BE896219A - Cooling of hot rolled profiles - controlled to avoid profile distortion - Google Patents

Cooling of hot rolled profiles - controlled to avoid profile distortion Download PDF

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Publication number
BE896219A
BE896219A BE6/47796A BE896219A BE896219A BE 896219 A BE896219 A BE 896219A BE 6/47796 A BE6/47796 A BE 6/47796A BE 896219 A BE896219 A BE 896219A BE 896219 A BE896219 A BE 896219A
Authority
BE
Belgium
Prior art keywords
cooling
profile
coolant
intense
subjected
Prior art date
Application number
BE6/47796A
Other languages
French (fr)
Original Assignee
Centre Rech Metallurgique
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 Centre Rech Metallurgique filed Critical Centre Rech Metallurgique
Priority to BE6/47796A priority Critical patent/BE896219A/en
Publication of BE896219A publication Critical patent/BE896219A/en

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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • 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
    • B21B45/02—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 for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

Profiles, leaving a hot rolling mill, are subjected to selective cooling so that junction zone of the profiles are cooled more intensely, pref. by means of water sprays. The method is used esp. for cooling I-beams on cooling beds and avoids formation of thermal gradient, which cause deformation of the beams, by more intense cooling of the junction zones which normally cool more slowly than the beam flanges.

Description

       

  Perfectionnement au procédé de refroidissement des profilés.

  
La présente invention concerne le refroidissement des profilés, après la sortie du laminoir, par exemple sur le refroidissoir.

  
Elle s'applique en particulier aux profilés qui, en raison de la forme de leur section, sont susceptibles de se déformer sous l'effet de contraintes thermiques développées au cours du refroidissement. C'est le cas notamment des poutrelles I, auxquelles se réfère plus particulièrement la description qui va suivre.

  
On sait que les poutrelles laminées ont une longueur pouvant atteindre plusieurs dizaines de mètres. Elles sont débitées en tronçons dont la longueur n'excède généralement pas cinq à six mètres, puis elles sont déposées sur un refroidissoir sur lequel leur température passe de 1000[deg.]C à 100[deg.]C environ  Revendications.

  
1. Procédé de refroidissement d'un profilé, dans lequel on dépose sur un refroidissoir, le profilé sortant du laminoir à chaud, caractérisé en ce que l'on soumet le dit profilé à un refroidissement sélectif, ce refroidissement étant plus intense dans les zones de jonction des éléments constituant le profilé que dans les éléments proprement dits.



  Improvement to the profile cooling process.

  
The present invention relates to the cooling of the profiles, after leaving the rolling mill, for example on the cooler.

  
It applies in particular to profiles which, due to the shape of their section, are liable to deform under the effect of thermal stresses developed during cooling. This is the case in particular of the beams I, to which the description which follows more particularly refers.

  
We know that laminated beams have a length of up to several tens of meters. They are cut into sections the length of which generally does not exceed five to six meters, then they are placed on a cooler on which their temperature goes from 1000 [deg.] C to 100 [deg.] C approximately Claims.

  
1. Method for cooling a profile, in which the profile leaving the hot rolling mill is deposited on a cooler, characterized in that said profile is subjected to selective cooling, this cooling being more intense in the areas of junction of the elements constituting the profile only in the elements themselves.

Claims (1)

