CN104726661A - Method and system for producing steel products - Google Patents
Method and system for producing steel products Download PDFInfo
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- CN104726661A CN104726661A CN201510160358.5A CN201510160358A CN104726661A CN 104726661 A CN104726661 A CN 104726661A CN 201510160358 A CN201510160358 A CN 201510160358A CN 104726661 A CN104726661 A CN 104726661A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005096 rolling process Methods 0.000 claims abstract description 80
- 238000004519 manufacturing process Methods 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 50
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 30
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 26
- 239000013078 crystal Substances 0.000 claims description 22
- 230000033001 locomotion Effects 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000010792 warming Methods 0.000 claims description 8
- 238000003801 milling Methods 0.000 claims description 6
- 239000010425 asbestos Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 229910052895 riebeckite Inorganic materials 0.000 claims description 4
- 238000010583 slow cooling Methods 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- 229910006639 Si—Mn Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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- Metal Rolling (AREA)
Abstract
The invention discloses a method for producing steel products. The method comprises the following steps: controlling to cool a rolled piece and controlling the cooling temperature of the rolled piece to be higher than the martensite generating temperature of the rolled piece so as to realize that the rolled piece is located within a controlled rolling region; recovering the temperature of the rolled piece within the controlled rolling region to arouse heat exchange between the surface and the core of the rolled piece; controlling to roll the rolled piece after the temperature is recovered to thin the austenite grains of the rolled piece; quickly cooling the austenite grain thinned rolled piece to obtain supercooled austenite and controlling the temperature of the rolled piece to be higher than the martensite generating temperature of the rolled piece; and controlling to slowly cool the rolled piece with the supercooled austenite by use of an attemperator. The method is capable of obtaining high-quality steel product properties such as high strength and high toughness by controlling cooling and rolling and realizing refined crystalline strengthening of the steel products. The invention also discloses a steel product producing system for implementing the steel product production method.
Description
Technical field
The present invention relates to materials processing manufacturing technology field, particularly a kind of steel production method and system.
Background technology
In recent years, steel production capacity surplus, market competition are growing more intense, at steel manufacture and manufacture field, and the novel technique that a large amount of steel production enterprise exigence finds a kind of steel to produce, change existing steel production status, producing for steel provides more efficient, energy-conservation method.
In existing production, rolling line mostly adopts the decoration form rolling straight carbon steel, structural low alloy steel etc. of roughing mills 6 frame, intermediate mill 6 frame, finishing train 6 frame in order to make the intensity of steel be up to state standards, and generally adopts and adds microalloy or online immediate quenching means.
Adopt micro-alloying technology to be conducive in steel, form tiny carbide and nitride, usual tiny carbonitride particle plays the effect of pinning crystal boundary, stops Austenite Grain Growth reheating in steel billet process.In Controlled Cooling process, stop the recrystallize of deformed austeaite, delay recrystallize Austenite Grain Growth.The alligatoring of welded heat affecting zone crystal grain is stoped in welding process.By the Precipitation of carbonitride, significantly improve the intensity of microalloyed steel.But when rolling common building steel, a large amount of micro-alloy vanadium of adding controls grain growth with interpolation Si-Mn alloy, considerably increases the cost of raw material like this.
Compared with employing micro-alloying technology, adopt online preheating quenching technology steel low relative to production cost.Main method utilizes rolled piece high-temperature residual heat to quench, and rolled piece surface can be made to form martensite, but the core of rolled piece is still austenite.Because rolled piece core heat outwards transmits, surface martensite tempering, produce tempered martensite, core changes nodular troostite tissue into, thus obtain the weave construction of high-yield strength and high ductility, but product performance fluctuation is large, poor seismic behavior, for welding and being threaded difficult, cause having forbidden adopting producing in this way in national standard.
In view of above-mentioned two kinds of methods all exist certain problem, iron and steel manufactures field to be needed to change the processing method to Steel Rolling, explore a kind of new Steel Rolling production technique to arrange, to reduce the use of alloy and microalloy, reduce production cost, improve the quality of products simultaneously, produce intensity is high, plasticity and toughness good, welding property is excellent the close grain hot-rolled ribbed steel of heat and excellent special steel.
