CN104907518A - Slow-cooling temperature control device for stainless steel slabs and control method - Google Patents
Slow-cooling temperature control device for stainless steel slabs and control method Download PDFInfo
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- CN104907518A CN104907518A CN201510380142.XA CN201510380142A CN104907518A CN 104907518 A CN104907518 A CN 104907518A CN 201510380142 A CN201510380142 A CN 201510380142A CN 104907518 A CN104907518 A CN 104907518A
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Abstract
The invention pertains to the technical field of metallurgy material, in particular to a slow-cooling temperature control device for stainless steel slabs and a control method.In a slow-cooling pit, temperature in the pit changes periodically within the range from 350 to 900 DEG C. In the way that temperature of the slow-cooling pit and slow-cooling speed of slabs are controlled by recirculation furnace gas, the slabs are uniformly cooled. The slow-cooling temperature control device for the stainless steel slabs and the control method have following beneficial effects: temperature of the stainless steel slabs in the slow-cooling pit is more uniform during a cooling process; internal stress produced from a cooling process of the slabs is decreased; occurrences of stainless steel slab cracks are effectively avoided; slow-cooling time of the stainless steel slabs in the slow-cooling pit is reduced by more than 20 %; slow-cooling productivity of the slabs is improved; and purposes of uniformly decreasing temperature of the stainless steel slabs in the slow-cooling pit at the front period and the late period of the slow-cooling pit are fulfilled.
Description
Technical field
The invention belongs to metallurgical material technical field, be specifically related to a kind of stainless steel slab slow cooling temperature control equipment and control method.
Background technology
Phase transformation is there is in cooling procedure in stainless steel slab compared with carbon steel plate slab, stainless steel slab after part continuous casting needs to carry out Slow cooling, crack to avoid inside in slab phase transition process, simultaneously in stainless steel slab hot charging process, for improve slab hot charging temperature, evenly charging temperature, avoid into stove board briquette larger fluctuation, generally on rolled stainless steel production line, be provided with burial pit.In stainless steel slab production process, larger from conticaster high temperature slab out its section temperature difference after rollgang cooling, after slab loads burial pit, under the insulation effect of burial pit, its section temperature difference reduces gradually, and with the prolongation of slow cooling time, board briquette its section temperature difference in slow reduction process also reduces further.Therefore, the high temperature slab that burial pit can be used to conticaster rolls off the production line carries out insulation slow cooling, and the temperature of high temperature slab is slowly declined, and makes to keep certain temperature in slab certain hour before heating.
At present, stainless steel slab technological process of slow cooling in burial pit is: the high temperature slab sent here through ejection roller way from stainless steel conticaster, loads in burial pit carry out stacking after rolling off the production line with overhead traveling crane.The slab of stacking in burial pit according to the requirement of different steel grades, specification, quantity and temperature drop speed, by controlling body of heater radiating rate and bell open degree size, control the temperature drop speed of stacking slab, slab in burial pit through certain hour slow cooling cooling after, again by overhead traveling crane by slab from the taking-up in burial pit, slab after slow cooling, after surface quality inspection and defect reconditioning, can load in heating furnace and carry out rolling front heating.
Current domestic stainless steel slow cooling burial pit structure used is half ground type or underground type structure, the surrounding of its furnace wall is provided with refractory material and insulation material, top, hole adopts the insulation material that thermal conductivity factor is less, hole lid can move in horizontal rail, single or double dress steel can be carried out in hole, steel billet adopts stainless steel parallels technology with the contact site at the end, hole, can reduce the temperature drop speed of bottom slab.In stainless steel slab burial pit in annealing process, when slab needs to lower the temperature by certain speed, adopt the open degree controlling hole lid to control to change amount of heat with extraneous in burial pit, thus control the temperature drop speed of slab; When slab needs to carry out being incubated or heating up, the burner arranged bottom burial pit is relied on to carry out concurrent heating in burial pit.Due to the jet of burner in burial pit and combustion, a low-temperature space is formed bottom burial pit, and form a high-temperature region due to the floating of high-temperature flue gas on burial pit top, burner in combustion simultaneously, its radiant heat transfer amount of slab near flame is larger, and less away from its radiant heat transfer amount of slab of flame, thus cause the temperature of slab in annealing process uneven.Burial pit burning produce high-temperature flue gas, hole in through with slab heat exchange after, by hole top discharge flue discharge cheat outside.
