CN104907518B - A kind of stainless steel slab slow cooling temperature control equipment and control method - Google Patents
A kind of stainless steel slab slow cooling temperature control equipment and control method Download PDFInfo
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- CN104907518B CN104907518B CN201510380142.XA CN201510380142A CN104907518B CN 104907518 B CN104907518 B CN 104907518B CN 201510380142 A CN201510380142 A CN 201510380142A CN 104907518 B CN104907518 B CN 104907518B
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Abstract
The invention belongs to metallurgical material technical field, and in particular to a kind of stainless steel slab slow cooling temperature control equipment and control method.Temperature cyclically-varying between 350~900 DEG C in the burial pit of the present invention in hole, by the temperature and the slow cooling speed of slab of circulatory stove gas control burial pit, and makes slab cooling uniform.The present invention makes stainless steel slab, and temperature is more uniform in cooling procedure in burial pit, internal stress produced by reducing in slab cooling procedure, it effectively prevent the generation of stainless steel slab crack defect, stainless steel slab temperature retention time in burial pit shortens more than 20%, the productivity ratio of slab slow cooling is improved, the present invention realizes the stainless steel slab purpose that slow cooling early stage and slow cooling latter temperature uniformly decline in burial pit.
Description
Technical field
The invention belongs to metallurgical material technical field, and in particular to a kind of stainless steel slab slow cooling temperature control equipment and control
Method processed.
Background technology
Stainless steel slab of the stainless steel slab compared with carbon steel plate slab after cooling procedure has phase transformation, part continuous casting needs
Slow cooling is carried out, to avoid inside in slab phase transition process from cracking, while during stainless steel slab hot charging, to carry
The hot charging temperature of high slab, uniform charging temperature, larger fluctuation into stove board briquette is avoided, typically produced in rolled stainless steel
Line is provided with burial pit.In stainless steel slab production process, after the high temperature slab come out from conticaster is cooled down through rollgang
Its section temperature difference is larger, and after slab loads burial pit, under the insulation effect of burial pit, its section temperature difference is gradually reduced, and
With the extension of temperature retention time, board briquette its section temperature difference during slow reduction also further reduces.Therefore, burial pit can
For carrying out insulation slow cooling to the offline high temperature slab of conticaster, the temperature of high temperature slab is set slowly to decline, and adding slab
Certain temperature is kept in certain time before heat.
At present, stainless steel slab technological process of slow cooling in burial pit is：Sent from stainless steel conticaster through ejection roller way
Come high temperature slab, it is offline after with overhead traveling crane load burial pit in carry out stacking.The slab of stacking is in burial pit according to different
Steel grade, specification, the requirement of quantity and temperature drop speed, by controlling body of heater radiating rate and bell open degree size, to control heap
The temperature drop speed of pile slab, slab in burial pit after certain time slow cooling cooling, then by overhead traveling crane by slab from slow cooling
Taking-up in hole, the slab after slow cooling can load before being rolled in heating furnace and add after surface quality inspection and defect reconditioning
Heat.
Burial pit structure used in country's stainless steel slow cooling at present is half ground type or underground type structure, the surrounding of its furnace wall
Provided with refractory material and insulation material, hole top uses the less insulation material of thermal conductivity factor, and hole lid can be moved in horizontal rail,
Single or double steel loading can be carried out in hole, steel billet and the contact site at hole bottom use stainless steel parallels technology, it is possible to decrease bottom plate
The temperature drop speed of base.In stainless steel slab burial pit in annealing process, when slab needs to be cooled by certain speed,
Heat exchange amount size in burial pit and extraneous is controlled using the open degree of control hole lid, so as to control the temperature drop speed of slab；
When slab needs to be incubated or heated up, the burner set by burial pit bottom carries out concurrent heating into burial pit.Due to burning
Jet and combustion of the mouth in burial pit, a low-temperature space is formed in burial pit bottom, and on burial pit top due to height
The floating of warm flue gas and form a high-temperature region, while burner is in combustion, close to its radiant heat transfer amount of the slab of flame
It is larger, and its radiant heat transfer amount is smaller away from the slab of flame, so as to cause temperature of the slab in annealing process uneven.Slow cooling
The high-temperature flue gas that hole burning is produced, it is outer by the discharge flue discharge hole for cheating top in hole after being exchanged heat with slab.
