EP0240052A1 - Method to preheat billets with a saving of energy - Google Patents

Method to preheat billets with a saving of energy Download PDF

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Publication number
EP0240052A1
EP0240052A1 EP87200435A EP87200435A EP0240052A1 EP 0240052 A1 EP0240052 A1 EP 0240052A1 EP 87200435 A EP87200435 A EP 87200435A EP 87200435 A EP87200435 A EP 87200435A EP 0240052 A1 EP0240052 A1 EP 0240052A1
Authority
EP
European Patent Office
Prior art keywords
furnace
preheating
rolling
heating
heating furnace
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
EP87200435A
Other languages
German (de)
French (fr)
Other versions
EP0240052B1 (en
Inventor
Geremia Nonini
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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
Application filed by Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Priority to AT87200435T priority Critical patent/ATE64758T1/en
Publication of EP0240052A1 publication Critical patent/EP0240052A1/en
Application granted granted Critical
Publication of EP0240052B1 publication Critical patent/EP0240052B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/466—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 metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling

Definitions

  • the invention is applied correctly in cooperation with a continuous casting plant.
  • the known art envisages that billets, blooms and slabs coming from a continuous casting plant are heated before passing on to the rolling cycle.
  • the known art visualises that the cold charges forming a buffer stock are heated before moving to the rolling cycle.
  • the known art envisages also that during stoppages of rolling for any reason the material leaving the continuous casting is parked so as to become a cold charge.
  • DE-A-3.310.867 discloses a multiple furnace to heat billets.
  • JP-A-5 820301 provides a multiple furnace to heat billets.
  • JP-A-59 190327 also provides a unit consisting of a heating furnace and a pre-heating furnace, separate from each other but positioned in working sequence.
  • the invention is therefore obtained with a method to preheat billets, blooms or slabs, before rolling, as they arrive from a store of cold charges or from continuous casting, such method involving a preheating furnace and a heating furnace and being characterized in that the preheating and heating- furnaces are connected in coordination, in which method: -
  • a preheating and holding furnace and a heating furnace are provided. These two furnaces are positioned in series and connected at position 16 and cooperate with each other in enabling the material to pass through correctly.
  • the material forming a cold charge 15 and coming from a cold charge store 10 enters a preheating furnace 12 and passes on to a heating furnace 13 and then to a rolling line.
  • Material 17 consisting of product arriving from continuous casting 11 and retained in a holding phase, since the rolling plant 14 is being maintained or having the rolling groove changed, is parked provisionally in the preheating furnace 12 before being moved to the heating furnace 13 and then to the rolling process 14.
  • the invention therefore provides for the material coming from continuous casting and waiting to pass to the temporarily halted rolling plant to be parked transiently in the preheating furnace 12.

Abstract

Method to preheat billets, blooms or slabs, before rolling (14), as they arrive from a store of cold charges (10) or from continuous casting (11), such method involving a preheating furnace (12) and a heating furnace (13), the preheating (12) and heating (13) furnaces being connected in coordination, in which method:
  • - material (15) arriving from the store of cold charges (10) passes through the preheating furnace (12) and the heating furnace (13),
  • - material (17) arriving from the continuous casting (11) but momentarily halted due to work in progress in the rolling plant (14) is transiently stored in the preheating furnace (12) and is then passed through the heating furnace (13) when such work has ended and rolling can restart,
  • - and material (18) coming from the continuous casting (11) passes through the heating furnace (13) before reaching the rolling process (14) during a normal cycle.

