DE521432C - Process for the production of a high-quality gray cast iron - Google Patents

Process for the production of a high-quality gray cast iron

Info

Publication number
DE521432C
DE521432C DEM84924D DEM0084924D DE521432C DE 521432 C DE521432 C DE 521432C DE M84924 D DEM84924 D DE M84924D DE M0084924 D DEM0084924 D DE M0084924D DE 521432 C DE521432 C DE 521432C
Authority
DE
Germany
Prior art keywords
cast iron
gray cast
iron
production
quality gray
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
DEM84924D
Other languages
German (de)
Inventor
Dr-Ing Emil Schuez
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.)
Meier & Weichelt
Original Assignee
Meier & Weichelt
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 Meier & Weichelt filed Critical Meier & Weichelt
Priority to DEM84924D priority Critical patent/DE521432C/en
Application granted granted Critical
Publication of DE521432C publication Critical patent/DE521432C/en
Expired legal-status Critical Current

Links

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
    • C21C1/00—Refining of pig-iron; Cast iron

Landscapes

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

Description

Verfahren zur Herstellung eines hochwertigen Graugusses Es ist bekannt, daß im Grauguß bei langsamer Abkühlung der nichtgebundene Kohlenstoff als Graphit ausfällt sowie daß durch nachfolgendes Glühen auch der gebundene Kohlenstoff ausgeschieden werden kann, so daß der gesamte Kohlenstoff in freier Form enthalten ist. Der Kohlenstoff tritt hierbei in grober Form auf, z. B. in langen Adern oder Blättern, die das Grundmetall unterbrechen. Die Festigkeit ist dadurch erheblich verringert.Process for the production of a high-quality gray cast iron It is known that in gray cast iron, with slow cooling, the non-bonded carbon becomes graphite precipitates and that the bound carbon is also precipitated by subsequent annealing so that all of the carbon is contained in free form. The carbon occurs here in rough form, e.g. B. in long veins or leaves that make up the base metal interrupt. The strength is considerably reduced as a result.

Im Gegensatz hierzu besteht die vorliegender Erfindung zugrunde liegende neue Aufgabe darin, einen hochwertigen Grauguß dadurch herzustellen, daß der freie Kohlenstoff nur in sehr feiner Verteilung zur Abscheidung gebracht wird.In contrast to this, the present invention is based new task in producing a high-quality gray cast iron that the free Carbon is only made to deposit in a very fine distribution.

Eine außerordentlich feine Verteilung liegt bekanntlich bei einem Restgemisch (Eutektikum) vor. Dies ist auch bei der als Graphiteutektikum bezeichneten Gefügeart der Fall. Das Graphiteutektikum. ist jedoch bisher nur zufällig entstanden und selten beobachtetworden. Es waren weder die Möglichkeit einer planmäßigen Darstellung noch die besonderen Eigenschaften dieses Gefüges bekannt.As is well known, there is an extraordinarily fine distribution in one Residual mixture (eutectic) before. This is also known as the graphite eutectic Structure type the case. The graphite eutectic. has so far only emerged by chance and has rarely been observed. There was neither the possibility of a planned representation the special properties of this structure are still known.

Durch eingehende Versuche wurde festgestellt, daß es möglich ist, das Graphiteutektikum planmäßig herzustellen. Ferner wurde gefunden, daß besonders durch die feine Verteilung des Kohlenstoffs ausgezeichnete Eigenschaften des Gusses erzielt werden.Thorough experiments have shown that it is possible to produce the graphite eutectic according to plan. It has also been found that particularly Excellent properties of the casting due to the fine distribution of the carbon be achieved.

Nach der Erfindung wird die Abscheidung des Kohlenstoffs in der gekennzeichneten feinen Verteilung durch eine übliche Gattierung mit etwa 3,5 % Si und durch entsprechend geregelte Wärmeentziehung, z. B. durch Gießen in Eisenformen, also mit den gewöhnlichen, aber in dieser Verbindung neuen Mitteln des Gießereibetriebes erzielt. Der Kohlenstoff ist dann über den ganzen Querschnitt in dieser fein verteilten Form ausgeschieden in einem Grundstoff von Ferrit. Das Gefüge enthält außerdem noch Einlagerungen von feinstreifigem Perlit. Am Rande können Stellen von Weißeisen auftreten. Dieses Weißeisen kann zugleich mit dem erwähnten Perlit durch kurzes Glühen oberhalb Ar, leicht zum Zerfall gebracht werden. Werden alle Gußstücke kurz geglüht, so geht man sicher, daß in jedem Falle der ganze Querschnitt nur aus Ferrit besteht, in welchem der Kohlenstoff in gleichmäßig verteilten, äußerst fein ausgeschiedenen Teilchen enthalten ist.According to the invention, the deposition of the carbon in the characterized fine distribution is carried out by a conventional charge with about 3.5 % Si and by appropriately regulated heat extraction, e.g. B. achieved by casting in iron molds, so with the usual, but in this connection new means of the foundry. The carbon is then deposited in this finely divided form over the entire cross-section in a base material of ferrite. The structure also contains deposits of fine-grained perlite. White iron spots may appear on the edge. At the same time as the pearlite mentioned, this white iron can easily be brought to disintegration by briefly annealing above Ar. If all castings are briefly annealed, one can be certain that in each case the entire cross-section consists only of ferrite, in which the carbon is contained in evenly distributed, extremely finely separated particles.

