EP2782688B1 - Procédé de nettoyage d'une surface d'un produit en acier - Google Patents

Procédé de nettoyage d'une surface d'un produit en acier Download PDF

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Publication number
EP2782688B1
EP2782688B1 EP12788555.6A EP12788555A EP2782688B1 EP 2782688 B1 EP2782688 B1 EP 2782688B1 EP 12788555 A EP12788555 A EP 12788555A EP 2782688 B1 EP2782688 B1 EP 2782688B1
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Prior art keywords
steel product
nozzle
edge
cleaned
nozzles
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EP12788555.6A
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German (de)
English (en)
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EP2782688A1 (fr
Inventor
Eberhard Sowka
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • 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
    • B21B45/04—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 de-scaling, e.g. by brushing
    • B21B45/08—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 de-scaling, e.g. by brushing hydraulically
    • 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
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices

Definitions

  • the invention relates to a method for cleaning a surface of a steel product, wherein a jet of liquid is directed onto the surface to be cleaned from a nozzle which is located at an edge of the surface to be cleaned. During the cleaning process, a relative movement takes place between the nozzle and the steel product, and the liquid jet is oriented transversely to the direction of the relative movement of the steel product and the nozzle.
  • steel products here in particular slabs, thin slabs or flat steel products, such as thin slabs or slabs hot rolled hot strip or sheet combined, each having at least one flat, extending over the width of the respective steel product surface.
  • Methods of the type according to the invention are in particular intended for use in a so-called "cast roll mill".
  • cast roll mill In such facilities will be in a continuous molten steel, from which then thin slabs with a thickness, which is typically up to 100 mm, are divided, which are then hot rolled in a standing in line with the caster hot rolling line to a hot strip. If necessary, between their production and the hot rolling, the thin slabs pass through an oven in which they are brought to the optimal temperature for hot rolling.
  • scale particles are present on the surface of a flat steel product when entering a roll stand on the respective slab to be hot rolled, then they are introduced into the roll gap and lead to defects in the form of so-called "Tinder boat" on the surface of the obtained hot strip.
  • These scale boats are highly problematic because they are difficult to salinize, cause increased roughness on the belt surface and, if the hot strip is to be coated with a metallic corrosion preventive layer, can cause coating defects.
  • the object of the invention to provide a method for removing adhering to the surface of a steel product contaminants and oxidation products, which can be easily adapted to changed dimensions of each steel product to be cleaned and at the same time the risk of emergence of cracks at the edges of the steel product to be cleaned is minimized.
  • a liquid jet is directed onto the surface to be cleaned.
  • a relative movement between the nozzle and the steel product takes place.
  • the liquid jet is aligned transversely to the direction of the relative movement of steel product and nozzle.
  • the respective impact area in which the liquid jets strike the surface to be cleaned is at a distance from the edge which is associated with the nozzle delivering the respective liquid jet.
  • An apparatus for carrying out the method according to the invention accordingly has a nozzle for dispensing a first liquid jet assigned to an edge of the surface of the steel product to be cleaned, a second nozzle being provided for dispensing a second liquid jet directed onto the surface, the second nozzle being adjacent to the edge of the liquid jet is associated with the surface to be cleaned, which is opposite to the edge associated with the other liquid jet emitting nozzle, and wherein the nozzles are aligned such that the liquid jets they impinge meet without interference in an impact area on the surface to be cleaned of the steel product, the is spaced from the edge, which is associated with the respective liquid jet emitting nozzle.
  • the cleaning of the respective surface of the steel product is carried out by liquid jets, which are applied from opposite edges of the steel product and directed in their flow direction against each other.
  • the liquid jets are aligned so that their impact areas in the direction of relative movement overlap in a central region of the surface to be cleaned.
  • the term "transverse to the direction of relative movement” is used to describe the orientation of the liquid jets, then it is meant any orientation having a direction transverse to the direction of relative movement component, so basically each of a parallel to the direction of Relative movement deviating orientation.
