CN109909298B - Production line of excellent steel and deformed steel bar and production method of excellent steel and deformed steel bar - Google Patents
Production line of excellent steel and deformed steel bar and production method of excellent steel and deformed steel bar Download PDFInfo
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- CN109909298B CN109909298B CN201910217468.9A CN201910217468A CN109909298B CN 109909298 B CN109909298 B CN 109909298B CN 201910217468 A CN201910217468 A CN 201910217468A CN 109909298 B CN109909298 B CN 109909298B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 154
- 239000010959 steel Substances 0.000 title claims abstract description 154
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 61
- 238000005096 rolling process Methods 0.000 claims abstract description 111
- 238000001816 cooling Methods 0.000 claims abstract description 46
- 238000004513 sizing Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 81
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention provides a production line of excellent steel and deformed steel bars and a production method of excellent steel and deformed steel bars, which are used for solving the problem of high production cost in the prior art. The invention provides a production line of excellent steel and deformed steel bar, which comprises the following steps in sequence along the rolling direction: the device comprises a heating furnace, a rough rolling unit, first flying shear equipment, a middle rolling unit, second flying shear equipment, a finishing mill unit, a finish rolling water cooling section, third flying shear equipment, at least two-roller reducing units, at least two three-roller reducing sizing units, a reducing sizing water cooling section, fourth flying shear equipment and a cooling bed; the roll gap between the rolls of each two-roll reducing unit is adjustable; the roll gap between the roll collars of each three-roll reducing sizing mill is adjustable. The cost is effectively saved.
Description
Technical Field
The invention relates to the technical field of hot rolled bars in the ferrous metallurgy industry, in particular to a production line of excellent steel and deformed steel bars and a production method of the excellent steel and the deformed steel bars.
Background
The bar is one of important products in the steel industry and is widely used in the industries of building, machinery and metal products. In addition, the excellent steel bar product is also widely applied to the industrial fields of metallurgy, machinery, automobiles, mines, bridge construction, railway construction and the like. In recent years, the yield is continuously increased, the yield of excellent steel bars in 2017 is 6806.7 ten thousand tons, the yield of screw-thread steel is 19997.7 ten thousand tons, and the total amount of steel in China is 32.2%. With the deep advancement of supply side reform, the method has the advantages that the product structure is adjusted, the product quality is improved, and the production cost is reduced for a long period in the future, so that the method is a direction of survival and development of bars.
The main rolling line rolling unit of rod mainly includes: a rough rolling unit, a middle rolling unit and a finishing rolling unit. The number of frames of the bar roughing mill group, the intermediate mill group and the finishing mill group at present is 6 frames+6 frames respectively. In order to obtain good product surface quality, the whole rolling line adopts torsion-free rolling (the finishing mill group for slitting rolling is torsion rolling), and rolling guide is configured at the inlet of the oval section rolled piece entering the next rolling mill. With the improvement of the performance requirements of customers on steel products, in order to obtain better mechanical properties, a controlled rolling and controlled cooling technology is required to produce rod and wire products, so that a water cooling section and a reducing sizing mill are generally arranged behind a finishing mill group to control the reducing sizing deformation temperature and the deformation, however, due to the influence of the configuration of a production line, when the rolling line is provided with two reducing sizing rollers, the precision is not high during the production of excellent steel, and when three reducing sizing rollers are adopted, the threaded steel cannot be produced due to the influence of the deformation characteristics of the three reducing rollers.
With the implementation of a new standard of the deformed steel bar, higher requirements are set for dimensional tolerance, microstructure composition and mechanical property of the deformed steel bar, and the conventional bar production line configuration cannot completely meet the requirements of producing the deformed steel bar with higher grade at low cost and high efficiency; for the excellent steel bar, along with the improvement of the requirements of users on the quality of products and the improvement of the requirements of downstream users on the heat treatment cost and the dimensional accuracy of the products, the conventional bar production line can not completely meet the production requirements.
In order to meet the production requirements of deformed steel bars and excellent steel bars, the problem is more remarkable when the profit of the existing steel products is thinner, and other process links of the whole workshop are required to be considered and optimized under the condition that the rolling production process cannot be reduced, so that the energy consumption and the cost of the workshop are reduced, and the production efficiency and the production profit of the workshop are improved.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a production line of excellent steel and deformed steel bar and a production method of excellent steel and deformed steel bar for solving the problem of high production cost in the prior art.
