WO2001007669A1 - Tole d'acier pour bande thermoretractable et son procede de production - Google Patents

Tole d'acier pour bande thermoretractable et son procede de production Download PDF

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Publication number
WO2001007669A1
WO2001007669A1 PCT/JP2000/004873 JP0004873W WO0107669A1 WO 2001007669 A1 WO2001007669 A1 WO 2001007669A1 JP 0004873 W JP0004873 W JP 0004873W WO 0107669 A1 WO0107669 A1 WO 0107669A1
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WO
WIPO (PCT)
Prior art keywords
steel sheet
rolling
steel
annealing
magnetic permeability
Prior art date
Application number
PCT/JP2000/004873
Other languages
English (en)
Japanese (ja)
Inventor
Hideki Matsuoka
Tatsuhiko Hiratani
Kenji Tahara
Yasuyuki Takada
Yasushi Tanaka
Yoshihiko Ono
Original Assignee
Nkk Corporation
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 Nkk Corporation filed Critical Nkk Corporation
Publication of WO2001007669A1 publication Critical patent/WO2001007669A1/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
    • 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
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/87—Means for avoiding vessel implosion

Definitions

  • the present invention relates to a heat-shrink band steel plate for tightening around a panel of a cathode ray tube used in a television or the like, and a method for manufacturing the same.
  • Background technology color cathode ray tube the tube body is 1. Since a high vacuum of about OX 10- 7 Torr, processing such deformation preventing and tube inner explosion prevention of the panel surface is required.
  • a heat shrink band made of a steel sheet formed into a band is heated and expanded for several seconds to several tens of seconds in a temperature range of about 400 to 600 ° C, fitted into a color CRT glass panel, and cooled and contracted to reduce tension.
  • the so-called shrink fit treatment prevents deformation of the panel surface and internal explosion of the tube. Furthermore, such a heat shrink band also has a function of shielding geomagnetism as well as an internal magnetic shield, and a shift in the landing position of the electron beam on the fluorescent screen due to the geomagnetism, that is, a color shift occurs. It has the function of preventing From this point of view, mild steel has been used as a material for heat shrink bands.
  • Japanese Patent Application Laid-Open No. 1-140601 discloses that, by weight%, C: 0.0008-0. 0050%, Si: 0.3.1.8, S: 0.002-0. 020%, Ti: Disclosed are cold rolled steel sheets with good geomagnetic shielding properties and a method for manufacturing the same, which are intended for use in TV CRT shrink bands with a composition of 0. CH-0.06%. Also, JP-A-11-158548 and JP-A-11-158549 disclose a TV cathode ray tube shrink band in which components such as C ⁇ 0.01 ° S i: u 4 are specified by weight%. A hot rolled steel sheet for use and a cold rolled steel sheet and a method for producing the same are disclosed.
  • Japanese Patent Application Laid-Open No. Hei 10-208670 states that a tension force for correcting the deformation of the panel surface due to the atmospheric pressure is secured.
  • a method for manufacturing a heat shrink band having a sufficient magnetic shielding property has been proposed.
  • this steel sheet for heat shrink bands uses mild steel, has a magnetic permeability of about 200 at the force-geomagnetic level (about 0.3 ⁇ e), and does not have sufficient magnetic shielding. Did not. Therefore, complicated steps such as adjusting the position of the phosphor screen have been required for color misregistration due to terrestrial magnetism.
  • Japanese Patent Application Laid-Open No. 1-140601 discloses that, after annealing, the relative permeability in a DC magnetic field of about 0.3 Oe decreases with temper rolling, shearing of a steel sheet, and processing into a part shape. Since it is used in the fitted state, much of the strain applied during the process of reheating to 600 ° C is released, and the geomagnetic shielding properties, that is, the relative magnetic permeability in a DC magnetic field of around 0.3 Oe, immediately after annealing This is not significantly different from the state described above. "In the Examples, examples in which temper rolling at an elongation of 0.3% was performed were shown. However, as will be described later, the present inventors have conducted a detailed investigation on the effect of the temper rolling reduction on the magnetic properties after shrink fitting. It became clear that the magnetic properties did not always return to the as-annealed state even when heat equivalent to the treatment was applied.
  • JP-A-11-58548 and JP-A-11-158549 state that both excellent coercive force and excellent strength are compatible.
  • the correlation between the magnetic properties and the magnetic properties described in the examples are those at the time of manufacture of the steel sheet, and there is no description on the magnetic properties when a treatment assuming shrink fitting is performed. It is not always clear how to improve sex.
  • the present invention has been made in view of the above circumstances, and a steel sheet for a heat shrink band capable of maintaining a sufficient magnetic shielding property and realizing a cathode ray tube having a small color shift and a manufacturing thereof.
  • the aim is to provide a method.
  • the first invention comprises a step of hot rolling steel, a step of cold rolling after hot rolling, and a step of annealing after cold rolling, wherein temper rolling is performed after force annealing. This is a method of manufacturing a heat shrink band steel sheet.
  • the second invention has a step of hot rolling steel, a step of cold rolling after hot rolling, and a step of annealing after cold rolling, and more than 0% to 0.5% or less after annealing.
  • This is a method for producing a steel sheet for heat shrink band, in which temper rolling is performed at an elongation rate.
  • the third invention is the method for producing a steel sheet for a heat shrink band according to claim 1 or 2, wherein a steel containing a weight r si: o. More than 1%-2% is hot-rolled.
  • a fourth invention is the method according to any one of claims 1 to 3, wherein the product Xt of the magnetic permeability and the plate thickness t (optionally) in a magnetic field of 0.3 e after the shrink fitting is 380 or more.
