CN106086352B - A kind of control method for improving anchor bar steel center portion abnormal structure - Google Patents
A kind of control method for improving anchor bar steel center portion abnormal structure Download PDFInfo
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- CN106086352B CN106086352B CN201610539537.4A CN201610539537A CN106086352B CN 106086352 B CN106086352 B CN 106086352B CN 201610539537 A CN201610539537 A CN 201610539537A CN 106086352 B CN106086352 B CN 106086352B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
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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
- B22D11/18—Controlling or regulating processes or operations for pouring
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- Engineering & Computer Science (AREA)
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- Crystallography & Structural Chemistry (AREA)
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- Organic Chemistry (AREA)
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Abstract
A kind of control method for improving anchor bar steel center portion abnormal structure, belongs to bar steel rolling technical field.Specific steps and parameter are as follows：Control the degree of superheat in casting process, the degree of superheat≤35 DEG C；The method that cooling by water+reply section is used after 12# milling trains, before finish rolling, mill speed is 6 6.6m/s；Final rolling temperature is set as 850 DEG C ± 15 DEG C, and the temperature rise of finishing stands is controlled at 80 120 DEG C；After finish rolling by the way of cooler is alternately cooled, the instantaneous cooling rate in cooling procedure must not exceed 260 DEG C/s；Temperature on cooling table control is 720 740 DEG C.Advantage is：Improve the comprehensive mechanical property and quality of anchor bar steel, the improvement for anchor bar steel core structure.
Description
Technical field
The invention belongs to bar steel rolling technical field, more particularly to a kind of controlling party for improving anchor bar steel center portion abnormal structure
Method.The technology that each specification anchor bar steel is developed suitable for Bars Workshop optimizes.
Background technology
Anchor bar steel is more and more applied among mine support, user to the intensity rank demand of anchor bar steel increasingly
It is high.In order to reach required intensity rank, often developers use during composition design and improve carbon, manganese, vanadium etc.
The content of alloying element, to reach defined intensity rank.With the raising of carbon and manganese content, intensity also follows its lifting, certainly will
Cause being remarkably decreased for plasticity and toughness energy, the safety coefficient of the reduction direct relation coal mine roadway of its comprehensive mechanical property, therefore, carry
The comprehensive mechanical property of high anchor bar steel is most important.Tissue is one of the key factor for influenceing comprehensive mechanical property, tissue it is different
The reduction of performance certainly will often be caused.Carbon and manganese content is improved, the component segregation in strand aggravates with dendritic segregation, in roller repairing
It is easy to serious tissue abnormalities occur during control, causes the reduction of combination property.The abnormal structure of center portion can be improved,
It is high-grade steel urgent problem to be solved.
Being directed to improves the method for organizing of center portion, and in continuous-casting art, scientific research personnel passes through each parameter in casting process
Adjust as light above the reduction degree of superheat, control centre's segregation, the stirring of crystallizer battery, end electromagnetic agitation, continuous cast billet
Pressure etc. make it that the segregation of the elements such as strand heart defect, dendritic segregation and equiaxed zone ratio is improved to a certain extent.
But as requirement of the coal enterprise to anchor pole hardness of steel improves, at the same to plasticity and toughness energy it is also proposed that tightened up requirement, it is this
In the case of, continuous cast billet improve the abnormal advantage of core structure performed to it is certain ultimate attainment, by optimizing continuous casting process
Come reduce roll after the exception organized be difficult.In steel rolling field, how researcher also actively passes through optimal control in research
Rolling mill practice is brought (as reduced start rolling temperature, lengthening soaking time, reduction rolling temperature and temperature on cooling table) to reduce strand
Genetic defect.Enterprise also attempts to make up the influence of center portion abnormal structure by crystal grain thinning, but this method is to height
The effect of the anchor bar steel of rank is not notable.
By the control situation of the technological parameters such as the degree of superheat of tracking continuous casting billet repeatedly, repeatedly and to strand segregation
After comprehensive analysis, with reference to the actual conditions of rolling line and cooler, in-depth analysis the reason for by occurring extremely to core structure
Research, having summed up the reason for center portion abnormal structure occurs is：The high aggregation of the elements such as some region carbon, manganese, changes this
The CCT curve in region so that steel crosses ferrite and pearlite area under the conditions of existing cooling rate, is directly entered bainite and horse
Family name's body limited proportionality, there occurs abnormal structure's transformation.Therefore, from this angle, the key that center portion abnormal structure occurs is improved
How be by the cooling velocity after studying during controlled rolling and rolling, how to optimize cooling system technological parameter, reduce into
Enter the transition region of abnormal structure, it is very crucial so as to reduce the appearance quantity of abnormal structure.
The present invention, by verification experimental verification repeatedly, has finally formulated a set of perfect cooling on the basis of further investigation
Process system so that the tissue of high-level anchor bar steel center portion is significantly improved, and the comprehensive mechanical property of anchor bar steel obtains bright
Aobvious raising.
