CN104032120A - Segmented gas seal type heat treatment process of hot-galvanized strip steel and alloying furnace thereof - Google Patents
Segmented gas seal type heat treatment process of hot-galvanized strip steel and alloying furnace thereof Download PDFInfo
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Abstract
The invention discloses a segmented gas seal type heat treatment process of hot-galvanized strip steel and an alloying furnace thereof. The process comprises the following steps: the heating, the heat insulation and the cooling are sequentially performed for strip steel output from a zinc pot online; and finally, the alloying of the strip steel is realized; the key is to control the heat insulation temperature within 500-550 DEG C and the heat insulation time within 10-15 s at a middle heat insulation section of the alloying furnace; meanwhile, a gas injection manner and a gas extraction manner are respectively performed on the two side surfaces of the strip steel, so that at least one high-temperature gas curtain perpendicular to the strip steel conveying direction is formed in the middle heat insulation section, heat is centralized and controlled in a partition area formed by the high-temperature gas curtain, and a chimney effect in the middle heat insulation section is stopped. The alloying furnace comprises a bottom heating section, the middle heat insulation section and an upper cooling section, wherein at least one set of high-temperature gas curtain generator is arranged on the middle heat insulation section. The process and the alloying furnace can restrain the generation of the chimney effect, reduce the heat emission of the heat insulation section, and improve the heat treatment efficiency.
Description
Technical field
The present invention relates to hot-dip galvanized steel strip and manufacture field, refer to particularly a kind of hot-dip galvanized steel strip segmentation air sealed thermal treatment process and alloying furnace thereof.
Background technology
Hot-dip galvanizing sheet steel is because of its lower production cost, corrosion resistance nature, coating performance, welding property and shock resistance preferably, be applicable to being very much applied to the high-grade pot galvanize product consumption such as automobile, household electrical appliances industry, can meet the specification of quality of user to product high-quality surface property and good internal performance.
The hot-dip galvanized steel strip of exporting from zinc pot need to complete multistage thermal treatment conventionally in alloying furnace, and current technique is the annealing treating process of " low temperature after first high temperature " in the world, and according to different steel grades, its technological temperature and soaking time also have fine distinction.But, in a large amount of situ production practices, the difficulties existing is that hot-dip galvanized steel strip is higher in the stability requirement of the required alloying reaction temperature of alloying furnace heating zone, holding-zone and cooling section, and slightly deviation just cannot obtain good alloying layer and good anti-efflorescence characteristic.
At present, alloying furnace in industrial application adopts vertical form more, body of heater is positioned at zinc pot top and controls directly over the air knife of thickness of coating, upwards be furnished with respectively bottom-heated section, middle part holding-zone and the top cooling section of alloying furnace along air knife, every section of temperature all needs to follow annealing process curve and rate request (being soaking time).Traditional middle part holding-zone adopts two-part structure more, one section of movement, and one section is fixing, surrounding is hermetically sealed, and only both ends open makes to be with steel to pass through, and electromagnetic induction or hot resistance heating unit are installed therein, for the insulation with steel, complete the alloying annealing process with steel.Initial temperature with steel alloying annealing is 460 DEG C of left and right of zinc liquid in zinc pot, then through the heating of bottom-heated section, reaches 530～550 DEG C of left and right and enter middle part holding-zone, and keep for some time, to obtain good alloying layer.
But, be subject to the impact of the alloying furnace " chimneyeffect " of vertical, even in the situation that stove integral sealing is intact, heat is also very easily upwards emitted to upper end from holding-zone lower end, middle part, lower end is entered supplementary by freezing air, thereby cause holding-zone upper end, middle part temperature higher than lower end temperature, its harm is mainly reflected in four aspects: one, whole technological process cannot meet the requirement of " low temperature after first high temperature ", causes quality can not stablize control; Two, the quick dissipation of heat cannot guarantee that middle part holding-zone remains on the technological temperature of 530～550 DEG C, and only 480 DEG C of holding temperatures sometimes, even cannot complete alloying process smoothly; The heat of three, being gone out by middle part holding-zone dissipation is larger, and band steel upper end temperature is higher, can propose high requirement, the further like this quality product that affected to the cooling power of top cooling section; Four, heat loss also causes disadvantageous effect to plating rear miscellaneous equipment, reduces the work-ing life of these equipment.
