EP0076541B1 - Blockform aus Gusseisen zum Giessen von Stahlblöcken und deren Herstellungsverfahren - Google Patents

Blockform aus Gusseisen zum Giessen von Stahlblöcken und deren Herstellungsverfahren Download PDF

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Publication number
EP0076541B1
EP0076541B1 EP19820201205 EP82201205A EP0076541B1 EP 0076541 B1 EP0076541 B1 EP 0076541B1 EP 19820201205 EP19820201205 EP 19820201205 EP 82201205 A EP82201205 A EP 82201205A EP 0076541 B1 EP0076541 B1 EP 0076541B1
Authority
EP
European Patent Office
Prior art keywords
mould
cast
ingot
content
iron
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
Application number
EP19820201205
Other languages
English (en)
French (fr)
Other versions
EP0076541A2 (de
EP0076541A3 (en
Inventor
Cornelis Dr. Ir. Vermande
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.)
Tata Steel Ijmuiden BV
Original Assignee
Hoogovens Groep BV
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 Hoogovens Groep BV filed Critical Hoogovens Groep BV
Publication of EP0076541A2 publication Critical patent/EP0076541A2/de
Publication of EP0076541A3 publication Critical patent/EP0076541A3/en
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Publication of EP0076541B1 publication Critical patent/EP0076541B1/de
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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
    • B22D7/06—Ingot moulds or their manufacture
    • 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
    • B22D7/066—Manufacturing, repairing or reinforcing ingot moulds
    • B22D7/068—Manufacturing, repairing or reinforcing ingot moulds characterised by the materials used therefor

Definitions

  • This invention relates to a cast-iron ingot mould for use in the production of steel ingots in the steel industry, and to a method of manufacturing such an ingot mould.
  • the starting material is often steel ingots which have been obtained by casting liquid steel into a cast-iron ingot mould and allowing the steel to solidify at least partly in the ingot mould.
  • Such an ingot mould is a thick-walled hollow cast-iron body open at both ends and with a slightly tapering shape so that the ingot mould can be stripped from the cast steel ingot.
  • the ingot mould is located on a heavy metal ingot plate, which defines the bottom of the ingot. The foot of the ingot mould contacts the plate.
  • German Offenlegungsschrift 1 758 706, forming the first part of claim 1, describes a liquid cast-iron composition for the production of ingot mould, which contains:
  • this liquid cast iron is enriched with substantial quantities of silicon, either in a metallic form or as a metal alloy of silicon, in order to achieve a silicon content in the cast ingot mould which is between 0.4 and 0.5% higher than the Mn content.
  • the Si content in the ingot mould could be between 1.2 and 2.4%.
  • the present invention has the object of improving the quality of cast-iron ingot moulds, in particular ingot moulds which are to be used for the production of heavy ingots in the weight range of 24 tons and-above, and is especially concerned at minimizing the problem of broken feet, especially by the use of a process which is of low cost and is easily carried out.
  • the invention therefore consists in a cast-iron ingot mould with an analysis (by weight) of the cast-iron of: wherein the Si-content is smaller than the Mn-content.
  • the sulphur content is between 0.015 and 0.25%.
  • the Si-content is between 0.55 and 0.75% and the Mn content 0.74 and 0.95% but alternatively the Si-content may be between 1.0 and 1.15% and the Mn-content between 1.1 and 1.3%.
  • a phosphorus content between 0.14 and 0.195% is unusually high for a cast-iron analysis. Nevertheless it has been found that this high phosphorus percentage definitely improves the life-span of ingot moulds of the above new composition, particularly by effectively counteracting the phenomenon of broken feet.
  • the invention relates to not only the ingot mould, but also to a method for the manufacture of the ingot moulds according to the present invention as described above.
  • a cast-iron composition of the analysis (by weight): is enriched with P by the addition of suitable amounts of an iron-phosphorus alloy.
  • this new method has clear advantages. These consist in that firstly no abnormal production scheme has to be used in operating the blast furnace, and secondly the addition of a phosphorus alloy to the cast-iron makes possible a much more accurate adjustment of the phosphorus content within the desired limits.
  • ingot moulds according to the invention can reduce the percentage of broken feet to only a fraction of the previously usual percentage. This effects a substantial reduction in the costs of the use of ingot moulds and of repair of ingot moulds with broken feet, which in turn results into a substantial lowering of the cost of the cast steel ingots.
  • the cast steel ingots manufactured with the ingot moulds of the invention can have a smoother surface near the ingot mould foot, which provides advantages in the further conversion of the steel ingots into rolled products.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Claims (8)