At present, the subject matter that stainless steel slab exists in slow cooling in burial pit has:
(1) slab of stacking is in annealing process, upper strata board briquette declines very fast, bottom board briquette declines slower, slab corner temperature declines very fast, slab middle portion temperature declines slower, cause same buttress slab in burial pit after slow cooling, its temperature contrast of the difference of diverse location slab and same slab is larger;
(2) slab more difficult control of temperature drop speed in annealing process, slab slow cooling early stage temperature higher, the heat radiation of slab based on radiant heat transfer, temperature drop speed; And slab is lower at slow cooling latter temperature, the heat radiation of slab is that its temperature drop speed main is slow with convection heat transfer' heat-transfer by convection, causes the temperature drop speed of slab in annealing process before and after its cooling to have larger difference; Although in slab annealing process, take to carry out Control for Kiln Temperature by the aperture size of hole lid, but this method can only be applicable to could adopt when slab slow cooling later stage cooling velocity declines, and in slab slow cooling in earlier stage, when cheat lid completely close and temperature drop speed time, this method just can not control the temperature drop speed of slab;
(3) at slab in annealing process, hole in furnace gas temperature and board briquette uneven, considerable influence is had to slab slow cooling quality, slab after slow cooling is simultaneously when delivering to heating furnace and heating, because steel billet section temperature differs greatly, cause the difficulty of steel billet homogeneous heating in heating furnace, and bring certain impact to the rolling of steel billet;
(4) for martensite or ferritic stainless steel, general slab temperature in burial pit needs more than 48h from 800 ~ 900 DEG C of slow cooling to less than 350 DEG C, and simultaneously comparatively large the and crackle of the stress of slab inside easily produces.
Summary of the invention
For prior art Problems existing, the invention provides a kind of stainless steel slab slow cooling temperature control equipment and control method, object be by adopting furnace atmosphere circulation, the outer concurrent heating of burning in hole, cold wind sucks and the measure such as hole lid multiple spot exhaust, makes stainless steel slab even slow cooling improve slab quality in burial pit.
Stainless steel slab slow cooling temperature control equipment of the present invention comprises a burial pit, at burial pit peripheral hardware combuster;
Described burial pit top is provided with two symmetrical furnace gas exports, and furnace gas export connects furnace gas export pipeline, and two furnace gas outlet conduits are communicated with and share a circulation furnace gas export;
Described circulation furnace gas export is connected with heat resisting exhauster entrance by circulation furnace gas outlet conduit, the circulation furnace gas outlet conduit other end is open cold wind suction inlet, and the outlet of heat resisting exhauster is parallel with furnace gas discharge tube, high-temperature flue gas allocates pipeline into and furnace atmosphere circulation pipeline; Wherein said high-temperature flue gas is allocated the pipeline other end into and is connected with combustion chamber, described furnace atmosphere circulation pipeline one end is connected with the circulation furnace gas entrance bottom burial pit by heat resisting exhauster, and the other end is connected with the circulation furnace gas entrance of another positional symmetry bottom burial pit;
Described circulation furnace gas outlet conduit, furnace gas discharge tube and high-temperature flue gas are allocated on pipeline and are all provided with control valve.
Described combustion chamber is also provided with fuel inlet and combustion air inlet.
Described burial pit top is provided with hole lid, and described hole lid is made up of 3 ~ 4 pitting lids, and the spacing of adjacent two pitting lids is adjustable, and the hole portion of covering is provided with furnace gas gathering-device.
