CN104846166A - On-line continuous-casting billet quenching equipment and process thereof - Google Patents
On-line continuous-casting billet quenching equipment and process thereof Download PDFInfo
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Abstract
The invention discloses on-line continuous-casting billet quenching equipment and a process thereof. The on-line continuous-casting billet quenching equipment is used for quenching a casting billet on a continuous-casting equipment production line and comprises a quenching roller bed, a water tank and a water inlet pipe, wherein the water tank is arranged in a casting billet pulling direction; the quenching roller bed is located in the water tank and communicated with the water tank; a casting billet inlet and a casting billet outlet are formed in two ends of the water tank; and opening-closing door panels are arranged at the casting billet inlet and the casting billet outlet. The casting billet is conveyed into the water tank by the continuous-casting quenching roller bed after being cut to a specified length, and the water inlet pipe supplies water into the water tank to ensure that the casting billet is completely immersed in water during the quenching process; after quenching for a period of time, a rear gate (namely the rear door panel) is opened, and after the casting billet is conveyed out of the water tank by the quenching roller bed, the rear gate is closed, and the water inlet pipe continues supplying water into the water tank to a specified level. The on-line continuous-casting billet quenching equipment can well finish the quenching process of the casting billet which needs to be treated in during continuous casting process, and meanwhile has the characteristics of small investment, simple structure, convenience in later maintenance and high practicability.
Description
Technical field
The present invention relates to metal freezing and continuous casting technical field, particularly a kind of continuous-cast blank press quenching equipment and technique thereof.
Background technology
The surface quality of Rolling production stocking depends on quantity and the form of rolled piece grain boundary precipitate in the hot rolling.Precipitate can hinder crystal boundary to move in materials hot deformation process, thus produce mechanical stress in these positions, just crackle is there will be when the mechanical stress of these positions oversteps the extreme limit stress, in the scope of 650-1000 DEG C of the temperature of hot rolling stocking, in this temperature range, the N precipitates such as such as AlN, BN, VCN and NbCN can the serious ductility reducing metal.
In order to avoid the generation of above-mentioned phenomenon, hard surfacing is adopted to be the very safe and measure flexibly of one.After hard surfacing, the temperature of casting billet surface can be cooled to less than 300 DEG C.Micrographic test shows, and after quench treatment, can form fine and closely woven tempered martensite structure layer at the casting billet surface of about 20mm.Compared with the interior tissue without cooling process, this Rotating fields on surface wants much meticulous.Cutting machine by quenching box through overdoing at strand, entering in the process of ejection roller way, the heat that the Malpighian layer that its surface is formed because of cooling can be gone out by strand center conductive carries out tempering.Through such process, the form compact and stable structure of one deck just can be formed at strand extexine.Through such process, strand after the heating, can form good grain-size, and only has a small amount of AlN to separate out in grain boundary.Thus avoid in the hot rolling, because AlN separates out the remarkable reduction of the austenite crystal border ductility caused.
Some iron and steel enterprises take the rate of becoming a useful person in order to improve stocking, realize special steel heat and send, and it is desirable to carry out hard surfacing process to strand before heat is sent, even if those are to the steel grade of red brittleness sensitivity like this, after quench treatment, also can not have problems when heat is sent.After hard surfacing, some producers have substantially achieved 100% heat and have sent, and need not worry that casting condition and operating delay impact.
Application number be the Chinese patent of 201410355167.X disclose a kind of by strand slow cooling to the technique of carrying out during 500-600 DEG C quenching, the strand after quenching is heated to 170-200 DEG C and carries out insulation tempering.This patent is that after being rolled off the production line by continuously cast bloom, slow cooling is being quenched to 500-600 DEG C, can not realize strand press quenching and heat is sent.
Chinese patent 201420270663.0 discloses a kind of heat treatment quenching device, according to this patent, this device comprises cooling cylinder, tank, rising pipe and water inlet pipe, described rising pipe and water inlet pipe lay respectively at tank both sides, described water inlet pipe one end is communicated with cooling cylinder, the other end of water inlet pipe stretches into bottom of gullet, described rising pipe one end is communicated with cooling cylinder, the rising pipe the other end is arranged on tank side surface upper part, described rising pipe is corresponding with the junction, side of tank is provided with the posticum that rising pipe can be made to be communicated with tank, flow deflector is provided with near water inlet pipe place in described tank, described flow deflector is provided with some pod apertures.This heat treatment quenching device adopts condenser, makes water coolant to carry out circulating cooling, adopts multitube water inlet and water outlet, and in tank, sets up the flow deflector with pod apertures, add the fluctuation of current, add cooling efficiency, improve cooling performance.But this quenching heat treatment device processes mainly for line lower component or part, cannot be used for continuous casting production process.