To achieve the above and other related objects, the present invention provides a production line for excellent steel and deformed steel bars, which sequentially comprises:
the device comprises a heating furnace, a rough rolling unit, first flying shear equipment, a middle rolling unit, second flying shear equipment, a finishing mill unit, a finish rolling water cooling section, third flying shear equipment, at least two-roller reducing units, at least two three-roller reducing sizing units, a reducing sizing water cooling section, fourth flying shear equipment and a cooling bed;
the roll gap between the rolls of each two-roll reducing unit is adjustable;
the roll gap between the roll collars of each three-roll reducing sizing mill is adjustable.
Optionally, a water cooling section before finish rolling is arranged between the middle rolling unit and the finish rolling unit, an air cooling section is further arranged behind the water cooling section after finish rolling, and an air cooling section is further arranged behind the water cooling section before finish rolling.
Optionally, the two-roll reducing mill set and the three-roll reducing mill set are respectively provided with at least two sets of transmission speed ratios.
Optionally, the reduction gearbox of the two-roll reducing mill and the three-roll reducing mill comprises:
the input shaft is provided with a first input gear and a second input gear, and the axial positions of the first input gear and the second input gear on the input shaft are adjustable;
an intermediate shaft parallel to the input shaft, wherein a first intermediate gear and a second intermediate gear are arranged on the intermediate shaft;
the output shaft is parallel to the intermediate shaft, a first output gear and a second output gear are arranged on the output shaft, and the axial positions of the first output gear and the second output gear on the output shaft are adjustable.
Optionally, the three-roll reducing mill includes:
the three-roller box is internally provided with three roller rings, the three roller rings are annularly arranged at 120-degree intervals, and the diameters of the circular arrangement of the three roller rings are adjustable;
the transmission mechanism is provided with an input end, and three output ends matched with the three roll collars are arranged on the transmission mechanism.
Optionally, the transmission mechanism comprises a first transmission group, a second transmission group and a third transmission group, and the first transmission group, the second transmission group and the third transmission group are combined to form a U-shaped structure;
the first transmission group comprises a first straight gear and a second straight gear, the first straight gear is fixedly sleeved on the input shaft of one roll collar, and the input shafts of the other two roll collars are respectively provided with a first input bevel gear and a second input bevel gear;
the second transmission group comprises a first transmission shaft, a first transmission bevel gear fixed on the first transmission shaft and a second transmission bevel gear fixed on the first transmission shaft;
the second straight gear is fixedly sleeved on the first transmission shaft, and the first transmission bevel gear is meshed with the first input bevel gear;
the third transmission group comprises a second transmission shaft, a third transmission bevel gear fixed on the second transmission shaft and a fourth transmission bevel gear fixed on the second transmission shaft;
the third transmission bevel gear is meshed with the second transmission bevel gear, and the fourth transmission bevel gear is meshed with the second input bevel gear.
Optionally, the first transmission group further includes an intermediate spur gear, the intermediate spur gear is meshed with the first spur gear and the second spur gear respectively, and the intermediate spur gear is matched with an output shaft of the motor.
The production method of the excellent steel and the deformed steel bar utilizes the excellent steel and deformed steel bar production line, when the excellent steel is produced, the two-roller reducing mill sets reduce the diameter of the excellent steel bar, and the three-roller reducing mill sets reduce and size the excellent steel bar; or the size of the two rolls in each two-roll reducing mill is enlarged, and only the three-roll reducing mill reduces and sizes the excellent steel bar;
when the deformed steel bar is produced, the size enclosed between the roll collars in each three-roll reducing sizing mill is enlarged, and only the two-roll reducing mill reduces the deformed steel bar.
Optionally, when the excellent steel is produced, the rolling temperature of the rolled piece is 730-1200 ℃;
when producing screw-thread steel, the rolling temperature of the rolled piece is 730-1000 ℃.
