CN110181004A - A kind of detection method judging continuous casting and solidifying green shell according to dotted crack position - Google Patents
A kind of detection method judging continuous casting and solidifying green shell according to dotted crack position Download PDFInfo
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- CN110181004A CN110181004A CN201810382726.4A CN201810382726A CN110181004A CN 110181004 A CN110181004 A CN 110181004A CN 201810382726 A CN201810382726 A CN 201810382726A CN 110181004 A CN110181004 A CN 110181004A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
- B22D2/005—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the thickness of a frozen shell
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- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
The present invention relates to a kind of detection methods that continuous casting and solidifying green shell is judged according to dotted crack position, it is characterized by: having dotted crackle at zero ductility temperature on the sample of continuous casting square billet longitudinal direction after continuous casting square billet is using slighter compress, dotted crackle can reflect the thickness of solidified slab shell in secondary of pressure roller, green shell by completing each pressure roller to the judgement of square billet longitudinal direction sampling point shape crackle, measurement measures, and optimizes solidification and heat transfer model according to measurement result.The present invention is judged by the dotted crackle to square billet longitudinal direction sample, is measured, and the solidified shell of corresponding pressure roller is obtained, for optimizing Mathematical Model For Heat Transfer In Solidification, compared to traditional shoot-pin test, it is more convenient efficient, improvement direction is provided to steel products quality in kind is improved, cost is greatly reduced.
Description
Technical field
The invention belongs to metallurgy industry continuous casting and solidifying green shell detection technique fields, and in particular to a kind of according to dotted crackle position
Set the detection method for judging continuous casting square billet solidified shell.
Background technique
Currently, shoot-pin test is mainly taken in the detection of continuous casting and solidifying green shell.
For shoot-pin test from the 1990s, the solidified shell that domestic Large Steel ironworks are just commonly used to measurement slab is thick
Degree.Method of powder actuated shot is that the steel nail as tracer material is driven into the green shell solidified using nailing gun, then in slab corresponding positions
Sampling is set to be analyzed.Nailing gun is made of transmitting gun body, control cabinet, nail shooting pill and nailing etc., and nailing is ordinary carbon steel,
The groove that twice contain sulfide is machined on nail, in nailing into after people's casting blank liquid core, the sulfide of low melting point can be rapid
Diffusion, so continuous casting billet shell thickness can be measured according to the spread condition of sulfide with the method for acid attack and sufur printing, from
And determine the wick-containing thickness of slab.Method of powder actuated shot have the characteristics that measurement it is accurate, low in cost and can popularization it is strong, but experimental period
Length, data accuracy are poor.
Continuous casting process basic research at present mainly simulates parsing slab by establishing two-dimentional Mathematical Model For Heat Transfer In Solidification
Cooled and solidified process, but can digital-to-analogue be adapted with casting machine condition, processing parameter, steel grade etc., it is necessary to by surface temperature measurement,
Nailing, which is tested, determines coagulation factor to revise optimization.The maximum critical technological point of current Continuous Casting Soft Reduction tackling key problem is how to determine rationally
Depressing position, heavy dependence determines green shell concreting thickness to the slab nailing of process of setting, calculates coagulation factor, liquid core
Length, solidification end two-phase section solid rate.
If successfully developing the detection method for judging continuous casting and solidifying green shell according to dotted crack position, belong to judgement Continuous Casting Square
The important breakthrough of base solidification situation.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of to be sentenced according to dotted crack position for the above-mentioned prior art
The detection method of disconnected continuous casting square billet solidified shell, avoids prolonged field experiment, improves production efficiency, cost is greatly reduced,
Improve the quality in kind of square billet.
The present invention solves the above problems used technical solution are as follows: a kind of to judge continuous casting and solidifying according to dotted crack position
The detection method of green shell has dotted crackle at zero ductility temperature on the sample of continuous casting square billet longitudinal direction after continuous casting square billet is using slighter compress,
Dotted crackle can reflect the thickness of solidified slab shell in secondary of pressure roller, and by judging square billet longitudinal direction sampling point shape crackle, measurement is to complete
The green shell measurement of each pressure roller, optimizes solidification and heat transfer model according to measurement result.