In sum, how providing a kind of output High Strength Steel production method, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
In view of this, the object of this invention is to provide a kind of steel production method, the method can produce the steel of high strength.Another object of the present invention is to provide a kind of steel production system, and this system can ensure the application in practice of steel production method, produces the steel of high strength.
For achieving the above object, the invention provides following technical scheme:
A kind of steel production method, comprising:
Controlled cooling model rolled piece, and the cooling temperature controlling described rolled piece generates Martensite temperature higher than described rolled piece, is in controlled rolling district to realize described rolled piece;
Be in the temperature of the rolled piece in controlled rolling district described in reply, make the surface of described rolled piece and core carry out heat exchange;
Rolled piece after temperature reply described in the rolling of controlled rolling district, with the austenite crystal of rolled piece described in refinement;
Rolled piece after the described Austenite Grain Refinement of quick cooling, to obtain supercooled austenite, the temperature controlling described rolled piece generates martensitic temperature higher than described rolled piece;
The rolled piece obtaining supercooled austenite described in control carries out slow cooling by attemperator.
Preferably, the method for described controlled cooling model rolled piece, comprises the method cooling rolled piece using Water cooling further.
Preferably, the method for the rolled piece after the described Austenite Grain Refinement of described quick cooling, comprises further and uses the method for Water cooling to cool described rolled piece fast.
Preferably, described in described reply, be in the temperature of the rolled piece in controlled rolling district, make the surface of described rolled piece and core carry out the method for heat exchange, comprise further:
Control the surface of described rolled piece or temperature gap consistent with the temperature of core in a threshold value.
A kind of steel production system, comprises for cooling rolled piece, controls described rolled piece and be in first refrigerating unit in controlled rolling district, the reply section apparatus for replying described rolled piece temperature, the rolling unit, the second refrigerating unit described rolled piece being carried out to cooling fast, cold bed and the attemperator that are rolled described rolled piece;
The output terminal of described first refrigerating unit is connected with the input terminus of described reply section apparatus, the output terminal of described reply section apparatus is connected with the input terminus of described rolling unit, the output terminal of described rolling unit is connected with the input terminus of described second refrigerating unit, the output terminal of described second refrigerating unit is connected with the input terminus of described cold bed, and described cold bed is provided with described attemperator.
Preferably, described rolling unit comprises two to five milling trains.
Preferably, described first refrigerating unit and/or described second refrigerating unit are Water cooling device.
Preferably, described attemperator comprises motion bar, and the middle part of described motion bar is hinged on described cold bed side, and one end of described motion bar is provided with pendulum, and the other end of described motion bar is provided with the warming plate for covering on above described cold bed.
Preferably, described warming plate comprises for heat insulation asbestos plate.
A kind of steel production method provided by the invention, by controlling the temperature entering rolling unit rolled piece, make rolled piece temperature within the scope of controlled rolling district, then by replying section, the internal-external temperature difference of rolled piece is reduced, avoid because the outer cold rolling deformation caused of heat in rolled piece is uneven and change that is crystal grain is large, the temperature of rolled piece is controlled again after rolling completes, rolled piece can not be cooled to and can generate in martensitic temperature range, and keep the temperature of the supercooled austenite of described rolled piece, control the generation of the tissues such as the ferrite and pearlite of rolled piece; And control temperature, avoid martensitic generation.Whole process is by control temperature and controlled rolling, avoid rolling rear martensitic generation, make martensitic ratio of organizing in the rolled piece of local few, effectively can avoid the problem that rolled piece fragility is higher, strong flexor ratio is inadequate because martensite too much causes, substantially increase the performance of rolled piece.
