CN116037645A - Control cooling method for hot-rolled straight long bar after rolling - Google Patents
Control cooling method for hot-rolled straight long bar after rolling Download PDFInfo
- Publication number
- CN116037645A CN116037645A CN202211474059.5A CN202211474059A CN116037645A CN 116037645 A CN116037645 A CN 116037645A CN 202211474059 A CN202211474059 A CN 202211474059A CN 116037645 A CN116037645 A CN 116037645A
- Authority
- CN
- China
- Prior art keywords
- cooling
- hot
- air
- steel
- wind
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Metal Rolling (AREA)
Abstract
The utility model relates to a control cooling method for a thermal state straight long material, and belongs to the field of metal material processing. The hot straight long materials enter the cooling bed through the conveying roller way, fans are arranged in sections along the length direction of the cooling bed, high-speed air at the outlet of the fans performs forced cooling on the conveying roller way and the straight long materials on a certain width area of the cooling bed from top to bottom, the straight long materials move forward and rotate when conveyed on the cooling bed, the full-length temperature uniformity of the hot straight long materials is controlled by adjusting the output wind speed or the wind quantity of each fan, and the cooling speed and the air cooling end temperature of the straight long materials are controlled by adjusting the wind speed or the wind quantity of the fans and the conveying frequency of the cooling bed. The utility model is beneficial to the uniform and rapid cooling of the hot straight long material, obtains uniform and fine ideal structure, improves the mechanical property of the long material, reduces the level of the strip-shaped structure of the steel, and reduces the thickness of the decarburized layer of the medium-high carbon steel.
Description
Technical Field
The utility model belongs to the material processing engineering technology, and relates to a post-rolling control cooling method for hot-rolled straight long materials, in particular to a method for air cooling during conveying of the straight long materials on a post-rolling cooling bed.
Background
At present, the cooling mode after bar rolling is mainly through water cooling, namely finished rolled pieces immediately pass through a water cooling device to be forcedly cooled after being rolled out of a finishing mill, and the structural state of deformed austenite is controlled through intensive cooling, and the bar is usually in a sleeve type form and a turbulent flow tubular form. The cooling mode of using through water cooling as the cooling mode after rolling mainly has the following four defects:
1) In the water cooling process, the cooling water reacts very severely when contacting with the rolled piece, so that the surface cooling rate of the rolled piece is overlarge, a large temperature gradient is formed in the radial direction of the bar, and the surface and the core part are unevenly cooled.
2) The surface cooling speed of the bar is too high in the process of passing water through the bar after rolling, tempered martensite and iron scales are easy to appear after cooling, and the structure performance is unstable, so that the practical use of the bar is affected.
3) The hot rolled bar mostly requires a metallographic structure in a near-equilibrium state, mainly ferrite and pearlite, and has no harmful surface defects. For example, hot rolled steel bars are required to have excellent cold bending workability and an obvious yield point as construction steel, but bainite and other structures are generated in the water cooling process, so that the toughness of bars is reduced and the yield point is lost.
4) The water pressure requirement is higher during water cooling, enough power needs to be provided for enhancing the water pressure, and the production cost is increased.
At present, a forced air cooling process represented by a stelmor process has been used in the production of wire materials. In the production of the bar, the problems of uneven cooling and difficult control of the cooling process can be effectively solved through a forced air cooling process.
A sectional ladder type cooling device for hot rolling high-strength steel bars designed by Chinese patent CN206351176U comprises two cooling areas, namely a sectional ladder type cooling area and a quick cooling area, wherein the steel bars sequentially pass through the sectional ladder type cooling area and the quick cooling area and simultaneously carry out adjustment and control of various process parameters by a matched integrated system. The method has the advantages of improving the morphology, structure and integrity of the surface oxide scale, and achieving the aims of delaying rust and improving the microstructure in the sales period. Although the aim of controlling cooling is achieved, because water cooling is still used, abnormal tissues are easily generated on the surface of the product, and the final product performance is affected.
