DE19736509A1 - Titanium-alloyed, isotropic, earing-free, cold rolled strip steel is produced - Google Patents

Titanium-alloyed, isotropic, earing-free, cold rolled strip steel is produced

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Publication number
DE19736509A1
DE19736509A1 DE1997136509 DE19736509A DE19736509A1 DE 19736509 A1 DE19736509 A1 DE 19736509A1 DE 1997136509 DE1997136509 DE 1997136509 DE 19736509 A DE19736509 A DE 19736509A DE 19736509 A1 DE19736509 A1 DE 19736509A1
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DE
Germany
Prior art keywords
steel
max
cold
rolling
strip
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.)
Ceased
Application number
DE1997136509
Other languages
German (de)
Inventor
Bernhard Dr Ing Engl
Klaus-Dieter Horn
Guenter Dipl Ing Stich
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
Fried Krupp AG Hoesch Krupp
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 Fried Krupp AG Hoesch Krupp filed Critical Fried Krupp AG Hoesch Krupp
Priority to DE1997136509 priority Critical patent/DE19736509A1/en
Publication of DE19736509A1 publication Critical patent/DE19736509A1/en
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

Cold rolled Ti-If strip is produced from a steel in which the C and N are completely combined with Ti by continuously rolling rough rolled strip or thin slab to hot strip at below the Ac3 temperature to 750 deg C and coiling at 750-650 deg C, followed by cold rolling and recrystallization annealing. Cold rolled Ti-If steel strip, with excellent formability and isotropic properties, is produced from a steel of composition (by wt.) \}0.02 % C, \}1.0 % Si, \}1.0 % Mn, \}0.1 % P, \}0.02 % S, \}0.1 % Al, \}0.01 % N, \}0.2 % Ti and balance Fe, in which the C and N contents are completely combined with Ti, by casting to slabs, continuously rolling the rough rolled strip or thin slab to hot strip in a finishing train at below the Ac3 temperature to 750 deg C, followed by coiling at 750-650 deg C, cold rolling with 40-80 % reduction and then recrystallization annealing.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines kaltgewalzten Ti-If- Bandstahles, wobei derartige Stähle und deren Zusammensetzung zum Stand der Technik gehören.The invention relates to a method for producing a cold-rolled Ti-If Steel strip, such steels and their composition to the state of the Technology belongs.

Kaltgewalztes Stahlband wird vielfach zur Herstellung von kaltumgeformten Erzeug­ nissen verwendet. Je nach Art des Umformverfahrens sind unterschiedliche Eigen­ schaften (Kennwerte) erforderlich.Cold rolled steel strip is widely used for the production of cold formed products nits used. Depending on the type of forming process, they are different properties (characteristic values) required.

Die steigenden Anforderungen bezüglich der Anwendungs- und Gebrauchseigen­ schaften bei niedrigen Herstellungskosten erfordern zunehmend noch bessere me­ chanische, insbesondere Umformeigenschaften. Eine gute Umformbarkeit ist ge­ kennzeichnet durch möglichst hohe, die Tiefziehbarkeit kennzeichnende r-Werte bei niedrigem Δr-Wert, hohe, die Streckziehbarkeit kennzeichnende n-Werte und hohe, die plane strain-Eigenschaften kennzeichnende Dehnungswerte.The increasing demands regarding the application and usage s at low production costs increasingly require better me Chanic, especially forming properties. Good formability is ge characterized by the highest possible r-values, which characterize the deep-drawability low Δr-value, high n-values characterizing the stretchability and high, elongation values characterizing the plane strain properties.

Es hat sich als vorteilhaft erwiesen, wenn die Umformeigenschaften in den verschie­ denen Richtungen, insbesondere in der Längs-, der Quer- und der Diagonalrichtung, möglichst gleich sind, d. h. weitgehend isotrop sind. Wenn diese Bedingung für den r-Wert zutrifft, bedeutet dies außerdem, daß der sog. Δr-Wert sehr klein ist, und nach dem Abpressen von rotationssymmetrischen Teilen weitgehende Freiheit von Zipfeln erreicht wird. Die Vorteile isotroper Eigenschaften drücken sich im wesentlichen in einer Gleichmäßigkeit des Stoffflusses und einer Reduzierung des Blechverschnitts aus. It has proven to be advantageous if the forming properties in the different which directions, in particular in the longitudinal, transverse and diagonal directions, are as equal as possible, d. H. are largely isotropic. If this condition for the If the r value applies, this also means that the so-called Δr value is very small, and after the pressing of rotationally symmetrical parts largely freedom from corners is achieved. The advantages of isotropic properties are essentially expressed a uniformity of the material flow and a reduction of the sheet waste out.  