Chinese patent 201320366648.1 discloses a kind of slab surface quenching device, according to this patent, between the conveying roller that continuous casting cutting rollgang is adjacent, arranges upper and lower two groups of set of nozzles.Microalloy steel grade can be gone out the high temperature steel slab surface temperature after fan-shaped section and be down to less than 600 DEG C fast by this device, nitride or the carbonitride of the microalloy elements such as Nb, V, Ti, Al, B that effective suppression is thick are separated out at austenite grain boundary, thus avoid micro-alloyed steel heat to send the generation of micro cracks on surface of steel plate after rolling.But the mode of this spray quench easily causes casting billet surface spray uneven thus cause casting billet surface quenching effect inconsistent.Spray state labile, slab quality is unstable, and practicality is poor.
Chinese patent 201420486096.2 discloses a kind of top spray device for slab direct quenching device, and according to this patent, this device installation, in the entrance of quenching refrigerating device and exit, comprises water inlet pipe, cooling manifold, switch-valve and nozzle; Can improve the homogeneity of steel billet temperature and performance, drainage effect is good, can eliminate the backflow phenomena of surface of steel plate, the water coolant of direct quenching cooling apparatus entrance can be removed clean.This quench treatment mode is all steel rolling region quenching heat treatment device, can not carry out quench treatment, cannot reach the effect of continuously cast bloom quench treatment to continuously cast bloom.
Chinese patent 201420143456.9 discloses a kind of spray quenching device, according to this patent, this device is used for carrying out quench treatment to thrust wheel surface, it comprises spray chamber, the inwall of described spray chamber is provided with nozzle, in the bottom of described spray chamber, base plate is housed, described base plate contacts with the inwall of described spray chamber, forms sealed environment.Nozzle is arranged in array, outside described spray chamber, be arranged with sprayed tank, is connected with described nozzle, and described nozzle controls quantity for spray and spraying rate by PLC.The outer quenching heat treatment of line, mainly for some parts and part, cannot be applied in casting process.
Summary of the invention
The shortcoming of prior art in view of the above, the invention provides a kind of continuous-cast blank press quenching equipment and technique thereof, object is effectively to suppress the nitride of the microalloy elements such as thick Nb, V, Ti, Al, B or carbonitride to separate out at austenite grain boundary, thus avoids micro-alloyed steel heat to send the generation of micro cracks on surface of steel plate after rolling.
For achieving the above object and other relevant objects, the invention provides following technical scheme:
A kind of continuous-cast blank press quenching equipment, on continuous casting installation for casting production line, strand is quenched, comprise quenching roller-way, tank and water inlet pipe, described tank is arranged along strand throwing direction, described quenching roller-way is positioned at tank, described water inlet pipe is communicated with tank, and described tank two ends are provided with strand import and strand outlet, and described strand import and strand outlet are provided with switch door-plate.
Adopt said structure, continuous casting installation for casting production line arranges quenching apparatus, and strand submergence in the process of quenching roller-way stop is quenched in the sink, uniform quenching, ensure the continuity of producing, and avoid micro-alloyed steel heat to send the generation of micro cracks on surface of steel plate after rolling; The roller-way that wherein quenches is the roller-way that continuous casting installation for casting carries, and the quenching roller-way in tank is concordant with outside roller-way.
Before continuous-cast blank enters process furnace, continuous casting cutting rollgang carries out surperficial fast cooling, temperature is reduced to less than 600 DEG C fast, between the conveying roller that roller-way is adjacent after continuous casting cutting, a quenching tank is set, press quenching is carried out to strand, nitride or the carbonitride of the microalloy elements such as Nb, V, Ti, Al, B that effective suppression is thick are separated out at austenite grain boundary, thus avoid micro-alloyed steel heat to send the generation of micro cracks on surface of steel plate after rolling.