The content of the invention
It is an object of the invention to provide a kind of control method for improving anchor bar steel center portion abnormal structure, solves continuous casting life
Can be relatively low due to the plasticity and toughness that organizational factor brings during production High strength bolt steel the problem of.It is effectively reduced center portion exception
Tissue, improve the comprehensive mechanical property of anchor bar steel.This method is adapted to exploitation of the bar in the kind material for improving core structure.
The advantage of the process system of the present invention is, by optimizing cooling technique system, to control the tissue of structural transformation microcell
Transformation, it is proposed that improve the abnormal method of bar center portion, compensate for component segregation and dendritic segregation, the steel rolling of casting process strand
During structural transformation the tissue abnormalities that bring of secondary component diffusion aggregation, improve the comprehensive mechanical property of anchor bar steel, carry
The high quality of anchor bar steel kind.
A kind of control method for improving anchor bar steel center portion abnormal structure, concrete technology step and parameter are as follows：
1) degree of superheat in casting process, the degree of superheat≤35 DEG C are controlled；Poured in casting process using electromagnetic agitation with protection
Note；Casting speed control is 1.8-2.2m/s in casting process；Heating-up temperature is 1150 DEG C ± 20 DEG C, and the heat time is 2-3 hours；
In casting process, the degree of superheat and the pulling rate in casting process are controlled, the improvement to the dendritic segregation of strand is played
Very big effect.The lifting of heating-up temperature and the proper extension of heat time, can make it that the composition of strand is more uniform, one
Determine to weaken component segregation in degree.
2) method that cooling by water+reply section is used after 12# milling trains, before finish rolling, controlled rolling speed is 6-6.6m/s, cold
But the cooling velocity during is 70-81 DEG C/s, and cooling procedure time control is in 2-2.2s；
It is the position of 1# water cooling sections after 12# milling trains, before 13# milling trains, the position, which is divided into, wears water section with replying two stages of section,
The purpose in the stage is so that the temperature of stocking and the core table temperature difference are reduced to suitable temperature, is easy to finishing mill to carry out low temperature essence
Roll.The control cooling of the cooling section can make it that steel billet whole cross section and the core table temperature difference are more uniform, be advantageous to organize after rolling
Uniform change.
3) final rolling temperature is set as 850 DEG C ± 15 DEG C, and the temperature rise of finishing stands is controlled at 80-120 DEG C；
The temperature rise of control finishing stands has two purposes, and one is to prevent 2 sections of excessive temperature differentials for wearing water, causes the core table temperature difference
It is excessive, so that the tissue odds at stocking interface and core structure are abnormal；Secondly to prevent that cooling rate is excessive, stocking surface is caused to go out
Existing over-cooling structure.
4) for finish rolling aftercooler by the way of cooler is alternately cooled, controlled rolling speed is 12-16m/s, cooled
Cooling velocity in journey is 125-165 DEG C/s, and cooling procedure time control is 1.5-2s；Instantaneous cooling rate in cooling procedure
260 DEG C/s is must not exceed, to prevent the expendable over-cooling structure in surface；
Control cooling velocity after rolling is to control the key parameter before structural transformation.Only control 2# coolers after finish rolling
Cooling, it just can ensure that the tissue of the abnormal structure after rolling is reduced.If the cooling velocity after rolling is excessive, the abnormal structure of center portion is caused to increase
More, plasticity and toughness can deteriorate rapidly；If the cooling velocity after rolling is too small, the temperature reduction of stocking is too low, can not meet high-level
The performance requirement of anchor bar steel, therefore, it is crucial to control the cooling system (cooling section is distributed and cool time distribution) of 2# sections.
5) temperature on cooling table control is 720-740 DEG C.
The advantage of the invention is that：Improve anchor bar steel core structure, improve the comprehensive mechanical property and quality of anchor bar steel.
Brief description of the drawings
Fig. 1 is the core structure 500X figures before present invention process is implemented.
Fig. 2 is the core structure 500X figures after present invention process is implemented.
Fig. 3 is the matrix 1000X figures after present invention process is implemented.
Embodiment
Technical scheme is discussed in detail below by embodiment：
Embodiment 1
1) degree of superheat in casting process, 30 DEG C of the degree of superheat are controlled；Material electromagnetic agitation and molding casting in casting process；
Casting speed control is 1.8m/s in casting process；Heating-up temperature is 1150 DEG C, 2.5 hours heat times.
2) method that cooling by water+reply section is used after 12# milling trains, before finish rolling, controlled rolling speed is 6.6m/s, cooling
During cooling velocity be 71 DEG C/s, cooling procedure time control is in 2.1s；
3) final rolling temperature is set as 850 DEG C, and the temperature rise of finishing stands is controlled at 111 DEG C；
4) finish rolling aftercooler is by the way of cooler is alternately cooled, and controlled rolling speed is 16m/s, in cooling procedure
Cooling velocity be 160 DEG C/s, cooling procedure time control is 2s；255 DEG C/s of instantaneous cooling rate in cooling procedure.
5) temperature on cooling table control is 730 DEG C.
