EP0310376B1 - Verfahren zum Walzen von plattiertem Stahl - Google Patents

Verfahren zum Walzen von plattiertem Stahl Download PDF

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Publication number
EP0310376B1
EP0310376B1 EP19880309025 EP88309025A EP0310376B1 EP 0310376 B1 EP0310376 B1 EP 0310376B1 EP 19880309025 EP19880309025 EP 19880309025 EP 88309025 A EP88309025 A EP 88309025A EP 0310376 B1 EP0310376 B1 EP 0310376B1
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EP
European Patent Office
Prior art keywords
rolling
clad steel
clad
length
steel
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
EP19880309025
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English (en)
French (fr)
Other versions
EP0310376A2 (de
EP0310376A3 (en
Inventor
Toshiki C/O Technical Research Division Hiruta
Ikuo C/O Technical Research Division Yarita
Hideo C/O Technical Research Division Abe
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP24419187A external-priority patent/JPS6487002A/ja
Priority claimed from JP24419087A external-priority patent/JPS6487001A/ja
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Publication of EP0310376A2 publication Critical patent/EP0310376A2/de
Publication of EP0310376A3 publication Critical patent/EP0310376A3/en
Application granted granted Critical
Publication of EP0310376B1 publication Critical patent/EP0310376B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling

Definitions

  • the present invention relates generally to a process for rolling a clad steel which combines iron base plate and stainless steel plate, cupronickel plate, monel metal plate, titanium plate, aluminium plate or the like. More specifically, the present invention relates to a hot rolling process for the clad steel which successfully avoids influence of difference of draft of the different materials of the clad steel.
  • the different material metal plates composed into the clad steel have different deformation resistance in hot rolling. This causes a difference in drafts which results in difference of rolling reductions. Therefore, the thickness ratio of the different material plates is differentiated at the entrance of a rolling mill and at the exit thereof. Namely, the plate made of the material having smaller deformation resistance relative to the other, is reduced at greater magnitude than that of the other. This natually causes difference of expansion length of composed plates thus lowering the yield of the hot rolling process. This is because the material having the smaller deformation resistance tends to flow toward the material having greater deformation resistance to form single layer longitudinal ends where only the smaller deformation resistance material exists.
  • Japanese Patent First (unexamined) Publication Showa 61-232003, published on October 16, 1986, discloses a process for rolling of clad steel, in which pre-form rolling is performed at least at one of longitudinal ends. After pre-forming rolling, reduction rolling is performed for the overall length of the clad steel.
  • the publication further discloses that the preferred length of the end portion of the clad steel, for which pre-forming rolling is to be performed, is equal to the thickness of the clad steel at the maximum.
  • the thickness ratio of the layers will be hereafter referred to as “clad ratio” are formed at the longitudinal ends.
  • the portion where the clad ratio fluctuates, will be hereafter referred to as “uneven clad ratio portion".
  • pre-form rolling is performed over 20% to 80% of the overall length of the clad steel.
  • main reduction rolling is performed at a draft substantially equal to or greater than the draft of the pre-forming rolling.
  • pre-form rolling process and reduction rolling process are performed for at least two passes.
  • the present invention provides a process for rolling elongate clad steel comprising a first layer of a first material and a second layer of a second material, which second material has a lower malleability than that of the first material, which process comprises the steps of:-
  • the reduction rolling is performed on the portion of the clad steel maintained unrolled or, alternatively, over entire length of the clad steel.
  • Figs. 1(A), 1(B), 1(C), 1(D), 1(E), 1(F) and 1(G) illustrate the preferred rolling process according to the present invention.
  • Rolling is performed by upper and lower rolls 1a and 1b by passing a clad steel 4 in the form of a plate, slab or so forth.
  • the clad steel 4 is composed of a pair of layers of different material metals 2 and 3.
  • a portion of the clad steel 4 is subject to pre-form rolling by being passed through the clearance between the upper and lower rolls 1a and 1b.
  • the pre-form rolling is performed from one longitudinal end of the clad steel 4, for a length L0 that is in the range of 20% to 80% of the overall length L of the clad steel 4.
  • reduction rolling is performed from the the opposite longitudinal end of the clad steel 4 over the portion not rolled in the pre-form rolling process.
  • the draft in the reduction rolling is greater than or equal to the draft in the pre-form rolling.
  • the pre-form rolling and reduction rolling processes are performed in one rolling pass cycle.
  • the rolling process is performed at least for two cycles.
  • pre-form rolling is performed on both longitudinal ends of the clad steel 4.
  • pre-form rolling was performed over a distance corresponding to the thickness of the clad steel.
  • the clad steel 4 passes, at first, from one end thereof and then from the other end.
  • the clad steel 4 rolled by the preferred process has a substantially even clad ratio over the entire length.
  • the clad steel rolled by the process shown in Tokkai Showa 61-232003 had portions at both ends where no layer of the metal 2 is formed. The single layer portions extend for lengths of l1 and l2, as seen from Fig. 4. Furthermore, as shown in more detail in Fig. 4, at the regions C1 and C2 adjacent both end portion, the clad ratio becomes uneven. The region where single layer is formed, and uneven clad ratio region are hereafter referred to as "inferior quality region".
  • the clad steel 4 processed by the process of reverse rolling of Figs. 3(A), 3(B), 3(C) and 3(D) had metal layers 2 and 3 where difference in length corresponded to the difference between the expansion ratios of the respective layers.
  • Figs. 5 to 7 show results of experimentally performed rolling utilising the preferred processes.
  • clad steel slab composed of a layer of stainless steel and a layer of soft steel was used.
  • the slab was 200 mm thick and 5 m length.
  • the clad slab was a total draft of 50% in total including the reduction in the pre-form rolling and reduction rolling stages.
  • rolling was performed in two rolling pass cycles.
  • clad steel composed of a layer of stainless steel and a layer of soft steel.
  • the clad steel was in the form of a slab having length of 5m and thickness of 200 mm.
  • Rolling was performed in two pass cycles, each of which pass cycles included pre-form rolling from one longitudinal end of the clad slab and reduction rolling from the other longitudinal end. The draft was 50%.
  • comparative experiments were performed utilizing the conventional process. In the conventional rolling process, pre-form rolling was performed on one longitudinal end portion of the clad slab. Then, reduction rolling was performed from the other end. After one pass cycle, normal rolling was performed for another pass cycle.
  • the length of the inferior quality region in relation to the number of pass cycles performed for obtaining the desired draft versus the original thickness was observed and the results are shown in Fig. 13.
  • the rolling processes were performed for obtaining the desired draft, i.e. 50% by two pass cycles or more substantially reduces the length of the inferior quality region.
  • the preferred process for rolling of clad steel provides a substantially increased yield when pre-form rolling is performed from one end on a portion, the length of which is 20% to 80% of the overall length of the clad steel, and the reduction rolling is performed subsequently from the other end with a draft that is greater than or equal to the draft used in the pre-forming.
  • a still greater increase in yield can be obtained by repeating the foregoing rolling process at least two passes. Differentiating of the roll speed to mate the higher speed roll to the layer having lower malleability, further assist for improvement of the yield by reducing length of inferior quality portions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Claims (4)