At present, stainless steel slab subject matter present in slow cooling in burial pit has：
（1）The slab of stacking is in annealing process, and upper strata slab temperature drop is very fast, and bottom slab temperature drop is slower,
The temperature drop of slab corner is very fast, and the decline of slab middle portion temperature is slower, causes same pile slab in burial pit after slow cooling, different
Its temperature difference of the difference of position slab and same slab is larger；
（2）The more difficult control of slab temperature drop speed in annealing process, slab is higher in slow cooling early stage temperature, the radiating of slab
Based on radiant heat transfer, temperature drop speed；And slab is relatively low in slow cooling latter temperature, the radiating of slab is based on convection heat transfer' heat-transfer by convection
Its temperature drop speed is slow, causes temperature drop speed of the slab in annealing process before and after its cooling to have larger difference；Although slow in slab
During cold, the aperture size for being taken through hole lid carries out Control for Kiln Temperature, but this method may be only available for the slab slow cooling later stage
Cooling velocity could be used when declining, and in slab slow cooling early stage, be completely closed and during temperature drop speed when cheating lid, this side
Method cannot control the temperature drop speed of slab；
（3）In slab in annealing process, hole in furnace gas temperature and board briquette it is uneven, have to slab slow cooling quality compared with
Big influence, while slab after slow cooling, because steel billet section temperature differs greatly, causes steel when being sent to heating furnace and being heated
The difficulty that base is uniformly heated in heating furnace, and carry out certain influence to the rolled bands of steel billet；
（4）For martensite or ferritic stainless steel, general slab temperature in burial pit is slow from 800~900 DEG C
Being as cold as less than 350 DEG C needs more than 48h, while the stress inside slab is larger and crackle is easily produced.
The content of the invention
The problem of existing for prior art, the present invention provides a kind of stainless steel slab slow cooling temperature control equipment and control
Method, it is therefore an objective to suck and cheat the measures such as lid multiple spot exhaust by using furnace atmosphere circulation, the outer burning concurrent heating in hole, cold wind, make stainless
Plate slab uniform slow cooling and improves slab quality in burial pit.
The stainless steel slab slow cooling temperature control equipment of the present invention includes a burial pit, and burning is externally provided with burial pit
Room；
Described burial pit top is provided with two symmetrical furnace gas exports, furnace gas export connection furnace gas export pipeline, two
Furnace gas export pipeline communication simultaneously shares a circulation furnace gas export；
Described circulation furnace gas export is connected by circulating furnace gas outlet conduit with heat resisting exhauster entrance, circulates furnace gas export
The pipeline 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 supplying pipe
Road and furnace atmosphere circulation pipeline；The wherein described high-temperature flue gas supplying pipeline other end is connected with combustion chamber, described furnace atmosphere circulation
Pipeline one end is connected by heat resisting exhauster with the circulation furnace gas entrance of burial pit bottom, the other end and another position of burial pit bottom
Symmetrical circulation furnace gas entrance is put to be connected；
Regulating valve is designed with described circulation furnace gas outlet conduit, furnace gas discharge tube and high-temperature flue gas supplying pipeline
Door.
Described combustion chamber is additionally provided with fuel inlet and combustion air inlet.
Provided with hole lid at the top of described burial pit, described hole lid is made up of 3~4 pitting lids, two neighboring small
Distance can adjust between the lid of hole, and the hole portion of covering is provided with furnace gas collection device.
