CN104550275A - Method and device for spray evaporation cooling of hot-rolled high-strength rebar - Google Patents

Method and device for spray evaporation cooling of hot-rolled high-strength rebar Download PDF

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CN104550275A
CN104550275A CN201410835811.3A CN201410835811A CN104550275A CN 104550275 A CN104550275 A CN 104550275A CN 201410835811 A CN201410835811 A CN 201410835811A CN 104550275 A CN104550275 A CN 104550275A
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cooling
water
hot
air
spray vaporization
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CN104550275B (en
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李光瀛
张江玲
肖金福
王卫卫
白宇
陈峨
侯中晓
米谷明
赵舸
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Central Iron and Steel Research Institute
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Abstract

The invention discloses a method and a device for spray evaporation cooling of a hot-rolled high-strength rebar, and belongs to the technical field of steel rolling. The device comprises a water and air supply system, six segments of a spray evaporation cooling device, infrared thermometers and a computer operating system, wherein the water and air supply system is composed of a main water pipe, a filter screen, a main air pipe, an air storage tank, a valve bracket system, a water supply pipe and an air supply pipe. Pressure gauges and flow gauges of the valve bracket system transmit pressure parameters and flow parameters of water and air supply to the computer operating system through long-distance instrument signals. According to the device for spray evaporation cooling of the hot-rolled high-strength rebar, grain refinement and bainite transformation are controlled through a grouped and segmented stepped accelerated cooling mode of spray evaporation cooling nozzles, so that strength of the hot-rolled rebar is improved remarkably and required elongation, yield strength ratio and anti-seismic property are acquired on the premise of avoiding martensite ring formation caused by conventional through water cooling, alloy content and new water consumption are reduced, and red rust on the surface of the rebar due to through water cooling is prevented.

Description

A kind of spray vaporization cooling device for hot-rolled high-strength reinforcing bar and method
Technical field
The invention belongs to technical field of steel rolling, particularly relate to a kind of spray vaporization cooling device for hot-rolled high-strength reinforcing bar and method [A Method and Device of Spray Evaporative Cooling (SEC) for Hot-RolledHigh-Strength Rebar].
Background technology
Current countries in the world generally adopt Water cooling method to roll rear controlled cooling model to hot-rolled reinforced bar, to improve the intensity of reinforcing bar.Belgium Institute of Metallurgical Technology CRM is after developing Tempcore Water cooling technology the seventies [1,2]europe and British commonwealth of nations mostly adopt this Water cooling method, the waste heat of steel core (Core) is utilized to carry out tempering (Tempering) to top layer quenched martensite, tempered martensite ring is obtained on the top layer of steel area, and heart portion obtains ferrite-pearlite-bainite, this complex tissue significantly improves the integral yield intensity of reinforcing bar under full-scale stretching condition and tensile strength level, for the production of yield strength YS415,460 and 500MPa level hot-rolled high-strength reinforcing bar.
Within 1994, Guangzhou steel mill is while introduction China Article 1 hot continuous rolling bar unit equipment, the a complete set of Tempcore Water cooling patented technology introducing Belgian CRM, after nearly 1 year field adjustable from May, 1996 drop into batch production use, according to British Standard BS4449-88 produce YS415,460 and 500MPa level outlet reinforcing bar [3].After this, domestic many producers adopt similar Water cooling method to produce hot-rolled high-strength reinforcing bar, HRB335, HRB400 and HRB500 level reinforcing bar product of such as standard GB/T 1499.2.
But, due to China's building trade to the method for attachment that reinforcing bar adopts be welding, instead of picture Europe adopts socket to be connected with bolt with British commonwealth of nations, the hot-rolled reinforced bar of this Water cooling cannot ensure welding performance, martensite ring easily causes weld crack, and after Thermal Cycle, martensite ring disappears, and significantly reduces the intensity at building structure welding point position, danger is caused to the safe handling of building, especially to the anti-seismic performance of earthquake prone areas building, there is very large threat.Meanwhile, this Water cooling method, very easily causes the red Fe of hot-rolled reinforced bar Surface Creation 2o 3rusty scale, has had a strong impact on the Acceptable life of Water cooling reinforcing bar and xoncrete structure.
