EP0216044B2 - Process for manufacturing non-aging steel strip having a high cold formability - Google Patents

Process for manufacturing non-aging steel strip having a high cold formability Download PDF

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Publication number
EP0216044B2
EP0216044B2 EP86109521A EP86109521A EP0216044B2 EP 0216044 B2 EP0216044 B2 EP 0216044B2 EP 86109521 A EP86109521 A EP 86109521A EP 86109521 A EP86109521 A EP 86109521A EP 0216044 B2 EP0216044 B2 EP 0216044B2
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EP
European Patent Office
Prior art keywords
max
steel
rolling
cold
maximum
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Expired - Lifetime
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EP86109521A
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German (de)
French (fr)
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EP0216044A2 (en
EP0216044B1 (en
EP0216044A3 (en
Inventor
Ernst Jürgen dr. Drewes
Bernhard Dr. Engl
Klaus Dieter Horn
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Krupp Hoesch Stahl AG
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Krupp Hoesch Stahl AG
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Application filed by Krupp Hoesch Stahl AG filed Critical Krupp Hoesch Stahl AG
Priority to AT86109521T priority Critical patent/ATE104362T1/en
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • C21D8/041—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 involving a particular fabrication or treatment of ingot or slab

Definitions

  • the invention relates to a method for producing an aging-resistant steel strip with high cold formability.
  • Cold rolled steel strip is widely used for the production of cold formed products.
  • different properties characteristics (characteristic values) are required, whereby in all cases of high deformation, low yield strengths and high elongation at break values are advantageous.
  • a high strengthening exponent n m is also sought for stretch-drawing processes and for deep-drawing stress, especially when producing complicated parts, for. B. of automobile bodies, the value of the vertical anisotropy r m should also be as high as possible.
  • EP-A-108 268 describes a process for the production of cold-rolled strip with the highest deep-drawability, which contains the use of low slab preheating temperatures below 1170 ° C. as a measure, but the subject of this document is IF steel with the lowest C - held by max. 0.007% C and the need to add Ti and niobium is limited.
  • the favorable effect of the low preheating temperatures is linked to the presence of (Ti.Nb) C.
  • DE-OS 31 38 302 describes a process for producing cold-rolled high-strength steel strip from a steel which has a high phosphorus content of 0.05 to 0.10% by weight. It is proposed that the steel slabs be heated to a maximum of 1,200 ° C or in the range 1,200 to 1,000 ° C.
  • the desired tensile limits are, as Table 2 shows, over 20 kp / mm, which means that according to this state of the art the production of age-resistant steel strips with maximum cold formability has not yet been satisfactorily resolved, and this known method in particular also fulfills the wishes for exclusively Use of continuous production processes with increased economy and improved properties of the finished products, differentiated according to the respective deformation process, material stresses and characteristics not met.
  • the finish hot rolling is preferably above a 3.
  • EP-A-101 740 discloses the production of age-resistant steel which is easy to deform and which is vacuum-treated, including 0.001% C, 0.02% Si, 0.15% Mn, 0.1% P, 0.007% S, 0.001% N and 0.056% Al, remainder iron in addition to contamination by hot rolling in eleven passes, starting at a temperature of 1000 ° C. and ending at 670 ° C., cold rolling, recrystallizing annealing and skin passaging, an elastic limit of approx. 137N / mm 2 being reached.
  • the object of the invention is therefore to create a method for producing an aging-resistant cold-rolled steel strip which has the highest cold-formability properties, without the need for vacuum treatment or the addition of alloying elements such as titanium, niobium or vanadium.

Abstract

The steel strip is produced by hot strip-rolling, cold-rolling, recrystallising annealing and subsequent dressing. To be able exclusively to use continuous production processes having improved economics and at the same time to obtain improved properties of the finished products, differentiated according to the particular deformation processes, material loadings and parameters, it is proposed according to the invention to cast steels (data in percent by mass) having max. 0.06% C max. 0.10% Si max. 0.40% Mn max. 0.03% P max. 0.03% S max. 0.01% N at least one of the five elements from the following group 0- 0.10% Al 0- 0.006% B 0- 0.20% Ti 0 -0.20% Nb 0 -0.20% V impurities due to the smelting, the remainder being iron, to give ingots, to heat these before hot-rolling to a temperature of at most 1200 DEG C, to roll them out, reel them and then to recrystallisation- anneal them to yield strengths of not more than 200 N/mm<2>.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines alterungsbeständigen Bandstahles mit hoher Kaltumformbarkeit.The invention relates to a method for producing an aging-resistant steel strip with high cold formability.

