EP2656946A1 - Procédé d'amélioration de la capacité d'auto-alimentation d'ébauche de coulée à profil épais - Google Patents

Procédé d'amélioration de la capacité d'auto-alimentation d'ébauche de coulée à profil épais Download PDF

Info

Publication number
EP2656946A1
EP2656946A1 EP11851813.3A EP11851813A EP2656946A1 EP 2656946 A1 EP2656946 A1 EP 2656946A1 EP 11851813 A EP11851813 A EP 11851813A EP 2656946 A1 EP2656946 A1 EP 2656946A1
Authority
EP
European Patent Office
Prior art keywords
casting blank
heavy section
self
enhancing
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11851813.3A
Other languages
German (de)
English (en)
Other versions
EP2656946A4 (fr
Inventor
Dianzhong LI
Yikun LUAN
Paixian FU
Lijun Xia
Yiyi LI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institute of Metal Research of CAS
Original Assignee
Institute of Metal Research of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Institute of Metal Research of CAS filed Critical Institute of Metal Research of CAS
Publication of EP2656946A1 publication Critical patent/EP2656946A1/fr
Publication of EP2656946A4 publication Critical patent/EP2656946A4/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/06—Special casting characterised by the nature of the product by its physical properties
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • 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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D30/00—Cooling castings, not restricted to casting processes covered by a single main group