Two decades years comes, the red rusty scale problem of the top layer martensite ring caused due to Water cooling technique and surface is not resolved always, become the important technical obstacle of puzzlement China hot-rolled high-strength reinforcing bar performance quality, in the urgent need to the novel cooling technology that a kind of applicable hot-rolled high-strength reinforcing bar is evenly strengthened, can cooling velocity avoided too fast with under the prerequisite of quenched martensite ring appearance, the yield strength of effective raising As rolled reinforcing bar, and percentage elongation, strong flexor ratio and the anti-seismic performance needed for obtaining, prevent the formation of rebar surface red rust simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of spray vaporization cooling device for hot-rolled high-strength reinforcing bar and method, solve the problem of the above-mentioned red rusty scale of top layer martensite ring and surface caused due to Water cooling technique.
Spray vaporization process for cooling device of the present invention comprises water and air supply system, spray vaporization cooling device six sections, infrared radiation thermometer and computer operating system, sees accompanying drawing 1.Wherein, air feed water system is made up of water-main, screen pack, gas main, air accumulator, vavle shelf system (instrument valve), feed pipe and air supply pipe.Each Pressure gauge of vavle shelf system and flowmeter will to supply water and the pressure of air feed and flow parameter send computer operating system to by far distance instrument signal respectively.
Spray vaporization cooling device of the present invention is made up of six cooling sections, comprises 15 cooling units, see accompanying drawing 2 in every section.In each cooling unit, four spray vaporization cooling jets 8 are installed, these four nozzle layouts facing each other at grade, between adjacent nozzle mutually at an angle of 90, each jet expansion aims at the longitudinal centre line of the hot-rolled reinforced bar run along each section of cooling device center line.
Spray vaporization cooling jet of the present invention, is made up of water inlet, air inlet, diversion cavity, mixed aerosol chamber, nut and waterfog head, sees accompanying drawing 3.The water inlet 1 on spray vaporization cooling jet top is connected with diversion cavity 3 respectively with air inlet 4.Diversion cavity 3 is connected with the mixed aerosol chamber 2 of spray vaporization cooling jet bottom, makes the gentle mixed aerosol under a certain pressure of water.Nut 5, for connecting mixed aerosol chamber 2 and waterfog head 6, makes the water smoke formed in mixed aerosol chamber 2 penetrate from shower nozzle 6.
Each spray vaporization cooling jet of the present invention respectively by water inlet and air inlet metal hose with to supply water in each section and gas manifold is connected, water supply in each cooling section is connected with feed pipe and air supply pipe with air-supplying valve (G1) ~ (G6) respectively by water supply valve (W1) ~ (W6) with gas manifold, sees accompanying drawing 1.
Three infrared radiation thermometers that apparatus of the present invention adopt, comprise the temperature measurer T in finish to gauge frame exit 1, six sections of spray vaporization cooling device exits temperature measurer T 2, cold bed porch temperature measurer T 3, see accompanying drawing 1, respectively by the finishing temperature T of hot-rolled reinforced bar 1, hot-rolled reinforced bar is through the final cooling temperature T after spray vaporization cooling device 2, hot-rolled reinforced bar returns Wen Wendu T when entering cold bed 3, carry out continuous on-line testing and be sent to computer operating system.
The computer operating system of apparatus of the present invention, comprises programmable controller PLC, far distance instrument Signal reception program, display and control inerface program, on-line monitoring operating system, technological parameter and mechanical performance data storehouse etc.This computer operating system is by receiving system and display interface, receive and show the far distance instrument signal sent from the instrument and meter of vavle shelf system, the pressure of monitoring water supply and air feed and flow parameter, and by on-line monitoring operation sequence to vavle shelf system and each section of valve (W1 ~ W6, G1 ~ G6) send regulating command, control the cooling velocity of spray vaporization cooling parameter and hot-rolled reinforced bar, see accompanying drawing 1.
Spray vaporization cooling jet of the present invention, to supply water and Supplying gas condition reaches within the scope of required hydraulic pressure, the water yield, air pressure, tolerance, can produce and obtain required droplet size distribution, make the water droplet of this particle size range (1050 ~ 900 DEG C) be instantaneous in the high-temperature final rolling humidity province of hot-rolled reinforced bar to vaporize, and take away a large amount of vaporization latent heats of phase change, make hot-rolled reinforced bar obtain the cooling of high efficiency spray vaporization.
Spray vaporization cooling jet of the present invention, reaches the hydraulic pressure needed for high efficiency cooling, the water yield, air pressure, tolerance parameter area, is to formulate according to the every test carried out on spray vaporization cooling laboratory installation and test data.