Description

  • This invention concerns a method to preheat and heat billets, blooms or slabs so as to optimise their temperature for a successive rolling operation.
  • The invention provides for the overall form of the method to lead to a saving of energy by a reduction of energy consumption.
  • The invention is applied correctly in cooperation with a continuous casting plant.
  • The known art envisages that billets, blooms and slabs coming from a continuous casting plant are heated before passing on to the rolling cycle.
  • Moreover, the known art visualises that the cold charges forming a buffer stock are heated before moving to the rolling cycle.
  • The known art envisages also that during stoppages of rolling for any reason the material leaving the continuous casting is parked so as to become a cold charge.
  • JP-A-57 202907 discloses that billets and blooms are occasionally switched momentarily from the normal path which they follow before reaching the pre-heating furnace, and are deposited in an auxiliary heating furnace.
  • US-A-4,311,454 provides for a traditional system to transfer blooms and billets, the system being improved by an additional movement imparted to the blooms and billets so as to make them pass from a pre-heating furnace to a heating furnace with a change in their axis of feed.
  • DE-A-3.310.867 discloses a multiple furnace to heat billets.
  • JP-A-5 820301 provides a multiple furnace to heat billets.
  • JP-A-58 204128 provides a unit consisting of a heating furnace and pre-heating furnace positioned in parallel.
  • JP-A-59 190327 also provides a unit consisting of a heating furnace and a pre-heating furnace, separate from each other but positioned in working sequence.
  • The present applicant has established that these systems of handling billets, blooms and slabs entail a considerable waste of energy with high consumption and great waste. He has therefore set himself the problem of determining a method for handling these products which is such that the heating operations take place in an optimised manner from the point of view of an energy balance as well.
  • The invention is therefore obtained with a method to preheat billets, blooms or slabs, before rolling, as they arrive from a store of cold charges or from continuous casting, such method involving a preheating furnace and a heating furnace and being characterized in that the preheating and heating- furnaces are connected in coordination, in which method: -
    • - material arriving from the store of cold charges passes through the preheating furnace and the heating furnace,
    • - material arriving from the continuous casting but momentarily halted due to work in progress in the rolling plant is transiently stored in the preheating furnace and is then passed through the heating furnace when such work has ended and rolling can restart,
    • - and material coming from the continuous casting passes through the heating furnace before reaching the rolling process during a normal cycle.
  • According to the invention the material to be rolled can come from a cold charge store or buffer store and be parked temporarily to await re-approval or maintenance of the rolling plant or can pass continuously through directly from the continuous casting.
  • According to the invention a preheating and holding furnace and a heating furnace are provided. These two furnaces are positioned in series and connected at position 16 and cooperate with each other in enabling the material to pass through correctly.
  • According to the invention it is possible to envisage one single furnace divided into two diversely specialized zones.
  • The attached figure shows diagrammatically the preferred embodiment employed to illustrate the invention.
  • According to the invention the material forming a cold charge 15 and coming from a cold charge store 10 enters a preheating furnace 12 and passes on to a heating furnace 13 and then to a rolling line.
  • Material 17 consisting of product arriving from continuous casting 11 and retained in a holding phase, since the rolling plant 14 is being maintained or having the rolling groove changed, is parked provisionally in the preheating furnace 12 before being moved to the heating furnace 13 and then to the rolling process 14.
  • Likewise, material 18 coming from continuous casting 11 goes directly to the rolling process 14 after being heated in the heating furnace 13.
  • The invention therefore provides for the material coming from continuous casting and waiting to pass to the temporarily halted rolling plant to be parked transiently in the preheating furnace 12.

Claims (3)

1 - Method to preheat billets, blooms or slabs, before rolling (14), as they arrive from a store of cold charges (10) or from continuous casting (11), such method involving a preheating furnace (12) and a heating furnace (13) and being characterized in that the preheating (12) and heating (13) furnaces are connected in coordination , in which method:
- material (15) arriving from the store of cold charges (10) passes through the preheating furnace (12) and the heating furnace (13),
- material (17) arriving from the continuous casting (11) but momentarily halted due to work in progress in the rolling plant (14) is transiently stored in the preheating furnace (12) and is then passed through the heating furnace (13) when such work has ended and rolling can restart,
- and material (18) coming from the continuous casting (11) passes through the heating furnace (13) before reaching the rolling process (14) during a normal cycle.
2 - Method as claimed in Claim 1, in which the heating (13) and preheating (12) furnaces are separate but cooperate (16) for the passage of the material (15-17).
3 - Method as claimed in Claim 1, in which the heating (13) and preheating (12) furnaces form one single furnace comprising two diversely specialized zones.
EP87200435A 1986-04-04 1987-03-10 Method to preheat billets with a saving of energy Expired - Lifetime EP0240052B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87200435T ATE64758T1 (en) 1986-04-04 1987-03-10 PROCESS FOR PREHEATING BILLETS WITH ENERGY SAVING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6034986U 1986-04-04
IT8660349U IT210788Z2 (en) 1986-04-04 1986-04-04 BILLETS PREHEATING PROCEDURE WITH ENERGY RECOVERY.