1. Gußeiserne Kokille für die Verwendung bei der Herstellung von Stahlingots, wobei das Gußeisen aus Eisen, Kohlenstoff, Silicium, Mangan, Schwefel, Phosphor und üblichen Verunreinigungen besteht, dadurch gekennzeichnet, daß zumindest in einem Bereich der Kokillenfuß-Region die Gehalte der genannte_n_Elemente in Kombination betragen:
Figure imgb0006
Rest Eisen und übliche Verunreinigungen
und daß der Siliciumgehalt kleiner ist als der Mangangehalt.
2. Kokille nach Anspruch 1, dadurch gekennzeichnet, daß der Schwefelgehalt zwischen 0,015 und 0,025 Gew.-% beträgt.
3. Kokille nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Siliciumgehalt zwischen 0,55 und 0,75 Gew.-% und der Mangangehalt zwischen 0,74 und 0,95 Gew.-% beträgt.
4. Kokille näch Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Siliciumgehalt zwischen 1,0 und 1,15 Gew.-% und der Mangangehalt zwischen 1,1 und 1,3 Gew.-% beträgt.
5. Kokille näch einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Phosphorgehalt zwischen 0,16 und 0,18 Gew.-% beträgt.
6. Kokille nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß außerhalb des genannten Bereichs in der Kokillenfuß-Region das Gußeisen der Kokille einen Phosphorgehalt aufweist, der ungefähr 0,06 Gew.-% niedriger ist als in dem genannten Bereich der Kokillenfuß-Region.
7. Verfahren zur Herstellung einer Kokille nach Anspruch 1, dadurch gekennzeichnet, daß vor dem Guß der Kokille eine Gußeisenzusammensetzung, bestehend aus
Figure imgb0007
Rest Eisen und übliche Verunreinigungen,
durch Zusatz von geeigneten Mengen an einer Eisen-Phosphor-Legierung mit Phosphor angereichert und dann zum Gießen der genannten Kokille verwendet wird.
EP19820201205 1981-10-05 1982-09-28 Blockform aus Gusseisen zum Giessen von Stahlblöcken und deren Herstellungsverfahren Expired EP0076541B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8104509A NL8104509A (nl) 1981-10-05 1981-10-05 Blokvorm ten behoeve van het gieten van staalblokken en werkwijze voor de vervaardiging van deze blokvorm.
NL8104509 1981-10-05

Publications (3)

Publication Number Publication Date
EP0076541A2 EP0076541A2 (de) 1983-04-13
EP0076541A3 EP0076541A3 (en) 1984-07-18
EP0076541B1 true EP0076541B1 (de) 1986-08-20

Family

ID=19838159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820201205 Expired EP0076541B1 (de) 1981-10-05 1982-09-28 Blockform aus Gusseisen zum Giessen von Stahlblöcken und deren Herstellungsverfahren

Country Status (4)

Country Link
EP (1) EP0076541B1 (de)
CA (1) CA1179804A (de)
DE (1) DE3272740D1 (de)
NL (1) NL8104509A (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1806753A (en) * 1931-05-26 Ingot mold
DE1134691B (de) * 1957-10-16 1962-08-16 Hessische Berg Und Huettenwerk Verwendung eines Giesserei-Roheisens als Kokillen-Werkstoff
DE1758706B2 (de) * 1968-07-25 1973-03-29 Hüttenwerk Oberhausen AG, 4200 Oberhausen Verfahren zur herstellung von stahlwerkskokillen

Also Published As

Publication number Publication date
EP0076541A2 (de) 1983-04-13
CA1179804A (en) 1984-12-27
NL8104509A (nl) 1983-05-02
DE3272740D1 (en) 1986-09-25
EP0076541A3 (en) 1984-07-18

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