CN103894572B - A kind of continuous casting billet preprocess method - Google Patents
A kind of continuous casting billet preprocess method Download PDFInfo
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- CN103894572B CN103894572B CN201410141738.XA CN201410141738A CN103894572B CN 103894572 B CN103894572 B CN 103894572B CN 201410141738 A CN201410141738 A CN 201410141738A CN 103894572 B CN103894572 B CN 103894572B
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Abstract
The present invention relates to a kind of continuous casting billet preprocess method, belong to field of metal preparation.Processing method of the present invention is, after continuous casting billet solidifies completely；Cooled process, continuous casting billet surface be internally formed thermograde after；It is compressed deformation, obtains the continuous casting material of high-compactness.The present invention is the internal and external temperature gradient utilizing or manufacturing continuous casting billet after a kind of innovative continuous casting billet solidifies, and uses the technique that little pressure carries out pretreatment to continuous casting billet.After using this process to process, the defect such as continuous casting billet center porosity is substantially eliminated such that it is able to meet following process and finished product for the highest prescription of continuous casting billet.
Description
Technical field
The invention belongs to metal material field, be that processing method depressed in advance by a kind of continuous casting billet, be specifically related to continuous casting steel billet and exist
Strand center pressure densification method after cooling twice.
Background technology
Along with countries in the world industrial expansion and the progress of science and technology, the design of bridge boats and ships, engineering machinery and structure is day by day
Developing towards lightweight, maximization, the direction of high parameter, this just requires that Industrial Steels material has the highest quality and property
Energy.Along with the development of high-efficient continuous casting technology, the impact of following process and end properties is more paid attention to by continuous casting billet quality.
Continuous casting steel defect and follow-up differentiation have two features: be first that defect has heritability, in the most serious
Heart shrinkage cavity, the metallurgical imperfection such as loose can entail steel from continuous casting billet, entail structural member from steel again, become a kind of potential
Genetic disruption defect；Secondly, defect has expansion, and on continuous casting billet, a lot of internal flaws can expand in rolling and drawing in deformation
Spread becomes serious underbead crack, causes product to sentence immanent cause that is useless or that become inefficacy.In tradition casting process, according to steel grade
And the secondary water-cooling process that casting blank specification formulation is different, to improve the defects such as the loose of strand center and segregation, but effect is general.
Another be wick-containing depress (or soft pressure) technology, it be give under the conditions of continuous casting billet center is in liquid or semisolid little
Deformation, to reduce the defects such as segregation and center porosity.In terms of the document announced, wick-containing pressure still cannot solve in big blank
The problems such as heart segregation, loose, shrinkage cavity.Therefore, improve continuous casting billet production technology further, thus farthest in the continuous casting stage
Reduce, eliminate strand internal flaw, improve continuous casting billet quality, become a useful person offer good basis for following process, to finally promoting steel
Efficient, the long-life of material and safe handling are significant.
Summary of the invention
The technical problem to be solved in the present invention is, in prior art, continuous casting internal defects of steel is difficult to control to, thus affects
Following process is become a useful person the problem of quality；The present invention provides a kind of continuous casting billet pretreating process, in the blank after this PROCESS FOR TREATMENT
The heart is loose and segregation phenomena is substantially mitigated or eliminated, and effectively eliminates central pipe, lays good basis for following process.
For achieving the above object, the present invention takes following technical scheme:
The present invention relates to a kind of continuous casting billet preprocess method, its technical process is: molten steel → continuous casting → strand is complete
Solidify → cool down → depress in advance.
A kind of continuous casting billet preprocess method, described processing method is, after continuous casting billet solidifies completely；Cooled process, even
Casting billet surface be internally formed thermograde after；It is compressed deformation, obtains the continuous casting material of high-compactness.
The preferred version of above-mentioned continuous casting billet preprocess method is, continuous casting material state after cooling is, the surface of blank
Temperature is 850 ~ 1000 DEG C, and the temperature within blank is more than 1150 DEG C.
