WO2011071141A1 - Agent permettant de maintenir la température de surface de l'acier liquide et procédé permettant de maintenir la température de surface de l'acier liquide - Google Patents

Agent permettant de maintenir la température de surface de l'acier liquide et procédé permettant de maintenir la température de surface de l'acier liquide Download PDF

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Publication number
WO2011071141A1
WO2011071141A1 PCT/JP2010/072211 JP2010072211W WO2011071141A1 WO 2011071141 A1 WO2011071141 A1 WO 2011071141A1 JP 2010072211 W JP2010072211 W JP 2010072211W WO 2011071141 A1 WO2011071141 A1 WO 2011071141A1
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WO
WIPO (PCT)
Prior art keywords
molten steel
mass
steel surface
heat insulating
melting point
Prior art date
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PCT/JP2010/072211
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English (en)
Japanese (ja)
Inventor
利明 溝口
大輔 三木
徳彦 内山
Original Assignee
新日本製鐵株式会社
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 新日本製鐵株式会社 filed Critical 新日本製鐵株式会社
Priority to BR112012013501-5A priority Critical patent/BR112012013501B1/pt
Priority to JP2011514929A priority patent/JP4855552B2/ja
Priority to CN201080055433.7A priority patent/CN102762320B/zh
Publication of WO2011071141A1 publication Critical patent/WO2011071141A1/fr

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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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/10—Hot tops therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions

Definitions

  • the present invention relates to a molten steel surface heat insulating agent that coats a molten steel surface for the purpose of heat insulation / heat retention or air oxidation prevention when the molten steel is transferred or refined by a ladle or a tundish for continuous casting.
  • the surface of the molten steel is covered with a molten steel surface heat insulating agent to prevent heat dissipation from the molten steel and intrusion of outside air.
  • a molten steel surface heat insulating agent As a molten steel surface heat insulating agent, shochu containing SiO 2 and C as main components is widely used. When shochu is used as a molten steel surface heat insulating agent, SiO 2 reacts with Al in the molten steel to generate Al 2 O 3 -based inclusions, which increases the surface defects of the product.
  • Patent Document 1 an MgO-based molten steel surface heat insulating agent has been developed as a heat insulating agent with a small amount of SiO 2 .
  • the molten steel surface heat insulating agent mainly composed of MgO has a high melting point and is mainly a solid phase at the operating temperature, the molten steel surface cannot be uniformly coated, and the reaction between the outside air and the molten steel surface causes Al 2 O 3 inclusions are produced.
  • the present invention solves the above-mentioned problems, and does not produce alumina inclusions in the molten steel due to the components derived from the molten steel surface heat insulating agent, and has a high melting rate on the molten steel surface, making the molten steel surface uniform.
  • An object of the present invention is to provide a molten steel surface heat insulating agent that can be coated on the surface.
  • the present invention employs the following configurations and methods.
  • a first aspect of the present invention is a molten steel surface heat insulating agent disposed on a molten steel surface having a predetermined molten steel surface temperature, and a low melting point raw material having a melting point lower than the molten steel surface temperature of 50% by mass or more.
  • a high melting point raw material having a melting point higher than the surface temperature of the molten steel and less than 50% by mass, and having an average composition of 10 to 60% by mass of CaO, 10 to 70% by mass of Al 2 O 3 , 3 and ⁇ 30 wt% of MgO, 0 - 10 wt% and SiO 2 contained a total of 70 mass% or more, the CaO and the Al 2 O 3 and the ratio CaO / Al 2 O 3 0.5-2.
  • This is a molten steel surface heat insulating agent having a melting point lower than the molten steel surface temperature and 70% by mass or more being a powder having a particle size of 200 to 1000 ⁇ m.
  • a second aspect of the present invention is a molten steel surface in which the molten steel surface heat-retaining agent according to (1) is disposed on the molten steel surface so that the average molten layer thickness is in the range of 5 to 30 mm. It is a heat retention method.
  • alumina inclusions are not generated in the molten steel due to the components of the molten steel surface heat insulating agent, and the molten steel surface heat insulating agent quickly melts to make the molten steel surface uniform. It is possible to suppress the formation of alumina inclusions due to contact between the molten steel and the atmosphere.
  • the molten steel surface heat insulating agent can be melted quickly and the molten steel surface can be coated uniformly and surely, and the occurrence of shelves can be prevented. Generation of alumina inclusions due to contact can be suppressed.
  • the inventors examined a method for increasing the melting rate of the molten steel surface heat insulating agent in order to uniformly coat the molten steel surface with the molten steel surface heat insulating agent.
  • the melting point is lower than the molten steel surface temperature, which is produced by mixing a low melting point raw material having a melting point of 50% by mass or more lower than the molten steel surface temperature and a high melting point material having a melting point of less than 50% by mass higher than the molten steel surface temperature. It has been found that when a molten steel surface heat insulating agent is used, a melt is generated at the initial stage of melting of the molten steel surface heat insulating agent, and the molten steel surface heat insulating agent can be rapidly melted.
  • the melting point of the molten steel surface heat insulating material is a temperature at which melting starts when the temperature of the substance is raised, and in the case of a multi-component substance, it is a melting point with an average composition corresponding to the solidus temperature.
  • the surface temperature of the molten steel in a continuous casting tundish or ladle is 1550 ° C to 1650 ° C. Since the liquid phase molten steel surface heat insulating agent uniformly coats the molten steel surface, generation of Al 2 O 3 -based inclusions due to the molten steel surface coming into contact with the outside air can be prevented.
  • the low-melting-point raw material generates a melt at an initial stage, and the high-melting-point raw material is brought into contact with the melt, thereby promoting diffusion of the high-melting-point raw material into the melt and increasing the melting rate of the high-melting-point raw material.