  • the liquid jets can thus intersect the direction of the relative movement or aligned in the direction of relative movement straight at an angle of for example 30-90 °, wherein at one with respect to the direction of the relative movement or a correspondingly aligned straight orthogonal alignment of the liquid jets optimal cleaning results can be expected.
  • the non-overlapping alignment of the jets of fluid applied in opposite directions prevents the jets of fluid from colliding and losing kinetic energy due to a collision, which is then no longer available to remove the contaminants, oxides and deposits present on the surface to be cleaned.
  • the liquid jets are aligned in the process according to the invention so that they meet the surface to be cleaned in each case at a certain distance to the edge, which is assigned to each of them discharging nozzle.
  • the impact area of the liquid jets is accordingly offset in the direction of the respective opposite edge of the surface to be cleaned.
  • the edge region of the surface to be cleaned, which adjoins the respective nozzle associated surface edge not hit directly from the nozzle associated with this edge nozzle liquid jet, but only swept by that liquid jet, the of the opposite edge of the surface associated nozzle is discharged. Since the latter liquid jet has already traveled a greater distance on its way to the relevant edge region, it only hits the critical edge region with a lower kinetic energy.
  • the impact area of the liquid jet can be focused on the surface to be cleaned in such a way that the liquid of the liquid jet only overflows the critical area in a shooting flow, without the liquid jet directing a direct impulse to the critical edge area.
  • a less rugged cooling of the edge area is achieved so that the otherwise existing risk of stress cracking due to overcooling is minimized.
  • the liquid jets to hit with a certain distance from its edge on the surface to be cleaned and provide at least two of opposite sides and in opposite directions flowing liquid jets is that in this way without major alterations or major adjustment effort Surfaces of different widths can be cleaned with the same device operated according to the invention. It is only essential that there is a sufficient distance between the edge, which is assigned to the respective liquid jet emitting nozzle, and the impingement of the respective liquid jet, so that the critical edge edge region is not hit directly by the liquid jet.
  • the impact areas of the flowing in opposite directions, but not intersecting liquid jets on the surface to be cleaned according to the invention are aligned so that the surface to be cleaned is swept across over its entire width of liquid.
  • the liquid jets could be oriented in such a way that their impact area, viewed in their respective flow direction, begins at the center line of the surface to be cleaned.
  • the one liquid jet would cover one half and the other liquid jet the other half of the surface to be cleaned.
  • the distance KR between the beginning of the impingement of the respective liquid jet and the edge, which is associated with the respective liquid jet emitting nozzle, depending on the width B of the steel product and the width KA, over which the of the opposite edges associated with the steel product Nozzles overlap liquid jets overlap seen in the direction of relative movement estimated according to the formula KR ⁇ 0.5 x (B - KA). Due to the fact that the condition KA ⁇ B - 60 mm is maintained, the distance KR thus amounts to at least 30 mm, a sufficient distance to the respective edge is ensured.
  • the impact areas of the liquid jets overlap in the direction of relative movement over a width which corresponds to at least 20% of the distance which exists between the edges of the steel product, which are associated with the liquid jets emitting nozzles.
  • the width of the surface to be cleaned is typically in the range of 900 - 2100 mm, in particular 900-1600 mm
  • the impact areas of the liquid jets are each selected such that, viewed in the direction of relative movement, an overlap region of at least 500 mm width is established.
  • the liquid jets are directed onto the surface to be cleaned in such a way that they impart sufficient momentum over their impact area to remove the dirt present on the surface to be cleaned.
  • the liquid jets can be spread fanned over a certain spray angle range with appropriately designed commercial spray nozzles. In practice, this spray angle have proven to be between 10 ° and 45 °, preferably between 15 ° and 30 °. If the fanning out is too small, experience has shown that the impact area directly swept by the respective liquid jet is too small to reliably remove tinder particles adhering to the surface.
  • the procedure according to the invention can be used particularly advantageously for cleaning flat surfaces, as are present, for example, with cuboid steel products, in particular slabs or thin slabs, in which the surface to be cleaned extends just over the width and length of the steel product.