As preferably: be connected with water jet standpipe above described water inlet pipe, described water jet standpipe is positioned at above tank, arrange along tank length direction, and parallel with tank, water jet standpipe offering water spray seam or spout hole.Be arranged on and be convenient to from moisturizing above strand, make its integral quenching good uniformity, water inlet pipe also can be connected with tank bottom surface or side.Water inlet pipe can be arranged on the both sides of bottom of gullet and length direction simultaneously.
As preferably: described tank is the uncovered cuboid-type in top, and the length of described water jet standpipe is equal with tank length.
As preferably: described bottom of gullet is provided with scum pipe, is provided with iron sheet slag collection bucket below scum pipe.
As preferably: scum pipe is provided with valve, bottom described iron sheet slag collection bucket and sidewall offer leaking hole.
Collected by the iron scale of iron sheet slag collection bucket to strand, avoid being scattered everywhere.
As preferably: described water inlet pipe is provided with variable valve, is provided with liquidometer in described tank, described liquidometer and variable valve are all connected with the Controlling System of continuous casting installation for casting.By real-time level monitoring, realize moisturizing.
As preferably: described switch door-plate is automatic or manual lifting gate.
As preferably: described tank is arranged on the cutting machine rear of continuous casting installation for casting.
The present invention also provides a kind of quenching technology of continuous-cast blank press quenching equipment simultaneously, described quenching apparatus comprises quenching roller-way, tank and water inlet pipe, described tank is arranged along strand throwing direction, described quenching roller-way is positioned at tank, described water inlet pipe is communicated with tank, and the strand import of tank and strand outlet are respectively arranged with early gate and late gate; Described quenching technology following steps:
First strand is cut into scale; Then strand is sent to tank front by the roller-way of continuous casting installation for casting, tank early gate is opened, and strand is sent into early gate after tank and closed by quenching roller-way, water inlet pipe to moisturizing in tank to ensure that in quenching process, strand is by the complete submergence of water; Quenched rear unlatching late gate, and after strand is sent tank by roller-way to be quenched, late gate cuts out, and water inlet pipe is to moisturizing in tank to specified altitude assignment.
As preferably: arrange liquid level detection gauge in described tank, water inlet pipe arranges variable valve, liquid level detection gauge is all connected with Controlling System with variable valve, and when liquid level detection gauge detects water level lower than setting liquid level, Controlling System is opened variable valve and carried out moisturizing.
As preferably: described strand is water-bath in static 3-5 minute quenching in tank, ensures that in tank, the water surface exceeds strand more than upper surface 50mm in quenching process.During static one end chien shih its fully quench.
As mentioned above, the invention has the beneficial effects as follows:
1, continuous casting press quenching apparatus design structure is simple, operation steps simple, can realize the full-automatic press quenching process of strand, and safeguard that cleaning is convenient, ensure the homogeneity of casting billet surface quenching, practicality is stronger.Can real-time selection quench treatment or non-quench treatment.
2, microalloy steel grade is gone out the high temperature steel slab surface temperature after fan-shaped section and be down to less than 600 DEG C fast, nitride or the carbonitride of the microalloy elements such as Nb, V, Ti, Al, B that effective suppression is thick are separated out at austenite grain boundary, thus avoid micro-alloyed steel heat to send the generation of micro cracks on surface of steel plate after rolling.
3, water saving, effectively collects oxide compound iron sheet slag.
Accompanying drawing explanation
Fig. 1 is the structural representation of continuous-cast blank press quenching equipment in the present invention;
Fig. 2 is the front view of continuous-cast blank press quenching equipment in the present invention;
Fig. 3 is the sectional view of continuous-cast blank press quenching equipment in the present invention;
Fig. 4 is process flow sheet of the present invention.
Piece mark explanation
1 continuous casting installation for casting
2 tanks
3 water inlet pipes
4 quenching roller-ways
5 water jet standpipes
6 scum pipes
7 early gates
8 late gates
9 strands
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this specification sheets can understand other advantages of the present invention and effect easily.
Orientation mentioned in the present embodiment, with from rear to front direction for injection direction.
As shown in Figure 1 to Figure 3, the invention provides a kind of continuous-cast blank press quenching equipment, this quenching apparatus is arranged on continuous casting installation for casting 1 production line, comprise quenching roller-way 4, tank 2 and water inlet pipe 3, tank 2 is arranged on continuous casting installation for casting 1 along strand 9 throwing direction, and tank 2 is positioned at the cutting machine rear of continuous casting installation for casting 1, and quenching roller-way 4 is positioned at tank 2, water inlet pipe 3 is communicated with tank 2, and the strand import of tank 2 and strand outlet are respectively arranged with early gate 7 and late gate 8.
