EP0752286A1 - Thermal method to control the deformations of hot-rolled sections and relative device - Google Patents

Thermal method to control the deformations of hot-rolled sections and relative device Download PDF

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Publication number
EP0752286A1
EP0752286A1 EP96110287A EP96110287A EP0752286A1 EP 0752286 A1 EP0752286 A1 EP 0752286A1 EP 96110287 A EP96110287 A EP 96110287A EP 96110287 A EP96110287 A EP 96110287A EP 0752286 A1 EP0752286 A1 EP 0752286A1
Authority
EP
European Patent Office
Prior art keywords
section
cooling
fact
zone
sections
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.)
Withdrawn
Application number
EP96110287A
Other languages
German (de)
English (en)
French (fr)
Inventor
Pietro Filippi
Fausto De Marco
Gianfranco Marconi
Luca Crespan
Giuseppe Bordignon
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
Publication of EP0752286A1 publication Critical patent/EP0752286A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
    • 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
    • C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
    • C21D9/06—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails with diminished tendency to become wavy
    • 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

Definitions

  • This invention concerns a thermal method to control the deformations of hot-rolled sections and the relative device, as set forth in the respective main claims.
  • the method to control the deformations of hot-rolled sections according to the invention is applied to the field of iron and steel processing and, to be more exact, to the step of cooling long sections leaving a hot-rolling line.
  • the state of the art covers the problem that long sections, whether they be flat or have a symmetrical or asymmetrical cross-section, such as a U-shaped, V-shaped, L-shaped cross-section or another cross-section, undergo in the step of cooling downstream of the last rolling pass deformations whereby the sections leaving the cooling zone are not straight but include a curvature or twisted shape.
  • the aim is to achieve a homogeneous cooling of the section, this result being achieved by cooling the whole surface in a homogeneous manner or by cooling the surface more intensely at some tendentially hotter points.
  • the purpose of this invention is to provide a thermal method to control the deformation of hot rolled sections, whether they be flat or U-shaped, V-shaped, L-shaped sections or sections having any other cross-section.
  • the thermal method according to the invention has the purpose of preventing the occurrence of deformations in the rolled sections during the cooling step downstream of the last rolling mill stand.
  • the method according to the invention has the purpose of cooling the section in a controlled manner along at least one thin strip located at a determined position so as to obtain at the end of the cooling step a substantially straight section devoid of deformations and free of micro-structural changes which reduce the quality of the product.
  • the method according to the invention includes a controlled cooling of the section on at least one side thereof and along at least one specific line, the position of which depends on the cross-section of the section, so as to create with different cooling speeds one or more limited strips with a higher yield point which prevents possible subsequent plastic deformations.
  • This limited strip or these limited strips with a higher yield point act as a reinforcement to prevent the occurrence of further deformations downstream of the cooling zone.
  • This controlled cooling laps at least one limited strip in such a way as to maintain any stresses generated by a non-homogeneous downstream cooling of the section below the limit of elasticity of the material
  • the method according to the invention arranges to check continuously and downstream the linear condition of the section being cooled and to control in feedback the characteristics of the cooling fluid delivery means such as the position of the delivery means and/or the pressure and/or the rate of flow of the cooling fluid.
  • a line of controlled cooling is positioned parallel to the longitudinal edges of the section in a strip which extends from the longitudinal edge over about a third of the width of the section.
  • the flat section is cooled intensely along two parallel lines positioned symmetrically in relation to the plane of the longitudinal centreline of the section, each cooling line being comprised in a strip which extends from the longitudinal edge over about a third of the width of the section.
  • the cooling lines may coincide with both the outer or inner corners, or with the longitudinal edges according to various combinations.
  • the zone of controlled cooling of the sections may be one single zone or more than one, depending on the type of section.
  • the device to perform the thermal method according to the invention includes means to deliver cooling fluid which deliver a jet of cooling fluid in the form of a wall or beam with its axis parallel to the longitudinal axis of the section so that the zone lapped is limited.