Said apparatus is adopted to carry out according to following steps the temperature controlled method of stainless steel slab slow cooling:
(1) start heat resisting exhauster and extract furnace gas from the furnace gas export pipeline at burial pit top, controlling furnace gas temperature by cold wind suction inlet and control valve is 450 ~ 500 DEG C, furnace gas again blasts in burial pit from the circulation furnace gas entrance of burial pit two bottom sides after heat resisting exhauster pressurization, and the flow velocity of controlled circulation furnace gas is 35 ~ 75m/s;
(2) the high temperature board briquette pulled out from stainless steel conticaster is 800 ~ 900 DEG C, loaded in burial pit, hole lid on bonnet filled by slab, in the high temperature slow cooling stage of slab, allocating by high-temperature flue gas the high-temperature flue gas that the burning of burial pit exterior combustion chamber produces into pipeline is passed in burial pit, regulate the ratio of high-temperature flue gas and circulation furnace gas, the cooling velocity controlling slab is 50 ~ 60 DEG C/h;
(3) when board briquette is down to 600 DEG C, enter the low temperature slow cooling stage, open control valve, air is sucked by cold wind suction inlet, by furnace gas discharge tube discharge section furnace gas, reduce circulation furnace gas temperature, regulate the ratio of circulatory stove tolerance, cold wind soakage and furnace gas discharge capacity, the cooling velocity controlling slab is 15-30 DEG C/h
(4) stainless steel slab is in burial pit after 24 ~ 46h slow cooling, and final temperature is down to 350 DEG C, stops furnace atmosphere circulation, furnace gas is discharged from lid gap, hole, enters furnace gas gathering-device, opens the hole lid of burial pit, from burial pit, take out slab, deliver to next process and proceed processing.
Gap between described burial pit lid can regulate in annealing process, and then the air flow method at each position in adjustment burial pit, make homogeneous temperature in slab annealing process.
Compared with prior art, feature of the present invention and beneficial effect are:
Of the present invention reduce slab in burial pit slow cooling early stage, namely the high temperature slow cooling stage cooling velocity and improve the cooling velocity of slab in the sub-cooled stage, concrete principle is:
Burial pit of the present invention is the equipment of the charging of a kind of periodicity and periodically discharging, temperature cyclically-varying between 350 ~ 900 DEG C in whole production process in hole, in the high temperature slow cooling stage in slab cooling early stage, the temperature of slab is 800 ~ 900 DEG C, its heat loss through radiation amount is comparatively large and temperature decrease speed is very fast, heat due to stainless steel slab inside outwards transmits and needs the regular hour, steel slab surface faster temperature drop speed easily produces the phenomenon of internal and external temperature inequality, generally need the cooling velocity reducing slab, controlling its temperature drop speed is 500 ~ 600 DEG C/h, the present invention arranges fuel combustion chamber outside burial pit, burn in combustion chamber after fuel mixes with combustion air, high-temperature flue gas after burning is passed in burial pit, the furnace gas temperature entered in burial pit is controlled by the ratio controlling high-temperature flue gas and circulation furnace gas, effectively can adjust the cooling velocity in slab slow cooling early stage,
When board briquette is lower than 600 DEG C, slab is in the low temperature slow cooling stage in slow cooling later stage in burial pit, its radiant heat transfer amount is less and convection heat transfer' heat-transfer by convection amount is larger, cause that the heat dissipation capacity of slab is less and temperature drop speed is slower, board briquette is reduced to less than 350 DEG C needs the longer time, affect the output increased of slab slow cooling, therefore the cooling velocity improving slab is needed, specifically in furnace atmosphere circulation process, by carrying out the discharge of part furnace gas at heat resisting exhauster porch suction part cold air and heat resisting exhauster exit, the temperature of effective reduction circulation furnace gas, by circulatory stove tolerance, cold wind soakage, the ratio adjustment of furnace gas discharge capacity, effect controls the furnace gas temperature passing into the end, hole, thus improve the cooling velocity of slab in the slow cooling later stage.