Optionally, when producing excellent steel, the billet heating temperature is 1000-1300 ℃; the rough rolling and middle rolling temperatures of the billet are controlled at 900-1200 ℃, the finish rolling inlet temperature is controlled at 800-1000 ℃, the elongation coefficient of each pass of rough rolling, middle rolling and finish rolling is 1.10-1.40, the temperature of a two-roller reducing unit is ensured at 730-950 ℃, the elongation coefficient of a single pass of the two-roller reducing unit is 1.18-1.35, the elongation coefficient of a single pass of a three-roller reducing unit is 1.01-1.15, the upper cooling bed temperature is 600-850 ℃, and the lower cooling bed temperature is 300-500 ℃;
when producing the screw steel, the billet heating temperature is 950 ℃ to 1000 ℃; the rough rolling and intermediate rolling temperatures of the billet are controlled at 900-1000 ℃, the finish rolling inlet temperature is controlled at 800-900 ℃, the elongation coefficient of each pass of rough rolling, intermediate rolling and finish rolling is 1.10-1.40, the temperature of the two-roller reducing unit is ensured at 730-820 ℃, the elongation coefficient of each pass of the two-roller reducing unit is 1.18-1.35, the upper cooling bed temperature is 650-800 ℃, and the lower cooling bed temperature is 300-500 ℃.
As described above, the production line of excellent steel and deformed steel bar and the production method of excellent steel and deformed steel bar have at least the following beneficial effects:
the temperature of the rolled piece entering the finishing mill group and the inlet temperature of the reducing sizing mill group are precisely controlled through water cooling before and after finish rolling, and the strength of the deformed steel bars and the excellent steel bars is improved through phase change reinforcement by a low-temperature large-pressure deformation system, so that the addition of alloy is reduced, the production cost of enterprises is further reduced, and the economic benefit of the enterprises is improved. When the deformed steel bar is rolled, rolling is realized under low temperature and high pressure by the two-roller reducing mill, when the excellent steel is rolled, rolling is realized under low temperature and high pressure by the two-roller reducing mill, high-precision rolling is realized by the three-roller sizing mill, the process arrangement and the production method of the production line can both consider deformed steel bars and excellent steel bars, factory investment can be reduced, the factory can produce deformed steel bars or excellent steel bars according to market demands, production flexibility is improved, and meanwhile, the comprehensive mechanical properties of the deformed steel bars and excellent steel bars can be improved through phase change strengthening by adopting low temperature and high pressure rolling. The produced deformed steel bar and excellent steel bar have excellent performance, stable structure and good development prospect, and accord with sustainable development strategy.
Drawings
FIG. 1 is a schematic view of a production line for excellent steel and deformed steel bars according to the present invention.
Fig. 2 shows a schematic diagram of the change of the end face of the deformed steel bar according to the present invention.
FIG. 3 shows a schematic diagram of the change of the end face of the excellent steel of the present invention.
Fig. 4 shows a schematic diagram of the structure of the speed reducer for a two-roll reducing mill and a three-roll reducing mill.
Fig. 5 shows a schematic view of a three-roll reducing mill.
Fig. 6 is a temperature difference cloud chart of a reducing sizing core surface of a deformed bar HRB 400E.
Fig. 7 shows a metallographic structure of the deformed bar HRB 400E.
1. Heating furnace
2. Roughing mill set
3. Middle rolling mill group
4. Finishing mill group
5. Post finish rolling water cooling section
6. Two-roller reducing mill set
7. Three-roller reducing sizing mill
8. Water cooling section after reducing sizing
91. First flying shear device
92. Second flying shear device
93. Third flying shear device
94. Fourth flying shear device
10. Cooling bed
31. Finish rolling front water cooling section
a reduction gearbox
a1 Input shaft
a2 Intermediate shaft
a3 Output shaft
a11 First input gear
a12 Second input gear
a21 First intermediate gear
a22 Second intermediate gear
a31 First output gear
a32 Second output gear
71. Three-roller box
72. Transmission mechanism
711. Roll collar
721. Input terminal
722. First transmission group
723. Second transmission group
724. Third transmission group
7221. First straight gear
7222. Second spur gear
7111. First input bevel gear
7112. Second input bevel gear
7231. First transmission shaft
7232. First drive bevel gear
7233. Second drive bevel gear
7241. Second transmission shaft
7242. Third drive bevel gear
7243. Fourth drive bevel gear
7220. Intermediate spur gear
725 U-shaped bracket
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1 to 5. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are otherwise, required to achieve the objective and effect taught by the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
The following examples are given by way of illustration only. Various embodiments may be combined and are not limited to only what is presented in the following single embodiment.
