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WO2022057925A1 - Amélioration de la qualité de surface d'un acier à bande mince coulé à deux cylindres et laminé à chaud - Google Patents

Amélioration de la qualité de surface d'un acier à bande mince coulé à deux cylindres et laminé à chaud Download PDF

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Publication number
WO2022057925A1
WO2022057925A1 PCT/CN2021/119349 CN2021119349W WO2022057925A1 WO 2022057925 A1 WO2022057925 A1 WO 2022057925A1 CN 2021119349 W CN2021119349 W CN 2021119349W WO 2022057925 A1 WO2022057925 A1 WO 2022057925A1
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WO
WIPO (PCT)
Prior art keywords
roll
pinch roll
strip steel
pinch
cast
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.)
Ceased
Application number
PCT/CN2021/119349
Other languages
English (en)
Inventor
Aihua Chen
Hualong LI
Yixin Shi
Xinyuan Liu
Yiqing ZHAI
Dongsheng Zhou
Yujun Liu
Rongzhou WU
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.)
Zhangjiagang Zhongmei Ucs Technology Co Ltd
Jiangsu Shagang Group Co Ltd
Jiangsu Shagang Iron and Steel Research Institute Co Ltd
Original Assignee
Zhangjiagang Zhongmei Ucs Technology Co Ltd
Jiangsu Shagang Group Co Ltd
Jiangsu Shagang Iron and Steel Research Institute Co Ltd
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 Zhangjiagang Zhongmei Ucs Technology Co Ltd, Jiangsu Shagang Group Co Ltd, Jiangsu Shagang Iron and Steel Research Institute Co Ltd filed Critical Zhangjiagang Zhongmei Ucs Technology Co Ltd
Publication of WO2022057925A1 publication Critical patent/WO2022057925A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/006—Pinch roll sets
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/18—Rolls or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements

Definitions

  • the present invention relates to the field of iron and steel metallurgy casting and rolling technology for thin strip steel, and more specifically relates to improving the surface quality of cast and hot rolled thin strip steel.
  • the method according to the present invention provides an opportunity to improve surface quality of cast and hot rolled thin strip steel, eliminate pinch roll marks (i.e. black lines) on the surface of cast and hot rolled thin strip steel, improve the shape profile of cast and hot rolled thin strip steel, and minimise localised bulging of coils of cast and hot rolled thin strip.
  • the present invention relates particularly to hot rolled thin strip steel produced by a continuous twin-roll casting apparatus and a production method thereof, which includes a hot rolling step and roll stand.
  • Cast and hot rolled thin strip steel made from high strength steel and having a large width (typically 1.0-1.5 m wide) is widely used in the fields of construction, civil engineering, and transportation.
  • cast and hot rolled thin strip products are mainly produced through CSP and ESP production processes.
  • the thicknesses of casting blanks produced using such processes are less than those produced from traditional thick slabs produced using continuous slab casting and hot and cold rolling the slabs, and the final thin strip steel products can be obtained after a comparatively small amount of hot rolling to that required for cast slabs.
  • twin roll also referred to as double-roller
  • Such technology continuously casts steel into a cast strip with a thickness of less than 5 mm through a pair of casting rolls rotating in opposite directions (twin roll) and then subsequently rolls the cast strip into a hot rolled thin strip steel with a thickness of less than 1.5 mm through 1 or 2 hot-rolling passes with a relatively low roll force required to achieve the reductions, which significantly shortens the production process and reduces the production energy and cost.
  • the cast strip thicknesses produced in a twin roll casting caster are extremely thin and are reduced further with hot rolling, and thus process control during casting and hot rolling plays a particularly important role in producing required surface quality and product quality of the cast and hot rolled thin strip steel.
  • pinch roll mark also known as a surface black line
  • Pinch roll marks directly affect surface quality of the strip and have a downstream impact on the shape of a final coil of strip.
  • Pinch roll marks are generated as cast strip passes through pinch rolls upstream of a roll stand. The role of the pinch rolls is to properly align strip before the strip enters a roll stand. Pinch roll marks include, by way of example length-wise extending marks that are 20 microns or so deep indentations in the strip as a consequence of contact between strip and the pinch rolls. Pinch roll marks may be in other forms.
  • the required contact between a surface of a steel strip and pinch rolls to achieve strip alignment means that there can be differences in thermal expansion in a contact area, with thin strip steel being subjected to compressive stresses in the process of strip direction correction by the pitch rolls, and the results are (a) deviations in strip shape profile and forming pinch roll marks on a surface of strip steel and (b) a steel coil formed from the strip having localised bulges, both of which seriously affect the surface quality of the cast and hot rolled thin strip steel.
  • pinch roll marks is a unique surface quality problem of twin roll casting and rolling thin strip steel, which is quite different from the surface quality problems of a traditional slab casting and other casting production lines.
  • the applicant is not aware of an effective method to solve the pinch roll mark surface quality problem.
  • the present invention proposes a method for improving a surface quality of cast and hot rolled thin strip steel, which provides an opportunity to minimise a problem of pinch roll marks (surface black lines) that can form when twin roll casting and rolling thin strip steel, thereby improving the shape profile of cast and hot rolled thin strip steel and minimising a problem of localised bulging of hot rolled thin strip steel coils.
  • the present invention provides an opportunity to (a) improve surface quality of twin roll cast and hot rolled thin strip steel, particularly a loss of surface quality due to pinch roll marks (i.e. surface black lines) , produced by pinch rolls when twin roll casting and hot rolling thin strip steel, (b) improve the shape profile of cast and hot rolled thin strip steel, and (c) minimise localised bulging of cast and hot rolled thin strip steel coils, by any one or more than one of shape selective design of pinch rolls upstream of a hot roll stand, pinch roll body convexity design, and the amount of applied pressure to the pinch rolls during a casting and rolling operation.
  • pinch roll marks i.e. surface black lines
  • the present invention provides a method for improving a surface quality of twin roll cast and hot rolled thin strip steel, by using a pinch roll having a shape, i.e. outer profile along a length of the roll, that is designed with a quadratic curve and a sextic curve, the method comprising the following steps:
  • the coefficient A is determined according to a roll body convexity of the pinch roll
  • a pinch roll mark i.e. a black line
  • a twin roll cast and hot rolled thin strip steel is formed with a pinch roll having the quadratic curve in step 1) ;
  • the method for improving the surface quality of hot rolled thin strip steel may further comprise:
  • the roll shape equation of the sextic curve may satisfy the following parameter relationship:
  • the method may further comprise fitting the sextic curve according to a numerical value, so as to determine the coefficient of the sextic curve.