The present invention can not only regulate the slow cooling speed of stainless steel slab, the homogeneous temperature of slab in burial pit can also be made, specifically adopt the furnace atmosphere circulation method of atm number, furnace gas is blasted with 35 ~ 75m/s flow velocity in the width direction from both sides, the end, hole, the furnace gas blasted mutually produces interference in the flat flow process of underground water, add the heat exchange amount between furnace gas and slab, extract furnace gas out from lid both sides, hole simultaneously, the flowing of each region furnace gas in burial pit can be strengthened, make each board briquette in burial pit keep evenly, in addition the problem of the burial pit upper air skewness produced in time bleeding in both sides is pushed up in order to solve hole, the hole lid of burial pit is arranged to 3 ~ 4 pitting lids, can close between adjacent two pitting lids and also can leave gap, when adjacent two pitting lids are closed, slab central upper portion region can be formed in " dead band " of furnace gas flowing, when leaving gap between adjacent two pitting lids, part furnace gas in hole flows out from the gap between the lid of hole, by adjusting the gap between adjacent two pitting lids, effectively can adjust the air flow method at each position in hole, thus make equalizing temperature in slab annealing process, the furnace atmosphere circulation flow field problem of central area, top, hole can also be solved.
The principle that the present invention arranges combustion chamber outside burial pit is: in order to control the cooling rate of stainless steel slab in slow cooling early stage, by arranging fuel combustion chamber outside burial pit, burn in combustion chamber after fuel mixes with combustion air, high-temperature flue gas after burning is passed in burial pit, the furnace gas temperature entered in burial pit is controlled by the ratio controlling high-temperature flue gas and circulation furnace gas, effectively can adjust the cooling velocity in slab slow cooling early stage, the setting of burial pit exterior combustion chamber simultaneously, avoid the radiant heat transfer of fuel flame and high-temperature furnace gas when burial pit combustion to the impact of board briquette uniformity, improve the slow cooling quality of slab.
Because its temperature in the furnace gas of discharging from burial pit pitting lid gap is higher simultaneously containing certain dust, directly can not enter air, the gathering-device of invention by arranging furnace gas on burial pit top, makes furnace gas by after dust arrester dedusting, then enters air by air exhauster.
The heat resisting exhauster that the present invention uses in furnace atmosphere circulation device, the highest control of its entrance furnace gas temperature is 450 ~ 500 DEG C, when heat resisting exhauster entrance furnace gas temperature is higher, the cold wind suction inlet connected by heat resisting exhauster inlet tube sucks air, or the furnace gas floss hole exported by heat resisting exhauster discharges a part of furnace gas, reduces the furnace gas temperature of heat resisting exhauster entrance.
The present invention make stainless steel slab in burial pit in cooling procedure temperature more even, reduce the internal stress produced in slab cooling procedure, effectively prevent the generation of stainless steel slab crack defect;
In the inventive method, stainless steel slab slow cooling time shorten more than 20% in burial pit, improves the productivity ratio of slab slow cooling;
Present invention achieves the stainless steel slab object that slow cooling early stage and slow cooling latter temperature evenly decline in burial pit.
Accompanying drawing explanation
Fig. 1 is stainless steel slab slow cooling temperature control equipment schematic diagram of the present invention;
Wherein: 1: burial pit; 2: furnace gas export pipeline; 3: circulation furnace gas outlet conduit; 4: heat resisting exhauster; 5: furnace gas discharge tube; 6: high-temperature flue gas allocates pipeline into; 7: furnace atmosphere circulation pipeline; 8: combustion chamber; 9: combustion air inlet; 10: fuel inlet; 11: hole lid; 12: furnace gas gathering-device; 13: cold wind suction inlet; 14: control valve;
Wherein → represent furnace gas flow direction;
Fig. 2 is stainless steel slab slow cooling temperature-controlled process flow chart of the present invention.