Referring to fig. 1, the invention provides a production line of excellent steel and deformed steel bars, which comprises the following steps in sequence along the rolling direction:
the device comprises a heating furnace 1, a roughing mill group 2, a first flying shear device 91, a middle rolling mill group 3, a second flying shear device 92, a finishing mill group 4, a finish rolling post-water cooling section 5, a third flying shear device 93, two or more two-roll reducing mill groups 6, two or more three-roll reducing sizing mill groups 7, a reducing sizing post-water cooling section 8, a fourth flying shear device 94 and a cooling bed 10; the rolling diameter between the rollers of each two-roller reducing unit 6 is adjustable, namely the roller gap of the rollers is adjustable, and steel with different sizes can be rolled by different roller gaps; the rolling diameter between the roll collars of each three-roll reducing sizing mill 7 is adjustable, namely the roll gaps of the roll collars are adjustable, and steel materials with different sizes can be rolled by different roll gaps. During specific adjustment, the relative distance between each roll collar or each roll is adjusted to be far or near, and the specific adjustment structure can be realized through the eccentric sleeve or the three-jaw chuck.
Through the mixed configuration of two roller reducing mill 6 and three roller reducing mill 7 for this production line can adapt to the production of screw steel and excellent steel simultaneously, the effectual equipment cost of having practiced thrift makes the position of the roll of two roller reducing mill 6 adjust to the size that the system needs when needs use two roller reducing mill 6, when not needing, with the distance between the roll outside adjust can, three roller reducing mill 7 is the same, and the unnecessary description is omitted here.
In this embodiment, referring to fig. 1, a water cooling section 31 before finish rolling is disposed between the intermediate rolling train 3 and the finish rolling train 4.
The water cooling section 31 is cooled before finish rolling to realize low-temperature rolling, so that the quality of products is ensured.
In this embodiment, all be equipped with the air-cooled section behind every water-cooled section, specificly in the rolling mill group with be equipped with the finish rolling front water-cooled section between the finishing mill group, still be equipped with the air-cooled section behind the finish rolling rear water-cooled section, still be equipped with the air-cooled section behind the finish rolling front water-cooled section.
Avoid the too big temperature difference, the structure homogeneity of the inside and outside of steel of assurance avoids appearing the layering phenomenon.
In this embodiment, referring to fig. 1, all the technical features in the above embodiments are included, so that the switching between the production of the deformed steel bar and the production of the excellent steel bar is realized, the cost is saved, and the production quality of the deformed steel bar and the production quality of the excellent steel bar can be respectively ensured.
In this embodiment, referring to fig. 2, the two-roll reducing mill 6 and the three-roll reducing mill 7 are each provided with two or more sets of transmission speed ratios. When different steel products are selected for production, different roll collars or roll rotating speeds are selected, or one steel product adopts different roll collars or roll rotating speeds, so that the process requirements can be met more.
In this embodiment, referring to fig. 2, the reduction gearbox a of the two-roll reducing mill 6 and the three-roll reducing mill 7 includes: an input shaft a1, an intermediate shaft a2 parallel to the input shaft a1 and an output shaft a3 parallel to the intermediate shaft a2, wherein a first input gear a11 and a second input gear a12 are arranged on the input shaft a1, and the axial positions of the first input gear a11 and the second input gear a12 on the input shaft a1 are adjustable; the intermediate shaft a2 is provided with a first intermediate gear a21 and a second intermediate gear a22; the output shaft a3 is provided with a first output gear a31 and a second output gear a32, and the axial positions of the first output gear a31 and the second output gear a32 on the output shaft a3 are adjustable. Four speed regulation are realized, and when specific regulation is realized, specific transmission paths are: 1. a first input gear a 11-a first intermediate gear a 21-a first output gear a31;2. a first input gear a 11-a first intermediate gear a 21-a second output gear a32;3. a second input gear a 12-a first intermediate gear a 21-a first output gear a31;4. a second input gear a 12-a first intermediate gear a 21-a second output gear a32.
In this embodiment, the three rolls of the three-roll reducing mill 7 are driven by three motors, respectively.
