DE10128544A1 - High-strength, cold-formable steel strip or sheet, process for its production and use of such a strip or sheet - Google Patents
High-strength, cold-formable steel strip or sheet, process for its production and use of such a strip or sheetInfo
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- DE10128544A1 DE10128544A1 DE10128544A DE10128544A DE10128544A1 DE 10128544 A1 DE10128544 A1 DE 10128544A1 DE 10128544 A DE10128544 A DE 10128544A DE 10128544 A DE10128544 A DE 10128544A DE 10128544 A1 DE10128544 A1 DE 10128544A1
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- steel strip
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Die Erfindung betrifft ein Stahlband oder -blech mit guter Kaltumformbarkeit und höherer Festigkeit aus einem Fe-Mn-Al-Si-Leichtstahl mit Kohlenstoff. The invention relates to a steel strip or sheet good cold formability and higher strength from one Fe-Mn-Al-Si light steel with carbon.
Ein für die Herstellung von Karosseriebauteilen und den Tieftemperatureinsatz verwendeter Leichtstahl ist aus der DE 197 27 759 C2 bekannt. Er enthält neben Fe 10% bis 30% Mn, 1% bis 8% Al und 1 bis 6% Si, wobei die Summe der Gehalte an Al und Si 12% nicht überschreitet. In diesem bekannten Stahl ist Kohlenstoff allenfalls im Verunreinigungsbereich enthalten. One for the production of body parts and the Low-temperature use of light steel is from the DE 197 27 759 C2 known. In addition to Fe, it contains 10% to 30% Mn, 1% to 8% Al and 1 to 6% Si, the sum the content of Al and Si does not exceed 12%. In this known steel is carbon at best Contamination area included.
Beim aus der DE 199 00 199 A1 bekannten Leichtbaustahl ist dagegen Kohlenstoff als optionales Legierungselement vorgesehen. Der bekannte Leichtstahl weist > 7% bis 27% Mn, > 1% bis 10% Al, > 0,7% bis 4% Si, < 0,5% C, < 10% Cr, < 10% Ni und < 0,3% Cu auf. Des weiteren können in dem Stahl N, V, Nb, Ti, P enthalten sein, wobei die Summe dieser Elemente 2% nicht überschreiten darf. In the lightweight steel known from DE 199 00 199 A1 on the other hand, carbon is an optional alloying element intended. The well-known light steel has> 7% to 27% Mn,> 1% to 10% Al,> 0.7% to 4% Si, <0.5% C, < 10% Cr, <10% Ni and <0.3% Cu. Furthermore can be contained in the steel N, V, Nb, Ti, P, where the sum of these elements must not exceed 2%.
Auch der aus der EP 1 067 203 A1 bekannte Leichtstahl enthält Kohlenstoff, und zwar 0,001 bis 1,6%. Zudem weist dieser Stahl neben Fe 6-30% Mn, ≤ 6% Al, ≤ 2,5% Si, ≤ 10% Cr, ≤ 10% Ni und ≤ 5% Cu auf. Zusätzlich können V, Ti, Nb, B, Zr und Seltene Erden in dem Stahl enthalten sein, wobei die Summe ihrer Gehalte 3% nicht überschreitet. Ebenso kann der bekannte Stahl P, Sn, Sb, und As beinhalten, wobei die Summe der Gehalte dieser Elemente nicht größer als 0,2% sein soll. Also the light steel known from EP 1 067 203 A1 contains carbon, namely 0.001 to 1.6%. moreover in addition to Fe 6-30% Mn, ≤ 6% Al, ≤ 2.5% Si, ≤ 10% Cr, ≤ 10% Ni and ≤ 5% Cu. additionally can V, Ti, Nb, B, Zr and rare earths in the steel be included, the sum of their contents not 3% exceeds. The known steel P, Sn, Sb, and As contain, the sum of the contents of these Elements should not be larger than 0.2%.
Es hat sich gezeigt, daß sich derart zusammengesetzte Stähle trotz der Anwesenheit von Kohlenstoff nur unter Schwierigkeiten warm- und kaltwalzen lassen. So zeigen sich an den Bandkanten häufig Instabilitäten oder Risse, welche die großtechnische Herstellung von Bändern oder Blechen aus solchen Stählen in der Praxis schwierig machen. Des weiteren weisen diese Stähle ein sehr stark isotropes Verformungsverhalten auf, welches sich in einem hohen Δr-Wert äußert. Auch infolge der schlechten Verformbarkeit wird die Weiterverarbeitung der nach dem bekannten Verfahren erzeugten Stahlbleche erschwert. It has been shown that such a combination Despite the presence of carbon, steels only under Difficulty hot and cold rolling. So show there are often instabilities or cracks on the belt edges, which is the industrial production of tapes or Sheet metal made from such steels is difficult in practice do. Furthermore, these steels are very strong isotropic deformation behavior, which is reflected in a expresses high Δr value. Even as a result of the bad Deformability is the further processing of the after known methods made steel sheets difficult.