  • FIG. 2 is a diagram showing the relationship between Xt and the amount of geomagnetic drift.
  • the present invention is not particularly limited with respect to the chemical composition of the steel sheet, as long as it can secure a magnetic permeability that can maintain a sufficient magnetic shielding property while maintaining a level of strength that does not cause a problem in explosion protection.
  • C 0.005% or less
  • N 0.005% or less
  • Solid-solution strengthening elements such as Si, Mn, P, etc. in so-called ultra-low carbon steel are selected according to the desired strength.
  • Mn 0.1-2%
  • P 0.15% or less
  • A1 1% or less
  • Nb 0.005-0.04%
  • B 0.0003- 0.005 %
  • steel to which one or more elements that fix solid solution C, solid solution N and the like as precipitates are added.
  • Si is an element effective in increasing the strength and increasing the magnetic permeability, so it is recommended that Si be added in excess of 0.1, and that Si: more than 0%-2% steel be used in the present invention. As a result, it is possible to obtain a steel sheet for a heat shrink band, which has more excellent magnetic shielding properties and less color shift.
  • the amount of C It is effective to make the level as low as possible, but if the magnetic permeability can be ensured, it goes without saying that the amount of C and N may be out of the above range.
  • steelmaking, production, hot rolling, and cold rolling may be performed in a conventional manner.
  • the final thickness is not particularly limited, for example, a range of 0.6 to 2.0 mm is preferable.
  • the annealing after the cold rolling is preferably continuous annealing. This is because in the case of batch annealing, high elongation temper rolling is indispensable to correct the shape after annealing, rolling strain is introduced into the steel sheet, and the magnetic properties in that state and after shrink fitting are reduced. This is due to deterioration.
  • the annealing temperature and time are determined in consideration of the balance between the strength and the magnetic permeability of the steel sheet.
  • the concept of setting the annealing temperature to the magnetic permeability is shown below.
  • the magnetic permeability of the material improves as the annealing temperature increases, but no remarkable change in the magnetic permeability is observed.
  • the annealing temperature is higher than this temperature range, the magnetic permeability is significantly improved.
  • the annealing temperature is increased, there is a temperature region where the magnetic permeability decreases.
  • This change in magnetic permeability corresponds to the mouth M of the steel sheet.
  • the annealing temperature should be determined according to the chemical composition of the steel.
  • the annealing temperature is 650 It is necessary to be between 750 ° C and 900 ° C, preferably between 750 ° C and 900 ° C.
  • the annealing temperature is 750 ° C or more and 875 ° C. It is more preferred that:
  • the annealing temperature In the case of ultra-low carbon steel containing one of Ti, 'b, and B, the annealing temperature must be between 700 ° C and 900 ° C, and between 750 ° C and 900 ° C. Preferably, the annealing temperature is more preferably 750 ° C or more and 875 ° C or less in consideration of material stability in a high temperature range. In the case of ultra-low carbon steel containing two or more of Ti, Nb and B, the annealing temperature must be between 750 ° C and 900 ° C, and between 780 ° C and 900 ° C. In consideration of material stability in a high temperature range, the annealing temperature is more preferably 780 ° C or more and 875 ° C or less.
  • the overaging zone is not cooled down to around room temperature, for example, in a temperature range of 250 to 500 ° C.
  • room temperature for example, in a temperature range of 250 to 500 ° C.
  • the elongation must be 0.5% or less, preferably less than 0.3%. This is determined as a condition in which the magnetic permeability is significantly lower than that of the unpressurized material from the relationship between the magnetic permeability after the shrink-fitting equivalent heat treatment and the temper rolling conditions as described later.
  • the heat shrink band may be plated from the viewpoint of corrosion resistance.
  • the steel plate manufactured by the above method may be subjected to electric plating according to a conventional method.
  • Plating species is not particularly limited, for example, Zn, Zn- N T i alloy, Ni, Sn, monolayers plated such as Cr or their multilayered plating,, etc. are applicable.
  • the type of plating is not particularly limited.
  • a single-layer plating of Zn, Zn-Al alloy, A1, etc., a multi-layer plating thereof, or a part or all of the plating layer and the ground iron Suitable for alloyed plating, etc. Is available. It is also possible to form various chemical conversion coatings on the steel sheet surface or plating surface.
  • the product Xt of the magnetic permeability and the plate thickness t (ram) in a magnetic field of 0.3 e after the shrink fitting is 380 or more, more preferably 400 or more, and further preferably Is 420 or more. This is determined as a condition in which the color shift (drift amount of the electron beam) force is significantly lower than that of the conventional technology due to the relationship between the color shift and the magnetic permeability as described later.
  • the measurement of magnetic permeability in a magnetic field of 0.30 e was performed on this sample that had been annealed at 500 ° C and 600 ° C for 60 seconds, which was a heat treatment equivalent to shrink fitting. As a criterion, the same measurement was performed for a material without heat treatment equivalent to shrink fit of unpressurized material.
  • FIG. 1 is a diagram showing the relationship between the elongation ratio and the magnetic permeability of the temper rolling.
  • the vertical axis shows the value obtained by dividing the magnetic permeability of each material by the magnetic permeability of the unregulated original plate (before heat treatment equivalent to shrink fit).
