CN109530646A - For reducing the control method of head and tail temperature difference before direct rolling process continuous casting billet rolls - Google Patents
For reducing the control method of head and tail temperature difference before direct rolling process continuous casting billet rolls Download PDFInfo
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- CN109530646A CN109530646A CN201811614600.1A CN201811614600A CN109530646A CN 109530646 A CN109530646 A CN 109530646A CN 201811614600 A CN201811614600 A CN 201811614600A CN 109530646 A CN109530646 A CN 109530646A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005096 rolling process Methods 0.000 title claims abstract description 27
- 238000009413 insulation Methods 0.000 claims abstract description 28
- 238000005266 casting Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000004321 preservation Methods 0.000 description 7
- 238000003801 milling Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Continuous Casting (AREA)
Abstract
A kind of control method for rolling preceding head and tail temperature difference for reducing direct rolling process continuous casting billet, belongs to Direct Rolling Technology field.Technique: increase by two sections of insulation covers on the rollgang of the every stream of conticaster, one of section is one section of insulation cover of increase between slab off-position and scale position, the length is the half of slab cut lengths, initial point position is at the 0.25m of scale head monitoring point；Another section is that the rollgang before continuous casting billet enters the area Yi Gang increases by one section of insulation cover, and the length is the half of slab cut lengths, initial point position is the area Yi Gang forward position.Every stream caster base needs to carry out on continuous casting conveying roller way to 0.5~1.5min of temperature, time of staying temperature carries out process adjustments according to the pulling rate of conticaster before entering the area Yi Gang and carrying out cocurrent.Advantage is: realizing the effect for reducing the head and tail temperature difference of continuous casting billet, small investment and quick.Meet intensity requirement and quality is more light, field worker is facilitated to be unloaded maintenance and maintenance at any time.
Description
Technical field
The invention belongs to Direct Rolling Technology fields, provide one kind for reducing direct rolling process continuous casting billet and roll front
The control method of the tail temperature difference.
Background technique
The Direct Rolling Technology of continuous casting billet refers to that continuous casting billet without heating stove heating, after being cut off by conticaster, is directly sent
The technology rolled to milling train.The technology not only reduces production cost and energy consumption, and reduces greenhouse gas
The discharge of body.Although Direct Rolling Technology has many good qualities, due to being handled after conticaster cutting without heating furnace samming,
Head and tail temperature difference before continuous casting billet open rolling is larger, and general 10 meters long of 150 side's continuous casting billets have 80 DEG C~100 DEG C before open rolling end to end.
By taking spiral produces as an example, when the head and tail temperature difference of continuous casting billet is greater than 80 DEG C, the fluctuation range of mechanical property is
100MPa, and the steel bar mechanics performance fluctuation range of traditional heating furnace production is less than 30MPa, therefore, before directly rolling continuous casting billet milling
Head and tail temperature difference seriously affected the stability of steel product tissue and performance, reduce product quality.
Other are for controlling slab head and tail temperature difference method: 201010237764.4 semi-endless rolled overlong casting blank of patent of invention
The control method of head and tail temperature difference describes a kind of control method of slab head and tail temperature difference of semi-endless rolled technology field, main
The adjusting that enter different time sections conveying speed after soaking pit using continuous casting billet, realizes the control of slab head and tail temperature difference.Currently,
A kind of head and tail temperature difference before the rolling for directly rolling continuous casting billet can be significantly reduced there are no effective method.
Summary of the invention
The purpose of the present invention is to provide a kind of controls of the head and tail temperature difference before reduction direct rolling process continuous casting billet milling
Method mainly carries out the heat preservation of steel billet in continuous casting high temperature section and to warm process, the temperature before Lai Tigao continuous casting billet milling is equal
Even property reduces the Mechanical Fluctuation of yield, improves product quality.