The invention implement after, 600Mpa level anchor bar steels core structure be improved significantly, the martensite quantity of center portion is a large amount of
Reduction.Yield strength >=626Mpa of stocking, tensile strength ＞ 810Mpa, elongation percentage >=24%, ballistic work average value than
Preceding raising 10J；Whole satisfaction >=40J standard requirement.
Embodiment 2
1) degree of superheat in casting process, 29 DEG C of the degree of superheat are controlled；Material electromagnetic agitation and molding casting in casting process；
Casting speed control is 2.0m/s in casting process；Heating-up temperature is 1140 DEG C, 3 hours heat times.
2) method that cooling by water+reply section is used after 12# milling trains, before finish rolling, controlled rolling speed is 6.0m/s, cooling
During cooling velocity be 80 DEG C/s, cooling procedure time control is in 2.0s；
3) final rolling temperature is set as 855 DEG C, and the temperature rise of finishing stands is controlled at 99 DEG C；
4) finish rolling aftercooler is by the way of cooler is alternately cooled, and controlled rolling speed is 16m/s, in cooling procedure
Cooling velocity be 150 DEG C/s, cooling procedure time control is 2s；Instantaneous cooling rate in cooling procedure is 240 DEG C/s.
5) temperature on cooling table control is 725 DEG C.
The invention implement after, 600Mpa level anchor bar steels core structure be improved significantly, the martensite quantity of center portion is a large amount of
Reduction.Yield strength >=626Mpa of stocking, tensile strength ＞ 810Mpa, elongation percentage >=24%, ballistic work average value than
Preceding raising 11J；Whole satisfaction >=40J standard requirement.
Claims (2)
1. a kind of control method for improving anchor bar steel center portion abnormal structure, it is characterised in that concrete technology step and parameter are as follows：
1) degree of superheat in casting process, the degree of superheat≤35 DEG C are controlled；Electromagnetic agitation and molding casting are used in casting process；Even
Casting speed control is 1.8-2.2m/s during casting；Heating-up temperature is 1150 DEG C ± 20 DEG C, and the heat time is 2-3 hours；
2) method that cooling by water+reply section is used after 12# milling trains, before finish rolling, controlled rolling speed is 6-6.6m/s, cooled
Cooling velocity in journey is 70-81 DEG C/s, and cooling procedure time control is in 2-2.2s；
3) final rolling temperature is set as 850 DEG C ± 15 DEG C, and the temperature rise of finishing stands is controlled at 80-120 DEG C；
4) finish rolling aftercooler is by the way of cooler is alternately cooled, and controlled rolling speed is 12-16m/s, in cooling procedure
Cooling velocity be 125-165 DEG C/s, cooling procedure time control is 1.5-2s；Instantaneous cooling rate in cooling procedure must not
More than 260 DEG C/s, to prevent the expendable over-cooling structure in surface；
5) temperature on cooling table control is 720-740 DEG C.
2. according to the method for claim 1, it is characterised in that yield strength >=626MPa of anchor bar steel stocking, tension are strong
Spend ＞ 810MPa, elongation percentage >=24%.
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| CN201610539537.4A CN106086352B (en) | 2016-07-08 | 2016-07-08 | A kind of control method for improving anchor bar steel center portion abnormal structure |
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| CN201610539537.4A CN106086352B (en) | 2016-07-08 | 2016-07-08 | A kind of control method for improving anchor bar steel center portion abnormal structure |
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| CN106086352A CN106086352A (en) | 2016-11-09 |
| CN106086352B true CN106086352B (en) | 2018-03-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613841A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Revolving furnace continuous casting little square billet ultra-high strength and toughness tunnel supporting anchor rod steel and production method |
| CN102383048A (en) * | 2011-11-01 | 2012-03-21 | 莱芜钢铁集团有限公司 | Hot-rolled mining resin anchor rod reinforcing steel bar and production method thereof |
| CN102560248A (en) * | 2012-01-31 | 2012-07-11 | 首钢总公司 | Method for producing bolt steel |
| CN104451410A (en) * | 2014-12-18 | 2015-03-25 | 马钢(集团)控股有限公司 | Steel for 600MPa-level high-strength steel bars and thermal mechanical rolling method thereof |
-
2016
- 2016-07-08 CN CN201610539537.4A patent/CN106086352B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613841A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Revolving furnace continuous casting little square billet ultra-high strength and toughness tunnel supporting anchor rod steel and production method |
| CN102383048A (en) * | 2011-11-01 | 2012-03-21 | 莱芜钢铁集团有限公司 | Hot-rolled mining resin anchor rod reinforcing steel bar and production method thereof |
| CN102560248A (en) * | 2012-01-31 | 2012-07-11 | 首钢总公司 | Method for producing bolt steel |
| CN104451410A (en) * | 2014-12-18 | 2015-03-25 | 马钢(集团)控股有限公司 | Steel for 600MPa-level high-strength steel bars and thermal mechanical rolling method thereof |
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| CN106086352A (en) | 2016-11-09 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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