CN102747213B - Cooling method for continuous heat treatment of high-strength steel - Google Patents
Cooling method for continuous heat treatment of high-strength steel Download PDFInfo
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- CN102747213B CN102747213B CN201110101797.0A CN201110101797A CN102747213B CN 102747213 B CN102747213 B CN 102747213B CN 201110101797 A CN201110101797 A CN 201110101797A CN 102747213 B CN102747213 B CN 102747213B
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Abstract
The invention discloses a cooling method for continuous heat treatment of a high-strength steel, which comprises the following steps: 1) performing air injection slow-cooling on the strip steel surface of an soaking zone passed through a continuous annealing furnace; 2) using an aerosol cooling device to inject cooling water aerosol on the strip steel surface for aerosol cooling; 3) using a cooling water injection apparatus to inject layered water column on the strip steel surface, wherein the included angle of the injection direction of the layered water column and the moving direction of the strip steel presents an acute angle; 4) using a first nozzle apparatus to inject high speed water flow on the strip steel surface, wherein the speed arrangement of the high speed current can be set as to blow the steam bubbles and vapor films on the strip steel surface away; 5) soaking the strip steel in cooling water, using a second nozzle provided under the liquid surface of the cooling water to inject high speed water flow to the strip steel surface, blowing the steam bubbles and vapor films on the strip steel surface away by the high speed current; and 6) drying the cooling water on the strip steel surface.
Description
Technical field
The present invention relates to the method for cooling of cold rolled strip, relate in particular to a kind of method of cooling of high-strength steel.
Background technology
Along with the development of industrial technology and the raising of modern metallurgic product performance, the market requirement of cold rolling high-strength steel and super-high strength steel is increasing.At present, in order to reduce the content of high tensile steel plate alloying element, reduce the production cost of high-strength steel, improve the welding property of steel plate and manufacturability can (comprise operations such as being easy to continuous casting, hot rolling, pickling, trimming, cold rolling, annealing produce) simultaneously, conventionally need to after steel plate annealing, carry out quick cooling process.At present conventional method for rapid cooling normally adopt after steel plate slow cooling high hydrogen jet cooling, aerosol is cooling or shrend cooling carry out cooling fast.
Although the cooling even belt plate shape of the jet method of cooling of high hydrogen is better, but high hydrogen sprays cooling speed of cooling is usually less than 150 ℃/s (the band steel for 1mm thickness), speed of cooling is slow, cannot meet the thermal treatment process requirement of AHSS plate, particularly ultrahigh-strength steel plates.
Traditional shrend method or speed of cooling are inadequate, or speed of cooling is not controlled, and the cooling uniformity of traditional shrend method is all poor, and the band steel of production easily produces performance inequality, the bad problem of plate shape.
Publication number is US4330112, open day is May 18 nineteen eighty-two, name is called " the band steel refrigerating unit of continuous annealing production line " (Apparatus for cooling a steel strip in a continuous annealing line) United States Patent (USP) and discloses a kind of shrend method of cooling, the method adopts the device cooling zone steel shown in Fig. 1: first with water pump 12, from the interior extraction water coolant of hardening groove 11, through pipeline, deliver to jet apparatus 13 and be ejected into belt steel surface and carry out coolingly, then band steel immersion hardening groove 11 is carried out cooling.The method is relatively suitable for the cooling fast of low temperate zone steel, the band steel of 400 ℃ of left and right can be cooled to below 60～95 ℃, but have the following disadvantages: (1) scope of application is narrower, the shrend that is only applicable to low temperate zone steel is produced, and is difficult to be applied to high-temperature water quenching (under normal production rate, the thermal zone steel of 700 ℃ of left and right being cooled to below 90 ℃); (2) cooling zone steel produces water smoke and water vapour are easy to enter in stove above, make equipment corrosion serious; (3) start to spray cooling place, spray the cooling water capacity and easily splash, cause band steel inhomogeneous cooling and plate shape bad.
In addition, when adopting traditional immersed type shrend method cooling down high-temperature band steel, because belt steel temperature before shrend is too high, a large amount of bubble that shrend process produces and steam film can hinder further cooling fast with steel, with steel, at the high-speed cruising of watch-quench tank, the big ups and downs of spray sputter and watch-quench tank liquid level will be produced in addition, these have all caused the asynchronism(-nization) step of thermal zone steel contact cooling water on width while starting shrend, thereby cause speed of cooling there are differences, also cause the band molten steel inhomogeneous cooling of quenching, performance is uneven and plate shape is bad, and more high-performance is more inhomogeneous with the intensity of steel, plate shape is poorer.