Die Aufgabe der Erfindung besteht darin, ausgehend von dem voranstehend erläuterten Stand der Technik ein aus einem Leichtstahl erzeugtes Stahlband oder -blech mit guter Verformbarkeit und guter Festigkeit zu schaffen, das sich auch im großtechnischen Maßstab einfach herstellen läßt. Darüber hinaus sollen ein Verfahren zur Herstellung und bevorzugte Verwendungen eines solchen Stahlbandes oder -blechs angegeben werden. The object of the invention is based on the above explained prior art a steel strip or sheet made of light steel to create good deformability and good strength, that is easy even on an industrial scale can be made. In addition, a method for Manufacture and preferred uses of such Steel strip or sheet can be specified.
Die Aufgabe wird zum einen durch ein Stahlband oder
-blech gelöst, das aus einem Leichtstahl hergestellt ist,
der folgende Zusammensetzung aufweist (in Gewichts -%):
C: ≤ 1,00%
Mn: 7,00-30,00%
Al: 1,00-10,00%
Si: > 2,50-8,00%
Al + Si: > 3,50-12,00%
B: > 0,00-< 0,01%
sowie wahlweise
Ni: < 8,00%
Cu: < 3,00%
N: < 0,60%
Nb: < 0,30%
Ti: < 0,30%
V: < 0,30%
P: < 0,01%
Rest Eisen und unvermeidbare Verunreinigungen. Den
Verunreinigungen werden dabei Schwefel und Sauerstoff
zugerechnet.
The task is solved on the one hand by a steel strip or sheet which is made of a light steel which has the following composition (in% by weight):
C: ≤ 1.00%
Mn: 7.00-30.00%
Al: 1.00-10.00%
Si:> 2.50-8.00%
Al + Si:> 3.50-12.00%
B:> 0.00- <0.01%
as well as optional
Ni: <8.00%
Cu: <3.00%
N: <0.60%
Nb: <0.30%
Ti: <0.30%
V: <0.30%
P: <0.01%
Balance iron and unavoidable impurities. Sulfur and oxygen are added to the impurities.
Überraschend hat sich herausgestellt, daß die gezielte Zugabe von Bor bei erfindungsgemäßen Stählen zu einer deutlichen Verbesserung der Eigenschaften und der Herstellbarkeit führt. So bewirkt der im zur Erzeugung erfindungsgemäßer Stahlbänder oder -bleche eingesetzten Stahl enthaltene Gehalt an Bor eine Verminderung der Streckgrenze, wodurch die Verformbarkeit deutlich verbessert wird. Die günstigen Einflüsse der Legierung auf die mechanischtechnologischen Eigenschaften erfindungsgemäßer Stahlbänder und -bleche kann dadurch noch unterstützt werden, daß der Kohlenstoffgehalt 0,10-1,00 Gew.-% beträgt, wenn also ein Mindestmaß von 0,10 Gew.-% an Kohlenstoff im erfindungsgemäßen Stahl nachweisbar ist. Surprisingly, it turned out that the targeted Adding boron to the steels according to the invention significant improvement in properties and Manufacturability leads. This is how it works Steel strips or sheets according to the invention used Steel contained a decrease in boron content Yield point, making the deformability clear is improved. The favorable influences of the alloy on the mechanical-technological properties Steel strips and sheets according to the invention can thereby still be supported that the carbon content 0.10-1.00 wt .-% is, if a minimum of 0.10% by weight of carbon in the steel according to the invention is detectable.
Dabei hat die Anwesenheit dieser Elemente eine besonders gute Kombination von mechanischen und technologischen Eigenschaften zur Folge. So weisen erfindungsgemäße Stahlbänder und -bleche einen gegenüber den aus dem Stand der Technik bekannten, zur hier in Rede stehenden Gattung gehörenden Bleche einen deutlich niedrigeren Δr-Wert auf. The presence of these elements is special good combination of mechanical and technological Properties. So point according to the invention Steel strips and sheets compared to those from the stand the technology known to the type in question here belonging sheets have a significantly lower Δr value.