  • the invention is particularly suitable in a cast roll plant for cleaning during hot rolling with the work rolls of the rolling stands of the hot rolling line in Contact coming thin slab surfaces, wherein the cleaning of these surfaces according to the invention takes place before the entry of the respective thin slab in the first hot rolling mill.
  • steel products for which the invention is particularly useful are flat steel products, such as hot rolled steel strip or sheet.
  • the invention can be used, for example, following a conventional descaling or scale scrubber to gently remove after the breaking of the scale on the steel strip existing scale from the surface of the flat steel product.
  • the nozzles assigned to the edges of the surface to be cleaned, via which liquid jets are applied are arranged above the surface to be cleaned in such a way that, viewed in plan view of the surface to be cleaned, they are displaced in the direction of their associated edge, respectively sit to be cleaned surface.
  • the nozzles are arranged so that they are arranged during the cleaning process with a certain distance laterally next to their respective associated edge of the steel product to be cleaned.
  • the distance in question is advantageously dimensioned such that the width spectrum provided for the steel products to be cleaned according to the invention can pass through the device provided for carrying out the method according to the invention, without having to adapt the spacing of the nozzles.
  • the relative movement between the steel product to be cleaned and the nozzles discharging the liquid jets in accordance with the invention can be effected by moving the nozzles along their associated edges of the surface to be cleaned.
  • the nozzles are arranged stationary and the already provided movement of the steel product is used for the relative movement. Such conditions are given for example when cleaning thin slabs in the feed to the hot rolling line of a casting rolling mill.
  • An optimally uniform cleaning effect can be achieved by aligning the liquid jets, which are applied in accordance with the invention, parallel to one another.
  • the non-overlapping alignment of the liquid jets transversely to the direction of the relative movement can thereby be accomplished in a simple manner that seen in the direction of the relative movement between the nozzles and the steel product, the nozzle associated with one edge is positioned offset to the nozzle associated with the other edge.
  • the distance between the two liquid jets as well as their respective impact areas can be arbitrarily increased, whereby a mutual influence of the two liquid jets can be avoided even after their respective impact on the surface of the flat steel product.
  • nozzles directly opposite each other and to align the liquid jets they emit so that they each intersect the center line of the surface to be cleaned at an acute angle. Again, a parallel alignment of the liquid jets can be made to achieve an intense uniform cleaning effect.
  • the angle of incidence of the jets of liquid can also be influenced by the height at which the jets are arranged with respect to the surface of the flat steel product to be cleaned. The farther the nozzles are from this surface, the steeper the angle of impact of the jets of liquid. At too steep an angle of incidence of the liquid jets, however, there is a risk that they are reflected too much. Therefore, according to another practical embodiment of the invention, the respective solder spacing of the nozzles to the surface of the flat steel product to be cleaned is at most 45%, in particular at most 12.5%, of the maximum width of the flat steel product.
  • the minimum distance between the nozzles and the surface to be cleaned should be at least 20 mm in height, in particular at least 40 mm.
  • the angle of incidence of the liquid jets on the surface to be cleaned is also significantly determined by the included as an obtuse angle between a vertical and the central axis of the liquid jets angle of inclination, under which the central axis of each discharged from the nozzle liquid jets is aligned.
  • the jets should not be directed away from the surface to be cleaned.
  • the angle of inclination should also not be too great to prevent the liquid jets from hitting the surface to be cleaned at too steep an angle of impact.
  • edges of the surface to be cleaned of the steel product may be assigned to two or more nozzles, if appropriate, for example, to increase the productivity or to even out the cleaning result.
  • the inventive method is particularly suitable for use in cast rolling, strip casting or hot strip mills for cleaning slabs, thin slabs, cast strip or hot rolled steel strips ("hot strips").
  • the device 1 for cleaning a surface 2 of a cuboid thin slab 3 is arranged on a roller table 4, on which the thin slab 3 is transported, for example, to the first rolling mill of a hot rolling line, not shown here, which is part of a casting rolling plant also not shown here.
  • the thin slab 3 has, for example, a thickness D of 60 mm, a width B of 1500 mm and a length L of 40 m.
  • the surface 2 to be cleaned largely flat, is located here on the exposed upper side of the thin slab 3, which lies with its underside, which is opposite the surface 2 to be cleaned, on the rollers 5 of the roller table 2 in the conveying direction R. is moved.
