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DE747124C - Process for producing steels containing chromium - Google Patents

Process for producing steels containing chromium

Info

Publication number
DE747124C
DE747124C DEN43507D DEN0043507D DE747124C DE 747124 C DE747124 C DE 747124C DE N43507 D DEN43507 D DE N43507D DE N0043507 D DEN0043507 D DE N0043507D DE 747124 C DE747124 C DE 747124C
Authority
DE
Germany
Prior art keywords
chromium
slag
acidic
containing chromium
content
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
DEN43507D
Other languages
German (de)
Inventor
Johannes Haag
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.)
NEUNKIRCHER EISENWERK A G VORM
Original Assignee
NEUNKIRCHER EISENWERK A G VORM
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 NEUNKIRCHER EISENWERK A G VORM filed Critical NEUNKIRCHER EISENWERK A G VORM
Priority to DEN43507D priority Critical patent/DE747124C/en
Application granted granted Critical
Publication of DE747124C publication Critical patent/DE747124C/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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/005—Manufacture of stainless steel

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (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 zum Herstellen chromhaltiger Stähle Zur Herstellung chromhaltiger Stähle ist es bekannt, beim Frischen mit saurem Ofenfutter und saurer Schlacke zu arbeiten. Zu diesem Zweck oxydierte man das vorhandene Chrom zunächst vollkommen und führte es dann in die Schlacke über, um dann in einem weiteren Arbeitsgang die Schlacke in dem gleichen oder einem anderen Ofen zusammen mit einem starken Reduktionsmittel, z. B. hochprozentigem Ferrosilicium, zu behandeln. Durch diese Behandlung wurde das Chromoxyd wieder reduziert, und das gebildete Chrom wurde dem Bade zulegiert.Process for the production of chromium-containing steels For the production of chromium-containing steels Steels are known to be refined with acidic furnace feed and acidic slag work. For this purpose, the existing chromium was first completely oxidized and then passed it over into the slag, in order to then use the Slag in the same or a different furnace together with a strong reducing agent, z. B. high percentage ferrosilicon to treat. Through this treatment it was the chromium oxide was reduced again, and the chromium formed was added to the bath.

Ein derartiges Verfahren ist aber sehr umständlich und auch unwirtschaftlich, so daß es keinen Eingang in die Praxis gefunden hat.Such a process is very cumbersome and also uneconomical, so that it has not found its way into practice.

Weiterhin sind Verfahren zur Herstellung, von chromlegierten Stählen aller Art mittels des Thomasverfahrens bekanntgeworden, bei denen ein chromhaltiges Roheisen verwendet wird, zu dessen Herstellung chromhaltige Rohstoffe, vornehmlich chronihaltige Erze, dienen. Dieses chromhaltige Roheisen -wird in der Thomasbirne nicht bis zur normalen Entphosphorung verblasen, sondern der Blasvorgang wird bereits bei einem Phosphorgehalt von etwa o, i °/" unterbrochen. Durch diese Maßnahme soll eine zu starke Verschlackund des Chroms verhütet werden, wobei die Schutzwirkung des Phosphors ausgenutzt wird.Furthermore, there are processes for the production of chromium-alloyed steels became known of all kinds by means of the Thomas process, in which a chromium-containing Pig iron is used, for the production of which raw materials containing chromium, primarily ores containing chronium. This pig iron containing chromium is found in the Thomas pear do not blow until normal dephosphorization, but the blowing process is already started interrupted at a phosphorus content of about o, i ° / ". This measure should an excessive slag and the chrome can be prevented, with the protective effect of phosphorus is exploited.

Auch dieses Verfahren hat sich nicht durchsetzen können, weil in den meisten Fällen ein Phosphorgehalt von o,i "/" unerwünscht ist.This procedure was also not able to prevail because in the In most cases a phosphorus content of o, i "/" is undesirable.

