WO2020030040A1 - Production d'une bande d'acier coulée entre cylindres et laminée à chaud - Google Patents

Production d'une bande d'acier coulée entre cylindres et laminée à chaud Download PDF

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Publication number
WO2020030040A1
WO2020030040A1 PCT/CN2019/099764 CN2019099764W WO2020030040A1 WO 2020030040 A1 WO2020030040 A1 WO 2020030040A1 CN 2019099764 W CN2019099764 W CN 2019099764W WO 2020030040 A1 WO2020030040 A1 WO 2020030040A1
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WO
WIPO (PCT)
Prior art keywords
strip
steel strip
hot
steel
cast
Prior art date
Application number
PCT/CN2019/099764
Other languages
English (en)
Inventor
Hualong LI
Tingting Li
Aihua Chen
Yixin Shi
Jian Liu
Yi Ma
Dongsheng Zhou
Xinyuan Liu
Xia Li
Yihai ZHU
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.
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 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 WO2020030040A1 publication Critical patent/WO2020030040A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C21D8/0215—Rapid solidification; Thin strip casting
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

Definitions

  • the invention relates to an easy-to-weld twin-roll cast and hot rolled steel strip and its manufacturing method.
  • the invention relates particularly, although by no means exclusively, to an easy-to-weld twin-roll cast and hot rolled Q345 steel strip and its manufacturing method.
  • Twin-roll casting technology is a comparatively new technology that is an opportunity for sustainable development of the steel industry because it has a short process, low energy consumption, low capital and operating investment, and green environmental credentials.
  • molten metal typically steel
  • a twin roll caster molten metal, typically steel, is introduced between a pair of counter-rotated casting rolls that are cooled so that metal shells solidify on the moving roll surfaces and are brought together at a nip between them.
  • the term "nip" is used herein to refer to the general region at which the rolls are closest together.
  • the molten metal may be delivered from a ladle into a smaller vessel or series of smaller vessels from which it flows through a metal delivery nozzle located above the nip, forming a casting pool of molten metal supported on the casting surfaces of the rolls immediately above the nip and extending along the length of the nip.
  • a thin metal strip is cast downwardly from the nip.
  • the applicant has calculated that the energy consumption of the hot-rolled strip coil by a twin-roll casting process is 16%of the thick slab casting process, 32%of the thin slab casting process, 45.5%of the ESP process, and the CO 2 emissions are 24.9%of the thick slab process, 44.4%of the thin slab process, 33.7%of the ESP process, the fuel consumption is reduced by 95%, the water consumption is reduced by 80%, and the energy saving and environmental protection effect is remarkable.
  • Steel Q345 is a typical low-alloy steel in China. It is the most widely and largely used structural steel in China. It needs to exhibit high and stable tensile strength and excellent welding performance to meet product specifications.
  • the conventional Q345 steel strip manufacturing method is based on a medium-low carbon and high manganese steel composition, with a C content of between 0.1%and 0.2%, and a manganese content of between 0.75%and 1.2%.
  • the conventional Q345 steel strip Due to the high C content and C equivalent, the conventional Q345 steel strip has poor welding performance.
  • the invention provides an easy-to-weld hot-rolled steel strip, such as Q345 steel strip, produced by twin-roll casting Q345 steel strip and hot rolling the cast strip.
  • the easy-to-weld twin-rolled cast and hot-rolled steel strip such as Q345 steel strip may have a chemical composition by mass percentage that includes:
  • an appropriate amount or amounts of one or more than one of alloying elements such as Cr, V, and Ti may be added to the steel composition, such as the Q345 steel composition, in a total amount by mass percentage that does not exceed 2%.
  • the steel composition may include other elements in addition to those mentioned above.
  • the other elements may include any one or more of the elements Cu, Ni, and Mo.
  • an element mentioned in the two preceding paragraphs may be an inevitable impurity and in other situations the same element may be a deliberate addition. This depends of factors such as the feed materials for the steel production step 1) and on the required mechanicla properties of the easy-to-weld twin-rolled cast and hot-rolled steel strip.
  • the steel composition such as Q345 steel composition, may have a carbon equivalent Ceq value of less than 0.178 and a cold crack sensitivity index Pcm value of less than 0.095.
  • the invention also provides a method of manufacturing an easy-to-weld Q345 steel strip comprising the steps of:
  • step 2) hot rolling the cast strip in step 2) ;
  • the molten steel in steel production step 1) may be obtained by electric furnace steelmaking, vacuum tank degassing, and LF refining.
  • the pouring temperature of molten steel in twin roll casting step 2) may be 1500-1600°C.
  • the casting speed in twin roll casting step 2) may be 20-120m/min.
  • the molten steel may be twin roll cast in twin roll casting step 2) under inert gas protection.
  • the cast strip produced in twin roll casting step 2) may have a thickness of 1.4-2.5mm.