Detailed description of the invention
The stainless steel slab slow cooling temperature control equipment of the present embodiment as shown in Figure 1,
Stainless steel slab slow cooling temperature control equipment of the present invention comprises a slow cooling 1, at burial pit peripheral hardware combuster 8;
Described burial pit 1 top is provided with two symmetrical furnace gas exports, and furnace gas export connects furnace gas export pipeline 2, two furnace gas outlet conduits 2 and is communicated with and shares a circulation furnace gas export;
Described circulation furnace gas export is connected with heat resisting exhauster 4 entrance by circulation furnace gas outlet conduit 3, circulation furnace gas outlet 4 other end is open cold wind suction inlet 13, and the outlet of heat resisting exhauster 4 is parallel with furnace gas delivery pipe 5, high-temperature flue gas allocates pipeline 6 into and furnace atmosphere circulation pipeline 7; Wherein said high-temperature flue gas is allocated pipeline 6 other end into and is connected with burning 8, described furnace atmosphere circulation pipeline 7 one end is connected with the circulation furnace gas entrance bottom burial pit 1 by heat resisting exhauster 4, and the other end is connected with the circulation furnace gas entrance of another positional symmetry bottom burial pit 1;
Described circulation furnace gas outlet conduit 3, furnace gas discharge tube 5 and high-temperature flue gas are allocated on pipeline 6 and are all provided with control valve 14.
Described combustion chamber 8 is also provided with fuel inlet 10 and combustion air inlet 9.
Described burial pit 1 top is provided with hole 11, and described hole lid 11 is made up of 3 ~ 4 pitting lids, and the spacing of adjacent two pitting lids is adjustable, and the hole portion of covering is provided with furnace gas gathering-device 12.
In the burial pit of the embodiment of the present invention, stacking singly piles up neatly slab, slab stacking quantity 10 ~ 12 pieces, stacking height 2 ~ 2.5m, load temperature 800 ~ 900 DEG C, monolithic slab specification (5000 ~ 12000) mm × (800 ~ 1250) mm × (160 ~ 220) mm, adopting steel grade to be martensite or ferritic stainless steel is that example is described, and as shown in Fig. 2 flow process, the method that slab slow cooling controls is carried out according to following steps:
(1) start heat resisting exhauster and extract furnace gas from the furnace gas export pipeline at burial pit top, controlling furnace gas temperature by cold wind suction inlet and control valve is 450 ~ 500 DEG C, furnace gas again blasts in burial pit from the circulation furnace gas entrance of burial pit two bottom sides after heat resisting exhauster pressurization, and the flow velocity of controlled circulation furnace gas is 35 ~ 75m/s;
(2) the high temperature board briquette pulled out from stainless steel conticaster is 800 ~ 900 DEG C, loaded in burial pit, hole lid on bonnet filled by slab, in the high temperature slow cooling stage of slab, allocating by high-temperature flue gas the high-temperature flue gas that the burning of burial pit exterior combustion chamber produces into pipeline is passed in burial pit, regulate the ratio of high-temperature flue gas and circulation furnace gas, the cooling velocity controlling slab is 50 ~ 60 DEG C/h;
(3) when board briquette is down to 600 DEG C, enter the low temperature slow cooling stage, open control valve, air is sucked by cold wind suction inlet, by furnace gas discharge tube discharge section furnace gas, reduce circulation furnace gas temperature, regulate the ratio of circulatory stove tolerance, cold wind soakage and furnace gas discharge capacity, the cooling velocity controlling slab is 15-30 DEG C/h
(4) stainless steel slab is in burial pit after 24 ~ 46h slow cooling, and final temperature is down to 350 DEG C, stops furnace atmosphere circulation, furnace gas is discharged from lid gap, hole, enters furnace gas gathering-device, opens the hole lid of burial pit, from burial pit, take out slab, deliver to next process and proceed processing.
By regulating the gap between burial pit lid in whole annealing process, and then adjusting the air flow method at each position in burial pit, making homogeneous temperature in slab annealing process.