  • the thin slab 3 is thus conveyed in a rectilinear relative movement along the stationarily arranged device 1.
  • the thin slab 3 is aligned substantially centrally with respect to the width B4 of the roller table 4, so that the center line M of the surface 2 to be cleaned extending in the conveying direction R of the relative movement is seen in top view under optimum operating conditions (FIG. Fig. 1 ) coincides with the center line of the roller table 4.
  • the device 1 for cleaning the surface 2 comprises two nozzles 6,7, of which one nozzle 6 on the so-called operator side 8a of the roller table 4, from which usually service work on the roller table 4 are made, and the other nozzle 7 on the so-called drive side 8b of the roller table 4 is arranged, at which the sake of clarity, not shown drives of the rollers 5 of the roller table 4 are located.
  • the nozzles 6, 7 may, for example, be conventional flat jet nozzles and flat jet tongue nozzles.
  • the liquid jets S1, S2 consist of water, which is supplied with a sufficiently high pressure via a supply device, not shown here, to the nozzles 6, 7.
  • the nozzles 6, 7 are each fastened to a frame 9, 10, via which their height h is above the surface 2 to be cleaned, the distance b to their associated edge 11, 12 of the thin slab 3 and that between the vertical V and the central one Axis A of the nozzles 6, 7 respectively discharged liquid jets S1, S2 measured inclination angle ⁇ can be adjusted.
  • the nozzles 6, 7 are respectively mounted on a horizontally oriented support arm 13, 14 of the racks 9, 10 in such a way that, as seen in the direction of conveyance R, they are arranged at a distance c offset from one another.
  • the maximum spacing of the nozzles 6, 7 is dimensioned such that the entire width spectrum in which the thin slabs can be produced in the cast rolling mill can pass through the device 1 without any fundamental modifications.
  • the nozzles 6,7 bring the liquid jets S1, S2 in the manner of a cutting knife beam such that, seen in plan view, its central axis A intersects the center line M of the surface to be cleaned 2 at a right angle and on the one hand measured in the conveying direction R width BS the liquid jets S1, S2 are each narrowly defined and, on the other hand, the liquid jets S1, S2 fan out after leaving the nozzles 6, 7 at a spray angle ⁇ .
  • the alignment of the nozzles 6, 7 and the liquid jets S1, S2 discharged by them is simultaneously selected such that the liquid jets S1, S2 meet the surface 2 of the thin slab 3 to be cleaned parallel to one another and with flow directions SR1, SR2 aligned in opposite directions.
  • the Impact areas 15, 16, in which the liquid jets S1, S2 strike the surface 2 to be cleaned, are arranged at a distance KR from the edge 11, 12 assigned to the respective liquid jet S1, S2, so that the Liquid jets S1, S2 seen in the conveying direction R ( Fig. 2 ) overlap over a width KA symmetrically oriented to the center line M, ideally.
  • the distance KR is in practice 30-200 mm, preferably 100-150 mm, to ensure that the edges on the lateral edges 11,12 of the surface 2 are not hit. In this way, a sufficient ductility of the thin slab 2 in the edge regions 15,16 is ensured to avoid edge defects during subsequent hot rolling.
  • the width KA of the overlap of the liquid jets S1, S2 should in practice be at least 250 mm in order to ensure sufficiently intensive cleaning of the center region of the surface 2 to be cleaned.
  • the spray angle ⁇ should be in the range of 10 - 45 °, in particular 10 - 30 °. If the spraying angle ⁇ is too low, the liquid jets S1, S2 strike an impinging area AB1, AB2 that is too small on impact with the surface 2 to be cleaned, so that there is no adequate cleaning or removal of loose scale particles. On the other hand, with a clear overshoot of 45 °, the spray fan is spread too much and the impulse that can be achieved due to the impingement and outflow of the liquid jet is too small for adequate cleaning.
  • this angle would be so steep in today's conventional thin slabs 3, that the respective liquid jet S1, S3 would be strongly reflected when hitting the surface 2 and no sufficient cleaning would be more.
  • a significant drop below 20 mm is not appropriate, since then there is a risk that the nozzles 6, 7 are damaged as a result of a collision with a non-centric transported over the roller table 4 thin slab 3.
  • the inclination angle ⁇ is chosen as a function of the height h such that the water fan formed from the respective liquid jet S1, S2 reliably reaches the predetermined impingement area AB1, AB2.
  • Inclination angle ⁇ well below 90 ° are usually not useful, because then shoots most of the splash water unused on the thin slab. Angle much greater than 135 ° are also not useful, because then they are so steep that the water jet could be reflected strongly when hitting the top of the slab up and no sufficient cleaning would be given.
  • the distance c of the two liquid jets S1, S2 from each other in the direction R of the relative movement is chosen so that the liquid jets do not interfere with each other.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Metal Rolling (AREA)

