EP3943619A1 - Dispositif de trempe et procédé de fabrication de feuille métallique - Google Patents

Dispositif de trempe et procédé de fabrication de feuille métallique Download PDF

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Publication number
EP3943619A1
EP3943619A1 EP20784745.0A EP20784745A EP3943619A1 EP 3943619 A1 EP3943619 A1 EP 3943619A1 EP 20784745 A EP20784745 A EP 20784745A EP 3943619 A1 EP3943619 A1 EP 3943619A1
Authority
EP
European Patent Office
Prior art keywords
metal sheet
liquid
blowing device
restraining
steel sheet
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.)
Granted
Application number
EP20784745.0A
Other languages
German (de)
English (en)
Other versions
EP3943619A4 (fr
EP3943619B1 (fr
Inventor
Tomohiro HASHIMUKAI
Soshi Yoshimoto
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.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
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 JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP3943619A1 publication Critical patent/EP3943619A1/fr
Publication of EP3943619A4 publication Critical patent/EP3943619A4/fr
Application granted granted Critical
Publication of EP3943619B1 publication Critical patent/EP3943619B1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • 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
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching

Definitions

  • the present invention relates to a quenching apparatus used to dip a high-temperature metal sheet in a liquid and thereby cool the metal sheet and to a method for manufacturing a metal sheet by using the quenching apparatus.
  • Patent Literature 1 proposes a method in which out-of-plane deformation is inhibited by arranging a pair of restraining rolls in a quenching apparatus to restrain a metal sheet having a temperature almost within a temperature range for martensite transformation on the front- and back-surface sides of the metal sheet by using the restraining rolls.
  • Patent Literature 2 discloses a quenching apparatus in which a problem of a decrease in the cooling rate of a metal sheet caused by a pair of restraining rolls, which are arranged in a quenching apparatus as proposed in Patent Literature 1, is solved by using nozzles which are inclined from a horizontal plane.
  • Patent Literature 3 proposes a quenching apparatus in which a problem of a decrease in cooling rate in the vicinity of rolls is solved by using rolls having grooves along which cooling water is allowed to flow to eliminate stagnation of cooling water in the vicinity of the rolls.
  • Patent Literature 3 a problem of stagnant cooling water in the vicinity of the restraining rolls due to the restraining rolls being arranged as described in Patent Literature 1 is solved by forming grooves in the restraining rolls.
  • the cooling rate of the metal sheet since cooling water is inhibited from flowing through or over parts other than the grooves while the cooling water flows preferentially along the grooves, the cooling rate of the metal sheet has a non-uniform distribution in the width direction of the metal sheet corresponding to the period of the groove interval.
  • the material properties of the metal sheet such as tensile strength have non-uniform distribution corresponding to the period of the groove interval.
  • Non-uniformity in the material properties causes various problems when working such as pressing or bending is performed on the metal sheet.
  • the problems include a problem in which there is a deterioration in dimensional accuracy due to non-uniform deformation of the metal sheet when the metal sheet is subjected to working and a problem in which a striped pattern is formed on the surface of the metal sheet depending on the working method.
  • the present invention has been completed in view of the situation described above, and an object of the present invention is to provide a quenching apparatus for a metal sheet with which it is possible to achieve a sufficient cooling rate of the metal sheet when the metal sheet passes through a water-blowing device and to prevent a cooling rate from varying in accordance with the position in the metal sheet and to provide a method for manufacturing a metal sheet by using the quenching apparatus for a metal sheet.
  • the present inventors diligently conducted investigations to solve the problems described above and, as a result, obtained the following knowledge.
  • microstructure control is performed by allowing martensite transformation to occur in the steel sheet when a high-temperature steel sheet is subjected to rapid cooling by dipping the steel sheet in water and by blowing cooling water.
  • rapid volume swelling occurs in the microstructure due to martensite transformation, there may be a case where the steel sheet has a complex, non-uniform recessed and projected shape.
  • the metal sheet pass the central position in the out-of-plane direction, which is located at a position equidistant from both nozzles arranged on the front-surface side of the metal sheet and nozzles arranged on the back-surface side of the metal sheet, there may be a case where the pass line of the metal sheet is shifted due to the cooling water in the out-of-plane direction from the central position in the out-of-plane direction.
  • the cooling rate Due to the pass line of the metal sheet being shifted, since the distances between the nozzles and the metal sheet vary between the front surface and the back surface of the metal sheet and in accordance with the position in the width direction of the metal sheet, the cooling rate has a non-uniform distribution.
  • the present inventors found that holding the pass line of the metal sheet at the central position in the out-of-plane direction is effective for realizing uniformity in cooling rate and for thereby inhibiting the shape defect of the metal sheet.