Zusätzlich zeichnen sich erfindungsgemäß zusammengesetzte kaltgewalzte Stahlbänder und -bleche durch vergleichbar niedrige Streckgrenzen, verbesserte Streckziehfähigkeit bei erhöhten Verfestigungsexponenten (n-Wert), erhöhter Tiefziehfähigkeit (r-Wert) und niedriger planarer Anisotropie (Δr-Wert) sowie ein erhöhtes Produkt aus Streckgrenze und Dehnung aus. So liegt die Zugfestigkeit erfindungsgemäßer Stahlbänder und -bleche mindestens bei 680 MPa. Das Produkt aus Zugfestigkeit und Dehnung beträgt mindestens 41000 MPa. Die Streckgrenze erfindungsgemäßer Stahlbleche und -bänder überschreitet 520 MPa nicht. Im Ergebnis wird so ein besonders gut kaltverformbares Leichtstahlband oder -blech erhalten, das sich aufgrund seiner vergleichsweise hohen Festigkeit und geringen Dichte insbesondere für die Herstellung von Bauteilen für Automobilkarossen eignet. Ebenso macht das ausgezeichnete Verhältnis von Festigkeit und Gewicht ein erfindungsgemäß erzeugtes Stahblech für die Herstellung von Rädern für Fahrzeuge, insbesondere Kraftfahrzeuge, für die Herstellung von innenhochdruck- oder außenhochdruckverformten Bauteilen, für die Herstellung von hochfesten Motorteilen, wie Nockenwellen oder Kolbenstangen, für die Herstellung von für den Schutz gegen impulsförmig auftreffende Belastungen, wie Beschuß, bestimmten Bauelementen, wie Panzerblechen, sowie Schutzelemente geeignet, die zum Schutz von Personen insbesondere gegen Beschuß bestimmt sind. Insbesondere im Falle der letztgenannten Anwendung macht sich das vergleichsweise geringe Gewicht des erfindungsgemäßen Stahlblechs und die gleichzeitig hohe Festigkeit positiv bemerkbar. In addition, compositions according to the invention are distinguished cold-rolled steel strips and sheets by comparable low yield strengths, improved yield strength with increased hardening exponents (n-value), higher Deep drawing ability (r-value) and lower planar Anisotropy (Δr value) as well as an increased product Yield strength and elongation. This is the tensile strength Steel strips and sheets according to the invention at least at 680 MPa. The product of tensile strength and elongation is at least 41000 MPa. The yield point steel sheets and strips according to the invention exceeds 520 MPa not. The result is a particularly good one receive cold-formable light steel strip or sheet, that due to its comparatively high strength and low density especially for the production of Components suitable for automotive bodies. It does the same excellent strength-to-weight ratio Steel sheet produced according to the invention for the production of wheels for vehicles, especially motor vehicles, for the production of high pressure or components molded for high pressure, for manufacturing of high-strength engine parts such as camshafts or Piston rods, for the manufacture of for protection against impulses, such as shelling, certain components, such as armor plates, and Protective elements suitable for protecting people are intended in particular against fire. Especially in In the case of the latter application, it does comparatively low weight of the invention Steel sheet and the high strength at the same time positive noticeable.
Erfindungsgemäße Stahlbleche eignen sich aufgrund ihrer rein austenitischen Gefügestruktur darüber hinaus in besonderer Weise zur Herstellung von nichtmagnetischen Bauelementen. Steel sheets according to the invention are suitable because of their purely austenitic structure in addition special way of producing non-magnetic Components.
Schließlich hat sich gezeigt, daß die erfindungsgemäßen Stahlbleche und -bänder auch bei besonders niedrigen Temperaturen ihre Festigkeit beibehalten. Sie eignen sich als solche insbesondere zur Herstellung von in der Kryotechnik eingesetzten Bauelementen, wie Behälter oder Rohre für die Kältetechnik. Finally, it has been shown that the inventive Steel sheets and strips, even at particularly low ones Temperatures maintain their strength. They are suitable as such in particular for the production of in the Components used in cryogenics, such as containers or Pipes for refrigeration.
Besonders sicher erreichen lassen sich die positiven Wirkungen von Bor in erfindungsgemäß verwendetem Stahl, wenn der Borgehalt 0,002 Gew.-% bis 0,01 Gew.-%, insbesondere 0,003 bis 0,008 Gew.-%, beträgt. The positive ones can be reached particularly safely Effects of boron in steel used according to the invention, if the boron content is 0.002% by weight to 0.01% by weight, in particular 0.003 to 0.008% by weight.
