EP0484960B2 - Tôles d'acier laminées à froid ayant une excellente formabilité à la presse et procédé de fabrication - Google Patents

Tôles d'acier laminées à froid ayant une excellente formabilité à la presse et procédé de fabrication 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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German (de)
English (en)
Other versions
EP0484960B9 (fr
EP0484960A2 (fr
EP0484960A3 (en
EP0484960B1 (fr
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
Original Assignee
Nippon Steel Corp
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Publication date
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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/fr
Publication of EP0484960A3 publication Critical patent/EP0484960A3/en
Application granted granted Critical
Publication of EP0484960B1 publication Critical patent/EP0484960B1/fr
Publication of EP0484960B2 publication Critical patent/EP0484960B2/fr
Publication of EP0484960B9 publication Critical patent/EP0484960B9/fr
Anticipated expiration legal-status Critical
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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
    • C22C38/14—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. Procédé de fabrication d'un feuillard en acier laminé à froid possédant une excellente capacité de formage à la presse, comprenant les étapes consistant :
    à prévoir une plaque en acier se composant, exprimée en poids, d'une teneur non supérieure à 0,0025% en C, non supérieure à 0,05% en Si, non supérieure à 0,30% en Mn, non inférieure à 0,007% mais non supérieure à 0,030% en P, non supérieure à 0,020% en S, non supérieure à 0,080% en Al en solution, non supérieure à 0,0030% en N, non inférieure à 0,025% mais non supérieure à 0,120% en Ti, non inférieure à 0,003% mais non supérieure à 0,020% en Nb, non supérieure à 0,0002% en B, le reliquat étant constitué de Fe et d'impuretés insignifiantes,
    à chauffer ladite plaque en acier et à réaliser une finition par laminage à chaud à des températures comprises entre 880 et 940°C pour former un feuillard laminé à chaud ;
    à commencer consécutivement le refroidissement dudit feuillard en acier à une température pouvant descendre à au moins 850° en moins de 1,5 seconde à partir de l'achèvement de ladite finition par laminage à chaud en vue de refroidir ledit feuillard en acier à une vitesse de 50 à 200°C/sec., et à bobiner ledit feuillard en acier laminé à chaud à des températures comprises entre 720 et 770°C ;
    à laminer à froid consécutivement ledit feuillard en acier à une vitesse de laminage non inférieure à 70% ; et
    à recuire en présence de recristallisation consécutivement ledit feuillard en acier laminé à froid à des températures comprises entre 750 et 900°C grâce à une recuisson continue,
    ledit feuillard en acier laminé à froid ayant une résistance à la traction dans la direction à 45° (exprimée par T.S45) de 28,5 à 31,0 kgf/mm2 et un facteur r dans la direction à 45° (exprimée par r45) non inférieur à 1,90.
  2. Le procédé selon la revendication 1, dans lequel ledit feuillard en acier est soumis, après ladite recuisson en présence de recristallisation, à une passe de laminage à froid à une vitesse de laminage non inférieure à 0,3% pour amener ledit feuillard en acier à une rugosité de surface (Ra) comprise entre 0,2 et 1,0 µm.
  3. Feuillard en acier laminé à froid possèdant une excellente capacité de formage à la presse, se composant, exprimée en poids, d'une teneur non supérieure à 0,0025% en C, non supérieure à 0,05% en Si, non supérieure à 0,30% en Mn, non inférieure à 0,007% mais non supérieure à 0,030% en P, non supérieure à 0,020% en S, non supérieure à 0,080% en Al en solution, non supérieure à 0,0030% en N,non inférieure à 0,025% mais non supérieure à 0,120% en Ti, non inférieure à 0,003% mais non supérieure à 0,020% en Nb, non supérieure à 0,0002% en B, le reliquat étant constitué de Fe et d'impuretés insignifiantes, ledit feuillard en acier ayant une résistance à la traction dans la direction à 45° (exprimée par T.S45) de 28,5 à 31,0 kgf/mm2 et un facteur r dans la direction à 45° (exprimée par r45) non inférieur à 1,90, ledit feuillard en acier laminé à froid étant productible selon le procédé de la revendication 1 ou 2.
  4. Le feuillard en acier laminé à froid selon la revendication 3, dans lequel une rugosité de surface (Ra) dudit feuillard en acier le long de son axe est comprise entre 0,2 et 1,0 µm.
EP91119058A 1990-11-09 1991-11-08 Tôles d'acier laminées à froid ayant une excellente formabilité à la presse et procédé de fabrication Expired - Lifetime EP0484960B9 (fr)

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 (fr) 1992-05-13
EP0484960A3 EP0484960A3 (en) 1993-03-03
EP0484960B1 EP0484960B1 (fr) 1996-03-13
EP0484960B2 true EP0484960B2 (fr) 2003-05-07
EP0484960B9 EP0484960B9 (fr) 2003-10-29

Family

ID=26563235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119058A Expired - Lifetime EP0484960B9 (fr) 1990-11-09 1991-11-08 Tôles d'acier laminées à froid ayant une excellente formabilité à la presse et procédé de fabrication

Country Status (3)

Country Link
EP (1) EP0484960B9 (fr)
AT (1) ATE135414T1 (fr)
DE (1) DE69117876T3 (fr)

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 (fr) * 1984-07-17 1989-09-26 Mitsumasa Kurosawa Toles d'acier laminees a froid, et methode de fabrication connexe
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 (fr) 2003-10-29
DE69117876D1 (de) 1996-04-18
EP0484960A2 (fr) 1992-05-13
ATE135414T1 (de) 1996-03-15
DE69117876T2 (de) 1996-10-31
EP0484960A3 (en) 1993-03-03
EP0484960B1 (fr) 1996-03-13

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