Publications (2)

Publication Number Publication Date
EP0240052A1 true EP0240052A1 (en) 1987-10-07
EP0240052B1 EP0240052B1 (en) 1991-06-26

Family

ID=11290412

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87200435A Expired - Lifetime EP0240052B1 (en) 1986-04-04 1987-03-10 Method to preheat billets with a saving of energy

Country Status (5)

Country Link
EP (1) EP0240052B1 (en)
AT (1) ATE64758T1 (en)
DE (1) DE3770968D1 (en)
ES (1) ES2023181B3 (en)
IT (1) IT210788Z2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0499851A1 (en) * 1991-02-19 1992-08-26 DANIELI & C. OFFICINE MECCANICHE S.p.A. Tunnel system for a hot strip rolling mill linked to the continuous casting of thin slabs
BE1004663A3 (en) * 1991-03-05 1993-01-05 Bekaert Sa Nv Multiple wire treatment device
EP3608469A2 (en) 2018-08-06 2020-02-12 E.G.O. Elektro-Gerätebau GmbH Laundry dryer and method for drying laundry with a laundry dryer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311454A (en) * 1978-06-21 1982-01-19 Itoh Iron & Steel Works Co. Ltd. Method of soaking steel pieces
DE3310867A1 (en) * 1983-03-25 1984-10-04 Mannesmann AG, 4000 Düsseldorf Cast-rolling plant for rolling continuously cast material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311454A (en) * 1978-06-21 1982-01-19 Itoh Iron & Steel Works Co. Ltd. Method of soaking steel pieces
DE3310867A1 (en) * 1983-03-25 1984-10-04 Mannesmann AG, 4000 Düsseldorf Cast-rolling plant for rolling continuously cast material

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 55 (M-198)[1200], 5th March 1983; & JP-A-57 202 907 (SHIN NIPPON SEITETSU K.K.) 13-12-1982 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 95 (M-209)[1240], 21st April 1983; & JP-A-58 20 301 (SHIN NIPPON SEITETSU K.K.) 05-02-1983 *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 46 (C-212)[1483], 29th February 1984; & JP-A-58 204 128 (NIPPON KOKAN K.K.) 28-11-1983 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 45 (C-268)[1768], 26th February 1985; & JP-A-59 190 327 (SUMITOMO KINZOKU KOGYO K.K.) 29-10-1984 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0499851A1 (en) * 1991-02-19 1992-08-26 DANIELI & C. OFFICINE MECCANICHE S.p.A. Tunnel system for a hot strip rolling mill linked to the continuous casting of thin slabs
US5212856A (en) * 1991-02-19 1993-05-25 Danieli & C. Officine Meccaniche Spa Tunnel system for a hot strip rolling mill linked to the continuous casting of thin slabs
BE1004663A3 (en) * 1991-03-05 1993-01-05 Bekaert Sa Nv Multiple wire treatment device
TR25656A (en) * 1991-03-05 1993-07-01 Bekaert Sa Nv INSTALATION HOLDING THE BIRCOK WIRE PROCESSING
EP3608469A2 (en) 2018-08-06 2020-02-12 E.G.O. Elektro-Gerätebau GmbH Laundry dryer and method for drying laundry with a laundry dryer
US11021837B2 (en) 2018-08-06 2021-06-01 E.G.O. Elektro-Geraetebau Gmbh Tumble dryer and method for drying laundry using a tumble dryer

Also Published As

Publication number Publication date
DE3770968D1 (en) 1991-08-01
EP0240052B1 (en) 1991-06-26
IT8660349V0 (en) 1986-04-04
IT210788Z2 (en) 1989-01-11
ES2023181B3 (en) 1992-01-01
ATE64758T1 (en) 1991-07-15

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