CN105222581B - Method adopting walking beam type heating furnace for heating low temperature billets - Google Patents
Method adopting walking beam type heating furnace for heating low temperature billets Download PDFInfo
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- CN105222581B CN105222581B CN201510785606.5A CN201510785606A CN105222581B CN 105222581 B CN105222581 B CN 105222581B CN 201510785606 A CN201510785606 A CN 201510785606A CN 105222581 B CN105222581 B CN 105222581B
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Abstract
The invention discloses a method adopting a walking beam type heating furnace for heating low temperature billets in the field of metal heating. The method comprises the steps that during furnace charging, one ends, with better quality, of to-be-heated low temperature billets are arranged on a rolling mill side of the heating furnace in an alignment manner, opening degrees of burners firing at lower parts of a heating section and a preheating section of the heating furnace are adjusted, partial burners at the upper parts of the preheating section and the heating section are closed, finally smoke brake openings and the air-gas ratio are adjusted, and the heating temperature is well controlled for heating the billets. The method has the advantages that a special billet arrangement form is adopted, the burner opening degrees, the opening and closing number, the air-gas ratio are adjusted, the furnace pressure and the smoke brake openings are controlled, and a suitable to-roll holding system is adopted, so that a conventional heating furnace can be used for heating the low temperature billets, the uniformity of the low temperature billet heating temperature is guaranteed, the stability of the low temperature billet rolling state and the production efficiency are improved accordingly, and the purposes of reducing the production cost and improving the economic benefit are realized.
Description
Technical field
The present invention relates to METAL HEATING PROCESS field, more particularly to a kind of side of employing walking beam heating furnace heating low temperature steel billet
Method.
Background technology
Two large-scale walking beam type plate blank heating furnaces of certain equipment of Hot Strip Mill design and construction, its effective length is 43.5m, stove
Interior a width of 11.6m.The specification for heating long chi steel billet is：200 × 750～1350 × 8500～11000mm, the specification of short chi steel billet
For：200 × 750～1350 × 4600～5300mm, design requirement adopts single or double balance distributing mode.
The specification of low temperature steel billet to be heated is：180～200 × 1050～1250 × 7200～8000mm, this raw material rule
Lattice are beyond the intrinsic cloth specification limit of heating furnace.In order to ensure low temperature steel billet as-rolled condition uniformity, one is typically chosen
The distributing mode of end alignment, because low temperature steel billet longer dimension chi steel billet is partially short, an end head is away from burner 0.5m, another end head
It is again low-temperature heat away from burner 3m, fire box temperature control ratio common straightcarbon steel is low 350～400 DEG C, therefore conventional heating stove heat
There is burner flame during low temperature steel billet partially short, low temperature steel billet end to end, the upper and lower surface temperature difference it is big, cause as-rolled condition unstable.
The content of the invention
To overcome existing heating furnace insufficient to low temperature heating steel billet, cause the unstable grade of as-rolled condition not enough, the present invention
Technical problem to be solved is：There is provided a kind of parameters by existing walking beam heating furnace to be controlled, so as to
Method for heating low temperature steel billet.
The technical solution adopted for the present invention to solve the technical problems is：
The method for heating low temperature steel billet using walking beam heating furnace, comprises the following steps：
The relatively good one end alignment of low temperature billet quality to be heated is placed on the milling train side of heating furnace when A, shove charge；
B, the burner opening adjustment that the bringing-up section of heating furnace, preheating pars infrasegmentalis catch fire are 35%～50%, are closed pre-
Hot arc, the part burner on bringing-up section top；
C, adjustment heating furnace both sides cigarette lock opening degree and preheating section, bringing-up section, the empty coal proportioning of soaking zone；
By preheating section upper furnace temperature control at 830～850 DEG C when D, heating, bringing-up section upper furnace temperature control exists
860～880 DEG C, soaking zone upper furnace temperature control at 860 ± 5 DEG C, preheating section, bringing-up section and soaking zone lower furnace portion temperature
Degree is according to 0～20 DEG C lower than respective upper temp control.