Auch der im Bereich von 0,1% bis 1,0% liegende C-Gehalt gewährleistet eine verbesserte Herstellbarkeit erfindungsgemäßer Stahlbleche und -bänder. Bei erfindungsgemäßen Stählen ist aufgrund der Anwesenheit von Kohlenstoff die Bildung intermetallischer Phasen unterdrückt. Risse und Instabilitäten im Bandkantenbereich, wie sie bei den aus den bekannten Stählen erzeugten Stahlbändern entstehen, werden so erheblich reduziert, wobei mit zunehmendem C-Gehalt die Instabilitäten in besonderem Maße abnehmen. Eine weitere Verbesserung der Bandkantenqualität wird durch die Zugabe von Bor erzielt. Im Ergebnis können durch die kombinierte Zugabe von C und B Bandkanteninstabilitäten nahezu vollständig vermieden werden. The C content is also in the range of 0.1% to 1.0% ensures improved manufacturability Steel sheets and strips according to the invention. at steels according to the invention is due to the presence of carbon the formation of intermetallic phases suppressed. Cracks and instabilities in the Band edge area, as in those known from the Steel strips produced from steel are produced in this way significantly reduced, with increasing C content the Reduce instabilities particularly. Another The band edge quality is improved by the addition achieved by boron. As a result, the combined Adding C and B band edge instabilities almost be completely avoided.
Bor substituiert in seiner Wirkung auf die mechanischtechnologischen Eigenschaften das Legierungelement Mn. So ist festgestellt worden, daß ein Stahl mit 20% Mn und 0,003% Bor ein ähnliches Eigenschaftsprofil aufweist wie ein Stahl, der 25% Mn, jedoch kein B enthält. Daher können erfindungsgemäße Leichtbaustähle relativ niedrige Mn-Gehalte bei dennoch vergleichsweise hohen Festigkeiten besitzen. Dies führt zu verminderten Legierungsmittelkosten und erleichtert die schmelzmetallurgische Herstellung eines erfindungsgemäß verwendeten Leichtstahls. Boron substituted in its effect on the mechanical-technological properties of the alloy element Mn. So it has been found that a steel with 20% Mn and 0.003% boron has a property profile similar to a steel containing 25% Mn but no B. Therefore lightweight steels according to the invention can be relatively low Mn contents with comparatively high strengths have. This leads to diminished Alloying agent costs and facilitates the melt-metallurgical production of an inventive used light steel.
Zusätzlich eröffnen die erfindungsgemäß vorgesehenen C- und B-Gehalte ein weites Spektrum der Warmwalzparameter. So ist festgestellt worden, daß die bei Wahl hoher Warmwalzendtemperaturen und Haspeltemperaturen erhaltenen Kennwerte erfindungsgemäßer Stähle im wesentlichen gleich denen sind, die bei niedrigen Warmwalzendtemperaturen und Haspeltemperaturen erhalten werden. Auch diese Unempfindlichkeit bei der Warmbandherstellung begünstigt die einfache Herstellbarkeit erfindungsgemäßer Stahlbleche. In addition, the C- and B contents a wide range of hot rolling parameters. It has been found that the higher the choice Hot rolling end temperatures and reel temperatures obtained Characteristic values of steels according to the invention are essentially the same those who are at low hot rolling end temperatures and Reel temperatures can be obtained. This too Insensitivity favored during hot strip production the ease of manufacture according to the invention Steel sheets.
Aufgrund des auf Gehalte oberhalb von 2,50 Gew.-%, bevorzugt oberhalb von 2,70 Gew.-%, beschränkten Si- Gehaltsweisen erfindungsgemäße Stahlbänder und -bleche eine gegenüber solchen Leichtstahlbändern oder -blechen, die geringe Si-Gehalte besitzen, verbesserte Kaltwalzbarkeit auf. Die hohe Zugabe von Si drückt sich in gleichmäßigeren Streckgrenzen- und Zugfestigkeitswerten sowie in höheren Bruchdehnungs- und Gleichmaßdehnungswerten aus. Si in erfindungsgemäßen Stählen führt darüber hinaus zu höheren r- und n-Werten sowie zu einer isotropen Ausbildung der mechanischen Eigenschaften. Die Obergrenze der aus Al- und Si-Gehalten gebildeten Summe liegt bei 12%, da eine über diese Grenze hinausgehende Summe der Al- und Si-Gehalte die Gefahr einer Versprödung mit sich bringen würde. Due to the content above 2.50% by weight, preferably above 2.70% by weight, limited Si Steel strips and sheets according to the invention one compared to such light steel strips or - Sheets, which have low Si contents, improved Cold rollability. The high addition of Si is expressed in more uniform yield and Tensile strength values as well as higher elongation at break and Uniform expansion values. Si in the invention Steel also leads to higher r and n values and an isotropic formation of the mechanical Characteristics. The upper limit of the Al and Si contents formed amount is 12%, because one over this Sum of the Al and Si contents exceeding the limit Risk of embrittlement.
