FR2260401A1 - Hot-rolling thick steel plate on a four-high mill - using detectors to indicate start of gamma-alpha transformation - Google Patents

Hot-rolling thick steel plate on a four-high mill - using detectors to indicate start of gamma-alpha transformation

Info

Publication number
FR2260401A1
FR2260401A1 FR7404222A FR7404222A FR2260401A1 FR 2260401 A1 FR2260401 A1 FR 2260401A1 FR 7404222 A FR7404222 A FR 7404222A FR 7404222 A FR7404222 A FR 7404222A FR 2260401 A1 FR2260401 A1 FR 2260401A1
Authority
FR
France
Prior art keywords
rolling
gamma
hot
transformation
alpha transformation
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
FR7404222A
Other languages
French (fr)
Other versions
FR2260401B3 (en
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.)
Institut de Recherches de la Siderurgie Francaise IRSID
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
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 Institut de Recherches de la Siderurgie Francaise IRSID filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Priority to FR7404222A priority Critical patent/FR2260401A1/en
Publication of FR2260401A1 publication Critical patent/FR2260401A1/en
Application granted granted Critical
Publication of FR2260401B3 publication Critical patent/FR2260401B3/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or 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
    • B21B1/38—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
    • B21B2001/386—Plates

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

Process for controlling hot-rolling in a rolling mill producing thick products, esp. thick plate in steels which gamma - alpha transformation during cooling, and where the temp. of the Curie pt. is above the gamma - alpha transformation temp. for the conditions of rolling. The novelty is that after each rolling pass the product is inspected on both sides of the rolling mill by sensors which induce eddy currents in the metal in order to detect the moment where the gamma - alpha transformation start. The rolling conditions are then controlled so that this transformation only occurs in accordance with the programme required, i.e. after the last pass during rolling, or during cooling after rolling. Hot-rolling thick plate on four-high mills. The gamma - alpha transformation temp. depends on steel compsn. and rate of cooling, but this process permits its accurate detection.
FR7404222A 1974-02-08 1974-02-08 Hot-rolling thick steel plate on a four-high mill - using detectors to indicate start of gamma-alpha transformation Granted FR2260401A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7404222A FR2260401A1 (en) 1974-02-08 1974-02-08 Hot-rolling thick steel plate on a four-high mill - using detectors to indicate start of gamma-alpha transformation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7404222A FR2260401A1 (en) 1974-02-08 1974-02-08 Hot-rolling thick steel plate on a four-high mill - using detectors to indicate start of gamma-alpha transformation

Publications (2)

Publication Number Publication Date
FR2260401A1 true FR2260401A1 (en) 1975-09-05
FR2260401B3 FR2260401B3 (en) 1976-11-26

Family

ID=9134648

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7404222A Granted FR2260401A1 (en) 1974-02-08 1974-02-08 Hot-rolling thick steel plate on a four-high mill - using detectors to indicate start of gamma-alpha transformation

Country Status (1)

Country Link
FR (1) FR2260401A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2327824A1 (en) * 1975-10-14 1977-05-13 Sack Gmbh Maschf PROCESS AND ROLLER FOR GROWING A SLAB, PREFERABLY A SLAB MADE IN CONTINUOUS CAST, INTO A BIT WITH A SQUARE OR APPROXIMATELY SQUARE SECTION

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2327824A1 (en) * 1975-10-14 1977-05-13 Sack Gmbh Maschf PROCESS AND ROLLER FOR GROWING A SLAB, PREFERABLY A SLAB MADE IN CONTINUOUS CAST, INTO A BIT WITH A SQUARE OR APPROXIMATELY SQUARE SECTION

Also Published As

Publication number Publication date
FR2260401B3 (en) 1976-11-26

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Legal Events

Date Code Title Description
ST Notification of lapse