Be further, in step A the preferable one end of low temperature billet quality refer to inside steel billet constituent structure it is more stable,
The more complete one end of apparent size.
It is further to be evenly equipped with 8 burners on the preheating section of heating furnace and bringing-up section upper width direction in step B,
Preheating section retains the 3rd, the 4th, the 7th burner started from milling train side and catches fire, and bringing-up section retains the 2nd, the 5th started from milling train side
Individual burner catches fire.
Be further, in step C heating furnace both sides cigarette lock opening degree according to the aperture efficiency opposite side of milling train side opening
Little 6% is controlled.
It is further that bringing-up section, preheating section top sky coal proportioning are by 3.0～6.0 controls, soaking zone top in step C
, by 4.0～6.0 controls, all lower section sky coal proportionings are by 1.8～2.0 controls for empty coal ratio.
It is further that mixed gas calorific value is pressed into 1700 ± 50Kcal/m during heating3Control.
It is further that the controling of the pressure of the oven of heating furnace is in 3～5Pa.
It is further, before low temperature steel billet enters milling train after step D has been heated, if stopping rolling more than 30 minutes, palpus
Fire box temperature is reduced to into less than 800 DEG C and is incubated, the heating-up time resumed production should be identical with cooling temperature retention time.
The invention has the beneficial effects as follows：By using specific steel billet arrangement form, adjustment burner opening degree and opening and closing number
Amount, empty coal proportioning, controling of the pressure of the oven and cigarette lock opening degree is controlled, and using appropriate keeping temperature rule to be rolled, and control coal
Gas calorific value so that normal reheating furnace can be used in heating low temperature steel billet, and ensure the uniformity of low temperature billet heating temperature, so as to
The stable and production efficiency of low temperature steel billet as-rolled condition is improve, production cost and the purpose increased economic efficiency is reduced.
Specific embodiment
With reference to the present invention is further described.
The method for heating low temperature steel billet using walking beam heating furnace, comprises the following steps：
The relatively good one end alignment of low temperature billet quality to be heated is placed on the milling train side of heating furnace when A, shove charge；
B, the burner opening adjustment that the bringing-up section of heating furnace, preheating pars infrasegmentalis catch fire are 35%～50%, are closed pre-
Hot arc, the part burner on bringing-up section top；
C, adjustment heating furnace both sides cigarette lock opening degree and preheating section, bringing-up section, the empty coal proportioning of soaking zone；
By preheating section upper furnace temperature control at 830～850 DEG C when D, heating, bringing-up section upper furnace temperature control exists
860～880 DEG C, soaking zone upper furnace temperature control at 860 ± 5 DEG C, preheating section, bringing-up section and soaking zone lower furnace portion temperature
Degree is according to 0～20 DEG C lower than respective upper temp control.
Due to low temperature steel billet in the fabrication process its have differences end to end, in order to ensure that every block of low temperature steel billet is entering milling train
When state consistency and stability, it should first allow the preferable one end of quality to be introduced into milling train, and due to the size of low temperature steel billet
It is shorter than furnace design size, need to be by the way of the alignment of one end, so with the preferable one end alignment of billet quality in arrangement
It is best arrangement that heating furnace is placed near the side of milling train.Because the heating-up temperature of low temperature steel billet compares common straightcarbon steel
It is low 350～400 DEG C, need to turn flame down in heating, now the length of flame will shorten, so in order to ensure the length of flame, just
The opening for reducing burner is needed, through test, can be expired when actual aperture is adjusted to the 35%～50% of maximum open
Foot is required.Control heating-furnace bore temperature and the length of flame are the crucial steps of a comparison, it is ensured that steel billet is heated evenly,
Internal structure is more stable.
Screen low temperature steel billet when, the internal structure of steel billet should be checked first, can by observation surface color or
Detected by some detection devices, picked out the more stable one end of internal structure, if two ends internal structure is close
The more complete one end of outward appearance is then selected as the preferable one end of quality.