The head and tail temperature difference of continuous casting billet is the direct rolling process conticaster as caused by successively solidifying green shell in continuous casting process
The pulling rate V of production is 2.0~2.8m/min, therefore for the continuous casting billet of L long, in tail portion, cutting is at that moment, empty end to end
The cold time difference is that L/V is 3~5min, and therefore, the temperature difference of continuous casting billet end to end not can avoid in direct-rolling process production process,
It can only be mitigated by other processes.Concrete technology and the technical parameter of control are as follows:
(1) increase by two sections of insulation covers on the rollgang of the every stream of conticaster, one of section is in slab off-position
Increase by one section of insulation cover between scale position, the length is the half of slab cut lengths, initial point position is scale head
At the 0.25m of portion monitoring point；Another section is that the rollgang before continuous casting billet enters the area Yi Gang increases by one section of insulation cover,
Length is the half of slab cut lengths, and initial point position is the area Yi Gang forward position (see Fig. 1)
(2) every stream caster base enter the area Yi Gang carry out cocurrent before, need to carry out on continuous casting conveying roller way to temperature 0.5~
1.5min, time of staying temperature carry out process adjustments according to the pulling rate of conticaster；
By taking long profiles 150mm × 150mm continuous casting billet as an example, under the technique of caster two cold water distribution dynamic regulation, directly roll
It is as follows that technique reduces the slab time of staying temperature selection range of slab end to end:
When pulling rate is 2.0~2.2m/min, continuous casting billet time of staying temperature is 0~0.5min；
When pulling rate is 2.2~2.5m/min, continuous casting billet time of staying temperature is 0.5~1.0min；
When pulling rate is 2.5~2.8m/min, continuous casting billet time of staying temperature is 1.0~1.5min.
Further explanation about technology arrangement
The present invention needs to increase on the rollgang of the every stream of conticaster two sections of insulation covers, and principle is raw in continuous casting billet throwing
Production process is slow, and after slab head goes out hydraulic shear position, the orientation for carrying out head to its first half is kept the temperature, after continuous casting billet
Half part is lasting air-cooled, and the final head and tail temperature for reducing continuous casting billet is poor, realizes that the temperature on continuous casting billet length direction is uniform as far as possible,
As shown in Figure 1.
Continuous casting billet is mainly utilized when not cutting off in insulation cover at position 1, and speed is equal to conticaster pulling rate V, right
It carries out the head that time span is L/V in continuous casting billet head to keep the temperature, this time, relatively subsequent roller-way time of delivery was longer, can
Adequately to reduce the head heat loss of continuous casting billet.The initial position of insulation cover at this should avoid the position of continuous casting machine sizing detection
It sets, in order to avoid influencing the normal fixed ruler cutting production of continuous casting billet, is tested repeatedly by scene, the distance greater than 0.25m need to be vacated.But
It is excessive to be that the distance is not easy, in order to avoid influence 1 section of insulation cover of even temperature effect.
Insulation cover at position 2 mainly needs the characteristics of waiting using continuous casting billet co-current process, according to conticaster pulling rate
Difference, adjust the waiting time before conticaster cocurrent in real time, it is same to reduce to the heat preservation that the head of continuous casting billet is oriented
The heat loss on continuous casting billet head.The present invention operates the heat preservation method that the head of continuous casting billet is oriented by two sections of insulation covers,
Realize the purpose for reducing direct-rolling process continuous casting billet head and tail temperature difference.
Further explanation about technological parameter
General continuous casting billet direct rolling process requires at least 900 DEG C or more of start rolling temperature of slab, therefore, defeated to conticaster
The slab temperature of section is sent to require.In order to preferably formulate continuous casting billet to warm technique, need the continuous casting to different casting
Base surface temperature is calculated.
Conticaster using most commonly seen arc radius for 8m produces the continuous casting billet of 150mm × 150mm as standard state, counts
Calculation obtain pulling rate be 2m/min when, steel billet entire continuous casting process change of temperature field as indicated at 3, off-position is minimum with steel rolling
The time interval of temperature position is 1.5min, and common slab to the necessary time of delivery between steel rolling be 1.5min or so, because
This, when pulling rate is 2m/min, steel billet not can be carried out waiting in position 2, it is necessary to be rolled before sending in time to milling train.Similarly,
When can also calculate standard state in front, when pulling rate is 2.8m/min, off-position and steel rolling minimum temperature position
The time interval set is 3min, removes slab necessity time of delivery 1.5min, and continuous casting billet can be in 2 maximum latency of position
1.5min, steel billet entire continuous casting process change of temperature field as indicated at 4.
The time of staying temperature of 2 sections of insulation cover of continuous casting billet of the present invention is the state of temperature according to continuous casting billet and steel rolling requirement
What minimum temperature was determined.Front is calculated, when conticaster pulling rate is 2.0~2.8m/min, continuous casting billet is maximum allowable etc.