Die Erfindung besteht demgegenüber darin, Roheisen mit einem Chromgehalt von mindestens o,io"J" im Wind- oder Herdfrischverfahren zu behandeln und dabei in an sich bekannter Weise mit saurem Ofenfutter und saurer Schlacke zu arbeiten, wobei jedoch °rfinlungsgemäß die Frischung des chromhaltigen Ofeneinsatzes nur so lange durchgeführt wird, daß der wesentliche Gehalt ati `'Brom unverschlackt im Bad verbleibt. Dabei wird die bekannte Erkenntnis ausgenutzt, daß (las beim sauren Verfahren im Stahl vorhandene Silicium eine Schutzwirkung au_.-übt in der Weise, daß erst eine Verbrennung des Siliciums stattfindet, bevor der Chromgehalt des Einsatzes zur `'erschlackung kommt.In contrast, the invention consists in pig iron with a chromium content of at least o, io "J" to be treated in the wind or stove-fresh process and at the same time in itself known way with acidic furnace feed and acidic slag to work, but according to the refinement of the chromium-containing furnace insert is carried out only so long that the essential content of ati `` bromine is not slagged remains in the bathroom. The well-known knowledge is used here that (read at the sour Process silicon present in steel has a protective effect in such a way that that a combustion of the silicon takes place before the chromium content of the insert comes to '' slagging.

Claims (1)

PATENTANSPRUCH: Verfahren zum Herstellen chromhal. tiger Stähle aus Roheisen, das aus der BI-schickung ein:n Chromgehalt von mindestens o,io°% aufweist, oder aus entsprechend chromhaltigem Schrott im Wind-oder Herdfrischverfa:hren, bei dem mit saurem Ofenfutter und saurer Schlacke ,(lyearl)eitet wird, dadurch gekennzeichnet, ,laJ) die Frischttng des chromhaltigen Ofeneinsatzes nur so lange durchgeführt wird, daß der wesentliche Gehalt an Chrom ttnverschlackt im Bade verbleibt. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik sind Erteilungsverfahren folgende Druckschriften in Betracht gezogen worden: österreichische Patentschrift. N r. 139 o89; USA.-Patentschriften .. . - 1-179997, 1 76871o.PATENT CLAIM: Process for producing chromhal. tiger steels Pig iron, which from the BI-shipment in: n has a chromium content of at least o, io%, or from scrap containing chromium in the wind or stove freshening process which is prepared with acidic furnace fodder and acidic slag, (lyearl), characterized in that , laJ) the freshening of the chromium-containing furnace insert is only carried out as long as that the essential content of chromium remains in the bath in the form of slag. For demarcation For the subject of the application from the state of the art, the granting procedures are as follows Publications considered: Austrian patent specification. No. 139 o89; U.S. Patents ... - 1-179997, 1 76871o.
DEN43507D 1939-08-12 1939-08-12 Process for producing steels containing chromium Expired DE747124C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEN43507D DE747124C (en) 1939-08-12 1939-08-12 Process for producing steels containing chromium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN43507D DE747124C (en) 1939-08-12 1939-08-12 Process for producing steels containing chromium

Publications (1)

Publication Number Publication Date
DE747124C true DE747124C (en) 1944-09-11

Family

ID=7348730

Family Applications (1)

Application Number Title Priority Date Filing Date
DEN43507D Expired DE747124C (en) 1939-08-12 1939-08-12 Process for producing steels containing chromium

Country Status (1)

Country Link
DE (1) DE747124C (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1479997A (en) * 1920-12-29 1924-01-08 Mccaffery Richard Stanislaus Bessemerizing iron
US1768710A (en) * 1927-03-11 1930-07-01 Bethlehem Steel Corp Utilization of converter slags for the manufacture of alloy steel
AT139089B (en) * 1931-01-02 1934-10-25 Ver Stahlwerke Ag Process for the production of chromium-alloyed steels of all kinds by means of the Thomas process.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1479997A (en) * 1920-12-29 1924-01-08 Mccaffery Richard Stanislaus Bessemerizing iron
US1768710A (en) * 1927-03-11 1930-07-01 Bethlehem Steel Corp Utilization of converter slags for the manufacture of alloy steel
AT139089B (en) * 1931-01-02 1934-10-25 Ver Stahlwerke Ag Process for the production of chromium-alloyed steels of all kinds by means of the Thomas process.

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