The structural representation of apparatus of the present invention is provided by accompanying drawing 4, and its overall structure is made up of spray vaporization cooling section (six), air supply system, water system, spray vaporization nozzle, infrared radiation thermometer and computer operating system.Wherein, spray vaporization cooling device comprises: six cooling sections 40 connected successively, and each cooling section has been installed 15 cooling units 41, each cooling unit is configured with four spray vaporization nozzles 8.The water and air supply system of package unit is connected with in turn: the monitor control system of water-main 42, gas main 43, air accumulator 44, filter 45, vavle shelf system 46, water supply arm 47, gas manifold 48, penstock 49, air valve 50, circumferential weld sparge pipe 51, package unit comprises temperature measurer 52 ~ 54, computer 55, Programmable Logic Controller (PLC) 56.
Apparatus of the present invention are in the porch of each cooling unit 41 of each cooling section 40, installation is provided with primary atomization cooling circumferential weld sparge pipe 51, make that there is the stratiform current of certain speed and pressure and the airflow layer mixed aerosol around high-speed cruising reinforcing bar, form primary atomization cooling zone, to make up (V at a high speed r=7.0 ~ 12.5m/s) the high velocity air layer that produces of the reinforcing bar that runs is to the secondary-atomizing of water smoke and elegant dissipation effect.
The computer 55 on-line monitoring operating system of apparatus of the present invention, adopt " control of hot-rolled high-strength reinforcing bar spray vaporization process for cooling " software program that Programmable Logic Controller (PLC) 56 is write, by display and control inerface, regulation and control is carried out to every technical parameter that spray vaporization cools full technical process.
Apparatus of the present invention also comprise: vapour collect cover, dry pipe and air exhauster that the water vapour that the cooling of each cooling section extraction spray vaporization produces is used, to get rid of the steam that each spray vaporization cooling section produces, improve heat exchange and cooling effectiveness.
The present invention relates to the method for a kind of spray vaporization for hot-rolled high-strength reinforcing bar unit cooling.First feature of the method is, different from the method that the Water cooling continued to use for many years both at home and abroad and superficial layer quench, but adopt the multisection type grouping spray vaporization cooling means of apparatus of the present invention, stepped accelerating cooling is carried out to hot-rolled reinforced bar, make reinforcing bar in the process by each section of cooling device, the minimum temperature on its surface is not less than martensite point M stemperature, make surface of reinforced bar do not occur quenching and martensitic traoformation, but from high temperature austenitic tagma piecemeal accelerating cooling to Bainite Region and ferrite area.Therefore, this new method not only avoid the top layer quenching and martensite ring that traditional Water cooling method produces, and avoid caused by surface martensite phase transformation lattice shear, high dislocation density, being formed of volumetric expansion and surface strain layer, thus avoid the rebar surface caused thus after Water cooling, return strain induced martensite oxidation in warm process, stress corrosion and surperficial Fe 2o 3the generation of red rust.
Spray vaporization cooling means of the present invention, its second feature is, different from the quench mode of the large discharge circulating water adopted of traditional Water cooling and top layer, this method makes full use of the general principle of phase transformation latent heat of vaporization λ=540cal/g far above specific heat of water Cp=1cal/g DEG C of water, its cooling mechanism is no longer nuclear boiling and the film boiling of traditional water-cooled, but spray vaporization cooling; By controlling droplet size distribution, improving Vaporizing cooling ratio and heat exchange efficiency, making hot-rolled reinforced bar obtain packet segmentation staged accelerating cooling, controlling each section of final cooling temperature at the above T of martensite point temperature simultaneously c.T>M sthe utilization rate of cooling medium water is significantly improved on the one hand than traditional Water cooling method, decrease internal circulating load and the consumption of water, cooling velocity and the phase-change organization of hot-rolled reinforced bar is effectively controlled on the other hand than traditional Water cooling method, changed the intensity improving reinforcing bar by crystal grain thinning, bainite and sorbite, obtain the good percentage elongation, strong flexor ratio, anti-seismic performance and the solderability that adapt with high strength.