Erfindungsgemäße Stahlbänder und -bleche lassen sich bevorzugt durch ein Verfahren herstellen, bei dem ein Vormaterial, wie Brammen, Dünnbrammen oder Band, aus einem erfindungsgemäß in der voranstehend erläuterten Weise zusammmengesetzten Stahl gegossen wird, bei dem das gegossene Vormaterial auf = 1100°C erwärmt oder mit einer solchen Temperatur direkt eingesetzt wird, bei dem das vorgewärmte Vormaterial zu Warmband bei einer mindestens 800°C betragenden Warmwalzendtemperatur warmgewalzt wird und bei dem das fertiggewalzte Warmband bei einer 450°C bis 700°C betragenden Haspeltemperatur gehaspelt wird. Steel strips and sheets according to the invention can be preferably produce by a method in which a Primary material such as slabs, thin slabs or strip one according to the invention explained in the above Cast steel is cast in which the cast primary material heated to = 1100 ° C or with such a temperature is used directly at which the preheated raw material to hot strip at a at least 800 ° C hot rolling final temperature is hot rolled and the finished rolled hot strip at a reel temperature of 450 ° C to 700 ° C is coiled.
Indem das Warmband erfindungsgemäß bei mindestens 800°C liegenden Warmwalzendtemperaturen warmgewalzt und bei niedrigen Temperaturen gehaspelt wird, wird die erwähnte positive Wirkung des Kohlenstoffs und insbesondere des Bors im vollen Umfang genutzt. So bewirken Bor und Kohlenstoff bei in diesem Bereich warmgewalzten Bändern höhere Zugfestigkeits- und Streckgrenzen-Werte bei nach wie vor akzeptablen Bruchdehnungswerten. Mit zunehmender Warmwalzendtemperatur nehmen Zugfestigkeit und Streckgrenze ab, während die Dehnungswerte ansteigen. Durch Variation der Walzendtemperaturen im durch die Erfindung vorgegebenen Rahmen lassen sich so die gewünschten Eigenschaften des erhaltenen Stahlbandes gezielt und auf einfache Weise beeinflussen. By the hot strip according to the invention at at least 800 ° C. lying hot rolled end temperatures hot rolled and low temperature is coiled, the mentioned positive effects of carbon and especially of Bors used in full. This is how boron and Carbon for strips hot rolled in this area higher tensile strength and yield strength values for after as before acceptable elongation at break values. With increasing Hot rolling end temperature decrease tensile strength and Yield point while the elongation values increase. By varying the final roll temperatures in the Invention given framework can be so desired properties of the steel strip obtained influence targeted and simple.
Durch die Beschränkung der Haspeltemperatur auf Werte von maximal 700°C wird eine Werkstoffversprödung sicher vermieden. Es ist festgestellt worden, daß es bei höheren Haspeltemperaturen zur Bildung von Sprödphasen kommt, welche beispielsweise Materialabplatzungen nach sich ziehen können und als solche die Weiterverarbeitung erschweren oder sogar unmöglich machen. By limiting the reel temperature to values of Material embrittlement is guaranteed at a maximum of 700 ° C avoided. It has been found that at higher levels Reel temperatures for the formation of brittle phases which, for example, results in material flaking can pull and as such further processing make it difficult or even impossible.