Definitions

  • the present invention relates to the fields of manufacturing of casting blanks, such as wide and thick metal slabs, round/square/rectangular heavy section casting blanks, and in particular to a method for enhancing the self-feeding ability of a heavy section casting blank, and eliminating the shrinkage voids and the surface cracks of the casting blank.
  • Wide and thick slabs have been widely applied in economic construction.
  • a great amount of wide and thick slabs are used in large-sized ships, ocean platforms, hydroelectric generating sets, thermal power generating units, pressure containers, dies, and long-distance pipelines. Therefore, there are huge demands on thick-large section wide and thick slabs for rolling the wide and thick plates.
  • the maximum thicknesses of the continuous casting slabs all are smaller than 400mm. If the continuous casting slabs are adopted to roll the wide and thick plates with a thickness of 200mm, it is difficult to ensure the performance of the core due to a small reduction ratio.
  • the mold casting method or electroslag remelting method for producing the wide and thick slabs has the disadvantages of low productivity, low success ratio, and high cost.
  • the heavy section round continuous casting blank is used for replacing the common molded steel ingots, which shows a good development trend due to high production efficiency and high material utilization ratio.
  • the heavy section casting blank can be used for producing nuclear torches, wind-power rings, and bond axis type of parts related to vehicles, ships and machines.
  • the continuous casting technology has been more and more applied in production of the heavy section casting blanks. This technology is as follows: continuously pour the liquid metal into a water cooling crystallizer, solidify the liquid steel in the water cooling crystallizer, and continuously cast the solidified part out from the lower end through a dummy bar to realize continuous casting of the blanks.
  • This technology also has defects: the height-diameter ratio of the casting blank produced by this technology is large, so realization of axis feeding of the casting blanks is difficult, and it is easy to cause shrinkage and porosity of the centre of thecast blanks; moreover, the outer surface of the blank is usually processed with a forced-cooling process, which causes an extremely low temperature to the outer surface and results in cracks. Those defects limit the development of the round continuous casting blanks to the bigger section size ( ⁇ 800mm).
  • the square and rectangular heavy section continuous casting blanks with a thickness of over 400mm also have the macro defects of inner shrinkage, porosity, and surface cracks.
  • a larger feeder head or a thermal-insulating (heating) feeder head is adopted to realize sequential solidification of the blanks along the gravity direction.
  • the feeder head ratio of the heavy section continuous casting blank is very small, and the height-diameter ratio thereof is bigger than 4, so the axial gravity feeding of the casting blank cannot be realized.
  • the inner shrinkage, porosity, and surface cracks of the heavy section casting blanks are technical bottlenecks that limit the development of the casting blanks towards the bigger section sizes.
  • enhancing the feeding ability of the heavy section casting blanks in the solidification process is of key importance for overcoming the defects of the inner shrinkage and porosity and surface crack of the heavy section casting blanks.
  • the aim of the present invention is to provide a method for eliminating the centre shrinkage, porosity, and surface cracks of heavy section molded wide and thick slabs and round and rectangular continuous casting blanks through enhancing the self-feeding ability of the heavy section casting blank. Therefore, it is beneficial to develop technologies for manufacturing round casting blanks with a diameter of over 500mm and square or rectangular casting blanks with a thickness of over 400mm.
  • control the cooling conditions of the outer surface of the casting blank to keep the outer surface of the casting blank at a temperature of 200 ⁇ 400°C below solidus, which makes the solidified layer of the outer surface of the casting blank stay in the plastic deformation region with a low deformation resistance.
  • a thermal insulating material or a heat cover to insulate the outer surface of the casting blank to reduce the intensity of heat exchange between the outer surface of the casting blank and the environment; then the temperature of the outer surface of the casting blank rises because of the latent heat in the casting blank core which reducing the radial temperature gradient of the casting blank, and then the core of the casting blank forms the mushy region and is solidified synchronously.
  • the casting blank surface and the casting blank core are still in the high temperature state; at this time, de-mold at the high temperature, wherein the de-molding temperature required by the casting blank is higher than 800°C.
  • the de-molding temperature required by the casting blank is preferably 850-1,200°C.
  • the method for enhancing the self-feeding ability of a heavy section casting blank is applicable to square or rectangular casting blanks with a thickness of over 400mm, round casting blanks with a diameter of over 500mm, and molded wide and thick slabs with a thickness of over 600mm.
  • the present invention quickly solidify and crust the outer surface of the casting blank to increase the strength and prevent surface crack at first, and then perform thermal insulation on the casting blank surface such that large area of the core forms the mushy region and that the solidified layer of the casting blank surface is maintained at a relatively high temperature to facilitate realization of the plastic deformation, thus realizing synchronous solidification and solid-phase movement in the subsequent solidification and shrinkage processes of the casting blank, fulfilling the aim of radial self-feeding of the high-temperature deformable metal, eliminating the inner shrinkage and surface crack of the casting blank, obviously eliminating the inner shrinkage of the casting blank.
  • the present invention is applicable to the heavy section metal castings, in particular to the round and square heavy section casting blanks which have a large height-diameter ratio and cannot eliminate axis shrinkage pipe through the feeder head.
  • the present invention provides a method for eliminating inner shrinkage, porosity and surface cracks by enhancing the self-feeding ability of a heavy section casting blank, comprising the following steps:
  • the method provided by the present invention is adopted to produce the molded wide and thick slab; the material of the wide and thick slab is Q345; the thickness of the wide and thick slab is 1,000mm, and the total mass is 60 tons.
  • An electric arc furnace is used to melt the liquid steel; then the liquid steel is refined in an LF furnace and next poured into the VD furnace for deoxidization and degassing.
  • the liquid steel is poured into a separated water-cooling mold in a total time period of 30 min.
  • the thickness of the solidified layer of the surface of the wide and thick slab is 90mm 40min after pouring. At this time, reduce the water flow of the water-cooling mold and increase the gap between the mold and the width and thick slab to reduce the speed of heat dissipation on the surface of the width and thick slab.
  • the surface temperature of the wide and thick slab rises from 920°C to 1,100°C-1,250°C and then the casting blank is gradually cooled until totally solidified. After the casting blank is completely solidified, de-mold at a high temperature of 900°C, and slowly cool after de-molding with a speed controlled to be 30-40°C/h.
  • Figure 1 shows a wide and thick slab produced in this embodiment. Through non-destructive inspection, it is found that the slab has no defect of inner shrinkage avoid and surface cracks.
  • the method provided by the present invention is adopted to produce the heavy section round continuous casting blank; the material of the round blank is 20CrNi2Mo; the diameter is 1,000mm; the length is 8m; and the total mass of the round blank is 45 tons.
  • Figure 2(a) shows the heavy section round casting blank produced by the technology of the present invention in this embodiment. Through non-destructive inspection, it is found that the blank has no inner shrinkage void and the casting blank surface has no cracking defect.
  • Figure 2(b) shows the cross section of the round blank without centralized shrinkage voids in centre and with a porosity level of below 2.
  • Figure 3(a) shows the round casting blank which is not produced by the technology provided by the present invention and has the same size and specification.
  • the centre of the round blank has shrinkage voids in a large area and the porosity defect, as shown in figure (3b ).
  • the present invention enables a large area of the blank centre to form the mushy region and meanwhile maintains the solidified layer of the casting blank surface at a relatively high temperature, thus realizing the plastic movement of the solid phase in the subsequent solidification processes, fulfilling the aim of radial self-feeding of the high-temperature deformable metal, eliminating the inner shrinkage and porosity of the casting blank, and preventing surface crack.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP11851813.3A 2010-12-23 2011-06-30 Procédé d'amélioration de la capacité d'auto-alimentation d'ébauche de coulée à profil épais Withdrawn EP2656946A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2010106042601A CN102161090B (zh) 2010-12-23 2010-12-23 一种提高厚大断面铸坯自补缩能力的方法
PCT/CN2011/076640 WO2012083671A1 (fr) 2010-12-23 2011-06-30 Procédé d'amélioration de la capacité d'auto-alimentation d'ébauche de coulée à profil épais