Chinese patent CN211538997U devised a cooling device for hot-rolled screw bar shearing area, which is characterized in that cooling water and compressed air are respectively fed into an upper water inlet pipe, a lower water inlet pipe, an upper air inlet pipe, a lower air inlet pipe, and an upper air inlet pipe, and a lower air inlet pipe through a water inlet and a compressed air inlet, the cooling water and the compressed air are mixed in an upper atomizing nozzle and a lower atomizing nozzle to form atomized water, and are respectively sprayed out from the upper atomizing nozzle and the lower atomizing nozzle to cool the screw bar to be sheared passing between the upper nozzle frame beam and the lower nozzle frame beam. The air-water mixing effect is good, the adjusting range is large, the cooling strength is larger than that of the pure water nozzle, and the cooling mechanism is better than that of pure water cooling through air-water separate control. However, this method cannot effectively control the cooling rate and final cooling temperature of the twisted steel, and has a certain limitation.
The utility model patent application CN103191936A proposes an on-line cooling control device for rolled steel bars, which comprises an inlet, an inlet fixing seat, a steel penetrating cold air pipe, an outlet fixing seat and an air inlet pipe, wherein the arrangement position of the on-line cooling control device is arranged on a rolling line conveying roller way, a cooling medium is compressed air, and the steel is forced to be cooled on the conveying roller way through a special design air spray head. And Chinese patent No. 211707731U designs a slow cooling device for rolling rod and wire rods, which uses an air cooling method. The steel bar rolling device comprises a cross beam and steel bars, wherein the upper end of the cross beam is provided with air cooling nozzles and guide pipes, the rolled steel bars sequentially penetrate through the left ends of the air cooling nozzles, the steel bars are cooled by air under the action of the air cooling nozzles, heat dissipation is accelerated, the water consumption is low, the energy is saved, the environment is protected, the cooling effect is enhanced, the cooling quality is well guaranteed, and good economic and social benefits are achieved. But these two kinds of devices can not cool a plurality of reinforcing bars simultaneously, are not suitable for the mass production of reinforcing bars, influence production efficiency.
The utility model patent application CN211060461U designs a reinforcing steel bar air cooling operation device which comprises a bottom plate, wherein a curved copper pipe is sleeved in the bottom plate, a faster heat dissipation effect can be provided in the use process through the superposition of the U-shaped copper pipe and the curved copper pipe and a multi-layer fan structure, the fan is arranged on the inner side, a certain rotating speed can be reduced under the condition of faster heat dissipation speed through the design of the three-layer fan, the noise generation of the fan is further reduced, the work that a person cannot hear the fan in the working state can be realized in the actual use process, and the device has a certain beneficial effect. This patent application is not concerned with the cooling method and cooling effect of the steel reinforcement.
The utility model designs a control cooling method for a hot rolled straight long bar after rolling, wherein the straight long bar reaches a conveying roller way after passing through a rolling mill, and forced air cooling is carried out on the conveying roller way and the straight long bar on a certain area of a cooling bed from top to bottom by adopting a fan air port. The straight long bar moves forward and rotates in the conveying process on the cooling bed, and the cooling speed and the final cooling temperature of the bar are regulated and controlled through forced air cooling, so that uniform and proper tissues are obtained, the comprehensive performance of the bar is improved, the production cost is reduced, and uniform and rapid cooling of the hot rolled straight long bar is realized.
Disclosure of Invention
The utility model provides a control cooling method of a thermal state straight strip long material, which aims to enable the thermal state straight strip long material to be cooled rapidly and uniformly, refine grains, obtain a product with uniform structure and excellent performance, reduce production cost and improve economic benefit.
A control cooling method for a thermal state straight long material is characterized in that: the fans are arranged in sections along the length direction of the cooling bed, and the cooling speed and final cooling temperature of the straight long material on the cooling bed and the full-length temperature uniformity of the hot-rolled straight long material are controlled by adjusting the air speed and the air quantity of the fans and the average speed of cooling bed conveying in the forced air cooling process according to the temperature and room temperature organization performance requirements of the straight long material.