Schon erfindungsgemäß erzeugtes Warmband zeichnet sich durch gute Gebrauchseigenschaften aus. Sollen dünnere Bleche oder Bänder erzeugt werden, so kann das Warmband nach dem Haspeln zu Kaltband kaltgewalzt werden, wobei das Kaltwalzen vorteilhafterweise mit einem Kaltwalzgrad von 30% bis 75% durchgeführt wird. Vorzugsweise wird das erhaltene Kaltband anschließend einer Glühung unterzogen, wobei die Glühtemperaturen zwischen 600°C bis 1100°C liegen sollten. Die Glühung kann dabei in der Haube im Temperaturbereich von 600°C bis 750°C oder im Durchlauf im Glühofen bei Temperaturen von 750°C bis 1100°C durchgeführt werden. Schließlich ist es im Hinblick auf die Kaltverformbarkeit und der Oberflächenausbildung günstig, das Kaltband abschließend zu dressieren. Hot strip already produced according to the invention stands out characterized by good properties. Should be thinner Sheet or strip can be produced, so the hot strip be cold rolled to cold strip after coiling, whereby the cold rolling advantageously with a degree of cold rolling from 30% to 75%. Preferably the cold strip obtained is then annealed subjected to annealing temperatures between 600 ° C should be up to 1100 ° C. The glow can in the Hood in the temperature range from 600 ° C to 750 ° C or in Run in the annealing furnace at temperatures from 750 ° C to 1100 ° C are carried out. After all, it's in With regard to the cold formability and the Favorable surface formation, the cold strip concludes to train.
Nachfolgend wird die Erfindung anhand von Ausführungs- und Vergleichsbeispielen näher erläutert. The invention is explained below on the basis of and comparative examples explained in more detail.
In Tabelle 1 sind die Zusammensetzungen von vier Stählen
A, B, C, D, E angegeben, von denen die Stähle A, B und C der
erfindungsgemäß vorgesehenen Legierung entsprechen,
während es sich bei den Stählen D und E um
Vergleichsbeispiele handelt.
Tabelle 1
Table 1 shows the compositions of four steels A, B, C, D, E, of which steels A, B and C correspond to the alloy provided according to the invention, while steels D and E are comparative examples. Table 1
Die Stähle A bis E der betreffenden Zusammensetzungen sind erschmolzen und zu Brammen vergossen worden. Anschließend sind die Brammen auf eine Temperatur von 1150°C vorgewärmt worden. Die vorgewärmten Brammen sind dann warmgewalzt und anschließend gehaspelt worden. Steels A to E of the compositions in question have melted and been cast into slabs. Then the slabs are at a temperature of 1150 ° C preheated. The preheated slabs are then hot rolled and then coiled.
Die jeweiligen Warmwalzendtemperaturen ET und
Haspeltemperaturen HT sowie die jeweiligen Eigenschaften
Zugfestigkeit Rm, Streckgrenze Re, A50-Dehnung,
Gleichmaßdehnung Agl und n-Wert der erhaltenen Warmbänder
sind in Tabelle 2 angegeben.
Tabelle 2
The respective hot rolling end temperatures ET and reel temperatures HT as well as the respective properties tensile strength R m , yield strength R e , A 50 elongation, uniform elongation A gl and n value of the hot strips obtained are given in Table 2. Table 2
Bis auf das aus dem nicht erfindungsgemäßen Stahl D
hergestellte Band, welches sich nicht kaltwalzen ließ,
sind die erhaltenen Warmbänder anschließend mit einem
Verformungsgrad von ca. 65% kaltgewalzt und bei 950°C
im Durchlauf geglüht worden. Die mechanischen
Eigenschaften der so erhaltenen kaltgewalzten Stahlbleche
sind in Tabelle 3 eingetragen.
Tabelle 3
Except for the strip produced from steel D not according to the invention, which could not be cold rolled, the hot strips obtained were then cold rolled with a degree of deformation of approximately 65% and annealed at 950 ° C. in a continuous process. The mechanical properties of the cold-rolled steel sheets thus obtained are shown in Table 3. Table 3
Es zeigt sich, daß die aus den Stählen A bis C erfindungsgemäß erzeugten Stahlbänder eine hervorragende Kaltverformbarkeit besitzen. Dabei weisen sie bei einer hohen Festigkeit und einer hohen Bruchdehnung jeweils ein ausgeprägt isotropes Verformungsverhalten (r ~ 1, Δr ~ 0) auf. Auch die aus dem kohlenstoffreien, jedoch Bor enthaltenden erfindungsgemäßen Stahl C erzeugten Stahlbänder weisen niedrige Streckgrenzen, erhöhte Bruch- und Gleichmaßdehnungen sowie ein isotropes Umformverhalten auf. It can be seen that the steel strips produced from steels A to C according to the invention have excellent cold formability. With high strength and high elongation at break, they each have a pronounced isotropic deformation behavior (r ~ 1, Δr ~ 0). The steel strips produced from the carbon-free but boron-containing steel C according to the invention also have low yield strengths, increased elongation at break and uniform elongation and isotropic deformation behavior.