  • the means of the present invention is as follows.
  • the present invention it is possible to prevent a decrease in the cooling rate of a metal sheet, to prevent the cooling rate from varying in accordance with the position in the metal sheet when the metal sheet passes through a water-blowing device, and to thereby manufacture a metal sheet having desired uniform material properties.
  • Fig. 1 is a schematic diagram illustrating a quenching apparatus 10.
  • Fig. 2 is an enlarged diagram illustrating part in the vicinity of a water-blowing device 14 of the quenching apparatus 10 illustrated in Fig. 1 .
  • the quenching apparatus 10 is used for cooling equipment placed on the exit side of a soaking zone in a continuous annealing furnace.
  • a steel sheet 11 as a specific example of a metal sheet
  • water 12 as an example of a liquid (cooling liquid)
  • a water tank 13 as an example of a dipping tank
  • a water-blowing device 14 as an example of a liquid-blowing device
  • the water 12 is contained in the water tank 13 in such a manner that at least part of the water-blowing device 14 is placed in the water 12.
  • the steel sheet 11 having a high temperature is discharged from the soaking zone in the continuous annealing furnace, in which a series of treatments for annealing involving heating, soaking, cooling, and reheating is performed, and is then transported into the water 12 from above the water tank 13.
  • cooling water is blown from nozzles 16 of the water-blowing device 14 onto both surfaces of the steel sheet 11 so that the steel sheet 11 is subjected to quenching.
  • the steel sheet 11 After the steel sheet 11 has been rapidly cooled, for example, to a temperature equal to the temperature of the cooling water through dipping in the water 12 and blowing of the cooling water, the steel sheet 11 is discharged through the exit 19 of the water tank 13 and transported to a subsequent process.
  • the quenching apparatus 10 has the water tank (dipping tank) 13 containing water 12, in which the steel sheet (steel strip) 11 is dipped, and the water-blowing device 14, which blows cooling water onto the steel sheet 11.
  • the quenching apparatus 10 has a sink roll 15 which is placed in the water 12 contained in the water tank 13 and which changes the transporting direction (traveling direction) of the steel sheet 11.
  • the water-blowing device 14 is arranged in such a manner that at least part thereof is in the water 12 contained in the water tank 13, and, in Fig. 1 , the water-blowing device 14 is arranged to straddle the steel sheet threading line, on which the steel sheet 11 passes, in such a manner that the devices face each other with a predetermined gap being provided therebetween.
  • the water-blowing device 14 has plural nozzles 16 which extend in the width direction of the steel sheet 11 and which blow cooling water onto the steel sheet 11 from both surface sides of the steel sheet 11.
  • the nozzles 16 are arranged on both sides of the pass line, on which the steel sheet 11 passes, in such a manner that, in Fig. 1 , eight nozzles 16 are arranged on each side at predetermined intervals in the transporting direction of the steel sheet 11.
  • all of the nozzles 16 are arranged in the water 12 contained in the water tank 13.
  • the cooling rate has a non-uniform distribution in the width direction and the thickness direction, which results in significantly large out-of-plane deformation occurring.
  • each of pairs of restraining rolls 20 is placed on a corresponding one of an upstream side and a downstream side in the traveling direction of the water-blowing device 14.
  • the restraining rolls 20 keep the steel sheet 11 flat when the steel sheet 11 passes through the water-blowing device 14 and hold the pass line of the steel sheet 11.
  • the quenching apparatus in a method for manufacturing a metal sheet (steel sheet).
  • the diameter of the restraining rolls 20 it is preferable that the diameter be 100 mm to 200 mm from the viewpoint of applying a sufficient restraining force to the steel sheet 11.
  • out-of-plane direction denotes a direction perpendicular to the front and back surfaces of the steel sheet 11.
  • shifted in the out-of-plane direction denotes a case where the pass line of the steel sheet 11 is shifted in a direction perpendicular to the front and back surfaces of the steel sheet (in Fig. 1 , the left-right direction) from the ideal position.
  • the ideal pass line in the side view viewed in the width direction of the steel sheet 11 as illustrated in Fig.
  • the central position in the thickness direction of the steel sheet 11 passes through a straight line passing through the central positions in the out-of-plane direction, where each of the central positions is equidistant from a pair of the nozzles 16 facing each other. It is acceptable that the pass line of the metal sheet (steel sheet) be shifted a slight amount from the central position in the out-of-plane direction as long as the effect of the present invention is realized. Specifically, in the side view as illustrated in Fig. 1 , it is acceptable that the central position in the thickness direction of the steel sheet be shifted, from the central position in the out-of-plane direction, an amount of 8% or less of the distance between the nozzle and the surface of the steel sheet.
  • each of the nozzles 16 horizontally, or more specifically, approximately parallel to the out-of-plane direction of the steel sheet 11. Therefore, since it is possible to inhibit an increase in the area in the traveling direction occupied by each of the nozzles, it is possible to inhibit a decrease in the number of nozzles arranged per unit length in the traveling direction, which results in a high cooling capacity being realized.
