CN102601331A - Method for improving center segregation of extra thick slab with thickness of 400mm - Google Patents

Method for improving center segregation of extra thick slab with thickness of 400mm Download PDF

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Publication number
CN102601331A
CN102601331A CN2011104080980A CN201110408098A CN102601331A CN 102601331 A CN102601331 A CN 102601331A CN 2011104080980 A CN2011104080980 A CN 2011104080980A CN 201110408098 A CN201110408098 A CN 201110408098A CN 102601331 A CN102601331 A CN 102601331A
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segregation
drafts
extra
optimum
depressing
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CN102601331B (en
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甄新刚
朱志远
蒋海涛
李景光
王玉龙
白占禄
宋征
赵晶
孙博
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Shougang Group Co Ltd
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Shougang Corp
Qinhuangdao Shouqin Metal Materials Co Ltd
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Abstract

The invention relates to a method for improving center segregation of an extra thick slab with a thickness of 400mm, and belongs to the technical field of continuous casting of steelmaking. Degree of the center segregation of the extra thick slab with the thickness of 400mm is improved by a dynamic soft reduction technology, so that rating of the center segregation is free from above C2.0 so as to improve the inner quality of the extra thick slab. The specific steps are as follows: determining an optimal reduction position and an optimal rolling reduction: after determining the optimal reduction position, testing different rolling reductions in the reduction area: 5-6mm and 6-8mm and applying a certain rolling reduction of 0-0.5mm to a solid phase area; and combining lower power rating and C, S segregation ratios to determine the optimal rolling reduction.

Description

A kind of method of improving 400mm extra-thick plate blank center segregation
Technical field
The invention belongs to the steel-making continuous casting technical field, a kind of method of the 400mm of improvement extra-thick plate blank center segregation particularly is provided.
Background technology
The formation reason and the harm of cut deal base center segregation; Many documents have been done detailed elaboration: think that column crystal " solidifies bridging " and the slab bulge is the main cause that forms center segregation, use and dynamically gently depress the center segregation that technology can effectively be controlled strand; But the above extra-thick plate blank of relevant 400mm is dynamically gently depressed Study on Technology seldom.In the 400mm extra-thick plate blank was produced, still there was tangible segregated zone in the centre, be necessary to adopt dynamically gently to depress technology and alleviate its segregation degree, and at present domestic to the high-quality extra-thick plate blank of this thickness specification can not be for reference experience.
Summary of the invention
The object of the present invention is to provide a kind of method of the 400mm of improvement extra-thick plate blank center segregation; Through dynamically gently depressing the center segregation degree that technology is improved the 400mm extra-thick plate blank; Make the center segregation grading stop to occur the above grade of C2.0, thereby improve the internal soundness of extra-thick plate blank.Concrete processing step is:
(1) confirms optimum depressing position:, generally use the solid rate f of two-phase section point for depressing position sExpression, f s=(T 1-T)/(T 1-T S), T wherein 1Be liquidus temperature, ℃; T SBe solidus temperature, ℃; T is a two-phase section point temperature, ℃.To the 400mm extra-thick plate blank, under identical working condition, adopt identical drafts, set different depressing positions: f s=0.2-0.92, f s=0.05-1.0 gets the strand sample respectively and carries out acidleach low power grading, and drill hole sampling carries out C, S chemical analysis, calculates corresponding segregation ratio, ins conjunction with low power grading and C, S segregation ratio, confirms the depressing position of optimum.
(2) confirm optimum drafts: after optimum depressing position is confirmed; In this pressure range, test different drafts: 5-6mm, 6-8mm, and apply certain drafts: 0-0.5mm in solid phase area; In conjunction with low power grading and C, S segregation ratio, confirm optimum drafts.
Drill hole sampling method (see figure 1) of the present invention is to get 5,10,5 steel cuttings with the drill bit of diameter 8mm respectively at the thickness 1/2 and 1/4 place at width of plate slab 1/4,1/2 and 3/4 place; Carry out C, S chemical analysis, obtain two kinds of C, S segregation ratios of gently depressing scheme respectively.
Description of drawings
Fig. 1 gets the bits sketch map for boring.The drill hole sampling method is to get 5,10,5 steel cuttings with the drill bit of diameter 8mm respectively at the thickness 1/2 and 1/4 place at width of plate slab 1/4,1/2 and 3/4 place, carries out C, S chemical analysis, obtains two kinds of C, S segregation ratios of gently depressing scheme respectively.
Fig. 2 is the extra-thick plate blank acidleach macrograph of scheme number 1.
Fig. 3 is the extra-thick plate blank acidleach macrograph of scheme numbers 2.
Fig. 4 gently depresses scheme C, S distribution situation for difference.
The specific embodiment
Fig. 1 gets the bits sketch map for boring.The drill hole sampling method is to get 5,10,5 steel cuttings with the drill bit of diameter 8mm respectively at the thickness 1/2 and 1/4 place at width of plate slab 1/4,1/2 and 3/4 place, carries out C, S chemical analysis, obtains two kinds of C, S segregation ratios of gently depressing scheme respectively.
(1) to the medium carbon steel of 400mm thickness specification, be example, design two groups and gently depress testing program with Q345DH, slab specifications section 400 * 2400mm, table 1 is gently depressed parameter for different schemes, and table 2 is the average assay of test heat.When Fig. 2, Fig. 3 gently depress scheme for adopting difference, the acidleach macrograph of extra-thick plate blank, through perusal, the segregation situation of discovery scheme 2 is quite a lot of, and there is not tangible segregated zone in the centre of slab.
(2) through drill hole sampling; Calculate two groups of C, S segregation ratios of gently depressing test; As shown in Figure 4; Gently depress C, the S segregation of scheme 2 and compare, show that in conjunction with the acidleach low power result who tests slab the pattern of gently depressing of employing scheme 2 more helps improving the center segregation of 400mm thickness medium carbon steel all less than scheme 1.
(3) therefore, specifications section is the Q345DH steel of 400 * 2400mm, and the optimum parameter of gently depressing is: two-phase section depressing position f s=0.05-1.0; Two-phase section drafts 7mm, solid phase area drafts 0.5mm.
Table 1 is gently depressed parameter
Figure BSA00000632550000021
Table 2 test steel grade Q345DH chemical composition (wt%)
Figure BSA00000632550000022