  • the delivery means are able to deliver a flow of cooling fluid which laps at least a limited zone of the section in such a way as to obtain, in the material and in said zone, a higher yield point which prevents possible subsequent plastic deformations generated by stresses of a thermal type, preventing micro-structural alterations which impair the quality of the product.
  • this zone of intense cooling is arranged along a longitudinal line determined according to the type of section.
  • These cooling fluid delivery means can be moved transversely to the direction of feed of the section.
  • the transverse position of the cooling fluid delivery means is associated with monitoring means such as photoelectric cells, for instance, which check the position and the linear condition of the section and which govern a control and actuation assembly associated with the device according to the invention.
  • the transverse position of the delivery means can be adjusted continuously and advantageously automatically.
  • the device according to the invention can be fitted upstream or downstream of the assembly which shears to size and which is positioned downstream of the rolling line.
  • cooling fluid delivery means can be associated advantageously, but not necessarily, with a channel for the passage of the section.
  • the reference number 10 in the figures denotes generally a device for the controlled cooling of hot-rolled long sections 11 according to the invention.
  • the device 10 according to the invention is used to prevent the deformations of long sections 11 of any cross-section, such as flat products, angular V-shaped, L-shaped, U-shaped sections, etc. leaving a rolling line 17 upstream of a cooling plate 18.
  • the device 10 is positioned downstream of a shears 20 that shears to size.
  • the device 10 is positioned upstream of the shears 20 that shears to size.
  • the device 10 comprises in this case a channel 12 in which the section 11 is fed axially; this channel 12 includes at least two means 13 to deliver cooling fluid, respectively upper 13a and lower 13b, these means 13a, 13b being positioned respectively above and below the plane of feed of the sections 11.
  • the cooling fluid delivery means 13 deliver jets 24 of cooling fluid in the form of a wall or beam, the jets having their axes parallel to the longitudinal axis of the section 11, so that the zone of the section 11 thus lapped lies along a limited longitudinal strip of the section 11.
  • the cooling fluid delivery means 13 can be moved advantageously transversely to the channel 12 in such a manner that the jets 24 of cooling fluid always cooperate with that determined zone of the section 11, independently of the relative temporal position of that specific part of the section with respect to the feed axis, such zone where the cooling jets operate depending on the type of the section 11.
  • cooling fluid delivery means 13 can be moved transversely and are associated with respective independent actuators 16.
  • the device 10 comprises monitoring means 14, which in this case are of a photoelectric cell type and are fitted respectively at the inlet and outlet of the channel 12 so as to monitor continuously the position and linear condition of the section 11 being fed.
  • monitoring means 14 are associated with an actuation and control assembly 15, which actuates the actuators 16 for correct positioning of the cooling fluid delivery means 13 according to signals received from the monitoring means 14.
  • the actuation and control assembly 15 can also adjust the rate of flow and/or pressure of the water wall delivered by the cooling fluid delivery means 13.
  • the channel 12 includes cooling fluid delivery means 13 positioned both on the right and on the left so as to cool the flat section 11 along two parallel longitudinal lines positioned advantageously in the vicinity of the longitudinal edges of the section 11.
  • Each cooling line is advantageously included in a longitudinal strip associated with the respective longitudinal edge of the section 11 and extending transversely over about a third of the width of the section 11.
  • cooling fluid delivery means 13a and 13b are positioned so as to lap substantially the vertex 21 of the V-shaped section 11 (Fig.3b) or of the L-shaped section 11 (Fig.3a).
  • Fig.7 shows a V-shaped section 11 in which the jets 24 of cooling fluid formed as a wall or beam and produced by the delivery means 13 and referenced with the arrows 24 lap both the vertex 21 and the longitudinal edges 22 of the section 11.
  • Fig.8 shows an L-shaped section 11 with a plurality of jets 24 of cooling fluid lapping the central part and the corners 23 and the lateral edges 22 of the section 11.
  • Fig.4 shows a device 10 according to the invention in cooperation with a U-shaped section 11, in which the cooling fluid delivery means 13 are positioned so as to lap with their jets 24 of cooling fluid formed as a wall or beam the corners 23 of the "U" so as to prevent the raising of the leading and/or trailing ends of the section 11.
  • Fig.6 shows a U-shaped section 11 in which the jets 24 of cooling fluid formed as a wall applied by the delivery means 13 lap both the corners 23 and the longitudinal edges 22 of the section 11.
  • the sections 11 undergoing the thermal straightening cooperate then with a descaling means 19 located upstream of the cooling plate 18 and downstream of the device 10.
  • the descaling means 19 may be located upstream of the device 10.

