EP0208679B1 - Verfahren zur verminderung der lokalen temperaturunterschiede in stahlblöcken während des walzens - Google Patents

Verfahren zur verminderung der lokalen temperaturunterschiede in stahlblöcken während des walzens Download PDF

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Publication number
EP0208679B1
EP0208679B1 EP19850901132 EP85901132A EP0208679B1 EP 0208679 B1 EP0208679 B1 EP 0208679B1 EP 19850901132 EP19850901132 EP 19850901132 EP 85901132 A EP85901132 A EP 85901132A EP 0208679 B1 EP0208679 B1 EP 0208679B1
Authority
EP
European Patent Office
Prior art keywords
rolling
slab
temperature
steel slab
heated
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
Application number
EP19850901132
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English (en)
French (fr)
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EP0208679A1 (de
Inventor
Sven Göran ANDERSSON
Per-Olof Norberg
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SSAB Svenskt Stal AB
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SSAB Svenskt Stal AB
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Publication date
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Application filed by SSAB Svenskt Stal AB filed Critical SSAB Svenskt Stal AB
Publication of EP0208679A1 publication Critical patent/EP0208679A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/026—Rolling

Definitions

  • the present invention concerns a way to influence the temperature irregularity in slabs which are heated for hot-rolling i.a. to achieve a better end product, which is more even, has better limit gauge and material-characteristics and to balance loading pikes in the mill stand. The possibility to achieve the attained quality with more simple control equipment in the mill also is achieved.
  • the steel slab Before rolling, the steel slab is heated up to a desired temperature usually in a so called reheating furnace. For bigger slabs it is usual that the steel slab is heated from both sides at the same time. This usually is managed by resting the steel slab during the heating upon a pipe structure which mostly is water cooled. The desired temperature in the slab is reached by supplying energy from e.g. combustion of fuel to both of the over-side and the under-side of the steel slabs.
  • the steel slab with great accuracy can be heated up to the desired temperature level.
  • a lower temperature level than in the other parts of the steel slab is present.
  • the lower temperature level mostly is present as strips across the underside of the slab in the locations, where the steel slab has been in contact with the carrying pipes in the furnace. These strips causes at the succeeding hot-rolling i.a. dimension deviations, lower unformity in quality and e.g. bad flatness if the end product is a steel strip.
  • the disadvantages at the heating partly can be compensated in the following rolling mills with very exact control equipment, but can not be fully eliminated.
  • the technics to get slabs with an uniform heat are that the reheating furnaces have been provided with a metallic, heat resistant material, so called travellers, between the slab and the carrying pipe structure. It is also known, during the rolling, to arrange heat equalization stations, often heat insulated and also heat storing, where the slab is stopped for temperature equalization. The result has not been satisfactory when the loss in temperature and remaining irregularities in temperature still have caused bad limit gauges in the finish rolling and a reduced capacity in the rolling mill. Not even equalization stations with supply of heat have given satisfying results, while as well as areas with colder spots as adjacent areas have been supplied with heat. Irregularities in temperature still have remained even if the cold spots have been eliminated. The different pairs of rolls in the rolling mill also have been provided with a more and more advanced control equipment. Still remaining however, irregularities in temperature in the slab constitute a considerable inconvenience in quality with the present technics of furnace and rolling.
  • the temperature equilization is made by a local heat supplying directed to the colder sections in the steel slab.
  • Heating and rolling by that can be done with an increased degree of freedom and with an improved quality as a result.
  • the equalization of the temperature is brought about by delimited heating the steel slab at a suitable location at the rolling at the section where the steel slab has an irregularity in temperature.
  • the difficulty to locate and control this heating, during the rolling or when the steel slab is moving, makes the proposed invention especially applicable if the heated slab is put in a fix position before the rolling, in that the colder sections are placed straight in front of the firmly installed heating source. In this position of waiting the colder sections of the steel slab is heated from one side during a period of time necessary to get the wished increase in temperature.
  • the proposed method is, when heating of steel slabs in a so called reheating furnace, especially applicable in the position which becomes natural to the slab when pulled out from the furnace and put down upon the roller bed leading to the rolling mill.
  • the local supplying of heat can be generated in many ways.
  • induction heating, gas and oil burning and radiation of electrical heating can be mentioned.
  • Induction heating is preferred why this can be concentrated in an easy way just to the areas which are needed to be heated without affecting surrounding sections worth mentioning.
  • the induction heating also can be computer-controlled to be further precised to the right areas. It also can be freely used in the room without affecting the surrounding environment.
  • Steel slab 4 with a length of 11 m and a cross- section with a width of 1200 mm and a thickness of 220 mm as an average, is heated in a oil-fired furnace 1 up to about 1250°C.
  • the maximum capacity of heating amounts to 300 ton/hour.
  • the steel slab 4 is heated both from its upper and lower side with a great number of oil burners. This is brought about by resting the slab 4 upon eleven water-cooled carrying pipes 2.
  • these are provided with a heat insulating material 13. Despite of that the depression of temperature in the slab 4 will be obvious and gives for rolling unfavourable gradients 14 of temperature.
  • the heated slab will be put in a fix position upon a so called roller bed 5 for further transporting to the mill.
  • a heating source 6 which consists of inductors, which are placed in the roller bed 5 in that way that they are heating the slab 4 only at that side and in those places where the carrying pipes 2 in the furnace 1 have caused unfavourable gradients 14 of temperature.
  • the inductors are supplied from a for the purpose especially arranged electrical interlocking post 7 and can be controlled separately.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (1)