  • the higher permeability than the original sheet after heat treatment equivalent to shrink fitting is due to the strain force introduced when processing the annealed material or when handling the sample. This is considered to be due to the release by heat treatment equivalent to shrink fit. Also, the reason why the value of the heat treatment temperature equivalent to shrink fit of 600 ° C is higher than that of the case of 500 ° C is considered that the strain relief is more likely to proceed in the high temperature treatment. Up to an elongation of 0.5, although the permeability of the material slightly decreases as the elongation increases, a permeability of 80% or more of the unregulated original plate can be secured.
  • a magnetic permeability of 90% or more of the unpressurized master sheet can be obtained after heat treatment equivalent to shrink-fitting.
  • temper rolling with an elongation ratio exceeding 0.5 is performed, even after the heat treatment equivalent to shrink fit, a magnetic permeability of less than 80% of the unpressurized master sheet can be obtained.
  • the cause is not necessarily clear, according to the findings of the present inventors, when the elongation rate is extremely small up to 0.5 mm, the strain introduced into the steel sheet by temper rolling is compared to the extreme surface of the steel sheet. Although it is introduced uniformly uniformly, it is only introduced very coarsely inside the steel sheet, and as a result, the permeability reduction effect after heat treatment equivalent to shrink fit was not remarkable, but the elongation exceeded 0.5% In this case, it is presumed that the amount of strain introduced is so large that it cannot be completely released by the heat treatment equivalent to shrink fit.
  • temper rolling is performed for the purpose of preventing surface defects generally called stretcher strain marks after work forming.
  • stretcher strain marks In the case of a heat shrink band, however, Forming and processing are not severe in nature, so no remarkable surface defects occur without temper rolling. Rather, from the viewpoint of obtaining high magnetic permeability, it is desirable to omit temper rolling if there is no problem in appearance.
  • the processed band After heating the processed band at 500 ° C for 60 seconds, it was fitted into a 29-inch TV cathode ray tube panel, and the geomagnetic drift was evaluated to evaluate the color shift.
  • FIG. 2 is a diagram showing the relationship between color misregistration and magnetic permeability. Bh and Bv on the vertical axis indicate the drift amount of the landing point of the electron beam. Specifically, with a vertical magnetic field of 0.35 Oe and a horizontal magnetic field of 0.3 Oe applied to the CRT, the CRT is rotated 360 ° and the displacement of the landing point of the electron beam with respect to the reference point is (Landing error) was measured, and the difference between the maximum value and the minimum value was taken as the horizontal drift amount Bh.
  • the horizontal magnetic field was OO e and the landing error when the vertical magnetic field was changed from OO e to 0.35 0e was measured as the vertical drift Bv. Note that the drift amount of the landing error on the vertical axis is shown as a relative value when the value of the above-mentioned conventional material is set to 1.
  • the horizontal axis in the figure represents the product x X t of the magnetic permeability at an external magnetic field of 0.3 Oe equivalent to the geomagnetism and the plate thickness t (thigh).
  • the magnetic permeability was measured on a ring specimen taken from the annealed plate before the shrink fitting, after performing a heat treatment at 500 ° C for 60 seconds corresponding to the shrink fitting.
  • the ratio of both Bh and Bv to the conventional material is around 1.0 up to Xt of about 300, which is about the same value as that of the conventional material, but tends to decrease remarkably from 380. From this, it can be seen that the color shift due to the geomagnetism is improved by increasing / z X t, and the value is 380 or more, which is superior to the conventional material.
  • the effect of preventing color misregistration is more excellent when Xt is 400 or more, and more excellent when Xt is 420 or more.
  • test steels shown in Table 1 After smelting the test steels shown in Table 1, they were heated to 1200-1280 ° C and hot-rolled to a plate thickness of 3.2 strokes at a finishing temperature of 820-900 ° C and a winding temperature of 680 ° C. After pickling the obtained hot-rolled sheet, cold-rolling to a sheet thickness of 1.0-1.2 1., annealing at 700-850 ° C for 90 seconds, and then Overage treatment was applied for minutes. These steel sheets were further heated to 500 ° (equivalent to shrink fit) for 5 seconds and air-cooled to room temperature before yield stress, DC magnetic properties (permeability at 0.3 Oe, and external magnetic field up to 10 Oe).
  • the coercive force at the time of excitation was measured by a ring test piece (outer diameter: 45, inner diameter: 33mm) Also, the annealed material (including the temper-rolled one) was processed into a band After heating to ° C, it was fitted into a 29-inch TV cathode ray panel via a double-sided adhesive tape, and the geomagnetic drift property was evaluated.
  • W The coercive force at the time of excitation was measured by a ring test piece (outer diameter: 45, inner diameter: 33mm)
  • the annealed material including the temper-rolled one
  • was processed into a band After heating to ° C it was fitted into a 29-inch TV cathode ray panel via a double-sided adhesive tape, and the geomagnetic drift property was evaluated.
  • Table 2 shows the results.
  • the geomagnetic drift property is shown in Table 1 as a relative value when the geomagnetic drift amount of one temper-rolled material of the test steel as a conventional material is set to 1.
  • Table 2 shows that in the example of the present invention in which the elongation ratio of the temper rolling is within the range of the present invention, there is no deterioration of the magnetic permeability due to the strain introduced at the time of the temper rolling.
  • the product of magnetic permeability and the thickness t (thigh) / iXt of the magnetic field was 380 or more, confirming that it exhibited excellent characteristics in geomagnetic drift. Further, it was confirmed that the examples of the present invention exhibited stable magnetic characteristics regardless of the presence or absence of overaging treatment or the temperature of overaging treatment.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