Publications (2)

Publication Number Publication Date
EP2656946A1 true EP2656946A1 (fr) 2013-10-30
EP2656946A4 EP2656946A4 (fr) 2017-10-25

Family

ID=44462698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11851813.3A Withdrawn EP2656946A4 (fr) 2010-12-23 2011-06-30 Procédé d'amélioration de la capacité d'auto-alimentation d'ébauche de coulée à profil épais

Country Status (6)

Country Link
US (1) US20130248056A1 (fr)
EP (1) EP2656946A4 (fr)
JP (1) JP5852126B2 (fr)
KR (1) KR101588677B1 (fr)
CN (1) CN102161090B (fr)
WO (1) WO2012083671A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102806330B (zh) * 2012-08-08 2015-02-04 中国科学院金属研究所 一种提高厚大断面连铸坯内部质量的方法
CN103008577B (zh) * 2012-12-07 2014-06-11 中国科学院金属研究所 微缺陷高利用率优质模铸钢锭的制备方法和模具
CN103128268B (zh) * 2013-01-17 2015-10-14 中国科学院金属研究所 用于大型特厚板坯的中低温打箱的方法
CN103008626B (zh) * 2013-01-17 2015-08-12 中国科学院金属研究所 用于大型特厚板坯的高温带液芯打箱的方法
CN112974730B (zh) * 2021-02-05 2022-02-11 燕山大学 用于大断面铸件的铸造装置及其铸造方法

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2705353A (en) * 1952-04-04 1955-04-05 Kaiser Aluminium Chem Corp Method of continuous casting
JPS5345610A (en) * 1976-10-06 1978-04-24 Sumitomo Metal Ind Ltd Soaking method for steel ingot
JPS5614064A (en) * 1979-07-16 1981-02-10 Sumitomo Metal Ind Ltd Continuous casting method
JPS6114067A (ja) * 1984-06-28 1986-01-22 Nippon Steel Corp 極厚スラブ用鋳型形状の決定方法
JPS62296940A (ja) * 1986-06-16 1987-12-24 Nippon Steel Corp 極厚スラブの鋳造方法
FR2631263B1 (fr) * 1988-05-13 1990-07-20 Siderurgie Fse Inst Rech Procede de refroidissement d'un produit metallique coule en continu
JPH04253501A (ja) * 1991-01-31 1992-09-09 Nkk Corp 連続鋳造鋳片の直接圧延方法
JP3161917B2 (ja) * 1994-09-30 2001-04-25 株式会社日立製作所 薄スラブ連続鋳造機及び薄スラブ連続鋳造方法
JP3146904B2 (ja) * 1995-02-07 2001-03-19 株式会社神戸製鋼所 大断面鋳片の垂直型連続鋳造方法
JP2001137901A (ja) * 1999-11-09 2001-05-22 Nkk Corp 連続鋳造鋳片のホットチャージ圧延方法
DE10133093A1 (de) * 2000-08-10 2002-02-21 Sms Demag Ag Verfahren und Strangführung zum Stützen, Führen und Kühlen von Gießsträngen aus Stahl, insbesondere von Vorprofilen für Träger
JP4613448B2 (ja) * 2001-06-01 2011-01-19 大同特殊鋼株式会社 垂直型鋳造方法および装置
CN1640569A (zh) * 2004-01-12 2005-07-20 鞍钢集团新钢铁有限责任公司 中厚板坯连铸连轧机组的直轧工艺
CA2625847C (fr) * 2005-10-28 2012-01-24 Novelis Inc. Homogeneisation et traitement thermique de metaux coules
JP4966547B2 (ja) * 2006-01-06 2012-07-04 住友金属工業株式会社 連続鋳造方法
JP4899629B2 (ja) * 2006-05-17 2012-03-21 住友金属工業株式会社 ビレットの連続鋳造方法
JP2010531734A (ja) * 2007-07-04 2010-09-30 宝山鋼鉄股▲分▼有限公司 効率的且省エネルギーな帯鋼連続鋳造及び連続圧延プロセス
JP5040521B2 (ja) * 2007-08-17 2012-10-03 株式会社Ｓｕｍｃｏ シリコン鋳造装置
CN101758208B (zh) * 2009-12-17 2012-12-12 上海宏钢电站设备铸锻有限公司 厚断面球墨铸铁件快速冷却的方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012083671A1 *