Auch gibt es seit längerer Zeit erfolgreiche Bemühungen zur Erzielung isotroper Ei­ genschaften. Beispiele hierfür sind zipfelfrei verformte Stähle, abgestreckte Geträn­ kedose (KHS) oder "B-faktor" von Fa. Brockhaus "Der Spiegel", Nr. 19/1966, S. 125. Dieser Herstellungsweg erfordert aber einen sehr hohen Kaltwalzgrad oder sogar eine normalisierende Glühung zur Einstellung der Zipfelfreiheit.There have also been successful efforts to achieve isotropic egg for a long time properties. Examples of this are steels deformed without tails, drawn drinks kedose (KHS) or "B-factor" from Brockhaus "Der Spiegel", No. 19/1966, p. 125. However, this production route requires a very high degree of cold rolling or even a normalizing glow to set the tip clearance.

In jüngster Zeit sind Beispiele von höherfesten Feinblechstählen zur Erzielung von Zipfelfreiheit aus DE-PS 38 03 064 und DE 195 47 181 C1 bekannt geworden. Auch wurde bereits in früheren Veröffentlichungen die positive Wirkung des Legierungse­ lementes Niob (Satoh, S. u. a.: Kawasaki, Techn. Rep. 8 (1983) S. 1, Stahl und Ei­ sen 110 (1990), Heft 9, S. 65-68) sowie einer Niob-Titan-Legierung (EP 0 108 268) bei If-Stählen bezüglich einer Verringerung des Δr-Wertes gezeigt.In recent times, examples of high strength sheet steel have been used to achieve Tip freedom from DE-PS 38 03 064 and DE 195 47 181 C1 become known. Also The positive effect of the alloy was already mentioned in previous publications elemental niobium (Satoh, S. et al .: Kawasaki, Techn. Rep. 8 (1983) S. 1, steel and egg sen 110 (1990), No. 9, pp. 65-68) and a niobium-titanium alloy (EP 0 108 268) in the case of If steels with regard to a reduction in the Δr value.

Es fehlte jedoch an einem Konzept zur Kaltbanderzeugung eines nur mit Titan legier­ ten isotropen If-Stahles, welcher gegenüber einem mit Nb-legierten Stahl folgende Vorteile aufweist.
However, there was a lack of a concept for cold strip production of an isotropic If steel only alloyed with titanium, which has the following advantages over an alloy with Nb alloy steel.

  • - Niedrige Legierungskosten- Low alloy costs
  • - Niedrige Rekristallisationstemperatur- Low recrystallization temperature

Hier setzt die vorliegende Erfindung mit den im Anspruch 1 angegebenen Merkma­ len ein. Nach der vorliegenden Erfindung wird eine niedrige Walztemperatur unter­ halb Ar3 mit einem bestimmten Haspeltemperaturbereich kombiniert. Überraschend ergaben sich hierdurch Eigenschaften und Merkmale, wie sie bislang für Ti-If-Stahl unbekannt waren.Here, the present invention uses the features specified in claim 1 len. According to the present invention, a low rolling temperature below half A r3 is combined with a certain reel temperature range. Surprisingly, this resulted in properties and features that were previously unknown for Ti-If steel.

Das erfindungsgemäße Verfahren läßt die Herstellung isotroper Bandstähle nicht nur nach dem Hauben-, sondern auch nach dem Durchlaufverfahren zu sowie die Vered­ lung im Schmelztauchverfahren. The process according to the invention not only allows the production of isotropic steel strips after the hood, but also according to the continuous process as well as the Vered development in the hot-dip process.  

Einige Beispiele sollen das Ergebnis des erfindungsgemäßen Verfahrens verdeutli­ chen.Some examples are intended to illustrate the result of the method according to the invention chen.

In der Tabelle 1 ist die chemische Zusammensetzung des Stahles aufgeführt.Table 1 shows the chemical composition of the steel.

Tabelle 2 zeigt die Fertigungsbedingungen der Stahlbänder. Sie weisen die erfin­ dungsgemäße Eigenschaftskombination niedriger Walztemperatur in Kombination mit einem bestimmten Haspeltemperaturbereich aus.Table 2 shows the manufacturing conditions of the steel strips. You show the inventions combination of properties according to the invention low rolling temperature in combination with a certain reel temperature range.

In der Tabelle 3 sind die mechanischen Gütewerte und die Korngröße der Stähle von 70% kaltgewalztem Band aufgeführt.Table 3 shows the mechanical quality values and the grain size of the steels of 70% cold rolled strip.

In der Fig. 1 ist die Zipfelhöhe über dem Kaltwalzgrad für die durchlaufgeglühten Stähle und in Fig. 2 die für die haubengeglühten Stähle grafisch aufgetragen. Die Aufzeichnungen zeigen, daß sowohl bei den durchlaufgeglühten als auch bei den haubengeglühten Stählen bei Kaltwalzgraden zwischen rd. 40 und 80% zipfelarme Kaltbänder erzeugt wurden. Dabei war bei dem für die Kaltbandfertigung üblichen Kaltwalzgrad von rd. 70% die Zipfelhöhe aller Beispiele zipfelfrei.In Fig. 1 the tip height is plotted against the degree of cold rolling for the continuously annealed steels and in Fig. 2 that for the annealed steels. The records show that in the case of the continuous annealed as well as the annealed annealed steels at cold rolling grades between approx. 40 and 80% low-strip cold strips were produced. The usual degree of cold rolling of approx. 70% the tip height of all examples

Zudem ist den Fig. 1 und 2 zu entnehmen, daß eine abweichend von der Erfindung zu hohe (Nr. 1) oder zu niedrige (Nr. 5 u. 6) Haspeltemperatur eine hohe Zipfligkeit bewirkt. Dies unterstreicht das Erfordernis der erfindungsgemäßen Kombination von Walz- und Haspeltemperatur.It can also be seen from FIGS. 1 and 2 that a reel temperature which is too high (No. 1) or too low (No. 5 and 6), in deviation from the invention, results in a high degree of trickle. This underlines the requirement of the combination of rolling and coiling temperature according to the invention.