Un procédé de production d'une tôle d'acier destinée à une bande thermorétractable comprend les étapes consistant à laminer à chaud l'acier, à laminer à froid l'acier laminé à chaud et à soumettre à recuit l'acier laminé à froid, l'acier recuit n'étant pas soumis à écrouissage ou soumis à un écrouissage à un allongement supérieur à 0 % et jusqu'à 0,5 %, de manière qu'un tube cathodique couleur pouvant maintenir un rendement de blindage magnétique suffisant et ayant un décalage des couleur minimum puisse être obtenu par une tôle d'acier destinée à une bande thermorétractable produite par ce procédé.
PCT/JP2000/004873 1999-07-22 2000-07-21 Tole d'acier pour bande thermoretractable et son procede de production WO2001007669A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11/207505 1999-07-22
JP20750599 1999-07-22

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WO2001007669A1 true WO2001007669A1 (fr) 2001-02-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6562150B2 (en) * 1999-08-11 2003-05-13 Nkk Corporation Steel sheet for heat shrink band and manufacturing method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1161255A (ja) * 1997-08-19 1999-03-05 Kawasaki Steel Corp 磁気特性に優れたフェライト系ステンレス鋼板の製造方法
JPH11140601A (ja) * 1997-11-05 1999-05-25 Nippon Steel Corp 地磁気シールド特性の良好な高強度冷延鋼板および高強度めっき鋼板とその製造方法
JPH11158549A (ja) * 1997-11-21 1999-06-15 Nippon Steel Corp Ｔｖブラウン管シュリンクバンド用冷延鋼板およびその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1161255A (ja) * 1997-08-19 1999-03-05 Kawasaki Steel Corp 磁気特性に優れたフェライト系ステンレス鋼板の製造方法
JPH11140601A (ja) * 1997-11-05 1999-05-25 Nippon Steel Corp 地磁気シールド特性の良好な高強度冷延鋼板および高強度めっき鋼板とその製造方法
JPH11158549A (ja) * 1997-11-21 1999-06-15 Nippon Steel Corp Ｔｖブラウン管シュリンクバンド用冷延鋼板およびその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6562150B2 (en) * 1999-08-11 2003-05-13 Nkk Corporation Steel sheet for heat shrink band and manufacturing method thereof

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