  • the ratio of the low melting point raw material is prescribed
  • 90 mass%, 80 mass%, or 80 mass% may be sufficient.
  • 70 mass% or more of the molten steel surface heat insulating material is made into a powder having a particle size of 200 to 1000 ⁇ m, whereby the low melting point raw material is rapidly melted and the high melting point raw material is It can be quickly diffused into the melt. More preferably, 70 mass% or more of the molten steel surface heat insulating agent is a powder having a particle size of 300 to 900 ⁇ m, and more preferably 70 mass% or more of the molten steel surface heat insulating agent is a powder having a particle size of 500 to 800 ⁇ m.
  • the particle size here is a dimension of the opening of the sieve, and is a dimension that can pass through the sieve having the predetermined opening.
  • 70% by mass or more is larger than the particle size of 1000 ⁇ m, the low melting point raw material is not rapidly melted, and the diffusion rate of the high melting point raw material into the melt is further reduced, so that the surface of the molten steel is in contact with the outside air. As a result, Al 2 O 3 -based inclusions are generated.
  • 70 mass% or more of the molten steel surface heat insulating agent is a powder having a particle size of 200 ⁇ m or less, the cost of making the raw material fine becomes enormous.
  • the powder having a particle size of 200 to 1000 ⁇ m occupies less than 70% by mass of the molten steel surface heat insulating agent, the amount of solution produced is not sufficient, and the high melting point raw material is introduced into the melt. Because the diffusion rate of the steel decreases, the surface of the molten steel comes into contact with the outside air.
  • the molten steel surface heat insulating agent should just be put in the bag in the state with which the low melting-point raw material and the high melting-point raw material were mixed uniformly.
  • the molten steel surface heat insulating agent in the state of being put in the bag can be put into the molten steel surface together with the bag.
  • the particle diameters of the low melting point raw material and the high melting point raw material are greatly different, for example, when a raw material having a surface temperature of 200 to 1000 ⁇ m and a raw material of less than 200 ⁇ m or more than 1000 ⁇ m are mixed in the bag, The low melting point raw material and the high melting point raw material are unevenly distributed, and if the high melting point raw material first comes into contact with the molten steel surface, the molten steel surface is not rapidly generated, and the molten steel surface is exposed to the outside air. Contact.
  • melting point (melting point in average composition) of the molten steel surface heat insulating agent is higher than the molten steel surface temperature, the molten steel surface heat insulating agent does not reach a completely molten state, and the spreadability on the molten steel surface deteriorates, and the molten steel surface Will come into contact with outside air. For this reason, melting
  • the molten steel surface heat insulating agent When using a molten steel surface heat insulating agent that is completely melted, melting of refractories such as ladle and tundish becomes a problem. Therefore, in the molten steel surface heat insulating agent according to the present embodiment, melting of the tundish is prevented by using a raw material containing magnesia (MgO) used in a ladle or a tundish coating material. If the amount of magnesia contained is less than 3% by mass, the rate of erosion of the ladle or tundish coating material will be increased, which hinders operation. On the other hand, when the amount of magnesia contained is higher than 30% by mass, the melting point increases, so that the molten steel cannot be uniformly coated. Therefore, in the molten steel surface heat insulating agent according to the present embodiment, the magnesia content is regulated to 3 to 30% by mass. More preferably, it is 5 to 30% by mass, and still more preferably 7 to 25% by mass.
  • the molten steel surface heat insulating agent according to this embodiment has a composition after mixing (average composition) of 10 to 60% by mass, preferably 15 to 55% by mass, more preferably 25 to 50% by mass of CaO, 10 to 70% by mass.
  • the main components are preferably 20 to 65% by mass, more preferably 40 to 60% by mass of Al 2 O 3 , 3 to 30% by mass of MgO, and 0 to 10% by mass or less of SiO 2 .
  • the mass of SiO 2 occupying the molten steel surface heat insulating agent exceeds 10 mass%, the reaction with Al in the molten steel generates Al 2 O 3 -based inclusions, which increases the surface defects of the product. End up.
  • the content of MgO is as described above. “Containing as a main component” means that the corresponding component occupies 70% by mass or more of the whole. In the molten steel surface heat insulating agent according to the present embodiment, the total of the above components may be 80% by mass or 90% by mass or more of the whole.
  • Examples of the low melting point raw material include B 2 O 3 , Li 2 O, Na 2 O, CaO—Al 2 O 3 , CaO—SiO 2 , SrO—SiO 2 , Al 2 O 3 whose melting point is lower than the molten steel surface temperature.
  • Composite oxides such as —CaO—MgO, Al 2 O 3 —CaO—SiO 2 , Al 2 O 3 —CaO—ZrO 2 , Al 2 O 3 —MgO—SiO 2 , and CaF 2 can be used.
