US3702151A - Method for deoxidizing effervescent steel - Google Patents

Method for deoxidizing effervescent steel Download PDF

Info

Publication number
US3702151A
US3702151A US47313A US3702151DA US3702151A US 3702151 A US3702151 A US 3702151A US 47313 A US47313 A US 47313A US 3702151D A US3702151D A US 3702151DA US 3702151 A US3702151 A US 3702151A
Authority
US
United States
Prior art keywords
powder
casting
deoxidizing
air
stream
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
US47313A
Other languages
English (en)
Inventor
Jan F De Blok
Leonard Jansse
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.)
Koninklijke Nederlandsche Hoogovens en Staalfabrieken NV
Original Assignee
Koninklijke Hoogovens En Staal
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 Koninklijke Hoogovens En Staal filed Critical Koninklijke Hoogovens En Staal
Application granted granted Critical
Publication of US3702151A publication Critical patent/US3702151A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • C21C7/0068—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by introducing material into a current of streaming metal
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing

Definitions

  • This invention relates to a method for deoxidizing effervescent steel in which a deoxidation agent in the condition of a powder is injected into the steel stream during filling of molds from a casting ladle.
  • the present invention consists in that in a method as given in the preamble the grain size of the powder is essentially limited to between 40 microns and 200 microns, in which for at least 50% of the powder the grains have a largest linear dimension between 75 microns and 150 microns and in which the powder is uniformly metered when being supplied to the stream of casting metal during at least of the time for filling the casting mold.
  • the grains have a linear dimension between microns and 150 microns and if the metering of the powder to the casting stream takes place during at least of the casting time.
  • the speed of the air in the powder and air stream could influence the result of the deoxidation.
  • This speed relates to the greater or smaller divergence of the powder stream.
  • the air speed in the stream of powder and air is adjusted to 40 to 60 meters per second and in particular preferably at about 50 meters per second.
  • the mixture of powder and gas will be preheated more or less by the surroundings shortly before the blowing thereof into the metal. It has appeared that the danger is not always entertaining that for instance aluminum powder will be heated to such a high temperature that it becomes sticky. In that case the metering of the powder and thus also the uniformity of the quality of the final steel product will be influenced in an unfavourable manner.
  • FIG. 1 shows a device diagrammatically in longitudinal section.
  • FIG. 2 shows more or less diagrammatically this device in perspective view with part of a ladle, ingot mold and casting stream.
  • reference numeral 1 indicates a supply tube for a mixture of aluminum powder and air.
  • This supply tube is connected to a chamber 2, in which a supply funnel 3 and a duct 4 for air under pressure open.
  • Duct 4 is narrower at its discharge end to give a passage of A2".
  • the mutual positioning of the duct 4 and the funnel 3 in the chamber 2 is such that its causes the desired quantity of aluminum powder from the funnel 3 to be sucked in and entrained by the air under pressure leaving duct 4.
  • a control valve 6 is arranged in this duct 4 .
  • this control valve 6 By adjusting this control valve 6 and by adjusting the position of the duct 4, which means by having it extend into the chamher 2 over the desired distance it is possible to adjust the quantity of aluminum powder to be loaded into the air within wide limits.
  • the duct 4 could be slidable longitudinally throughv its hole in the Wall of chamber 2 in a suitable sliding seal in this hole.
  • the supply tube 1 Close to its discharge end the supply tube 1 is surrounded by a cooling jacket 7. This is connected through a hose or flexible branch duct 8 to the supply duct for air under pressure upstream of the control valve 6. At its free end the supply tube 1 is provided with a flange 9, so that cooling jacket 7 at this end has a radially directed outflow opening. The cooling air flowing out is thereby discharged in a direction which is transverse to the direction of the powder stream.
  • Ducts 4 and 8 are connected to a source of air at a pressure of to 6 atmospheres. It has appeared that suflicient cooling is obtained if per minute about 2 Nm. of air is passed through the cooling jacket 7.
  • FIG. 2 it has been shown diagrammatically in what way the device of FIG. 1 is used.
  • a casting ladle 11 filled with liquid steel is suspended over a casting mold 10 such as a known ingot mold and said ladle 11 has an outflow opening for the metal in its bottom, which can be closed by a stopper rod valve or the like.
  • a platform 12 for the operating personnel to allow them to check the casting process visually.
  • the casting streams from the ladle 11 is indicated by 13.
  • An operator manipulates the device according to FIG. 1, which is suspended pivotally to a suitable structure 14, which forms part of the casting ladle 11. Thus it is possible to bring the supply tube 1 at the desired location opposite the casting stream 13.
  • the device is connected to a source of air under. pressure by a hose 15 connected to duct 4.
  • the operator After opening the outflow opening in the bottom of the ladle and after the casting jet 13 has obtained a more or less stationary shape and condition the operator opens the control valve 6, so that blowing of the aluminum powder into the casting stream begins.
  • the metering of the quantity of powder in funnel 3 and the adjustment of control valve 6 will be predetermined so that the supply of aluminum powder continues during the period in which the casting stream flows on without varying its shape more than negligibly.
  • the operator also has the possibility to vary the supply of aluminum or to stop it entirely by operating the control valve 6 if the need thereto is felt during casting.
  • an ingot mold was filled by 20 tons by weight of steel intended for the manufacture of cold rolled sheet material suited for pressing for instance hub covers or bumpers of motor cars.
  • 900 grams of aluminum had to be added.
  • This aluminium was chosen as aluminum powder with grain sizes in essence between 40 microns and 200 microns. In a sieve test it was found that this powder was composed of fractions of the following dimensions:
  • the casting time of the block to be cast was adjusted to be 1 minute and 15 seconds, the metering of the powder was adjusted to be 900 grams per minute.
  • the powder was blown with a quantity of air under pressure of 450 liters per minute.
  • the load factor of the mixture thus was 2 grams of aluminum per liter of
  • the outflow speed of the aluminum powder from the discharge tube 1 was measured to be 46.7 in. per second.
  • the discharge tube was cooled by 2.3 Nm. of air under pressure per minute.
  • An improved method for the deoxidizing of effervescent steel being one which comprises (a) injecting an oxidizing agent into the casting stream during the filling of a casting mold from a ladle, wherein the improvement comprises (b) effecting delivery of the deoxidizing agent to the casting stream in the form of a powder having its grain size essentially limited to between 40 and 200 microns and at least 50% of which has a largest linear dimension between 75 and 150 microns, and
  • said delivery is eifected at a rate of from 700 to 1200 grams of aluminum powder per minute
  • the ratio of aluminum powder to air in the jet is in the range of about 1.9 to 2.2 grams of aluminum per liter of air.
  • the speed of said jet of air lies in the range of 40 to 60 meters per second.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Multimedia (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Continuous Casting (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
US47313A 1969-06-23 1970-06-18 Method for deoxidizing effervescent steel Expired - Lifetime US3702151A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL696909598A NL152933B (nl) 1969-06-23 1969-06-23 Werkwijze voor het desoxyderen van onrustig staal.

Publications (1)

Publication Number Publication Date
US3702151A true US3702151A (en) 1972-11-07

Family

ID=19807272

Family Applications (1)

Application Number Title Priority Date Filing Date
US47313A Expired - Lifetime US3702151A (en) 1969-06-23 1970-06-18 Method for deoxidizing effervescent steel

Country Status (6)

Country Link
US (1) US3702151A (enrdf_load_stackoverflow)
JP (1) JPS5421293B1 (enrdf_load_stackoverflow)
BE (1) BE752378A (enrdf_load_stackoverflow)
FR (1) FR2049203B1 (enrdf_load_stackoverflow)
GB (1) GB1313662A (enrdf_load_stackoverflow)
NL (1) NL152933B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955966A (en) * 1974-03-06 1976-05-11 August Thyssen-Hutte Ag Method for dispensing a fluidizable solid from a pressure vessel
US4303118A (en) * 1979-07-25 1981-12-01 Georgetown Steel Corporation Apparatus for producing aluminum-deoxidized continuously cast steel
US4352605A (en) * 1978-06-28 1982-10-05 Bcira Means for adding materials to a flowing stream
US4391319A (en) * 1979-08-27 1983-07-05 Keystone Consolidated Industries, Inc. Apparatus for introducing elements into molten metal streams and casting in inert atmosphere
USRE31676E (en) * 1982-09-29 1984-09-18 Thyssen Aktiengesellschaft vorm August Thyssen-Hutte AG Method and apparatus for dispensing a fluidizable solid from a pressure vessel
US5129629A (en) * 1990-10-11 1992-07-14 Hickman, Williams & Company Apparatus for feeding material into a molten stream
US6350295B1 (en) 2001-06-22 2002-02-26 Clayton A. Bulan, Jr. Method for densifying aluminum and iron briquettes and adding to steel
CN104220190A (zh) * 2012-03-28 2014-12-17 安赛乐米塔尔研发有限公司 金属的连续铸造方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2152439C1 (ru) * 1997-12-30 2000-07-10 Акционерное общество "Кузнецкий металлургический комбинат" Способ раскисления и микролегирования рельсовой стали алюминием
UA53928C2 (en) * 2002-03-18 2005-05-16 Oleksandr Ivanovych Sierov A method for making aluminium deoxidizer
RU2275431C2 (ru) * 2004-07-12 2006-04-27 Государственное Учреждение Институт металлургии Уральского отделения Российской Академии Наук (ГУ ИМЕТ УрО РАН) Способ раскисления стали алюминием

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955966A (en) * 1974-03-06 1976-05-11 August Thyssen-Hutte Ag Method for dispensing a fluidizable solid from a pressure vessel
US4352605A (en) * 1978-06-28 1982-10-05 Bcira Means for adding materials to a flowing stream
US4303118A (en) * 1979-07-25 1981-12-01 Georgetown Steel Corporation Apparatus for producing aluminum-deoxidized continuously cast steel
US4391319A (en) * 1979-08-27 1983-07-05 Keystone Consolidated Industries, Inc. Apparatus for introducing elements into molten metal streams and casting in inert atmosphere
USRE31676E (en) * 1982-09-29 1984-09-18 Thyssen Aktiengesellschaft vorm August Thyssen-Hutte AG Method and apparatus for dispensing a fluidizable solid from a pressure vessel
US5129629A (en) * 1990-10-11 1992-07-14 Hickman, Williams & Company Apparatus for feeding material into a molten stream
US6350295B1 (en) 2001-06-22 2002-02-26 Clayton A. Bulan, Jr. Method for densifying aluminum and iron briquettes and adding to steel
CN104220190A (zh) * 2012-03-28 2014-12-17 安赛乐米塔尔研发有限公司 金属的连续铸造方法
US20150158078A1 (en) * 2012-03-28 2015-06-11 Arcelormittal Investigación Desarrollo, S.L. Continuous casting process of metal
CN104220190B (zh) * 2012-03-28 2018-08-28 安赛乐米塔尔研发有限公司 金属的连续铸造方法
US12157165B2 (en) * 2012-03-28 2024-12-03 Arcelormittal Continuous casting process of metal

Also Published As

Publication number Publication date
NL152933B (nl) 1977-04-15
FR2049203B1 (enrdf_load_stackoverflow) 1974-09-20
DE2030221B2 (de) 1975-11-27
BE752378A (nl) 1970-12-23
DE2030221A1 (de) 1970-12-23
FR2049203A1 (enrdf_load_stackoverflow) 1971-03-26
NL6909598A (enrdf_load_stackoverflow) 1970-12-28
JPS5421293B1 (enrdf_load_stackoverflow) 1979-07-30
GB1313662A (en) 1973-04-18

Similar Documents

Publication Publication Date Title
US3702151A (en) Method for deoxidizing effervescent steel
US3253307A (en) Method and apparatus for regulating molten metal teeming rates
US3669181A (en) Pouring apparatus with submerged deflector plates for continuous casting
US2803533A (en) Method of injecting fluidized powders for metallurgical treatment
US4512800A (en) Wire injection apparatus
US3514285A (en) Method for feeding additive materials into a stream of molten metals
DE2043882A1 (en) Flat cast object formed with a spray of - atomised metal
US4391319A (en) Apparatus for introducing elements into molten metal streams and casting in inert atmosphere
US3224051A (en) Method of introducing addition agent into a melt
US3411566A (en) Device for supplying powdered material into a mold of a continuous casting machine
DE2816867A1 (de) Verfahren und vorrichtung zum einfuehren von pulvern in eine stranggiess- form
RU2122919C1 (ru) Способ охлаждения расплавленной стали при литье полосы и устройство для его осуществления
DE2408363A1 (de) Verfahren und einrichtung zum einbringen eines zuschlagstoffes in eine fluessige metallschmelze
JP4562347B2 (ja) 液体鋼の連続鋳造方法と装置
US3756805A (en) Method of producing lead bead bearing steel
US4327798A (en) Method of applying flux
US4200138A (en) Process for the shielding of a casting stream in a casting apparatus
US3467284A (en) Distributor for continuous casting machine
US3141767A (en) Steel casting process and apparatus
US4786466A (en) Low-sulfur, lead-free free machining steel alloy
DE69120829T2 (de) Verfahren und vorrichtung zur spätzugabe teilchenförmiger legierungen beim giessen von metallschmelzen
US1193670A (en) James cabby bavis
US3189956A (en) Production of effervescing steel
US3760862A (en) Method for casting steel ingots
US3633650A (en) Method of making and treating a continuously cast metal body