A kind of steel production system that the present embodiment provides, by rolling the attemperator on front refrigerating unit, rolling unit, roller repairing device and cold bed, in the operation of rolling, rolled piece can be made to be in below crystal grain recrystallization temperature all the time, and by controlled cooling model device, the strict ferrite crystal grain that controls is grown up, the finished product are made to obtain tiny and uniform crystal grain, reach the high-quality steel performance of high strength, high tenacity, realize the refined crystalline strengthening of steel.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, also can obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the schema of a kind of steel production method specific embodiment provided by the present invention;
Fig. 2 is the structural representation of a kind of steel production system specific embodiment provided by the present invention;
Fig. 3 is the structural representation of attemperator in a kind of steel production system specific embodiment provided by the present invention.
Wherein, 1 is the first refrigerating unit, and 2 for replying section apparatus, and 3 is rolling unit, and 4 is the second refrigerating unit, and 5 is attemperator, and 6 is cold bed, and 501 is motion bar, and 502 is warming plate, and 503 is pendulum.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Core of the present invention is to provide a kind of steel production method, and the method can produce the steel of high strength.Another core of the present invention is to provide a kind of steel production system, and this system can ensure the application in practice of steel production method, produces high strength and high performance steel.
Please refer to Fig. 1, Fig. 1 is the schema of a kind of steel production method specific embodiment provided by the present invention.
A kind of steel production method disclosed in the present embodiment, concrete steps comprise:
Step S101: controlled cooling model rolled piece, and the cooling temperature controlling rolled piece generates Martensite temperature higher than rolled piece, is in controlled rolling district to realize rolled piece;
Step S102: reply the temperature being in the rolled piece in controlled rolling district, make the surface of rolled piece and core carry out heat exchange;
Step S103: the rolled piece after the reply of controlled rolling district rolling temperature, with the austenite crystal of refinement rolled piece;
Step S104: the rolled piece fast after cooling Austenite Grain Refinement, to obtain supercooled austenite, the temperature controlling rolled piece generates martensitic temperature higher than rolled piece;
Step S105: the rolled piece controlling to obtain supercooled austenite carries out slow cooling by attemperator.
In aforesaid method, first original finishing mill rolling pass can be reduced, the passage of minimizing is displaced in the step of controlled rolling district rolling below, the rolled piece temperature rise that reduction causes due to multi-pass deformation during original finishing train rolling is too high, rolled piece after original finishing train rolling is cooled, by the method for cooling, the temperature of rolled piece is reduced, control rolled piece and be in controlled rolling district, namely 720 to 860 DEG C within the scope of this, object is to ensure in follow-up rolling and process of cooling, rolled piece Austenite Grain Growth when can not cause rolling because rolled piece is still in more than recrystallization temperature, and logical overcooled method control temperature, suppress the precipitation of ferrite crystal grain, and transit out of many perlite.
Under normal circumstances, when rolled piece is by higher temperatures, as austenite transformation temperature more than 720 DEG C, carry out acceleration cooling, after temperature drops to and can generate martensitic temperature, if rolled piece continues to keep cooling situation, then can produce martensite in rolled piece, cause that the hardness of rolled piece is higher, fragility is larger.In order to avoid rolled piece is excessively crisp, then need temperature control during the course, control rolled piece and be in controlled rolling district, namely 720 to 860 DEG C within the scope of this, the temperature avoiding the temperature making rolled piece to be reduced to martensitic stucture generating.But, in the operation of rolling of reality, the local of rolled piece inevitably drops to and generates martensitic temperature, and generate the martensite of minute quantity, main operation in the present embodiment is exactly to control by control temperature in extremely low scope by the martensitic stucture in rolled piece, reduces the impact because martensitic existence produces rolled piece performance as far as possible.
In step S102, in the process that rolled piece temperature is replied, the heat of rolled piece inside and outside is exchanged, and then temperature more reach unanimity.Internal-external temperature difference easily causes rolling deformation inequality, core coarse grains.The scheme of the present embodiment makes rolled piece walk a segment distance in atmosphere, and rolled piece core heat diffusion can be made in the process to surface.This mainly in order to avoid next step be rolled time, the nonaffine deformation of the rolled piece that rolled piece internal-external temperature difference causes more greatly.
