CN101285114A - Cooling method of high strength band steel and device - Google Patents
Cooling method of high strength band steel and device Download PDFInfo
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- CN101285114A CN101285114A CNA2007100393941A CN200710039394A CN101285114A CN 101285114 A CN101285114 A CN 101285114A CN A2007100393941 A CNA2007100393941 A CN A2007100393941A CN 200710039394 A CN200710039394 A CN 200710039394A CN 101285114 A CN101285114 A CN 101285114A
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Abstract
The invention discloses a high strength strip steel cooling device, which comprises an inlet roller, an outlet roller, a plurality of perhydrous high speed spouts and a plurality of water-cooling stabling rollers, wherein the perhydrous high speed spouts are orderly arranged at two sides of a running path a strip steel to be cooled between the inlet roller and the outlet roller, the perhydrous high speed spouts jet hydrogen with high concentration and high speed to cool the strip steel; the water-cooling stabling rollers are orderly arranged on the running path of the strip steel to be cooled between the inlet roller and the outlet roller; the strip steel to be cooled orderly drills through one group of water-cooling stabling rollers and are cooled by the water-cooling stabling rollers; the strip steel forms an angle of contact during drilling through the water-cooling stabling rollers; the water-cooling stabling roller are configured in pair, the perhydrous high speed spouts are arranged between each two pairs of water-cooling stabling rollers, and the back of each water-cooling stabling roller is provided with perhydrous high speed spouts with larger flow. The high strength strip steel cooling device belongs to a dry cooling method, has average cooling speed up to 200 DEG C per second (to 1.0 mm of the strip steel), and can uniformly cool the strip steel and also can ensure the good strip shape of the strip steel after being cooled with high speed.
Description
Technical field
The present invention relates to ferrous materials thermal treatment field, more particularly, relate to a kind of " dry type " method for rapid cooling of using with steel continuous annealing or galvanization production line.
Background technology
Along with people to the enhancing of environmental protection consciousness with to improving constantly that traffic safety requires, automobile steel develops to the high strength direction.
And generally speaking, high strength cold-rolled plate and heat zinc coating plate adopt continuous annealing unit and the production of pot galvanize unit respectively, for the band steel is undergone phase transition in heat treatment process to improve its intensity, continuous annealing and pot galvanize unit must possess quick cooling power (shrend, the cooling of high hydrogen high speed jet or roll-type cooling etc.).The typical process flow of high strength cold-rolled plate continuous annealing is:
Uncoiling-cleaning-heating-soaking-slow cooling-quick cooling-timeliness (tempering)-secondary cooling-low temperature shrend-smooth-finishing-high strength cold-rolled plate.
The typical process of high-strength hot-dip zinc-coated plate continuous hot galvanizing is:
Uncoiling-cleaning-heating-soaking-slow cooling-cooling-pot galvanize (or comprising alloying) fast-secondary cooling-low temperature shrend-smooth-finishing-high-strength hot-dip zinc-coated plate.
No matter be continuous annealing or continuous hot galvanizing, its critical process all is quick refrigerating work procedure.
In the production technique of high strength cold-rolled plate and heat zinc coating plate, in order to guarantee welding property with steel, reduce the high-strength steel production cost simultaneously, must reduce the alloying element content in the steel as far as possible, but the hardening capacity when this has reduced phase transformation strengthening high strength band steel annealing cooling, so when the speed of cooling after the soaking is slow, can not obtain the high strength band steel of desirable strength grade.Therefore, in order to obtain to have the high strength cold-rolled plate and the heat zinc coating plate of good welds performance, very fast speed of cooling after must guaranteeing to anneal.So the method for rapid cooling in high strength band steel continuous annealing/hot dip galvanizing process is the technology of most critical in the whole continuous heat treatment technology.
The method for rapid cooling of having developed in continuous annealing/hot dip galvanizing process comprises: roll-type cooling (RQ), high-speed gas injection cooling (HGJC), air-water two-phase quicken that cooling (AcC), hot water cooling (HOWAC), turbulent flow cold water are quenched (TWICE), the compound cooling of roller cold-peace shrend (RQ+WQ), the compound cooling of roller cold-peace gas injection (RQ+GJC), high hydrogen shower cooling (H2-GJC), cold-water quench (WQ) etc.Wherein, adopt " wet type " fast cooling technology relevant with water easily to make the belt steel surface oxidation, subsequent handling need increase pickling process, and this has not only reduced the surface quality of band steel but also has made process complications, therefore, " dry type " fast-cooling technology such as the high hydrogen high-speed gas injection without water-cooled cools off (H
2-GJC) cooling has caused people's attention with roll-type.
Japanese patent application No. spy opens the high hydrogen high speed jet method of cooling (H that flat 6-346156 provides a kind of continuous annealing furnace to use
2-GJC), this method is sprayed by the nozzle chest belt steel surface after the soaking of continuous operation that has the outstanding opening of front end and is contained 70%-90%H
2The shielding gas of concentration comes the cooling zone steel.Because H
2Thermal conductivity be N
27 times, this method with adopt to spray low H
2The jet method of cooling of the shielding gas of concentration is compared, and can improve speed of cooling greatly; And because H
2Density compare N
2Little, therefore less to the impact of band steel during shower cooling under identical efflux velocity condition, the vibration that can alleviate the band steel.The main drawback of this patent is: in order to ensure the stable at a high speed logical plate of band steel, reduce the judder of band steel and do not adopt sufficiently high efflux velocity, this has reduced the speed of cooling of this method, the more important thing is, because the vibration of band steel is inevitable in the jet process for cooling, therefore must be provided with and stablize the galled spots even the broken belt of roller to avoid causing with the steel high vibration, but can not implement the jet cooling of high hydrogen stablizing the roller place, do not adopt other the type of cooling yet, this greatly reduces this patent method of cooling average cooling rate, and the speed of cooling of this method of cooling is lower than 150 ℃/S (to the band steel of 1mm thickness).
Japanese patent application No. spy opens the method for cooling (RQ+GJC) that the employing roll-type is cooled off and the gas shower cooling combines that flat 11-236622 provides a kind of continuous annealing furnace to use; this method of cooling is cooled to the master with roll-type; (shielding gas, composition is generally 95%-98%N to bound gas simultaneously
2) shower cooling band steel, wherein, the roll-type cooling is that the band steel in advancing is contacted with inner holding with water-cooled copper roller, comes quick cooling zone steel by thermal conduction.According to different belt steel thickness, width and belt speed, by taking pilot-gas jet segment strip tension (0.8-2.5Kgf/mm2) greater than other stove section strip steel tension force (0.4-1.5Kgf/mm2) in the annealing furnace, and the tension force (2-5Kgf/mm2) of control roll-type cooling section is greater than the measures such as tension force of gas injection section, it is bad that the method for cooling of this patent can prevent to be with steel plate shapes such as shape wave, warpage to occur to a certain extent, the band steel effect that does not undergo phase transition in the fast cold process is particularly evident, realizes evenly cooling.The main drawback of this patent is: owing to adopt roll-type to be cooled to the master, in order to improve cooling power, have to increase the cornerite of band steel and water cooled rolls, when thermal zone steel contacts with the low temperature water cooled rolls, the band steel is difficult to uniform contact with the whole segmental arc that contacts of water cooled rolls, therefore cause band steel inhomogeneous cooling even, can improve its contact condition though add hightension, but can not solve the problem of its inhomogeneous cooling at all, especially for the production of phase transformation strengthening high-strength steel, to produce volume change when undergoing phase transition in the band steel process of cooling, thereby cause plate shape bad, plate shape is bad has aggravated loose contact again conversely, and this has further aggravated inhomogeneous cooling and has caused plate shape to be worsened, and is the method for cooling that belongs to " dispersing " type based on the cold method of cooling of roller therefore; And the excessive tension force of rapid chilling section will make strip plastic deformation, and thin band steel will produce the wooden dipper song, and this also will make band band steel shape worsen; Though aspect rate of cooling the roll-type method of cooling the local speed of cooling of contact segment very big (maximum can reach 300 ℃/S), then speed of cooling is very little but in the noncontact section, so its average cooling rate not high (80 ℃/S), though the method for cooling of this patent has also been set up jet cooling at the back side that the band steel contacts with water cooled rolls in addition, speed of cooling is increased to some extent, but the band steel between the water cooled rolls is without any cooling, so its average cooling rate is still on the low side, the production that can not fully satisfy the phase transformation strengthening high-strength steel is to quick refrigerative requirement.
Therefore, simple high hydrogen high speed jet method of cooling (H
2-GJC) all there is significant disadvantages with the simple method of cooling (RQ+GJC) that roll-type is cooled off and the gas shower cooling combines.The method of cooling (RQ+GJC) that roll-type cooling and gas shower cooling combine makes it often cause plate shape to be worsened also when the high-strength steel that cooling phase-change is strengthened based on the cold feature of roller so greatly reduces its speed of cooling; High hydrogen high speed jet method of cooling (H
2-GJC) be used to prevent under the high speed jet situation, can not implement the jet cooling of high hydrogen in the stable roller place of judder with steel, do not implement alternate manner cooling yet, this also greatly reduces its average cooling rate.
Summary of the invention
The present invention proposes just for these reasons, and tries hard to advantage in conjunction with roll-type cooling and gas shower cooling, eliminates both shortcomings simultaneously.Be cooled to main characteristics with roll-type in the method for cooling (RQ+GJC) that traditional roll-type is cooled off and the gas shower cooling combines, the present invention is cooled to auxilliary based on high hydrogen high speed jet method of cooling, roll-type, and jet body is high H
2The high hydrogen high-speed gas of concentration, cooling intensity are big.The method of cooling (RQ+GJC) that traditional roll-type cooling and gas shower cooling combine is cold based on roller, just is aided with jet cooling at the back side of water cooled rolls, and jet body is 95～98%N
2The shielding gas of concentration.Production practice show that the average cooling rate of high hydrogen high speed jet cooling raio (RQ+GJC) is big, and more obvious to the high-strength steel of phase transformation strengthening.Than traditional simple high hydrogen high speed jet method of cooling (RQ+GJC), because the present invention is that water-cooled stablize roller with the stable roller in the high hydrogen high speed jet method of cooling, and applies big flow and carry on the back and blow, thereby accelerated speed of cooling greatly.