  • this composite oxide a solid obtained by solidifying an arbitrary multi-component melt such as one obtained by pre-melting quick lime and alumina, or alumina cement obtained by pre-melting quick lime and bauxite can be used.
  • the high melting point raw material include MgO produced by firing magnesite, electromelted MgO, CaO, Al 2 O 3 , SiO 2 , SrO, ZrO 2 , Al 2 O 3 —MgO, CaO—MgO can be used.
  • composition of the specific low melting-point raw material and high melting-point raw material which comprise a molten steel surface heat retention agent, the combination and mixture ratio of a low-melting-point raw material and a high melting-point raw material are shown as an Example later.
  • the above-described molten steel surface thermal insulation agent is arranged on the molten steel surface so that the average melt thickness is in the range of 5 to 30 mm. This is because when the average melt thickness is less than 5 mm, the molten steel surface is not sufficiently blocked from the outside air. In addition, when the average melt thickness exceeds 30 mm, the upper part of the molten steel surface heat insulating agent located at a position away from the molten steel as the heat source is cooled, so that the temperature of the ladle or tundish is lower than that of the molten steel.
  • the molten steel surface heat insulating agent solidifies and adheres to the surface of the object, and a gap is formed between the molten steel and the molten steel surface heat insulating agent.
  • This is called shelving.
  • shelving When shelving occurs, a gap is formed between the molten steel and the molten steel surface heat insulating agent, so that the molten steel surface comes into contact with the outside air.
  • the molten steel surface heat insulating agent may be arranged on the molten steel surface so that the average melt thickness is in the range of 7 to 25 mm, or 9 to 20 mm.
  • the present invention will be described based on examples, but the conditions in the examples are one example of conditions adopted to confirm the feasibility and effects of the present invention, and the present invention is an example of these conditions. It is not limited to only.
  • the present invention can adopt various conditions or combinations of conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
  • the molten steel with 1 charge of 280 t was subjected to hot metal preliminary treatment, converter decarburization, and vacuum degassing treatment with RH to produce ultra-low carbon steel.
  • a slab was produced by continuous casting using a tundish having a capacity of 60 t. Casting was performed continuously for 15 charges of molten steel.
  • the molten steel surface temperature was 1560 to 1580 ° C.
  • the molten steel surface heat-retaining agent of the present invention or the comparative example was used to keep the molten steel in the tundish from the beginning of casting.
  • 500 kg of the bag was added to the tundish in both the examples and comparative examples.
  • One slab has a thickness of 250 mm, a length of 7000 mm, and a width of 1500 mm.
  • the slab was made into a cold-rolled steel sheet having a thickness of 0.7 mm and a width of 1500 mm through a commonly used hot rolling and cold rolling process.
  • Tables 1 to 4 show data of examples and comparative examples. Although divided into four tables for the sake of layout, Table 2 is a continuation of Table 1, Table 3 is a continuation of Table 2, and Table 4 is a continuation of Table 3.
  • Al 2 O 3 —CaO—ZrO 2 in Table 1 is 50% by mass of Al 2 O 3 , 45% by mass of CaO and 5% by mass of ZrO 2 .
  • * 7 Al 2 O 3 —MgO—SiO 2 in Table 1 is 25% by mass of Al 2 O 3 , 25% by mass of MgO, and 50% by mass of SiO 2 .
  • * 8 Al 2 O 3 —MgO is 75% by mass of Al 2 O 3 and 25% by mass of MgO.
  • * 9 CaO—MgO is 70% by mass of CaO and 30% by mass of MgOs.
  • the thickness of the molten layer * 10 in Table 4 was obtained by immersing an iron bar in molten steel and setting the thickness of the molten steel surface heat insulating agent attached thereto as the molten layer thickness.
  • O is a change amount of the total oxygen amount in the tundish molten steel with respect to the total oxygen amount in the molten steel after RH treatment (after vacuum degassing treatment) in 1 to 2 pans of continuous continuous casting.
  • the number of defects is the average number of surface defects due to oxide inclusions present in each cold-rolled steel sheet coil obtained from steel slabs produced in 1-2 pans of continuous continuous casting. It is.
  • the total oxygen amount in the tundish molten steel is 1 to 2 pans of continuous continuous casting, compared to the total oxygen amount in the molten steel after RH treatment (after vacuum degassing treatment). is decreasing.
  • the molten steel surface heat insulating agent melts quickly and uniformly coats the tundish surface, so that the formation of alumina inclusions due to contact between the molten steel and the atmosphere is suppressed, and the alumina inclusions in the molten steel surface. This is because it was removed from the molten steel.
  • the present invention due to the component derived from the molten steel surface heat insulating agent, there is no generation of alumina inclusions in the molten steel, and the melting rate on the molten steel surface is high, and the molten steel surface is uniformly coated. It is possible to provide a molten steel surface heat insulating agent capable of