2. Procédé suivant la revendication 1, caractérisé en ce que l'on soumet au moins une des dites zones de jonction, à l'action de jets d'agent réfrigérant. 2. Method according to claim 1, characterized in that at least one of said junction zones is subjected to the action of jets of coolant. 3. Procédé suivant la revendication 2, caractérisé en ce que l'on utilise comme agent réfrigérant de l'eau tenant éventuellement en solution et/ou en suspension, une ou plusieurs substances améliorant les échanges thermiques. 3. Method according to claim 2, characterized in that one uses as water coolant optionally holding in solution and / or in suspension, one or more substances improving heat exchange. 4. Procédé suivant l'une ou l'autre des revendications 2 et 3, caractérisé en ce que l'on utilise comme agent réfrigérant un brouillard d'eau. 4. Method according to either of Claims 2 and 3, characterized in that a mist of water is used as the coolant. 5. Procédé suivant l'une ou l'autre des revendications 2 à 4, caractérisé en ce que l'on fait varier le débit d'agent réfrigérant et la durée du refroidissement intense, en fonction des dimensions et/ou de la température du profilé. 5. Method according to either of claims 2 to 4, characterized in that the refrigerant flow rate and the duration of the intense cooling are varied, depending on the dimensions and / or the temperature of the streamlined. 6. Procédé suivant l'une ou l'autre des revendications 1 à 5, caractérisé en ce que l'on règle le refroidissement intense séparément dans chacune des dites zones de jonction, en fonction de ses dimensions et/ou de sa température propres. Lors de cette opération, ces tronçons de poutrelle se déforment de façon sensible, sous l'action des contraintes internes développées au cours du refroidissement. Dans certains cas, la flèche de la poutrelle ainsi déformée peut atteindre 20 cm. 6. Method according to either of claims 1 to 5, characterized in that the intense cooling is regulated separately in each of said junction zones, according to its dimensions and / or its own temperature. During this operation, these sections of beam are deformed significantly, under the action of internal stresses developed during cooling. In some cases, the deflection of the beam thus deformed can reach 20 cm. Pour supprimer cette déformation, la poutrelle est ensuite soumise à une opération de dressage, au cours de laquelle elle retrouve la forme rectiligne habituellement exigée pour sa mise To remove this deformation, the beam is then subjected to a straightening operation, during which it regains the straight shape usually required for its setting en oeuvre. in action. Cette opération de dressage nécessite cependant une installation et un temps de traitement assez important, ce qui influence défavorablement le prix de revient de la poutrelle, et plus généralement du profilé. This dressing operation, however, requires a fairly large installation and processing time, which adversely affects the cost price of the beam, and more generally of the profile. Le Demandeur a constaté que, dans les zones de jonction des différents éléments constituant le profilé, en particulier l'âme et les ailes, la vitesse de refroidissement naturel était plus faible que dans les éléments, par exemple les ailes, proprement dits. The Applicant has found that, in the areas of junction of the various elements constituting the profile, in particular the core and the wings, the natural cooling rate was lower than in the elements, for example the wings, proper. Cette différence de vitesse de refroidissement donne naissance This difference in cooling rate gives birth à des gradients thermiques qui induisent les contraintes thermiques entraînant les déformations constatées. to thermal gradients which induce thermal stresses causing the observed deformations. La présente invention a pour objet un procédé de refroidissement d'un profilé, permettant de réduire ou de supprimer toute déformation et par conséquent de rendre inutile toute opération de dressage du profilé après le refroidissement. The subject of the present invention is a method of cooling a profile, making it possible to reduce or eliminate any deformation and consequently to make any operation of straightening the profile unnecessary after cooling. Le procédé de refroidissement d'un profilé qui fait l'objet de la présente invention, dans lequel le profilé sortant du laminoir à chaud est déposé sur un refroidissoir, est essentielle- ment caractérisé en ce que l'on soumet le profilé à un refroidissement sélectif, ce refroidissement étant plus intense dans les zones de jonction des éléments constituant le profilé que dans ces éléments proprement dits. The process for cooling a profile which is the subject of the present invention, in which the profile leaving the hot rolling mill is deposited on a cooler, is essentially characterized in that the profile is subjected to cooling. selective, this cooling being more intense in the junction zones of the elements constituting the profile than in these elements proper. Selon une mise en oeuvre particulièrement intéressante, on soumet les dites zones de jonction des éléments constituant le profilé à l'action de jets d'agent réfrigérant. According to a particularly advantageous implementation, said junction zones of the elements constituting the profile are subjected to the action of jets of coolant. Selon une première variante du procédé de l'invention, on utilise comme agent réfrigérant de l'eau, tenant éventuellement en solution et/ou en suspension une ou plusieurs substances améliorant les échanges thermiques. According to a first variant of the process of the invention, water is used as the coolant, optionally holding in solution and / or in suspension one or more substances improving heat exchange. Selon une autre variante intéressante, on utilise comme agent réfrigérant un brouillard d'eau. According to another interesting variant, a water mist is used as the coolant. Il s'est avéré très intéressant, selon l'invention, de faire vavarier le débit de l'agent réfrigérant et la durée du refroidissement intense, en fonction des dimensions et de la température du profilé. It has been found very advantageous, according to the invention, to vary the flow rate of the refrigerant and the duration of the intense cooling, as a function of the dimensions and the temperature of the profile. Egalement selon l'invention, il a été trouvé avantageux de régler le refroidissement intense séparément dans chacune des zones de jonction d'au moins deux éléments constituant le profilé. Also according to the invention, it has been found advantageous to regulate the intense cooling separately in each of the joining zones of at least two elements constituting the profile. Le procédé de l'invention permet de compenser la différence de vitesse de refroidissement naturel entre les dites zones de jonction des éléments constituant le profilé et les éléments proprement dits, qui est due à la différence de quantité de chaleur et de surface de refroidissement entre les diverses zones du profilé.//^ The method of the invention makes it possible to compensate for the difference in natural cooling speed between the said junction zones of the elements constituting the profile and the elements proper, which is due to the difference in the amount of heat and the cooling surface between the various sections of the profile .//^
BE6/47796A 1983-03-18 1983-03-18 Cooling of hot rolled profiles - controlled to avoid profile distortion BE896219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE6/47796A BE896219A (en) 1983-03-18 1983-03-18 Cooling of hot rolled profiles - controlled to avoid profile distortion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE6/47796A BE896219A (en) 1983-03-18 1983-03-18 Cooling of hot rolled profiles - controlled to avoid profile distortion

Publications (1)

Publication Number Publication Date
BE896219A true BE896219A (en) 1983-09-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0794022A3 (en) * 1996-03-08 1998-02-04 Sms Schloemann-Siemag Aktiengesellschaft Method, device and cooling medium for the cooling of profiles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0794022A3 (en) * 1996-03-08 1998-02-04 Sms Schloemann-Siemag Aktiengesellschaft Method, device and cooling medium for the cooling of profiles
US5775122A (en) * 1996-03-08 1998-07-07 Sms Schloemann-Siemag Ag Method of and apparatus for cooling hot-rolled structural shapes

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Date Code Title Description
RE Patent lapsed

Owner name: CENTRE DE RECHERCHES METALLURGIQUES - CENTRUM VOO

Effective date: 19850318