The preferred version of above-mentioned continuous casting billet preprocess method is, described compress variation is 5 ~ 15%.
The preferred version of above-mentioned continuous casting billet preprocess method is, described compression is 1 deformation or 2 shuntings time changes
Shape.
The preferred version of above-mentioned continuous casting billet preprocess method is, described in be cooled to cooling twice, Forced water cooling or aligned
One in heat exchange between roller stock in journey.
The preferred version of above-mentioned continuous casting billet preprocess method is, described compression can be on pony rougher, oil pressure or hydraulic press
Complete.
The preferred version of above-mentioned continuous casting billet preprocess method is, when described cooling processes, strand symmetrical surface has identical
Rate of cooling.
Further, strand heart portion should be kept after solidification to be in the condition of high temperature, but avoid the occurrence of wick-containing or solid-liquid mixing.
Further, in subsequent compression deformation process, the core of most of steel grade strands is in δ-Fe and γ-Fe
Two-phase section, plasticity is poor, if reaching this kind of differential temperature effect in cooling twice section, it should be noted that the cooling of upper district and the water of lower district cooling
Amount, cooling rate coordinate, and to reach to reduce the purpose of the crack sensitivity of central part in deformation after unloading, and make outer arc surface in strand
There is identical rate of cooling.
Further, in technique scheme, described casting blank surface temperature is 850 ~ 1000 DEG C.If surface temperature mistake
Low, strand process of rising again is violent, and core temperature reduces, and deformation after unloading pressure increases.
Further, in technique scheme, described drafts is 5% ~ 15%, and drafts is excessive poor in heart portion plasticity
Time be easily generated crackle, too small, rarefaction defect pressing can not be made；
The reason using above-mentioned pre-pressure processing method is as follows: owing to being difficult to take into account for different steel grade routine continuous casting process
Reduce centre burst sensitivity and alleviate two problems of internal flaw further；The present invention uses solidification strand at internal and external temperature ladder
Small deformation under degree state, it is to avoid the high temperature strand center poor deformation defect caused of plasticity, the center porosity of strand, internal micro-
See loose, cavity can pressing under stress effect, centre burst will not be produced simultaneously, and alleviate alloy by deformation and recrystallization
The segregation of element.
The present invention is the internal and external temperature gradient utilizing or manufacturing continuous casting billet after a kind of innovative continuous casting billet solidifies, and uses little pressure
Under continuous casting billet is carried out pretreatment technique.After using this process to process, the defect such as continuous casting billet center porosity is substantially disappeared
Remove such that it is able to meet following process and finished product for the highest prescription of continuous casting billet.
Accompanying drawing explanation
Fig. 1 is strand cross section macrostructure photo after embodiment 1 processes；
Fig. 2 is that after embodiment 1 processes, strand cross section macro defect indicates photo；
Fig. 3 is conventional continuous casting billet cross section macrostructure photo；
Fig. 4 is that conventional continuous casting billet cross section macro defect indicates photo；
Fig. 5 is blank surface microstructure picture after embodiment 2 processes；
Fig. 6 is microstructure picture at strand 1/2 radius after embodiment 2 processes；
Fig. 7 is strand center microstructure picture after embodiment 2 processes；
Fig. 8 is conventional continuous casting billet top layer microstructure picture；
Fig. 9 is microstructure picture at conventional continuous casting billet 1/2 radius；
Figure 10 is conventional continuous casting billet center microstructure picture.
Detailed description of the invention
Embodiment uses the mass percent chemical composition of steel billet as shown in table 1, and surplus is Fe.