Spray vaporization cooling means of the present invention, its the 3rd feature is, while the above-mentioned packet segmentation staged acceleration cooling method of employing, not only in basic skills and coolant mechanism, the hot-rolled reinforced bar cooling means of quenching from traditional Water cooling and top layer is completely different, and in the adjustment for the droplet size scope needed for spray vaporization cooling, according to the high-speed cruising feature of hot-rolled reinforced bar, adopt two kinds of regulate and control methods adapting to field condition: the pressure and the flow that change water supply and air feed on the one hand, it not the technological parameter setting on-the-spot unit completely according to the test data of laboratory installation, but consider that high velocity air layer around high-speed cruising reinforcing bar is to the secondary-atomizing effect of water fog particle, and on the impact of actual ejection to the droplet size of rebar surface, have adjusted this device to supply water at the scene the technological parameter of air feed, on the other hand, be provided with primary atomization circumferential weld sparge pipe at each cooling unit, make full use of the atomizing of high velocity air layer, improve cooling effectiveness, and significantly reduce compressed-air actuated use amount.
Because the present invention has three features of above-mentioned spray vaporization cooling means, make this device while making full use of and improving spray vaporization cooling effectiveness, packet segmentation ground controlled cooling model is carried out to hot-rolled reinforced bar, regulates and controls each section of cooling velocity and minimum chilling temperature at the above T of martensite point temperature c.T>M s, avoid surface of reinforced bar quenched martensite ring and the red Fe in surface that traditional Water cooling method causes 2o 3the formation of rusty scale, ensure that the high strength of reinforcing bar, good percentage elongation, strong flexor ratio, anti-seismic performance, solderability and every serviceability, and reduces alloy content and new water consumption.
The main operational steps of the inventive method is:
First, the pressure versus flow of vavle shelf system water supply and air feed is adjusted to the parameter area of technological requirement, check that whether the Pressure gauge supplied water with air supply system is accurately consistent with computer operation interface display reading with meter readings simultaneously, and after the stable aqueous vapor pressure/flow technological parameter reaching setting requires, start to carry out online spray vaporization cooling to hot-rolled reinforced bar.
Secondly, from the hot-rolled reinforced bar that mm finishing mill unit finish to gauge frame continuous high speed shuts out, with V rthe speed of service of=7.0 ~ 12.5m/s enter successively and by the first paragraph of this spray vaporization cooling device to the 6th section, its surface temperature is from finishing temperature T 1(1000 DEG C ± 50 DEG C) are stepwise reduced to the final cooling temperature T after through spray vaporization cooling device 2, and return temperature when entering cold bed to T 3.By setting and regulate the pressure/flow parameter of aqueous vapor, control the water droplet particle size distribution being ejected into rebar surface, make water smoke instant vaporization and take away a large amount of latent heat of vaporization, making hot-rolled reinforced bar reach final cooling temperature T in one second to three seconds 2the target of less than <600 DEG C.
3rd, according to the difference of hot-rolled reinforced bar specification (diameter), adopt different hydraulic pressure/air pressure and the water yield/tolerance proportioning.Wherein: hydraulic pressure regulates in 0.2MPa to 1.2MPa scope, air pressure regulates in 0.0MPa to 0.8MPa scope, the water yield is at 20m 3/ h to 200m 3within the scope of/h, adjustment, tolerance are at 0 to 3600m 3regulate within the scope of/h, the surface being ejected into reinforcing bar from jet expansion after obtaining the water fog particle of different grain size diameter cools;
4th, the reinforcing bar that high temperature and high speed runs passes first cooling unit of first group, the water smoke that four nozzles be arranged symmetrically with in this unit eject different grain size and diameter makes reinforcing bar being cooled by surface during this region, then enter in the bellmouth of fixed nozzle and carry out returning temperature, return the reinforcing bar after temperature to cool through second unit successively, what then enter second unit returns in warm bellmouth, again and again return warm bellmouth through 15 cooling unit coolings and 15 successively, so far the cooling procedure of the 0.3s to 0.6s in first group of spray vaporization cooling device is completed,
5th, the reinforcing bar that high temperature and high speed runs is after have passed through first group of spray vaporization cooling device, be about the cover pipe connection of 1000mm through one, carry out being less than in this jockey 0.14s return temperature after enter into second group of water smoke gasification refrigerating mechanism, repeat the process of the 4th step;
6th, repeat the 4th step and the 5th step successively until proceed to after the 6th group of water mist vaporizing device cool, the hot-rolled reinforced bar of high-speed cruising, by the staged acceleration cooling method of this packet segmentation, makes surface temperature within 1s ~ 3s time, from finishing temperature T 1=1000 DEG C ± 50 DEG C are cooled to final cooling temperature T 2less than <600 DEG C.
7th, by computer operation interface monitoring finishing temperature T 1, final cooling temperature T 2, cold bed return temperature temperature T 3, suitably regulate the water supply of each cooling section and the pressure of air feed and flow, at each key point temperature T 1, T 2, T 3after stable, control each section of aqueous vapor pressure stability of flow at required parameter level.
Finally, technological parameter in computer operating system and mechanical performance data storehouse, according to item materials and process parameters such as the reinforcing bar chemical composition collected, specification (diameter), rolling mill practice and chilling temperatures, the tissue of prediction steel and As rolled mechanical property, if the tissue of steel is different from technical requirement with final mechanical property, the control valve of water supply and air supply system is fed back to by computer, regulate the technological parameters such as the pressure/flow of aqueous vapor, make the performance of hot-rolled reinforced bar reach technical requirement.
The main operating function feature of apparatus of the present invention is, hydraulic pressure, the water yield, air pressure, the tolerance of feed pipe and air supply pipe is regulated by vavle shelf system (instrument valve), regulated aqueous vapor pressure and the flow of each cooling section by each section of water supply valve (W1) ~ (W6) and air-supplying valve (G1) ~ (G6), control droplet size distribution and the spray vaporization cooling effectiveness of each section of inner nozzle injection.
Accompanying drawing explanation
Fig. 1 is the technology arrangement schematic diagram of the spray vaporization cooling device for hot-rolled high-strength reinforcing bar unit of the present invention.
Fig. 2 is the structural representation of wherein any a section of the spray vaporization cooling device for hot-rolled high-strength reinforcing bar unit of the present invention.
Fig. 3 is the schematic diagram of the spray vaporization cooling jet for hot-rolled high-strength reinforcing bar of the present invention.Wherein, water inlet 1, mixed aerosol chamber 2, diversion cavity 3, air inlet 4, nut 5, waterfog head 6.
Fig. 4 is the spray vaporization cooling device structural representation for hot-rolled high-strength reinforcing bar of the present invention.This device is made up of spray vaporization cooling section (six), air supply system, water system, spray vaporization nozzle, infrared radiation thermometer and computer operating system.Wherein, what spray vaporization cooling device connected successively has: six cooling sections 40, each cooling section has been installed 15 cooling units 41, and each cooling unit is configured with four spray vaporization nozzles 8.The water and air supply system of package unit is connected with in turn: the monitor control system of water-main 42, gas main 43, air accumulator 44, filter 45, vavle shelf system 46, water supply arm 47, gas manifold 48, penstock 49, air valve 50, circumferential weld sparge pipe 51, package unit comprises temperature measurer 52 ~ 54, computer 55, Programmable Logic Controller (PLC) 56.
Fig. 5 is the metallographic structure adopting spray vaporization cooling means of the present invention and device to carry out the φ 25mm hot-rolled high-strength HRB 400E antidetonation level reinforcing bar of controlled cooling model.
Detailed description of the invention
Fig. 1 to Fig. 5 is a kind of detailed description of the invention of the present invention, illustrates as follows with regard to its general principle, technical characteristic, actual motion and control method.
As shown in Figure 1, the spray vaporization cooling device technology arrangement schematic diagram of hot-rolled high-strength reinforcing bar unit of the present invention, mainly comprises: a set of water supply steam supply valve frame system be made up of water-main, screen pack, gas main, air accumulator, vavle shelf (valve, Pressure gauge, flowmeter), feed pipe, air supply pipe etc.; A set of six sections of 90 unit configure by spray vaporization cooling jet the spray vaporization cooling device formed, and wherein as shown in Figure 2, any one nozzle arrangements as shown in Figure 3 for any segment structure; A set of computer on-line monitoring operating system be made up of infrared radiation thermometer, remote signal instrument, programmable controller PLC, display and control inerface program, technological parameter and mechanical performance data storehouse.
As shown in the vavle shelf system of Fig. 1 and computer operating system, first the water supply of vavle shelf system and supply gas pressure and flow set are limit in adjustable range, check that whether the Pressure gauge supplied water with air feed is accurately consistent with computer operation interface display reading with flowmeter dial reading simultaneously, and after the stable aqueous vapor pressure/flow technological parameter reaching setting requires, start to carry out online spray vaporization cooling to hot-rolled reinforced bar.
