EP0484960B2 - Kaltgewalztes Stahlband mit hervorragender Pressverformbarkeit und Verfahren zur Herstellung - Google Patents

Kaltgewalztes Stahlband mit hervorragender Pressverformbarkeit und Verfahren zur Herstellung Download PDF

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Publication number
EP0484960B2
EP0484960B2 EP91119058A EP91119058A EP0484960B2 EP 0484960 B2 EP0484960 B2 EP 0484960B2 EP 91119058 A EP91119058 A EP 91119058A EP 91119058 A EP91119058 A EP 91119058A EP 0484960 B2 EP0484960 B2 EP 0484960B2
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EP
European Patent Office
Prior art keywords
steel strip
less
cold
rolled steel
press formability
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 - Lifetime
Application number
EP91119058A
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English (en)
French (fr)
Other versions
EP0484960B9 (de
EP0484960A2 (de
EP0484960A3 (en
EP0484960B1 (de
Inventor
Teruaki c/o Hirohata Seitetsusho Yamada
Masahiko c/o Hirohata Seitetsusho Oda
Yuzo c/o Hirohata Seitetsusho Nishimoto
Hiroshi c/o Hirohata Seitetsusho Kubo
Michihiro c/o Hirohata Seitetsusho Nouno
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.)
Nippon Steel Corp
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Nippon Steel Corp
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Priority claimed from JP2302697A external-priority patent/JPH0762209B2/ja
Priority claimed from JP2321054A external-priority patent/JPH0747796B2/ja
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0484960A2 publication Critical patent/EP0484960A2/de
Publication of EP0484960A3 publication Critical patent/EP0484960A3/en
Application granted granted Critical
Publication of EP0484960B1 publication Critical patent/EP0484960B1/de
Publication of EP0484960B2 publication Critical patent/EP0484960B2/de
Publication of EP0484960B9 publication Critical patent/EP0484960B9/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0421—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the working steps
    • C21D8/0426—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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0421—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0447—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing

Definitions

  • This invention relates to a cold-rolled steel strip having excellent combined press-formability and also to a method of producing such a steel strip by continuous annealing.
  • C is a very important element for cbtaining the cold-rolled steel strip, having r 45 of not less than 1.90, by continuous annealing, and if the C content exceeds 0 0025%, this characteristic value can not be obtained. Therefore, the upper limit of the C content should be not more than 0.0025%.
  • the crystal grains of the hot-rolled strip fine, it is necessary to cool the strip down to at least 850°C at a rate of not less than 50°C/sec. and within at least 1.5 sec. after the finishing rolling. If the cooling is started later than the above time, or if the temperature range of the cooling, as well as the cooling rate (speed), do not satisfy the above conditions, the crystal grains become large, so that the r 45 value of not less than 1.90 can not be obtained.
  • the cold rolling rate should be not less than 70%.
  • Sample No. 13 is the comparative example in which EI 45 is quite high (55.7%). but T.S 45 is low (27.5 kgf/mm 2 ) (These characteristic values are similar to those as disclosed in Japanese Patent Unexamined Publication No. 63-76848), and the press defective percentage is poor (4.1%), as shown in Table 2.
  • Sample No. 14 is the comparative example in which C.T is low (620°c) prepared generally according to the method of Japanese Patent Unexamined Publication No. 61-276930. and the r 45 value is only 1.83. and the press defective percentage is poor (3.1%). as shown in Table 2.
  • the cold-rolled steel strip according to the above subject matter (1) of the present invention achieves excellent combined press formability.
  • the method as mentioned in the above subject matter (2) of the present invention there can be produced the cold-rolled steel strip having excellent combined pressed formability.
  • the cold-rolled steel strip can exhibit more excellent combined press formability.
  • the cold-rolled steel strip having more excellent combined press formability there can be produced the cold-rolled steel strip having more excellent combined press formability. Therefore, the present invention is of great industrial value.

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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)

Claims (4)