Summary of the invention
Object of the present invention will provide exactly one can suppress " chimneyeffect " generation, reduces middle part holding-zone heat dissipation, guarantee the stay-in-grade hot-dip galvanized steel strip segmentation of products obtained therefrom air sealed thermal treatment process and alloying furnace thereof.
For achieving the above object, the hot-dip galvanized steel strip segmentation air sealed thermal treatment process that the present invention is designed, is that the band steel to exporting from zinc pot heats online successively, insulation, cooling, finally realizes the process with steel alloying, its special character is, it comprises the steps:
1) first by through pot galvanize processing be delivered to the bottom-heated section of alloying furnace with steel, controlling Heating temperature is 520～560 DEG C, be 5～8s heat-up time;
2) then will upwards be delivered to the middle part holding-zone of alloying furnace with steel, controlling holding temperature is 500～550 DEG C, and soaking time is 10～15s; Meanwhile, by with steel the two sides jet and mode of bleeding respectively, make to form at least one perpendicular to the high temperature gas curtain with steel throughput direction in the holding-zone of middle part, thereby in the marker space that heat centralized Control is formed at high temperature gas curtain, intercept the chimneyeffect in the holding-zone of middle part;
3) finally will continue to be upwards delivered to the top cooling section of alloying furnace with steel, controlling temperature out is 280～320 DEG C.
Preferably, described step 1) in, controlling Heating temperature is 530～550 DEG C; Described step 2) in, controlling holding temperature is 520～550 DEG C.Control its temperature with steel in the scope of 530～550 DEG C when the bottom-heated section, control its temperature with steel in the scope of 520～550 DEG C when the holding-zone of middle part, can obtain the alloying layer that quality is higher.
Preferably, described step 2) in, the jet velocity of high temperature gas curtain is 20～60m/s, gas curtain temperature is 400～600 DEG C, so that the better effects if of middle part holding-zone segmentation insulation.
Best, described step 2) in, the jet velocity of high temperature gas curtain is 30～50m/s, gas curtain temperature is 490～550 DEG C, can make the effect of middle part holding-zone segmentation insulation best.
Preferably, described step 2) in, high temperature gas curtain is formed with twice, is positioned at together the centre of middle part holding-zone, and another road is positioned at holding-zone exit, middle part.Twice high temperature gas curtain is divided into middle part holding-zone between different heat preservation zone, can require according to alloying the temperature of meticulous its each heat preservation zone of control, intercepts " chimneyeffect ", further prevents heat leakage.
The present invention realizes the hot-dip galvanized steel strip segmentation air sealed alloying furnace that above-mentioned technique designs, comprise bottom-heated section, middle part holding-zone and top cooling section, in described bottom-heated section, be provided with induction heater, in arranging, described middle part holding-zone has resistance heater, its special character is, on the holding-zone of described middle part, be at least provided with a set of high temperature air curtain generator, described high temperature air curtain generator has the row's air nozzle and the row's air exhaust nozzle that are separately positioned on steel two sides, and described air nozzle and air exhaust nozzle are along the even contour layout of strip width direction; And the output terminal of described air nozzle is vertical just to the side with steel, the input terminus of described air nozzle is connected with one end of circulation air path; The input terminus of described air exhaust nozzle is vertical just to the another side with steel, and the output terminal of described air exhaust nozzle is connected with the other end of circulation air path; On described circulation air path, be provided with recirculation blower, when described recirculation blower work, can forming the high temperature gas curtain perpendicular to its throughput direction with steel two sides.
As one of preferred version, described middle part holding-zone is integral cavity structure, on it, be provided with two cover high temperature air curtain generators, a set of high temperature air curtain generator is arranged on the centre of middle part holding-zone, and another set of high temperature air curtain generator is arranged on holding-zone exit, middle part.The integral cavity structure of middle part holding-zone can increase its resistance to air loss, and the twice high temperature gas curtain that two cover high temperature air curtain generators injections form can be separated into middle part holding-zone between different heat preservation zone, realize the meticulous control of each heat preservation zone temperature, guarantee to realize the annealing process of " low temperature after first high temperature ".