In this example, tank 2 is the uncovered cuboid in top, and length is greater than the length of the longest strand 9 scale, and tank 2 is highly greater than quenching roller-way 4 diameter and maximum strand 9 thickness sum, and tank 2 width is wider than the width of quenching roller-way 4.Top in the middle part of tank 2 is located at by water inlet pipe 3, and be connected with water jet standpipe 5 above water inlet pipe 3, water jet standpipe 5 is positioned at above tank 2, arranges along tank 2 length direction, and parallel with tank 2, water jet standpipe 5 offers water spray seam or spout hole.The length of water jet standpipe 5 is equal with tank 2 length.Water inlet pipe 3 also can be located at bottom the tank 2 or both sides of length direction.
For the ease of cleaning and collection iron scale, tank 2 bottom centre is provided with scum pipe 6, is provided with iron sheet slag collection bucket (not shown) below scum pipe 6.Scum pipe 6 is provided with manually-operated gate, bottom iron sheet slag collection bucket, offers leaking hole with sidewall.
Water inlet pipe 3 is provided with variable valve, is provided with liquidometer in tank 2, liquidometer and variable valve are all connected with the Controlling System of continuous casting installation for casting 1.Switch door-plate is automatic or manual lifting gate.By liquid level in liquidometer Real-Time Monitoring tank 2, when water level is lower than set(ting)value, carry out moisturizing, ensure liquid level in tank 2.
As shown in Figure 4: the present invention provides a kind of quenching technology of continuous-cast blank press quenching equipment simultaneously, comprise above-mentioned continuous-cast blank press quenching equipment, its processing step is as follows:
In tank 2, original state is filled water or is reached the water level of setting, after strand 9 presses certain Length-fixing cutting on cutting machine, after cutting, roller-way conveying strand 9 is to quenching roller-way 4, on continuous casting press quenching equipment, proofing unit detects that strand 9 arrives, the means such as infrared detection can be adopted, the early gate 7 of tank 2 automatic or manual lifting is opened, liquid level declines, when liquid level drops to lower than setting liquid level, moisturizing in tank 2 opened automatically by water inlet pipe 3 variable valve, after strand 9 enters tank 2 completely, early gate 7 cuts out, moisturizing makes the water surface in tank 2 must higher than more than strand 50mm, the any position of strand 9 must not be allowed exposed to outside the water surface, about 100mm is got in this example.Strand 9 stops at water-bath in the static 3-5 of correct position minute quenching in tank 2.Strand 9 opens late gate 8 after fully quenching, and starts quenching roller-way 4 and strand 9 is transported to ejection roller way, and strand 9 leaves quenching roller-way 4 late gate 8 and closes, and water inlet pipe 3 continues moisturizing in tank 2 until reach level set liquid level.
The oxide scale slag that quenching produces can be discharged by scum pipe 6, iron sheet slag collection bucket can be established to collect down.
It should be noted that, any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. a continuous-cast blank press quenching equipment, on continuous casting installation for casting production line, strand is quenched, it is characterized in that: comprise quenching roller-way, tank and water inlet pipe, described tank is arranged along strand throwing direction, described quenching roller-way is positioned at tank, described water inlet pipe is communicated with tank, and described tank two ends are provided with strand import and strand outlet, and described strand import and strand outlet are provided with switch door-plate.
2. a kind of continuous-cast blank press quenching equipment according to claim 1, it is characterized in that: be connected with water jet standpipe above described water inlet pipe, described water jet standpipe is positioned at above tank, arranges along tank length direction, and parallel with tank, water jet standpipe offers water spray seam or spout hole.
3. a kind of continuous-cast blank press quenching equipment according to claim 2, is characterized in that: the cuboid-type that described tank is uncovered above being, the length of described water jet standpipe is equal with tank length.
4. a kind of continuous-cast blank press quenching equipment according to claim 1, is characterized in that: described bottom of gullet is provided with scum pipe, is provided with iron sheet slag collection bucket below scum pipe.
5. a kind of continuous-cast blank press quenching equipment according to claim 4, is characterized in that: described scum pipe is provided with valve, offers leaking hole bottom described iron sheet slag collection bucket with sidewall.