  • the hot rolling step 3) may be a one pass hot rolling step with a reduction of 10-50%.
  • the hot rolling temperature may be 850-1050°C.
  • the cooling step 4) cools the hot rolled cast strip to 400-600°C at a cooling rate of 30-80°C/s.
  • the cooling step may be carried out using any suitable cooling options, such as water sprays or water mist jets.
  • the coiling step 5 coils the cooled hot-rolled cast strip at a temperature of 400-600°C and allows the cast strip to cool to room temperature in a coil.
  • the steel strip, such as Q345 steel strip, produced by the method may have a yield strength of ⁇ 380MPa.
  • the steel strip, such as Q345 steel strip, produced by the method may have a tensile strength of ⁇ 520 MPa, typically 520-590 MPa.
  • the steel strip, such as Q345 steel strip, produced by the method may have an elongation of ⁇ 20%.
  • composition of the steel strip such as Q345 steel strip, may have a carbon equivalent Ceq value of less than 0.178.
  • composition of the steel strip such as Q345 steel strip, may have a cold crack sensitivity index Pcm value of less than 0.095.
  • Ceq (%) C + Mn/6 + (Cr + Mo + V) /5 + (Ni + Cu) /15
  • Pcm (%) C + Si/30 + Mn/20 + Cu/20 + Ni/60 + Cr/20 + Mo/15 + V/10 + 5B
  • the beneficial technical effects obtained by the invention include, for example:
  • the twin-roll casting and hot rolling method of the invention makes it possible to produce steel strip, such as Q345 steel strip, with few production steps, significantly reduced production cost and labor costs.
  • the steel strip, such as Q345 steel strip, of the invention has the advantages of thin thickness and high strength and can replace the traditional thick-type high-strength hot-rolled steel strip products, thereby achieving the effects of reducing cost, energy saving and environmental protection.
  • the steel strip of the invention has an ultra-low carbon and low-manganese steel composition and consequently has better welding performance.
  • the main alloying elements in conventional Q345 steel strip are: C: 0.1-0.2%; Si: 0.15 ⁇ 0.5%; Mn: 0.75 ⁇ 1.2%. With this composition range, the carbon equivalent Ceq value is 0.23 ⁇ 0.33 and the cold crack sensitivity index Pcm value is 0.143-0.21.
  • the carbon equivalent Ceq value of Q345 steel strip in a comparative example of the invention is no more than 0.178 and the cold crack sensitivity index Pcm value is no more than 0.095. It is clear from this data that the steel strip, such as Q345 steel strip, of the invention has better welding performance.
  • the composition of the steel strip, such as Q345 steel strip, of the invention may be modified to compensate for a reduction in strength due to the reduced content of manganese by adding Nb or any other suitable elements, typically in small concentrations to the steel composition.
  • Nb may also have a beneficial impact of refining and homogenizing the steel strip, such as Q345 steel strip, and effectively improve the comprehensive mechanical properties of the steel strip as a consequence of Nb microalloy precipitates.
  • the microstructure of the steel strip such as Q345 steel strip of the invention may be irregular equiaxed ferrite and acicular ferrite.
  • FIG. 1 is an elevational side view of an exemplary strip caster for use with the disclosed methods
  • FIG. 2 is an enlarged partial sectional view of a portion of the twin roll caster of FIG. 1;
  • FIG. 2A is a schematic view of a portion of twin roll casters of FIG. 2;
  • FIG. 3 is a photograph of the microstructure of Q345 steel strip obtained in embodiment 1 of the invention.
  • an embodiment of the invention is an easy-to-weld twin roll cast and hot-rolled steel strip, such as a Q345 steel strip, having a chemical composition by mass percentage that includes: C: ⁇ 0.05%; Si: 0.15 ⁇ 0.3%; Mn: ⁇ 0.7%; Nb: ⁇ 0.04%; P: ⁇ 0.03%; S: ⁇ 0.003%; N: ⁇ 0.005%; and balance being Fe and inevitable impurities.
  • the steel composition may include other elements in addition to those mentioned above.
  • the other elements may include any one or more of the elements Cr, V, Ti, Cu, Ni, and Mo. In some situations, these other elements may be an inevitable impurity and in other situations the same element or elements may be a deliberate addition. This depends of factors such as the feed materials for the steel production step 1) and on the required mechanicla properties of the easy-to-weld twin-rolled cast and hot-rolled steel strip.
  • an embodiment of the invention is a method of manufacturing an easy-to-weld steel strip, such as a Q345 steel strip, comprising the steps of:
  • step 2) hot rolling the cast strip formed in step 2) and forming a hot rolled steel strip;
  • Molten steel having the following composition is obtained by electric furnace steelmaking, vacuum tank degassing, LF refining according to mass percentage: C: 0.024%; Si: 0.28%; Mn: 0.6%; Nb: 0.023%; P: 0.01%; S: 0.002%; N: 0.003%; and balance being Fe and inevitable impurities.
  • Hot rolling The cast strip is hot rolled into a strip with a thickness of 1.8mm by means of a one pass hot rolling stand with a reduction of 18%at a hot rolling temperature is 1050°C.
  • the hot-rolled strip is cooled to 600°C at a cooling rate of 40°C/sand then coiled at temperature and allowed to cool to room temperature.
  • FIG. 3 is a photograph of the metallographic structure of Q345 obtained in Embodiment 1.
  • the microstructure shown in FIG 3 comprises irregular equiaxed ferrite and acicular ferrite.
  • Molten steel having the following composition is obtained by electric furnace steelmaking, vacuum tank degassing, LF refining according to mass percentage: C: 0.03%; Si: 0.23%; Mn: 0.52%; Nb: 0.025%; P: 0.012%; S: 0.0018%; N: 0.0038%; and balance being Fe and inevitable impurities.
  • Hot rolling The cast strip is rolled into a strip with a thickness of 1.2mm by means of a one pass of hot rolling stand with a reduction of 33%and a hot rolling temperature of 950°C.
  • the hot-rolled strip is cooled to 500°C at a cooling rate of 55°C/sand then coiled at temperature and allowed to cool to room temperature.
  • Molten steel having the following composition is obtained by electric furnace steelmaking, vacuum tank degassing, LF refining according to mass percentage: C: 0.037%; Si: 0.18%; Mn: 0.35%; Nb: 0.032%; P: 0.008%; S: 0.001%; N: 0.0023%; and balance being Fe and inevitable impurities.
  • Hot rolling The cast strip is rolled into a strip with a thickness of 0.8mm by means of a one pass of hot rolling stand with a reduction of 47%at a hot rolling temperature is 850°C.
  • the hot-rolled strip is cooled to 400°C at a cooling rate of 65°C/sand then coiled at temperature and allowed to cool to room temperature.
  • FIGS. 1, 2, and 2A an exemplary thin strip caster is shown in FIGS. 1, 2, and 2A, the exemplary thin strip caster forming a twin roll caster.
  • the twin roll caster has a main machine frame 10 standing 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.
  • There is no particular configuration of the roll cassette 11 that is desired, so long as it performs that function of facilitating movement and positioning of the casting rolls 12 as described herein.
  • the casting apparatus for continuously casting thin steel strip includes the pair of counter-rotatable casting rolls 12 having casting surfaces 12A laterally positioned to form a nip 18 there between.
  • Molten metal 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 metal thus delivered forms a casting pool 19 of molten metal above the nip 18 supported on the casting surfaces 12A 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 FIG. 2A) .
  • 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 casting rolls 12 are internally water cooled so that as the casting rolls 12 are counter-rotated, shells solidify on the casting surfaces 12A, as the casting surfaces 12A 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.
  • the ladle 13 of FIG. 1 may be 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, where the tundish 14 is heated to near a casting temperature, to the casting position.
  • a tundish guide such as rails, 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 metal 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 metal 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, which are movable by side dam actuators, 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 metal on the casting rolls 12 during the casting operation.
  • FIGS 1 and 2A show 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 passes 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.
  • a coolant such as water
  • the hot rolled cast strip 21 may then pass through a second pinch roll stand 91 having roller 91A to provide tension of the cast strip 21, and then to a coiler 92.
  • the cast strip 21 may be 0.3 to 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 FIG. 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 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.
  • 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 FIG. 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 such as servo-mechanisms, hydraulic mechanisms, pneumatic mechanisms, and rotating actuators.
  • the casting rolls 12 are internally water cooled as described below so that as the casting rolls 12 are counter-rotated, shells solidify on the casting surfaces 12A, as the casting surfaces 12A 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.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une bande d'acier coulée entre cylindres et laminée à chaud facile à souder, telle qu'une bande d'acier Q345, ayant une composition chimique constituée, en pourcentage en masse, de : 0,05 % ou moins de C ; 0,15 à 0,3 % de Si ; 0,7 % ou moins de Mn ; 0,04 % ou moins de Nb ; 0,03 % ou moins de P ; 0,003 % ou moins de S ; 0,005 % ou moins de N, le reste étant du fer et des impuretés inévitables. Le procédé comprend la coulée entre cylindres de l'acier fondu et la formation d'une bande coulée ayant une épaisseur de 1,4 à 2,5 mm, le laminage à chaud de la bande coulée et la formation d'une bande laminée à chaud ayant une épaisseur de 0,7 à 1,9 mm par une étape de laminage à chaud à une passe, le refroidissement de la bande laminée à chaud jusqu'à une température de 400 à 600 °C à une vitesse de refroidissement de 30 à 80 °C/s, et l'enroulement de la bande laminée à chaud refroidie.
PCT/CN2019/099764 2018-08-08 2019-08-08 Production d'une bande d'acier coulée entre cylindres et laminée à chaud WO2020030040A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810895612.XA CN109881085A (zh) 2018-08-08 2018-08-08 基于双辊铸轧的易焊接热轧薄带q345及其制造方法
CN201810895612.X 2018-08-08

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WO2020030040A1 true WO2020030040A1 (fr) 2020-02-13

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PCT/CN2019/099764 WO2020030040A1 (fr) 2018-08-08 2019-08-08 Production d'une bande d'acier coulée entre cylindres et laminée à chaud

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