The temperature controlled method of stainless steel slab slow cooling is followed the steps below using said apparatus：
（1）Start heat resisting exhauster and extract furnace gas from the furnace gas export pipeline at the top of burial pit, pass through cold wind suction inlet and tune
It is 450 ~ 500 DEG C to save Valve controlling furnace gas temperature, furnace gas pressurizeed through heat resisting exhauster after from the circulation furnace gases of burial pit two bottom sides
Entrance is blasted in burial pit again, and the flow velocity for controlling to circulate furnace gas is 35 ~ 75m/s；
（2）The high temperature board briquette pulled out from stainless steel conticaster is 800 ~ 900 DEG C, is loaded into burial pit, slab
Hole lid is covered after filling, in the high temperature slow cooling stage of slab, the high-temperature flue gas produced that burial pit exterior combustion chamber is burnt passes through height
Warm flue gas supplying pipeline is passed into burial pit, and the ratio of regulation high-temperature flue gas and circulation furnace gas controls the cooling velocity of slab
For 50~60 DEG C/h；
（3）When board briquette is down to 600 DEG C, into the low temperature slow cooling stage, control valve is opened, is inhaled by cold wind suction inlet
Enter air, pass through furnace gas discharge tube discharge part furnace gas, reduction circulation furnace gas temperature, regulation circulatory stove tolerance, cold wind suction
The ratio of amount and furnace gas discharge capacity, the cooling velocity for 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 gas and follows
Ring, furnace gas is discharged from the lid gap of hole, into furnace gas collection device, opens the hole lid of burial pit, slab is taken out from burial pit,
Deliver to next process and proceed processing.
Gap between described burial pit lid can be adjusted in annealing process, and then adjust each position in burial pit
Air flow method, makes temperature in slab annealing process uniform.
Compared with prior art, the features of the present invention and beneficial effect are：
The present invention's reduces slab slow cooling early stage in burial pit, the i.e. cooling velocity in high temperature slow cooling stage and improves
Cooling velocity of the slab in the sub-cooled stage, concrete principle is：
The burial pit of the present invention is the equipment that a kind of periodicity feeds and periodically discharged, and cheats interior in whole production process
Temperature cyclically-varying between 350~900 DEG C, cool down the high temperature slow cooling stage of early stage in slab, the temperature of slab is
800~900 DEG C, its heat loss through radiation amount is larger and temperature drop rate very fast, because the heat inside stainless steel slab is to unofficial biography
Passing needs the regular hour, and the faster temperature drop speed of steel slab surface easily produces the uneven phenomenon of internal and external temperature, generally requires drop
The cooling velocity of low slab, it is 500~600 DEG C/h to control its temperature drop speed, and the present invention sets fuel combustion chamber outside burial pit,
Fuel is burnt after being mixed with combustion air in combustion chamber, and the high-temperature flue gas after burning is passed into burial pit, passes through control
Preparing high-temp flue gas controls to enter the furnace gas temperature in burial pit with the ratio of circulation furnace gas, can effectively adjust slab slow cooling
The cooling velocity of early stage；
When board briquette is less than 600 DEG C, slab is in the low temperature slow cooling stage in slow cooling later stage in burial pit, and it is radiated
Heat output is smaller and convection heat transfer' heat-transfer by convection amount is larger, causes the heat dissipation capacity of slab smaller and temperature drop speed is slower, board briquette is reduced to
Less than 350 DEG C need longer time, influence the output increased of slab slow cooling, it is therefore desirable to improve the cooling velocity of slab, have
Body is during furnace atmosphere circulation, by heat resisting exhauster porch suction part cold air and heat resisting exhauster exit carry out portion
Divide the temperature of furnace gas discharge, effectively reduction circulation furnace gas, pass through circulatory stove tolerance, cold wind soakage, the ratio of furnace gas discharge capacity
Adjustment, effect control is passed through the furnace gas temperature at hole bottom, so as to improve cooling velocity of the slab in the slow cooling later stage.
