US3708314A - Agent for adding to a mould in which molten ferritic stainless steel is cast by a continuous casting process - Google Patents

Agent for adding to a mould in which molten ferritic stainless steel is cast by a continuous casting process Download PDF

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Publication number
US3708314A
US3708314A US00169366A US3708314DA US3708314A US 3708314 A US3708314 A US 3708314A US 00169366 A US00169366 A US 00169366A US 3708314D A US3708314D A US 3708314DA US 3708314 A US3708314 A US 3708314A
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US
United States
Prior art keywords
percent
agent
mould
weight
molten
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.)
Expired - Lifetime
Application number
US00169366A
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English (en)
Inventor
T Kishida
T Arikawa
S Matsuyama
S Fukushige
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.)
Aikoh Co Ltd
Nippon Steel Corp
Original Assignee
Aikoh Co Ltd
Sumitomo Metal Industries Ltd
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 Aikoh Co Ltd, Sumitomo Metal Industries Ltd filed Critical Aikoh Co Ltd
Application granted granted Critical
Publication of US3708314A publication Critical patent/US3708314A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • B22D11/07—Lubricating the moulds
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S588/00—Hazardous or toxic waste destruction or containment
    • Y10S588/90—Apparatus

Definitions

  • a mould in w hic hmolt en ferritic stainless steel is cast by a cgn ti nugys cast i ngprocess which lubricates the mould wall with a melting velocity coinciding with the casting velocity and a uniform fluidity without unevenly melting the adding powder as described above and at the same time can prevent oxidization and keep warmth before melting on the upper surface of the molten steel and has it as an object to obtain ferritic stainless steel ingots having no surface flaw.
  • [hgieature of the present invention is an agent for addingJcLa mould in which molten rmnc stiii? steeLjsgast by ,a continuous casting process characterizcdhmntainipg 20 to 35 percent by weight of fly ash, 30 to 40 percent by weight of Portland ggmggt @t dLQLbLsstfurnfi g sl g. 2.01. .21 per sntbxxslsmgfi QUQI PQL 2 .t e iaercem by. wish! o e s. 9!
  • the agent of the present invention has no bad influence on molten steels, does not impair the nozzle and keeps a viscosity adapted to a lubricating action from just before the beginning of the solidification of the molten steel to just after the solidification.
  • the mixed raw materials giving these properties have the above mentioned kinds and percentages of components, particle size, melting point and viscosity. They are homogeneously mixed together and are gradually added to the upper surface of a molten steel poured to a fixed height through a tundish nozzle immersed in the mould.
  • the agent according to the present invention is added to the molten steel bath surface by either manpower or mechanical operation so as to uniformly cover the bath surface.
  • the agent forms a melt layer 5 from below due to the heat of the molten steel 3, flows onto the mould wall so as to form a lubricating film 8, is deposited on the surface of the cast ingot and is led together with the cast ingot out of the mould.
  • the unmolten powder layer 6 gradually melts to supplement the lubricating film.
  • the agent is additionally put in. 7 shows a solidified layer ofthe molten steel.
  • the agent of the present invention contains respective components in such percentages as is specified in the above mentioned subject matter of the present invention, the expected effect of the present invention is attained by the combined effects of the respective components.
  • the reasons for limiting the component, percentage, granularity, melting point and viscosity of the composition shall be detailed in the following.
  • the melting point of the agent of the present invention should be l,000 to l',l00C.
  • the velocity of the agent to melt in contact with the molten steel is so high that the amount of production of the melt required for the casting velocity of the molten steel is exceeded, the melt on the molten steel bath surface becomes excessive, carbon among the components is consumed so early that the agent must be more additionally put in to keep the reducing atmosphere and thus the agent is used in vain.
  • the melting point exceeds l,l00C, the melting velocity is so low that no sufficient lubricating film can be provided.
  • the viscosity at l,500C is less than 0.1 poise, the fluidity of the melt is so high that it is impossible to form a favorable lubricating film. In case it exceeds 5.0 poise, the lubricating film does not well develop between the solidified shell of the molten steel and the surface of the mould. This also causes flaws on the surface of the cast ingot and is improper. Therefore, in order to make the melting velocity high and uniform, the particle size of the mixed raw material is made less than 100 meshes. When they exceed I00 meshes, the melting velocity becomes partly high or low.
  • the fly ash among the mixed raw materials consists predominantly of aluminum silicate, has once passed through a molten state in the producing process and is high in the fusibility.
  • any of such fluorides and silicofluorides as sodium fluoride and sodiumsilicofluoride and the like is added to reduce the viscosity of the melt. It mixing rate is optimum at 5 to l0 percent. Ifit exceeds 10 percent, the powderness becomes so low that the production of the lubricating film becomes unfavorable. If it is less than 5 percent, there is no effect of reducing the viscosity.
  • Qqke graphite or charcoal is added as a car; bon source so that the agentmay have a reducing ntmosphere and has effec ts of preventing t he increase ofl molt en s te el when the agent is added and of preventing the heat absorption from the molten steel by the agent itself by burning and generating heat.
  • lts mixing rate is proper at 5 to ID percent. If it exceeds 10 percent, carbon is likely to be added to the molten steel or particularly of a low carbon stainless steel. If it is less than 5 percent, the reducing force is so weak that the increase of FeO can not be prevented.
  • the proper amount of use of the agent is 0.5 to 1.0 kg/ton of the molten steel in a slab and 1.0 to 2.0 kg/ton of the molten steel in a billet or bloom. If such amount of use as matches the amount led out as deposited on the cast ingot is added, the object is attained.
  • the apparatus was a slab casting machine using a immersion nozzle.
  • Six cast ingots of dimensions of I56 mm thick X 1,040 mm wide X 8,000 mm long were taken (the bad parts at the forward end and tail part were cut off) per charge.
  • Each cast ingot was made one section of length 1 meter.
  • the surface flaw index on the entire surface of the cast ingot jivas'd'eterrhinedby in- Sui-law: flaw index Nutnlmr of sections lmving'fluws:
  • An agent for improving the surfaces of products in the continuous casting in a mold of molten ferritic stainless steel by way of lubricating the mold well with a melting velocity coincident with the casting velocity and a uniform fluidity without any uneven melting of the agent comprising parts by weight of:
  • a carbonaceous substance from the group consisting of coke and graphite and charcoal, i and having a melting point 6r l,000 to l,l00C and a viscosity of 0.1 to 5.0 poise at'l,500C and an average particle ,size less than mesh.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US00169366A 1970-08-12 1971-08-05 Agent for adding to a mould in which molten ferritic stainless steel is cast by a continuous casting process Expired - Lifetime US3708314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45070043A JPS4835133B1 (enrdf_load_stackoverflow) 1970-08-12 1970-08-12