Optionally, in above-mentioned steps 102, segment length can be replied further by change, limit the degree of inside and outside thermal exchange, by controlling the surface of rolled piece or temperature gap consistent with the temperature of core in a threshold value, namely ensureing that the temperature of rolled piece surface and core is fully transmitted as far as possible and making the surperficial and core temperature of rolled piece reach unanimity or remain in less error as far as possible.
By rolling technology in step S103, carry out the rolling of rolled piece in above-mentioned controlled rolling district, by broken for the austenite crystal of rolled piece refinement, obtain the austenite crystal of smaller size smaller.
Optionally, the rolling rolling stock that above-mentioned steps S103 mentions, the method for refinement rolled piece crystal grain, can be specially employing controlled rolling, the crystal grain of broken refinement rolled piece.In the operation of rolling, because the temperature entering milling train is low, be in controlled rolling district, and rolling unit rolling pass is few, rolled piece can be made to be in below crystal grain recrystallization temperature all the time, can farthest avoid the rising of rolled piece Yin Wendu and the rolled piece crystal grain that causes becomes large.
In step S104, lower the temperature to rolled piece, in this process, the crystal grain of rolled piece no longer becomes large again; By the decline of temperature, in rolled piece, ferritic composition proportion is minimized; Accordingly, rolled piece Medium pearlite composition proportion is made to be improved.
Optionally, the method for the controlled cooling model rolled piece that aforesaid method relates to, and/or cooling rolled piece obtains the method for supercooled austenite fast, comprises further and uses the method for Water cooling to cool.
In step S105, lowered the temperature slowly by the rolled piece obtaining supercooled austenite by the device being used for being incubated, in the process, the temperature of rolled piece is reduced slowly.
Steel production method disclosed in above-described embodiment, decrease original finishing mill rolling pass, the rolled piece temperature rise that reduction causes due to multi-pass deformation during original finishing train rolling is too high, by the rolled piece after original finishing train rolling is cooled, by the method for cooling, the reduction of the temperature of rolled piece is rolled again, and by water cooling plant control temperature, suppress the speed of separating out of ferrite crystal grain, and transit out of many perlite.Also by controlling scope and the speed of rolled piece cooling, inhibit martensitic generation.
In above-mentioned processing method, the committed step of the present embodiment is illustrated, other steps in steel production process, all can with reference to prior art.
Except a kind of steel production method disclosed in above-described embodiment, the present invention also provides a kind of steel production system.Please refer to Fig. 2 and Fig. 3, Fig. 2 is the structural representation of a kind of steel production system specific embodiment provided by the present invention; Fig. 3 is the structural representation of attemperator in a kind of steel production system specific embodiment provided by the present invention.
The steel production system that the present embodiment provides mainly comprises the first refrigerating unit 1, replys section apparatus 2, rolling unit 3, second refrigerating unit 4, cold bed 6 and attemperator 5.
As shown in Figure 2, said apparatus connects respectively successively, concrete, the output terminal of the first refrigerating unit 1 is connected with the input terminus of replying section apparatus 2, the output terminal of replying section apparatus 2 is connected with the input terminus of rolling unit 3, the output terminal of rolling unit 3 is connected with the input terminus of the second refrigerating unit 4, and the output terminal of the second refrigerating unit 4 is connected with the input terminus of cold bed 6, and cold bed 6 side is provided with attemperator 5.Above-mentioned connection portion all can adopt roller-way transmission.
First refrigerating unit 1 is for cooling the rolled piece before entering rolling unit 3, and the temperature controlling rolled piece is in controlled rolling district, namely 720 to 860 DEG C within the scope of this.
Replying section apparatus 2 for replying the temperature of rolled piece, making the surface of rolled piece and core carry out heat exchange; Reply section apparatus 2 be connected with the input terminus of rolling unit 3, rolling unit 3 for being rolled rolled piece in controlled rolling district, the austenite crystal of refinement rolled piece.
Second refrigerating unit 4, for cooling rolled piece fast, obtains supercooled austenite, and control is by controlled cooling model temperature, suppresses ferrite crystal grain to be separated out, generate many pearlitic structures, and the temperature of rolled piece generates martensitic temperature higher than rolled piece.