  • each pair of restraining rolls may be arranged in the traveling direction with a distance being provided between the central axes thereof, that is, such that one roll is offset in the traveling direction with respect to the other roll.
  • each pair of restraining rolls such that one roll is offset in the traveling direction with respect to the other roll as illustrated in Fig. 3 , it is possible to increase the effect of keeping the steel sheet 11 flat. More specifically, arranging one of the restraining rolls 20 constituting the pair which is farther than the other from the water-blowing device 14 at a position so that the restraining roll pushes the steel sheet 11 increases such an effect.
  • one restraining roll farther than the other from the water-blowing device 14 is at a position with a distance of about 1 mm to 5 mm toward the steel sheet 11 from a base position. In the base position, the restraining rolls contact to the steel sheet 11 with a distance of 0 mm and a winding angle between the steel sheet 11 and the restraining rolls 20 of 0°.
  • the distance between the restraining rolls 20 on the upstream side of the water-blowing device 14 and the restraining rolls 20 on the downstream side of the water-blowing device 14 be as small as possible.
  • each pair of the restraining rolls 20 be placed at a position within a range of 0 m to 1.2 m from a corresponding one of a cooling start point of the nozzles and a cooling stop point of the nozzles of the water-blowing device 14.
  • the restraining rolls are placed at positions within such a range, it is possible to keep the steel sheet 11 flat at a sufficient level without causing interference with the flow of the cooling water.
  • cooling start point of the nozzles denotes a position at which the upper end of the water flow blown from the most upstream nozzle and the front surface (or back surface) of the steel sheet 11 come into contact
  • cooling stop point of the nozzles denotes a position at which the lower end of the water flow blown from the most downstream nozzle and the front surface (or back surface) of the steel sheet 11 come into contact.
  • the present invention be applied to an apparatus for manufacturing a steel sheet having a tensile strength of 590 MPa or more.
  • a high strength cold rolled steel sheet having a thickness of 1.0 mm, a width of 1 m, and a tensile strength of a 1470 MPa class was manufactured at a threading speed of 100 mpm.
  • the quenching start temperature (at which dipping in the water tank 13 was started) of the steel sheet 11 was 750°C, and cooling was performed to a water temperature of 30°C.
  • Each of two pairs of pinch rolls was arranged as the restraining rolls 20 on a corresponding one of the upstream side and the downstream side in the traveling direction of the water-blowing device 14, that is, at a position 20 mm from a corresponding one of the cooling start point of the nozzles and the cooling stop point of the nozzles (Example 1).
  • the diameter of the restraining rolls 20 was 150 mm.
  • Comparative example 1 as described in Patent Literature 1, an experiment was performed in such a manner that a pair of restraining rolls were arranged in a water-blowing device.
  • Comparative example 2 as described in Patent Literature 3, an experiment was performed in such a manner that a pair of restraining rolls having grooves was arranged in a water-blowing device.
  • the tensile strength, tensile strength variation, and steel sheet shape of the steel sheets manufactured in the example and the comparative examples were evaluated.
  • the evaluation results are given in Table 1. After the tensile strength had been obtained by performing a tensile test in accordance with JIS Z 2241 on a JIS No. 5 tensile test specimen taken so that the tensile direction was the rolling direction, a tensile strength of lower than 1470 MPa was judged as ⁇ , and a tensile strength of 1470 MPa or higher was judged as ⁇ .
  • a tensile strength variation ratio was defined as the ratio of a tensile strength variation, which is the difference between the maximum tensile strength and the minimum tensile strength, to an average tensile strength across the whole width, a tensile strength variation ratio of less than 4% was judged as ⁇ , and a tensile strength variation ratio of 4% or more was judged as ⁇ .
  • a warpage quantity of the steel sheet of 10 mm or less was judged as ⁇ , and a warpage quantity of the steel sheet of more than 10 mm was judged as ⁇ .
  • the warpage quantity of the steel sheet was defined as the height of the highest point of the steel sheet when the steel sheet was placed on a horizontal plane.
  • Example 1 where there were no rolls inhibiting the flow of the cooling water in the water-blowing device 14, it was clarified that the steel sheet had a good shape and high tensile strength with no variation in strength in accordance with the position in the width direction.
  • Comparative example 1 where restraining rolls having no groove were used in the water-blowing device 14, although the steel sheet had a good shape, since there was a decrease in cooling rate compared with the case of Example 1 and Comparative example 2, the tensile strength did not reach the predetermined value.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP20784745.0A 2019-03-29 2020-03-17 Appareil de trempe et procede de fabrication de feuille métallique Active EP3943619B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019067348 2019-03-29
PCT/JP2020/011751 WO2020203261A1 (fr) 2019-03-29 2020-03-17 Dispositif de trempe et procédé de fabrication de feuille métallique