As finish to gauge frame, the temperature measurer T of Fig. 1 1, temperature measurer T 2, temperature measurer T 3shown in the 1st section to the 6th section spray vaporization cooling line, from the hot-rolled reinforced bar that finish to gauge frame continuous high speed shuts out, with V rthe speed of service of=7.0 ~ 12.5m/s enter successively and by the first paragraph of this spray vaporization cooling device to the 6th section, its surface temperature is from finishing temperature T 1(1000 DEG C ± 50 DEG C) stepwise reduce, until through the final cooling temperature T after spray vaporization cooling device 2, then return temperature to T through transfer roller and flying shear entering cold bed 3.By computer monitoring and operating system, hydraulic pressure, the water yield, air pressure, the tolerance parameter of setting and the suitably each cooling section of adjustment, regulation and control is ejected into the water droplet particle size distribution of rebar surface, cooling effectiveness and hot-rolled reinforced bar cooling velocity, make water smoke instant vaporization and take away a large amount of latent heat of vaporization, making hot-rolled reinforced bar reach final cooling temperature T in one second to three seconds 2the target of less than <600 DEG C.
As wherein shown in a segment structure schematic diagram of spray vaporization cooling device of the hot-rolled high-strength reinforcing bar unit of Fig. 2, it is characterized in that, 15 cooling units that each section is made up of 15 groups of nozzles are formed, and hot-rolled reinforced bar is (T within the scope of higher finishing temperature 1=1000 DEG C ± 50 DEG C) enter the first cooling section, when the reinforcing bar of high-speed cruising is through first cooling unit, the water smoke that four nozzles be arranged symmetrically with in this unit eject makes reinforcing bar being able to accelerating cooling by surface during this region, then enter in the bellmouth of fixed nozzle and return temperature in short-term, cool through second unit subsequently, and enter in the bellmouth of second unit and return temperature, successively repeatedly through 15 cooling units cooling and of short durationly return temperature, complete the cooling procedure of the 0.3s to 0.6s in first paragraph spray vaporization cooling device; Subsequently by identical the second cooling section of structure to the 6th cooling section, carry out the staged accelerating cooling divided into groups stage by stage, control each section of minimum chilling temperature and final cooling temperature is not less than martensite transformation temperature T 2>M s; At each key point temperature T 1, T 2, T 3after stable, control each section of aqueous vapor pressure stability of flow at required process for cooling parameter level.
As the spray vaporization cooling device structural representation for hot-rolled high-strength reinforcing bar of Fig. 4, its main operating function feature is, hydraulic pressure, the water yield, air pressure, the tolerance of feed pipe and air supply pipe is regulated by the instrument valve (46) of computer operating system (55) and vavle shelf system, the first to the 6th water supply valve (49) installed by each section and the first to the 6th air-supplying valve (50), regulate aqueous vapor pressure and the flow of each cooling section, control the cooling velocity of the droplet size distribution of each section of inner nozzle injection, spray vaporization cooling effectiveness and hot-rolled reinforced bar.
Adopt hot-rolled high-strength reinforcing bar spray vaporization cooling means as shown in Figure 1, Figure 2, Figure 3 and Figure 4 of the present invention and device, replace traditional Water cooling and top layer quenching technical, make the yield strength of ideal format φ 22 ~ 25mm hot rolling HRB400 level reinforcing bar be stabilized within the scope of YS=440 ~ 460MPa, meet all technical requirement of GB1499.2-2007.After ten days natrual ageing, mechanical properties test result shows, its yield strength is YS=429 ~ 431MPa, tensile strength is TS=592 ~ 609MPa, percentage elongation A=22 ~ 23%, strong flexor ratio TS/YS=1.37 ~ 1.42, meet the requirement of anti-seismic performance index and HRB400E level reinforcing bar, its microscopic structure is ferrite-pearlite and the part bainite structure of refinement, there is not any martensitic structure, as shown in Figure 5 in steel area., all there is not surperficial red Fe in the hot-rolled high-strength reinforcing bar of all employing spray vaporization cooling devices and method 2o 3rusty scale.

Claims (7)

1. for a spray vaporization cooling device for hot-rolled high-strength reinforcing bar, it is characterized in that, this device comprises water and air supply system, spray vaporization cooling device, infrared radiation thermometer and computer operating system; Wherein, air feed water system is made up of water-main, screen pack, gas main, air accumulator, vavle shelf system, feed pipe and air supply pipe; Each Pressure gauge of vavle shelf system and flowmeter will to supply water and the pressure of air feed and flow parameter send computer operating system to by far distance instrument signal respectively;
Spray vaporization cooling device is made up of six cooling sections, 15 cooling units are comprised in every section, in each cooling unit, 4 spray vaporization cooling jets are installed, these 4 nozzle layouts facing each other at grade, between adjacent nozzle mutually at an angle of 90, each jet expansion aims at the longitudinal centre line of the hot-rolled reinforced bar run along each section of cooling device center line;
Three infrared radiation thermometers adopted, comprise the temperature measurer T1 in finish to gauge frame exit, the temperature measurer T2 in six sections of spray vaporization cooling device exits, the temperature measurer T3 of cold bed porch, return Wen Wendu T3 when respectively the finishing temperature T1 of hot-rolled reinforced bar, hot-rolled reinforced bar being entered cold bed through the final cooling temperature T2 after spray vaporization cooling device, hot-rolled reinforced bar, carry out continuous on-line testing and be sent to computer operating system.
2., as claimed in claim 1 for the spray vaporization cooling device of hot-rolled high-strength reinforcing bar, it is characterized in that, spray vaporization cooling jet, be made up of water inlet, air inlet, diversion cavity, mixed aerosol chamber, nut and waterfog head; The water inlet (1) on spray vaporization cooling jet top is connected with diversion cavity (3) respectively with air inlet (4); Diversion cavity (3) is connected with the mixed aerosol chamber (2) of spray vaporization cooling jet bottom, makes the gentle mixed aerosol under stress of water; Nut (5), for connecting mixed aerosol chamber (2) and waterfog head (6), makes the water smoke formed in mixed aerosol chamber (2) penetrate from shower nozzle (6);
Spray vaporization cooling jet respectively by water inlet and air inlet metal hose with to supply water in each section and gas manifold is connected, the water supply in each cooling section and gas manifold respectively by confession the first penstock (W1) ~ the 6th penstock (W6) with the first air-supplying valve (G1) ~ ((G6) is connected with feed pipe and air supply pipe the 6th air-supplying valve.
3. as claimed in claim 1 for the spray vaporization cooling device of hot-rolled high-strength reinforcing bar, it is characterized in that, computer operating system, comprises programmable controller PLC, display and control inerface program, far distance instrument Signal reception program, on-line monitoring operating system, technological parameter and mechanical performance data storehouse; Computer operating system passes through receiving system, display interface and regulator control system, the cooling velocity of monitor and forecast spray vaporization cooling parameter and hot-rolled reinforced bar.
4. as claimed in claim 1 or 2 for the spray vaporization cooling device of hot-rolled high-strength reinforcing bar, it is characterized in that, each spray vaporization cooling jet respectively by water inlet and air inlet metal hose with to supply water in each section and gas manifold is connected, the water supply in each cooling section is connected with feed pipe and air supply pipe with the first air-supplying valve (G1) ~ the 6th air-supplying valve (G6) respectively by the first penstock (W1) ~ the 6th penstock (W6) with gas manifold.
5. as claimed in claim 1 for the spray vaporization cooling device of hot-rolled high-strength reinforcing bar, it is characterized in that, this device also comprises: in each cooling unit porch of each cooling section, installation is provided with primary atomization cooling circumferential weld sparge pipe, make that there is the stratiform current of certain speed and pressure and the airflow layer mixed aerosol around high-speed cruising reinforcing bar, and form primary atomization cooling zone, run the high velocity air layer that produces of reinforcing bar to the secondary-atomizing of water smoke and elegant dissipation effect to make up high speed VR=9.5-12.5m/s.
6. as claimed in claim 1 for the spray vaporization cooling device of hot-rolled high-strength reinforcing bar, it is characterized in that, this device also comprises: vapour collect cover, dry pipe and air exhauster that the water vapour that the cooling of each cooling section extraction spray vaporization produces is used, to get rid of the steam that each spray vaporization cooling section produces, improve heat exchange and cooling effectiveness.