The chemical composition (mass percent) of table 1 embodiment
| C% | Si/% | Mn/% | Cr/% | Mo/% | P% | S% |
| 0.32~0.40 | 0.17~0.37 | 0.40~0.70 | 0.90~1.20 | 0.45~0.55 | ≤0.035 | ≤0.030 |
Embodiment 1
Preform surface temperature is to begin to cool down process when 1250 DEG C, and cooling technique is cooling twice, and cool time is 36s,
Continuous casting billet surface be internally formed thermograde, its Preform surface temperature is 800 DEG C, and blank internal temperature is 1250 DEG C；Enter
Row compression, blank on milling train once deflection be 5%, its rate of deformation is 0.5m s-1；Finally give after pretreatment
Blank, its blank diameter is 105 mm, and its center porosity number is 35, and General Loosen number is 11
Embodiment 2
Preform surface temperature is to begin to cool down process when 1300 DEG C, and cooling technique is Forced water cooling, and cool time is 25s,
Continuous casting billet surface be internally formed thermograde, its Preform surface temperature is 900 DEG C, and blank internal temperature is 1250 DEG C；Enter
Row compression, a blank deflection on a hydraulic press is 10%, and its rate of deformation is 1m s-1；Finally give after pretreatment
Blank, its blank diameter is 110 mm, and its center porosity number is 30, and General Loosen number is 10.
Embodiment 3
Preform surface temperature is to begin to cool down process when 1150 DEG C, and cooling technique is Forced water cooling, and cool time is 15s,
Continuous casting billet surface be internally formed thermograde, its Preform surface temperature is 1000 DEG C, and blank internal temperature is 1250 DEG C；Enter
Row compression, blank carries out twice time deformation on milling train, and the deflection of the first passage is 8%, and the deflection of the second passage is
7%, total deformation is 15%, and its rate of deformation is 0.5m s-1；Finally giving blank after pretreatment, its blank diameter is 115
Mm, its center porosity number is 38, and General Loosen number is 11.
Embodiment 4
Preform surface temperature is to begin to cool down process when 1250 DEG C, and cooling technique is secondary water-cooled, and cool time is 35s,
Its Preform surface temperature is 950 DEG C, without compression, finally gives the blank after directly cooling, and its blank diameter is 120
Mm, its center porosity number is 46, and General Loosen number is 40.
The process technological parameter that embodiment uses is as shown in table 2.Embodiment 1 cross section macroscopic view disk sample macrostructure and circle
Spot defect and skin dark stain are as depicted in figs. 1 and 2.It will be seen that the strand cross section after pre-pressure processes has a small amount of center porosity
Occurring with General Loosen, initial point shape shrinkage porosite and skin dark stain on the contrast whole cross section of conventional treatment strand significantly reduce, through statistics, in
Number of loosening the heart reduces 17 ~ 35%, General Loosen quantity minimizing 73 ~ 75%.Conventional treatment strand is due also to solidify uneven generation
Cavity.Embodiment Defect Comparison is shown in Table 3.
After embodiment 2 and conventional treatment by the light micrograph of casting billet surface to center as shown in Fig. 5 ~ 7 and Fig. 8 ~ 10,
Conventional treatment strand all can be observed the Micro porosity of diameter 1 ~ 50 m from a surface to center, the most intensive with center distribution,
And it can be seen that significantly along crystal boundary dead color segregation, enriched alloying element herein is described.And the strand after pressure processes in advance
Microscopic structure from a surface to center does not observes Micro porosity and along cyrystal boundary segregation, illustrates that this type of defect is during pre-pressure
Being eliminated, slab quality is the most excellent.