Publications (1)

Publication Number Publication Date
US3708314A true US3708314A (en) 1973-01-02

Family

ID=13420142

Family Applications (1)

Application Number Title Priority Date Filing Date
US00169366A Expired - Lifetime US3708314A (en) 1970-08-12 1971-08-05 Agent for adding to a mould in which molten ferritic stainless steel is cast by a continuous casting process

Country Status (10)

Country Link
US (1) US3708314A (enrdf_load_stackoverflow)
JP (1) JPS4835133B1 (enrdf_load_stackoverflow)
AU (1) AU467314B2 (enrdf_load_stackoverflow)
BE (1) BE771209A (enrdf_load_stackoverflow)
BR (1) BR7105207D0 (enrdf_load_stackoverflow)
CA (1) CA959605A (enrdf_load_stackoverflow)
FR (1) FR2102212B1 (enrdf_load_stackoverflow)
GB (1) GB1357382A (enrdf_load_stackoverflow)
SE (1) SE367935B (enrdf_load_stackoverflow)
SU (1) SU515430A3 (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937269A (en) * 1974-04-08 1976-02-10 Crucible Inc Mold powder composition and method for continuously casting employing the same
US3964916A (en) * 1974-12-13 1976-06-22 Corning Glass Works Casting powder
US4102690A (en) * 1975-04-16 1978-07-25 Janusz Koper Powder for continuous casting
US4303120A (en) * 1978-02-01 1981-12-01 The Clay Harden Company Continuous casting mold flux powders
US4312400A (en) * 1978-02-01 1982-01-26 The Clay Harden Company Continuous casting method and mold flux powders
US4438803A (en) * 1980-04-04 1984-03-27 Nippon Steel Corporation Continuous casting of steel slabs and blooms free from surface defects
US6491751B1 (en) 1998-09-18 2002-12-10 Texas Industries, Inc. Method for manufacturing cement using a raw material mix including finely ground steel slag
US20060272551A1 (en) * 2003-01-31 2006-12-07 Comrie Douglas C Cementitious materials including slag and geopolymers
WO2011006649A1 (en) * 2009-07-14 2011-01-20 Corus Staal Bv Casting mould powder
CN102816037A (zh) * 2012-07-31 2012-12-12 马鞍山科润冶金材料有限公司 一种高温合金钢用复合发热剂
CN102825246A (zh) * 2012-07-31 2012-12-19 马鞍山科润冶金材料有限公司 一种利用粉煤灰制炼钢模铸的保护渣
CN102826944A (zh) * 2012-07-31 2012-12-19 马鞍山科润冶金材料有限公司 一种合金工具钢用复合发热剂
CN109175279A (zh) * 2018-11-26 2019-01-11 攀钢集团攀枝花钢铁研究院有限公司 Yq450nqr1乙字钢大方坯连铸生产方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH596909A5 (enrdf_load_stackoverflow) * 1975-05-16 1978-03-31 Mannesmann Ag
JPS5426026A (en) * 1977-07-29 1979-02-27 Kiyuuji Ueda Molding flask for concrete
JPH0673730B2 (ja) * 1990-11-30 1994-09-21 品川白煉瓦株式会社 連続鋳造用発熱型モールドパウダー
RU2424870C2 (ru) * 2009-09-07 2011-07-27 Открытое акционерное общество "Боровичский комбинат огнеупоров" Шлакообразующая смесь для непрерывной разливки стали

