DE693074C - Process for pickling carburized areas or rolled-in metal or slag particles from bare, rust-proof chrome steels - Google Patents

Process for pickling carburized areas or rolled-in metal or slag particles from bare, rust-proof chrome steels

Info

Publication number
DE693074C
DE693074C DE1937H0157192 DEH0157192D DE693074C DE 693074 C DE693074 C DE 693074C DE 1937H0157192 DE1937H0157192 DE 1937H0157192 DE H0157192 D DEH0157192 D DE H0157192D DE 693074 C DE693074 C DE 693074C
Authority
DE
Germany
Prior art keywords
pickling
rolled
metal
rust
proof
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
DE1937H0157192
Other languages
German (de)
Inventor
Dr-Ing Johann Kuschmann
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.)
Hoesch AG
Original Assignee
Hoesch 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
Priority claimed from DEH140540D external-priority patent/DE657539C/en
Application filed by Hoesch AG filed Critical Hoesch AG
Priority to DE1937H0157192 priority Critical patent/DE693074C/en
Application granted granted Critical
Publication of DE693074C publication Critical patent/DE693074C/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08Iron or steel
    • C23G1/086Iron or steel solutions containing HF

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Description

Verfahren zum Abbeizen aufgekohlter Stellen oder eingewalzter Metall- oder Schlackteilchen von blanken, nichtrostenden Chromstählen Gegenstand des Patents 657 539 isteinVerfahren zum Entzundern von nichtrostenden Chromstählen mit 15 bis 30% Chrom und wenig sonstigen, die Säurelöslichkeit herabsetzenden Zusätzen, wie Nickel, Kupfer, Molybdän, bei dem eine salzsäurefreie Beizflüssigkeit verwendet wird, die 16 bis 30% konzentrierte Salpetersäure vom spezifischen Gewicht 44 und i bis 5% 70%ige Flußsäwre enthält. Diese Beizflüssigkeit hat den besonderen Vorteil, daß sie nur an den Stellen des Bleches wirkt, an denen Zunder sitzt. Es werden also nur die fest anhaftenden Zuüder.-teilchen abgelöst, ohne daß ein wesentlicher Angriff auf den Stahl selbst erfolgt.Process for stripping carburized areas or rolled-in metal or slag particles from bright, stainless chromium steels are the subject of the patent 657 539 is a process for descaling stainless chromium steels with 15 to 30% chromium and a few other additives that reduce the acid solubility, such as Nickel, copper, molybdenum using a pickling liquid free from hydrochloric acid is, the 16 to 30% concentrated nitric acid of the specific gravity 44 and i contains up to 5% 70% hydrofluoric acid. This pickling liquid has the particular advantage that it only works in the places on the sheet where there is scale. So it will be only the firmly adhering sugar particles are detached, without any substantial attack takes place on the steel itself.