Claims (2)

1. a method of improving 400mm extra-thick plate blank center segregation is characterized in that, processing step is:
(1) confirms optimum depressing position: for the solid rate f of depressing position with the two-phase section point sExpression, f s=(T 1-T)/(T 1-T S), T wherein 1Be liquidus temperature, ℃; T SBe solidus temperature, ℃; T is a two-phase section point temperature, ℃; To the 400mm extra-thick plate blank, under identical working condition, adopt identical drafts, set different depressing positions: f s=0.2-0.92, f s=0.05-1.0 gets the strand sample respectively and carries out acidleach low power grading, and drill hole sampling carries out C, S chemical analysis, calculates corresponding segregation ratio, ins conjunction with low power grading and C, S segregation ratio, confirms the depressing position of optimum;
(2) confirm optimum drafts: after optimum depressing position is confirmed; In this pressure range, test different drafts: 5-6mm, 6-8mm, and apply certain drafts: 0-0.5mm in solid phase area; In conjunction with low power grading and C, S segregation ratio, confirm optimum drafts.
2. the method for improving 400mm extra-thick plate blank center segregation according to claim 1; It is characterized in that; Described drill hole sampling method is to get 5,10,5 steel cuttings with the drill bit of diameter 8mm respectively at the thickness 1/2 and 1/4 place at width of plate slab 1/4,1/2 and 3/4 place; Carry out C, S chemical analysis, obtain two kinds of C, S segregation ratios of gently depressing scheme respectively.
CN201110408098.0A 2011-12-09 2011-12-09 Method for improving center segregation of extra thick slab with thickness of 400mm Active CN102601331B (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN103128247A (en) * 2013-03-15 2013-06-05 北京科技大学 Method for producing 60 mm extra-thick steel plates with low compression ratio
CN103611903A (en) * 2013-12-11 2014-03-05 首钢总公司 Continuous casting manufacturing process of ultra-thick slabs for hydropower station pressure vessel steel
CN105002437A (en) * 2015-07-02 2015-10-28 首钢总公司 Production method of acid-resistant submarine pipeline steel low in yield ratio
CN103600049B (en) * 2013-11-29 2016-04-27 南京钢铁股份有限公司 A kind of technique controlling and improve mould steel continuous casting heavy slab internal soundness
CN105839002A (en) * 2016-05-30 2016-08-10 内蒙古包钢钢联股份有限公司 Continuous casting process for bainite steel billet
CN107790662A (en) * 2017-10-16 2018-03-13 首钢集团有限公司 A kind of method and device for controlling central segregation of slab
CN110523937A (en) * 2019-09-06 2019-12-03 首钢集团有限公司 A kind of reduction method and device
CN111215592A (en) * 2020-02-21 2020-06-02 东北大学 Heavy rail steel continuous casting billet segregation defect inheritance research method and application thereof
CN112371937A (en) * 2020-10-30 2021-02-19 五矿营口中板有限责任公司 Method for improving center segregation of peritectic steel of ultra-thick plate blank
CN112453342A (en) * 2020-10-30 2021-03-09 五矿营口中板有限责任公司 Method for improving center segregation of low-carbon steel of ultra-thick plate blank
CN112605358A (en) * 2020-10-30 2021-04-06 五矿营口中板有限责任公司 Method for improving high-carbon steel center segregation of ultra-thick plate blank
CN114433802A (en) * 2020-10-30 2022-05-06 五矿营口中板有限责任公司 Method for improving center segregation of medium carbon steel of ultra-thick plate blank