7. adopt device described in claim 1 to carry out a method for spray vaporization cooling to hot-rolled high-strength reinforcing bar, it is characterized in that, processing step is as follows:
(1) by the pressure of the aqueous vapor of vavle shelf system and Flow-rate adjustment to technological requirement, according to the difference of hot-rolled reinforced bar format diameter, adopt different hydraulic pressure/air pressure and the water yield/tolerance proportioning; Wherein: hydraulic pressure regulates within the scope of 0.2 ~ 1.2MPa, air pressure regulates within the scope of 0.0 ~ 0.8MPa, the water yield is at 20 ~ 200m 3within the scope of/h, adjustment, tolerance are at 0 ~ 3600m 3regulate within the scope of/h, check that whether the Pressure gauge supplied water with air feed system is accurately consistent with computer operation interface display reading with meter readings simultaneously, and after the stable aqueous vapor pressure/flow technological parameter reaching setting requires, hydraulic pressure 0.6 ± 0.1MPa, air pressure 0.6 ± 0.1MPa, the water yield 100 ± 10m 3/ h, tolerance 1800 ± 100m 3start within the scope of/h to carry out online spray vaporization cooling to hot-rolled reinforced bar;
(2) temperature moves to six group spray vaporization cooling devices from last rolling mill of mm finishing mill unit to be greater than 7m/s speed at the reinforcing bar of 1000 ± 50 DEG C;
(3), the reinforcing bar of operation passes successively in first to the 6th water mist vaporizing device, according to the difference of bar diameter, adopts different hydraulic pressure/air pressure, the water yield/tolerance proportioning; Wherein: hydraulic pressure regulates in 0.2MPa to 1.2MPa scope, air pressure regulates in 0.0MPa to 0.8MPa scope, the water yield regulates in 20m3/h to 200m3/h scope, tolerance regulates in 0 to 3600m3/h scope, the surface being ejected into reinforcing bar from jet expansion after obtaining the water fog particle of different grain size diameter cools;
(4) reinforcing bar run passes first cooling unit of first group, the water smoke that four nozzles be arranged symmetrically with in this unit eject different grain size and diameter makes reinforcing bar being cooled by surface during this region, then enter in the bellmouth of fixed nozzle and carry out returning temperature, return the reinforcing bar after temperature to cool through second unit successively, what then enter second unit returns in warm bellmouth, again and again return warm bellmouth through 15 cooling unit coolings and 15 successively, so far the cooling procedure of the 0.3s to 0.6s in first group of spray vaporization cooling device is completed,
(5) reinforcing bar run is after have passed through first group of spray vaporization cooling device, through the cover pipe connection of a long 1000mm, carry out being less than in this jockey 0.14s return temperature after enter into second group of water smoke gasification refrigerating mechanism, repeat the process of step (4);
(6) repeat step (4) and step (5) successively until proceed to after the 6th group of water mist vaporizing device cool, the rebar surface temperature of operation is reduced to T by 1000 ± 50 DEG C by this stepped cooling means in 1s to 3s 3less than <600 DEG C.
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CN109675941A (en) * 2018-12-29 2019-04-26 钢铁研究总院 A kind of cold bed control cooling device of hot-rolled microalloy reinforcing bar
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CN111057836A (en) * 2019-12-31 2020-04-24 钢铁研究总院 Control method for cooling path of high-strength steel bar
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CN113528775A (en) * 2021-07-29 2021-10-22 江苏联峰实业有限公司 Spray quenching device and application thereof in simulating lead bath heat treatment to obtain sorbite structure
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CN106391734A (en) * 2016-08-17 2017-02-15 钢铁研究总院 Sectional step type cooling device for hot rolling of high-strength steel bars
CN106957991A (en) * 2017-05-08 2017-07-18 钢铁研究总院 A kind of precipitation Controlled cooling process of hot-rolled microalloy reinforcing bar
CN106957991B (en) * 2017-05-08 2018-07-03 钢铁研究总院 A kind of precipitation Controlled cooling process of hot-rolled microalloy reinforcing bar
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CN112775180A (en) * 2020-12-16 2021-05-11 江苏省镔鑫钢铁集团有限公司 Fine-grain deformed steel bar hot rolling production line
CN113528775A (en) * 2021-07-29 2021-10-22 江苏联峰实业有限公司 Spray quenching device and application thereof in simulating lead bath heat treatment to obtain sorbite structure
CN114178309A (en) * 2021-11-15 2022-03-15 广州广钢新材料股份有限公司 Controlled cooling method and device for hot-rolled ribbed steel bar

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