US3623537A - Casting of ingots - Google Patents

Casting of ingots Download PDF

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Publication number
US3623537A
US3623537A US876616A US3623537DA US3623537A US 3623537 A US3623537 A US 3623537A US 876616 A US876616 A US 876616A US 3623537D A US3623537D A US 3623537DA US 3623537 A US3623537 A US 3623537A
Authority
US
United States
Prior art keywords
pad
ingot mould
agents
foam material
teeming
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
US876616A
Other languages
English (en)
Inventor
Roger Mervyn Hilton
John Frances Xavier Watkinson
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.)
Foseco International Ltd
Original Assignee
Foseco International 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 Foseco International Ltd filed Critical Foseco International Ltd
Application granted granted Critical
Publication of US3623537A publication Critical patent/US3623537A/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
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing

Definitions

  • ABSTRACT Splash during teeming ingots is minimized by locating a foam pad in the ingot mould prior to use.
  • the present invention relates to the casting of ingots, particularly to the casting of steel ingots.
  • bottom poured ingots generally have a markedly improved surface quality as compared with top poured ingots, but for many reasons it is neither practical nor convenient to adopt to a bottom pouring technique in order merely to achieve improved surface quality. It is believed that the poor surface quality of top poured ingots results from the extreme turbulence and splashing during teeming especially near the commencement of teeming.
  • a method of reducing splash at the commencement of molten metal teeming into an ingot mould which comprises, prior to commencement of teeming, locating in the ingot mould a pad of foam material.
  • the foam material is of organic nature, or contains organic materials.
  • decomposition of the foam by the heat of the molten metal created a reducing atmosphere in the ingot mould, which it is believed, helps also to improve the surface quality of the final cast ingot.
  • Suitable foam materials are foamed polyurethanes and polystyrenes, in which flame retardent additives are desirably included.
  • the foam pad may be a pad of foamed slag material.
  • the thickness of the foam pad will vary depending upon its thermal resistance and the height of the ingot mould in which it is used (i.e. the height from which the metal stream falls). However, it will generally be of the order of at least cm. in thickness and it may be desirable to substantially fill the ingot mould with the foam. It is usually desirable to use a fairly spongy foam to absorb the impact of the molten metal efi'rciently.
  • the foam pad may be prepared externally of the mould and introduced into the mould, or may be created in situ in the mould by including in the mould the precursors for the foamed material and carrying out the foaming operation in the mould itself by methods known per se for the production of foamed products.
  • the foam pad of the present invention in addition to its use in preventing splash, may also be used as a carrier for various metal treatment agents.
  • various metal treatment agents e.g. fluorides, fly ash
  • iron rimming e.g. iron mill scale, hematite, various other oxygen containing compounds and powdered aluminum.
  • ingots cast using the method of the present invention have greatly improved surface quality, with a very low incidence of scabs, cracks and inclusions.
  • a method of reducing splash at the commencement of molten metal teeming into an ingot mould which comprises, prior to the commencement of teeming, locating in the ingot mould a pad of foam material selected from the class consisting of foamed polyurethane and foamed polystyrene.
  • foam material includes flame-retardent additives.
  • a method of reducing splash at the commencement of molten metal teeming into an ingot mould which comprises, prior to the commencement of teeming, locating in the ingot mould a pad of foam material comprising foamed slag.
  • a method according to claim I which includes the step of introducing foam precursors into the ingot mould and generating said pad of foam material in situ.
  • a method according to claim 6 wherein the said agents are selected from the class consisting of fluxing agents, and iron rimming, killing and deoxidizing agents.
  • a method according to claim 3 which includes the step of introducing foam precursors into the ingot mould and generating the pad of foamed slag in situ.
  • metal treatment agents are selected from the class consisting of fluxing agents, and iron rimming, killing and deoxidizing agents.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US876616A 1968-11-14 1969-11-13 Casting of ingots Expired - Lifetime US3623537A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5415968 1968-11-14

Publications (1)

Publication Number Publication Date
US3623537A true US3623537A (en) 1971-11-30

Family

ID=10470120

Family Applications (1)

Application Number Title Priority Date Filing Date
US876616A Expired - Lifetime US3623537A (en) 1968-11-14 1969-11-13 Casting of ingots

Country Status (3)

Country Link
US (1) US3623537A (enrdf_load_stackoverflow)
DE (1) DE1957127A1 (enrdf_load_stackoverflow)
GB (1) GB1234640A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810506A (en) * 1971-12-04 1974-05-14 Aikoh Co Molding for use in steel ingot making by bottom pouring and method of making steel ingot
US7219449B1 (en) 1999-05-03 2007-05-22 Promdx Technology, Inc. Adaptively controlled footwear

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182363A (en) * 1962-10-03 1965-05-11 Eastern Splash Mats Inc Ingot mold teeming method
US3195853A (en) * 1963-03-18 1965-07-20 Eastern Splash Mats Inc Chill mat

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182363A (en) * 1962-10-03 1965-05-11 Eastern Splash Mats Inc Ingot mold teeming method
US3195853A (en) * 1963-03-18 1965-07-20 Eastern Splash Mats Inc Chill mat

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810506A (en) * 1971-12-04 1974-05-14 Aikoh Co Molding for use in steel ingot making by bottom pouring and method of making steel ingot
US7219449B1 (en) 1999-05-03 2007-05-22 Promdx Technology, Inc. Adaptively controlled footwear

Also Published As

Publication number Publication date
GB1234640A (enrdf_load_stackoverflow) 1971-06-09
DE1957127A1 (de) 1970-10-29

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