Das nach dem Verfahren hergestellte Gußeisen zeichnet sich durch eine hohe Festigkeit bei gleichzeitig außerordentlich leichter Bearbeitbarkeit aus. Die Zugfestigkeit beträgt beispielsweise- 3o. bis--361Lg/qmm, die Biegefestigkeit 5o bis 8o kg/qmm bei verhältnismäßig großer Durchbiegung. Ferner erleidet der Guß bei hoher Erhitzung keine Gefügeänderung und damit auch keine bleibende Raumänderung im Gegensatz zu den perliti schen Eisensorten. Der Guß ist daher für den Gebrauch bei höheren Wärmegraden sehr geeignet. Er ist dampfdicht.The cast iron produced by the process draws high strength combined with extremely easy machinability the end. The tensile strength is for example -3o. up to - 361Lg / sqmm, the flexural strength 5o to 8o kg / sqmm with a relatively large deflection. Furthermore, the casting suffers no structural change at high heating and therefore no permanent change in space in contrast to the pearlite iron types. The cast is therefore for use very suitable for higher temperatures. It's vapor-tight.

Claims (1)

PATENTANSPRÜCIt: Verfahren zur Herstellung :eines hochwertigen Graugusses mit Zugfestigkeiten über z8 kg/qmm, dadurch gekennzeichnet, daß ein Eisen mit hohem, etwa 3,5 % betragendem Siliciumgehalt unter entsprechend geregelter Wärmeentziehung, z. B. durch Gießen in Eisenformen vergossen wird, derart, daß der freie Kohlenstoff als Graphiteutektikum unter Ausschluß von Blättchengraphit in der metallischen Grundmasse gleichmäßig verteilt ist.PATENT APPLICATION: Process for manufacturing: a high-quality gray cast iron with tensile strengths over z8 kg / qmm, characterized in that an iron with high, about 3.5% silicon content with appropriately regulated heat extraction, z. B. is cast by casting in iron molds, such that the free carbon as a graphite eutectic with the exclusion of flake graphite in the metallic matrix is evenly distributed.
DEM84924D 1924-05-14 1924-05-14 Process for the production of a high-quality gray cast iron Expired DE521432C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM84924D DE521432C (en) 1924-05-14 1924-05-14 Process for the production of a high-quality gray cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM84924D DE521432C (en) 1924-05-14 1924-05-14 Process for the production of a high-quality gray cast iron

Publications (1)

Publication Number Publication Date
DE521432C true DE521432C (en) 1931-03-20

Family

ID=7320059

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM84924D Expired DE521432C (en) 1924-05-14 1924-05-14 Process for the production of a high-quality gray cast iron

Country Status (1)

Country Link
DE (1) DE521432C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE766592C (en) * 1938-09-28 1953-09-28 Goetzewerke Process for producing gray cast iron of higher strength

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE766592C (en) * 1938-09-28 1953-09-28 Goetzewerke Process for producing gray cast iron of higher strength

Similar Documents

Publication Publication Date Title
CH268905A (en) Heat-resistant, ferritic alloy.
DE521432C (en) Process for the production of a high-quality gray cast iron
DE703727C (en) Process for the manufacture of cast iron objects with a hardened surface
DE882936C (en) Process for the production of chrome coatings by electrolysis of acidic chrome baths
AT72606B (en) Process for the production of metal objects composed of various layers.
DE490351C (en) Process for producing a coating of aluminum or its alloys on iron bodies
DE900615C (en) Process for the production of hard metal alloys for tools and work equipment
DE646605C (en) Process for the production of beryllium alloys
DE635189C (en) Process for the production of gray pig iron with a low silicon content not exceeding 0.6%
AT76415B (en) Process for the production of steel tools for working iron and other hard materials by casting in permanent molds.
DE519066C (en) Iron-silicon alloys
DE587117C (en) Process for the production of shaped objects of high strength from carbides in alloy with metal or metalloid
DE946842C (en) Mold for casting metals and method for producing casting molds
DE589257C (en) Process for the production of high quality malleable cast iron
DE331864C (en) Process for the production of acid-resistant iron alloys
DE609319C (en) Process for the production of gray cast iron with high tensile strength
DE940776C (en) Process for the production of iron mass cores for self-induction coils
AT150283B (en) Process for the production of gray pig iron from white or mottled pig iron.
DE1009650B (en) Process for the manufacture of foundry iron that is cast on the casting machine
DE502933C (en) Process for the production of composite castings using partitions
DE584841C (en) Process for the production of high quality gray cast iron
DE1608241C (en) Process for the production of a cast iron mold which is used for the production of glass bodies
DE940902C (en) The use of moldings, especially pigs, made of vanadic acid for alloying steel strips
DE2140022B2 (en) PROCESS FOR MANUFACTURING PIPES FROM CAST IRON IN METALLIC CAST IRON CHILLES
DE702629C (en) Production of homogeneous metal carbide bodies of given dimensions