As two of preferred version, described middle part holding-zone is integral cavity structure, is provided with three to quadruplet high temperature air curtain generator on it, respectively overlaps high temperature air curtain generator and arranges along the even interval of middle part holding-zone length direction.The integral cavity structure of middle part holding-zone can increase its resistance to air loss, and multiple high temperature gas curtains that many cover high temperature air curtain generators spray formation can be divided into middle part holding-zone between multiple heat preservation zone, thereby make the temperature of each heat preservation zone require to obtain meticulous control according to alloying.
Further, between the outlet of described middle part holding-zone and the import of top cooling section, be provided with turnover plate type sealing baffle.Turnover plate type sealing baffle can reduce cooling section and holding-zone gaseous exchange, prevents that heat is emitted to top cooling section, reduces the cooling load of top cooling section, extends the work-ing life of cooling section equipment.
Further, the air nozzle of described high temperature air curtain generator and air exhaust nozzle are respectively provided with eight, and the output terminal of each air nozzle and air exhaust nozzle is flat cutter lip.Be flat cutter lip air nozzle output terminal and be easy to form high temperature gas curtain, the output terminal shape of air exhaust nozzle and air nozzle is identical is easy to keep stable gas pressure.
The invention has the advantages that: designed high temperature air curtain generator forms reliable and stable partition air curtain in the holding-zone of middle part, efficiently solve upper and lower uneven, the problem that is prone to " chimneyeffect " of alloying furnace middle part holding-zone heat, the temperature and pressure that can realize in holding-zone gangway, middle part, internal zone territory is stablized, significantly reduce the heat dissipation of holding-zone, guarantee that heat concentrates in each compartmented.Can also be according to processing condition requirement, the insulation power of the different compartmenteds of segmentation control, realizes the meticulous control of segmentation of alloying temperature, obtains best " low temperature after first high temperature " annealing treating process.Meanwhile, to the heat control of middle part holding-zone, stablize on the one hand the processing requirement of middle part holding-zone, reduced on the other hand the cooling load of rear operation, protected follow-up equipment.
Brief description of the drawings
Fig. 1 is the layout orientation schematic diagram of hot-dip galvanized steel strip segmentation air sealed alloying furnace of the present invention on galvanization production line.
Fig. 2 is the refined structure schematic diagram of alloying furnace shown in Fig. 1.
Fig. 3 is the A-A sectional structure schematic diagram in Fig. 2;
In figure: bottom-heated section 1, middle part holding-zone 2, top cooling section 3, high temperature air curtain generator 4, air nozzle 5, air exhaust nozzle 6, circulation air path 7, recirculation blower 8, band steel 9, turnover plate type sealing baffle 10, induction heater 11, resistance heater 12, zinc pot 13, sinking roller 14, air knife 15, furnace top roller 16, high temperature gas curtain Q.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, hot-dip galvanized steel strip segmentation air sealed alloying furnace of the present invention is arranged between the zinc pot 13 and furnace top roller 16 on galvanization production line, draw from the sinking roller 14 in zinc pot 13 with steel 9, control galvanized layer thickness through air knife 15, enter thermal treatment in alloying furnace, finally export around furnace top roller 16.
As shown in Fig. 2～3, this alloying furnace is mainly combined by bottom-heated section 1, middle part holding-zone 2 and top cooling section 3.Wherein, in bottom-heated section 1, be provided with induction heater 11, for band steel 9 is quickly heated up to design temperature; In the holding-zone 2 of middle part, be provided with resistance heater 12, for band steel 9 being incubated to for some time by processing requirement; Between the middle part outlet of holding-zone 2 and the import of top cooling section 3, be provided with turnover plate type sealing baffle 10, for preventing that heat is emitted to top cooling section 3.In the middle of turnover plate type sealing baffle 10, leave for the space of passing through with steel 9.