Further, the specific steps of the cooling control method are as follows:
(1) The hot straight long materials are input into the cooling bed through the conveying roller way, and the straight long materials advance and rotate in the conveying process on the cooling bed;
(2) Arranging fans in sections along the length direction of the cooling bed, and carrying out forced air cooling on the conveying roller way and the straight long materials on a certain area of the cooling bed from top to bottom by adopting the fans;
(3) The roller speed is regulated, and the air quantity of each fan, the quantity of opened fans and the air quantity distribution are controlled to achieve a certain cooling rate
(4) When the hot straight long material reaches a proper final cooling temperature, the fan is turned off, and the straight long material is air-cooled along with roller way transportation.
The adoption of the forced air cooling technology for the control cooling of the thermal state straight long bar has a plurality of advantages:
1) The cooling speed of the straight long bar on the cooling bed is improved, and the cooling time of the bar is shortened;
2) The cooling speed of the straight strip long material is improved, austenite grains can be refined, the grain size grade of ferrite is improved, and the mechanical property of the hot rolled straight strip long material is improved;
3) The alloy content and the alloy cost of the steel are reduced under the condition of the same mechanical property according to the requirement;
4) Reducing the thickness of a decarburized layer in the cooling process after rolling the medium-high carbon steel straight strip;
5) Reducing the pearlite band grade of the hot rolled or normalized straight strip long material;
6) Abnormal tissue is prevented from being generated on the surface of the straight long material in the water cooling and fog cooling process;
7) The fixed-length shearing temperature of the long material of the large-size straight strip is reduced, and the head and tail bending of the long material is prevented.
Drawings
FIG. 1 is a schematic diagram of the equipment layout of the forced air cooling method of the cooling bed.
Wherein: 1-conveying roller way, 2-blower, 3-air duct, 4-air outlet, 5-hot rolling straight long bar and 6-cooling bed.
Detailed Description
The technical scheme of the utility model is further described below with reference to the specific embodiments.
Example 1: and (5) producing the hot-rolled straight ribbed steel bar.
The specification phi of the hot rolling production line is 12-32mm, after the steel bars are rolled by a single roll or cut and rolled, whether the steel bars pass through a water cooling device after rolling or not is determined according to the requirement, then the straight steel bars are conveyed into a cooling bed through a conveying roller way, and the cooling bed is a rack type stepping cooling bed which can realize the transverse movement and rotation of the steel bars.
Fans are arranged in sections in the length direction of the inlet end and are positioned on the side face of the cooling bed. For a production line without an overhead platform, the fans are arranged on the same basic platform as the cooling bed (fig. 1). For the overhead platform production line, the fans and the cooling bed are arranged on the same basic platform, and the fans can be arranged below the platform. The air at the outlet of the fan is uniformly distributed to the air outlet through the air duct, and the air outlet carries out forced air cooling on the conveying roller way and the straight long material on the cooling bed in a certain width area from top to bottom.
According to the steel bar specification and the production rhythm of a rolling line, the output wind speed or the wind quantity of each fan is set and adjusted, the full-length temperature uniformity of the hot-rolled straight long bar is controlled, the wind cooling speed and the wind cooling termination temperature of the straight long bar are controlled by adjusting the wind speed or the wind quantity of the fan and the conveying frequency of a cooling bed, the forced wind cooling speed range of the steel bar reaches 4-12 ℃/s, and the forced wind cooling final cooling temperature of the steel bar is controlled to 550-750 ℃ according to the mechanical property.
After forced air cooling after rolling is adopted, the cooling time required for 1 steel bars with different specifications to reach 600 ℃ can be greatly shortened compared with natural air cooling, the fixed-length shearing temperature of the steel bars with the diameters of 22-32mm is reduced by 110-200 ℃, the yield and tensile strength of the hot-rolled straight bar steel bars can be improved by 30-70MPa, and the elongation after breaking is almost unchanged. If similar mechanical properties are to be obtained, the steel bar with straight thread is produced by forced air cooling after rolling, so that the content of Si, mn and Cr alloy elements or Nb, V and Ti micro-alloy elements in the steel can be reduced, and the alloy cost is reduced.