Technical scheme of the present invention can be implemented as follows:
According to an aspect of the present invention, provide a kind of high-intensity band steel refrigerating unit, comprising: the inlet roller enters described high-intensity band steel refrigerating unit for band steel to be cooled; Outlet roller shifts out described high-intensity band steel refrigerating unit for cooled band steel; Several high hydrogen high speed spouts are arranged in the operating path both sides of band steel to be cooled between inlet roller and the outlet roller successively, and the high-velocity jet high concentration hydrogen is cooled off the band steel; Several water-cooleds are stablized roller, be arranged in successively on the operating path of band steel to be cooled between inlet roller and the outlet roller, described band steel to be cooled passes described one group of water-cooled successively to be stablized roller and stablizes roller by described water-cooled and cool off, and described band steel passes and forms cornerite when described water-cooled is stablized roller; Wherein, described water-cooled is stablized roller and is disposed in pairs, and stablize between the roller in per two pairs of water-cooleds and arrange a plurality of high hydrogen high speed spouts, and, the high hydrogen high speed spout of enlargement discharge is provided at the back side that each water-cooled is stablized roller.
In preferable implementation, the concentration of the hydrogen of described injection is more than or equal to 30%, and jet velocity is more than or equal to 100m/s.More preferably, the concentration of the hydrogen of described injection is 50%-80%, and jet velocity is 150m/s-200m/s.
In preferable implementation, the water-cooled of described paired configuration is stablized two water-cooleds in the roller, and to stablize the Inlet and outlet water direction of roller opposite, forms a cooling water recirculation system; The logarithm that described water-cooled is stablized roller is an even-even.It is the copper hollow structure that described water-cooled is stablized roller, is carved with groove on the inwall.The distance that described per two pairs of water-cooleds are stablized between the roller is determined according to desired band steel vibration amplitude; Described band steel passes and forms cornerite when described water-cooled is stablized roller is more than or equal to 30 °.
High-intensity band steel refrigerating unit of the present invention also comprises gas-tight sealing, is installed in described inlet roller and outlet roller place, makes the gas in the described high-intensity band steel refrigerating unit sealed; Gas-recycling plant makes the interior gas circulation of device to keep predetermined pressure; The center line alignment device is aimed at the midline position of described band steel; And tension control system, the tension force of control band steel.
According to another aspect of the present invention, provide a kind of cooling method of high strength band steel, comprise following step: the high-velocity jet high concentration hydrogen is cooled off the band steel; Several water-cooleds of layout are stablized roller on the operating path of band steel to be cooled between inlet roller and the outlet roller, make described band steel to be cooled pass described one group of water-cooled successively and stablize roller and stablize roller by described water-cooled and cool off, described band steel passes and forms cornerite when described water-cooled is stablized roller; The hydrogen of collecting injection is with recycle; Wherein, dispose described water-cooled in pairs and stablize roller, stablize in per two pairs of water-cooleds and arrange a plurality of high hydrogen high speed spouts between the roller, and the back side enlargement discharge of stablizing roller in each water-cooled sprays high concentration hydrogen.
In preferable implementation, the concentration of the hydrogen of described injection is more than or equal to 30%, and jet velocity is more than or equal to 100m/s.More preferably, the concentration of the hydrogen of described injection is 50%-80%, and jet velocity is 150m/s-200m/s.
In preferable implementation, stablize the Inlet and outlet water direction that provides opposite in the roller in two water-cooleds that the water-cooled of configuration is in pairs stablized in the roller, form a cooling water recirculation system; The water-cooled of configuration even-even is stablized roller.Described water-cooled is stablized roller for being made into the copper hollow structure, and on inwall the ditch groove.Determine that according to desired band steel vibration amplitude described per two pairs of water-cooleds stablize the distance between the roller; Making described band steel pass and forming cornerite when described water-cooled is stablized roller is more than or equal to 30 °.
This method also comprises following step: seal at inlet roller and outlet roller place, make the gas in the described high-intensity band steel refrigerating unit sealed; Make the interior gas circulation of device to keep predetermined pressure; Aim at the midline position of described band steel; And the tension force of control band steel.