Landscapes

  • 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)
EP96110287A 1995-07-07 1996-06-26 Thermal method to control the deformations of hot-rolled sections and relative device Withdrawn EP0752286A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD950136 1995-07-07
IT95UD000136A IT1280197B1 (it) 1995-07-07 1995-07-07 Procedimento termico per il controllo della deformazione di profilati laminati a caldo e relativo dispositivo

Publications (1)

Publication Number Publication Date
EP0752286A1 true EP0752286A1 (en) 1997-01-08

Family

ID=11421875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96110287A Withdrawn EP0752286A1 (en) 1995-07-07 1996-06-26 Thermal method to control the deformations of hot-rolled sections and relative device

Country Status (2)

Country Link
EP (1) EP0752286A1 (it)
IT (1) IT1280197B1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1034851A2 (en) * 1999-03-11 2000-09-13 Morgan Construction Company Rolling mill finishing section

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE896346A (fr) * 1983-03-31 1983-09-30 Ct De Res Metallurg Ct Voor Re Procede de refroidissement de produits metalliques et dispositif pour sa mise en oeuvre
JPS61150701A (ja) * 1984-12-24 1986-07-09 Nippon Steel Corp 頂角を有する形鋼の製造方法
JPS6254519A (ja) * 1985-09-03 1987-03-10 Kawasaki Steel Corp Ｈ形鋼の製造方法
JPS62174326A (ja) * 1986-01-27 1987-07-31 Kawasaki Steel Corp 形材のフランジ冷却装置
JPH04173919A (ja) * 1990-11-06 1992-06-22 Nippon Steel Corp 薄肉ウエブｈ形鋼の製造方法
JPH06170431A (ja) * 1991-03-01 1994-06-21 Nkk Corp ウェブ波のないｈ形鋼の製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE896346A (fr) * 1983-03-31 1983-09-30 Ct De Res Metallurg Ct Voor Re Procede de refroidissement de produits metalliques et dispositif pour sa mise en oeuvre
JPS61150701A (ja) * 1984-12-24 1986-07-09 Nippon Steel Corp 頂角を有する形鋼の製造方法
JPS6254519A (ja) * 1985-09-03 1987-03-10 Kawasaki Steel Corp Ｈ形鋼の製造方法
JPS62174326A (ja) * 1986-01-27 1987-07-31 Kawasaki Steel Corp 形材のフランジ冷却装置
JPH04173919A (ja) * 1990-11-06 1992-06-22 Nippon Steel Corp 薄肉ウエブｈ形鋼の製造方法
JPH06170431A (ja) * 1991-03-01 1994-06-21 Nkk Corp ウェブ波のないｈ形鋼の製造方法

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
J. DE LA HAMETTE ET AL: "A new generation of rolled structural sections", STEEL TIMES INCORPORATING IRON & STEEL, vol. 221, no. 3, REDHILL,GB, pages 125 - 126, XP000358897 *
PATENT ABSTRACTS OF JAPAN vol. 10, no. 353 (M - 539) 28 November 1986 (1986-11-28) *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 241 (M - 614) 7 August 1987 (1987-08-07) *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 22 (C - 470) 22 January 1988 (1988-01-22) *
PATENT ABSTRACTS OF JAPAN vol. 16, no. 479 (C - 0992) 6 October 1992 (1992-10-06) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 498 (M - 1675) 19 September 1994 (1994-09-19) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1034851A2 (en) * 1999-03-11 2000-09-13 Morgan Construction Company Rolling mill finishing section
EP1034851A3 (en) * 1999-03-11 2003-01-02 Morgan Construction Company Rolling mill finishing section

Also Published As

Publication number Publication date
ITUD950136A1 (it) 1997-01-07
ITUD950136A0 (it) 1995-07-07
IT1280197B1 (it) 1998-01-05

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