1. Verfahren zum Herabsetzen von Temperaturungleichmäßigkeiten in einer Stahlplatte (4) bein Warmwalzen, wobei die Platte von Induktionserhitzern erhitzt wird, um kalte Stellen zu beseitigen, dadurch gekennzeichnet, daß die Stahlplatte (4) nach einem normalen Erhitzen von stationär angebrachten Induktionserhitzern an den Teilabschnitten erhitzt wird, in denen sich die Temperatur ungünstig unterscheidet, und daß die Platte (4) dabei an einer vorbestimmten Stelle auf dem Rollerbett (5) unmittelbar hinter dem normalen Heizofen (1) stillsteht.
EP19850901132 1984-02-29 1985-02-27 Verfahren zur verminderung der lokalen temperaturunterschiede in stahlblöcken während des walzens Expired EP0208679B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8401102 1984-02-29
SE8401102A SE447069B (sv) 1984-02-29 1984-02-29 Sett att minska lokala temperaturojemnheter hos stalemnen vid varmvalsning

Publications (2)

Publication Number Publication Date
EP0208679A1 EP0208679A1 (de) 1987-01-21
EP0208679B1 true EP0208679B1 (de) 1989-08-30

Family

ID=20354939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850901132 Expired EP0208679B1 (de) 1984-02-29 1985-02-27 Verfahren zur verminderung der lokalen temperaturunterschiede in stahlblöcken während des walzens

Country Status (5)

Country Link
EP (1) EP0208679B1 (de)
AU (1) AU3995885A (de)
DE (1) DE3572608D1 (de)
SE (1) SE447069B (de)
WO (1) WO1985003891A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI552812B (zh) * 2012-01-25 2016-10-11 Sms Group Gmbh 製造金屬帶的方法與設備
JP6428884B1 (ja) 2017-09-11 2018-11-28 愛知製鋼株式会社 磁気センサ用感磁ワイヤおよびその製造方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2417030A (en) * 1943-12-22 1947-03-04 Olin Ind Inc Electric induction furnace for continuously heating metal strips
US2722589A (en) * 1950-11-30 1955-11-01 Ohio Crankshaft Co Method and apparatus for uniformly heating intermittently moving metallic material
US3080468A (en) * 1960-03-07 1963-03-05 Lindberg Eng Co Billet heater control and method
US3264856A (en) * 1963-06-26 1966-08-09 Canada Steel Co Hot strip mill
GB1040420A (en) * 1963-11-19 1966-08-24 United Eng Foundry Co Method and apparatus for controlling the temperature of hot strip
GB1243009A (en) * 1967-12-09 1971-08-18 English Electric Co Ltd Methods and apparatus for heat treating a body
US3471673A (en) * 1968-02-19 1969-10-07 United States Steel Corp Apparatus for inductively heating a traveling metal slab
US3587268A (en) * 1968-09-17 1971-06-28 Francis H Bricmont Workpiece temperature equalization in rolling of steel
US3596036A (en) * 1970-03-16 1971-07-27 Ajax Magnethermic Corp Induction heater
US3715556A (en) * 1970-10-05 1973-02-06 Park Ohio Industries Inc Slab heating method and apparatus
US4182146A (en) * 1976-01-10 1980-01-08 Hoesch Werke Aktiengesellschaft Hot rolling mill
JPS531614A (en) * 1976-06-26 1978-01-09 Toyo Alum Kk Induction heating equipment
EP0048503B1 (de) * 1978-04-27 1985-08-21 Encomech Engineering Services Limited Hitzeschild für band- oder knüppelförmiges Material

Also Published As

Publication number Publication date
EP0208679A1 (de) 1987-01-21
AU3995885A (en) 1985-09-24
SE447069B (sv) 1986-10-27
SE8401102L (sv) 1985-08-30
DE3572608D1 (en) 1989-10-05
WO1985003891A1 (en) 1985-09-12
SE8401102D0 (sv) 1984-02-29

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