Attemperator 5 is for being incubated the carrying out of rolled piece, but while insulation, the temperature of rolled piece still can reduce slowly, in the process of this slow cooling, the generation of ferrite minimizing, pearlitic structure in rolled piece, and controlled cooling model temperature, avoid the generation of the tissues such as martensite.
Arrange according to the connection of said system, above-mentioned steel production method can be made to be achieved in reality.
Optionally, the number that rolling unit 3 comprises milling train comprises two to five.Rolling unit 3 milling train quantity is few, and total deformation is little, can't produce amount of heat in working process, just ensure that rolled piece can not rise too high and the grain growth caused by Yin Wendu.
Optionally, in rolling unit 3, the quantity of milling train can reduce further, arranges the rolling unit of less frame, makes rolled piece by the rolling of few passage, temperature rise can be made further to be unlikely to too high, to such an extent as to make grain growth.
Optionally, the type of roller mill can be the mill types such as two roller horizontal mills, two roller vertical mills, y-type three-roll mill, or their combination.
Optionally, above-mentioned first refrigerating unit 1 or the second refrigerating unit 4 can be Water cooling device.Utilize the material of water-cooling pattern to steel one class to cool comparatively suitable, but be also not limited to and utilize water-cooling pattern or utilize Water cooling device, all can be used for the scheme that the method that steel cool all be can be used as to the present embodiment.
Optionally, reply section apparatus 2 mainly by roller-way by rolled piece to front transfer, or transmitted by guide groove, when rolled piece is walked in guide groove air, core heat diffusion is to surface.
Optionally, attemperator 5 comprises motion bar 501, and the middle part of motion bar 501 is hinged on cold bed 6 side, and one end of motion bar 501 is provided with pendulum 503, and the other end of motion bar 501 is provided with warming plate 502.Optionally, the structural shape etc. of attemperator 5 is not limited to aforesaid way, also can select the modes such as motorized motions.After attemperator 5 is arranged at cold bed 6 front mill table, and be arranged on the top of cold bed 6 tooth plate, according to different rolling technology demands, the state of attemperator 5 can be changed, manipulate it and open or close.When rolled piece is transferred to directly over cold bed 6 tooth plate time, attemperator 5 puts down, be placed in directly over rolled piece, because rolled piece itself has certain temperature, around rolled piece, the gas of comparatively high temps is because of warm air aggravating reason, can upwards float, but warming plate 502 is directly over rolled piece, can effectively stop the gaseous exchange around rolled piece with comparatively high temps, in guarantee rolled piece certain hour, temperature is stable.
Optionally, warming plate 502 comprises for heat insulation asbestos plate, and the heat-insulating capability of asbestos plate is good, can effectively stop the warm air near rolled piece to rise fast, ensure that the stable of rolled piece temperature.
Optionally, the quantity of said apparatus and device length is not by the restriction of the present embodiment, can carry out as the case may be adjusting, increasing or suitable minimizing, the scheme provided based on the present embodiment and the similar scheme produced, within the scope that all should belong to the present embodiment.
A kind of steel production system that the present embodiment provides, by the first refrigerating unit 1, replys the steel production system that the attemperator 5 that section apparatus 2, rolling unit 3, second refrigerating unit 4, cold bed 6 and cold bed 6 are arranged forms complete set.
In the operation of rolling, rolled piece can be made to be in below the temperature of crystal grain recrystallize all the time, and by controlled cooling model device, strictly to control grain growth, make the finished product obtain tiny and uniform ferrite and pearlite crystal grain, reach the high-quality steel performance of high strength, high tenacity.
In addition, the system that the present embodiment provides, improves the intensity of steel by controlled rolling and controlled cooling, so in steel-making link, can reduce the usage quantity of alloy and microalloy, the refining cost of saving steel, for manufacturing enterprise provides energy-efficient preparation system.
The structure of other each several parts of above-mentioned steel production system please refer to prior art, repeats no more herein.