In this embodiment, referring to fig. 3, three rolls of the three-roll reducing mill 7 are driven by one motor, respectively. The three-roll reducing mill 7 comprises: three roller boxes 71 and a transmission mechanism 72, wherein three roller rings 711 are arranged in the three roller boxes 71 at 120-degree intervals; the transmission 72 has an input 721 and the transmission 72 has three outputs that mate with three of the collars 711. Optionally, the diameter of the circular arrangement of the three collars 711 may be adjustable;
in this embodiment, referring to fig. 3, the transmission mechanism 72 includes a first transmission set 722, a second transmission set 723 and a third transmission set 724, where the first transmission set 722, the second transmission set 723 and the third transmission set 724 combine to form a U-shaped structure;
the first driving set 722 includes a first straight gear 7221 and a second straight gear 7222, the first straight gear 7221 is fixedly sleeved on the input shaft of one of the roller collars 711, and the input shafts of the other two roller collars 711 are respectively provided with a first input bevel gear 7111 and a second input bevel gear 7112; the second drive group 723 includes a first drive shaft 7231, a first drive bevel gear 7232 fixed to the first drive shaft 7231, and a second drive bevel gear 7233 fixed to the first drive shaft 7231; the second straight gear 7222 is fixedly sleeved on the first transmission shaft 7231, and the first transmission bevel gear 7232 is meshed with the first input bevel gear 7111; the third drive group 724 includes a second drive shaft 7241, a third drive bevel gear 7242 fixed to the second drive shaft 7241, and a fourth drive bevel gear 7243 fixed to the second drive shaft 7241; the third drive bevel gear 7242 is engaged with the second drive bevel gear 7233, and the fourth drive bevel gear 7243 is engaged with the second input bevel gear 7112.
In this embodiment, referring to fig. 3, the first transmission set 722, the second transmission set 723 or the third transmission set 724 are matched with the output shaft of the motor. The output shaft of the motor is the input 721. It may also enable input of a positive drive mechanism by driving either the first drive shaft 7231 or the second drive shaft 7241.
In this embodiment, referring to fig. 3, the first driving set 722 further includes an intermediate spur gear 7220, where the intermediate spur gear 7220 is meshed with the first spur gear 7221 and the second spur gear 7222, and the intermediate spur gear 7220 is matched with an output shaft of the motor. The reduction gearbox a is arranged on the output shaft of the motor.
In this embodiment, referring to fig. 3, the first drive-train 722, the second drive-train 723 and the third drive-train 724 are mounted on a U-bracket 725. The U-shaped bracket 725 may be disposed in an upward direction as shown in fig. 3, or may be disposed in a horizontal direction. The structure is simplified by driving a motor, and the rolling consistency of the three roller rings 711 is ensured.
In this embodiment, a production method of a steel bar and a threaded steel bar, using the steel bar and threaded steel bar production line of any one of the embodiments and the combination embodiment, when producing a steel bar, two or more than two reducing roller sets are used to reduce the diameter of the steel bar, and the three reducing roller sets are used to size the steel bar. At this time, both the two-roll reducing mill and the three-roll reducing mill are used.
In this embodiment, in the production method of the excellent steel and the threaded steel rod, when the excellent steel is produced by using the excellent steel and threaded steel rod production line, the distance between the rollers in each two-roller reducing mill set is increased, so that the excellent steel rod is not rolled, and only the three-roller reducing mill set performs reducing sizing on the excellent steel rod. Only a three-roll reducing mill is used at this time.
In the embodiment, the rolling temperature of the rolled piece is 730-1200 ℃ when the excellent steel is produced.
In the embodiment, the production method of the excellent steel and the threaded steel rod comprises the following steps that when the excellent steel is produced, the billet heating temperature is 1000-1300 ℃; the rough rolling and middle rolling temperatures of the billet are controlled at 900-1200 ℃, the finish rolling inlet temperature is controlled at 800-1000 ℃, the elongation coefficient of each pass of rough rolling, middle rolling and finish rolling is 1.10-1.40, the temperature of a two-roller reducing unit is ensured at 730-950 ℃, the elongation coefficient of a single pass of the two-roller reducing unit is 1.18-1.35, the elongation coefficient of a single pass of a three-roller reducing unit is 1.01-1.15, the upper cooling bed temperature is 600-850 ℃, and the lower cooling bed temperature is 300-500 ℃.
In this embodiment, in the production method of the excellent steel and the deformed steel bar, when deformed steel bar is produced by using the excellent steel and deformed steel bar production line, two or more than two reducing roller sets are used for reducing the deformed steel bar, and the distance between the rollers in each three reducing roller set is increased so that the three reducing roller sets do not play a role in rolling the deformed steel bar.
In the embodiment, the rolling temperature of the rolled piece is 730-1000 ℃ when the deformed steel bar is produced.