The present invention can not only adjust the slow cooling speed of stainless steel slab, additionally it is possible to make the temperature of slab in burial pit equal
It is even, specifically using the furnace atmosphere circulation method of atm number, furnace gas is entered in the width direction with 35~75m/s flow velocitys from hole bottom both sides
Row is blasted, and the furnace gas blasted mutually produces interference during underground water advection is dynamic, adds the heat exchange between furnace gas and slab
Amount, while extracting furnace gas out from hole lid both sides, can strengthen the flowing of each region furnace gas in burial pit, make each slab temperature in burial pit
Degree keeps uniform；In addition in order to solve hole top along both sides be evacuated when produced burial pit upper air skewness the problem of,
The hole lid of burial pit, which is arranged to close between 3~4 pitting lids, two neighboring pitting lid, can also leave gap, work as phase
When adjacent two pitting lids are closed, slab central upper portion region can form " dead band " of furnace gas flowing, when two neighboring pitting lid it
Between when leaving gap, part furnace gas in hole is from the gap outflow between the lid of hole, by adjusting between two neighboring pitting lid
Gap, can effectively adjust the air flow method at each position in hole, so that equalizing temperature in slab annealing process, additionally it is possible to solve
The furnace atmosphere circulation flow field problem of hole top central area.
The present invention outside burial pit set combustion chamber principle be：In order to control stainless steel slab in the cooling of slow cooling early stage
Speed, is burnt after being mixed with combustion air by setting fuel combustion chamber, fuel outside burial pit in combustion chamber, is burnt
High-temperature flue gas afterwards is passed into burial pit, controls to enter burial pit by controlling high-temperature flue gas with the ratio of circulation furnace gas
Interior furnace gas temperature, can effectively adjust the cooling velocity of slab slow cooling early stage, while the setting of burial pit exterior combustion chamber, it is to avoid
Influence of the radiant heat transfer of flame and high-temperature furnace gas to board briquette uniformity, improves slab when fuel burns in burial pit
Slow cooling quality.
Contain certain dust simultaneously because its temperature is higher in the furnace gas discharged from burial pit pitting lid gap, it is impossible to straight
Run in into air, invention is by the collection device in burial pit top setting furnace gas, after making furnace gas by dust arrester dedusting, then
Air is discharged into by air exhauster.
The heat resisting exhauster that the present invention is used in furnace atmosphere circulation device, its entrance furnace gas temperature highest control 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 that person is exported by heat resisting exhauster discharges a part of furnace gas, to reduce the furnace gas temperature of heat resisting exhauster entrance.
The present invention makes stainless steel slab, and temperature is more uniform in cooling procedure in burial pit, reduces slab cooling procedure
In produced by internal stress, effectively prevent the generation of stainless steel slab crack defect；
Stainless steel slab temperature retention time in burial pit shortens more than 20% in the inventive method, improves slab slow cooling
Productivity ratio；
The present invention realizes the stainless steel slab purpose that slow cooling early stage and slow cooling latter temperature uniformly decline in burial pit.
Brief description of the drawings
Fig. 1 is the stainless steel slab slow cooling temperature control equipment schematic diagram of the present invention；
Wherein：1：Burial pit；2：Furnace gas export pipeline；3：Circulate furnace gas outlet conduit；4：Heat resisting exhauster；5：Furnace gas is discharged
Pipeline；6：High-temperature flue gas is incorporated pipeline；7：Furnace atmosphere circulation pipeline；8：Combustion chamber；9：Combustion air inlet；10：Fuel inlet；
11：Hole lid；12：Furnace gas collection device；13：Cold wind suction inlet；14：Control valve；
It is therein → to represent furnace gas flow direction；
Fig. 2 is the stainless steel slab slow cooling temprature control method flow chart of the present invention.
Embodiment
The stainless steel slab slow cooling temperature control equipment of the present embodiment as shown in figure 1,
The stainless steel slab slow cooling temperature control equipment of the present invention includes a slow cooling 1, in burial pit peripheral hardware combuster
8；
The described top of burial pit 1 is provided with two symmetrical furnace gas exports, furnace gas export connection furnace gas export pipeline 2, two
Bar furnace gas outlet conduit 2 connects and shares a circulation furnace gas export；
Described circulation furnace gas export is connected by circulating furnace gas outlet conduit 3 with the entrance of heat resisting exhauster 4, and circulation furnace gas goes out
The mouth other end of pipe 4 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 supplying
Pipeline 6 and furnace atmosphere circulation pipeline 7；The wherein described high-temperature flue gas supplying other end of pipeline 6 is connected with burning 8, described furnace gas
The one end of circulating line 7 is connected by heat resisting exhauster 4 with the circulation furnace gas entrance of the bottom of burial pit 1, the other end and the bottom of burial pit 1
The circulation furnace gas entrance of another positional symmetry is connected；
Regulation is designed with described circulation furnace gas outlet conduit 3, furnace gas discharge tube 5 and high-temperature flue gas supplying pipeline 6
Valve 14.