Refrigerating unit provided by the invention and method of cooling not water but are cooled to the master with high hydrogen high speed jet as heat-eliminating medium, are aided with the roll-type cooling simultaneously, and evenly and fast cooling and product surface quality are good to guarantee to be with steel.The present invention sprays density of hydrogen more than 30% by belt steel surface after the soaking of high-speed cruising, and optimum concn is at 50-80%H
2The quick cooling zone steel of the shielding gas of concentration; simultaneously at the inner logical recirculated cooling water of the stable roller of high hydrogen high speed jet process for cooling; make the original pure double water cooled rolls of doing of stable roller; the cornerite of stablizing roller and belt steel surface by suitable increase water-cooled improves the speed of cooling that water-cooled is stablized roller cooling zone steel; thereby not only made full use of the fast but also advantage of uniform of high hydrogen high speed jet process for cooling speed of cooling; also combine roll-type cooling zone steel and the fast advantage of water cooled rolls contact segment cooling rate, eliminated being cooled to roll-type that main easily to produce inhomogeneous cooling even; the what is called that plate shape is bad " is dispersed " the cooling problem.Thisly be cooled to the master by adopting with high hydrogen high speed jet, be aided with roll-type refrigerative method for rapid cooling simultaneously, the jet method of cooling of the comparable simple high hydrogen of its fast speed of cooling improves more than 20%, fast speed of cooling can reach 200 ℃/s (to the band steel of 1mm thickness), becomes " dry type " method of cooling of present average cooling rate maximum.Therefore, adopt this speed of cooling faster method of cooling can improve the strength grade of the high-intensity band steel that continuous annealing unit and pot galvanize unit produce greatly.
Description of drawings
Fig. 1 shows the structure according to high-intensity band steel refrigerating unit of the present invention;
Fig. 2 shows the sectional view that water-cooled in the high-intensity band steel refrigerating unit of the present invention is stablized roller;
Fig. 3 shows the specific implementation according to high-intensity band steel refrigerating unit of the present invention.
Embodiment
The invention provides following a kind of high-intensity band steel refrigerating unit 100, show its structure, comprising with reference to figure 1:
Several high hydrogen high speed spouts 106 are arranged in the operating path both sides of band steel 101 to be cooled between inlet roller 102 and the outlet roller 104 successively, and the high-velocity jet high concentration hydrogen is cooled off band steel 101.
Several water-cooleds are stablized roller 108, be arranged in successively on the operating path of band steel 101 to be cooled between inlet roller 102 and the outlet roller 104, band steel 101 to be cooled passes one group of water-cooled successively to be stablized roller 108 and stablizes roller 108 by water-cooled and cool off, and band steel 101 passes water-cooled formation cornerite when stablize roller 108.Water-cooled is stablized roller 108 and is disposed in pairs, and stablize between the roller 108 in per two pairs of water-cooleds and arrange a plurality of high hydrogen high speed spouts 106, and, the high hydrogen high speed spout 110 of enlargement discharge is provided at the back side that each water-cooled is stablized roller 108.
In the embodiment in figure 1, this high-intensity band steel refrigerating unit 100 also comprises:
Gas-tight sealing 114 is installed in inlet roller 102 and outlet roller 104 places, makes the gas in band steel 101 refrigerating units 100 sealed.
Gas-recycling plant 112 makes the interior gas circulation of device to keep predetermined pressure.
Center line alignment device 116 is aimed at the midline position of being with steel.
Above-mentioned high-intensity band steel refrigerating unit 100 is carried out following method the band steel is cooled off:
The high-velocity jet high concentration hydrogen is cooled off the band steel;
Arrange that on the operating path of band steel to be cooled between inlet roller and the outlet roller several water-cooleds stablize roller, make band steel to be cooled pass one group of water-cooled successively and stablize roller and stablize roller by water-cooled and cool off, be with steel to pass water-cooled formation cornerite when stablizing roller; The configuration water-cooled is stablized roller in pairs, stablize in per two pairs of water-cooleds and arrange a plurality of high hydrogen high speed spouts between the roller, and the back side enlargement discharge of stablizing roller in each water-cooled sprays high concentration hydrogen;
Seal at inlet roller and outlet roller place, make the gas in the described high-intensity band steel refrigerating unit sealed;
Make the interior gas circulation of device to keep predetermined pressure;
Aim at the midline position of described band steel; And
The tension force of control band steel.