Summary of the invention
The method of cooling that the object of this invention is to provide a kind of high-strength steel continuous heat treatment, this method of cooling can realize and reach larger and controlled average cooling rate when cooling with steel, realization is cooling fast with steel, can also guarantee simultaneously cooling evenly produce with steel, there is good plate shape.The method by adopt in short-term gas slow cooling+aerosol cooling+the cooling method of shrend, make in the situation that add a small amount of alloying element in the substrate of steel plate, can produce the advanced high-strength steel product that strength grade is higher, and by the heat treated speed of cooling of flexible band steel, produce the phase transformation strengthening high-strength steel product with various intensity ranks, guarantee that this high-strength steel product has more performance uniformly, better plate shape simultaneously.
The present invention, according to foregoing invention object, provides a kind of method of cooling of high-strength steel continuous heat treatment, and it comprises the following steps:
(1) belt steel surface through continuous annealing furnace soaking zone is carried out to jet slow cooling;
(2) adopting a gas-mist cooling device to spray cooling aqueous vapor mist, that belt steel surface is carried out to aerosol is cooling;
(3) adopt a cooling water jet unit to spray stratiform water column to belt steel surface, the injection direction of layered water column is acute angle angle with the direct of travel with steel;
(4) adopt one first tuyere arrangement to spray high velocity flow to belt steel surface, the speed of described high velocity flow is set to the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off;
(5) band steel is immersed in water coolant, and adopts one to be arranged at the subsurface second nozzle device of water coolant and to spray high velocity flow to belt steel surface, the speed of described high velocity flow is set to the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off;
(6) water coolant of belt steel surface is dried.
First the technical program carries out jet slow cooling to the band steel through continuous annealing furnace soaking zone, this is because it can be according to high-intensity band steel flexible slow cooling temperature and the scope of varying strength rank and thermal treatment process requirement, thereby accommodation zone steel starts cooling temperature fast, and then realizes the significantly adjusting with steel average cooling rate and cooling curve.
Aerosol is cooling is a kind of gas and water droplet two phase flow method of cooling, although it compares with simple shrend method the shortcoming that has speed of cooling on the low side, it also tool have the following advantages:
(1) its coefficient of heat transfer can reach 5000～10000kcal/m2.h. ℃, much larger than jet cooling (even high concentration hydrogen is cooling, also can only reach 750kcal/m2.h. ℃);
(2) it can control speed of cooling by regulating pondage, and controllability is strong, easily realizes the accurate control with the cooling terminal temperature of steel;
(3) aerosol is cooling adjustable controlled in strip width direction, is conducive to form good plate shape with steel.
Therefore, the technical program arranges aerosol cooling section (gas-mist cooling device) between slow cooling section (step 1) and shrend cooling section (step 3-5), realization is with the lifting gradually of steel rate of cooling in process of cooling, so not only can greatly shorten the length of leer section, improve with steel the average rate of cooling in whole process of cooling, can also solve preferably that traditional shrend method exists because entering water temp with steel compared with the high inhomogeneous cooling producing, performance inequality and the bad problem of plate shape, thereby can meet preferably other AHSS plate of different steel grade different intensity scales, particularly ultrahigh-strength steel plates is to the processing requirement of thermal treatment speed of cooling and specification of quality, guarantee to add in the substrate of steel plate under the condition of a small amount of alloying element, produce the AHSS plate of the various intensity ranks with good plate shape, improve its use properties and reduce high-strength steel production cost.