The process technique of table 2 embodiment
| Numbering | Process type | Begin to cool down temperature/DEG C | Cooling termination surface temperature/DEG C | Cooling termination heart portion temperature/DEG C | Cool time/s | Depress drafts/% in advance |
| 1 | Pre-pressure processes 1 | 1250 | 800 | 1250 | 36 | 5 |
| 2 | Pre-pressure processes 2 | 1250 | 900 | 1250 | 25 | 10 |
| 3 | Pre-pressure processes 3 | 1250 | 1000 | 1250 | 15 | 15 |
| 4 | Conventional treatment | 1250 | 950 | 1250 | 35 | 0 |
The Defect Comparison of table 3 embodiment
| Numbering | Process type | General Loosen/ | Center porosity/ | Interior void/ | Residual hole | Center segregation/grade | Microscopic segregation | Microporosity |
| 1 | Pre-pressure processes 1 | 11 | 35 | Nothing | Nothing | Nothing | Nothing | Nothing |
| 2 | Pre-pressure processes 2 | 10 | 30 | Nothing | Nothing | Nothing | Nothing | Nothing |
| 3 | Pre-pressure processes 3 | 11 | 38 | Nothing | Nothing | Nothing | Nothing | Nothing |
| 4 | Conventional treatment | 40 | 46 | 2 | Nothing | Nothing | Have | Have |
Claims (5)
1. a continuous casting billet preprocess method, it is characterised in that described processing method is, after continuous casting billet solidifies completely；Cooled
Process, continuous casting billet surface be internally formed thermograde after；It is compressed deformation, obtains the continuous casting material of high-compactness；Institute
State and be cooled in cooling twice or straightening process the one in heat exchange between roller stock；After cooling processes, the surface temperature of blank is
850～1000 DEG C, the internal solid-state for temperature more than 1150 DEG C of blank.
A kind of continuous casting billet preprocess method the most according to claim 1, it is characterised in that described compress variation be 5～
15%.
A kind of continuous casting billet preprocess method the most according to claim 1, it is characterised in that described compression is 1 passage
Deformation or the deformation of 2 passages.
A kind of continuous casting billet preprocess method the most according to claim 1, it is characterised in that described in be compressed in pony rougher or liquid
Complete on press.
A kind of continuous casting billet preprocess method the most according to claim 1, it is characterised in that when described cooling processes, strand
Symmetrical surface has identical rate of cooling.
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| CN201410141738.XA CN103894572B (en) | 2014-04-10 | 2014-04-10 | A kind of continuous casting billet preprocess method |
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| CN103894572B true CN103894572B (en) | 2016-09-07 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3946792A (en) * | 1972-12-05 | 1976-03-30 | Concast Ag | Method of operating a continuous casting installation with compensation of deviations in water vapor pressure |
| JPH10128512A (en) * | 1996-10-28 | 1998-05-19 | Sumitomo Metal Ind Ltd | Unsolidified reduction rolling method for round billet |
| US5832985A (en) * | 1994-10-20 | 1998-11-10 | Mannesmann Aktiengesellschaft | Process and device for producing a steel strip with the properties of a cold-rolled product |
| JP2000317582A (en) * | 1999-05-14 | 2000-11-21 | Sumitomo Metal Ind Ltd | Method for continuously casting beam blank |
| CN1331616A (en) * | 1998-12-22 | 2002-01-16 | Sms德马格股份公司 | Method of producing round billets |
| CN1449314A (en) * | 2000-08-26 | 2003-10-15 | Sms迪马格股份公司 | Continuous casting installation comprising a soft reduction section |
-
2014
- 2014-04-10 CN CN201410141738.XA patent/CN103894572B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3946792A (en) * | 1972-12-05 | 1976-03-30 | Concast Ag | Method of operating a continuous casting installation with compensation of deviations in water vapor pressure |
| US5832985A (en) * | 1994-10-20 | 1998-11-10 | Mannesmann Aktiengesellschaft | Process and device for producing a steel strip with the properties of a cold-rolled product |
| JPH10128512A (en) * | 1996-10-28 | 1998-05-19 | Sumitomo Metal Ind Ltd | Unsolidified reduction rolling method for round billet |
| CN1331616A (en) * | 1998-12-22 | 2002-01-16 | Sms德马格股份公司 | Method of producing round billets |
| JP2000317582A (en) * | 1999-05-14 | 2000-11-21 | Sumitomo Metal Ind Ltd | Method for continuously casting beam blank |
| CN1449314A (en) * | 2000-08-26 | 2003-10-15 | Sms迪马格股份公司 | Continuous casting installation comprising a soft reduction section |
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