CN106001476B - A kind of method under the continuous dynamic weight of continuous casting billet two benches - Google Patents

A kind of method under the continuous dynamic weight of continuous casting billet two benches Download PDF

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Publication number
CN106001476B
CN106001476B CN201610551771.9A CN201610551771A CN106001476B CN 106001476 B CN106001476 B CN 106001476B CN 201610551771 A CN201610551771 A CN 201610551771A CN 106001476 B CN106001476 B CN 106001476B
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China
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pressure
stage
fan
withdrawal straightening
continuous casting
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CN201610551771.9A
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Chinese (zh)
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CN106001476A (en
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祭程
朱苗勇
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东北大学
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ

Abstract

The invention belongs to continuous casting field, and in particular to the method under a kind of continuous dynamic weight of continuous casting billet two benches.Features of the present invention for large square bland continuous-casting machine and wide thickness plate continuous casting machine, method under a kind of continuous dynamic weight of two benches is provided, the specific process parameter design method of process implementing under weight is given, includes selection, division and the design of drafts of pressure range.The present invention, which crosses pressure in the first stage, improves strand segregation defects, and the rarefaction defect of strand is improved in the lasting pressure of second stage, improves it is achieved thereby that strand segregation is synchronous with loose.

Description

A kind of method under the continuous dynamic weight of continuous casting billet two benches

Technical field

The invention belongs to continuous casting field, and in particular to the method under a kind of continuous dynamic weight of continuous casting billet two benches.

Background technology

Big cross section billet caster, Slab Caster can substitute conventional die castings, and production is tight to rolling reduction requirement The continuous casting billet of lattice, its recovery rate of iron can improve more than 10%, and energy consumption per ton steel can reduce by more than 25%, and uniformly steady with composition Calmly, the advantages of surface quality is good, can significantly improve the performance of big specification strand product.However, with casting blank cross-section size Increase, its internal cooling condition substantially deteriorates, and column trichite reaches in solidified structure, and interdendritic is rich in the remnants of solute segregation element Molten steel flow tends to balance, and causes strand segregation, loose and shrinkage cavity defect further serious.These defects are in follow-up heating, rolling During again be difficult to effectively elimination, so as to have impact on end product quality.

Solidification end soft reduction technique is to improve center segregation of casting blank and loose effective means, has become newly-built continuous casting The generally outfit technology of machine.Bloom solidification end slighter compress relies primarily on air cooling zone withdrawal straightening machine pressure and completed, the list of slighter compress Roller drafts is usually no more than 5mm, and pressure total amount is usually no more than 15mm.

However, with the increase of casting blank section, drafts is substantially reduced to the osmotic efficiency of strand center portion, conventional slighter compress Drafts solidification shrinkage can not be fully compensated.At the same time, casting blank solidification latter stage, casting billet surface is formd naturally with center portion Thermograde (up to more than 500 DEG C), if carrying out aximal deformation value pressure at this moment, drafts far surpasses to the osmotic efficiency of center portion Rough rolling process (rough rolling process strand is samming base) is crossed, so that soldering solidification shrinkage cavity is can reach, or even refinement center portion austenite crystal The technological effect of grain.According to this theory, a few countries have carried out improving upgrading to large square bland continuous-casting machine in the world, propose Solidification end weight Reduction Technology.Continuous casting billet solidifying end weight Reduction Technology can realize pressure more than total amount 25mm pressure, far More than the pressure total amount of slighter compress, so as to reach that soldering solidifies the technological effect of shrinkage cavity.

Current continuous casting billet solidifying end weight Reduction Technology realizes that for example Kawasaki, Japan iron is proposed using multiple technologies pattern Continuous Forging (continuous forging) technology of bloom solidification end, the technology passes through installs one in solidification end Continuous forging to strand is realized to chopping block, so as to improve strand center porosity.Nippon proposes NS Bloom Large Reduction Technology (Nippon Steel's bloom weight Reduction Technology), it in strand by just having solidified at position The convex roller of a pair of similar roughing mills is installed, the implementation under weight is realized.The POSharp technologies at South Korea Pu use fan-shaped section shape Formula completes the implementation under solidification end weight, and its pressure range is in fs=0.05-0.6 scopes, reduction ratio 5-20mm/m.In addition, The PCCS technologies of Sumitomo Metal Industries also carry out 10mm or so pressure using single roller, are descended with completing slab solidification end weight Journey.