In addition, the technical program is in order to guarantee to be with steel contact cooling water equably when the shrend, and avoid the water droplet splashing before shrend starts, just to touch belt steel surface, realization is simultaneously cooling fast with steel, it is by the cooling band steel of process aerosol, first adopt cooling water jet unit on band steel, under (a left side, the right side) jet surface is uniform along strip width direction, stable stratiform water column, and the injection direction of this stratiform water column is acute angle with the formed angle of band steel traffic direction, it is evenly cooling that stratiform water column can guarantee to be with steel all can obtain on width, even if being acute angle angle with band steel direct of travel, the injection direction of stratiform water column can guarantee that there is water-drop sputtering stratiform water column below, also can be blocked by water column, can not touch the band steel starting before shrend.And then adopt the first tuyere arrangement to spray high velocity flow to belt steel surface, for quick cooling zone steel further, simultaneously it is the vapor bubbles of belt steel surface and the steam film band steel that blows off fast, equably, evenly makes strip property evenly and obtains good plate shape guaranteeing with steel is cooling.It should be noted that, the speed of the high velocity flow in the technical program needs specifically to regulate according to the concrete condition of production, its final velocity should be able to that (vapor bubbles and steam film are in the shrend step of having carried out by the vapor bubbles of belt steel surface and steam film, because the water coolant of low temperature runs into forming at belt steel surface with steel of high temperature) the band steel that blows off fast, equably, the vapor bubbles of these belt steel surfaces or steam film can affect with the speed of cooling of steel and cooling uniformity.Finally, by band steel be immersed in water coolant, carry out cooling, below the liquid level of water coolant, adopt second nozzle device to spray high velocity flow to band steel simultaneously, flowing near water coolant reinforcing band steel, thereby the speed of cooling of reinforcing band steel, the vapor bubbles simultaneously belt steel surface shrend process being produced and the vapor film belt steel surface that blows off rapidly, improves shrend effect.
Preferably, the injection direction of the high velocity flow in described step (5) is acute angle angle with band steel direct of travel, can reduce like this fluctuation of water coolant liquid level and the detrimentally affect that spray sputter causes belt plate shape.
Alternatively, the injection direction of the high velocity flow in described step (4) is vertical with the direct of travel with steel.
Preferably, the injection direction of the high velocity flow in described step (4) is acute angle angle with the direct of travel with steel, and it can prevent that water-drop sputtering is to the disadvantageous effect with steel cooling performance.
The temperature of the water coolant preferably, adopting in described step (2)-(5) is below 70 ℃.
The temperature of the water coolant further preferably, adopting in described step (2)-(5) is below 50 ℃.
Further preferably, the water coolant adopting in described step (2)-(5) is refrigerated water.When the technical program adopts refrigerated water as shrend heat-eliminating medium, in the starting stage with steel contact cooling water, although the water temperature of refrigerated water raises, can not generate bubble, thereby guarantee that band steel is cooling equably.
Preferably, the cooling water jet unit adopting in described step (3) is water cutter.
Preferably, the gas-mist cooling device adopting in described step (2) have gas orifice and with the vertically disposed water outlet of described gas orifice, the gas direction (being also aerosol injection direction) of described gas orifice ejection is vertical with band steel direct of travel, and vertical with the water (flow) direction of water outlet ejection, near belt steel surface, gas-liquid two-phase forms described water coolant aerosol.
When the work of above-mentioned gas-mist cooling device, the airstream belt steel being sprayed by gas orifice, smashes formation aerosol at the outlet air jet of gas-mist cooling device by the water jet of water outlet ejection from bottom to top.Because gas-liquid angle is 90 °, gas energy is fully used, and makes liquid bundle in best shearing condition, can effectively liquid bundle be broken for to drop group.This gas-mist cooling device is compared with existing pressure atomization type refrigerating unit, simple in structure, easy processing and fabricating, and also the diameter in water hole is large, is not easy fouling and stops up, and has adapted to the requirement of continuous heat treatment unit " zero dimension is protected ".Atomization simultaneously does not need high-pressure air, common blower fan just can be realized atomization, if stop supplying water, can also use as high speed jet nozzle, therefore this gas-mist cooling device has the air-cooled and cold two kinds of functions of mist, can improve significantly speed of cooling and cooling curve regulation range before quenching with molten steel.
The method of cooling of high-strength steel continuous heat treatment of the present invention is by adopting technique scheme, thereby can obtain suitable average rate of cooling cools down the band steel of differing temps equably fast according to the cooling curve of different high-strength steel product thermal treatment process requirements, can be in the situation that add a small amount of alloying element in the substrate of steel plate, produce there is more high strength, performance, 780MPa, 980MPa, 1180MPa, 1280MPa and many kinds of kinds of 1470MPa of better plate shape, the advanced high-strength steel product of multiple intensity rank more uniformly.
