface is uniformly cooled, and a yin-yang cooling surface cannot be formed; the water flow of the back flushing nozzle can completely seal the forward water to prevent water from overflowing from the quenching water tank, the steel bar cannot shake along with overflowing cooling water, and the straightness of the bar is guaranteed.
Thirdly, redesigning the arrangement mode of the cooling nozzles and the back-blowing nozzles according to the specification, replacing part of the cooling nozzles with a bypass roller way, and determining the water cooling length;
TABLE 3 arrangement of cooling nozzles and blowback nozzles
The arrangement mode of the original designed QTB water-cooling lines for the splitting rolling is shown in table 4, the process layout of the existing bar mill of the applicant is combined, the red steel in each water-cooling line is ensured to be uniformly cooled and stably run, and the arrangement mode of the QTB water-cooling lines for the splitting rolling is improved as shown in table 3.
TABLE 4 original design QTB water tank nozzle configuration table
Example one
The production specification is as follows: phi 10mm twisted steel
Steel grade designation: B500B
The production method comprises the following steps: four-segmentation rolling and QTB waste heat treatment process
Waste heat treatment process for QTB (quantitative trait locus) of four-segmentation screw steel with diameter of 10mm in Table 5
The online QTB cooling nozzle type waste heat treatment process is adopted, four lines after cutting and rolling respectively enter four water cooling channels in a QTB water tank, four deformed steels are uniformly cooled and stably run, and process accidents such as apron board steel flying, cooling bed steel disorder, fixed-length shear top steel and the like do not occur. The mechanical property of the twisted steel is controlled stably, the performance dispersion is small, the average value of yield strength is 582MPa, the average value of tensile strength is 662MPa, the average value of elongation is 22.2%, the average value of total elongation under maximum force is 9.0%, the average value of yield ratio is 1.16, and all performance indexes completely meet the requirements of British standard.
Example two
The production specification is as follows: phi 14mm twisted steel
Steel grade designation: B500B
The production method comprises the following steps: three-cutting rolling and QTB waste heat treatment process
Waste heat treatment process for three-segmentation screw-thread steel QTB with meter of 6 phi 14mm
The on-line QTB cooling nozzle type waste heat treatment process is adopted, three lines after cutting and rolling respectively enter three water cooling channels in a QTB water tank, three deformed steels are uniformly cooled and stably run, and process accidents such as apron board steel flying, cold bed steel disorder, fixed-length shear top steel and the like do not occur. The twisted steel has stable control of mechanical properties, small performance dispersion, an average value of yield strength 586MPa, an average value of tensile strength 675MPa, an average value of elongation 22.1%, an average value of total elongation at maximum force 9.2%, and an average value of yield ratio 1.15, and all performance indexes completely meet the requirements of British standard.
EXAMPLE III
The production specification is as follows: phi 18mm twisted steel
Steel grade designation: B500B
The production method comprises the following steps: two-cutting rolling and QTB waste heat treatment process
Waste heat treatment process for table 7 phi 18mm two-segment deformed steel bar QTB
By adopting an online QTB cooling nozzle type waste heat treatment process, two lines after cutting and rolling respectively enter two water cooling channels in a QTB water tank, two deformed steels are uniformly cooled and stably run, and process accidents such as apron board steel flying, cold bed steel disorder, fixed-length top steel shearing and the like do not occur. The twisted steel has stable control of mechanical properties, small performance dispersion, average yield strength 582MPa, average tensile strength 677MPa, average elongation 22.5%, average total elongation at maximum force 9.2% and average yield ratio 1.16, and all performance indexes completely meet the requirements of British standard.
In conclusion, the invention ensures that the cooling water forms annular jet by improving the clearance design of the cooling nozzle and the back-blowing nozzle in the QTB water tank for slitting and rolling; the distribution and arrangement form of the nozzles is improved, so that the arrangement length of the cooling nozzles is matched with the specification and the strength of the steel bars, stable operation of each red steel bar subjected to cutting and rolling in a channel formed by different cooling nozzle arrangements in the QTB water tank is ensured, and the occurrence of various process accidents such as finish rolling pile tail, QTB cooling shaking pile steel, multi-length shear steel clamping, apron board roller way conveying flying steel, cold bed alignment disorder steel, fixed-length shear head top steel and the like is reduced. And the metallographic structure of each deformed steel bar is ensured to be uniform, the performance is stable and the dispersion is small. After the QTB waste heat treatment process design is optimized, cooling water forms uniform annular turbulence in the nozzle guide pipe, the rod is quickly surrounded by the water when passing through the cooler, the whole surface is uniformly cooled, and a yin-yang cooling surface cannot be formed; the water flow of the back flushing nozzle can completely seal the forward water to prevent water from overflowing from the quenching water tank, the steel bar cannot shake along with overflowing cooling water, and the straightness of the bar is guaranteed. The zero control target of production accidents caused by the QTB heat treatment process is realized, and the performance qualification rate of the high-strength deformed steel bar reaches 100 percent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. An adjusting method of a QTB waste heat treatment process of cut rolled deformed steel bar; the method is characterized in that: first, the cooling nozzle conduit diameter is redesigned: the diameter of the deformed steel cooling nozzle guide pipe with the phi 10mm specification is optimally designed to be 24mm from the original 20 mm; the diameter of the thread steel cooling nozzle guide pipe with the diameter of more than 14mm is optimally designed to be 32mm from the original 24 mm;
secondly, the gaps of the cooling nozzle, the drying nozzle and the back blowing nozzle are reselected: the size of the gap between the cooling nozzle, the drying nozzle and the back blowing nozzle is adjusted by the thickness of the gasket; specifically, a relationship table of the thickness of the cooling nozzle gasket and the clearance and a relationship table of the back-blowing/drying nozzle gasket and the clearance are shown;
cooling nozzle shim thickness and gap relationship table
Back-blowing/drying nozzle gasket and gap relation table
The gap of a cooling nozzle is set to be 2.07mm during slitting rolling, the thickness of a gasket of the cooling nozzle is selected to be 8mm, the gap of a back-blowing/drying nozzle is set to be 2.6mm, and the thickness of a gasket of the back-blowing/drying nozzle is selected to be 7.5 mm;
thirdly, redesigning the arrangement mode of the cooling nozzles and the back-blowing nozzles according to specifications, replacing part of the cooling nozzles with a bypass roller way, and determining the length of a water-cooling line, particularly a cooling nozzle and back-blowing nozzle arrangement configuration table;
arrangement and configuration table for cooling nozzles and back-blowing nozzles
In the arrangement configuration table of the cooling nozzles and the back-blowing nozzles: b is bypass roller way, C is cooling nozzle, D is drying nozzle, S/C is back-blowing/cooling nozzle, 1 is on, and 0 is off.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113492150A (en) * | 2021-06-24 | 2021-10-12 | 盐城市联鑫钢铁有限公司 | Wire CRCC (continuous cooling control) production process and production line thereof |
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| Publication number | Publication date |
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| CN112474831B (en) | 2022-10-25 |
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