The continuous forging technology of Kawasaki Steel, the bloom weight Reduction Technology of Nippon Steel and the PCCS skills of Sumitomo Metal Industries Art, is to complete the disposable implementation under weight in short-range using individual equipment, therefore it needs stronger equipment pressure Lower ability.Although the POSharp technologies at Pu are completed using fan-shaped segment structure, its fan-shaped section is also fixed form, is arranged on Fixed position.The depressing position that each heavy Reduction Technology is proposed is not quite similar, but does not provide particular location more.In fact, due to solidifying Gu end with pulling rate, steel grade, the degree of superheat, cross dimensions it is different and far from each other, therefore fixed position pressure obviously can not Process rationality is played to greatest extent.

The content of the invention

The problem of existing for prior art, the present invention provides the side under a kind of continuous dynamic weight of continuous casting billet two benches Method, it is therefore an objective to for large square bland continuous-casting machine and the features of Slab Caster, improves solidification end solute segregation with dredging Pine, lifts strand consistency.

Method under the continuous dynamic weight of continuous casting billet two benches of the present invention, described continuous casting billet is bloom, according to Lower step is carried out:

Depressed using n platform bloom continuous casting withdrawal straightening machines, wherein being bloom center solid rate at pressure start position The position of fs >=0.6, pressure terminal is that at strand inside center temperature and surface temperature difference≤200 DEG C position, bloom solidification is eventually Point is located between m platforms and m+1 platform withdrawal straightening machines;

Depressed from the pressure of First withdrawal straightening machine to the m-1 platform withdrawal straightening machines of pressure starting point for the first stage, control first Stage depresses overall reduction 10-20mm, and the first stage is in the incomplete resolidified region of bloom, and green shell is thick in this region Degree increases with the rear shifting away from crystallizer position, and meets square root law, thus each withdrawal straightening machine drafts R into progressively doubling The withdrawal straightening machine drafts of relation, i.e., i-th is a of the i-th -1 withdrawal straightening machine draftsiTimes:R2=a2·R1, R3=a3·R2, R4= a4·R3……Ri=ai·Ri-1, wherein i >=2, aiTake 1.2-2.0;

The pressure of last withdrawal straightening machine is depressed for second stage before from m platforms withdrawal straightening machine to pressure terminal, second stage Interior withdrawal straightening machine quantity >=2, every withdrawal straightening machine drafts >=5mm, second stage overall reduction 15-20mm, complete generous company Under the continuous dynamic weight of the two benches of strand.

Wherein, described bloom cross dimensions >=200mm × 200mm, bloom steel grade be medium carbon steel, high-carbon steel, in One kind in carbon alloy steel, high-carbon alloy steel.

Described withdrawal straightening machine is 5-12 platforms, and with long-range roll gap adjustable function, the maximum depression power of separate unit withdrawal straightening machine exists In the range of 18kN-20kN, maximum reduction >=5mm, the hydraulic system pressure for controlling withdrawal straightening machine is 18MPa-21MPa, when described Separate unit withdrawal straightening machine maximum reduction when being unable to reach 5mm, by 18-21MPa pressure pressed compacts.