Example 2: large and medium-sized bar production line
A forced air cooling method after rolling in a large and medium-sized bar hot rolling production line is suitable for producing bars with the specification range phi of 30-200mm, and the bars are subjected to rough rolling, medium rolling, finish rolling and sectional shearing and then are conveyed into a cooling bed through a conveying roller way, and the cooling bed can realize bar transverse movement and overturning in a stepping mode.
Fans are arranged in sections in the length direction of the inlet end of the cooling bed, and are positioned on the side face of the cooling bed. The high-speed air at the outlet of the fan is uniformly distributed to the air outlet through the air duct, and the air outlet performs forced air cooling on the large and medium bars on a certain width area of the cooling bed from top to bottom. According to the specification of large and medium-sized bars and the production rhythm of a rolling line, the output wind speed or the wind quantity of each fan is set and adjusted, the overall length temperature uniformity of the large and medium-sized bars is controlled, the wind speed or the wind quantity of the fans and the wind cooling speed and the wind cooling termination temperature controlled by the conveying frequency of a cooling bed are adjusted, the wind speed range is 2-6 m/s, and the final cooling temperature of forced wind cooling of the bars can be controlled to 550-750 ℃ according to the requirement.
After forced air cooling after rolling is adopted, the high-temperature residence time of the large and medium-sized bars is greatly shortened, the surface decarburization thickness of the medium and high carbon steel bars can be reduced by 20-30%, the level of pearlite band-shaped structures can be reduced by 0.5-1 level, the austenite grain size can be increased by about 0.5 level, the ferrite grain size can be increased by 0.5-1 level, and the metallographic structure type of the bars can be adjusted according to the requirement.
Example 3: and (5) a steel pipe hot rolling or normalizing heat treatment production line.
The forced air cooling method after rolling in the hot rolling or normalizing heat treated steel pipe production line is suitable for producing hot rolled seamless steel pipe with outer diameter in the specification range of phi 32-phi 550mm. The hot rolled seamless steel pipe after perforation, pipe rolling or and sizing reduction or the hot-state seamless steel pipe after normalizing and discharging from the furnace is conveyed into a cooling bed through a conveying roller way, and the cooling bed is in a stepping type or forward/reverse chain type, so that the transverse movement and rotation of the hot rolled seamless steel pipe can be realized.
Fans are arranged in sections in the length direction of the inlet end of the cooling bed, and are positioned on the side face of the cooling bed. The high-speed air at the outlet of the fan is uniformly distributed to the air outlet through the air duct, and the air outlet carries out forced air cooling on the hot-rolled seamless steel tube on a certain width area of the cooling bed from top to bottom. According to the specification of the hot-rolled seamless steel pipe and the production rhythm of a rolling line, the output wind speed or the wind quantity of each fan is set and adjusted, the full-length temperature uniformity of the hot-rolled seamless steel pipe is controlled, the wind speed or the wind quantity of the fan and the wind cooling speed and the wind cooling termination temperature controlled by the conveying frequency of a cooling bed are adjusted, the wind speed range is 2-12 m/s, and the final cooling temperature of forced wind cooling of the hot-rolled seamless steel pipe is adjusted according to the process requirement.
After forced air cooling is adopted, the high-temperature residence time of the hot rolled or normalized seamless steel tube is greatly shortened, and the surface decarburization thickness of the medium-high carbon steel type hot rolled seamless steel tube can be reduced by 20-30%; the pearlite band structure grade of the medium carbon steel can be reduced by 0.5-1 grade; the austenite grain size of the steel pipe can be increased by about 0.5 level, and the ferrite grain size can be increased by 0.5-1 level. The metallographic structure type of the hot-rolled seamless steel tube can be adjusted according to the requirement, the mechanical properties of the ferrite-pearlite type low alloy steel seamless steel tube can be improved by 10-50MPa according to different wall thicknesses, and the elongation is almost unchanged.
Example 4: hot-rolled section steel production line
A forced air cooling method after rolling in a hot rolled steel section production line is suitable for producing steel rails, I-beams, channel steel and angle steel with various specifications, after rough rolling and finish rolling, the hot rolled steel rails and the profile steel are conveyed into a cooling bed through a conveying roller way, and the cooling bed is in a stepping type, so that the transverse movement of the hot rolled steel rails and the profile steel can be realized.
