CN107442756B - The method for improving slab slighter compress efficiency - Google Patents
The method for improving slab slighter compress efficiency Download PDFInfo
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- CN107442756B CN107442756B CN201710601785.1A CN201710601785A CN107442756B CN 107442756 B CN107442756 B CN 107442756B CN 201710601785 A CN201710601785 A CN 201710601785A CN 107442756 B CN107442756 B CN 107442756B
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- slighter compress
- section
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- slab
- roll
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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
Abstract
The invention discloses a kind of methods for improving slab slighter compress efficiency, including measure to the continuous casting machine roll-gap, according to measurement result by 0 section -2 sections of roll gap precision controlling in the range of-the 0.5 to 0mm of the first setting value；The continuous casting machine roll-gap is measured, 1 section of roll gap precision before 3 sections-slighter compress is controlled according to measurement result；The continuous casting machine roll-gap is measured, is controlled according to roll gap precision of the measurement result to the section for implementing slighter compress, the section for implementing slighter compress is 2 or 3；The continuous casting machine roll-gap is measured, 1 section of -14 sections of roll gap precision after slighter compress are controlled according to measurement result.The method provided by the invention for improving slighter compress efficiency, efficiently solves the limited disadvantage of traditional slighter compress technique reduction ratio, central segregation of slab is improved, while reducing the generation of underbead crack, so that end product quality is significantly improved.
Description
Technical field
The present invention relates to iron and steel smelting technology field, in particular to a kind of method for improving slab slighter compress efficiency.
Background technique
Slighter compress technique is one of control most effective means of central segregation of slab, and principle is to solidify end at slab center
Additional pressure is given in end mushy zone, smashes the crystal boundary at this and puts up a bridge, makes the concentrated phase liquid-phase reflux of solute element, and supplement
Solidification shrinkage at this, so as to improve center segregation and it is loose the defects of.
But the raising with client to Require for Steel Material, especially high-grade pipe line steel, medium carbon alloy steel and high-strength steel
Requirement of the equal steel grades to central segregation of slab is also more stringent.As shown in Figure 1, wherein 1-1 is solidification Bear-grudge shell, 1-2 is center liquid
Phase region, 1-3 are light depression force, and 1-4 inner arc roller, 1-5 is slab trigonum, and 1-6 is outer arc roller, due to current slighter compress work
Skill drafts is limited, when reduction ratio is more than 1.2mm/m, in the position of slab trigonum 1-5 and close slab trigonum 1-5
The probability that portion's crackle occurs significantly increases, and analyzing its reason is mainly, slab trigonum 1-5 and attached when slab reaches slighter compress section
Close molten steel solidifies completely, and deflection when pressure at this is limited, and depressing force mainly acts at this, when drafts is excessive
When this at most easily it is cracked.
Therefore, traditional soft reduction technique has been unable to meet the demand to the demanding high-end product of center segregation.How
The pressure efficiency for improving slighter compress technique, had not only guaranteed the control requirement of center segregation, but also was avoided that underbead crack is this
Secondary technical research emphasis.
Summary of the invention
The embodiment of the present application solves traditional in the prior art by providing a kind of method for improving slab slighter compress efficiency
The limited disadvantage of slighter compress technique reduction ratio, improves central segregation of slab, while reducing the generation of underbead crack.
In order to solve the above technical problems, the present invention provides a kind of methods for improving slab slighter compress efficiency, comprising:
Before conticaster is opened and poured, the ingredient of cast steel grade, casting specification, pulling rate are input to the conticaster simulation and poured
In casting system, the position of solidification end mushy zone in the conticaster casting process is determined, record the position of slighter compress reduction section
Parameter and pressure range length；
The continuous casting machine roll-gap is measured, is set 0 section -2 sections of roll gap precision controlling first according to measurement result
In the range of-the 0.5 of definite value to 0mm；
The continuous casting machine roll-gap is measured, according to measurement result by the roll gap precision control of 1 section before 3 sections-slighter compress
System is in the range of the 0 to+0.5mm of the second setting value；
The continuous casting machine roll-gap is measured, the roll gap precision controlling for implementing the section of slighter compress is existed according to measurement result
In the range of-the 0.5 to 0mm of third setting value, the section for implementing slighter compress is 2 or 3；
The continuous casting machine roll-gap is measured, according to measurement result by 1 section of -14 sections of roll gap precision controlling after slighter compress
In the range of ± the 0.5mm of the 4th setting value.