Preferably, ladle is hung in into continuous caster turret:
1) envelope dummy ingot operation is carried out；
2) big tundish is used, centering water-coating port carries out centering；
3) covering agent in being added, uses suitable crystallizer protecting residue；
4) when square billet reaches zero ductility temperature, starting pressure roller is gently pressed, and then tracks the depressing conditions of each roller
And it is recorded；
5) longitudinal sample of certain length is taken to the square billet produced；
6) subdivision, milling face, bite are carried out to longitudinal sample；
7) the dotted crackle on longitudinal sample judged, measured；
8) position of the corresponding dotted crackle of each pressure roller is recorded；
9) according to the data-optimized Mathematical Model For Heat Transfer In Solidification obtained；
10) slighter compress technique is designed according to mathematical model calculated result, instructs actual production, improve quality in kind.
Preferably, square billet casting speed control in continuous casting process is controlled in 0.30m/min~0.6m/min, the degree of superheat at 20 DEG C
~60 DEG C；Using slighter compress, pressure total amount is 5~10mm.
Preferably, following procedure is specifically included when sealing dummy ingot operation:
1) start to block dummy ingot from 30min or more before continuous casting on molten steel；
2) crystallizer steel plate and dummy bar head are dried up；
It 3) will be in the gap of asbestos cord filling dummy bar head surrounding with copper pricker；
4) with mud rope dummy bar head surrounding gap sealing, intermediate position is suitably put by flat mud rope；Again uniformly in dummy bar head
On spread iron filings；
5) iron frame, reinforcing bar are put, it is desirable that reinforcing bar is placed in iron frame, and the ground square bar of center mouth of a river landing is 5 centimeters low；Middle part
Molten steel flows into dovetail groove when the appropriate stationary point gap in position is poured to open.
Preferably, underway water-coating port carries out specifically including following procedure when centering:
1) thermometric, sampling are carried out to the big packet of upper continuous casting, and commands driving big back stall on bale panoramic tables, commander
Driving is broken off relations, and ladle slide gate in billet oil cylinder loaded onto, oil cylinder safety plug is plugged, covers backpack cover, rise big packet arm；
2) it hires a car and is reached after casting position in, water-coating port centering, the good middle water-coating port decline of monitoring simultaneously in；
3) it packages long nozzle and opens argon flow in 600ppm；
4) handle is installed, stopper is fastened；
5) start to walk within the specified scope and in time lifting speed to standard pulling rate, if any abnormal pulling rate can higher than standard pulling rate,
It adjusts pulling rate again after thermometric, if big packet temperature is very high and middle packet cured effect is good, must slowly lift speed.
Preferably, geometric center is first found out to the sample removed, and to its sawing, sample thickness control is on the left side 100mm
The right side carries out milling surface treatment to the good sample of sawing, is then corroded with diluted 5% concentration sulfuric acid to sample, and take pictures.
Preferably, it identifies the dotted crackle of length≤1mm on longitudinal sample, its distance with respect to inner arcuate surface is surveyed
Amount, and make a record.
Compared with the prior art, the advantages of the present invention are as follows:
The present invention is judged by the dotted crackle to square billet longitudinal direction sample, is measured, and obtains the solidification base of corresponding pressure roller
Shell, it is more convenient efficient compared to traditional shoot-pin test for optimizing Mathematical Model For Heat Transfer In Solidification, it is real to steel products are improved
Amount of substance provides improvement direction, and cost is greatly reduced.
Specific embodiment
Present invention is further described in detail with reference to embodiments.
One of the present embodiment judges the detection method of continuous casting and solidifying green shell according to dotted crack position, is mainly used in
Continuous casting square billet has dotted crackle on the sample of continuous casting square billet longitudinal direction after using slighter compress, which appears in zero ductility temperature
Place, i.e. solid rate are that can reflect the thickness of solidified slab shell in secondary of pressure roller at 1.0.It is measured by the green shell to each pressure roller, it is excellent
Change solidification and heat transfer model, the internal soundness of continuous casting square billet is greatly improved after.To the judgement of square billet longitudinal direction sampling point shape crackle, survey
Amount, shown in table 1.