Kaltgewalztes Stahlband wird vielfach zur Herstellung von kaltumgeformten Erzeugnissen verwendet. Je nach Art des Umformverfahrens sind unterschiedliche Eigenschaften (Kennwerte) erforderlich, wobei in allen Fällen hoher Verformung niedrige Dehngrenzen und hohe Bruchdehnungswerte vorteilhaft sind. Außerdem wird für Streckziehvorgänge zusätzlich ein hoher Verfestigungsexponent nm angestrebt und für Tiefziehbeanspruchung, speziell bei Herstellung komplizierter Teile z. B. von Automobilkarosserien, sollte zusätzlich der Wert der senkrechten Anisotropie rm möglichst hoch sein.Cold rolled steel strip is widely used for the production of cold formed products. Depending on the type of forming process, different properties (characteristic values) are required, whereby in all cases of high deformation, low yield strengths and high elongation at break values are advantageous. In addition, a high strengthening exponent n m is also sought for stretch-drawing processes and for deep-drawing stress, especially when producing complicated parts, for. B. of automobile bodies, the value of the vertical anisotropy r m should also be as high as possible.

In der EP-A-108 268 wird ein Verfahren zur Herstellung von kaltgewalztem Band mit höchster Tiefziehbarkeit beschrieben, welches zwar als eine Maßnahme die Anwendung niedriger Brammenvorwärmtemperaturen unter 1 170 °C enthält, jedoch ist der Gegenstand dieser Druckschrift auf IF-Stahl mit geringsten C-Gehalten von max. 0,007 % C und die Erfordernis einer Zugabe von Ti und Niob beschränkt. Die günstige Wirkung der niedrigen Vorwärmtemperaturen ist an das Vorhandensein von (Ti.Nb)C gebunden.EP-A-108 268 describes a process for the production of cold-rolled strip with the highest deep-drawability, which contains the use of low slab preheating temperatures below 1170 ° C. as a measure, but the subject of this document is IF steel with the lowest C - held by max. 0.007% C and the need to add Ti and niobium is limited. The favorable effect of the low preheating temperatures is linked to the presence of (Ti.Nb) C.

Die DE-OS 31 38 302 beschreibt ein Verfahren zur Herstellung von kaltgewalztem Bandstahl hoher Festigkeit aus einem Stahl, der einen hohen Phosphorgehalt von 0,05 bis 0,10 Gew.-% hat. Dabei wird eine Erwärmung der Stahlbrammen auf höchstens 1.200 °C bzw. in den Bereich 1.200 bis 1.000 °C vorgeschlagen. Die angestrebten Dehngrenzen liegen, wie Tab. 2 belegt, über 20 kp/mm, was bedeutet, daß nach diesem Stand der Technik die Herstellung alterungsbeständiger Stahlbänder mit höchster Kaltumformbarkeit jedoch noch nicht befriedigend gelöst ist, wobei auch dieses bekannte Verfahren insbesondere die Wünsche nach ausschließlicher Verwendung kontinuierlicher Produktionsverfahren mit erhöhter Wirtschaftlichkeit und nach verbesserten Eigenschaften der Fertigprodukte, differenziert nach den jeweiligen Verformungsverfahren, Werkstoffbeanspruchungen und -kennwerten nicht erfüllt. Im übrigen ist das Fertigwarmwalzen oberhalb A3 bevorzugt.DE-OS 31 38 302 describes a process for producing cold-rolled high-strength steel strip from a steel which has a high phosphorus content of 0.05 to 0.10% by weight. It is proposed that the steel slabs be heated to a maximum of 1,200 ° C or in the range 1,200 to 1,000 ° C. The desired tensile limits are, as Table 2 shows, over 20 kp / mm, which means that according to this state of the art the production of age-resistant steel strips with maximum cold formability has not yet been satisfactorily resolved, and this known method in particular also fulfills the wishes for exclusively Use of continuous production processes with increased economy and improved properties of the finished products, differentiated according to the respective deformation process, material stresses and characteristics not met. Incidentally, the finish hot rolling is preferably above a 3.