Middle part holding-zone 2 is integral cavity structure, is provided with two cover high temperature air curtain generators 4 on it, and a set of high temperature air curtain generator 4 is arranged on the centre of middle part holding-zone 2, and another set of high temperature air curtain generator 4 is arranged on holding-zone 2 exits, middle part.Like this, can form twice high temperature gas curtain Q by high temperature air curtain generator 4, middle part holding-zone 2 is divided between two heat preservation zone, realize the meticulous control of two heat preservation zone temperature.Certainly, also can arrange three to quadruplet high temperature air curtain generator 4 at middle part holding-zone 2 according to practical situation, respectively overlap high temperature air curtain generator 4 and arrange along the middle part holding-zone 2 even intervals of length direction.
Particularly, each high temperature air curtain generator 4 has the row's air nozzle 5 and the row's air exhaust nozzle 6 that are separately positioned on steel 9 two sides, and air nozzle 5 and air exhaust nozzle 6 are along the even contour layout of band steel 9 width.Every row's air nozzle 5 and air exhaust nozzle 6 are provided with eight, and the output terminal of each air nozzle 5 and air exhaust nozzle 6 is flat cutter lip.And the output terminal of each air nozzle 5 is vertical just to the side with steel 9, the input terminus of each air nozzle 5 is connected with one end of circulation air path 7; The input terminus of each air exhaust nozzle 6 is vertical just to the another side with steel 9, and the output terminal of each air exhaust nozzle 6 is connected with the other end of circulation air path 7.Meanwhile, recirculation blower 8 is installed on circulation air path 7, when recirculation blower 8 is worked, can forming the high temperature gas curtain Q perpendicular to its throughput direction with steel 9 two sides.
The technological process of above-mentioned hot-dip galvanized steel strip segmentation air sealed alloying furnace is as follows:
1) the band steel 9 of drawing from zinc pot 13 is processed through air knife 15, is delivered to the bottom-heated section 1 of alloying furnace, and heating and temperature control, at 520～560 DEG C, is preferably controlled at 530～550 DEG C, and be 5～8s heat-up time.
2) then will upwards be delivered to the middle part holding-zone 2 of alloying furnace with steel 9, holding temperature is controlled at 500～550 DEG C, is preferably controlled at 520～550 DEG C, and soaking time is 10～15s.Meanwhile, the air nozzle 5 in high temperature air curtain generator 4 and air exhaust nozzle 6 are jet and bleed respectively in band steel 9 two sides, make the interior formation of holding-zone 2 two roads, middle part perpendicular to the high temperature gas curtain Q with steel 9 throughput directions.The jet velocity of high temperature gas curtain Q is controlled at 20～60m/s, is preferably controlled at 30～50m/s, and gas curtain temperature is controlled at 400～600 DEG C, is preferably controlled at 490～550 DEG C.Like this, in the marker space that heat centralized Control can be formed at high temperature gas curtain Q, intercept the chimneyeffect in the holding-zone 2 of middle part.Wherein, be arranged on the high temperature air curtain generator 4 and turnover plate type sealing baffle 10 coordinated in holding-zone 2 exits, middle part, the heat that can effectively reduce middle part holding-zone 2 is emitted to top cooling section 3, increases the cooling power of top cooling section 3, and extends the work-ing life of cooling apparatus.
3) finally will continue to be upwards delivered to the top cooling section 3 of alloying furnace with steel 9, controlling temperature out is 280～320 DEG C, from furnace top roller 16 outputs.
Claims (10)
1. a hot-dip galvanized steel strip segmentation air sealed thermal treatment process, be to from zinc pot (13) output band steel (9) heat successively online, insulation, cooling, the final process that realizes band steel (9) alloying, is characterized in that: it comprises the steps:
1) first will be delivered to the bottom-heated section (1) of alloying furnace through the band steel (9) of pot galvanize processing, controlling Heating temperature is 520～560 DEG C, and be 5～8s heat-up time;
2) then will upwards be delivered to steel (9) the middle part holding-zone (2) of alloying furnace, controlling holding temperature is 500～550 DEG C, and soaking time is 10～15s; Meanwhile, by being with steel (9) the two sides jet mode with bleeding respectively, make to form at least one perpendicular to the high temperature gas curtain (Q) of being with steel (9) throughput direction in middle part holding-zone (2), thereby in the marker space that heat centralized Control is formed at high temperature gas curtain (Q), intercept the chimneyeffect in middle part holding-zone (2);
3) finally will continue to be upwards delivered to steel (9) the top cooling section (3) of alloying furnace, controlling temperature out is 280～320 DEG C.