  1. Verfahren zur Herstellung eines Kaltgewalzten Stahlbandes mit hervorragender Preßverformbarkeit, mit den folgenden Schritten:
       Bereitstellen einer Stahlbramme, bestehend aus höchstens 0,0025 Gew.-% C, höchstens 0,05 Gew.-% Si, höchstens 0,0030 Gew.-% Mn, mindestens 0,025 Gew.-% und höchstens 0,030 Gew.-% P, höchstens 0,020 Gew.-% S, höchstens 0,080 Gew.-% löslichem Al, höchstens 0,0030 Gew.-% N, mindestens 0,025 Gew.-% und höchstens 0,120 Gew.-% Ti, mindestens 0,003 Gew.-% und höchstens 0,020 Gew.-% Nb, höchstens 0,0002 Gew.-% B, wobei der Rest aus Fe und zufälligen Verunreinigungen besteht;
    Erhitzen der Stahlbramme und Warmfertigwalzen bei Endtemperaturen von 880 bis 940°C zum Formen eines Warmbandes;
    anschließender Beginn der Abkühlung des Stahlbandes auf mindestens 850°C innerhalb von 1,5 s nach Beendigung des Warmfertigwalzens, um das Stahlband mit einer Geschwindigkeit von 50 bis 200°C/s abzukühlen, und Aufwickeln des warmgewalzten Stahlbandes bei Temperaturen von 720 bis 770°C;
    anschließendes Kaltwalzen des Stahlbandes mit einem Walzreduktionsgrad von mindestens 70%; und
    anschließendes Rekristallisationsglühen des kaltgewalzten Stahlbandes bei Temperaturen von 750 bis 900°C mittels Durchlaufglühen,
       wobei das kaltgewalzte Stahlband eine Zugfestigkeit in 45°-Richtung (ausgedrückt als TS45) von 28,5 bis 31,0 kp/mm2 und einen r-Wert in 45°-Richtung (ausgedrückt als r45) von mindestens 1,90 aufweist.
  2. Verfahren nach Anspruch 1, wobei das Stahlband nach dem Rekristallisationsglühen einem Nachwalzen mit einem Walzreduktionsgrad von mindestens 0,3% unterworfen wird, um die Oberflächenrauhigkeit (Ra) des Stahlbandes auf 0,2 bis 1,0 µm zu bringen.
  3. Kaltgewalztes Stahlband mit hervorragender kombinierter Preßverformbarkeit, bestehend aus höchstens 0,0025 Gew.-% C, höchstens 0,05 Gew.-% Si, höchstens 0,30 Gew.-% Mn, mindestens 0,007 Gew.-% und höchstens 0,030 Gew.-% P, höchstens 0,020 Gew.-% S, höchstens 0,080 Gew.-% löslichem Al, höchstens 0,0030 Gew.-% N, mindestens 0,025 Gew.-% und höchstens 0,120 Gew.-% Ti, mindestens 0,003 Gew.-% und höchstens 0,020 Gew.-% Nb, höchstens 0,0002 Gew.-% B, wobei der Rest aus Fe und zufälligen Verunreinigungen besteht, wobei das Stahlband eine Zugfestigkeit in 45°-Richtung (ausgedrückt als TS45) von 28,5 bis 31,0 kp/mm2 und einen r-Wert in 45°-Richtung (ausgedrückt als r45) von mindestens 1,90 aufweist,
    wobei das kaltgewalzte Stahlband mit dem Verfahren nach Anspruch 1 oder 2 herstellbar ist.
  4. Kaltgewalztes Stahlband nach Anspruch 3, wobei eine Oberflächenrauhigkeit (Ra) des Stahlbandes längs seiner Mittelachse 0,2 bis 1,0 µm beträgt.
EP91119058A 1990-11-09 1991-11-08 Kaltgewalztes Stahlband mit hervorragender Pressverformbarkeit und Verfahren zur Herstellung Expired - Lifetime EP0484960B9 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2302697A JPH0762209B2 (ja) 1990-11-09 1990-11-09 複合プレス成形性の優れた冷延鋼板及びその製造方法
JP302697/90 1990-11-09
JP30269790 1990-11-09
JP321054/90 1990-11-27
JP2321054A JPH0747796B2 (ja) 1990-11-27 1990-11-27 複合プレス成形性の極めて優れた冷延鋼板及びその製造方法
JP32105490 1990-11-27

Publications (5)

Publication Number Publication Date
EP0484960A2 EP0484960A2 (de) 1992-05-13
EP0484960A3 EP0484960A3 (en) 1993-03-03
EP0484960B1 EP0484960B1 (de) 1996-03-13
EP0484960B2 true EP0484960B2 (de) 2003-05-07
EP0484960B9 EP0484960B9 (de) 2003-10-29

Family

ID=26563235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119058A Expired - Lifetime EP0484960B9 (de) 1990-11-09 1991-11-08 Kaltgewalztes Stahlband mit hervorragender Pressverformbarkeit und Verfahren zur Herstellung

Country Status (3)

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EP (1) EP0484960B9 (de)
AT (1) ATE135414T1 (de)
DE (1) DE69117876T3 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69225395T2 (de) * 1991-02-20 1998-09-10 Nippon Steel Corp Kaltgewalztes stahlblech und galvanisiertes kaltgewalztes stahlblech mit hervorragender formbarkeit und einbrennhärtbarkeit und verfahren zu deren herstellung
JPH06339775A (ja) * 1991-07-15 1994-12-13 Nippon Steel Corp ニッケルおよびニッケル合金材の溶接方法
US5356493A (en) * 1992-07-08 1994-10-18 Nkk Corporation Blister-resistant steel sheet and method for producing thereof
FR2736933B1 (fr) * 1995-07-18 1997-08-22 Lorraine Laminage Procede de fabrication d'une bande de tole mince a emboutissabilite amelioree
FR2742769B1 (fr) * 1995-12-20 1998-01-16 Lorraine Laminage Acier lamine a froid presentant une bonne aptitude au soudage et au brasage
KR102462210B1 (ko) * 2014-10-09 2022-11-03 티센크루프 스틸 유럽 악티엔게젤샤프트 냉간 압연되고 재결정 어닐링된 평강 제품 및 평강 제품의 제조 방법
KR102243985B1 (ko) * 2017-01-06 2021-04-22 제이에프이 스틸 가부시키가이샤 고강도 냉연 강판 및 그 제조 방법

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4504326A (en) * 1982-10-08 1985-03-12 Nippon Steel Corporation Method for the production of cold rolled steel sheet having super deep drawability
CA1259827A (en) * 1984-07-17 1989-09-26 Mitsumasa Kurosawa Cold-rolled steel sheets and a method of manufacturing the same
US4889566A (en) * 1987-06-18 1989-12-26 Kawasaki Steel Corporation Method for producing cold rolled steel sheets having improved spot weldability
JPH07103422B2 (ja) * 1988-01-14 1995-11-08 新日本製鐵株式会社 良加工性高強度冷延鋼板の製造方法
JPH02194126A (ja) * 1989-01-20 1990-07-31 Sumitomo Metal Ind Ltd 焼付硬化性鋼板の製造方法

Also Published As

Publication number Publication date
DE69117876T3 (de) 2003-10-30
EP0484960B9 (de) 2003-10-29
DE69117876D1 (de) 1996-04-18
EP0484960A2 (de) 1992-05-13
ATE135414T1 (de) 1996-03-15
DE69117876T2 (de) 1996-10-31
EP0484960A3 (en) 1993-03-03
EP0484960B1 (de) 1996-03-13

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