Somit eignen sich alle Varianten erfindungsgemäßer Stahlbleche in besonderer Weise für die Herstellung von Karosseriebauteilen, speziell für die Außenbleche einer Automobilkarosserie, von Rädern für Fahrzeuge, insbesondere Kraftfahrzeuge, von nichtmagnetischen Bauelementen, von in der Kryotechnik eingesetzten Behältern, von innenhochdruck- oder außenhochdruckverformten Bauteilen, von Rohren, die insbesondere für die Herstellung von hochfesten Motorteilen, wie Nockenwellen oder Kolbenstangen, bestimmt sind, von für den Schutz gegen impulsförmig auftreffende Belastungen, wie Beschuß, bestimmten Bauelementen oder Schutzelementen, wie Panzerblechen, oder Körperpanzerungen für den menschlichen oder tierischen Körper. Thus, all variants of the invention are suitable Steel sheets in a special way for the production of Body components, especially for the outer panels of one Automobile body, of wheels for vehicles, especially motor vehicles, of non-magnetic Components from cryotechnology Containers, from high pressure or external high-pressure deformed components, of pipes, the especially for the production of high-strength Engine parts, such as camshafts or piston rods, are intended for protection against impulsive impacts such as shelling determine Components or protective elements, such as armor plates, or body armor for human or animal body.
Claims (23)
C: ≤ 1,00%
Mn: 7,00-30,00%
Al: 1,00-10,00%
Si: > 2,50-8,00%
Al + Si: > 3,50-12,00%
B: > 0,00-< 0,01%
sowie wahlweise
Ni: < 8,00%
Cu: < 3,00%
N: < 0,60%
Nb: < 0,30%
Ti: < 0,30%
V: < 0,30%
P: < 0,01%
Rest Eisen und unvermeidbare Verunreinigungen. 1. Steel strip or sheet with good cold formability and higher strength from a light steel with the following composition (in% by weight):
C: ≤ 1.00%
Mn: 7.00-30.00%
Al: 1.00-10.00%
Si:> 2.50-8.00%
Al + Si:> 3.50-12.00%
B:> 0.00- <0.01%
as well as optional
Ni: <8.00%
Cu: <3.00%
N: <0.60%
Nb: <0.30%
Ti: <0.30%
V: <0.30%
P: <0.01%
Balance iron and unavoidable impurities.
Priority Applications (13)
Application Number | Priority Date | Filing Date | Title |
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DE10128544A DE10128544C2 (en) | 2001-06-13 | 2001-06-13 | High-strength, cold-workable sheet steel, process for its production and use of such a sheet |
DK02732754T DK1309734T3 (en) | 2001-06-13 | 2002-06-13 | Process for cold deformation of particularly stable steel and steel strips or steel sheets for the manufacture of steel strips and applications of this steel |
DE50210689T DE50210689D1 (en) | 2001-06-13 | 2002-06-13 | HIGH-STRENGTH, COLD-FORMABLE STEEL AND STEEL STRIP OR BLADE, METHOD FOR THE PRODUCTION OF STEEL STRIP AND USE OF SUCH STEEL |
PT02732754T PT1309734E (en) | 2001-06-13 | 2002-06-13 | Highly stable, steel and steel strips or steel sheets cold-formed, method for the production of steel strips and uses of said steel |
JP2003503854A JP4227010B2 (en) | 2001-06-13 | 2002-06-13 | High strength steel for cold forming and steel strip or steel plate, method for manufacturing steel strip and method for manufacturing steel |
US10/344,192 US20030145911A1 (en) | 2001-06-13 | 2002-06-13 | Highly stable, steel and steel strips or steel sheets cold-formed, method for the production of steel strips and uses of said steel |
CA2414138A CA2414138C (en) | 2001-06-13 | 2002-06-13 | Highly stable, steel and steel strips or steel sheets cold-formed, method for the production of steel strips and uses of said steel |
AT02732754T ATE370258T1 (en) | 2001-06-13 | 2002-06-13 | HIGH-STRENGTH COLD-FORMABLE STEEL AND STEEL STRIP OR SHEET, METHOD FOR PRODUCING STEEL STRIP AND USES OF SUCH STEEL |
CNB028018923A CN1215188C (en) | 2001-06-13 | 2002-06-13 | Highly stable, steel and steel strips or steel sheets cold-formed, method for prodn. of steel strips and uses of said steel |