Method under the continuous dynamic weight of the continuous casting billet two benches of the present invention, described continuous casting billet is wide and thick slab, according to Following steps are carried out:

It is wide and thick slab horizontal segment center solid rate fs >=0.6 at the fan-shaped section pressure start position of Slab Caster Position, using Coagulated hemothorax as the first stage pressure with second stage depress boundary, pressure terminal be strand inside center At temperature and surface temperature difference≤200 DEG C position, when Coagulated hemothorax falls in some fan-shaped section, the fan-shaped section presses second stage pressure Lower technique is performed, and outlet roll gap ensures the fan-shaped section reduction ratio >=4mm/m;

When carrying out first stage pressure, fan-shaped section reduction ratio is set as on 2-5mm/m, i.e. fan-shaped section length direction every meter 2-5mm is depressed, fan-shaped segment length is 2.0-2.5 meters, and single fan-shaped section drafts is 4mm-12.5mm;

When carrying out second stage pressure, fan-shaped section reduction ratio is set as 2-10mm/m, and single fan-shaped section drafts is Under fan-shaped segment number >=2 in 4mm-25mm, second stage, the continuous dynamic weight of two benches for completing wide and thick slab continuous casting billet.

Wherein, described wide and thick slab section thickness >=150mm, width >=1000mm, it is medium carbon steel, low-carbon to be applicable steel grade One kind in steel, peritectic steel, medium carbon alloy steel, low-carbon alloy steel.

When Slab Caster, which is limited to hydraulic system pressure, is unable to reach predetermined drafts, by the maximum of fan-shaped section Pressed compact ability pressed compact.

Compared with prior art, the features of the present invention and beneficial effect are:

In technical solution of the present invention, the determination of pressure terminal is based on when strand internal-external temperature difference is smaller, internal and external temperature ladder Degree has been not sufficient to ensure that casting billet surface drafts can be sufficiently transmitted to strand center portion, therefore pressure terminal is strand inside center temperature Degree and the temperature difference of centre of surface temperature are less than or equal at 200 DEG C of positions.

It is to be located at based on the first stage in the incomplete resolidified region of strand under the two benches weight of the present invention, now depresses energy Enough it is effectively improved strand segregation defects;Second stage is located at casting blank solidification terminal and is fully finished after solidification, is now pressed greatly Lower amount implements that strand internal-external temperature difference can be made full use of, and significantly improves center porosity, lifts strand consistency.

The present invention is continuously dynamic there is provided a kind of two benches for the features of large square bland continuous-casting machine and wide thickness plate continuous casting machine Method under weight, gives the specific process parameter design method of process implementing under weight, including pressure range selection, draw Point and drafts design.The present invention, which crosses pressure in the first stage, improves strand segregation defects, in continuing for second stage Pressure improves the rarefaction defect of strand, improves it is achieved thereby that strand segregation is synchronous with loose.

Brief description of the drawings

Fig. 1 is GCr15 bloom inside center temperature and centre of surface temperature variation in the embodiment of the present invention 1;

Fig. 2 be in the embodiment of the present invention 1 through the bloom under two benches weight with without the bloom under two benches weight Low power transverse section contrast picture;

Wherein:(a) without the bloom transverse section under two benches weight;(b) the present embodiment is through big under two benches weight Square billet transverse section;(c) transverse section of stocking is processed into without the bloom under two benches weight;(d) the present embodiment is through two benches Bloom under weight is processed into the transverse section of stocking;

Through the wide and thick slab under two benches weight and without the width under two benches weight in Fig. 3 embodiment of the present invention 2 Heavy slab is wide to low power transverse section comparison diagram at 1/4 position;

Wherein:(a) without the wide and thick slab transverse section under two benches weight;(b) the present embodiment is through under two benches weight Wide and thick slab transverse section.

Embodiment

Embodiment 1

There are 12 withdrawal straightening machine frames the large square bland continuous-casting machine of certain in the present embodiment cross dimensions 380mm × 490mm, air cooling zone, Using 0.45m/min pulling rate integral bearing steel GCr15 when, pressure starting point be located at 3# withdrawal straightening machines position at, in bloom inside Heart temperature and centre of surface temperature variation as shown in figure 1, as can be seen from Figure 1 pressure terminal be strand inside center temperature with At the position of surface temperature difference≤200 DEG C, i.e., at 9# withdrawal straightening machines, Coagulated hemothorax is located between 7# and 8# withdrawal straightening machine frames;

First stage pressure is 3#-6# withdrawal straightening machines, and second stage pressure is 7#-9# withdrawal straightening machines, each withdrawal straightening machine drafts point Cloth is as shown in the table.