In the embodiment, the production method of the excellent steel and the threaded steel rod comprises the step that when the threaded steel is produced, the billet heating temperature is 950-1100 ℃; the rough rolling and intermediate rolling temperatures of the billet are controlled at 900-1000 ℃, the finish rolling inlet temperature is controlled at 800-900 ℃, the elongation coefficient of each pass of rough rolling, intermediate rolling and finish rolling is 1.10-1.40, the temperature of the two-roller reducing unit is ensured at 730-820 ℃, the elongation coefficient of each pass of the two-roller reducing unit is 1.18-1.35, the upper cooling bed temperature is 600-800 ℃, and the lower cooling bed temperature is 300-500 ℃.
TABLE 1 example screw-threaded steel HRB400E chemical composition (wt%)
Comparative example 1, comparative example 2 and inventive examples except for the above-mentioned ratio of components, the balance was iron.
Table 2 example related process parameters during HRB400E rolling of deformed bar
Table 3 mechanical properties and grain size of the example deformed bar HRB400E
Referring to fig. 6 and 7, and referring to tables 1 to 3, by precisely controlling the rolling temperature, including the finishing mill rolling temperature and the reducing sizing mill rolling temperature, and combining the water cooling and the recovery section to precisely control the core surface temperature difference, two-phase region rolling is realized, austenite grains are refined, cooling efficiency is improved by water cooling after rolling, pearlite transformation and bainite transformation are realized, no martensite structure exists in a metallographic structure, the grain grade is stabilized at 11-12 levels, the yield strength can be stabilized at 450MPa + -20 MPa, the tensile strength is greater than or equal to 580MPa, the yield ratio is less than 0.8, the elongation is greater than 20%, the core surface hardness difference is less than or equal to 30HV, the cold bending property and the reverse cold bending property completely meet the GB1499.2-2018 standard, and the alloy has good plasticity, toughness, shock resistance property and welding property.
In conclusion, the phase change reinforcement is realized through the low-temperature high-pressure deformation system to improve the strength of the deformed steel bars and the excellent steel bars, so that the addition of alloy is reduced, the production cost of enterprises is further reduced, and the economic benefit of the enterprises is improved. When the deformed steel bar is rolled, rolling is realized under low temperature and high pressure by the two-roller reducing mill, when the excellent steel is rolled, rolling is realized under low temperature and high pressure by the two-roller reducing mill, high-precision rolling is realized by the three-roller sizing mill, the process arrangement and the production method of the production line can both consider deformed steel bars and excellent steel bars, factory investment can be reduced, the factory can produce deformed steel bars or excellent steel bars according to market demands, production flexibility is improved, and meanwhile, the comprehensive mechanical properties of the deformed steel bars and excellent steel bars can be improved through phase change strengthening by adopting low temperature and high pressure rolling. The produced deformed steel bar and excellent steel bar have excellent performance, stable structure and good development prospect, and accord with sustainable development strategy. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (7)
1. Excellent steel and screw steel rod production line, its characterized in that has set gradually along the rolling direction:
the device comprises a heating furnace, a rough rolling unit, first flying shear equipment, a middle rolling unit, second flying shear equipment, a finishing mill unit, a finish rolling water cooling section, third flying shear equipment, at least two-roller reducing units, at least two three-roller reducing sizing units, a reducing sizing water cooling section, fourth flying shear equipment and a cooling bed;
the roll gap between the rolls of each two-roll reducing unit is adjustable;
the roll gap between the roll collars of each three-roll reducing sizing mill is adjustable;
the two-roller reducing mill set and the three-roller reducing sizing mill set are respectively provided with at least two groups of transmission speed ratios;
the reduction gearbox of the two-roll reducing mill and the three-roll reducing mill comprises:
the input shaft is provided with a first input gear and a second input gear, and the axial positions of the first input gear and the second input gear on the input shaft are adjustable;
an intermediate shaft parallel to the input shaft, wherein a first intermediate gear and a second intermediate gear are arranged on the intermediate shaft;
the output shaft is parallel to the intermediate shaft, a first output gear and a second output gear are arranged on the output shaft, and the axial positions of the first output gear and the second output gear on the output shaft are adjustable;
the three-roll reducing mill includes:
the three-roller box is internally provided with three roller rings, the three roller rings are annularly arranged at 120-degree intervals, and the diameters of the circular arrangement of the three roller rings are adjustable;
the transmission mechanism is provided with an input end, and three output ends matched with the three roll collars are arranged on the transmission mechanism.