Because heating-up temperature can not be too high, so needing the burning caught fire for reducing heating furnace top in preheating section and bringing-up section
Unrounded number, existing heating furnace upper width direction is typically provided 8 burners being evenly arranged, and reduce still will protect after burner quantity
Card heating uniformity because low temperature steel billet be by near milling train side one end on the basis of align, preheating section retain from
The the 3rd, the 4th, the 7th burner that milling train side starts catches fire, and bringing-up section retains the 2nd, the 5th burner started from milling train side and catches fire just
The heated uniformity in low temperature steel billet top is can guarantee that, while temperature is unlikely to too high again.
In order to ensure fire box temperature of the low temperature steel billet away from one end of milling train side not over regulation, need to adjust both sides cigarette
Lock opening degree difference, through constantly test heating furnace both sides cigarette lock opening degree opening according to the aperture efficiency opposite side of milling train side is found
Mouth little 6% can ensure that the temperature at low temperature steel billet two ends is close to and meets requirement when being controlled.
Because bringing-up section, preheating section top burner part are closed, the burner of closing is only closed coal gas, is not turned off air, and
Whole section of only one of which regulating valve, therefore empty coal proportioning is larger, in order to meet use requirement, preheating section top sky coal proportioning presses 3.0
～6.0 controls, by 4.0～6.0 controls, all lower section sky coal proportionings are by 1.8～2.0 controls for soaking zone top sky coal ratio.This
The empty coal proportioning of sample control can guarantee that burning is abundant, and homogeneous heating is also not in the wasting of resources.
In the case where control fire box temperature and pressure are constant, by reducing mixed gas calorific value, increase mixed gas and use
Amount, to guarantee the length of flame, through test, mixed gas calorific value is controlled in 1700 ± 50Kcal/m3Preferably.
Control furnace pressure is also noted that during heating, heating furnace easily inhales cold wind when furnace pressure is too small, causes fire box temperature
Fluctuation, pressure is excessive easily to cause damage to heating furnace, typically that controling of the pressure of the oven is more rational in 3～5Pa.
When special circumstances occurs in milling train to be needed to shut down, if stopping rolling more than 30 minutes, fire box temperature must be reduced to 800
Below DEG C and it is incubated, the heating-up time resumed production should be identical with cooling temperature retention time, so just can guarantee that the low temperature after heating
The stability of inside steel billet structure.
The present invention breaches the original design requirement of walking beam furnace, realizes with conventional walking beam heating furnace heating
The method of low temperature steel billet, practical effect substantially, that is, ensure that the uniformity of low temperature billet heating temperature, and rolling is improve again
The production efficiency of the stable and low temperature steel billet of state, has reached the purpose for reducing production cost and increasing economic efficiency.
Claims (8)
1. the method for low temperature steel billet being heated using walking beam heating furnace, it is characterised in that comprise the following steps：
The relatively good one end alignment of low temperature billet quality to be heated is placed on the milling train side of heating furnace when A, shove charge；
B, the burner opening adjustment that the bringing-up section of heating furnace, preheating pars infrasegmentalis catch fire are 35%～50%, closing preheating section,
The part burner on bringing-up section top；
C, adjustment heating furnace both sides cigarette lock opening degree and preheating section, bringing-up section, the empty coal proportioning of soaking zone；
By preheating section upper furnace temperature control at 830～850 DEG C when D, heating, bringing-up section upper furnace temperature control is 860
～880 DEG C, soaking zone upper furnace temperature control at 860 ± 5 DEG C, preheating section, bringing-up section and soaking zone lower furnace portion temperature
According to 0～20 DEG C lower than respective upper temp control.
2. the method for as claimed in claim 1 low temperature steel billet being heated using walking beam heating furnace, it is characterised in that：Step A
The preferable one end of middle low temperature billet quality refers to one end that inside steel billet constituent structure is more stable, apparent size is more complete.