Claims (1)

Verfahren zur Herstellung eines kaltgewalzten Ti-If-Bandstahles mit hervorragender Umformbarkeit bei isotropen Eigenschaften aus Stahl mit folgender Zusammenset­ zung in Gewichtsprozenten:
max.: 0,02% C max.: 0,02% S max.: 1,0% Si max.: 0,1% Al max.: 1,0% Mn max.: 0,01% N max.: 0,1% P max.: 0,2% Ti
Rest Eisen, durch Warmwalzen, Kaltwalzen, und rekristallisierendes Glühen, wobei der Gehalt an C und N vollständig an Ti abgebunden wird, und wobei der Stahl zu Brammen abgegossen wird, die dann als vorgewalztes Stahlband oder als Dünn­ bramme in einer Fertigstaffel kontinuierlich zu Warmband ausgewalzt werden, wobei die Walztemperatur in der Fertigstaffel unter Ar3 bis 750°C und die Haspeltempera­ tur zwischen 750 bis 650°C liegt und der Stahl nach dem Warmwalzen mit einem Abwalzgrad von 40 bis 80% kalt ausgewalzt und dann rekristallisierend geglüht wird.Process for producing a cold-rolled Ti-If steel strip with excellent formability and isotropic properties from steel with the following composition in percent by weight:
max .: 0.02% C max .: 0.02% S max .: 1.0% Si max .: 0.1% Al max .: 1.0% Mn max .: 0.01% N max .: 0.1% P max .: 0.2% Ti
Remainder iron, by hot rolling, cold rolling, and recrystallizing annealing, in which the content of C and N is completely set in Ti, and in which the steel is poured into slabs, which are then rolled out as hot rolled steel strip or as a thin slab in a finishing series be, the rolling temperature in the finished batch below A r3 to 750 ° C and the reel temperature between 750 to 650 ° C and the steel is cold rolled after hot rolling with a rolling degree of 40 to 80% and then annealed to recrystallize.
DE1997136509 1997-08-22 1997-08-22 Titanium-alloyed, isotropic, earing-free, cold rolled strip steel is produced Ceased DE19736509A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1997136509 DE19736509A1 (en) 1997-08-22 1997-08-22 Titanium-alloyed, isotropic, earing-free, cold rolled strip steel is produced

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DE1997136509 DE19736509A1 (en) 1997-08-22 1997-08-22 Titanium-alloyed, isotropic, earing-free, cold rolled strip steel is produced

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DE19736509A1 true DE19736509A1 (en) 1999-04-22

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108268A1 (en) * 1982-10-08 1984-05-16 Nippon Steel Corporation Method for the production of cold rolled steel sheet having super deep drawability
DE3803064C2 (en) * 1988-01-29 1995-04-20 Preussag Stahl Ag Cold rolled sheet or strip and process for its manufacture
DE19547181C1 (en) * 1995-12-16 1996-10-10 Krupp Ag Hoesch Krupp Mfg. cold-rolled, high strength steel strip with good shapability

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108268A1 (en) * 1982-10-08 1984-05-16 Nippon Steel Corporation Method for the production of cold rolled steel sheet having super deep drawability
DE3803064C2 (en) * 1988-01-29 1995-04-20 Preussag Stahl Ag Cold rolled sheet or strip and process for its manufacture
DE19547181C1 (en) * 1995-12-16 1996-10-10 Krupp Ag Hoesch Krupp Mfg. cold-rolled, high strength steel strip with good shapability

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Brockhaus, Jaques G.: Zipfeln Sie noch ? Wir nichtmehr. Denn wir haben den B-Faktor. In: Der Spiegel1966, H.19, S.125 *
Hulka, Klaus, Heisterkamp, Friedrich: Stand der Entwicklung und Anwendung von IF-Stählen. In: Stahl u. Eisen, 1990, H.9, S.65-68 / S.65 u.66 *
Satoh, Susumu u.a.: Development of Non-Aging Cold Rolled Steel Sheets with Deep Drawability by a Continuous Annealing Process. In: Kawasaki Steel Technical Report, September 1983, No.8, S.1-10 / S.1,2 *

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OP8 Request for examination as to paragraph 44 patent law
8127 New person/name/address of the applicant

Owner name: THYSSEN KRUPP STAHL AG, 40211 DUESSELDORF, DE

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