Fans are arranged in sections in the length direction of the inlet end of the cooling bed, and are positioned on the side face of the cooling bed. The high-speed air at the outlet of the fan is uniformly distributed to the air outlet through the air duct, and the air outlet performs forced air cooling on the hot rolled steel rail and the profile steel on a certain width area of the cooling bed from top to bottom. According to the specifications of the hot rolled steel rail and the profile steel and the production rhythm of the rolling line, the output wind speed or the wind quantity of each fan is set and adjusted, the full-length temperature uniformity of the hot rolled steel rail and the profile steel is controlled, the wind speed or the wind quantity of the fan and the wind cooling speed and the wind cooling termination temperature controlled by the conveying frequency of the cooling bed are adjusted, the wind speed range is 2-6 m/s, and the final cooling temperature of the forced wind cooling of the hot rolled steel rail and the profile steel is adjusted according to the process requirement.
After forced air cooling after rolling is adopted, the high-temperature residence time of the hot rolled steel rail and the profile steel is greatly shortened, and the decarburized thickness of the surface layer of the high-carbon steel rail can be reduced by 20-30%. After forced air cooling is carried out on hot rolled I-steel, H-steel, channel steel and angle steel after rolling, the austenite grain size of the steel can be increased by about 0.5 level, the ferrite grain size can be increased by 0.5-1 level, the mechanical property of the steel can be increased by 15-40MPa, and the elongation is almost unchanged.
Claims (6)
1. The control cooling method of the thermal state straight long material is characterized by comprising the following steps of:
(1) The hot straight long material enters the cooling bed through the conveying roller way, and advances and rotates in the conveying process of the straight long material on the cooling bed;
(2) A fan is arranged in sections along the length direction of the cooling bed, and high-speed air at an air outlet of the fan carries out forced air cooling on hot straight long materials on a certain width area of the conveying roller way and the cooling bed from top to bottom;
(3) The full-length temperature uniformity of the hot straight long material is controlled by adjusting the output wind speed or the wind quantity of each fan, and the cooling speed and the air cooling termination temperature of the straight long material are controlled by adjusting the wind speed or the wind quantity of the fan and the conveying frequency of the cooling bed;
(4) When the hot straight long material reaches a proper final cooling temperature, the hot straight long material enters an air cooling area of the cooling bed for natural air cooling.
2. The method of controlled cooling of a hot straight strip of claim 1, wherein the hot straight strip comprises: hot-rolled straight bars, small, medium and large-sized hot-rolled or normalized heat-treated bars, hot-rolled or normalized heat-treated seamless tube steel pipes, and hot-rolled section steel of other shapes.
3. The method for controlled cooling of hot straight long bar according to claim 2, wherein the hot rolling line is regulated
After single rolling or splitting rolling, determining whether the steel bar passes through a water cooling device after rolling according to the requirement, and conveying the straight steel bar into a cooling bed through a conveying roller way, wherein the cooling bed is a rack type stepping cooling bed which can realize transverse movement and rotation of the steel bar;
fans are arranged in sections in the length direction of the inlet end and are positioned on the side face of the cooling bed; for a production line without an overhead platform, a fan and a cooling bed are arranged on the same basic platform; for an overhead platform production line, the fans and the cooling bed can be arranged on the same basic platform, and the fans can also be arranged below the platform; the air at the outlet of the fan is uniformly distributed to an air outlet through an air duct, and the air outlet carries out forced air cooling on the conveying roller way and the straight long materials on a certain width area of the cooling bed from top to bottom;
according to the steel bar specification and the production rhythm of a rolling line, the output wind speed or the wind quantity of each fan is set and adjusted, the full-length temperature uniformity of the hot-rolled straight long bar is controlled, the wind cooling speed and the wind cooling termination temperature of the straight long bar are controlled by adjusting the wind speed or the wind quantity of the fan and the conveying frequency of a cooling bed, the forced wind cooling speed range of the steel bar reaches 4-12 ℃/s, and the forced wind cooling final cooling temperature of the steel bar is controlled to 550-750 ℃ according to the mechanical property.