3. the method for as claimed in claim 1 low temperature steel billet being heated using walking beam heating furnace, it is characterised in that：Step B
8 burners are evenly equipped with the preheating section of middle heating furnace and bringing-up section upper width direction, preheating section retains what is started from milling train side
3rd, the 4th, the 7th burner catches fire, and bringing-up section retains the 2nd, the 5th burner started from milling train side and catches fire.
4. the method for as claimed in claim 1 low temperature steel billet being heated using walking beam heating furnace, it is characterised in that：Step C
Middle heating furnace both sides cigarette lock opening degree is controlled according to the opening little 6% of the aperture efficiency opposite side of milling train side.
5. the method for as claimed in claim 1 low temperature steel billet being heated using walking beam heating furnace, it is characterised in that：Step C
Middle bringing-up section, preheating section top sky coal proportioning are owned by 3.0～6.0 controls, soaking zone top sky coal ratio by 4.0～6.0 controls
Lower section sky coal proportioning is by 1.8～2.0 controls.
6. the employing walking beam heating furnace as described in Claims 1 to 5 any one claim heats the side of low temperature steel billet
Method, it is characterised in that：Mixed gas calorific value is pressed into 1700 ± 50Kcal/m during heating3Control.
7. the employing walking beam heating furnace as described in Claims 1 to 5 any one claim heats the side of low temperature steel billet
Method, it is characterised in that：The controling of the pressure of the oven of heating furnace is in 3～5Pa.
8. the employing walking beam heating furnace as described in Claims 1 to 5 any one claim heats the side of low temperature steel billet
Method, it is characterised in that：Before low temperature steel billet enters milling train after step D has been heated, if stopping rolling more than 30 minutes, must be by burner hearth
Temperature is reduced to less than 800 DEG C and is incubated, and the heating-up time resumed production should be identical with cooling temperature retention time.
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| CN108637148B (en) * | 2018-04-28 | 2019-12-13 | 吴京祥 | three-section type heating process method for forging blank |
| CN108645233B (en) * | 2018-05-15 | 2019-10-08 | 首钢集团有限公司 | A method of it reduces and heats the time to be rolled |
| CN109055713B (en) * | 2018-10-11 | 2020-01-14 | 攀钢集团西昌钢钒有限公司 | Method for controlling slab temperature and furnace temperature of double-heat-storage type heating furnace |
| CN115478154A (en) * | 2021-06-16 | 2022-12-16 | 山西太钢不锈钢股份有限公司 | Flexible subarea combustion control method of heating furnace |
| CN113551518B (en) * | 2021-07-29 | 2023-12-26 | 湖北中冶窑炉有限公司 | Stainless steel perforation pre-heating method based on stepping bottom type heating furnace |
| CN113883899B (en) * | 2021-10-19 | 2023-09-05 | 攀钢集团西昌钢钒有限公司 | Energy-saving rolling waiting method for double-heat accumulating type heating furnace |
| CN114438300A (en) * | 2022-01-21 | 2022-05-06 | 包头钢铁（集团）有限责任公司 | Energy-saving steel-burning heating method for regenerator heating furnace |
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| JP2001272028A (en) * | 2000-03-24 | 2001-10-05 | Kawasaki Steel Corp | Method for operating continuous heating furnace |
| CN101748264B (en) * | 2010-01-11 | 2011-08-10 | 攀钢集团攀枝花钢钒有限公司 | Heating method of weather-proof sheet billet |
| CN102242249B (en) * | 2011-06-30 | 2013-02-06 | 首钢总公司 | Heating device for improving heating quality of steel billets and using method thereof |
| CN102268532B (en) * | 2011-07-28 | 2013-05-08 | 攀钢集团有限公司 | Method for realizing low-temperature heating process by using conventional walking beam type heating furnace |
| CN103736742A (en) * | 2013-12-26 | 2014-04-23 | 秦皇岛首秦金属材料有限公司 | Medium plate surface longitudinal edge crack control method |
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