2. The excellent steel and deformed steel bar production line according to claim 1, wherein: the water cooling section before finish rolling is arranged between the middle rolling unit and the finish rolling unit, the air cooling section is further arranged behind the water cooling section after finish rolling, and the air cooling section is further arranged behind the water cooling section before finish rolling.
3. The excellent steel and deformed steel bar production line according to claim 2, wherein: the transmission mechanism comprises a first transmission group, a second transmission group and a third transmission group, and the first transmission group, the second transmission group and the third transmission group are combined to form a U-shaped structure;
the first transmission group comprises a first straight gear and a second straight gear, the first straight gear is fixedly sleeved on the input shaft of one roll collar, and the input shafts of the other two roll collars are respectively provided with a first input bevel gear and a second input bevel gear;
the second transmission group comprises a first transmission shaft, a first transmission bevel gear fixed on the first transmission shaft and a second transmission bevel gear fixed on the first transmission shaft;
the second straight gear is fixedly sleeved on the first transmission shaft, and the first transmission bevel gear is meshed with the first input bevel gear;
the third transmission group comprises a second transmission shaft, a third transmission bevel gear fixed on the second transmission shaft and a fourth transmission bevel gear fixed on the second transmission shaft;
the third transmission bevel gear is meshed with the second transmission bevel gear, and the fourth transmission bevel gear is meshed with the second input bevel gear.
4. A production line for excellent steel and deformed steel bars according to claim 3, wherein: the first transmission group further comprises an intermediate spur gear, the intermediate spur gear is meshed with the first spur gear and the second spur gear respectively, and the intermediate spur gear is matched with an output shaft of the motor.
5. A production method of excellent steel and deformed steel bar by using the excellent steel and deformed steel bar production line of any one of claims 1-4, which is characterized in that: when the excellent steel is produced, the two-roller reducing mill set reduces the diameter of the excellent steel rod, and the three-roller reducing sizing mill set reduces and sizes the excellent steel rod; or the size of the two rolls in each two-roll reducing mill is enlarged, and only the three-roll reducing mill reduces and sizes the excellent steel bar;
when the deformed steel bar is produced, the size enclosed between the roll collars in each three-roll reducing sizing mill is enlarged, and only the two-roll reducing mill reduces the deformed steel bar.
6. The production method of the excellent steel and the deformed steel bar according to claim 5, wherein: when the excellent steel is produced, the rolling temperature of the rolled piece is 730-1200 ℃;
when producing screw-thread steel, the rolling temperature of the rolled piece is 730-1000 ℃.
7. The production method of the excellent steel and the deformed steel bar according to claim 6, wherein: when the excellent steel is produced, the billet heating temperature is 1000-1300 ℃; the rough rolling and middle rolling temperatures of the billet are controlled at 900-1200 ℃, the finish rolling inlet temperature is controlled at 800-1000 ℃, the elongation coefficient of each pass of rough rolling, middle rolling and finish rolling is 1.10-1.40, the temperature of a two-roller reducing unit is ensured at 730-950 ℃, the elongation coefficient of a single pass of the two-roller reducing unit is 1.18-1.35, the elongation coefficient of a single pass of a three-roller reducing unit is 1.01-1.15, the upper cooling bed temperature is 600-850 ℃, and the lower cooling bed temperature is 300-500 ℃;
when producing the screw steel, the billet heating temperature is 950 ℃ to 1000 ℃; the rough rolling and intermediate rolling temperatures of the billet are controlled at 900-1000 ℃, the finish rolling inlet temperature is controlled at 800-920 ℃, the elongation coefficient of each pass of rough rolling, intermediate rolling and finish rolling is 1.10-1.40, the temperature of the two-roller reducing unit is ensured at 730-820 ℃, the elongation coefficient of each pass of the two-roller reducing unit is 1.18-1.35, the upper cooling bed temperature is 600-800 ℃, and the lower cooling bed temperature is 300-500 ℃.
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| CN110538867A (en) * | 2019-06-28 | 2019-12-06 | 中冶华天工程技术有限公司 | Method for improving precision and yield of common bar deformed steel bar by cutting |
| CN111424149A (en) * | 2020-05-11 | 2020-07-17 | 江苏联峰实业有限公司 | Gear steel strip-shaped structure control process |
| CN112845579A (en) * | 2021-01-07 | 2021-05-28 | 赵洋梵 | Finish rolling process for manufacturing deformed steel bar |
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