DE1029324B - Release agent consisting of silicates - Google Patents

Release agent consisting of silicates

Info

Publication number
DE1029324B
DE1029324B DE1956P0016779 DEP0016779A DE1029324B DE 1029324 B DE1029324 B DE 1029324B DE 1956P0016779 DE1956P0016779 DE 1956P0016779 DE P0016779 A DEP0016779 A DE P0016779A DE 1029324 B DE1029324 B DE 1029324B
Authority
DE
Germany
Prior art keywords
silicates
release agent
pipe
agent consisting
carburization
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.)
Pending
Application number
DE1956P0016779
Other languages
German (de)
Inventor
Dr Kurt Born
Dipl-Ing Kurtwalter Neuhoff
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.)
Phoenix Rheinrohr AG
Original Assignee
Phoenix Rheinrohr 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 Phoenix Rheinrohr AG filed Critical Phoenix Rheinrohr AG
Priority to DE1956P0016779 priority Critical patent/DE1029324B/en
Publication of DE1029324B publication Critical patent/DE1029324B/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/224—Anti-weld compositions; Braze stop-off compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0263—Lubricating devices using solid lubricants

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Description

Aus Silikaten bestehendes Trennmittel Beim Herstellen von Rohren aus austenitischen Stählen und rekristallisationsträgen anderen Metallen durch Warmwalzen werden häufig zwischen Dorn und Rohrinnenwand ein oder mehrere zumindest auf Walztemperatur befindliche zylindrische Metallkörper als Schutz gegen eine zu schnelle Abkühlung verwendet.Release agent consisting of silicates When manufacturing pipes from austenitic steels and other metals that are slow to recrystallize by hot rolling often one or more at least at rolling temperature between the mandrel and the inner wall of the pipe located cylindrical metal body as protection against too rapid cooling used.

Um dabei eine Verschweißung des Metallzylinders mit der Rohrinnenwand zu vermeiden, wird üblicherweise eine Trennschicht zwischen Rohr und Zylinder angebracht. Solche Trennschichten sollten neben guter Haftfestigkeit auch noch die Eigenschaft besitzen, eine Aufkohlung des Rohres zu verhindern, was besonders bei der Verarbeitung austenitischer Stähle unbedingt erforderlich ist.In order to weld the metal cylinder to the inner wall of the pipe To avoid this, a separating layer is usually applied between the tube and the cylinder. In addition to good adhesive strength, such separating layers should also have the property own to prevent carburization of the pipe, which is especially important during processing austenitic steels is absolutely necessary.

Man hat bereits kohlenstofffreie Trennmittel, z. B. Silikate, vorgeschlagen. Aber auch die Verwendung von Silikaten, z. B. von Kalziumsilikat, als Trennschicht hat keine befriedigenden Ergebnisse gebracht. Solche Überzüge sind nämlich gasdurchlässig, so d@aß der Luftsauerstoff, der zwischen dem zu walzenden Rohr und dem Metallzylinder eingeschlossen ist, mit dem Kohlenstoff dies letzteren reagiert, wenn dieser z. B. aus Stahl besteht. Dabei bildet sich Kohlenoxyd, das mit dem zu walzenden Rohr in Berührung kommt und dort Aufkohlungserscheinungen hervorruft.You already have carbon-free release agents, e.g. B. Silicates, suggested. But also the use of silicates, e.g. B. of calcium silicate, as a separating layer has not produced satisfactory results. Such coatings are gas-permeable, so d @ ate the oxygen in the air between the pipe to be rolled and the metal cylinder is included, with the carbon this latter reacts when this z. B. consists of steel. In the process, carbon oxide is formed, the one with the pipe to be rolled comes into contact and causes carburization there.