Further, the method for the raising slab slighter compress efficiency, further includes:
The continuous casting machine roll-gap adjusted is measured again and is veritified.
Further, first setting value is a fixed value.
Further, second setting value is a fixed value.
Further, the third setting value is a fixed value.
Further, the 4th setting value is a fixed value.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
The application by the control to roll gap, make solidified shell when reaching slighter compress section the interior big face of outer arc form it is slight
Bulge, slighter compress can preferably act on center solid-liquid two-phase region at this time, improve the efficiency of slighter compress, while reduce to three
The pressure of angular region solidified shell effectively prevents the generation of the position underbead crack, and this method is easy to operate, does not need to equipment
It is transformed, to being promoted, slab mass effect is obvious.
Detailed description of the invention
Fig. 1 is the pressure process schematic in conventional slighter compress technique.
Fig. 2 is the flow diagram of the method for the raising slab slighter compress efficiency that the embodiment of the present application one provides.
Fig. 3 is the pressure process schematic in the method for the raising slab slighter compress efficiency that the embodiment of the present application one provides.
Specific embodiment
The present invention provides a kind of methods for improving slighter compress efficiency, and efficiently solving traditional slighter compress technique reduction ratio has
The shortcomings that limit, improves central segregation of slab, while reducing the generation of underbead crack, so that end product quality obtains significantly
It is promoted.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
Embodiment one
As shown in Fig. 2, the embodiment of the present application provides a kind of method for improving slab slighter compress efficiency, comprising:
Step S1: before conticaster is opened and poured, the ingredient of cast steel grade, casting specification, pulling rate are input to conticaster mould
In quasi- casting system, the position of solidification end mushy zone in conticaster casting process is determined, record the position of slighter compress reduction section
Parameter and pressure range length；
Step S2: measuring continuous casting machine roll-gap, according to measurement result by 0 section -2 sections of roll gap precision (practical roll gap
Value-standard gap values between rollers) control is in the range of-the 0.5 to 0mm of the first setting value, wherein the first setting value is a fixed value.
Step S3: measuring continuous casting machine roll-gap, according to measurement result to 1 section of roll gap precision before 3 sections-slighter compress
It is controlled, control range is in the range of the 0 to+0.5mm of the second setting value, wherein the second setting value is a fixed value.
Step S4: measuring continuous casting machine roll-gap, will implement the roll gap precision control of the section of slighter compress according to measurement result
For system in the range of-the 0.5 to 0mm of third setting value, the section for implementing slighter compress is 2 or 3；Wherein third setting value is
One fixed value.
Step S5: measuring continuous casting machine roll-gap, according to measurement result to 1 section of -14 sections of roll gap precision after slighter compress
It is controlled, by 1 section of -14 sections of roll gap precision controlling after slighter compress in the range of the ± 0.5mm of the 4th setting value, wherein the
Four setting values are a fixed value.
Step S6: measuring continuous casting machine roll-gap adjusted again and veritify, if roll gap precision is not up to above-mentioned mark
Standard veritified again after needing to be adjusted according to step S3-S5, is required in step S3-S5 until veritifying result and reaching
Roll gap precision.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1, in order to control the bulge deformation of slab initial solidification shell, continuous casting machine roll-gap is measured, according to measurement result pair
The roll gap precision of the 0-2 section after crystallizer uses the mode relatively tightened to be controlled out, and control range is in the first setting value -0.5
To between 0mm, being conducive to reduce bulge deformation amount of the big face of interior outer arc at both sides, after slab goes out the 2nd section near leptoprosopy
Green shell solidifies substantially, and has reached certain intensity.
2, continuous casting machine roll-gap is measured, 1 section of roll gap precision before 3 sections-slighter compress is used according to measurement result
Looser mode is controlled, and for control range between the second setting value 0 to+0.5mm, this stage uses more loose roll gap
Mode is conducive to slab center and generates certain bulge there are the green shell of liquid phase, is greater than the thickness of slab center
Edge position.