Above a kind of steel production method provided by the present invention and system are described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, also can carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (9)
1. a steel production method, is characterized in that, comprising:
Controlled cooling model rolled piece, and the cooling temperature controlling described rolled piece generates Martensite temperature higher than described rolled piece, is in controlled rolling district to realize described rolled piece;
Be in the temperature of the rolled piece in controlled rolling district described in reply, make the surface of described rolled piece and core carry out heat exchange;
Rolled piece after temperature reply described in the rolling of controlled rolling district, with the austenite crystal of rolled piece described in refinement;
Rolled piece after the described Austenite Grain Refinement of quick cooling, to obtain supercooled austenite, the temperature controlling described rolled piece generates martensitic temperature higher than described rolled piece;
The rolled piece obtaining supercooled austenite described in control carries out slow cooling by attemperator.
2. steel production method according to claim 1, is characterized in that, the method for described controlled cooling model rolled piece, comprises the method cooling rolled piece using Water cooling further.
3. steel production method according to claim 2, is characterized in that, the method for the rolled piece after the described Austenite Grain Refinement of described quick cooling, comprises further and uses the method for Water cooling to cool described rolled piece fast.
4. steel production method according to claim 3, is characterized in that, is in the temperature of the rolled piece in controlled rolling district described in described reply, makes the surface of described rolled piece and core carry out the method for heat exchange, comprises further:
Control the surface of described rolled piece or temperature gap consistent with the temperature of core in a threshold value.
5. a steel production system, it is characterized in that, comprise for cooling rolled piece, control described rolled piece and be in first refrigerating unit (1) in controlled rolling district, the reply section apparatus (2) for replying described rolled piece temperature, rolling unit (3), the second refrigerating unit (4) described rolled piece being carried out to cooling fast, cold bed (6) and attemperator (5) that described rolled piece is rolled;
The output terminal of described first refrigerating unit (1) is connected with the input terminus of described reply section apparatus (2), the output terminal of described reply section apparatus (2) is connected with the input terminus of described rolling unit (3), the output terminal of described rolling unit (3) is connected with the input terminus of described second refrigerating unit (4), the output terminal of described second refrigerating unit (4) is connected with the input terminus of described cold bed (6), described cold bed (6) is provided with described attemperator (5).
6. steel production system according to claim 5, is characterized in that, described rolling unit (3) comprises two to five milling trains.
7. steel production system according to claim 6, is characterized in that, described first refrigerating unit (1) and/or described second refrigerating unit (4) are Water cooling device.
8. steel production system according to claim 7, it is characterized in that, described attemperator (5) comprises motion bar (501), the middle part of described motion bar (501) is hinged on described cold bed (6) side, one end of described motion bar (501) is provided with pendulum (503), and the other end of described motion bar (501) is provided with the warming plate (502) for covering on described cold bed (6) top.
9. steel production system according to claim 8, is characterized in that, described warming plate (502) comprises for heat insulation asbestos plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114713627A (en) * | 2022-02-21 | 2022-07-08 | 南京钢铁股份有限公司 | A rolling method for improving the uniformity of the thick plate structure by using the intermediate billet water penetration device |
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| CN2803549Y (en) * | 2005-04-05 | 2006-08-09 | 鞍山市润辉冶金设备制造有限公司 | Thermal insulation cover on transferring roller way of continuous casting and rolling set for hot rolled strips |
| CN101367093A (en) * | 2008-08-22 | 2009-02-18 | 马鞍山钢铁股份有限公司 | A controlled rolling and controlled cooling process for hot-rolled ribbed steel bar |
| US20130174941A1 (en) * | 2010-11-19 | 2013-07-11 | Posco | High-Strength Steel Material Having Outstanding Ultra-Low-Temperature Toughness and a Production Method Therefor |
| CN103555913A (en) * | 2013-11-07 | 2014-02-05 | 首钢总公司 | Control method for improving plasticity of bearing steel wire rod |
| CN204676122U (en) * | 2015-04-07 | 2015-09-30 | 冯宗茂 | A kind of steel production system |
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| CN114713627A (en) * | 2022-02-21 | 2022-07-08 | 南京钢铁股份有限公司 | A rolling method for improving the uniformity of the thick plate structure by using the intermediate billet water penetration device |
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