  1. Ein Verfahren zum Walzen von länglichem, plattiertem Stahl, der eine erste Schicht aus einem ersten Material und eine zweite Schicht aus einem zweiten Material umfaßt, wobei das zweite Material eine geringere Streckbarkeit als diejenige des ersten Materials aufweist, wobei das Verfahren die Schritte umfaßt:
    (i) Vorformungswalzen des Stahls von einem Ende des plattierten Stahls bei einer ersten Querschnittsverminderung,
    (ii) Querschnittsverminderungswalzen des plattierten Stahls von dem anderen Ende des plattierten Stahls, dadurch gekennzeichnet, daß das Vorformungswalzen über eine Länge von 20% bis 80% der Gesamtlänge der Bramme durchgeführt wird, daß das Verminderungswalzen bei einer zweiten, vorgegebenen Querschnittsabnahme durchgeführt wird, die größer als oder gleich der ersten, vorgegebenen Querschnittsabnahme ist, und daß die Schritte (i) und (ii) wiederholt werden, wie es erwünscht ist.
  2. Ein Verfahren, wie in Anspruch 1 beansprucht, bei dem das Querschnittsverminderungswalzen an dem Bereich des plattierten Stahls durchgeführt wird, der beim Vorformungswalzen ungewalzt gelassen worden ist.
  3. Ein Verfahren, wie es in Anspruch 1 beansprucht ist, bei dem das Querschnittsverminderungswalzen über die gesamte Länge des plattierten Stahls durchgeführt wird.
  4. Ein Verfahren, wie es in Anspruch 1, 2 oder 3 beansprucht ist, das ferner die Schritte umfaßt:
    Festlegen eines Weges zwischen ersten und zweiten Walzen, um den plattierten Stahl während des Walzens dort hindurchzuführen;
    Antreiben der zweiten Walze, die zu der zweiten Schicht gehört, mit einer höheren Drehzahl als diejenige der ersten Walze, die zu der ersten Schicht gehört.
EP19880309025 1987-09-30 1988-09-29 Verfahren zum Walzen von plattiertem Stahl Expired - Lifetime EP0310376B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP24419187A JPS6487002A (en) 1987-09-30 1987-09-30 Rolling method for clad metal sheet
JP24419087A JPS6487001A (en) 1987-09-30 1987-09-30 Rolling method for clad metal sheet
JP244191/87 1987-09-30
JP244190/87 1987-09-30

Publications (3)

Publication Number Publication Date
EP0310376A2 EP0310376A2 (de) 1989-04-05
EP0310376A3 EP0310376A3 (en) 1990-01-17
EP0310376B1 true EP0310376B1 (de) 1993-02-24

Family

ID=26536616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880309025 Expired - Lifetime EP0310376B1 (de) 1987-09-30 1988-09-29 Verfahren zum Walzen von plattiertem Stahl

Country Status (3)

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EP (1) EP0310376B1 (de)
AU (1) AU608064B2 (de)
DE (1) DE3878620T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1018815C2 (nl) 2001-08-24 2003-02-25 Corus Technology B V Werkwijze voor het bewerken van een metalen plak of knuppel, en daarmee vervaardigd product.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE317588C (de) *

Also Published As

Publication number Publication date
AU2290388A (en) 1989-04-06
DE3878620T2 (de) 1993-06-24
EP0310376A2 (de) 1989-04-05
AU608064B2 (en) 1991-03-21
EP0310376A3 (en) 1990-01-17
DE3878620D1 (de) 1993-04-01

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