After the applied quick process for cooling section of high-intensity band steel refrigerating unit provided by the invention and method of cooling is positioned at the retarded cooling process section of continuous annealing/hot galvanizing line, before overaging section or the reheat section, slowly refrigerative band steel enters high hydrogen high speed jet cooling and the cold combination cooling section of roller through pinch roll after soaking, water-cooled is stablized roller 108 can select the higher copper production of thermal conductivity for use, form the inner hollow structure that cavity is arranged, flow through for recirculated water, water-cooled is stablized roller 108 internal surfaces can scribe groove 108a strengthening heat exchange effect, and water-cooled is stablized the sectional view of roller 108 can be with reference to shown in Figure 2.Among the present invention, it is paired configurations that water-cooled is stablized roller 108, distance is determined by band steel Oscillation Amplitude between per two pairs of stable rollers, generally should be contracted in the band steel Oscillation Amplitude small range, so that the increasing substantially of the jet cooling draught speed of high hydrogen, the depth of penetration of every pair of stable roller should be brought up to is enough to make that the band steel forms the cornerite more than 30 °, and preferable angle is 60 °-70 °.Stablize the high hydrogen high speed spout 110 that reverse side that roller 108 contacts is provided with enlargement discharge in band steel and each water-cooled, adopt the big flow back of the body of ultra-high speed to blow spray hydrogen (gas velocity herein and gas flow can be far longer than the high hydrogen high velocity projector of other positions), because can increasing substantially jet refrigerative speed, the support that has water-cooled to stablize roller 108 can not increase by 101 vibrations of band steel on the one hand, also can reduce the band steel in addition on the one hand contacts with the inhomogeneous of water cooled rolls roll surface, improve cooling uniformity, improve plate shape.In order further to improve the cold homogeneity of roller, every pair of Inlet and outlet water direction opposite (symbolization "+" and " " are represented different Inlet and outlet water directions respectively in the accompanying drawings) that water-cooled is stablized roller all forms a cooling water recirculation system thereby make each stablize roller to water-cooled.The logarithm that water-cooled is stablized roller 108 also is designed to even number, per two pairs of water-cooleds are stablized some high hydrogen high speed spouts 106 to symmetric arrangement are set between the roller 108, and gas-tight sealing 114 is set having made up the inlet roller 102 and outlet roller 104 places of high hydrogen high speed jet cooling with roll-type refrigerative high-intensity band steel refrigerating unit 100, make the gas of high hydrogen concentration be sealed in the high-intensity band steel refrigerating unit 100, guarantee stable at high hydrogen section aerochemistry composition, and make the hydrogen consumption minimize.
The main effect of high hydrogen high speed spout 106 is by nitrogen hydrogen (best density of hydrogen is at the 50%-80%) shielding gas of density of hydrogen＞30% is realized fast cooling greater than the speed high-velocity jet of 100m/s (best gas velocity 150-200m/s) to band steel 101 surfaces with flow velocity; come controlled chilling speed by the cornerite size of controlling efflux velocity (pressure) and gaseous hydrogen content and be with steel 101 and water-cooled to stablize roller 108; and by logarithm that changes high hydrogen high speed spout 106 and the logarithm that water-cooled is stablized roller 108; be the length of cooling section, can control its refrigerative terminal temperature.If cooling length is constant certainly, changes rate of cooling and also can change the refrigerative terminal temperature.The cold combination process for cooling of high hydrogen high speed jet cooling and roller utilizes the comprehensive of the high capacity of heat transmission of hydrogen and the efficient cooling power of roll-type, the highest rate of cooling can reach the average rate of cooling of 200 ℃/s (to 1mm band steel), and is more faster than common quick jet cooling, roll-type method of cooling and simple high hydrogen shower cooling method.In combined cooling method of the present invention, high hydrogen high speed jet cooling is main method of cooling, and the roll-type cooling is auxiliary method of cooling, replace simple stable roller owing to adopted water-cooled to stablize roller, this auxiliary roll-type refrigerative employing makes that the stable roller in the simple jet method of cooling takies jet cooling space, the effective shortcoming of cooling off length of shortening is overcome, simultaneously also help shortening the spacing of stablizing between the roller, make the band steel vibration that high speed jet causes reduce, make the operation of band steel stable more and make jet rate of cooling be improved.In addition, because the strong reduction characteristic of high concentration of hydrogen, making is cooled is with the surface of steel slight oxidation in heat-processed fully to be reduced, thereby becomes clean more, so improved strip surface quality, increased substantially the platability of high-strength hot-dip zinc-coated product simultaneously.
The major function that water-cooled is stablized roller 108 and tension control system 118 is: because high hydrogen high speed jet refrigerative efflux velocity is very fast, therefore very easily cause band steel 101 in the stove internal vibration, vibrate and to damage spout and scratch belt steel surface when violent, therefore, the water-cooled effect of stablizing roller 108 is to prevent to be with steel 101 to damage spout because of judder under high hydrogen high speed jet cooling conditions and the surface is scratched on the one hand; On the other hand, water-cooled is stablized and is connected with the round-robin water coolant in the roller 108, by the relative movement that water-cooled is stablized roller 108, can change the contact area that water-cooled is stablized roll surface with the band steel of roller 108, thus the rate of cooling of accommodation zone steel to a certain extent.As seen, the water-cooled among the present invention stablize roller 108 have concurrently the cooling and stabilized zone steel dual-use function.In addition, in order to improve cooling efficiency and to guarantee good band band steel shape, water-cooled is stablized roller 108 and also is equipped with tension control system 118, with the tension force of control band steel.In method of cooling of the present invention, the cooling that water-cooled is stablized roller 108 is auxiliary method of cooling, and adopt to increase to carry on the back and blow, control measures such as rational cornerite, guarantee that thereby the uniform contact of stablizing roller 108 with steel 101 and water-cooled has overcome cooling off based on cold " dispersing " formula of roller in the past, thereby can not cause detrimentally affect the plate shape of band steel after the quick cooling.