  • the coefficient A of the quadratic curve may be determined by the following formula:
  • A -4000 ⁇ C/L 2 , where C is the roll body convexity of the pinch roll.
  • the value of C of the roll body convexity of the pinch roll may be between 5 and 80 ⁇ m.
  • the region H where there is a pinch roll mark may be between 200 and 2000 mm.
  • a pressure applied to the pinch roll may be below 30kN during casting and hot rolling of thin strip steel.
  • the present invention also provides a twin roll cast and hot rolled thin strip steel produced by the above described method for improving surface quality of the cast and hot rolled thin strip steel, with at least substantially no pinch roll marks (i.e. black lines) on a surface of the cast and hot rolled thin strip steel.
  • a coiled cast and hot rolled thin strip steel produced by the above method may have at least substantially no localised bulges of the coil.
  • the present invention also provides a twin roll casting and hot rolling method of producing a thin strip steel that includes passing cast strip through a pair of pinch rolls downstream of a caster and upstream of a hot rolling mill with at least one of the pinch rolls having a roll shape formed by the above-described method.
  • the present invention also provides a twin roll casting and hot rolling apparatus for producing a thin strip steel that includes a caster, a pair of pinch rolls downstream of the caster, and a hot rolling mill downstream of the pinch rolls, wherein at least one of the pinch rolls has a roll shape formed by the above-described method.
  • the invention by designing a roll shape (i.e. a roll profile) of a pinch roll as described above, makes it possible (a) to avoid excessive local thermal expansion of the pinch roll during use, and (b) improves a shape profile of the cast and hot rolled thin strip steel. In one embodiment, this is achieved by superimposing sextic and quadratic curves and optionally controlling roll body convexity of a pinch roll and optionally controlling pressure applied to the pinch roll during use.
  • the pinch roll profile improves the performance of the pinch roll, balances the thermal expansion of the body of the pinch roll along the length of the body during use, and minimises the formation of pinch roll marks (i.e. black lines) on a surface of cast and hot rolled thin strip steel passing through the pinch roll and localised bulging on the surfaces of subsequently formed coils of strip.
  • Figure 1 is a diagrammatic side view of an embodiment of a twin roll caster that is suitable for use in the method of the invention
  • Figure 2 is an enlarged partial sectional view of a portion of the twin roll caster of Figure 1;
  • Figure 3 is a schematic view of a portion of twin roll caster of Figure 2;
  • Figure 4 is a schematic view of examples of typical pinch roll marks on a surface of a hot rolled thin strip steel produced in the twin roll casting and rolling apparatus shown in Figures 1-3;
  • Figure 5 is a schematic view of an example of a localised bulge on a surface of a twin roll cast and hot rolled thin strip steel coil.
  • Figure 6 is a surface morphology of an embodiment of a twin roll cast and hot rolled thin strip steel prepared according to an embodiment of a method of the present invention.
  • the present invention is concerned with minimising the formation of pinch roll marks and the downstream impact of the marks, for example in coils of strip.
  • Pinch roll marks are generated as cast strip passes through pinch rolls upstream of a roll stand. The role of the pinch rolls is to properly align strip before the strip enters a roll stand.
  • Pinch roll marks include, by way of example by way of example length-wise extending marks that are 20 microns or so deep indentations in the strip that form as a consequence of contact between strip and the pinch rolls.
  • pinch roll marks may be 100 m or so wide.
  • pinch roll marks are spaced outwardly from a strip centre-line and oscillate from one side to the other side of a strip as the strip passes through pinch rolls.
  • Pinch roll marks may be in other forms.
  • Figure 4 is a schematic view of the positions 1 to 3 of pinch roll marks (i.e. black lines) on a surface of a twin roll cast and hot rolled thin strip steel.
  • the pinch roll marks are in the form of elongate indentations extending along the length of the strip –shown as rectangular regions –typically 100 mm wide.
  • Figure 5 is a schematic view of a localised bulge identified by the numeral 5 on an outer surface of a coil of a cast and hot rolled thin steel strip that is the result of pinch roll marks having a localised impact on coil width at the location of the pinch roll marks.
  • the method discussed herein for improving surface quality of cast and hot rolled thin strip steel can minimise the pinch roll marks shown in Figure 4 and minimise the localised bulging shown in Figure 5.
  • a twin roll caster is illustrated that comprises a main machine frame 10 that stands up from the factory floor and supports a pair of counter-rotatable casting rolls 12 mounted in a module in a roll cassette 11.
  • the casting rolls 12 are mounted in the roll cassette 11 for ease of operation and movement as described below.
  • the roll cassette 11 facilitates rapid movement of the casting rolls 12 ready for casting from a setup position into an operative casting position as a unit in the caster, and ready removal of the casting rolls 12 from the casting position when the casting rolls 12 are to be replaced.
  • the casting apparatus for continuously casting boron-added steel strip includes the pair of counter-rotatable casting rolls 12 having casting surfaces 13 laterally positioned to form a nip 18 there between.
  • Molten steel is supplied from a ladle 13 through a metal delivery system to a metal delivery nozzle 17 (core nozzle) positioned between the casting rolls 12 above the nip 18.