Described combustion chamber 8 is additionally provided with fuel inlet 10 and combustion air inlet 9.
The described top of burial pit 1 is provided with hole 11, and described hole lid 11 is made up of 3~4 pitting lids, two neighboring
Distance can adjust between pitting lid, and the hole portion of covering is provided with furnace gas collection device 12.
The single pile slab of stacking in the burial pit of the embodiment of the present invention, 10~12 pieces of slab stacking quantity, stacking height 2~
2.5m, loads 800~900 DEG C of temperature, monolithic slab specification（5000~12000）mm×（800~1250）mm×（160~
220）Mm, is illustrated exemplified by using steel grade for martensite or ferritic stainless steel, as shown in Fig. 2 flows, slab slow cooling control
Method follow the steps below：
（1）Start heat resisting exhauster and extract furnace gas from the furnace gas export pipeline at the top of burial pit, pass through cold wind suction inlet and tune
It is 450 ~ 500 DEG C to save Valve controlling furnace gas temperature, furnace gas pressurizeed through heat resisting exhauster after from the circulation furnace gases of burial pit two bottom sides
Entrance is blasted in burial pit again, and the flow velocity for controlling to circulate furnace gas is 35 ~ 75m/s；
（2）The high temperature board briquette pulled out from stainless steel conticaster is 800 ~ 900 DEG C, is loaded into burial pit, slab
Hole lid is covered after filling, in the high temperature slow cooling stage of slab, the high-temperature flue gas produced that burial pit exterior combustion chamber is burnt passes through height
Warm flue gas supplying pipeline is passed into burial pit, and the ratio of regulation high-temperature flue gas and circulation furnace gas controls the cooling velocity of slab
For 50~60 DEG C/h；
（3）When board briquette is down to 600 DEG C, into the low temperature slow cooling stage, control valve is opened, is inhaled by cold wind suction inlet
Enter air, pass through furnace gas discharge tube discharge part furnace gas, reduction circulation furnace gas temperature, regulation circulatory stove tolerance, cold wind suction
The ratio of amount and furnace gas discharge capacity, the cooling velocity for 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 gas and follows
Ring, furnace gas is discharged from the lid gap of hole, into furnace gas collection device, opens the hole lid of burial pit, slab is taken out from burial pit,
Deliver to next process and proceed processing.
By adjusting the gap between burial pit lid in whole annealing process, and then adjust the gas at each position in burial pit
Flow distribution, makes temperature in slab annealing process uniform.
Claims (4)
1. a kind of stainless steel slab slow cooling temperature control equipment, including a burial pit, it is characterised in that be externally provided with burial pit
Combustion chamber；Described burial pit top is provided with two symmetrical furnace gas exports, furnace gas export connection furnace gas export pipeline, two bar ovens
Gas outlet conduit connects and shares a circulation furnace gas export；
Described circulation furnace gas export is connected by circulating furnace gas outlet conduit with heat resisting exhauster entrance, circulates furnace gas outlet conduit
The other end is open cold wind suction inlet, the outlet of heat resisting exhauster be parallel with furnace gas discharge tube, high-temperature flue gas supplying pipeline and
Furnace atmosphere circulation pipeline；The wherein described high-temperature flue gas supplying pipeline other end is connected with combustion chamber, described furnace atmosphere circulation pipeline
One end is connected by heat resisting exhauster with the circulation furnace gas entrance of burial pit bottom, the other end and another position pair of burial pit bottom
The circulation furnace gas entrance of title is connected；
Control valve is designed with described circulation furnace gas outlet conduit, furnace gas discharge tube and high-temperature flue gas supplying pipeline；
Provided with hole lid at the top of described burial pit, described hole lid is made up of 3~4 pitting lids, two neighboring pitting lid
Between distance can adjust, the hole portion of covering is provided with furnace gas collection device.