The effect of center line alignment device 116 is when water-cooled is stablized roller 108 and come into operation, and guarantees that band steel travel line is between the spout central position to avoid the damage to the high hydrogen high speed of certain side spout 106.
The main effect of gas-tight sealing 114 is to prevent the back segment diffusion leakage forward of the hydrogen of high hydrogen section, gas-tight sealing 114 all is equipped with at the inlet roller place and the outlet roller place of the combination cooling section that high hydrogen high speed jet cooling and roller are cold, like this, the hydrogen of this rapid chilling section can not flow into other stove section, and this also can guarantee hydrogen concentration that high hydrogen section is more stable and lower hydrogen consumption.
Gas-recycling plant 112: for keeping standard atmosphere pressure in the stove, must make the shielding gas circulation, therefore be equipped with gas-recycling plant 112.In order to ensure high hydrogen cooling section safety problem under special circumstances, tape break stop etc. for example, this high-intensity band steel refrigerating unit 100 also must the quick nitrogen charging device (not shown)s of equipment, and motor that should the zone must be an explosion-proof motor.In addition, also comprise devices such as inlet roller 102, outlet roller 104.
The present invention compared with the prior art has conspicuous outstanding feature and advantage:
Method for rapid cooling of the present invention has made up high hydrogen high speed jet process for cooling and roll-type process for cooling, (speed of cooling is fast with high hydrogen high speed jet refrigerative advantage, cooling evenly, it is the cooling of " convergence " type, product surface quality is good) and roll-type refrigerative advantage (band steel fast especially) with roll surface contact site speed of cooling combine, (average rate of cooling and little and inhomogeneous cooling are spared to have avoided simple high hydrogen high speed jet refrigerative shortcoming (thereby stablize roller place do not have cooling reduced average rate of cooling or band steel amplitude big steady running of band steel and the surface quality of influencing) and simple roll-type refrigerative shortcoming simultaneously, be the cooling of " dispersing " type), the speed of cooling of refrigerating unit of the present invention and method of cooling can reach 200 ℃/S (for the band steel of 1.0mm), all faster than simple jet method of cooling of high hydrogen and roll-type cooling, and cooling is very even, can guarantee good plate shape after the band steel is fast cold, therefore, can well satisfy the production of phase transformation strengthening high-strength steel to the quick refrigerative requirement of continuous annealing/pot galvanize unit.
Fig. 3 shows the specific implementation according to high-intensity band steel refrigerating unit 100 of the present invention.The cooling zone of the jet cooling of high hydrogen and roll-type cooling combination comprises that four pairs of water-cooleds stablize roller 208 and three sections high hydrogen high speed jet cooling sections 205, it is one section high hydrogen high speed jet cooling section 205 that per two pairs of water-cooleds are stablized between the roller 208, is furnished with three pairs of high hydrogen high speed spouts 206 on the high hydrogen high speed jet of each section cooling section 205.This method of cooling is cooled to the master with high hydrogen high speed jet, is aided with the roll-type cooling simultaneously.And, at the back side that each water-cooled is stablized roller 208, the high hydrogen high speed spout 210 that provide an enlargement discharge, builds up speed.
Example 1, the cooling zone total length of jet cooling of high hydrogen and roll-type cooling combination is 9m, the belt steel thickness that is cooled is 0.8mm.Thermal zone steel after the soaking slow cooling enters high hydrogen high speed jet cooling of the present invention and roll-type refrigerative combination cooling zone through pinch roll; it is basic identical that band steel and each water-cooled are stablized the cornerite of roller; by control water cooled rolls depth of penetration wrap angle is stabilized in about 60 °; simultaneously; the shielding gas of the speed high-velocity jet density of hydrogen about 75% of high hydrogen nozzle about with flow velocity 140m/s is to the quick cooling zone steel of operating high temperature belt steel surface; be arranged on band steel and water-cooled stablize the big flow of ultra-high speed at roller cornerite position carry on the back blowing gas stream speed can be greater than 150m/s (for example 170m/s); thereby can implement fully cooling to the band steel, also help plate shape simultaneously.Adopt higher tape running speed V=270mpm=4.5m/s in addition, and three sections jet cooling sections of high hydrogen and roller is cold and the back of the body blows whole inputs.
Fast cold section temperature in T1=680 ℃ of present embodiment band steel, band fast cold section temperature out T2=250 ℃ of steel, the band steel is through this cooling section time Δ t=9/4.5=2s, then the average rate of cooling of present embodiment process for cooling is (T1-T2)/(t=(680-250)/2=215 ℃/S is much higher than the cooling of simple jet method of cooling of high hydrogen and roll-type.