Publications (3)

Publication Number Publication Date
EP3943619A1 true EP3943619A1 (fr) 2022-01-26
EP3943619A4 EP3943619A4 (fr) 2022-05-04
EP3943619B1 EP3943619B1 (fr) 2023-11-08

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EP20784745.0A Active EP3943619B1 (fr) 2019-03-29 2020-03-17 Appareil de trempe et procede de fabrication de feuille métallique

Country Status (5)

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EP (1) EP3943619B1 (fr)
JP (1) JP7314989B2 (fr)
KR (1) KR20210130208A (fr)
CN (1) CN113677811A (fr)
WO (1) WO2020203261A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7306590B1 (ja) * 2021-09-16 2023-07-11 Ｊｆｅスチール株式会社 焼入れ装置及び連続焼鈍設備、並びに焼入れ方法、鋼板の製造方法及びめっき鋼板の製造方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58107424A (ja) * 1981-12-22 1983-06-27 Kawasaki Steel Corp 鋼板連続焼入れ装置
JPS58135725A (ja) * 1982-02-08 1983-08-12 Nippon Kinzoku Kk 帯板の張力付加装置
JPS59136427A (ja) * 1983-01-21 1984-08-06 Sumitomo Metal Ind Ltd 薄鋼板のロ−ル冷却法
JPS59143028A (ja) * 1983-02-03 1984-08-16 Nippon Steel Corp 連続熱処理炉における金属ストリツプの冷却装置
FR2651795B1 (fr) * 1989-09-14 1993-10-08 Sollac Dispositif de refroidissement par contact de rouleaux pour la trempe en continu d'une bande d'acier prechauffee.
JP2003277833A (ja) * 2002-03-22 2003-10-02 Jfe Steel Kk 金属板の製造方法および製造装置
JP2011184773A (ja) * 2010-03-10 2011-09-22 Kobe Steel Ltd 連続焼鈍設備およびその設備における急冷焼入時の金属板の波状変形抑制方法
CN101993995B (zh) * 2010-11-26 2012-05-30 首钢总公司 超高强度带钢水淬冷却方法及装置
JP6094722B2 (ja) 2014-11-28 2017-03-15 Ｊｆｅスチール株式会社 金属板の製造方法および急冷焼入れ装置
JP6308287B2 (ja) * 2015-12-28 2018-04-11 Ｊｆｅスチール株式会社 急冷焼入れ装置及び急冷焼入れ方法
WO2017115742A1 (fr) * 2015-12-28 2017-07-06 Ｊｆｅスチール株式会社 Dispositif de trempe par refroidissement rapide et procédé de trempe par refroidissement rapide
JP6624113B2 (ja) 2017-02-21 2019-12-25 Ｊｆｅスチール株式会社 急冷焼入れ装置

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Publication number Publication date
JPWO2020203261A1 (ja) 2021-12-16
JP7314989B2 (ja) 2023-07-26
KR20210130208A (ko) 2021-10-29
EP3943619A4 (fr) 2022-05-04
CN113677811A (zh) 2021-11-19
WO2020203261A1 (fr) 2020-10-08
EP3943619B1 (fr) 2023-11-08

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