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

La présente invention a trait à un agent permettant de maintenir la température de surface de l'acier liquide, qui est appliqué sur la surface de l'acier liquide qui a une température de surface prédéterminée. L'agent permettant de maintenir la température de surface de l'acier liquide contient une quantité supérieure à 50 % en masse d'un matériau à point de fusion bas qui est doté d'un point de fusion inférieur à la température de surface de l'acier liquide et une quantité inférieure à 50 % en masse d'un matériau à matériau à point élevé qui est doté d'un point de fusion supérieur à la température de surface de l'acier liquide, tout en contenant 10 à 60 % en masse de CaO, 10 à 70 % en masse d'Al2O3, 3 à 30 % en masse de MgO et 0 à 10 % en masse de SiO2 de sorte que le total est supérieur à 70 % en masse et le rapport de CaO sur Al2O3, nommément CaO/Al2O3 est de 0,5 à 2,0. L'agent permettant de maintenir la température de surface de l'acier liquide est doté d'un point de fusion inférieur à la température de surface de l'acier liquide et est constitué d'une poudre qui contient des particules ayant un diamètre des particules de 200 à 1 000 μm à hauteur au moins de 70 % en masse.
PCT/JP2010/072211 2009-12-10 2010-12-10 Agent permettant de maintenir la température de surface de l'acier liquide et procédé permettant de maintenir la température de surface de l'acier liquide WO2011071141A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR112012013501-5A BR112012013501B1 (pt) 2009-12-10 2010-12-10 Agente para manutenção da temperatura da superfície do aço fundido e método para manutenção da temperatura da superfície do aço fundido
JP2011514929A JP4855552B2 (ja) 2009-12-10 2010-12-10 溶鋼表面保温方法
CN201080055433.7A CN102762320B (zh) 2009-12-10 2010-12-10 钢水表面保温剂和钢水表面保温方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009280205 2009-12-10
JP2009-280205 2009-12-10

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WO2011071141A1 true WO2011071141A1 (fr) 2011-06-16

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JP (1) JP4855552B2 (fr)
KR (1) KR20120080250A (fr)
CN (1) CN102762320B (fr)
BR (1) BR112012013501B1 (fr)
WO (1) WO2011071141A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105108089A (zh) * 2015-07-31 2015-12-02 铜陵市大明玛钢有限责任公司 一种钢水表面保温剂的配置方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105200186A (zh) * 2015-09-02 2015-12-30 铜陵翔宇商贸有限公司 一种钢水表面保温剂的配置方法
CN114262765A (zh) * 2021-12-23 2022-04-01 上海盛宝冶金科技有限公司 一种环保型中间包钢水保温剂及其制备方法

Citations (3)

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JPH01317667A (ja) * 1988-06-16 1989-12-22 Yoshizawa Sekkai Kogyo Kk 金属溶湯保温材とその製造方法
JPH06170507A (ja) * 1992-12-02 1994-06-21 Nippon Steel Corp 溶鋼表面保温剤
JP2006218540A (ja) * 2005-01-11 2006-08-24 Nippon Steel Corp 溶鋼保温剤

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Publication number Priority date Publication date Assignee Title
CN1063432A (zh) * 1991-01-26 1992-08-12 黄胜利 钢水保温剂
JPH10263768A (ja) * 1997-03-24 1998-10-06 Sumitomo Metal Ind Ltd 転炉スラグの再利用方法
CN1064085C (zh) * 1998-07-16 2001-04-04 江苏江南铁合金厂 钢水表面保温兼精炼剂及其制备方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01317667A (ja) * 1988-06-16 1989-12-22 Yoshizawa Sekkai Kogyo Kk 金属溶湯保温材とその製造方法
JPH06170507A (ja) * 1992-12-02 1994-06-21 Nippon Steel Corp 溶鋼表面保温剤
JP2006218540A (ja) * 2005-01-11 2006-08-24 Nippon Steel Corp 溶鋼保温剤

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105108089A (zh) * 2015-07-31 2015-12-02 铜陵市大明玛钢有限责任公司 一种钢水表面保温剂的配置方法

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Publication number Publication date
BR112012013501A2 (pt) 2016-05-31
JPWO2011071141A1 (ja) 2013-04-22
CN102762320B (zh) 2015-04-22
KR20120080250A (ko) 2012-07-16
CN102762320A (zh) 2012-10-31
BR112012013501B1 (pt) 2019-06-25
BR112012013501A8 (pt) 2017-10-17
JP4855552B2 (ja) 2012-01-18

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