4. The method for cooling hot straight long bar according to claim 2, wherein the method for forced air cooling after rolling in the hot rolling line for large and medium bar is suitable for producing bar specification range
After rough rolling, middle rolling and finish rolling and sectionally shearing, conveying the large and medium-sized bars into a cooling bed through a conveying roller way, wherein the cooling bed can realize bar transverse movement and overturning in a stepping way;
the fans are arranged in sections in the length direction of the inlet end of the cooling bed, the fans are positioned on the side face of the cooling bed, high-speed air at the outlet of the fans is uniformly distributed to the air outlet through the air duct, the air outlet performs forced air cooling on large and medium bars in a certain width area of the cooling bed from top to bottom, the output air speed or air quantity of each fan is set and adjusted according to the specifications of the large and medium bars and the production rhythm of a rolling line, the full-length temperature uniformity of the large and medium bars is controlled, the air cooling speed and the air cooling end temperature controlled by adjusting the air speed or air quantity of the fans and the conveying frequency of the cooling bed are controlled, the air speed range is 2-6 m/s, and the final cooling temperature of the forced air cooling of the bars can be controlled to 550-750 ℃ according to requirements.
5. The method for controlled cooling of hot-state straight long steel according to claim 2, wherein for the forced air cooling method after rolling in the hot-rolled or normalized heat-treated steel tube production line, the outer diameter specification range of the hot-rolled seamless steel tube is adaptively produced
The hot rolled seamless steel pipe after perforation, pipe rolling or and sizing reduction or the hot-state seamless steel pipe after normalizing and discharging from the furnace is conveyed into a cooling bed through a conveying roller way, and the cooling bed is in a stepping type or forward/reverse chain type, so that the transverse movement and rotation of the hot rolled seamless steel pipe can be realized;
fans are arranged in sections in the length direction of the inlet end of the cooling bed, and are positioned on the side face of the cooling bed; the high-speed air at the outlet of the fan is uniformly distributed to an air outlet through an air duct, and the air outlet carries out forced air cooling on the hot-rolled seamless steel tube on a certain width area of the cooling bed from top to bottom; according to the specification of the hot-rolled seamless steel pipe and the production rhythm of a rolling line, the output wind speed or the wind quantity of each fan is set and adjusted, the full-length temperature uniformity of the hot-rolled seamless steel pipe is controlled, the wind speed or the wind quantity of the fan and the wind cooling speed and the wind cooling termination temperature controlled by the conveying frequency of a cooling bed are adjusted, the wind speed range is 2-12 m/s, and the final cooling temperature of forced wind cooling of the hot-rolled seamless steel pipe is adjusted according to the process requirement.
6. The hot-state straight long bar control cooling method according to claim 2, wherein for the forced air cooling method after rolling of the hot-rolled steel bar production line, the hot-rolled steel bar and the steel bar are adaptively produced into steel rails, I-steel bars, channel steel and angle steel with various specifications, after rough rolling and finish rolling, the hot-rolled steel rails and the steel bar are conveyed into a cooling bed through a conveying roller way, and the cooling bed is in a stepping type, so that the transverse movement of the hot-rolled steel rails and the steel bar can be realized;
fans are arranged in sections in the length direction of the inlet end of the cooling bed, and are positioned on the side face of the cooling bed; the high-speed air at the outlet of the fan is uniformly distributed to an air outlet through an air duct, and the air outlet carries out forced air cooling on hot rolled steel rails and profile steel on a certain width area of the cooling bed from top to bottom; according to the specifications of the hot rolled steel rail and the profile steel and the production rhythm of the rolling line, the output wind speed or the wind quantity of each fan is set and adjusted, the full-length temperature uniformity of the hot rolled steel rail and the profile steel is controlled, the wind speed or the wind quantity of the fan and the wind