3, continuous casting machine roll-gap is measured, the roll gap precision controlling of the section of slighter compress will be implemented according to measurement result
In the range of-the 0.5 to 0mm of three setting values, the section for implementing slighter compress is 2 or 3；This stage is using the roller more tightened
Slit die formula indirectly improves the effective drafts of slighter compress technique, simultaneously because has been produced from leading portion gap preset slab center
Raw bulge, three can both be reduced with useful effect in green shell of the slab center position with wick-containing by increasing drafts at this time
The risk that angular region position is cracked since pressure is excessive, while can increase effective pressure of wick-containing position, reduce center segregation.
4, continuous casting machine roll-gap is measured, according to measurement result to 1 section of -14 sections of roll gap precision after slighter compress use compared with
Controlled for loose mode, by 1 section of -14 sections of roll gap precision controlling after slighter compress the 4th setting value ± 0.5mm
In range, this stage slab solidifies completely, in order to extend equipment life in this stage using loose roll gap mode.
The application forms solidified shell 1 slightly in the interior big face of outer arc when reaching slighter compress section by the control to roll gap
Bulge, as shown in figure 3, wherein 3-1 be second solidification Bear-grudge shell, 3-2 be the second center liquid phase region, 3-3 be the second slighter compress pressure
It exerts oneself, 3-4 the second inner arc roller, 3-5 is the second slab trigonum, and 3-6 is the second outer arc roller, and the second slighter compress is depressed at this time
Power 3-3 can preferably act on the second center solid-liquid two-phase region 3-2, improve the efficiency of slighter compress, while reducing to second
The pressure of slab trigonum 3-5, effectively prevents the generation of the position underbead crack, and this method is easy to operate, does not need to setting
Standby to be transformed, to being promoted, slab mass effect is obvious.
Embodiment two
Test casting steel grade is high-grade pipe line steel X70, and main component is shown in Table 1, and conticaster is double-current sheet billet continuous casting
Machine, can pour section is 230mm × (900-1600) mm, this 6 furnace of casting altogether.Simulation casting, slab section are first carried out before pouring
For 230mm × 1100mm, pulling rate 1.3m/min, learn that solidification end solid-liquid two-phase region is located at away from meniscus according to analog result
18.22-21.79m position, reduction section is at 8,9 sections.
The roll gap for the different sections that conticaster 2 flows is adjusted by said new method according to simulation Cast parameters, 1 stream uses
Conventional roll gap control technique.
Roll gap is flowed to conticaster 2 using roll gap meter to measure, according to measurement result to casting machine roll gap by following requirement into
Row is control as follows；
0 section -2 sections of roll gap precision, which is pressed, controls adjustment within the scope of-the 0.5 to 0mm of the first setting value；
3 sections -7 sections of roll gap precision is adjusted according to 0 to+0.5mm scope control of the second setting value；
8-9 sections of roll gap precision are adjusted according to -0.5 to 0mm scope control of third setting value；
10-14 sections of roll gap precision are adjusted according to control within the scope of the ± 0.5mm of the 4th setting value.
Final roll gap is adjusted, and the results are shown in Table 2.
1 stream, 2 streams are cast by normal process after the completion of roll gap adjustment, the of each heat double fluid in casting process
Two blocks of slabs take coarse micro-grain sample, analyze internal soundness, and the results are shown in Table 3 for analysis.