  • Molten steel thus delivered forms a casting pool 19 of molten metal above the nip 18 supported on the casting surfaces 13 of the casting rolls 12.
  • This casting pool 19 is confined in the casting area at the ends of the casting rolls 12 by a pair of side closure plates, or side dams 20 (shown in dotted line in Figure 3) .
  • the upper surface of the casting pool 19 (generally referred to as the "meniscus" level) may rise above the lower end of the delivery nozzle 17 so that the lower end of the delivery nozzle 17 is immersed within the casting pool 19.
  • the casting area includes the addition of a protective atmosphere above the casting pool 19 to inhibit oxidation of the molten metal in the casting area.
  • the ladle 13 typically is of a conventional construction supported on a rotating turret 40.
  • the ladle 13 is positioned over a movable tundish 14 in the casting position to fill the tundish 14 with molten metal.
  • the movable tundish 14 may be positioned on a tundish car 66 capable of transferring the tundish 14 from a heating station (not shown) , where the tundish 14 is heated to near a casting temperature, to the casting position.
  • a tundish guide, such as rails 39, may be positioned beneath the tundish car 66 to enable moving the movable tundish 14 from the heating station to the casting position.
  • the movable tundish 14 may be fitted with a slide gate 25, actuable by a servo mechanism, to allow molten steel to flow from the tundish 14 through the slide gate 25, and then through a refractory outlet shroud 15 to a transition piece or distributor 16 in the casting position. From the distributor 16, the molten steel flows to the delivery nozzle 17 positioned between the casting rolls 12 above the nip 18.
  • the side dams 20 may be made from a refractory material such as zirconia graphite, graphite alumina, boron nitride, boron nitride zirconia, or other suitable composites.
  • the side dams 20 have a face surface capable of physical contact with the casting rolls 12 and molten metal in the casting pool 19.
  • the side dams 20 are mounted in side dam holders (not shown) , which are movable by side dam actuators (not shown) , such as a hydraulic or pneumatic cylinder, servo mechanism, or other actuator to bring the side dams 20 into engagement with the ends of the casting rolls 12. Additionally, the side dam actuators are capable of positioning the side dams 20 during casting.
  • the side dams 20 form end closures for the molten pool of steel on the casting rolls 12 during the casting operation.
  • Figure 1 shows the twin roll caster producing the cast strip 21, which passes across a guide table 30 to a pinch roll stand 31, comprising pinch rolls 31A.
  • the thin cast strip 21 may pass through a hot rolling mill 32, comprising a pair of work rolls 32A, and backup rolls 32B, forming a gap capable of hot rolling the cast strip 21 delivered from the casting rolls 12, where the cast strip 21 is hot rolled to reduce the strip to a desired thickness, improve the strip surface, and improve the strip flatness.
  • the work rolls 32A have work surfaces relating to the desired strip profile across the work rolls 32A.
  • the hot rolled cast strip 21 then passes onto a run-out table 33, where it may be cooled by contact with a coolant, such as water, supplied via water jets 90 or other suitable means, and by convection and radiation. In any event, the hot rolled cast strip 21 may then pass through a second pinch roll stand 91 to provide tension of the cast strip 21, and then to a coiler 92.
  • the cast strip 21 may be between about 1.3 and 2.0 millimeters in thickness before hot rolling.
  • a short length of imperfect strip is typically produced as casting conditions stabilize.
  • the casting rolls 12 are moved apart slightly and then brought together again to cause this leading end of the cast strip 21 to break away forming a clean head end of the following cast strip 21.
  • the imperfect material drops into a scrap receptacle 26, which is movable on a scrap receptacle guide.
  • the scrap receptacle 26 is located in a scrap receiving position beneath the caster and forms part of a sealed enclosure 27 as described below.
  • the enclosure 27 is typically water cooled.
  • a water-cooled apron 28 that normally hangs downwardly from a pivot 29 to one side in the enclosure 27 is swung into position to guide the clean end of the cast strip 21 onto the guide table 30 that feeds it to the pinch roll stand 31.
  • the apron 28 is then retracted back to its hanging position to allow the cast strip 21 to hang in a loop beneath the casting rolls 12 in enclosure 27 before it passes to the guide table 30 where it engages a succession of guide rollers.
  • An overflow container 38 may be provided beneath the movable tundish 14 to receive molten material that may spill from the tundish 14. As shown in Figure 1, the overflow container 38 may be movable on rails 39 or another guide such that the overflow container 38 may be placed beneath the movable tundish 14 as desired in casting locations. Additionally, an optional overflow container (not shown) may be provided for the distributor 16 adjacent the distributor 16.
  • the sealed enclosure 27 is formed by a number of separate wall sections that fit together at various seal connections to form a continuous enclosure wall that permits control of the atmosphere within the enclosure 27. Additionally, the scrap receptacle 26 may be capable of attaching with the enclosure 27 so that the enclosure 27 is capable of supporting a protective atmosphere immediately beneath the casting rolls 12 in the casting position.
  • the enclosure 27 includes an opening in the lower portion of the enclosure 27, lower enclosure portion 44, providing an outlet for scrap to pass from the enclosure 27 into the scrap receptacle 26 in the scrap receiving position.