2. hot-dip galvanized steel strip segmentation air sealed thermal treatment process according to claim 1, is characterized in that: described step 1) in, controlling Heating temperature is 530～550 DEG C; Described step 2) in, controlling holding temperature is 520～550 DEG C.
3. hot-dip galvanized steel strip segmentation air sealed thermal treatment process according to claim 1 and 2, is characterized in that: described step 2) in, the jet velocity of high temperature gas curtain (Q) is 20～60m/s, gas curtain temperature is 400～600 DEG C.
4. hot-dip galvanized steel strip segmentation air sealed thermal treatment process according to claim 1 and 2, is characterized in that: described step 2) in, the jet velocity of high temperature gas curtain (Q) is 30～50m/s, gas curtain temperature is 490～550 DEG C.
5. hot-dip galvanized steel strip segmentation air sealed thermal treatment process according to claim 1 and 2, it is characterized in that: described step 2) in, high temperature gas curtain (Q) is formed with twice, be positioned at together the centre of middle part holding-zone (2), another road is positioned at holding-zone (2) exit, middle part.
6. one kind for realizing the hot-dip galvanized steel strip segmentation air sealed alloying furnace that technique designs described in claim 1, comprise bottom-heated section (1), middle part holding-zone (2) and top cooling section (3), in described bottom-heated section (1), be provided with induction heater (11), in described middle part holding-zone (2), be provided with resistance heater (12), it is characterized in that: on described middle part holding-zone (2), be at least provided with a set of high temperature air curtain generator (4), described high temperature air curtain generator (4) has the row's air nozzle (5) and the row's air exhaust nozzle (6) that are separately positioned on band steel (9) two sides, described air nozzle (5) and air exhaust nozzle (6) are along the even contour layout of band steel (9) width, and the output terminal of described air nozzle (5) is vertically just to being with a side of steel (9), the input terminus of described air nozzle (5) is connected with one end of circulation air path (7), the input terminus of described air exhaust nozzle (6) is vertically just to being with the another side of steel (9), and the output terminal of described air exhaust nozzle (6) is connected with the other end of circulation air path (7), on described circulation air path (7), be provided with recirculation blower (8), when described recirculation blower (8) work, can form the high temperature gas curtain (Q) perpendicular to its throughput direction in band steel (9) two sides.
7. hot-dip galvanized steel strip segmentation air sealed alloying furnace according to claim 6, it is characterized in that: described middle part holding-zone (2) is integral cavity structure, on it, be provided with two cover high temperature air curtain generators (4), a set of high temperature air curtain generator (4) is arranged on the centre of middle part holding-zone (2), and another set of high temperature air curtain generator (4) is arranged on holding-zone (2) exit, middle part.
8. hot-dip galvanized steel strip segmentation air sealed alloying furnace according to claim 6, it is characterized in that: described middle part holding-zone (2) is integral cavity structure, on it, be provided with three to quadruplet high temperature air curtain generator (4), respectively overlap high temperature air curtain generator (4) and arrange along the even interval of middle part holding-zone (2) length direction.
9. according to the hot-dip galvanized steel strip segmentation air sealed alloying furnace described in claim 6 or 7 or 8, it is characterized in that: between the outlet of described middle part holding-zone (2) and the import of top cooling section (3), be provided with turnover plate type sealing baffle (10).
10. according to the hot-dip galvanized steel strip segmentation air sealed alloying furnace described in claim 6 or 7 or 8, it is characterized in that: air nozzle (5) and the air exhaust nozzle (6) of described high temperature air curtain generator (4) are respectively provided with eight, and the output terminal of each air nozzle (5) and air exhaust nozzle (6) is flat cutter lip.
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Effective date of registration: 20170721 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |