WO2022057924A1 - Controlling surface wrinkles on thin strip produced by twin roll casting and hot rolling - Google Patents

Controlling surface wrinkles on thin strip produced by twin roll casting and hot rolling Download PDF

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Publication number
WO2022057924A1
WO2022057924A1 PCT/CN2021/119348 CN2021119348W WO2022057924A1 WO 2022057924 A1 WO2022057924 A1 WO 2022057924A1 CN 2021119348 W CN2021119348 W CN 2021119348W WO 2022057924 A1 WO2022057924 A1 WO 2022057924A1
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Prior art keywords
range
strip
cast strip
casting
controlling
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PCT/CN2021/119348
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English (en)
French (fr)
Inventor
Shujuan Zhang
Tingting Li
Xia Li
Xinyuan Liu
Hualong LI
Rongzhou WU
Xiaoxiang GU
Liangmin YUAN
Dongsheng Zhou
Yixin Shi
Original Assignee
Jiangsu Shagang Group Co., Ltd.
Institute Of Research Of Iron & Steel, Jiangsu Province/Sha-Steel, Co., Ltd.
Zhangjiagang Zhongmei Ucs Technology Co., Ltd.
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Application filed by Jiangsu Shagang Group Co., Ltd., Institute Of Research Of Iron & Steel, Jiangsu Province/Sha-Steel, Co., Ltd., Zhangjiagang Zhongmei Ucs Technology Co., Ltd. filed Critical Jiangsu Shagang Group Co., Ltd.
Publication of WO2022057924A1 publication Critical patent/WO2022057924A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • the invention relates to the technical field of iron and steel production.
  • the invention relates to a method for producing twin roll cast and hot rolled thin strip steel based, in particular to a method for controlling surface wrinkles on strip steel formed in a twin roll casting and hot rolling production process.
  • the invention relates particularly to hot rolled thin strip steel produced by a continuous twin-roll casting and hot rolling apparatus and a production method thereof.
  • Cast and hot rolled strip steel generally refers to coiled strip with a thickness of 1-20 mm, which is widely used in automobile, motor, chemical industry, shipbuilding and other industrial departments, and is also used as raw material for cold rolling, welded pipe and cold-formed steel production.
  • the traditional cast and hot rolled strip production process usually adopts a method of centering strip steel with side guide plates.
  • the known method of centering with side guide plates may lead to defects such as flanging, bending, deformation and wrinkles of strip steel, which can seriously affect the product quality.
  • the invention relates to a production method for producing cast and hot rolled thin strip steel having a thickness below 2.0 mm by using twin roll casting technology.
  • the pinch roll device described in patent CN 101198421B in which the upper and lower pinch rolls are convex rolls, can be used in the production process.
  • the research on wrinkles on the surface of strip steel in China mainly focuses on the conditions before the coiling step, especially in the situation where surface wrinkles occur before the strip steel enters a coiler, at which stage the strip steel is in an un-stretched state.
  • Patent document CN 106493172B discloses a method to solve wrinkling of thin strip steel during coiling. This method adds steering roll pre-control and other measures to a traditional automatic control method to minimize wrinkles.
  • a paper: “Formation Mechanism and Control Measures of Wrinkle Defects in Hot Rolled Strip” (Metal Materials and Metallurgical Engineering, 2011, 393, P6-9) discloses that when low carbon steel is subjected to heavy load during hot rolling, the local area of the surface produces depressions or bulges, which are called wrinkles.
  • the literature divides wrinkles into three types: (1) a first type is “straight or strip” , which occur perpendicular to a rolling direction, with some wrinkles extending the whole strip width; (2) a second type occurs when strip steel is uncoiled again; (3) a third type appears at a tail of a steel coil (inside the coil) or through a coil with a tail the most seriously affected.
  • a first solution is to uncoil the strip before deformation aging
  • a second solution is to control the deformation curvature of a steel coil
  • a third solution is to eliminate the weakening yield effect or to improve the yield strength of the low carbon steel.
  • a cast strip is hot rolled
  • wrinkles are prevented by reducing a coiling temperature to improve the yield strength of strip steel or by adding grain-refining elements such as Nb, Ti and V to improve the strength of strip steel.
  • the present invention provides an opportunity to control wrinkle formation in twin roll cast and hot rolled thin strip steel without a need for additional equipment to that usually provided and effectively minimize wrinkle formation during twin roll cast and hot rolled thin strip steel.
  • the present invention includes any one of the following technical solutions:
  • controlling the temperature of the cast strip to be in a range of 1150-1350°C, typically 1250-1350°C, such as by adjusting a speed of a casting machine to be in a range of 60-75 m/min and/or adjusting a nitrogen (N 2 ) flow rate into a hot box to be in a range of 1000-3000 m 3 /h.;
  • a contact time of a coiling guide also described as a coiling helper
  • controlling a contact time of a coiling guide to be in a range of 5-10 seconds, for example during an initial stage of coiling steel strip onto a coiler.
  • the invention adjusts any one or more of the parameters such as the convexity, thickness and temperature of the cast strip, the pressure and tension generated by the pinch rolls (upstream of a hot rolling stand) , and the contact time of a coiling guide for a coiler, thus effectively addressing one or more of the above technical problems.
  • step (iii) during a coiling step of hot rolled strip produced in step (ii) :
  • controlling a contact time of a coiling guide and the cast strip to be in a range of 5-10 seconds, for example during an initial stage of coiling steel strip onto a coiler.
  • Step 1) may further comprise adjusting a roll profile of the casting rolls and/or adjusting a casting force of the casting rolls to generate a force in a range of 4000-6000N to control the convexity of the cast strip to be in a range of 15-35 ⁇ m.
  • Step 2) may further comprise a computer system control to control the thickness of the cast strip to be in a range of 1.65-1.8 mm.
  • Step 3) may further comprise adjusting a speed of a casting machine to be in a range of 60-75 m/min and/or adjusting a nitrogen flow rate into a hot box downstream of the casting machine to be in a range of 1000-3000 m 3 /h to control the temperature of the cast strip to be in a range of 1150-1350°C, typically 1250-1350°C.
  • Step 4) may further comprise controlling a pressure applied to the pinch rolls upstream of the hot rolling step to generate a force in a range of 16kN-18kN.
  • Step 5 may further comprise controlling the tension generated in the steel strip to be in a range of 2.2MPa-2.5MPa.
  • Step 6) may further comprise controlling the contact time of the coiling guide and the cast strip to be in a range of 8-10 seconds.
  • the convexity of the cast strip may be controlled to be in a range of 30-35 ⁇ m.
  • the thickness of the cast strip may be controlled to be in a range of 1.7-1.8 mm.
  • the temperature of the cast strip may be controlled to be in a range of 1250-1300°C.
  • the pressure applied to the pinch rolls may be controlled to generate a force in a range of 16kN-18kN.
  • the tension generated in the cast strip may be controlled to be in a range of 2.2MPa-2.5Mpa.
  • the contact time of the coiling guide and the cast strip may be controlled to be in a range of 8-10 seconds.
  • the present invention also provides a hot-rolled thin strip steel, which adopts the above-described method to control wrinkles, wherein the wrinkle defective rate of the hot-rolled thin strip steel is not higher than 1.5%.
  • 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, a hot rolling mill downstream of the pinch rolls, and a coiler and a coiling guide configured to carry out the above-described method to control wrinkles.
  • the beneficial technical effects of the invention at least include:
  • the method of the invention is convenient to operate, has low process improvement cost, can improve the product qualification rate, and enables hot-rolled, thin strip steel products to have more cost advantages.
  • Figure 1 is a diagrammatic side view of an embodiment of an embodiment of an apparatus for producing twin roll cast thin steel strip that is suitable for use in the method of the invention
  • Figure 2 is an enlarged partial sectional view of a portion of a twin roll caster of the apparatus of Figure 1;
  • Figure 3 is a schematic view of a portion of the twin roll caster of Figure 2;
  • Figure 4 is a schematic diagram of another embodiment of an apparatus for producing twin roll cast thin steel strip that is suitable for use in the method of the invention.
  • Figure 5 is a schematic diagram of typical wrinkle defects described in the specification.
  • 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.
  • FIG 4 shows a schematic diagram of a second embodiment of the process and equipment for producing twin roll cast strip according to the method of the present invention.
  • the following description of the second embodiment will focus on the differences from the first embodiment shown in Figures 1, 2 and 3.
  • the second embodiment primarily differs from the first embodiment in having two coilers 192 A and 192 B, with each coiler having an associated coiling guide 193 (also described as a coil helper or a coil wrap arm) .
  • the hot rolled cast strip 121 passes through the second pinch roll stand 191 to provide tension of the cast strip 121, and then to one of the two coilers 192 A and 192 B.
  • the strip 121 is cut by shears 194 and the cut leading end of the strip 121 is then wound onto the other respective coiler 192 A, 192 B. In this manner, the coiling of the strip 121 need not be significantly interrupted during removal of completed coils.
  • the invention provides multiple options for operational parameters of a method for controlling wrinkles in the production of strip steel by twin roll casting and hot rolling steel strip.
  • the options include one or more than one of adjusting convexity, thickness and temperature of the cast strip, pressure applied to the pinch rolls, tension generated in the cast strip by the pinch rolls, contact time of the coiling guide and the like, with the result that the extent, if any, of wrinkles on the hot-rolled thin strip steel produced by twin roll casting and hot rolling process can be effectively improved.
  • Figure 5 is a schematic diagram of some examples of the wrinkle defects that may occur in the surface of thin gauge hot rolled strip 21 and which are addressed by the present invention.
  • Figure 5 illustrates two types of wrinkles: lateral wrinkles A that extend approximately perpendicular to the rolling direction, and longitudinal wrinkles B that extend approximately parallel to the rolling direction.
  • Table 1 provides the main technical parameters in each embodiment.
  • the adjusted parameters in Embodiments 1-3 are convexity, thickness and temperature of the cast strip, pressure applied to the pinch rolls, tension generated in the cast strip, and the contact time of hot rolled strip and the coiling guide of the coiler.
  • Comparative example 1 has technical parameters of producing a thin strip steel by twin roll casting in a conventional state.
  • Embodiments 1-3 will be described in more detail below.
  • the molten steel flows into the molten pool defined by the twin rolls and the side dams through a tundish.
  • the convexity of the roll profile of the twin rolls is 25 ⁇ m
  • the casting force is set at 6000N
  • the thickness of the cast strip is set at 1.65 mm.
  • the cast strip produced has a thickness of 1.65 mm and a convexity of 25 ⁇ m.
  • the speed of the casting machine is controlled at 75m/min.
  • the cast strip is transferred through a hot box containing nitrogen, and the nitrogen flow rate is controlled at 1000 m 3 /h, so that the temperature of the cast strip is 1350°C.
  • the pressure of the pinch rolls downstream of the caster is adjusted to generate a force of 16KN and the tension generated in the cast strip is 2.1MPa.
  • the cast strip is hot rolled into 0.85 mm thick rolled strip by one pass of the hot rolling mill.
  • the hot rolled strip is cooled to a process temperature by cooling water, and then enters the coiler and coiled with the coiling guide providing tension in an early stage of winding cast strip onto a drum to form a coil.
  • the contact time of the coiling guide and the cast strip is set to 5 seconds to form 0.85 mm hot rolled thin strip coil.
  • the probability of product wrinkling is 1.5%.
  • the molten steel flows into the molten pool defined by the twin rolls and the side dams through a tundish.
  • the convexity of the roll profile of the twin rolls is 30 ⁇ m
  • the casting force is set at 5000N
  • the thickness of the cast strip is set at 1.7 mm.
  • the cast strip produced has a thickness of 1.7 mm and a convexity of 30 ⁇ m.
  • the speed of the casting machine is controlled at 70m/min.
  • the cast strip is transferred through a hot box containing nitrogen, and the nitrogen flow rate is controlled at 1500 m 3 /h, so that the temperature of the cast strip is 1300°C.
  • the pressure applied to the pinch rolls downstream of the caster is adjusted to generate a force of 18KN, and the tension generated in the cast strip is adjusted to 2.2MPa.
  • the cast strip is rolled into 0.9 mm thick rolled strip by one pass of the hot rolling mill.
  • the hot rolled strip is cooled to the process temperature by cooling water, then enters the coiler and coiled with the coiling guide providing tension in an early stage of winding cast strip onto a drum to form a coil.
  • the contact time of the coiling helper is set to 8s to form 0.9 mm hot rolled thin strip coil.
  • the molten steel flows into the molten pool defined by the twin rolls and the side dams through a tundish.
  • the convexity of the roll profile of the twin rolls is 35 ⁇ m
  • the casting force is set at 4000N
  • the thickness of the cast strip is set at 1.8 mm.
  • the cast strip produced has a thickness of 0.9 mm and a convexity of 35 ⁇ m.
  • the speed of the casting machine is controlled at 60m/min.
  • the cast strip is transferred through a hot box containing nitrogen, and the nitrogen flow rate is controlled at 3000 m 3 /h, so that the temperature of the cast strip is 1250°C.
  • the pressure applied by the pinch rolls downstream of the casting machine is adjusted to generate a force of 18KN, and the tension generated in the cast strip is adjusted to 2.5MPa.
  • the cast strip is rolled into 0.9 mm thick rolled strip by one pass of the hot rolling mill.
  • the hot rolled strip is cooled to the process temperature by cooling water, then enters the coiler and coiled with the coiling guide providing tension in an early stage of winding cast strip onto a drum to form a coil.
  • the contact time of the coiling helper is set to 10s to form 0.9 mm hot rolled thin strip coil.
  • the probability of product wrinkling is 1.0%.
  • Table 2 is a summary of the specific technical effects on probability of product wrinkles under the technical parameters of Embodiments 1-3 and Comparative Examples.
  • Embodiment 1 when the convexity of cast strip is 25 ⁇ m, the thickness of cast strip is 1.65 mm, the temperature of cast strip is adjusted to 1350°C, the pressure of pinch rolls is controlled to generate a force of 16kN, the tension generated in the cast strip is controlled to 2.1 MPa, and the contact time of the coiling guide is set to 5 seconds, the wrinkle defective judgment rate of strip steel is greatly reduced to 1.5%.
  • the convexity, thickness and temperature of cast strip, pressure and tension of pinch rolls, and contact time of the coiling guide can significantly control the formation of wrinkles in the product strip steel.
  • Embodiment 2 when the convexity of cast strip is 30 ⁇ m, the thickness of cast strip is 1.70 mm, the temperature of cast strip is adjusted to 1300°C, the pressure of pinch rolls is controlled to generate a force of 18kN, the tension generated in the cast strip is controlled to 2.2MPa, and the contact time of the coiling guide is set to 8 seconds, the probability of product wrinkles in the strip steel is further reduced to 1.3%, which is superior to Embodiment 1 in terms of technical effect.
  • Embodiment 3 when the convexity of cast strip is 35 ⁇ m, the thickness of cast strip is 1.80 mm, the temperature of cast strip is adjusted to 1250°C, the pressure of pinch rolls is controlled to generate a force of 18kN, the tension generated in the cast strip are controlled to 2.5MPa, and the contact time of the coiling guide is set to 10 seconds, probability of product wrinkles in the strip steel finally drops to 1.0%, which is superior to Embodiment 1 and Embodiment 2 in terms of technical effect. It can be seen that this group of parameters adjustment is more preferable, and the probability of product wrinkles in the products is basically reduced to the minimum limit, which greatly improves the quality, and therefore profitability, of products.