PCT/EP2002/006480 WO2002101109A1 (en) | 2001-06-13 | 2002-06-13 | Highly stable, steel and steel strips or steel sheets cold-formed, method for the production of steel strips and uses of said steel |
KR10-2003-7001684A KR100536645B1 (en) | 2001-06-13 | 2002-06-13 | Highly stable, steel and steel strips or steel sheets cold-formed, method for the production of steel strips and uses of said steel |
EP02732754A EP1309734B2 (en) | 2001-06-13 | 2002-06-13 | Highly stable, steel and steel strips or steel sheets cold-formed, method for the production of steel strips and uses of said steel |
ES02732754T ES2292762T5 (en) | 2001-06-13 | 2002-06-13 | Steel and high-strength steel strip or sheet, cold malleable, process for manufacturing steel bands and uses of said steel |
Applications Claiming Priority (1)
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DE10128544A DE10128544C2 (en) | 2001-06-13 | 2001-06-13 | High-strength, cold-workable sheet steel, process for its production and use of such a sheet |
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DE10128544C2 DE10128544C2 (en) | 2003-06-05 |
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DE50210689T Expired - Lifetime DE50210689D1 (en) | 2001-06-13 | 2002-06-13 | HIGH-STRENGTH, COLD-FORMABLE STEEL AND STEEL STRIP OR BLADE, METHOD FOR THE PRODUCTION OF STEEL STRIP AND USE OF SUCH STEEL |
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US (1) | US20030145911A1 (en) |
EP (1) | EP1309734B2 (en) |
JP (1) | JP4227010B2 (en) |
KR (1) | KR100536645B1 (en) |
CN (1) | CN1215188C (en) |
AT (1) | ATE370258T1 (en) |
CA (1) | CA2414138C (en) |
DE (2) | DE10128544C2 (en) |
DK (1) | DK1309734T3 (en) |
ES (1) | ES2292762T5 (en) |
PT (1) | PT1309734E (en) |
WO (1) | WO2002101109A1 (en) |
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Cited By (6)
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DE102005062221B3 (en) * | 2005-12-20 | 2007-05-03 | Salzgitter Flachstahl Gmbh | Deformable light alloy steel with TRIP) and TWIP properties useful in production of products having decreased crack liability twinning induced plasticity (TWIP) good ductility and tensile strength without increase in hydrogen embrittlement |
WO2007076748A1 (en) | 2005-12-20 | 2007-07-12 | Salzgitter Flachstahl Gmbh | Deformable lightweight structural steel |
DE202005021771U1 (en) | 2005-12-20 | 2010-02-18 | Salzgitter Flachstahl Gmbh | Formable lightweight steel |
EP2208803A1 (en) | 2009-01-06 | 2010-07-21 | ThyssenKrupp Steel Europe AG | High-tensile, cold formable steel, steel flat product, method for producing a steel flat product and use of a steel flat product |
WO2017220398A1 (en) * | 2016-06-24 | 2017-12-28 | Thyssenkrupp Steel Europe Ag | Vehicle wheel and use thereof |
DE102016211411A1 (en) * | 2016-06-24 | 2017-12-28 | Thyssenkrupp Ag | Vehicle wheel and use |
Also Published As
Publication number | Publication date |
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EP1309734B2 (en) | 2012-06-20 |
US20030145911A1 (en) | 2003-08-07 |
PT1309734E (en) | 2007-11-28 |
DK1309734T3 (en) | 2007-12-27 |
JP2004521192A (en) | 2004-07-15 |
CA2414138A1 (en) | 2002-12-02 |
JP4227010B2 (en) | 2009-02-18 |
KR100536645B1 (en) | 2005-12-14 |
CA2414138C (en) | 2012-12-11 |
KR20030019908A (en) | 2003-03-07 |
ES2292762T5 (en) | 2012-10-29 |
WO2002101109A1 (en) | 2002-12-19 |
DE10128544C2 (en) | 2003-06-05 |
ES2292762T3 (en) | 2008-03-16 |
DE50210689D1 (en) | 2007-09-27 |
CN1215188C (en) | 2005-08-17 |
CN1463297A (en) | 2003-12-24 |
ATE370258T1 (en) | 2007-09-15 |
EP1309734B1 (en) | 2007-08-15 |
EP1309734A1 (en) | 2003-05-14 |
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