It is 0~1.5min to the time, therefore, for produced on-site aspect, the pulling rate range of conticaster is divided into three sections, for every section of company
Slab uses different time of staying temperature.
It is designed about insulation cover:
For traditional insulation cover in such a way that steel plate welds rib, steel plate itself needs to provide certain strength support, because
This its thickness is bigger, big more options 3mm or more.In addition, the design length of conventional vacuum cover is longer, conticaster conveying is not met
The condition of production of section brings trouble to maintenance and maintenance, affects production.
Insulation cover of the invention uses angle steel and does structural framing, and the steel plate of 1mm thickness, this kind of design scheme are welded in outer surface
Steel angle structure frame be able to satisfy the intensity requirement of heat preservation, therefore steel plate, on the basis of meeting welding and wanting, specification can be selected
That selects is thin as far as possible.Insulation cover of the invention selects length for 1m, and upper surface facilitates Field Force producing using one double handles
Any splicing and replacement are carried out in the process, facilitate production and maintenance.The specific sketch of its insulation cover is as shown in Figure 2.
The present invention has the advantage that
1, do not change original roller-way and production method, only by two sections of insulation covers of increase, then cooperate to warm technique
Realize the effect for reducing the head and tail temperature difference of continuous casting billet, small investment and quick.
2, can be subtracted to greatest extent for the continuous casting process under different casting state using the different casting blank waiting time
The loss of few slab head temperature, reduces the head and tail temperature difference of continuous casting billet.
3, insulation cover uses upper button, and single insulation cover length is 1m, and two sections of heat preservation positions can be arbitrarily according to continuous casting billet
Length carries out splicing use, using the frame structure of angle steel, meets intensity requirement and quality is more light, facilitate field worker
Maintenance and maintenance are unloaded at any time.
Detailed description of the invention
Fig. 1 is site technique layout drawing of the invention, specifies the application site of two sections of insulation covers.
Fig. 2 is the information such as the sketch, including specific size, materials of insulation cover.
Fig. 3 is 150 common side's conticaster pulling rates when being 2m/s, the casting billet surface of entire continuous casting process and the temperature of center portion
Change over time curve graph.
Fig. 4 is 150 common side's conticaster pulling rates when being 2.8m/s, the casting billet surface of entire continuous casting process and the temperature of center portion
Degree changes over time curve graph.
Fig. 5 is not using the yield strength of the HRB400 of this method and the data statistics figure of tensile strength.
Fig. 6 is using the yield strength of HRB400 after this method and the data statistics figure of tensile strength.
Specific embodiment
Certain long profiles manufacturing enterprise produces HRB400 reinforcing bar, continuous casting billet rule using the direct rolling process of electric furnace short route
Lattice are 150mm × 150mm, length 6m, pulling rate 2.4m/min, and crystallizer water is 170m3/ h, cast temperature 1530
DEG C, the dimensions of product isChemical component as shown in table 1
The chemical component (surplus Fe) of certain factory of table 1 HRB400 reinforcing bar
| Ingredient | C | Si | Mn | P | S | Nb | V |
| Content | 0.23 | 0.45 | 0.85 | ≤0.04 | ≤0.03 | ≤0.01 | 0.04 |
When this discovery not being used to carry out samming technology controlling and process, head upper surface temperature when slab is cut off is 955 DEG C, tail
Portion upper surface is 1035 DEG C, and head and tail temperature difference is 80 DEG C at this time.Continuous casting billet, into quick rollgang, is transported to after cocurrent
Before roughing mill, the head upper surface temperature of continuous casting billet is 905 DEG C at this time, and tail portion upper surface temperature is 975 DEG C, at this time head and tail temperature difference
It is 70 DEG C.
When carrying out samming control using 2 segmentation insulation covers of the invention, the time of staying temperature of slab is at 2 sections of heat preservations
0.8min.Head upper surface temperature when slab is cut off is 965 DEG C, and tail portion upper surface is 1035 DEG C, and head and tail temperature difference is 70 at this time
℃.Then, continuous casting billet carries out the waiting of 0.8min before cocurrent, carries out the orientation heat preservation on head.Then continuous casting billet passes through cocurrent
Afterwards, into quick rollgang, before being transported to roughing mill, the head upper surface temperature of continuous casting billet is 910 DEG C at this time, table on tail portion
Face temperature is 950 DEG C, and head and tail temperature difference is 40 DEG C at this time.Obviously, the samming of 2 sections of insulation covers significantly reduces the heat on continuous casting billet head
Loss.