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PCT/CN2021/119348 2020-09-18 2021-09-18 Controlling surface wrinkles on thin strip produced by twin roll casting and hot rolling WO2022057924A1 (en)

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CN202010988628.2A CN112296285B (zh) 2020-09-18 2020-09-18 一种改善双辊铸轧薄带褶皱的方法

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CN112296285B (zh) * 2020-09-18 2022-04-05 江苏沙钢集团有限公司 一种改善双辊铸轧薄带褶皱的方法
CN114178343B (zh) * 2021-11-17 2024-04-12 首钢智新迁安电磁材料有限公司 一种薄带钢带头卷取褶皱的控制方法
CN114260319A (zh) * 2021-12-03 2022-04-01 本钢板材股份有限公司 一种改善冷轧低碳钢卷头部褶皱缺陷的生产方法
CN115625202A (zh) * 2022-09-27 2023-01-20 张家港中美超薄带科技有限公司 一种改善热轧薄带钢的局部高点的方法
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CN115971436B (zh) * 2023-03-16 2023-05-26 张家港中美超薄带科技有限公司 一种控制薄带钢凸度的方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08187506A (ja) * 1995-01-09 1996-07-23 Nippon Steel Corp 薄肉鋳片用連続鋳造圧延設備及びブライドルロール
CN1705528A (zh) * 2002-10-15 2005-12-07 奥地利钢铁联合企业阿尔卑斯工业设备制造有限公司 用于连续生产薄钢带的方法
CN102039309A (zh) * 2009-10-23 2011-05-04 宝山钢铁股份有限公司 双辊双带复合结构薄带连铸连轧方法
CN107201478A (zh) * 2017-06-01 2017-09-26 东北大学 一种基于异径双辊薄带连铸技术的超低碳取向硅钢制备方法
CN109731913A (zh) * 2019-02-21 2019-05-10 江苏沙钢集团有限公司 一种降低双辊连铸产线轧机轧制力的方法
CN111014603A (zh) * 2019-12-30 2020-04-17 江苏沙钢集团有限公司 加硼钢的双辊铸轧生产方法
CN111151584A (zh) * 2019-12-30 2020-05-15 江苏沙钢集团有限公司 无需在线除鳞的生产高表面质量热轧带钢所需的新型热箱
CN111347031A (zh) * 2020-04-02 2020-06-30 江苏沙钢集团有限公司 一种薄带连铸用坝堰式过渡包
CN112296285A (zh) * 2020-09-18 2021-02-02 江苏沙钢集团有限公司 一种改善双辊铸轧薄带褶皱的方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100540165C (zh) * 2007-08-22 2009-09-16 马鞍山钢铁股份有限公司 一种薄板坯连铸连轧生产薄带钢卷方法
CN102796956B (zh) * 2012-08-31 2014-07-23 宝山钢铁股份有限公司 一种冷成型用高强薄带钢及其制造方法
CN105642670B (zh) * 2016-01-10 2017-09-29 东北大学 一种高硅钢的卷取式温轧装置及其方法
CN108531811B (zh) * 2018-05-16 2020-05-01 东北大学 一种铸轧trip钢薄带的制备方法
CN111215590B (zh) * 2020-04-16 2020-09-01 江苏沙钢集团有限公司 薄规格冷轧低合金高强钢及其基于双辊铸轧的生产方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08187506A (ja) * 1995-01-09 1996-07-23 Nippon Steel Corp 薄肉鋳片用連続鋳造圧延設備及びブライドルロール
CN1705528A (zh) * 2002-10-15 2005-12-07 奥地利钢铁联合企业阿尔卑斯工业设备制造有限公司 用于连续生产薄钢带的方法
CN102039309A (zh) * 2009-10-23 2011-05-04 宝山钢铁股份有限公司 双辊双带复合结构薄带连铸连轧方法
CN107201478A (zh) * 2017-06-01 2017-09-26 东北大学 一种基于异径双辊薄带连铸技术的超低碳取向硅钢制备方法
CN109731913A (zh) * 2019-02-21 2019-05-10 江苏沙钢集团有限公司 一种降低双辊连铸产线轧机轧制力的方法
CN111014603A (zh) * 2019-12-30 2020-04-17 江苏沙钢集团有限公司 加硼钢的双辊铸轧生产方法
CN111151584A (zh) * 2019-12-30 2020-05-15 江苏沙钢集团有限公司 无需在线除鳞的生产高表面质量热轧带钢所需的新型热箱
CN111347031A (zh) * 2020-04-02 2020-06-30 江苏沙钢集团有限公司 一种薄带连铸用坝堰式过渡包
CN112296285A (zh) * 2020-09-18 2021-02-02 江苏沙钢集团有限公司 一种改善双辊铸轧薄带褶皱的方法

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