AT84755B - Alloys of metals of the iron and chromium group with silicon or its compounds and processes for the production of these alloys. - Google Patents
Alloys of metals of the iron and chromium group with silicon or its compounds and processes for the production of these alloys.Info
- Publication number
- AT84755B AT84755B AT84755DA AT84755B AT 84755 B AT84755 B AT 84755B AT 84755D A AT84755D A AT 84755DA AT 84755 B AT84755 B AT 84755B
- Authority
- AT
- Austria
- Prior art keywords
- alloys
- silicon
- iron
- metals
- compounds
- Prior art date
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
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Legierungen aus Metallen der Eisen-und Chromgruppe mit Silizium oder dessen Verbindungen und Verfahren zur Herstellung dieser Legierungen.
Die bekannten säurebeständigen Legierungen des Siliziums z, B. mit Eisen habon in kristallisierter Form gegenüber dem flüssigen Zustand ein relativ geringes Lösungsvermögen für Kohlenstoff, das mit steigendem Siliziumgehalt noch abnimmt. Diese Legierungen scheiden bei ihrer Erstarrung allen über das Eutektikum hinaus von der flüssigen Schmelze gelösten Kohlenstoff ab, welche Erscheinung in der Praxis als die unangenehme"Garschaumgraphitbildung"bekannt ist, die, in grossen Nestern die Gussstücke durchziehen, diese vielfach unbrauchbar macht. Man hat deshalb den Kohlenstoffgehalt dieser Legierungen möglichst niedrig bemessen. Gleichzeitig wollte man hiemit auch die unerwünschte Härte herabsetzen.
Natürlich ist es praktisch unmöglich, in industriellem Massstabe diese Legierungen kohlefrei zu erzeugen. Es wurde nun gefunden, dass, ganz im Gegensatz hiezu, die Härte mit steigendem Kohlenstoffgehalt beträchtlich sinkt, so dass z. B. bei Siliziumgehalten zwischen ig/o und 25% bei einem Kohlenstoffgehalt von über o'65"/ eine wesentliche
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von Siliziumcementit so weit als möglich verhindert und der Kohlenstoff zum überwiegenden Teil in die Graphitmodifikation übergeleitet wird.
Dieses lässt sich am sichersten dadurch erreichen, dass man die Legierungen in den Gussformen aus einem Temperaturintervall langsam erstarren lässt, das möglichst nahe ihrem Schmelzpunkt liegt, im Gegensatz zum Erstarren aus höheren Temperaturen, bei dem es zur Bildung des hartmachenden Siliziumcementits kommt. Durch die angegebenen Massnahmen werden die Legierungen sehr feinkörnig, weich und bearbeitbar.
PATENT-ANSPRÜCHE : I. Legierungen aus Metallen der Eisen-und Chromgruppe mit Silizium oder dessen Verbindungen, gekennzeichnet durch einen Kohlenstoffgehalt von über order weitmöglichst in Modifikation des Graphits auftritt.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
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Alloys of metals of the iron and chromium group with silicon or its compounds and processes for the production of these alloys.
The known acid-resistant alloys of silicon, for example with iron, have a relatively low dissolving power for carbon in crystallized form compared to the liquid state, which decreases with increasing silicon content. As they solidify, these alloys separate all of the carbon that has been dissolved from the liquid melt beyond the eutectic, a phenomenon known in practice as the unpleasant "cooking foam graphite formation" which, in large nests through the castings, often makes them unusable. The carbon content of these alloys has therefore been kept as low as possible. At the same time the aim was to reduce the undesirable hardness.
Of course, it is practically impossible to produce these alloys on an industrial scale without carbon. It has now been found that, in stark contrast to this, the hardness decreases considerably with increasing carbon content, so that, for. B. with silicon contents between ig / o and 25% with a carbon content of over o'65 "/ a substantial
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prevented by silicon cementite as much as possible and the carbon is mainly converted into the graphite modification.
The safest way to achieve this is to allow the alloys in the casting molds to solidify slowly from a temperature range that is as close as possible to their melting point, as opposed to solidifying from higher temperatures, which leads to the formation of the hardening silicon cementite. The specified measures make the alloys very fine-grained, soft and machinable.
PATENT CLAIMS: I. Alloys of metals of the iron and chromium groups with silicon or its compounds, characterized by a carbon content of over or as far as possible in a modification of graphite.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE84755X | 1920-01-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT84755B true AT84755B (en) | 1921-07-11 |
Family
ID=5640530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT84755D AT84755B (en) | 1920-01-07 | 1920-03-10 | Alloys of metals of the iron and chromium group with silicon or its compounds and processes for the production of these alloys. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT84755B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1239715B (en) * | 1957-10-12 | 1967-05-03 | Res Inst Iron Steel | Process for the production of nodular steels in the as-cast state |
-
1920
- 1920-03-10 AT AT84755D patent/AT84755B/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1239715B (en) * | 1957-10-12 | 1967-05-03 | Res Inst Iron Steel | Process for the production of nodular steels in the as-cast state |
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