In addition, the method of cooling of high-strength steel continuous heat treatment of the present invention is by aerosol cooling step, realized the lifting gradually with steel rate of cooling, its flexible design by each cooling section length and cooling power and use flexibly, can realize the flexible control with steel cooling curve.General traditional shrend technology band steel slow cooling terminal temperature, namely shrend enters water temp all for example, lower than 700 ℃ (680 ℃), if need 12s from soaking temperature slow cooling to a 680 ℃ left and right for 800 ℃ of left and right, the aerosol cooling step that adopts the technical program to adopt can be brought up to 760 ℃ slow cooling terminal temperature (being that shrend enters water temp), corresponding slow cooling time decreased is to 4s, more traditional method of cooling has reduced 2/3rds, that is to say, technical solutions according to the invention only need the time of 1s left and right just the band steel of 760 ℃ of left and right can be cooled to below 600 ℃ by aerosol cooling step, making shrend enter water temp obviously reduces, thereby improve cooling uniformity and belt plate shape, average cooling rate can be brought up to original twice simultaneously, owing to setting up aerosol cooling step, further improved the average cooling rate with steel, it makes the alloying element that adds less amount in the substrate of steel plate also can produce the more advanced high-strength steel product of high intensity levels, can also improve the use properties of high-strength steel product simultaneously, as welding property etc.
In addition, shrend cooling step in the method for cooling of high-strength steel continuous heat treatment of the present invention can realize with steel fast, evenly cooling, guarantee to spray the cooling water droplet splashing and can not touch the band steel before shrend, thereby further guarantee that band steel is evenly cooling fast, produce the intensity advanced high-intensity band steel that more high-performance more evenly, plate shape is better.
Accompanying drawing explanation
Fig. 1 is that publication number is the structural representation of the disclosed technical scheme of United States Patent (USP) of US4330112.
Fig. 2 is the method for cooling schema of high-strength steel continuous heat treatment of the present invention.
Fig. 3 is the structural representation of the gas-mist cooling device that adopted in an embodiment of the step (2) of the method for cooling of high-strength steel continuous heat treatment of the present invention.
Fig. 4 is the lateral plan of the gas-mist cooling device shown in Fig. 3.
Fig. 5 is the apparatus structure schematic diagram that the method for cooling of high-strength steel continuous heat treatment of the present invention adopts.
Embodiment
Below with reference to Figure of description and embodiment, the method for cooling of high-strength steel continuous heat treatment of the present invention is described in further detail.
As shown in Figure 2, according to following step, to band steel, carry out cooling:
(1) carry out slow cooling: the belt steel surface through continuous annealing furnace soaking zone is carried out to jet slow cooling;
(2) carry out aerosol cooling: adopting aerosol spray refrigerating unit as shown in Figure 3 and Figure 4 to spray cooling aqueous vapor mist, that belt steel surface is carried out to further aerosol is cooling, at 40 of Fig. 5;
(3) adopt granulating unit as shown in Figure 5 to carry out shrend cooling:
(3a) adopt a pair of water cutter being arranged on steel two surperficial both sides to spray stratiform water column to belt steel surface, the injection direction of this stratiform water column is acute angle angle with the direct of travel with steel;
(3b) adopt two groups of nozzles that are arranged on steel two surperficial both sides to spray high velocity flow to belt steel surface, this high velocity flow is by the vapor bubbles at belt steel surface and the steam film belt steel surface that blows off, and this high velocity flow is acute angle angle with band steel direct of travel;
(3c) band steel is immersed in water coolant, and adopt two groups to be arranged at water coolant nozzle subsurface and that be located at respectively with steel two surperficial both sides and to spray high velocity flow to belt steel surface, this high velocity flow is by the vapor bubbles at belt steel surface and the steam film belt steel surface that blows off, and this high velocity flow is acute angle angle with band steel direct of travel;
(4) water coolant of belt steel surface is dried.
Table 1 has been listed in the embodiment 1-3 of the technical program the concrete process for cooling of implementing with steel and the corresponding cooling performance for each intensity rank.
Table 1.