Example 2, the belt steel thickness that is cooled are 1.5mm.Thermal zone steel after the soaking slow cooling enters the high hydrogen high speed jet cooling and roll-type refrigerative combination cooling zone of this patent through pinch roll; it is basic identical that band steel and each water-cooled are stablized the cornerite of roller; by control water cooled rolls depth of penetration wrap angle is stabilized in about 70 °; simultaneously; high hydrogen nozzle arrives the quick cooling zone steel of operating high temperature belt steel surface with the shielding gas of the speed high-velocity jet density of hydrogen about 80% of flow velocity 160m/s; being arranged on the big flow back of the body of the ultra-high speed blowing gas stream speed of being with steel and water-cooled to stablize roller cornerite position is 190m/s, has improved the average rate of cooling of band steel greatly.Because the band steel is thicker, therefore adopt lower tape running speed V=180mpm=3m/s, drop into preceding two sections jet cooling sections of high hydrogen this moment and roller is cold and the back of the body blows, and the 3rd section jet cooling section of high hydrogen and the back of the body blow and do not drop into, then cooling section length overall 6m.
Fast cold section temperature in T1=680 ℃ of present embodiment band steel, band fast cold section temperature out T2=290 ℃ of steel, (t=6/3=2s, then the average rate of cooling of present embodiment process for cooling is (T1-T2)/(t=(680-290)/2=195 ℃/S to the band steel through this cooling section time.
Example 3, the belt steel thickness that is cooled are 1.2mm.Thermal zone steel after the soaking slow cooling enters the high hydrogen high speed jet cooling and roll-type refrigerative combination cooling zone of this patent through pinch roll; it is basic identical that band steel and each water-cooled are stablized the cornerite of roller; by control water cooled rolls depth of penetration wrap angle is stabilized in about 65 °; simultaneously; high hydrogen nozzle arrives the quick cooling zone steel of operating high temperature belt steel surface with the shielding gas of the speed high-velocity jet density of hydrogen about 75% of flow velocity 150m/s, and being arranged on the big flow back of the body of the ultra-high speed blowing gas stream speed of being with steel and water-cooled to stablize roller cornerite position is 180m/s.Adopt medium tape running speed V=240mpm=4m/s this moment, this moment three sections jet cooling sections of high hydrogen and roller is cold and the back of the body blows whole inputs, cooling section length overall 9m.
Fast cold section temperature in T1=690 ℃ of present embodiment band steel, band fast cold section temperature out T2=240 ℃ of steel, (t=9/4=2.25s, then the average rate of cooling of present embodiment process for cooling is (T1-T2)/(t=(690-240)/2.25=200 ℃/S to the band steel through this cooling section time.
Can see by above example, in method of cooling of the present invention, can pass through the density of hydrogen of control efflux velocity (pressure), heat-eliminating medium and be with steel and water-cooled to stablize the cornerite size controlled chilling speed of roller, and stablize roller logarithm and rate of cooling etc. by change dropping into high hydrogen nozzle logarithm and water-cooled, terminal temperature that can well controlled chilling.
Because this method of cooling belongs to dry type method of cooling and average cooling rate up to 200 ℃/S (for the band steel of 1.0mm), cooling is very even simultaneously, can guarantee good fast cold back band band steel shape, therefore, can well satisfy the production of phase transformation strengthening high-strength steel to the quick refrigerative requirement of continuous annealing/pot galvanize unit.
Refrigerating unit provided by the invention and method of cooling not water but are cooled to the master with high hydrogen high speed jet as heat-eliminating medium, are aided with the roll-type cooling simultaneously, and evenly and fast cooling and product surface quality are good to guarantee to be with steel.The present invention sprays density of hydrogen more than 30% by belt steel surface after the soaking of high-speed cruising; optimum concn is at the quick cooling zone steel of the shielding gas of 50-80%H2 concentration; simultaneously at the inner logical recirculated cooling water of the stable roller of high hydrogen high speed jet process for cooling; make the original pure double water cooled rolls of doing of stable roller; the cornerite of stablizing roller and belt steel surface by suitable increase water-cooled improves the speed of cooling that water-cooled is stablized roller cooling zone steel; thereby not only made full use of the fast but also advantage of uniform of high hydrogen high speed jet process for cooling speed of cooling; also combine roll-type cooling zone steel and the fast advantage of water cooled rolls contact segment cooling rate, eliminated being cooled to roll-type that main easily to produce inhomogeneous cooling even; the what is called that plate shape is bad " is dispersed " the cooling problem.Thisly be cooled to the master by adopting with high hydrogen high speed jet, be aided with roll-type refrigerative method for rapid cooling simultaneously, the jet method of cooling of the comparable simple high hydrogen of its fast speed of cooling improves more than 20%, fast speed of cooling can reach 200 ℃/s (to the band steel of 1mm thickness), becomes " dry type " method of cooling of present average cooling rate maximum.Therefore, adopt this speed of cooling faster method of cooling can improve the strength grade of the high-intensity band steel that continuous annealing unit and pot galvanize unit produce greatly.