6. a kind of continuous-cast blank press quenching equipment according to claim 1, it is characterized in that: described water inlet pipe is provided with variable valve, be provided with liquidometer in described tank, described liquidometer and variable valve are all connected with the Controlling System of continuous casting installation for casting.
7. a kind of continuous-cast blank press quenching equipment according to claim 1 and 2, is characterized in that: described tank is arranged on the cutting machine rear of continuous casting installation for casting, and described bottom of gullet and both sides are provided with water inlet pipe.
8. the quenching technology of a continuous-cast blank press quenching equipment, it is characterized in that: described quenching apparatus comprises quenching roller-way, tank and water inlet pipe, described tank is arranged along strand throwing direction, described quenching roller-way is positioned at tank, described water inlet pipe is communicated with tank, and the strand import of tank and strand outlet are respectively arranged with early gate and late gate; Described quenching technology following steps:
First strand is cut into scale; Then strand is sent to tank front by the roller-way of continuous casting installation for casting, tank early gate is opened, and strand is sent into early gate after tank and closed by quenching roller-way, water inlet pipe to moisturizing in tank to ensure that in quenching process, strand is by the complete submergence of water; Quenched rear unlatching late gate, and after tank sent by strand by roller-way to be quenched, late gate cuts out, and water inlet pipe is to moisturizing in tank to specified altitude assignment.
9. the quenching technology of a kind of continuous-cast blank press quenching equipment according to claim 8, it is characterized in that: in described tank, liquid level detection gauge is set, water inlet pipe arranges variable valve, liquid level detection gauge is all connected with Controlling System with variable valve, when liquid level detection gauge detects water level lower than setting liquid level, Controlling System is opened variable valve and is carried out moisturizing.
10. the quenching technology of a kind of continuous-cast blank press quenching equipment according to claim 9, is characterized in that: described strand is water-bath in static 3-5 minute quenching in tank, ensures that in tank, the water surface exceeds strand more than upper surface 50mm in quenching process.
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| CN201510308666.8A CN104846166A (en) | 2015-06-08 | 2015-06-08 | On-line continuous-casting billet quenching equipment and process thereof |
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| CN201510308666.8A CN104846166A (en) | 2015-06-08 | 2015-06-08 | On-line continuous-casting billet quenching equipment and process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593933A (en) * | 2019-01-15 | 2019-04-09 | 北京科技大学 | A kind of slab automatic on-line quenching unit and method |
| CN111187888A (en) * | 2020-03-05 | 2020-05-22 | 四川福蓉科技股份公司 | Quenching water tank |
| CN114734012A (en) * | 2022-03-30 | 2022-07-12 | 东北大学 | Slab surface quenching system and process based on horizontal section of continuous casting machine |
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| US4149703A (en) * | 1978-01-31 | 1979-04-17 | Drever Company | Apparatus for quenching a heated metal plate |
| US4534198A (en) * | 1982-09-15 | 1985-08-13 | Bwg Bergwerk - Und Walzwerk-Maschinenbau Gmbh | Cooling hot-rolled steel strip |
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| CN203284429U (en) * | 2013-06-25 | 2013-11-13 | 济钢集团有限公司 | Continuous casting slab surface quenching device |
| CN204690057U (en) * | 2015-06-08 | 2015-10-07 | 中冶赛迪工程技术股份有限公司 | A kind of continuous-cast blank press quenching equipment |
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| US3990257A (en) * | 1973-05-09 | 1976-11-09 | Inland Steel Company | Method for cooling workpieces in a liquid bath |
| US4149703A (en) * | 1978-01-31 | 1979-04-17 | Drever Company | Apparatus for quenching a heated metal plate |
| US4534198A (en) * | 1982-09-15 | 1985-08-13 | Bwg Bergwerk - Und Walzwerk-Maschinenbau Gmbh | Cooling hot-rolled steel strip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593933A (en) * | 2019-01-15 | 2019-04-09 | 北京科技大学 | A kind of slab automatic on-line quenching unit and method |
| CN109593933B (en) * | 2019-01-15 | 2024-01-23 | 北京科技大学 | Automatic online quenching device and method for casting blank |
| CN111187888A (en) * | 2020-03-05 | 2020-05-22 | 四川福蓉科技股份公司 | Quenching water tank |
| CN114734012A (en) * | 2022-03-30 | 2022-07-12 | 东北大学 | Slab surface quenching system and process based on horizontal section of continuous casting machine |
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Application publication date: 20150819 |