cooling speed and the wind cooling termination temperature controlled by the conveying frequency of the cooling bed are adjusted, the wind speed range is 2-6 m/s, and the final cooling temperature of the forced wind cooling of the hot rolled steel rail and the profile steel is adjusted according to the process requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211474059.5A CN116037645A (en) | 2022-11-22 | 2022-11-22 | Control cooling method for hot-rolled straight long bar after rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211474059.5A CN116037645A (en) | 2022-11-22 | 2022-11-22 | Control cooling method for hot-rolled straight long bar after rolling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116037645A true CN116037645A (en) | 2023-05-02 |
Family
ID=86126214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211474059.5A Pending CN116037645A (en) | 2022-11-22 | 2022-11-22 | Control cooling method for hot-rolled straight long bar after rolling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116037645A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116103576A (en) * | 2023-02-21 | 2023-05-12 | 北京科技大学 | Hot rolled ribbed straight bar with yield strength of 500MPa and manufacturing method thereof |
-
2022
- 2022-11-22 CN CN202211474059.5A patent/CN116037645A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116103576A (en) * | 2023-02-21 | 2023-05-12 | 北京科技大学 | Hot rolled ribbed straight bar with yield strength of 500MPa and manufacturing method thereof |
| CN116103576B (en) * | 2023-02-21 | 2024-05-24 | 北京科技大学 | Hot rolled ribbed straight bar with yield strength of 500MPa and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101327490B (en) | Method for producing good-quality high-carbon steel green rod for drawing | |
| CN102787278B (en) | Boron-containing weather-proof thin strip steel and manufacturing method thereof | |
| CN102787280B (en) | Boron-containing weather-proof thin strip steel and manufacturing method thereof | |
| JP2721861B2 (en) | Direct quenching method for hot rolled steel wire | |
| CN100376336C (en) | Ultrafast cooling device for wire and rod hot rolling production line | |
| CN104001741A (en) | Post-rolling cooling control method for small-size high-Cr 82B wire rods | |
| CN101185938A (en) | Method for producing steel bar with rib | |
| CN112501498A (en) | Wire rod for 2300MPa prestressed steel strand and production method thereof | |
| CN113403462B (en) | Preparation method of green-peel steel with yield strength of 700-1000 MPa | |
| CN116037645A (en) | Control cooling method for hot-rolled straight long bar after rolling | |
| CN112090956B (en) | Production control method of wire rod for low-segregation high-torsion bridge cable | |
| CN110527910A (en) | Anti-corrosion nano pearlite steel rail preparation method containing Rare-Earth Ce and Nb element | |
| CN109280760A (en) | Pearlite steel rail processing method | |
| CN109338076A (en) | Pearlite steel rail production method | |
| CN103667969A (en) | Method for producing steel strip through low-temperature online static recrystallization | |
| CN115505713B (en) | Heat treatment process for reducing residual stress of hundred-meter online heat-treated bainitic steel rail | |
| CN210816745U (en) | Cooling equipment capable of adapting to extremely short post-rolling cooling line of hot-rolled wide steel strip | |
| CN103451407B (en) | A kind of reinforcing bar batch heat-treating methods | |
| CN115446116A (en) | Production method of high-strength-plasticity 82B hot-rolled wire rod | |
| JP3101980B2 (en) | Direct quenching method for hot rolled steel wire | |
| CN100431724C (en) | Cold-rolling nicking reinforcing bar with rib high-strength and low relaxation, production and production line thereof | |
| CN113355496A (en) | On-line solution annealing process for rolling waste heat of stainless steel hot-rolled coil | |
| CN219297575U (en) | Continuous high-strength steel/wear-resistant steel production line | |
| CN110404987B (en) | Cooling equipment and method capable of adapting to cooling line after extremely short rolling of hot-rolled wide steel strip | |
| KR930010322B1 (en) | Large diameter high strength rolled steel bar and a process for the production of the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20230814 Address after: 100083 No. 30, Haidian District, Beijing, Xueyuan Road Applicant after: University OF SCIENCE AND TECHNOLOGY BEIJING Applicant after: NANTONG DIVAT ENERGY SAVING BLOWER CO.,LTD. Address before: 100083 No. 30, Haidian District, Beijing, Xueyuan Road Applicant before: University OF SCIENCE AND TECHNOLOGY BEIJING |
|
| TA01 | Transfer of patent application right |