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3262165A (en) * 1962-12-17 1966-07-26 Sandvikens Jernverks Ab Heat-insulating compositions and their use
US3607234A (en) * 1968-06-08 1971-09-21 Nippon Kokan Kk Steel-refining composition containing portland cement and fluorspar

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1251667A (enrdf_load_stackoverflow) * 1968-10-22 1971-10-27

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3262165A (en) * 1962-12-17 1966-07-26 Sandvikens Jernverks Ab Heat-insulating compositions and their use
US3607234A (en) * 1968-06-08 1971-09-21 Nippon Kokan Kk Steel-refining composition containing portland cement and fluorspar

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937269A (en) * 1974-04-08 1976-02-10 Crucible Inc Mold powder composition and method for continuously casting employing the same
US3964916A (en) * 1974-12-13 1976-06-22 Corning Glass Works Casting powder
US4102690A (en) * 1975-04-16 1978-07-25 Janusz Koper Powder for continuous casting
US4303120A (en) * 1978-02-01 1981-12-01 The Clay Harden Company Continuous casting mold flux powders
US4312400A (en) * 1978-02-01 1982-01-26 The Clay Harden Company Continuous casting method and mold flux powders
US4438803A (en) * 1980-04-04 1984-03-27 Nippon Steel Corporation Continuous casting of steel slabs and blooms free from surface defects
US6491751B1 (en) 1998-09-18 2002-12-10 Texas Industries, Inc. Method for manufacturing cement using a raw material mix including finely ground steel slag
US20060272551A1 (en) * 2003-01-31 2006-12-07 Comrie Douglas C Cementitious materials including slag and geopolymers
US7294193B2 (en) * 2003-01-31 2007-11-13 Douglas C Comrie Cementitious materials including slag and geopolymers
WO2011006649A1 (en) * 2009-07-14 2011-01-20 Corus Staal Bv Casting mould powder
CN102816037A (zh) * 2012-07-31 2012-12-12 马鞍山科润冶金材料有限公司 一种高温合金钢用复合发热剂
CN102825246A (zh) * 2012-07-31 2012-12-19 马鞍山科润冶金材料有限公司 一种利用粉煤灰制炼钢模铸的保护渣
CN102826944A (zh) * 2012-07-31 2012-12-19 马鞍山科润冶金材料有限公司 一种合金工具钢用复合发热剂
CN102826944B (zh) * 2012-07-31 2016-08-03 马鞍山科润冶金材料有限公司 一种合金工具钢用复合发热剂
CN102816037B (zh) * 2012-07-31 2016-08-03 马鞍山科润冶金材料有限公司 一种高温合金钢用复合发热剂
CN109175279A (zh) * 2018-11-26 2019-01-11 攀钢集团攀枝花钢铁研究院有限公司 Yq450nqr1乙字钢大方坯连铸生产方法
CN109175279B (zh) * 2018-11-26 2021-02-09 攀钢集团攀枝花钢铁研究院有限公司 Yq450nqr1乙字钢大方坯连铸生产方法

Also Published As

Publication number Publication date
FR2102212A1 (enrdf_load_stackoverflow) 1972-04-07
DE2139765A1 (de) 1972-02-17
CA959605A (en) 1974-12-24
BR7105207D0 (pt) 1973-04-24
SU515430A3 (ru) 1976-05-25
BE771209A (fr) 1971-12-16
FR2102212B1 (enrdf_load_stackoverflow) 1974-04-26
AU467314B2 (en) 1975-11-27
JPS4835133B1 (enrdf_load_stackoverflow) 1973-10-26
SE367935B (enrdf_load_stackoverflow) 1974-06-17
GB1357382A (en) 1974-06-19
AU3210971A (en) 1973-02-08
DE2139765B2 (de) 1976-02-05

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