EP-A-101 740 offenbart die Herstellung von gut Kaltverformbarem alterungsbeständigen Stahe, der vakuumbehandelt ist, unteranderem mit 0,001 % C, 0,02 % Si, 0,15 % Mn, 0,1% P, 0,007 % S, 0,001 % N und 0,056 % Al, Rest Eisen neben Verunreinigungen durch Warmwalzen in elf Walzstichen ausgehend bei einer Temperatur von 1000°C und endend bei 670°C, Kaltwalzen, rekristallisierendes Glühen und Dressieren, wobei eine Dehngrenze von ca. 137N/mm2 erreicht wird.EP-A-101 740 discloses the production of age-resistant steel which is easy to deform and which is vacuum-treated, including 0.001% C, 0.02% Si, 0.15% Mn, 0.1% P, 0.007% S, 0.001% N and 0.056% Al, remainder iron in addition to contamination by hot rolling in eleven passes, starting at a temperature of 1000 ° C. and ending at 670 ° C., cold rolling, recrystallizing annealing and skin passaging, an elastic limit of approx. 137N / mm 2 being reached.

Von daher liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zum Herstellen eines alterungsbeständigen kaltgewalzten Stahlbandes, das höchste Kaltumformbarkeitseigenschaften aufweist, zu schaffen, ohne daß eine Vakuumbehandlung oder der Zusatz von Legierungselementen wie Titan, Niob oder Vanadium notwendig ist.The object of the invention is therefore to create a method for producing an aging-resistant cold-rolled steel strip which has the highest cold-formability properties, without the need for vacuum treatment or the addition of alloying elements such as titanium, niobium or vanadium.

Diese Aufgabe wird durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Maßnahmen gelöst.This object is achieved by the measures specified in the characterizing part of claim 1.

Zweckmäßige und vorzugsweise Verfahrensschritte sind in den Unteransprüchen 2 bis 7 angegeben. Die verbesserte Kaltumformbarkeit wird anhand des im folgenden erörterten Beispiels belegt.Appropriate and preferably method steps are specified in subclaims 2 to 7. The improved cold formability is demonstrated using the example discussed below.

Die Auswirkungen der in den Ansprüchen festgelegten Maßnahmen sind anhand von in der Zeichnung dargestellten Balkendiagrammen erläutert.The effects of the measures specified in the claims are explained using the bar graphs shown in the drawing.

Der Stahl für das Beispiel hat folgende Zusammensetzung:

  • C 0,02 %
  • Si 0,01 %
  • Mn 0,2 %
  • P 0,008 %
  • S 0,012 %
  • Al 0,04 %
  • N 0,003 %
Dieser Al-beruhigte Stahl weist einen Legierungsgehalt auf. Er wurde im Beispiel als Bramme nach dem Stand der Technik bei 1.270 °C vorgewärmt und in herkömmlicher Weise warmgewalzt mit einer Endtemperatur von 920 °C und kalt ausgewalzt sowie rekristallisierend geglüht und dressiert. Das Beispiel zeigt die Auswirkungen abgesenkter Vorwärm- und Walzendtemperaturen. In der linken Hälfte der Felder sind die Werkstoffeigenschaften für die hohen Vorwärm- und Walzendtemperaturen aufgetragen. Die mechanischen Eigenschaften für die Variante mit hoher Vorwärm- und Walzendtemperatur im Beispiel, i. e. Dehngrenze und Bruchdehnung genügen nicht mehr für sehr anspruchsvolle Verwendungszwecke. In der rechten Hälfte der entsprechenden Felder sind die gleichen Kennwerte bei erfindungsgemäßer Herstellung des Kaltbandes dargestellt. Die Bramme wurde zunächst auf eine Temperatur von 1.100 °C vorgewärmt und dann das Band zwischen Vor- und Fertigstaffel gekühlt, so daß das Band aus dem letzten Fertiggerüst mit 800 °C austrat. Die prozentuale Dickenabnahme des Bandes nach Durchlaufen der Umwandlungstemperatur erreichte noch 40 %. Aus diesem Warmband hergestelltes Kaltband erreichte trotz des geringen Legierungsaufwandes so günstige Werte von Dehngrenze, Bruchdehnung und Verfestigungsexponent, daß diese Erzeugnisse auch für anspruchsvollste Verwendungszwecke unter Einsatz von Streckziehen und Abkanten eingesetzt werden können. Allerdings ist der Kennwert der senkrechten Anisotropie rm mit 1,3 nicht ausreichend für die Herstellung komplizierter Tiefziehteile.The steel for the example has the following composition:
  • C 0.02%
  • Si 0.01%
  • Mn 0.2%
  • P 0.008%
  • S 0.012%
  • Al 0.04%
  • N 0.003%
This Al-calmed steel has an alloy content. In the example, it was preheated as a slab according to the prior art at 1,270 ° C. and hot-rolled in a conventional manner with a final temperature of 920 ° C. and cold-rolled and annealed and dressed in a recrystallizing manner. The example shows the effects of reduced preheating and roll temperatures. The material properties for the high preheating and final roll temperatures are plotted in the left half of the fields. The mechanical properties for the variant with high preheating and roll end temperature in the example, ie proof strength and elongation at break, are no longer sufficient for very demanding applications. The same characteristic values are shown in the right half of the corresponding fields when the cold strip is produced according to the invention. The slab was first preheated to a temperature of 1,100 ° C and then the strip was cooled between the preliminary and finishing stages, so that the strip emerged from the last finishing stand at 800 ° C. The percentage decrease in thickness of the strip after passing through the transition temperature still reached 40%. Cold strip produced from this hot strip, despite the low alloying effort, achieved such favorable values of yield strength, elongation at break and strengthening exponent that these products can also be used for the most demanding purposes using stretch drawing and folding. However, the characteristic value of the vertical anisotropy r m with 1.3 is not sufficient for the production of complicated deep-drawn parts.