Table 1 depresses the corresponding dotted crack position of roller
| Dotted crackle | Position/mm |
| Point 1 | 113.75 |
| Point 2 | 119.17 |
| Point 3 | 130.00 |
| Point 4 | 140.83 |
It specifically includes: ladle is hung in into continuous caster turret:
(1) envelope dummy ingot operation is carried out.
1. starting to block dummy ingot from 30min or more before continuous casting on molten steel.
2. drying up crystallizer steel plate and dummy bar head, it is ensured that copper plate of crystallizer, dummy bar head, dummy ingot material are dry.
3. will be in the gap of asbestos cord filling dummy bar head surrounding with copper pricker, it is necessary to tamp, fill and lead up, especially dovetail groove is oblique
Wave.
4. intermediate position is suitably put by flat mud rope with mud rope dummy bar head surrounding gap sealing, directly rushed to prevent molten steel
The molten damage dummy bar head on dummy bar head.Uneven, crude, crack the place of dummy bar head, it is necessary to not fallen by flat with anticreep with mud rope
Dummy ingot.Iron filings are uniformly spread on dummy bar head again.
5. putting iron frame, reinforcing bar, it is desirable that reinforcing bar is placed in iron frame, and the ground square bar of center mouth of a river landing is 5 centimeters low；Middle part
Molten steel flows into dovetail groove when the appropriate stationary point gap in position is poured to open.
(2) big tundish is used, centering water-coating port carries out centering.
1. carrying out thermometric, sampling to the big packet of upper continuous casting, pouring continuous casting on time the first furnace must thermometric.And command driving handle
Big back stall is on bale panoramic tables, commander's driving is broken off relations, and ladle slide gate in billet oil cylinder is loaded onto, oil cylinder safety plug is plugged,
Backpack cover is covered, big packet arm is risen；
It hires a car and is reached after casting position in 2., assistance captain water-coating port centering, the good middle water-coating port decline of monitoring simultaneously in,
Necessary every stream someone is wrapped in drop guards anti-waterstop port top to cold item.
3. packaging long nozzle opens argon flow 600ppm (argon flow < 500ppm has sound-light alarm).,
4. installing handle, stopper is fastened.Big packet is opened pour after, whether water-coating port from opening in inspection, and that opens certainly must first open, steel
Flow control is appropriate, prevents tied or excessive steel.
5. any section open pour all be according to control of section molten steel flow and start-up time, within the specified scope starting and and
Shi Tila speed is to standard pulling rate.If any exception, (middle packet and mouth of a river cured effect are poor, liquid steel temperature is low, molten steel heating or middle packet are opened
Pour waiting for a long time) pulling rate can be higher than standard pulling rate, adjust pulling rate again after thermometric.If big packet temperature is very high and middle packet baking is imitated
Fruit is good, then must slowly lift speed.
(3) covering agent in being added, uses suitable crystallizer protecting residue.
1. forbidding fishing out slag, forbidding being stirred in crystallizer with oxygen lance in casting process.
2. covering slag will spare no effort in casting process, overlay even, black top of the slag operation less, forbid molten steel occur exposed.Dismounting
Plug rod mechanism oil cylinder, emergency gate oil cylinder.Get out raw and auxiliary material: crystallizer protecting residue, coverture, metal stool etc..Normally pour
There is four people monitoring when steel, around crystallizer.
(4) typical casting speed control is in 0.30m/min~0.6m/min, and typical degree of superheat control is at 20 DEG C~60 DEG C；It uses
Slighter compress, pressure total amount are 5~10mm.It is required that base head clicks the slighter compress button that comes into operation (side at this time after having crossed third platform withdrawal straightening machine
Base surface reaches zero ductility temperature, i.e. solid rate is at 1.0), it then tracks the depressing conditions of each roller and is recorded.
(5) longitudinal sample of 500mm long is taken to the square billet produced.
(6) subdivision, milling face, bite are carried out to longitudinal sample.Geometric center is first found out to the sample removed, and to it
Sawing, sample thickness are controlled in 100mm or so, milling surface treatment are carried out to the good sample of sawing, then with diluted 5% concentration sulphur
Acid corrodes sample, and takes pictures.