Claims (14)
1. a high-intensity band steel refrigerating unit is characterized in that, comprising:
The inlet roller enters described high-intensity band steel refrigerating unit for band steel to be cooled;
Outlet roller shifts out described high-intensity band steel refrigerating unit for cooled band steel;
Several high hydrogen high speed spouts are arranged in the operating path both sides of band steel to be cooled between inlet roller and the outlet roller successively, and the high-velocity jet high concentration hydrogen is cooled off the band steel;
Several water-cooleds are stablized roller, be arranged in successively on the operating path of band steel to be cooled between inlet roller and the outlet roller, described band steel to be cooled passes described one group of water-cooled successively to be stablized roller and stablizes roller by described water-cooled and cool off, and described band steel passes and forms cornerite when described water-cooled is stablized roller;
Wherein, described water-cooled is stablized roller and is disposed in pairs, and stablize between the roller in per two pairs of water-cooleds and arrange a plurality of high hydrogen high speed spouts, and, the high hydrogen high speed spout of enlargement discharge is provided at the back side that each water-cooled is stablized roller.
2. high-intensity band steel refrigerating unit as claimed in claim 1 is characterized in that,
The concentration of the hydrogen of described injection is more than or equal to 30%, and jet velocity is more than or equal to 100m/s.
3. high-intensity band steel refrigerating unit as claimed in claim 2 is characterized in that,
The concentration of the hydrogen of described injection is 50%-80%, and jet velocity is 150m/s-200m/s.
4. high-intensity band steel refrigerating unit as claimed in claim 1 is characterized in that,
The water-cooled of described paired configuration is stablized two water-cooleds in the roller, and to stablize the Inlet and outlet water direction of roller opposite, forms a cooling water recirculation system;
The logarithm that described water-cooled is stablized roller is an even-even.
5. high-intensity band steel refrigerating unit as claimed in claim 4 is characterized in that,
It is the copper hollow structure that described water-cooled is stablized roller, is carved with groove on the inwall.
6. high-intensity band steel refrigerating unit as claimed in claim 5 is characterized in that,
The distance that described per two pairs of water-cooleds are stablized between the roller is determined according to desired band steel vibration amplitude;
Described band steel passes and forms cornerite when described water-cooled is stablized roller is more than or equal to 30 °.
7. high-intensity band steel refrigerating unit as claimed in claim 1 is characterized in that, also comprises
Gas-tight sealing is installed in described inlet roller and outlet roller place, makes the gas in the described high-intensity band steel refrigerating unit sealed;
Gas-recycling plant makes the interior gas circulation of device to keep predetermined pressure;
The center line alignment device is aimed at the midline position of described band steel; And
Tension control system, the tension force of control band steel.
8. a cooling method of high strength band steel is characterized in that,
The high-velocity jet high concentration hydrogen is cooled off the band steel;
Several water-cooleds of layout are stablized roller on the operating path of band steel to be cooled between inlet roller and the outlet roller, make described band steel to be cooled pass described one group of water-cooled successively and stablize roller and stablize roller by described water-cooled and cool off, described band steel passes and forms cornerite when described water-cooled is stablized roller;
Wherein, dispose described water-cooled in pairs and stablize roller, stablize in per two pairs of water-cooleds and arrange a plurality of high hydrogen high speed spouts between the roller, and the back side enlargement discharge of stablizing roller in each water-cooled sprays high concentration hydrogen.
9. cooling method of high strength band steel as claimed in claim 8 is characterized in that,
The concentration of the hydrogen of described injection is more than or equal to 30%, and jet velocity is more than or equal to 100m/s.
10. cooling method of high strength band steel as claimed in claim 9 is characterized in that,
The concentration of the hydrogen of described injection is 50%-80%, and jet velocity is 150m/s-200m/s.
11. cooling method of high strength band steel as claimed in claim 8 is characterized in that,
Stablize the Inlet and outlet water direction that provides opposite in the roller in two water-cooleds that the water-cooled of configuration is in pairs stablized in the roller, form a cooling water recirculation system;
The water-cooled of configuration even-even is stablized roller.
12. cooling method of high strength band steel as claimed in claim 11 is characterized in that,
Described water-cooled is stablized roller for being made into the copper hollow structure, and on inwall the ditch groove.
13. cooling method of high strength band steel as claimed in claim 12 is characterized in that,
Determine that according to desired band steel vibration amplitude described per two pairs of water-cooleds stablize the distance between the roller;
Making described band steel pass and forming cornerite when described water-cooled is stablized roller is more than or equal to 30 °.
14. cooling method of high strength band steel as claimed in claim 8 is characterized in that, also comprises
Seal at inlet roller and outlet roller place, make the gas in the described high-intensity band steel refrigerating unit sealed;
Make the interior gas circulation of device to keep predetermined pressure;
Aim at the midline position of described band steel; And
The tension force of control band steel.
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