Each withdrawal straightening machine drafts technique (mm) of table 1

Through the bloom under two benches weight picture is contrasted with the low power transverse section without the bloom under two benches weight As shown in Fig. 2 after being provided with the continuous dynamic weight of the two benches for as can be seen from Figure 2 implementing the present invention, strand central pipe Significantly improve, slab quality is greatly improved, be made into stocking center segregation after stocking and be substantially improved, strand and system Into the flaw detection qualification rate of bar be obviously improved.

Embodiment 2

Certain wide thickness plate continuous casting machine cross dimensions 280mm × 1800mm, horizontal segment is made up of 5 fan-shaped sections, i.e. 9#-13# Section.Fan-shaped segment length 2.1m, when producing Q345 with 0.85m/min pulling rate, Coagulated hemothorax is in 10# fan-shaped sections;

First stage pressure is 9# fan-shaped sections, and second stage pressure is 10#, 11# fan-shaped section, each fan-shaped section reduction settings As shown in table 2.

Each fan-shaped section drafts technique (mm) of table 2

The present embodiment through the wide and thick slab under two benches weight with without the wide and thick slab under two benches weight wide to 1/4 Low power transverse section comparison diagram at position is as shown in figure 3, as can be seen from Figure 3 work under the continuous dynamic weight of two benches of the invention Inner Quality of Billet is significantly improved after skill is implemented, and Line of Segregation is substantially eliminated, and greatly improves strand consistency.For 50mm Thick hot rolled plate less than 20% be promoted to 100% without rolling under rear heap cool condition flaw detection qualification rate by original.

Claims (6)

1. the method under a kind of continuous dynamic weight of continuous casting billet two benches, it is characterised in that described continuous casting billet is bloom, is pressed Carried out according to following steps:
Depressed using n platform bloom continuous casting withdrawal straightening machines, wherein pressure start position at be bloom center solid rate fs >= 0.6 position, pressure terminal is bloom Coagulated hemothorax position at strand inside center temperature and surface temperature difference≤200 DEG C position Between m platforms and m+1 platform withdrawal straightening machines;
Depressed from the pressure of First withdrawal straightening machine to the m-1 platform withdrawal straightening machines of pressure starting point for the first stage, control the first stage Depress overall reduction 10-20mm, the first stage be in bloom incomplete resolidified region in, in this region shell thickness with Increase away from the rear shifting of crystallizer position, and meet square root law, therefore the drafts R of each withdrawal straightening machine is closed into progressively multiplication System, i.e., i-th withdrawal straightening machine drafts is a of the i-th -1 withdrawal straightening machine draftsiTimes:R2=a2·R1, R3=a3·R2, R4=a4· R3……Ri=ai·Ri-1, wherein i >=2, aiTake 1.2-2.0;
The pressure of last withdrawal straightening machine is depressed for second stage before from m platforms withdrawal straightening machine to pressure terminal, is drawn in second stage Machine quantity >=2 are rectified, every withdrawal straightening machine drafts >=5mm, second stage overall reduction 15-20mm complete generous continuous casting billet The continuous dynamic weight of two benches under.
2. the method under a kind of continuous dynamic weight of continuous casting billet two benches according to claim 1, it is characterised in that described Bloom cross dimensions >=200mm × 200mm, bloom steel grade be medium carbon steel, high-carbon steel, medium carbon alloy steel, high carbon alloy One kind in steel.
3. the method under a kind of continuous dynamic weight of continuous casting billet two benches according to claim 1, it is characterised in that described Withdrawal straightening machine be 5-12 platforms, with long-range roll gap adjustable function, the maximum depression power of separate unit withdrawal straightening machine is in 18kN-20kN scopes It is interior, maximum reduction >=5mm, control withdrawal straightening machine hydraulic system pressure be 18MPa-21MPa, when described separate unit withdrawal straightening machine most When heavy reduction is unable to reach 5mm, by 18-21MPa pressure pressed compacts.
4. the method under a kind of continuous dynamic weight of continuous casting billet two benches, it is characterised in that described continuous casting billet is wide and thick slab, Follow the steps below:
It is the position of wide and thick slab horizontal segment center solid rate fs >=0.6 at the fan-shaped section pressure start position of Slab Caster Put, the boundary that pressure is depressed with second stage using Coagulated hemothorax as the first stage, pressure terminal is strand inside center temperature At the position of surface temperature difference≤200 DEG C, when Coagulated hemothorax falls in some fan-shaped section, the fan-shaped section depresses work by second stage Skill is performed, and outlet roll gap ensures the fan-shaped section reduction ratio >=4mm/m;
When carrying out first stage pressure, fan-shaped section reduction ratio is set as every meter of pressure on 2-5mm/m, i.e. fan-shaped section length direction 2-5mm, fan-shaped segment length is 2.0-2.5 meters, and single fan-shaped section drafts is 4mm-12.5mm;
When carrying out second stage pressure, fan-shaped section reduction ratio is set as 2-10mm/m, and single fan-shaped section drafts is 4mm- Under fan-shaped segment number >=2 in 25mm, second stage, the continuous dynamic weight of two benches for completing wide and thick slab continuous casting billet.
5. the method under a kind of continuous dynamic weight of continuous casting billet two benches according to claim 4, it is characterised in that described Wide and thick slab section thickness >=150mm, width >=1000mm, be applicable steel grade be medium carbon steel, mild steel, peritectic steel, middle carbon close One kind in Jin Gang, low-carbon alloy steel.
6. the method under a kind of continuous dynamic weight of continuous casting billet two benches according to claim 4, it is characterised in that work as width When Plate production is limited to hydraulic system pressure and is unable to reach predetermined drafts, it can be forced by the maximum pressed compact of fan-shaped section Base.
CN201610551771.9A 2016-07-14 2016-07-14 A kind of method under the continuous dynamic weight of continuous casting billet two benches CN106001476B (en)