Claims (11)

  1. Procédé de nettoyage d'une surface d'un produit en acier (3), dans lequel un jet de liquide (S1), en provenance d'une buse (6), qui se trouve dans une position associée à un bord (11) de la surface à nettoyer (2), est dirigé sur ladite surface à nettoyer (2), dans lequel, pendant le processus de nettoyage, a lieu un déplacement relatif entre la buse (6) et le produit en acier (3), et dans lequel la jet de liquide (S1) est dirigé transversalement par rapport à la direction (R) du déplacement relatif du produit en acier (3) et de la buse (6),
    - sachant que, partant d*une autre buse (7), qui se trouve dans une position associée au bord (12) de la surface à nettoyer (2), qui est situé à l'opposé du bord (11) du produit en acier (3), associé à la première buse (6), un autre jet de liquide (S2), orienté transversalement par rapport à la direction (R) du déplacement relatif entre les buses (6, 7) et le produit en acier (3), est dirigé sur la surface à nettoyer (2), sans croisement par rapport au premier jet de liquide (S1),
    - sachant que chaque région d'impact (AB1, AB2) des jets de liquide (S1, S2) sur la surface à nettoyer (2) est distancée du bord (11, 12) respectivement associé à la buse (6, 7) qui éjecte le jet de liquide (S1, S2) respectif, et
    - sachant que, vue dans la direction d'écoulement (SR1, SR2) du jet de liquide (S1, S2) respectif, chacune des régions d'impact (AB1, AB2) des jets de liquide (S1, S2) commence respectivement entre la ligne centrale (M) de la surface à nettoyer (2) du produit en acier (3) et le bord (11, 12) du produit en acier (3) qui est associé à la buse (6, 7) qui éjecte le jet de liquide (S1, S2) respectif,
    caractérisé en ce que l'intervalle (KR), entre le début de la région d'impact (AB1, AB2) de chacun des jets de liquide (S1, S2) et le bord (11, 12) auquel est associée la buse respective (6, 7), qui éjecte le jet de liquide (S1, S2), est réglé en fonction de la largeur (B) du produit en acier (3) et la largeur (KA) sur laquelle les jets de liquide (S1, S2), respectivement éjectés par les buses (6, 7), associées aux bord (11, 12) du produit en acier (3) opposés l'un à l'autre, se chevauchent, vus dans la direction (R) du déplacement relatif, le réglage s'effectuant selon la formule suivante : KR ≥ 0 , 5 x B - KA .
    Figure imgb0003
  2. Procédé selon la revendication 1,
    caractérisé en ce que l'intervalle (KR), entre le début de la région d'impact (AB1, AB2) de chacun des jets de liquide (S1, S2) et le bord (11, 12) qui est associée à la buse respective (6, 7), qui éjecte le jet de liquide (S1, S2), est d'au moins 30 mm .
  3. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que, vues dans la direction (R) du déplacement relatif, les régions d'impact (AB1, AB2) des jets de liquide (S1, S2) se chevauchent sur une largeur (KA) qui correspond au moins à 20 % de l'intervalle (B) qui existe entre les bords (11, 12) du produit en acier (3), respectivement associés aux buses (6, 7) qui éjectent les jets de liquide (S1, S2).
  4. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que l'angle d'éjection (γ), sous lequel chaque jet de liquide (S1, S2) se répand après sa sortie de la buse (6, 7), est de 10° - 45°.