Wie aus den vorstehenden Ausführungen und dem Beispiel ersichtlich, führt die erfindungsgemäße Kombination der genannten Verfahrensschritte dahin, daß mit verbesserter Produktivität kaltgewalzte Stahlbänder zuverlässiger und mit für bestimmte Verwendungszwecke gezielt verbesserter Kaltumformbarkeit hergestellt werden können.As can be seen from the above explanations and the example, the combination of the process steps mentioned leads to the invention to the effect that cold-rolled steel strips can be produced more reliably with improved productivity and with improved cold formability for specific purposes.

Gegenüber dem erhöhten Energiebedarf beim Warmwalzen überwiegen die Vorteile des erfindungsgemäßen Verfahrens. Es seien hierfür nur einige Beispiele genannt:

  • kürzere Durchsatzzeiten und damit erhöhte Leistung der Ofenanlage für die Brammenvorwärmung,
  • geringere Verzunderung, also höheres Gewichtsausbringen,
  • gezielte Kombination der Werkstoffkennwerte für unterschiedliche Kaltumformverfahren,
  • gesteigerter Einsatz von leistungssteigernden kontinuierlichen Verfahrensschritten sämtlicher Arbeitsgänge.
The advantages of the method according to the invention outweigh the increased energy requirements during hot rolling. Here are just a few examples:
  • Shorter throughput times and thus increased performance of the furnace system for slab preheating,
  • less scaling, so more weight,
  • targeted combination of material properties for different cold forming processes,
  • increased use of performance-enhancing continuous process steps in all work processes.

Claims (7)

  1. Process for manufacturing non-aging steel strip having a high cold formability by hot strip rolling, cold rolling, annealing in a recrystallising manner and subsequent finishing, wherein steel (details in percentage of mass) having
       0,02 to 0.06% C
       max. 0.10% Si
       max. 0.40% Mn
       max. 0.03% P
       max. 0.03% S
       max. 0.01% N
    at least one of the elements of the following group
       0 0.10% Al
       0 - 0.006% B
       impurities caused by smelting
       Residual iron
    is cast into ingots, heated prior to hot rolling to temperatures of 1000 to maximum 1,200°C and finished hot rolled at a temperature below A3, wherein the reduction in thickness below A3 amounts to at least 35% of the thickness when passing through A3, drawn, cold rolled and subsequently annealed in a recrystallising manner to a yield strength of a maximum 200 N/mm2.
  2. Process as claimed in claim 1 characterised in that the steel comprises a max. 0.05% Si.
  3. Process as claimed in claims 1 and 2, characterised in that the steel comprises a maximum of 0.006%.
  4. Process as claimed in one of the preceding claims, characterised in that the steel is heated prior to hot rolling to a temperature of a maximum 1,150°C, especially to a maximum 1,100°C, however above 1,000°C.
  5. Process as claimed in one or several of the preceding claims, characterised in that after the cold rolling the steel is annealed in a recrystallising manner in a continuous furnace through which the stripe is drawn.
  6. Process as claimed in one or several of the preceding claims, characterised in that the steel is subjected prior to the finishing to a short over-aging treatment comprising annealing in the range between approx. 250 and 450 °C.
  7. Process as claimed in one or several of the preceding claims, characterised in that the cold rolled steel is annealed continuously and subsequently, especially directly following, is provided in the melt with a metallic coating.
EP86109521A 1985-08-10 1986-07-11 Process for manufacturing non-aging steel strip having a high cold formability Expired - Lifetime EP0216044B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86109521T ATE104362T1 (en) 1985-08-10 1986-07-11 PROCESS FOR PRODUCTION OF AN AGING-RESISTANT STEEL STRIP WITH HIGH COLD FORMABILITY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853528782 DE3528782A1 (en) 1985-08-10 1985-08-10 METHOD FOR PRODUCING AN AGING-RESISTANT STRIP STEEL WITH HIGH COLD FORMABILITY
DE3528782 1985-08-10