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CN106670414A (en) * 2016-10-26 2017-05-17 首钢总公司 Set method of fixed segment depressing continuous caster depressing mode
CN106735026B (en) * 2016-12-09 2020-02-14 东北大学 Single-point and continuous heavy pressing process for solidification tail end of continuous casting billet
CN107081413B (en) * 2017-04-01 2019-08-09 唐山钢铁集团有限责任公司 The method for improving Steels for High Rise Buildings continuous casting billet central dense degree
CN107081412B (en) * 2017-04-01 2019-08-09 唐山钢铁集团有限责任公司 The preparation method of high-quality plastic die steel special heavy plate continuous casting mother's base
CN107243611B (en) * 2017-06-01 2019-01-11 东北大学 A kind of bloom continuous casting solidification end list roller depressing position determines method

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CN102921914A (en) * 2012-12-01 2013-02-13 新余钢铁集团有限公司 Heavy reduction technology for improving center segregation and center porosity of super-thick slabs
WO2015079639A1 (en) * 2013-11-29 2015-06-04 Jfeスチール株式会社 Method for manufacturing round billet
CN104858385A (en) * 2015-05-22 2015-08-26 中冶连铸技术工程有限责任公司 Light reduction or heavy reduction control method and device based on billet caster
CN104874758A (en) * 2015-05-11 2015-09-02 中冶连铸技术工程有限责任公司 Control method and device under continuous casting weight

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3671872B2 (en) * 2001-06-20 2005-07-13 住友金属工業株式会社 Continuous casting method of steel
CN102921914A (en) * 2012-12-01 2013-02-13 新余钢铁集团有限公司 Heavy reduction technology for improving center segregation and center porosity of super-thick slabs
WO2015079639A1 (en) * 2013-11-29 2015-06-04 Jfeスチール株式会社 Method for manufacturing round billet
CN104874758A (en) * 2015-05-11 2015-09-02 中冶连铸技术工程有限责任公司 Control method and device under continuous casting weight
CN104858385A (en) * 2015-05-22 2015-08-26 中冶连铸技术工程有限责任公司 Light reduction or heavy reduction control method and device based on billet caster

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