Therefore, the continuous casting billet even temperature effect that this method is carried out in the steel mill is obvious, before roughing the head and tail temperature difference of continuous casting billet by
70 DEG C originally are reduced to 40 DEG C, reduce 57%.The mechanical property variation of product as shown in Figure 5, Figure 6, yield strength and anti-
The fluctuation range of tensile strength is reduced into 50MPa by original 100MPa, and the effect of this method stable prod performance is obvious.
Claims (1)
1. a kind of for reducing the control method of head and tail temperature difference before direct rolling process continuous casting billet rolls, it is characterised in that:
(1) increase by two sections of insulation covers on the rollgang of the every stream of conticaster, one of section is in slab off-position and to determine
Increase by one section of insulation cover between ruler position, the length is the half of slab cut lengths, initial point position is scale head prison
At the 0.25m of measuring point；Another section is that the rollgang before continuous casting billet enters the area Yi Gang increases by one section of insulation cover, length
For the half of slab cut lengths, initial point position is the area Yi Gang forward position；
(2) every stream caster base enter the area Yi Gang carry out cocurrent before, need to carry out on continuous casting conveying roller way to temperature 0.5~
1.5min, time of staying temperature carry out process adjustments according to the pulling rate of conticaster；
Long profiles 150mm × 150mm continuous casting billet, under the technique of caster two cold water distribution dynamic regulation, direct-rolling process reduces casting
The slab time of staying temperature selection range of base end to end is as follows:
When pulling rate is 2.0~2.2m/min, continuous casting billet time of staying temperature is 0~0.5min；
When pulling rate is 2.2~2.5m/min, continuous casting billet time of staying temperature is 0.5~1.0min；
When pulling rate is 2.5~2.8m/min, continuous casting billet time of staying temperature is 1.0~1.5min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811614600.1A CN109530646B (en) | 2018-12-27 | 2018-12-27 | Control method for reducing temperature difference between head and tail of continuous casting billet in direct rolling process |
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| CN201811614600.1A CN109530646B (en) | 2018-12-27 | 2018-12-27 | Control method for reducing temperature difference between head and tail of continuous casting billet in direct rolling process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110125359A (en) * | 2019-06-10 | 2019-08-16 | 中冶赛迪技术研究中心有限公司 | A kind of control method and system of the continuous casting secondary cooling water reducing continuous casting billet head and tail temperature difference |
| CN110711785A (en) * | 2019-10-10 | 2020-01-21 | 中冶南方连铸技术工程有限责任公司 | Method and system for controlling temperature of fixed-length casting blank before rolling |
| CN111167855A (en) * | 2019-12-26 | 2020-05-19 | 河钢股份有限公司承德分公司 | Rod and wire rod concurrent heating rolling process |
| CN114589376A (en) * | 2022-03-15 | 2022-06-07 | 山东钢铁集团永锋临港有限公司 | Uncut alarm method for cutting casting blank by flame cutting machine |
| CN114799095A (en) * | 2022-04-28 | 2022-07-29 | 广西柳州钢铁集团有限公司 | Heating-free direct rolling method for steel bars and steel bars rolled by heating-free direct rolling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110125359A (en) * | 2019-06-10 | 2019-08-16 | 中冶赛迪技术研究中心有限公司 | A kind of control method and system of the continuous casting secondary cooling water reducing continuous casting billet head and tail temperature difference |
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| CN114589376A (en) * | 2022-03-15 | 2022-06-07 | 山东钢铁集团永锋临港有限公司 | Uncut alarm method for cutting casting blank by flame cutting machine |
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| CN114799095A (en) * | 2022-04-28 | 2022-07-29 | 广西柳州钢铁集团有限公司 | Heating-free direct rolling method for steel bars and steel bars rolled by heating-free direct rolling method |
| CN114799095B (en) * | 2022-04-28 | 2023-12-29 | 广西柳州钢铁集团有限公司 | Reinforcement bar heating-free direct rolling method and reinforcement bar rolled by heating-free direct rolling method |
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