  • the lower enclosure portion 44 may extend downwardly as a part of the enclosure 27, the opening being positioned above the scrap receptacle 26 in the scrap receiving position.
  • a rim portion 45 may surround the opening of the lower enclosure portion 44 and may be movably positioned above the scrap receptacle 26, capable of sealingly engaging and/or attaching to the scrap receptacle 26 in the scrap receiving position.
  • the rim portion 45 may be movable between a sealing position in which the rim portion 45 engages the scrap receptacle 26, and a clearance position in which the rim portion 45 is disengaged from the scrap receptacle 26.
  • the caster or the scrap receptacle 26 may include a lifting mechanism to raise the scrap receptacle 26 into sealing engagement with the rim portion 45 of the enclosure 27, and then lower the scrap receptacle 26 into the clearance position.
  • the enclosure 27 and scrap receptacle 26 are filled with a desired gas, such as nitrogen, to reduce the amount of oxygen in the enclosure 27 and provide a protective atmosphere for the cast strip 21.
  • the enclosure 27 may include an upper collar portion 43 supporting a protective atmosphere immediately beneath the casting rolls 12 in the casting position.
  • the upper collar portion 43 is moved to the extended position closing the space between a housing portion 53 adjacent the casting rolls 12, as shown in Figure 2, and the enclosure 27.
  • the upper collar portion 43 may be provided within or adjacent the enclosure 27 and adjacent the casting rolls 12 and may be moved by a plurality of actuators (not shown) such as servo-mechanisms, hydraulic mechanisms, pneumatic mechanisms, and rotating actuators.
  • the casting rolls 12 are internally water cooled so that as the casting rolls 12 are counter-rotated, shells solidify on the casting surfaces 13, as the casting surfaces 13 move into contact with and through the casting pool 19 with each revolution of the casting rolls 12.
  • the shells are brought close together at the nip 18 between the casting rolls 12 to produce a thin cast strip product 21 delivered downwardly from the nip 18.
  • the thin cast strip product 21 is formed from the shells at the nip 18 between the casting rolls 12 and delivered downwardly and moved downstream as described above.
  • the method of the invention is focussed on designing at least one of the pinch rolls 31A of the pinch roll stand 31 to minimise formation of pinch roll marks on steel strip passing through the pinch rolls.
  • the method comprises designing at least one of (a) a roll shape curve design for a pinch roll of a thin strip steel production line, (b) a roll body convexity design for the pinch roll, and (c) a roll pressure design to be applied during the use of the pinch roll to minimise the formation of pinch roll marks.
  • the shape curve of a body of a pinch roll is a parabola across the width of the pinch roll.
  • the method designs a sextic (i.e. 6 th order polynomial) curve design for areas of a roll body that produce pinch roll mark areas on strip steel, and this is applied in those areas of the roll body and there is a quadratic curve design for the remaining sections of the length of the roll body to form the roll shape curve across the full roll body width.
  • a sextic (i.e. 6 th order polynomial) curve design for areas of a roll body that produce pinch roll mark areas on strip steel, and this is applied in those areas of the roll body and there is a quadratic curve design for the remaining sections of the length of the roll body to form the roll shape curve across the full roll body width.
  • This embodiment which is one of many possible embodiments, includes the following steps to form a pinch roll profile on at least one pinch roll of a pair of pinch rolls that minimises the formation of pinch roll marks:
  • a curve equation for a profile, i.e. roll shape, of the pinch roll in a range of -950 ⁇ x ⁇ -500, 500 ⁇ x ⁇ 950, is determined as follows:
  • y (x) ax 6 +bx 5 +cx 4 +dx 3 +ex 2 +fx+y 0 .
  • the shape profile of strip steel is a complete quadratic curve across the strip width, except where there is a sextic curve profile across the width of the pinch roll marks ensuring that there are no pitch roll marks formed in the strip; the hot rolled thin strip steel is coiled by the coiling machine, and there is no localised bulging of the steel coil.
  • This embodiment which is also one of many possible embodiments, includes the following steps to form a pinch roll profile on at least one pinch roll of a pair of pinch rolls that minimises the formation of pinch roll marks:
  • the curve equation of roll shape of the pinch roll in a range of -1050 ⁇ x ⁇ -200, 200 ⁇ x ⁇ 1050, is determined as follows:
  • y (x) ax 6 +bx 5 +cx 4 +dx 3 +ex 2 +fx+y 0 .
  • the shape profile of strip steel is a complete quadratic curve across the strip width, except where there is a sextic curve profile across the width of the pinch roll marks ensuring that there are no pitch roll marks formed in the strip; the hot rolled thin strip steel is coiled by the coiling machine, and there is no localised bulging of the steel coil.
  • This embodiment which is also one of many possible embodiments, includes the following steps to form a pinch roll profile of at least one pinch roll of a pair of pinch rolls that minimises the formation of pinch roll marks:
  • a curve equation of roll shape of the pinch roll a range of -1150 ⁇ x ⁇ -400, 400 ⁇ x ⁇ 1150, is determined as follows:
  • y (x) ax 6 +bx 5 +cx 4 +dx 3 +ex 2 +fx+y 0 .
  • the shape profile of strip steel is a complete quadratic curve across the strip width, except where there is a sextic curve profile across the width of the pinch roll marks ensuring that there are no pitch roll marks formed in the strip; the hot rolled thin strip steel is coiled by the coiling machine, and there is no localised bulge of the steel coil.