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KR100822413B1 (en) * 2006-10-26 2008-04-16 주식회사 포스코 Soft reduction unit using slab of segregation forecast method for casting center segregation of slab with soft reduction unit rolling heayy plate
CN102189237A (en) * 2008-12-30 2011-09-21 内蒙古包钢钢联股份有限公司 System integration technology for dynamic soft reduction of continuously-cast billet
CN101642774A (en) * 2009-09-15 2010-02-10 邢台钢铁有限责任公司 GCr15 bearing steel bloom continuous casting dynamic soft reduction process
JP2011224583A (en) * 2010-04-16 2011-11-10 Jfe Steel Corp Method for determining centerline segregation of continuously cast slab

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN103128247A (en) * 2013-03-15 2013-06-05 北京科技大学 Method for producing 60 mm extra-thick steel plates with low compression ratio
CN103600049B (en) * 2013-11-29 2016-04-27 南京钢铁股份有限公司 A kind of technique controlling and improve mould steel continuous casting heavy slab internal soundness
CN103611903A (en) * 2013-12-11 2014-03-05 首钢总公司 Continuous casting manufacturing process of ultra-thick slabs for hydropower station pressure vessel steel
CN105002437A (en) * 2015-07-02 2015-10-28 首钢总公司 Production method of acid-resistant submarine pipeline steel low in yield ratio
CN105002437B (en) * 2015-07-02 2017-11-10 首钢总公司 A kind of production method of low yield strength ratio acid-resisting submerged pipeline steel
CN105839002A (en) * 2016-05-30 2016-08-10 内蒙古包钢钢联股份有限公司 Continuous casting process for bainite steel billet
CN107790662B (en) * 2017-10-16 2021-01-15 首钢集团有限公司 Method and device for controlling center segregation of plate blank
CN107790662A (en) * 2017-10-16 2018-03-13 首钢集团有限公司 A kind of method and device for controlling central segregation of slab
CN110523937A (en) * 2019-09-06 2019-12-03 首钢集团有限公司 A kind of reduction method and device
CN110523937B (en) * 2019-09-06 2021-07-23 首钢集团有限公司 Pressing method and device
CN111215592B (en) * 2020-02-21 2020-11-17 东北大学 Heavy rail steel continuous casting billet segregation defect inheritance research method and application thereof
CN111215592A (en) * 2020-02-21 2020-06-02 东北大学 Heavy rail steel continuous casting billet segregation defect inheritance research method and application thereof
CN112371937A (en) * 2020-10-30 2021-02-19 五矿营口中板有限责任公司 Method for improving center segregation of peritectic steel of ultra-thick plate blank
CN112453342A (en) * 2020-10-30 2021-03-09 五矿营口中板有限责任公司 Method for improving center segregation of low-carbon steel of ultra-thick plate blank
CN112605358A (en) * 2020-10-30 2021-04-06 五矿营口中板有限责任公司 Method for improving high-carbon steel center segregation of ultra-thick plate blank
CN114433802A (en) * 2020-10-30 2022-05-06 五矿营口中板有限责任公司 Method for improving center segregation of medium carbon steel of ultra-thick plate blank

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Address after: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei

Co-patentee after: Shougang Group Co. Ltd.

Patentee after: Qinhuangdao Shouqin Metal Material Co., Ltd.

Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei

Co-patentee before: Capital Iron & Steel General Company

Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd.

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Effective date of registration: 20190410

Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

Patentee after: Shougang Group Co. Ltd.

Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei

Co-patentee before: Shougang Group Co. Ltd.

Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd.