US3561722A - Steel casting mold insert - Google Patents

Steel casting mold insert Download PDF

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Publication number
US3561722A
US3561722A US687547A US3561722DA US3561722A US 3561722 A US3561722 A US 3561722A US 687547 A US687547 A US 687547A US 3561722D A US3561722D A US 3561722DA US 3561722 A US3561722 A US 3561722A
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US
United States
Prior art keywords
mold
insert
ingot
plates
steel
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
US687547A
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English (en)
Inventor
Helmut Kobusch
Walter Pfaff
Arnold Pfeiffer
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
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Publication of US3561722A publication Critical patent/US3561722A/en
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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
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/10—Hot tops therefor

Definitions

  • ABSTRACT An insert for steel casting molds which consists of four individual heat-insulating plates. These plates are reinforced with steel sheets or rods on their sides facing the mold walls. When the molds are filled with liquid steel, the reinforcements fuse with the ingot upon cooling, and the insert leaves the mold together therewith.
  • the insert remains on the ingot throughout reheating in a furnace prior to rolling and is discarded only in the roller mill as scrap.
  • the device and the process of using the same reduce segregation and cavitation in the ingot, also considerably reduce scrap formation and lengthen the working life of the molds.
  • PATENTED FEB 91971 Inventors. HELHIIT KOBuScH WHLTER PFMEF mum. PFHFFER STEEL CASTING MOLD INSERT
  • the invention relates to an insertfor ingot molds and similar casting molds which consists of thin, heat-insulating plates which are detachably hung into the upper part of the mold.
  • the device is particularly applicable for pouring and casting of killed steels.
  • a cavity or piping forms in the top end of the ingot when killed steels solidify. These cavities extend into the interior of the pig or ingot to a greater or lesser extent and fuse only partially during rolling. Therefore, a certain amount of scrap collects in the rolling mill which depends on the size of the piping.
  • the upper part of the mold is lined with heat-insulating plates which are suspended in the mold and rigidly connected thereto, as described, e.g., in German Patent 1,184,462. Thereby, the top of the ingot is kept in liquid state for a longer time than the lower end during solidification of the liquid steel. Thus, liquid steel can flow into the portion which had already solidified.
  • a procedure is known to decrease the piping formation, disclosed in German Patent 623,61 l, wherein the unlined mold is removed at an early stage, and the ingot is covered by a refractory cap. This is designed to keep the ingot top hot while accelerating cooling of the lower end.
  • the lack of heat insulation in the upper part of the mold entails carrying off of so much heat that an edge zone or casing forms on the ingot and simultaneously a cavity which is far inside the interior. Even an ensuing accelerated cooling of the ingot bottom while simultaneously keeping the top end hot, does not reverse the characteristic piping formation.
  • the reinforcement may be a steel sheet of 0.5 to L5 mm. thickness and may furthermore be integrally connectedto the plate surface or simply rest upon it.
  • the rising liquid steel fuses'with the reinforcement thus fastening the insert to the poured ingot. After severing the connection between insert and mold, the mold' can thus be removed without the insert. This has not been feasible with the molds hitherto known.
  • a smoothbore steel mill mold is shown as 1.
  • the insert In the upper part of mold l, the insert according to the invention is suspended.
  • the insert may be disposed at a selected height of the mold, depending on the desired weight of the ingot.
  • This insert consists of four individual refractory heat-insulating plates 2 to which metal strips 3 are fastened. These strips 3 are provided with holes at different height. Rods 4 are inserted into and through these holes and rest on the upper mold surface. Thereby, the insert is kept at the desired height.
  • Plates 2 carry reinforcements 6 which impart sufficient strength even after pouring. These reinforcements 6 are of sheet steel of 0.5-1.5 mm. thickness and are fastened to the plate surfaces facing the mold wall. This is accomplished by means of pins 7 which are urged through the steel sheet and the plates.
  • the reinforcements 6 are in the shape of rods which are integrally connected to the plates 2.
  • the reinforcements extends by a few centimeters beyond the lower edge of the plates so that a portion of the reinforcement protrudes into the interior of the mold.
  • the pins 7 extend beyond the free surfaces of plates 3. However, it suffices if either the pins extend or the reinforcement protrudes. The extending portion of the reinforcement fuses with the rising liquid steeland thus fastens the insert to the poured ingot.
  • the mold When the steel has solidified in the mold to such anextent that the ingot just separates from the mold wall and its core is still liquid, the mold is removed while the insert adheres to the ingot. After cooling, ingot and insert are heated to the temperature required for rolling in a vertical ingot furnace or pit furnace. The insert does not fall off in the furnace since it is fused to the ingot. Thus, the danger is averted that a liquid slag forms on the bottom of the furnace together with the scale.
  • the mold insert is separated from the ingot only in the rolling mill. Because the surface of the-piece tobe rolled precedes its center upon rolling, the reinforcement sheet is pushed ahead so far that it reaches the portion of the ingot which is cut off as scrap.
  • the molds provided with inserts according to the invention are successfully employed for casting of steels which are sensitive to heat cracking. Ingots made from such steels must be put into the ingot furnace at temperatures exceeding 900 C. In order to maintain these temperature limits, the conventional molds, especially on casting of heavy ingots, must be removed early enough, and the ingots charged rapidly enough, that the ingot head still is liquid when the ingot again is heated externally. Thereby, pronounced segregation occurs. According to the invention, the ingots, after removal of the mold, are cooled in the air for a short time until they have attained the required surface temperature. They then are transported in heat-insulated carts or dollies to the ingot furnace and installed therein. The ingot core, in this method, has solidified prior to the transport step so that no appreciable segregation occurs.
  • a removable insert for use in connection with a walled steel casting mold, comprising in combination:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US687547A 1966-12-20 1967-12-04 Steel casting mold insert Expired - Lifetime US3561722A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM0072083 1966-12-20

Publications (1)

Publication Number Publication Date
US3561722A true US3561722A (en) 1971-02-09

Family

ID=7314301

Family Applications (1)

Application Number Title Priority Date Filing Date
US687547A Expired - Lifetime US3561722A (en) 1966-12-20 1967-12-04 Steel casting mold insert

Country Status (8)

Country Link
US (1) US3561722A (enrdf_load_stackoverflow)
AT (1) AT279069B (enrdf_load_stackoverflow)
BE (1) BE707733A (enrdf_load_stackoverflow)
DE (1) DE1508912B1 (enrdf_load_stackoverflow)
FR (1) FR1548778A (enrdf_load_stackoverflow)
GB (1) GB1192819A (enrdf_load_stackoverflow)
LU (1) LU54796A1 (enrdf_load_stackoverflow)
NL (1) NL6717131A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785609A (en) * 1970-10-07 1974-01-15 A Daussan Device for the treatment of ferrous metal ingots which are intended to be removed from molds without hold-up periods
US3860059A (en) * 1972-03-27 1975-01-14 Foseco Int Method and apparatus for casting ingots

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1316156A (en) * 1970-07-06 1973-05-09 Foseco Trading Ag Hot topping ingot moulds

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1654057A (en) * 1927-01-13 1927-12-27 Central Alloy Steel Corp Hot top
US2433175A (en) * 1943-01-08 1947-12-23 Ferro Eng Co Refractory lining
US2782478A (en) * 1953-09-08 1957-02-26 United States Steel Corp Sectional hot top
US2946103A (en) * 1958-08-04 1960-07-26 Vallak Enn Hot tops
US3148421A (en) * 1961-10-31 1964-09-15 Treesdale Lab Inc Exothermic side board for ingot molds
US3208116A (en) * 1962-05-14 1965-09-28 United States Steel Corp Two part hot top

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485065A (en) * 1946-11-27 1949-10-18 American Steel & Wire Co Method of recessing the sinkhead of ingots and the like
GB863966A (en) * 1960-01-12 1961-03-29 Enn Vallak Improvements in or relating to hot tops for ingot and like moulds
FR1309266A (fr) * 1961-09-20 1962-11-16 Fonderite Plaque de revêtement pour lingotières ou moules
AT239459B (de) * 1962-10-02 1965-04-12 Nolten K G Blockformeinsatz für Gießformen der Stahlindustrie
FR82630E (fr) * 1962-11-15 1964-03-20 Fonderite Plaque de revêtement pour lingotières ou moules
US3165797A (en) * 1963-01-08 1965-01-19 Bate Micheal Donald La Hot top
US3212749A (en) * 1964-03-24 1965-10-19 Bate Micheal Donald La Consumable hot top with inserts of exothermic material
FR1408479A (fr) * 1964-09-01 1965-08-13 Sandvikens Jernverks Ab Rehausse de lingotière

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1654057A (en) * 1927-01-13 1927-12-27 Central Alloy Steel Corp Hot top
US2433175A (en) * 1943-01-08 1947-12-23 Ferro Eng Co Refractory lining
US2782478A (en) * 1953-09-08 1957-02-26 United States Steel Corp Sectional hot top
US2946103A (en) * 1958-08-04 1960-07-26 Vallak Enn Hot tops
US3148421A (en) * 1961-10-31 1964-09-15 Treesdale Lab Inc Exothermic side board for ingot molds
US3208116A (en) * 1962-05-14 1965-09-28 United States Steel Corp Two part hot top

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785609A (en) * 1970-10-07 1974-01-15 A Daussan Device for the treatment of ferrous metal ingots which are intended to be removed from molds without hold-up periods
US3860059A (en) * 1972-03-27 1975-01-14 Foseco Int Method and apparatus for casting ingots

Also Published As

Publication number Publication date
DE1508912B1 (de) 1969-09-04
NL6717131A (enrdf_load_stackoverflow) 1968-06-21
FR1548778A (enrdf_load_stackoverflow) 1968-12-06
LU54796A1 (enrdf_load_stackoverflow) 1968-01-31
BE707733A (enrdf_load_stackoverflow) 1968-04-16
GB1192819A (en) 1970-05-20
AT279069B (de) 1970-02-25

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