EP0310376A2 - Procédé de laminage d'acier plaqué - Google Patents

Procédé de laminage d'acier plaqué Download PDF

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Publication number
EP0310376A2
EP0310376A2 EP88309025A EP88309025A EP0310376A2 EP 0310376 A2 EP0310376 A2 EP 0310376A2 EP 88309025 A EP88309025 A EP 88309025A EP 88309025 A EP88309025 A EP 88309025A EP 0310376 A2 EP0310376 A2 EP 0310376A2
Authority
EP
European Patent Office
Prior art keywords
rolling
clad steel
length
reduction
clad
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.)
Granted
Application number
EP88309025A
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German (de)
English (en)
Other versions
EP0310376B1 (fr
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/fr
Publication of EP0310376A3 publication Critical patent/EP0310376A3/en
Application granted granted Critical
Publication of EP0310376B1 publication Critical patent/EP0310376B1/fr
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 redults in difference of rolling reductions. Therefore, 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 to 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 the 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 one of longitudinal ends. After pre-forming rolling, reduction rolling is performed for 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 a draft of the pre-forming rolling.
  • pre-form rolling process and reduction rolling process are performed for at least two passes.
  • a process for rolling an elongate clad steel composed of a first layer of a first material and a second layer of a second material which has lower malleability than that of the first material comprises the steps of: performing pre-form rolling at a first given draft from one longitudinal end of the elongated clad steel for 20% to 80% of the overall length of clad steel; performing reduction rolling for a second given draft which is greater than or equal to the first given draft from the other longitudinal end of the elongated clad steel for rolling; and repeating the cycle of the pre-form rolling and reduction rolling at least for two cycles.
  • the reduction rolling is performed on the portion of the clad steel maintained unrolled or, alternatively, for over entire length of the clad steel.
  • a process for rolling an elongate clad steel composed of a first layer of a first material and a second layer of a second material which has lower mallerability than that of the first material comprises the steps of: defining a path of the elongated clad steel between a first and second rolls to pass the clad steel therethrough during rolling; driving the second roll mating with the second layer of the clad steel at higher speed than that of the first roll which mates the first layer of the clad steel; performing pre-form rolling at a first given draft from one longitudinal end of the elongated clad steel 20% to 80% of the overall length of clad steel; performing reduction rolling at a second given draft which is greater than or equal to the first given draft from the other longitudinal end of the elongated clad steel; and repeating the cycle of the pre-form rolling and reduction rolling at least for two cycles.
  • the reduction rolling is performed on the portion of the clad steel maintained unrolled or, alternatively, for over entire length of the clad steel.
  • Figs. 1(A), 1(B), 1(C), 1(D), 1(E), 1(F) and 1(G) illustrates 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 layer of different material metals 2 and 3.
  • a portion of the clad steel 4 is subject 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 nopt 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 l1 and l2 , as seen from Fig. 4 .
  • the clad ratio becomes uneven.
  • the rigion 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.
  • Figs. 11 and 13 Results of the experiments are shown in Figs. 11 and 13 .
  • the result of the comparative example is shown by solid line
  • the result of the preferred process with equal roll speed is shown by the broken line
  • the result of the preferred process with different roll speed is shown by the one-dot chain line.
  • Figs. 11 and 12 by setting the pre-form rolling length within the range of 20% to 80% of the overall length of the slab, substantial reduction of the single layer region (l1 + l2) and the uneven clad ratio region (C1 + C2) can be obtained.
  • the length of single layer region (l1 + l2) and the uneven clad ratio region (C1 + C2) in the slab rolled by the preferred process of the present invention is much smaller than that of the slab rolled by the conventional process.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
EP19880309025 1987-09-30 1988-09-29 Procédé de laminage d'acier plaqué Expired - Lifetime EP0310376B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP244190/87 1987-09-30
JP244191/87 1987-09-30
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

Publications (3)

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

Family

ID=26536616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880309025 Expired - Lifetime EP0310376B1 (fr) 1987-09-30 1988-09-29 Procédé de laminage d'acier plaqué

Country Status (3)

Country Link
EP (1) EP0310376B1 (fr)
AU (1) AU608064B2 (fr)
DE (1) DE3878620T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7546756B2 (en) 2001-08-24 2009-06-16 Corus Technology Bv Method for processing a metal slab or billet, and product produced using said method

Family Cites Families (1)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7546756B2 (en) 2001-08-24 2009-06-16 Corus Technology Bv Method for processing a metal slab or billet, and product produced using said method

Also Published As

Publication number Publication date
AU2290388A (en) 1989-04-06
EP0310376B1 (fr) 1993-02-24
EP0310376A3 (en) 1990-01-17
AU608064B2 (en) 1991-03-21
DE3878620T2 (de) 1993-06-24
DE3878620D1 (de) 1993-04-01

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