Also Published As

Publication number Publication date
JP5852126B2 (ja) 2016-02-03
CN102161090A (zh) 2011-08-24
US20130248056A1 (en) 2013-09-26
KR101588677B1 (ko) 2016-01-27
KR20130094330A (ko) 2013-08-23
WO2012083671A1 (fr) 2012-06-28
JP2014500801A (ja) 2014-01-16
CN102161090B (zh) 2012-11-07
EP2656946A4 (fr) 2017-10-25

Similar Documents

Publication Publication Date Title
US9393613B2 (en) Method for manufacturing hollow ingot for retaining ring of large generator by electroslag remelting
CN104399923B (zh) 一种生产特厚板连铸坯的方法
CN103212674B (zh) 一种钢板铸锭装置及用该装置生产特厚钢板铸锭的方法
EP2656946A1 (fr) Procédé d'amélioration de la capacité d'auto-alimentation d'ébauche de coulée à profil épais
CN113547102B (zh) 导电结晶器电渣重熔法制备大型钢锭的装置及方法
CN102189103A (zh) 一种轻合金电磁超声铸轧一体化装置和方法
CN104259441A (zh) 内置冷芯和顶置电磁场铸造大型钢锭的方法
CN102274955A (zh) 阳极板氮气保护隔氧全程快速冷却浇铸工艺及系统
CN101633105B (zh) 铜铝复合汇流排生产工艺和设备
CN1994623B (zh) 一种7xxx系铝合金半连续铸造装置及方法
CN102941338B (zh) 一种组芯铸造冷却速度的控制方法及装置
CN112743053A (zh) 一种用于解决包晶钢连铸板坯表面裂纹的结晶器及控制方法
CN101654743B (zh) 电渣炉定向凝固超大截面钢锭的装置与方法
CN102806330B (zh) 一种提高厚大断面连铸坯内部质量的方法
CN201179598Y (zh) 制造铜铝复合汇流排的生产工艺设备
CN112743052A (zh) 一种用于解决铸坯窄面裂纹的板坯结晶器和控制方法
CN203044873U (zh) 一种控制组芯铸造冷却速度的水冷装置
CN103128268B (zh) 用于大型特厚板坯的中低温打箱的方法
CN102161079B (zh) 一种高质量宽厚板坯制造工艺
CN104630675A (zh) 一种锡青铜盘管的制备方法
CN104858379B (zh) 一种梯温铸型铸造方法
JP2992364B2 (ja) 環状鋼製品の連続鋳造方法および連続鋳造装置
CN110773713B (zh) 一种离心铸造制备复合金属板的方法
CN105522132A (zh) 三角形连铸坯的制备装置及其使用方法
CN106995904B (zh) 一种防锈耐蚀铁镍合金带材的制备方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130610

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
RIC1 Information provided on ipc code assigned before grant

Ipc: B22D 27/04 20060101AFI20170913BHEP

Ipc: B22D 27/00 20060101ALI20170913BHEP

Ipc: B22D 11/124 20060101ALI20170913BHEP

RA4 Supplementary search report drawn up and despatched (corrected)

Effective date: 20170922

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20190103