(7) the dotted crackle on longitudinal sample judged, measured.It identifies that length≤1mm on longitudinal sample is dotted to split
Line measures its distance with respect to inner arcuate surface, and makes a record.
(8) position of the corresponding dotted crackle of each pressure roller is recorded.According to the data recorded, it is divided
Analysis, the implementation of three steel grades such as table 1.
The dotted crack position of 1 three steel grades of table
(9) according to the data-optimized Mathematical Model For Heat Transfer In Solidification obtained.According to the shell thickness amendment solidification estimated
Heat transfer model calculated value accomplishes fining adjustment computation model.
(10) slighter compress technique is designed according to mathematical model calculated result, instructs actual production, improve quality in kind.
The foregoing is merely a kind of preferable implementations of the invention, are not intended to limit the invention, all in this hair
Non-essential modification, replacement, improvement for being made in bright spirit etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of detection method for judging continuous casting and solidifying green shell according to dotted crack position, it is characterised in that: make in continuous casting square billet
With there is dotted crackle after slighter compress on the sample of continuous casting square billet longitudinal direction at zero ductility temperature, dotted crackle can reflect the solidification base of pressure roller
Thickness of the shell, the green shell by completing each pressure roller to the judgement of square billet longitudinal direction sampling point shape crackle, measurement measures, according to measurement
Result optimizing solidification and heat transfer model.
2. a kind of detection method for judging continuous casting and solidifying green shell according to dotted crack position according to claim 1, special
Sign is: ladle is hung in into continuous caster turret:
1) envelope dummy ingot operation is carried out；
2) big tundish is used, centering water-coating port carries out centering；
3) covering agent in being added, uses suitable crystallizer protecting residue；
4) when square billet reaches zero ductility temperature, starting pressure roller is gently pressed, and the depressing conditions for then tracking each roller are gone forward side by side
Row record；
5) longitudinal sample of certain length is taken to the square billet produced；
6) subdivision, milling face, bite are carried out to longitudinal sample；
7) the dotted crackle on longitudinal sample judged, measured；
8) position of the corresponding dotted crackle of each pressure roller is recorded；
9) according to the data-optimized Mathematical Model For Heat Transfer In Solidification obtained；
10) slighter compress technique is designed according to mathematical model calculated result, instructs actual production, improve quality in kind.
3. a kind of detection method for judging continuous casting and solidifying green shell according to dotted crack position according to claim 2, special
Sign is: square billet casting speed control in continuous casting process is controlled in 0.30m/min~0.6m/min, the degree of superheat at 20 DEG C~60 DEG C；
Using slighter compress, pressure total amount is 5~10mm.
4. a kind of detection method for judging continuous casting and solidifying green shell according to dotted crack position according to claim 2, special
Sign is: following procedure is specifically included when sealing dummy ingot operation:
1) start to block dummy ingot from 30min or more before continuous casting on molten steel；
2) crystallizer steel plate and dummy bar head are dried up；
It 3) will be in the gap of asbestos cord filling dummy bar head surrounding with copper pricker；
4) with mud rope dummy bar head surrounding gap sealing, intermediate position is suitably put by flat mud rope；It is uniformly spread on dummy bar head again
Iron filings；
5) iron frame, reinforcing bar are put, it is desirable that reinforcing bar is placed in iron frame, and the ground square bar of center mouth of a river landing is 5 centimeters low；Intermediate position is suitable
When stationary point gap is poured to open, molten steel flows into dovetail groove.
5. a kind of detection method for judging continuous casting and solidifying green shell according to dotted crack position according to claim 2, special
Sign is: underway water-coating port carries out specifically including following procedure when centering:
1) thermometric, sampling are carried out to the big packet of upper continuous casting, and commands driving big back stall on bale panoramic tables, commander's driving
Break off relations, and ladle slide gate in billet oil cylinder loaded onto, oil cylinder safety plug is plugged, covers backpack cover, rise big packet arm；
2) it hires a car and is reached after casting position in, water-coating port centering, the good middle water-coating port decline of monitoring simultaneously in；
3) it packages long nozzle and opens argon flow in 600ppm；
4) handle is installed, stopper is fastened；
5) it starts to walk within the specified scope and lifting speed, can be to be measured higher than standard pulling rate if any abnormal pulling rate to standard pulling rate in time
Wen Houzai adjusts pulling rate, if big packet temperature is very high and middle packet cured effect is good, must slowly lift speed.