Table 1 tests steel grade main component/%
Practical roll gap situation/mm after the stream adjustment of 2 conticaster 2 of table
| Position | It is left | It is right |
| 0 section of entrance | 0.1 | 1 |
| 0 section of outlet | -0.3 | -0.4 |
| 1 section of entrance | -0.3 | -0.3 |
| 1 section of outlet | -0.2 | -0.1 |
| 2 sections of entrances | -0.2 | -0.3 |
| 2 sections of outlets | 0 | -0.3 |
| 3 sections of entrances | 0.2 | 0.4 |
| 3 sections of outlets | 0.1 | 0 |
| 4 sections of entrances | 0.5 | 0.3 |
| 4 sections of outlets | 0 | 0.2 |
| 5 sections of entrances | 0.4 | 0.1 |
| 5 sections of outlets | 0.3 | 0.3 |
| 6 sections of entrances | 0.2 | 0.5 |
| 6 sections of outlets | 0.1 | 0.1 |
| 7 sections of entrances | 0 | 0.3 |
| 7 sections of outlets | 0.3 | 0.5 |
| 8 sections of entrances | -0.4 | -0.3 |
| 8 sections of outlets | 0 | -0.2 |
| 9 sections of entrances | -0.1 | -0.3 |
| 9 sections of outlets | -0.5 | -0.5 |
| 10 sections of entrances | 0.3 | 0 |
| 10 sections of outlets | 0.1 | 0.4 |
| 11 sections of entrances | -0.2 | 0 |
| 11 sections of outlets | -0.1 | 0.3 |
| 12 sections of entrances | -0.3 | 0.2 |
| 12 sections of outlets | -0.4 | -0.1 |
| 13 sections of entrances | -0.5 | -0.4 |
| 13 sections of outlets | -0.3 | 0.1 |
| 14 sections of entrances | 0.4 | 0.1 |
| 14 sections of outlets | -0.3 | -0.1 |
3 slab internal soundness situation of table
It should be noted that only can be only achieved the application under the control condition for meeting the aforementioned all steps of the present invention
Technical effect to be achieved.The application mainly improves slighter compress technique by controlling the roll gap precision of different location fan-shaped section
Pressure efficiency, improve center segregation, while reducing underbead crack, by the application of above method, enable to produce
High-grade pipe line steel, high-strength steel and medium carbon alloy steel central segregation of slab C class≤1.0 grade (rating scale GB/T226- out
2015) ratio reaches 96% or more, and the underbead cracks such as middle crack, triangular area crack are all controlled at 1.0 grades or less.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (6)
1. a kind of method for improving slab slighter compress efficiency characterized by comprising
Before conticaster is opened and poured, the ingredient of cast steel grade, casting specification, pulling rate are input to the conticaster simulation casting system
In system, the position of solidification end mushy zone in the conticaster casting process is determined, record the location parameter of slighter compress reduction section
With pressure range length；
The continuous casting machine roll-gap is measured, according to measurement result by 0 section -2 sections of roll gap precision controlling in the first setting value
- 0.5 to 0mm in the range of；
The continuous casting machine roll-gap is measured, 1 section of roll gap precision controlling before 3 sections-slighter compress is existed according to measurement result
In the range of the 0 to+0.5mm of second setting value；
The continuous casting machine roll-gap is measured, the roll gap precision controlling of the section of slighter compress will be implemented in third according to measurement result
In the range of-the 0.5 of setting value to 0mm, the section for implementing slighter compress is 2 or 3；
The continuous casting machine roll-gap is measured, according to measurement result by 1 section of -14 sections of roll gap precision controlling after slighter compress
In the range of ± the 0.5mm of four setting values.
2. improving the method for slab slighter compress efficiency as described in claim 1, which is characterized in that further include:
The continuous casting machine roll-gap adjusted is measured again and is veritified.
3. improving the method for slab slighter compress efficiency as described in claim 1, it is characterised in that:
First setting value is a fixed value.
4. improving the method for slab slighter compress efficiency as described in claim 1, it is characterised in that:
Second setting value is a fixed value.
5. improving the method for slab slighter compress efficiency as described in claim 1, it is characterised in that:
The third setting value is a fixed value.
6. improving the method for slab slighter compress efficiency as described in claim 1, it is characterised in that:
4th setting value is a fixed value.
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| CN112264594B (en) * | 2020-08-27 | 2021-11-05 | 邯郸钢铁集团有限责任公司 | Control method for improving control precision of opening degree under soft press of continuous casting fan-shaped section |
| CN114472821A (en) * | 2020-11-13 | 2022-05-13 | 上海梅山钢铁股份有限公司 | Calibration method for opening degree of streamline roll gap in continuous casting of plate blank |
| CN114054707A (en) * | 2021-10-11 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for reducing center segregation of pipeline steel continuous casting billet |
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