Publications (4)

Publication Number Publication Date
EP0216044A2 EP0216044A2 (en) 1987-04-01
EP0216044A3 EP0216044A3 (en) 1989-06-14
EP0216044B1 EP0216044B1 (en) 1994-04-13
EP0216044B2 true EP0216044B2 (en) 1997-09-03

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EP86109521A Expired - Lifetime EP0216044B2 (en) 1985-08-10 1986-07-11 Process for manufacturing non-aging steel strip having a high cold formability

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EP (1) EP0216044B2 (en)
AT (1) ATE104362T1 (en)
DE (2) DE3528782A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2810245B2 (en) * 1991-01-25 1998-10-15 日本鋼管株式会社 Cold rolled steel sheet excellent in press formability and phosphatability and method for producing the same
JP3422612B2 (en) * 1996-01-19 2003-06-30 Ｊｆｅスチール株式会社 Manufacturing method of ultra low carbon cold rolled steel sheet
DE19701443A1 (en) * 1997-01-17 1998-07-23 Thyssen Stahl Ag Cold rolled steel sheet or strip with good formability used for car parts production
DE19740148C1 (en) * 1997-09-12 1999-07-15 Thyssenkrupp Stahl Ag Process for the manufacture of dent-resistant enamelled components made of age-sensitive steel
DE19834361A1 (en) * 1998-07-30 2000-02-03 Schaeffler Waelzlager Ohg Precision deep-drawn case-hardened component, especially a roller bearing and motor component e.g. a needle bearing, sleeve or bush, is made from a cold rolled strip of steel with specified titanium, nitrogen and low aluminum contents
DE19840788C2 (en) * 1998-09-08 2000-10-05 Thyssenkrupp Stahl Ag Process for producing cold-rolled strips or sheets
DE19946889C1 (en) * 1999-09-30 2000-11-09 Thyssenkrupp Stahl Ag Aging resistant aluminum-killed steel strip, for manufacturing cold formed components e.g. bodywork parts, is produced by subjecting rolled strip to continuous annealing, hot coiling, cooling to room temperature and skin pass rolling
DE10020118B4 (en) 2000-04-22 2009-11-12 Schaeffler Kg Method for verifying sealability of selected exhaust valve of selected cylinder in internal combustion engine in motor vehicle, involves concluding sealability of valve based on measured values of lambda sensor in one of exhaust gas strands
CN107099648A (en) * 2017-06-27 2017-08-29 中国航空工业集团公司沈阳飞机设计研究所 The structure property homogenization heat treatment method of the steel of laser deposition molding A 100

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Publication number Priority date Publication date Assignee Title
NL7412582A (en) * 1974-09-24 1976-03-26 Armco Steel Corp PROCESS FOR THE MANUFACTURE OF COLD ROLLED AND BLAST STEEL SHEET.
JPS5849627B2 (en) * 1979-02-27 1983-11-05 川崎製鉄株式会社 Method for producing non-temporal cold-rolled steel sheet
JPS56166330A (en) * 1980-04-25 1981-12-21 Nippon Steel Corp Manufacture of cold rolled steel plate for deep drawing by continuous annealing
JPS5857492B2 (en) * 1980-09-25 1983-12-20 新日本製鐵株式会社 Manufacturing method of high-strength cold-rolled steel sheet for automobiles
DE3170723D1 (en) * 1981-08-25 1985-07-04 Nippon Steel Corp Dual-purpose plant for producing cold rolled steel sheet and hot-dip galvanized steel sheet
JPS6045689B2 (en) * 1982-02-19 1985-10-11 川崎製鉄株式会社 Method for manufacturing cold rolled steel sheet with excellent press formability
US4504326A (en) * 1982-10-08 1985-03-12 Nippon Steel Corporation Method for the production of cold rolled steel sheet having super deep drawability
US4473411A (en) * 1983-07-20 1984-09-25 Armco Inc. Process of making aluminum killed low manganese deep drawing steel

Also Published As

Publication number Publication date
DE3528782A1 (en) 1987-02-19
EP0216044A2 (en) 1987-04-01
DE3689781D1 (en) 1994-05-19
DE3528782C2 (en) 1990-06-13
EP0216044B1 (en) 1994-04-13
EP0216044A3 (en) 1989-06-14
ATE104362T1 (en) 1994-04-15

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