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Abstract

L'invention divulgue un procédé d'amélioration de la qualité de surface d'un acier à bande mince coulé à deux cylindres et laminé à chaud. Le procédé comprend les étapes suivantes : (a) concevoir une courbe quadratique pour une longueur totale L d'un corps d'un rouleau pinceur; (b) déterminer une région H où des marques de rouleau pinceur sur un acier à bande mince coulé à deux cylindres et laminé à chaud sont formées avec un rouleau pinceur ayant la courbe quadratique dans l'étape (a); (c) concevoir une courbe sextique dans la région H; (d) déterminer la courbe de forme de rouleau pour la longueur totale L du corps de rouleau pinceur.
PCT/CN2021/119349 2020-09-18 2021-09-18 Amélioration de la qualité de surface d'un acier à bande mince coulé à deux cylindres et laminé à chaud Ceased WO2022057925A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010985829.7 2020-09-18
CN202010985829.7A CN112296098B (zh) 2020-09-18 2020-09-18 一种改善热轧薄带钢表面质量的方法

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WO2022057925A1 true WO2022057925A1 (fr) 2022-03-24

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Cited By (2)

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CN115659752A (zh) * 2022-11-03 2023-01-31 北京首钢冷轧薄板有限公司 工作辊辊形的设计方法、装置、介质及电子设备
CN116371942A (zh) * 2023-06-05 2023-07-04 东北大学 一种基于带钢横向强度不均的横向厚度分布预测方法

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CN112296098B (zh) * 2020-09-18 2022-08-02 江苏沙钢集团有限公司 一种改善热轧薄带钢表面质量的方法
CN113935183B (zh) * 2021-10-25 2024-12-27 江苏沙钢集团有限公司 一种改善薄带钢钢卷的边部鼓起的方法
CN118513518B (zh) * 2024-07-23 2025-01-24 张家港中美超薄带科技有限公司 一种改善薄带钢的板形耸肩缺陷的方法

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