Daher wird erfindungsgemäß als Trennmittel eine Mischung aus Silikat und einem solchen Metall- oder Legierungspulver vorgeschlagen, das schon bei relativ niedriger Temperatur, d. h. unterhalb der Temperatur, bei der eine Aufkohlung möglich wird, mit dem Luftsauerstoff bis zur weitgehenden Abbi.ndung desselben reagiert und dadurch den Transport von Kohlenstoff über die Gasphase unterbindet.Therefore, according to the invention, a mixture of silicate is used as the release agent and such a metal or alloy powder proposed that already at relatively low temperature, d. H. below the temperature at which carburization is possible reacts with the oxygen in the air until it is largely broken down and thereby prevents the transport of carbon via the gas phase.

Beispielsweise kann ein Trennmittel nach der Erfindung aus einer wäßrigen Aufschlämmung von Kalziumsilikat bestehen, der einige Prozent solcher Metall- oder Legierungspulver zugesetzt sind. Als Metalle, die bei niedrigen Temperaturen mit Sauerstoff reagieren, sind Aluminium und Magnesium, ferner Cerium und Kalzium zu erwähnen. Eine solche Mischung wird dann auf die Innenoberfläche des Rohres und/oder die Außenoberfläche des zur Vermeidung einer zu schnellen Abkühlung verwendeten Metallzylinders aufgebracht, z. B. durch Anstreichen oder Aufspritzen. Auf diese Weise wird eine Aufkohlung des Rohres und eine Verschweißung mit dem eingefügten Metallzylinder mit Sicherheit vermieden.For example, a release agent according to the invention from an aqueous Slurry of calcium silicate are made up of a few percent of such metal or Alloy powder are added. As metals that use at low temperatures Oxygen react, aluminum and magnesium, furthermore cerium and calcium too mention. Such a mixture is then applied to the inner surface of the tube and / or the outer surface of the used to avoid cooling too quickly Metal cylinder applied, z. B. by painting or spraying. To this Way is a carburization of the pipe and a welding with the inserted one Metal cylinders definitely avoided.

Claims (1)

PATENTANSPRUCH: Aus Silikaten, vornehmlich aus Kalziumsilikat, bestehendes Trennmittel beim Warmwalzen von Rohren aus rekristallisationsträgen Werkstoffen, insbesondere austenitischen Chrom-Nickel-Stählen, zur Vermeidung von Anschweißungen zwischen den Rohren und in sie eingefügten Metallzylindern, das gleichzeitig :eine Aufkoh,lung des Rohres verhindert, dadurch gekennzeichnet, daß dem Silikat solche feinverteilten Metalle oder Legierungen beigemischt sind, die unterhalb der Temperatur einer möglichen Aufkohlung intensiv mit Sauerstoff reagieren. In Betracht gezogene Druckschriften: Französische Patentschrift Nr. 860412.PATENT CLAIM: Made up of silicates, primarily calcium silicate Release agent when hot rolling pipes made of materials that are slow to recrystallize, in particular austenitic chrome-nickel steels to avoid welds between the tubes and metal cylinders inserted into them, that at the same time: a Prevents carbonization of the pipe, characterized in that the silicate is such finely divided metals or alloys are mixed in, which are below the temperature react intensively with oxygen in the event of a possible carburization. Considered Publications: French Patent No. 860412.
DE1956P0016779 1956-08-03 1956-08-03 Release agent consisting of silicates Pending DE1029324B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1956P0016779 DE1029324B (en) 1956-08-03 1956-08-03 Release agent consisting of silicates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1956P0016779 DE1029324B (en) 1956-08-03 1956-08-03 Release agent consisting of silicates

Publications (1)

Publication Number Publication Date
DE1029324B true DE1029324B (en) 1958-05-08

Family

ID=589196

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1956P0016779 Pending DE1029324B (en) 1956-08-03 1956-08-03 Release agent consisting of silicates

Country Status (1)

Country Link
DE (1) DE1029324B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR860412A (en) * 1939-06-19 1941-01-14 Auxiliaire Des Laminoirs Acier Sheet metal processing process

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR860412A (en) * 1939-06-19 1941-01-14 Auxiliaire Des Laminoirs Acier Sheet metal processing process

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