In each embodiment of this case, all adopted as Fig. 3, gas-mist cooling device shown in Fig. 4, as can be seen from the figure, gas-mist cooling device have gas orifice 41 and with the vertically disposed water outlet 42 of gas orifice, water outlet 42 supplies water by water pipe 43, the gas direction of gas orifice 41 ejections is vertical with band steel direct of travel, and vertical with the water (flow) direction of water outlet 42 ejections, because gas-liquid angle is 90 °, gas energy is fully used, make liquid bundle in best shearing condition, can effectively liquid bundle be broken for to drop group, thereby gas-liquid two-phase forms described water coolant aerosol near belt steel surface.
In each embodiment of the technical program the device that adopts as shown in Figure 5, band steel 21 move vertically downward, three groups are arranged at that with 33 pairs of the gas-mist cooling devices of steel 21 both sides, to be with steel 21 first to carry out aerosol cooling.Water cutter 22 is an acute angle angle with band steel direct of travel, first to band steel, sprays cold; Then adopt some nozzles 23 that ranked first same and that be the setting of acute angle angle with steel direct of travel to band steel injection high velocity flow, the discharge of nozzle 23 is controlled by the first valve 25; Then use watch-quench tank 27 and be located at that watch-quench tank 27 is interior subsurfacely somely ranked second that 24 pairs of band steel of nozzle carry out while boshing and spray is cold, second nozzle 24 is same has acute angle angle with band steel direct of travel, and the water yield of second nozzle 24 is by the second valve 26 controls.After above-mentioned shrend is cooling, with steel, through two pairs of squeezing rollers 28 along setting gradually with steel direct of travel, limit portion band steel blow device 29 and hot air drier 30, dry.Adjustable for the water yield and the water temperature that realize in watch-quench tank 27, in the present embodiment, be also provided with filling pipe and valve 31 thereof and water shoot and valve 32 thereof.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, have many similar variations thereupon.If all distortion that those skilled in the art directly derives or associates from content disclosed by the invention, all should belong to protection scope of the present invention.
Claims (8)
1. a method of cooling for high-strength steel continuous heat treatment, is characterized in that, comprises the following steps:
(1) belt steel surface through continuous annealing furnace soaking zone is carried out to jet slow cooling;
(2) adopting a gas-mist cooling device to spray cooling aqueous vapor mist, that belt steel surface is carried out to aerosol is cooling;
(3) adopt a cooling water jet unit to spray stratiform water column to belt steel surface, the injection direction of layered water column is acute angle angle with the direct of travel with steel;
(4) adopt one first tuyere arrangement to spray high velocity flow to belt steel surface, the speed of described high velocity flow is set to the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off;
(5) band steel is immersed in water coolant, and adopts one to be arranged at the subsurface second nozzle device of water coolant and to spray high velocity flow to belt steel surface, the speed of described high velocity flow is set to the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off;
(6) water coolant of belt steel surface is dried.
2. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 1, is characterized in that, the injection direction of the high velocity flow in described step (5) is acute angle angle with band steel direct of travel.
3. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 2, is characterized in that, the injection direction of the high velocity flow in described step (4) is vertical with the direct of travel with steel.
4. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 2, is characterized in that, the injection direction of the high velocity flow in described step (4) is acute angle angle with the direct of travel with steel.
5. the method for cooling of the high-strength steel continuous heat treatment as described in any one in claim 1-4, is characterized in that, the temperature of the water coolant adopting in described step (2)-(5) is below 70 °.
6. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 5, is characterized in that, the temperature of the water coolant adopting in described step (2)-(5) is below 50 °.
7. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 6, is characterized in that, the cooling water jet unit adopting in described step (3) is water cutter.
8. the method for cooling of the high-strength steel continuous heat treatment as described in any one in claim 1-4, it is characterized in that, the gas-mist cooling device adopting in described step (2) have gas orifice and with the vertically disposed water outlet of described gas orifice, the gas direction of described gas orifice ejection is vertical with band steel direct of travel, and vertical with the water (flow) direction of water outlet ejection, near belt steel surface, gas-liquid two-phase forms described water coolant aerosol.
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| CN103834792B (en) * | 2014-03-26 | 2015-12-30 | 东北大学 | A kind of steel plate continuous roll type quenching process |
| CN112795771A (en) * | 2020-12-30 | 2021-05-14 | 阳江宏旺实业有限公司 | Mist cooler, stainless steel continuous annealing cooling system and cooling method thereof |
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