2. a kind of stainless steel slab slow cooling temperature control equipment according to claim 1, it is characterised in that described burning
Room is additionally provided with fuel inlet and combustion air inlet.
3. using device as claimed in claim 1 to the temperature controlled method of stainless steel slab slow cooling, it is characterised in that according to
Following steps are carried out：
（1）Start heat resisting exhauster and extract furnace gas from the furnace gas export pipeline at the top of burial pit, pass through cold wind suction inlet and regulating valve
Gate control furnace gas temperature is 450 ~ 500 DEG C, furnace gas pressurizeed through heat resisting exhauster after from the circulation furnace gas entrances of burial pit two bottom sides
Again blast in burial pit, the flow velocity for controlling to circulate furnace gas is 35 ~ 75m/s；
（2）The high temperature board briquette pulled out from stainless steel conticaster is 800 ~ 900 DEG C, is loaded into burial pit, slab is filled
After cover hole lid, in the high temperature slow cooling stage of slab, the high-temperature flue gas produced that burial pit exterior combustion chamber is burnt passes through high temperature cigarette
Gas supplying pipeline is passed into burial pit, and the ratio of regulation high-temperature flue gas and circulation furnace gas, the cooling velocity for controlling slab is 50
~60 DEG C/h；
（3）When board briquette is down to 600 DEG C, into the low temperature slow cooling stage, control valve is opened, is sucked by cold wind suction inlet empty
Gas, by furnace gas discharge tube discharge part furnace gas, reduction circulation furnace gas temperature, regulation circulatory stove tolerance, cold wind soakage and
The ratio of furnace gas discharge capacity, the cooling velocity for 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 the lid gap of hole, into furnace gas collection device, opens the hole lid of burial pit, slab is taken out from burial pit, is sent
Proceed processing to next process.
4. a kind of stainless steel slab slow cooling temprature control method according to claim 3, it is characterised in that described slow cooling
Gap between the lid of hole can be adjusted in annealing process, and then adjust the air flow method at each position in burial pit, delay slab
Temperature is uniform during cold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510380142.XA CN104907518B (en) | 2015-07-02 | 2015-07-02 | A kind of stainless steel slab slow cooling temperature control equipment and control method |
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| CN201510380142.XA CN104907518B (en) | 2015-07-02 | 2015-07-02 | A kind of stainless steel slab slow cooling temperature control equipment and control method |
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| CN104907518B true CN104907518B (en) | 2017-09-05 |
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| CN112008498B (en) * | 2019-05-28 | 2021-11-16 | 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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| JP4690995B2 (en) * | 2006-10-18 | 2011-06-01 | 新日本製鐵株式会社 | Steel continuous casting method and continuous casting equipment |
| CN102286655B (en) * | 2011-08-09 | 2013-06-12 | 浙江万能达炉业有限公司 | Device and method for isothermal normalizing utilizing forging waste heat |
| CN202246747U (en) * | 2011-08-09 | 2012-05-30 | 浙江万能达炉业有限公司 | Excess heat isothermal normalizing furnace |
| CN102374788B (en) * | 2011-10-24 | 2013-10-16 | 广东摩德娜科技股份有限公司 | Furnace slow-cooling area structure capable of shrinking cross-sectional temperature difference |
| CN102632206B (en) * | 2012-04-23 | 2014-01-15 | 江苏派尔钢铁节能技术有限公司 | Novel environment-friendly and safe heating device for burial pits and method |
| CN104308129B (en) * | 2014-09-30 | 2016-05-11 | 共享铸钢有限公司 | A kind of complex structure large-scale steel-casting hot shake-out annealing device and casting technique |
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