6. a kind of detection method for judging continuous casting and solidifying green shell according to dotted crack position according to claim 2, special
Sign is: first finding out geometric center to the sample removed, and to its sawing, sample thickness is controlled in 100mm or so, to sawing
Good sample carries out milling surface treatment, is then corroded with diluted 5% concentration sulfuric acid to sample, and take pictures.
7. a kind of detection method for judging continuous casting and solidifying green shell according to dotted crack position according to claim 2, special
Sign is: identifying the dotted crackle of length≤1mm on longitudinal sample, measures to its distance with respect to inner arcuate surface, and do
Record easy to remember.
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| CN201810382726.4A CN110181004B (en) | 2018-04-26 | 2018-04-26 | Detection method for judging continuous casting solidified blank shell according to point crack positions |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112475254A (en) * | 2020-10-28 | 2021-03-12 | 东北大学 | Method and device for controlling pulling speed and casting strip thickness of thin strip continuous casting machine |
| CN112765535A (en) * | 2020-12-10 | 2021-05-07 | 江阴兴澄特种钢铁有限公司 | Method for calculating solid phase rate of continuous casting roller row position |
| CN112784367A (en) * | 2020-12-10 | 2021-05-11 | 江阴兴澄特种钢铁有限公司 | Method for calculating thickness of blank shell at position of continuous casting roller row and solidification tail end of casting machine |
| CN113145812A (en) * | 2021-04-01 | 2021-07-23 | 东北大学 | Method for optimizing flow of continuous casting transient molten steel |
| CN114088503A (en) * | 2021-11-19 | 2022-02-25 | 中天钢铁集团有限公司 | Method for verifying accuracy of secondary cooling solidification model |
| CN114871400A (en) * | 2022-06-13 | 2022-08-09 | 中天钢铁集团有限公司 | Continuous casting solidification process determination method based on single-roller pressing operation and application thereof |
| CN117272761A (en) * | 2023-11-21 | 2023-12-22 | 北京科技大学 | Method and system for monitoring middle cracks of bloom |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112475254A (en) * | 2020-10-28 | 2021-03-12 | 东北大学 | Method and device for controlling pulling speed and casting strip thickness of thin strip continuous casting machine |
| CN112765535A (en) * | 2020-12-10 | 2021-05-07 | 江阴兴澄特种钢铁有限公司 | Method for calculating solid phase rate of continuous casting roller row position |
| CN112784367A (en) * | 2020-12-10 | 2021-05-11 | 江阴兴澄特种钢铁有限公司 | Method for calculating thickness of blank shell at position of continuous casting roller row and solidification tail end of casting machine |
| CN112765535B (en) * | 2020-12-10 | 2024-04-19 | 江阴兴澄特种钢铁有限公司 | Continuous casting roller array position solid phase rate calculation method |
| CN113145812A (en) * | 2021-04-01 | 2021-07-23 | 东北大学 | Method for optimizing flow of continuous casting transient molten steel |
| CN114088503A (en) * | 2021-11-19 | 2022-02-25 | 中天钢铁集团有限公司 | Method for verifying accuracy of secondary cooling solidification model |
| CN114871400A (en) * | 2022-06-13 | 2022-08-09 | 中天钢铁集团有限公司 | Continuous casting solidification process determination method based on single-roller pressing operation and application thereof |
| CN114871400B (en) * | 2022-06-13 | 2024-02-27 | 中天钢铁集团有限公司 | Continuous casting solidification process judging method based on single-roll pressing operation and application thereof |
| CN117272761A (en) * | 2023-11-21 | 2023-12-22 | 北京科技大学 | Method and system for monitoring middle cracks of bloom |
| CN117272761B (en) * | 2023-11-21 | 2024-04-26 | 北京科技大学 | Method and system for monitoring middle cracks of bloom |
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