Es hat sich nun herausgestellt, daß die gleiche Beize erfindungsgemäß,auch dazu benutzt werden kann, bei an .sich blanken Stahlproben der vorgenannten Zusammensetzung alle die Stellen abzubeizen, an denen eine,Aufkohlung des Stahles oder ein Einwalzen von Schlacken- oder Metallteilchen stattgefunden hat. Während nämlich der vorbeschriebene Stahl die besten Korrosionseigenschaften aufweist, wenn die Kohlenstoffgehalte unter 0,o8 % betragen, allenfalls auch noch unter o,io%, gehen diese guten korrosionseigentschaften -verloren, wenn der Stahl an der Oberfläche an mehr oder weniger umfangreichen. Stellen durch Zufälligkeiten beim Glühen eine Aufkohlung erfahren hat. Der Stahl ist dabei an sich- durch Schmirgeln oder auch Beizen blank, aber er hat, wie gesagt, doch nicht mehr die guten korrosionseigeenn.-schaften und, rostet z. B. im Seewassersprühnebel. Wenn* man die genannten Stahlstücke nunmehr mit der beschriebenen Beizflüssigkeit behandelt, so werden nur diese Stellen örtlicher Aufkoblung angegriffen und- abgeleiit, und es bleibt der Stahl mit seiner ursprünglichen guten Beschaffenheit, also mit guten Korrosionseigenschaften. Das gleiche tritt ein, wenn beim Walzen Eisen- oder Schlackenteilchen in die Oberfläche des Stahles eiregergvalzt worden sind. Auch diese eingewalzten Teilchen werden durch die Beize restlos entfernt.It has now been found that the same stain according to the invention, too can be used for this in the case of intrinsically bare steel samples of the aforementioned composition pickling all the places where a, carburization of the steel or a rolling of slag or metal particles has taken place. While the above-described Steel exhibits the best corrosion properties when the carbon content is below 0, o8%, at best even below o, io%, these good corrosion properties go - lost when the steel on the surface is more or less extensive. Places has undergone carburization due to coincidences during annealing. The Steel is shiny in itself - by sanding or pickling, but, as I said, but no longer the good corrosion properties and, for example, rusts. B. in sea water spray. If * you can now use the pickling liquid described above to use the steel pieces mentioned treated, only these places become more local Aufkoblung attacked and - derived, and the steel remains in its original good condition, thus with good corrosion properties. The same occurs when rolling Iron or slag particles have been rolled into the surface of the steel are. These rolled-in particles are also completely removed by the stain.

Der Zeitpunkt der Beizung richtet sichnac:h den örtlichen Erfordernissen. Will man eine ganz saubere Oberfläche erzielen, so legt man die Beize vor dem Kaltwalzen ein. Da die Beize anderseits den gesunden Stahl praktisch gar nicht angreift, wird die Beizung als eine Art Sicherheit und zur Beseitigung der kleinen, durch den letzten Verarbeitungsgang erzeugten Störungsstellen an den fertigen Gegenständen durchgeführt.The time of pickling depends on: h the local requirements. If you want to achieve a completely clean surface, the stain is placed before cold rolling a. Since, on the other hand, the stain practically does not attack healthy steel at all, the pickling as a kind of security and to remove the small, by the last Processing operation generated faults carried out on the finished objects.

Claims (1)

PATENTANSPRUCH: Verwendung der durch Patent 657 539 geschützten Beizflüssigkeit zum Abbeizen aufgekohlter Stellen oder eingewalzter Metall- oder Schlackenteilchen von blanken, nichtrostenden Chromstählen mit 15 bis 3o% Chrom und wenig sonstigen, die Säurelöslichkeit herabsetzenden Zusätzen, wie Nickel, Kupfer und Molybdän.PATENT CLAIM: Use of the pickling liquid protected by patent 657 539 for pickling carburized areas or rolled-in metal or slag particles of bright, rust-proof chromium steels with 15 to 3o% chromium and little else, Acid-reducing additives such as nickel, copper and molybdenum.
DE1937H0157192 1934-06-29 1937-09-23 Process for pickling carburized areas or rolled-in metal or slag particles from bare, rust-proof chrome steels Expired DE693074C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1937H0157192 DE693074C (en) 1934-06-29 1937-09-23 Process for pickling carburized areas or rolled-in metal or slag particles from bare, rust-proof chrome steels

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEH140540D DE657539C (en) 1934-06-29 1934-06-29 Process for removing hot scale from stainless chromium steels
DE1937H0157192 DE693074C (en) 1934-06-29 1937-09-23 Process for pickling carburized areas or rolled-in metal or slag particles from bare, rust-proof chrome steels

Publications (1)

Publication Number Publication Date
DE693074C true DE693074C (en) 1940-07-01

Family

ID=25981027

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1937H0157192 Expired DE693074C (en) 1934-06-29 1937-09-23 Process for pickling carburized areas or rolled-in metal or slag particles from bare, rust-proof chrome steels

Country Status (1)

Country Link
DE (1) DE693074C (en)

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