  5. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que l'angle d'inclinaison (Θ), formé en tant qu'angle obtus entre une verticale et l'axe central (A) des jets de liquide (S1, S2), est de > 90° - 135°.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que le produit en acier (3) présente la forme d'un quadrilatère et que la surface à nettoyer (2) s'étend à plat sur la largeur et la longueur du produit en acier (3).
  7. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que les buses (6, 7), qui éjectent les jets de liquide (S1, S2), sont disposées chacune sur latéralement par rapport au produit en acier (3) et à distance du bord (11, 12) du produit en acier (3) qui leur est respectivement associé.
  8. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que, vue dans la direction (R) du déplacement relatif entre les buses (6, 7) et le produit en acier (3), la buse (6), associée à l'un des bords (11), est positionnée en étant décalée par rapport à la buse (7) associée à l'autre bord (12).
  9. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que les buses (6, 7) sont installées fixement et que le produit en acier (3) est déplacé sur une voie de transport (4) par rapport aux buses (6, 7).
  10. Procédé selon l'une des revendications précédentes,
    caractérisé en ce qu' au moins le jet de liquide (S1, S2) appliqué par l'une des buses (6, 7) est orienté orthogonalement par rapport à la direction (R) du déplacement relatif entre le produit en acier (3) et les buses (6, 7).
  11. Procédé selon l'une des revendications précédentes,
    caractérisé en ce qu' il est utilisé dans les installations de coulée de bandes, les installations de coulée et laminage ou de feuillards laminés à chaud pour le nettoyage de brames, de brames minces, de bande coulée ou de bande d'acier laminés à chaud.
EP12788555.6A 2011-11-25 2012-11-22 Procédé de nettoyage d'une surface d'un produit en acier Active EP2782688B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011119334A DE102011119334A1 (de) 2011-11-25 2011-11-25 Verfahren und Vorrichtung zum Reinigen einer Oberfläche eines Stahlprodukts
PCT/EP2012/073332 WO2013076187A1 (fr) 2011-11-25 2012-11-22 Procédé et dispositif de nettoyage d'une surface d'un produit en acier

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EP2782688A1 EP2782688A1 (fr) 2014-10-01
EP2782688B1 true EP2782688B1 (fr) 2015-09-16

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US (1) US20140290704A1 (fr)
EP (1) EP2782688B1 (fr)
CN (1) CN104066524B (fr)
DE (1) DE102011119334A1 (fr)
ES (1) ES2556038T3 (fr)
WO (1) WO2013076187A1 (fr)

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CN100430163C (zh) * 2006-09-30 2008-11-05 南京钢铁股份有限公司 高强度低合金钢轧后层流冷却水的侧喷吹扫系统
CN201346566Y (zh) * 2008-12-29 2009-11-18 中冶南方工程技术有限公司 中厚钢板控制冷却侧喷系统
CN102248012B (zh) * 2011-07-26 2013-05-08 杨海西 用于线材热轧过程的冷却装置和冷却方法

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CN104066524B (zh) 2016-08-24
EP2782688A1 (fr) 2014-10-01
ES2556038T3 (es) 2016-01-12

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