Claims (5)
1. stainless steel slab slow cooling temperature control equipment comprises a burial pit, it is characterized in that at burial pit peripheral hardware combuster; Described burial pit top is provided with two symmetrical furnace gas exports, and furnace gas export connects furnace gas export pipeline, and two furnace gas outlet conduits are communicated with and share a circulation furnace gas export;
Described circulation furnace gas export is connected with heat resisting exhauster entrance by circulation furnace gas outlet conduit, the circulation furnace gas outlet conduit other end is open cold wind suction inlet, and the outlet of heat resisting exhauster is parallel with furnace gas discharge tube, high-temperature flue gas allocates pipeline into and furnace atmosphere circulation pipeline; Wherein said high-temperature flue gas is allocated the pipeline other end into and is connected with combustion chamber, described furnace atmosphere circulation pipeline one end is connected with the circulation furnace gas entrance bottom burial pit by heat resisting exhauster, and the other end is connected with the circulation furnace gas entrance of another positional symmetry bottom burial pit;
Described circulation furnace gas outlet conduit, furnace gas discharge tube and high-temperature flue gas are allocated on pipeline and are all provided with control valve.
2. a kind of stainless steel slab slow cooling temperature control equipment according to claim 1, is characterized in that described combustion chamber is also provided with fuel inlet and combustion air inlet.
3. a kind of stainless steel slab slow cooling temperature control equipment according to claim 1, it is characterized in that described burial pit top is provided with hole lid, described hole lid is made up of 3 ~ 4 pitting lids, and the spacing of adjacent two pitting lids is adjustable, and the hole portion of covering is provided with furnace gas gathering-device.
4. adopt device as claimed in claim 1 to the temperature controlled method of stainless steel slab slow cooling, it is characterized in that carrying out according to following steps:
(1) start heat resisting exhauster and extract furnace gas from the furnace gas export pipeline at burial pit top, controlling furnace gas temperature by cold wind suction inlet and control valve is 450 ~ 500 DEG C, furnace gas again blasts in burial pit from the circulation furnace gas entrance of burial pit two bottom sides after heat resisting exhauster pressurization, and the flow velocity of controlled circulation furnace gas is 35 ~ 75m/s;
(2) the high temperature board briquette pulled out from stainless steel conticaster is 800 ~ 900 DEG C, loaded in burial pit, hole lid on bonnet filled by slab, in the high temperature slow cooling stage of slab, allocating by high-temperature flue gas the high-temperature flue gas that the burning of burial pit exterior combustion chamber produces into pipeline is passed in burial pit, regulate the ratio of high-temperature flue gas and circulation furnace gas, the cooling velocity controlling slab is 50 ~ 60 DEG C/h;
(3) when board briquette is down to 600 DEG C, enter the low temperature slow cooling stage, open control valve, air is sucked by cold wind suction inlet, by furnace gas discharge tube discharge section furnace gas, reduce circulation furnace gas temperature, regulate the ratio of circulatory stove tolerance, cold wind soakage and furnace gas discharge capacity, the cooling velocity controlling slab is 15-30 DEG C/h
(4) stainless steel slab is in burial pit after 24 ~ 46h slow cooling, and final temperature is down to 350 DEG C, stops furnace atmosphere circulation, furnace gas is discharged from lid gap, hole, enters furnace gas gathering-device, opens the hole lid of burial pit, from burial pit, take out slab, deliver to next process and proceed processing.
5. a kind of stainless steel slab slow cooling temperature-controlled process according to claim 4, it is characterized in that the gap between described burial pit lid can regulate in annealing process, and then the air flow method at each position in adjustment burial pit, make homogeneous temperature in slab annealing process.
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| CN112008498A (en) * | 2019-05-28 | 2020-12-01 | 宝山钢铁股份有限公司 | Method for eliminating surface defects of medium-high carbon martensitic stainless steel continuous casting blank |
| CN113084134A (en) * | 2021-02-22 | 2021-07-09 | 山东中天重工有限公司 | Novel high-chromium ball casting equipment device |
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