CN1380912A - Steel sheet for heat shrink band - Google Patents

Steel sheet for heat shrink band Download PDF

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Publication number
CN1380912A
CN1380912A CN01801456A CN01801456A CN1380912A CN 1380912 A CN1380912 A CN 1380912A CN 01801456 A CN01801456 A CN 01801456A CN 01801456 A CN01801456 A CN 01801456A CN 1380912 A CN1380912 A CN 1380912A
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steel sheet
sample
heat shrink
content
permeability
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CN01801456A
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CN1196805C (en
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小野義彦
松冈秀树
平谷多津彦
田中靖
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JFE Engineering Corp
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Nippon Steel Corp
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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
    • C22C38/02—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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/04—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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/867—Means associated with the outside of the vessel for shielding, e.g. magnetic shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)

Abstract

The present invention provides a steel sheet for a heat shrink band, containing, by mass %, 0.005% or less of C, 0.5 to 4% of Si, 2% or less of Mn, 0.2% or less of P, 0.04% or less of S, 0.2% or less of sol.Al, 0.01% or less of N, 0.0003 to 0.004% of B, 0.005% or less of O, and 0.002 to 0.1% of Sb, the balance being substantially formed of Fe, or a steel sheet for a heat shrink band further having a ratio of content of B to content of N (B/N) in the range from 0.2 to 1. This steel sheet realizes a heat shrink band having high strength and sufficient magnetic shielding properties.

Description

Steel sheet for heat shrink band
Technical field
The present invention relates to a kind of color cathode ray tube (hereinafter referred to as CRT) panel shrink belt (hereinafter referred to as the HS panel) on every side that is fastened on and use steel plate.
Background technology
Because in the body of CRT is 1 * 10 -7High vacuum state about Torr is so must prevent the processing of panel deformation and body implosion.As one of above-mentioned processing, use steel plate in the time of 400-600 ℃ of temperature range internal heating several seconds on banded HS band to tens of seconds, after it is expanded it is contained on the face glass of CRT, shrinks by cooling then and be fastened on around the panel, carry out so-called hot charging and handle.
In the past, as carrying out the HS band steel plate that hot charging is handled, because must be in light weight and have high intensity and ductility, so the cold-rolled steel sheet of the thickness of slab 0.8 to 2mm of electroplating processes was carried out in use.Recently, owing to, do one's utmost to require the HS band is used the steel plate attenuate, so require its intensity higher in order to make CRT lightweight more.In addition, be with the magnetic shield performance of steel plate if improve HS external magnetic fields such as earth magnetism, then can significantly reduce the aberration that the skew because of the electron beam point of impact produces, so, the requirement of above-mentioned magnetic shield performance (high permeabilityization) is also become strong along with the big pictureization of televisor and the high definitionization of complanation and graphoscope.
As realizing HS the band high strength of steel plate and the method for high permeabilityization, for example open in the flat 11-86755 communique the spy, disclose a kind of Si that mass percent is 1-2% that adds, the solution strengthening ability by Si realizes high strength and to the method for the high permeabilityization in the magnetic field of earth magnetism level.In addition, open in the flat 11-158549 communique, disclose the crystal grain diameter that a kind of suitable adjustment contains the Si steel plate, achieve high strength, suitably adjust inclusion simultaneously and form, achieve the method for high permeabilityization the spy.
Yet, open in the method for flat 11-86755 communique record the spy, can't obtain all enough high steel plate of intensity, permeability.In addition, open in the method for flat 11-158549 communique record the spy, the refinement by crystal grain realizes high strength, but because grain refining causes the permeability reduction, so can't realize high strength and high permeabilityization simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of high strength HS band steel plate of high permeability simultaneously.
Above-mentioned purpose be by containing mass percent be below the C:0.005%, Si:0.5-4%, below the Mn:2%, below the P:0.2%, below the S:0.04%, sol.Al (solid solution Al): below 0.2%, N:0.01% is following, B:0.0003-0.004%, O:0.005% are following, Sb:0.002-0.1%, and the rest part HS that in fact is made up of Fe is with and realizes with steel plate.
Description of drawings
Fig. 1 is the diagram of the relation of expression O content and specific permeability.
Fig. 2 is the diagram of the relation of expression Sb content and specific permeability.
Fig. 3 is the diagram of expression B content, B/N and specific permeability relation.
Embodiment
We extremely pay close attention to the B that is formed with the thick precipitate that is beneficial to high permeabilityization easily, and the result about the high permeability research that contains the B steel plate obtains to draw a conclusion.
1) because to help the avidity of the B of high permeabilityization and oxygen (O) strong, so the fine B that easy generation can be examined under a microscope during slab casting 2O 5, therefore have the tendency that reduces permeability.
When 2) slab heats before the hot rolling,, form poor B layer, cause permeability to reduce owing to carry out the oxidizing reaction of B on the slab top layer.
3) because the avidity of B and nitrogen (N) is also very strong, so form thick precipitate easily, but when slab heating or cold rolling after annealing, owing to carry out nitrogenizing reaction on the top layer of slab or steel plate and the N in the process furnace gaseous media, so can not give full play to the effect that adds B.
4) generate B when preventing above-mentioned slab casting 2O 5, and prevent to form poor B layer or nitride on the top layer of slab or steel plate, it is effective reducing O content during slab casting and adding Sb.
The present invention obtains on the basis of above-mentioned cognition, is elaborated below.
1.O the relation of content and specific permeability
Smelting contains C:0.002%, Si:1.2%, Mn:1%, P:0.07%, S:0.004%, sol.Al:tr. (trace) or 0.01%, N:0.002%, B:0.0016%, and O content the 0.001-0.01% range contain the B steel after, by hot rolling and cold rolling, roll into the steel plate of thickness of slab 1.2mm, 680-730 ℃ of annealing, to change crystal grain diameter, make the sample that yield strength is YP:330-340MPa.Adjustment adds the degassing treatment time behind Si and the Al, makes the O content.In addition, if under the big state of dissolved oxygen content, add B, then owing to existing B to form oxide compound and the possibility of loss, so add B before after the degassing is handled, casting.
The sample that obtains is processed into the cores-loss test test piece of 25cm, and the specific permeability (μ/μ when being determined at it and being magnetized into 23.9A/m (0.3Oe) 0: μ 0Be permeability of vacuum).In addition, for O content, owing to almost do not have difference with its analytical value of annealing back after the hot rolling, so use the value after the annealing.
Fig. 1 represents the relation of O content and specific permeability.In Fig. 1, the sample of zero expression sol.Al:tr., ● the sample of expression sol.Al:0.01%.
Permeability and O content that B adds steel have substantial connection, no matter are the samples of sol.Al:tr., or the sample of sol.Al:0.01%, when O content 0.005% when following, can obtain high specific permeability.When observing precipitate that O content is the sample 0.005% below and inclusion, discovery B almost all is that the form with thick nitride exists.In addition, in the sample of sol.Al:tr., the oxide compound major part is SiO 2, in the sample of sol.Al:0.01%, the oxide compound major part is Al 2O 3
2.Sb the relation of content and specific permeability
Smelting contains C:0.002%, Si:1.2%, Mn:1%, P:0.07%, S:0.004%, sol.Al:0.02%, N:0.002%, B:tr. or 0.0015%, O:0.002%, and Sb content is behind the steel of tr.-0.2% range, under these conditions, carry out hot rolling, cold rolling, annealing, make sample.Then, measure specific permeability as stated above.
Fig. 2 represents the relation of Sb content and specific permeability.In Fig. 2, the sample of zero expression B:0.0015%, ● the sample of expression B:tr..
As seen from the figure, add the sample of B:0.0015% and compare with the sample that does not add B, specific permeability is higher, and be 0.002-0.1% at Sb, be preferably in the 0.004-0.05% scope, can obtain higher specific permeability.
For having added the sample that B and Sb are tr. and 0.02%, carry out the chemical analysis of B and N to the thickness of slab direction from the top layer, find at Sb to be in the sample of tr., reduce gradually from the top layer near the interior B content in the zone the 50 μ m.Think that this is because the preferential oxidized result of B.In addition, in the zone from the top layer to 30 μ m, N content is slightly more than the thickness of slab centre portions, and as seen nitrogenizing reaction has taken place.On the other hand, in Sb is 0.02% sample, oxidizing reaction and the nitrogenizing reaction of B do not take place almost.
3.B the relation of content, B/N and specific permeability
Smelting contains C:0.002%, Si:1.2%, Mn:1%, P:0.07%, S:0.004%, sol.Al:0.01%, N:0.003%, O:0.002%, Sb:0.01%, and B content is behind the steel of tr.-0.006% range, under these conditions, carry out hot rolling, cold rolling, annealing, make sample.Then, measure specific permeability as stated above.In addition, for containing C:0.002%, Si:1.2%, Mn:1%, P:0.07%, S:0.004%, sol.Al:0.01%, N:0.003%, O:0.002% or 0.006%, do not add the sample that Sb and B content change in the tr.-0.006% scope, carry out same test yet.
Fig. 3 represents the relation of B content, B/N and specific permeability.In Fig. 3, the sample of zero expression O:0.002%, Sb:0.01%, ● the sample of expression O:0.002%, the sample of ▲ expression O:0.006%.
As seen from the figure, in the scope of B:0.0003-0.004%, the sample of Sb:0.01% is compared with the sample that does not add Sb, can obtain higher specific permeability, and at B/N:0.2-1.0, be preferably in the scope of 0.5-0.8, can obtain higher specific permeability.Particularly B/N is 0.7 o'clock, can obtain obviously high specific permeability.On the other hand, do not adding under the situation of Sb, the sample of O:0.002% near the B/N:0.9, the sample of O:0.006% can obtain maximum specific permeability, but all can't compare with the sample of Sb:0.01% near B/N:1.2.
Below the reason that limits O, Sb, B other composition elements is in addition described.
C: if surpass 0.005%, will carbide precipitate, permeability is reduced.Therefore, be limited to below 0.005%.
Si: be the important element that makes intensity improve, permeability is improved.Therefore, need be limited to more than 0.5%.If but surpassed 4%, the effect that permeability is improved will reduce, and can cause the deterioration and the embrittlement of welding property.So, be limited to the scope of 0.5-4%.
Mn: being little to the influence of permeability, is the element that intensity is improved by solution strengthening.Therefore, in order to ensure intensity, need to add this element.If but surpassed 2%, could cause permeability to worsen.So, be limited to below 2%.
P: the influence to permeability is little, even trace also has very big solid solution strengthening effect.Therefore, wish to add this element.If but surpassed 0.2%, then welding property could significantly worsen.So, be limited to below 0.2%.
Sol.Al: purpose is to make O formation oxide compound and reduce O content, wishes to add this element.If but surpassed 0.2%, could cause cost to raise.Therefore, be limited to below 0.2%.In addition, stablize formation oxide S iO 2, to stablize and form Al below 0.001% 2O 3, wish more than 0.005%.
N: owing to be easy to form precipitate, permeability is worsened, should be limited to below 0.01%.
Though it is very little that other element and Sb compare effect, in order to prevent to form the oxide compound of B and the nitrogenize on top layer, can add among Sn:0.003-0.15%, the Cu:0.05-0.2% a kind of at least.
There is no particular limitation with the manufacture method of steel plate for HS of the present invention band, for example with behind the converter smelting, by the degassing handle etc. carry out the adjusted steel casting of composition after, carry out processing such as common hot rolling, cold rolling, annealing and make.As required, can use the secondary cold-rolling method, the hot-rolled steel after the hot rolling is soon annealed for twice repeatedly, cold rolling, annealing.
In addition, consider, the electrolytic coating of Zn, Ni, Al, Sn, Cr, Zn-Ni alloy, Zn-Al alloy etc. can be set on HS is with steel plate from the erosion resistance of HS band.In addition, can electroplate the above-mentioned metal of multilayer, perhaps also can make part or all alloying of electrolytic coating and matrix.And as required, can on steel plate or electrolytic coating, form chemical conversion and handle film.
Embodiment
With converter smelting, by the degassing handle carry out after the composition adjustment slab that cast, that have various compositions 1150 ℃ down heating under 680 ℃ of conditions of coiling temperature, be rolled into thickness of slab 3.2mm steel plate after 1 hour.After the hot-rolled steel sheet that obtains carried out pickling, be cold-rolled to thickness of slab 1.2mm, then at 10%H 2-90%N 2Gaseous media in 680-820 ℃ of down annealing 60 seconds, make steel plate 1-12.Subsequently, steel plate 2-9 being carried out elongation is the smooth of 0.3-1.5%.Then, steel plate 1-12 being carried out to the differentiation credit analyses, measures yield strength YP, measures specific permeability when magnetizing to 23.9A/m with 25mm iron loss sample with the JIS5 sample.
Chemico-analytic result is as shown in table 1.In addition, the result of yield strength, specific permeability is as shown in table 2.
By above-mentioned table as can be known, HS band within the scope of the present invention has high yield strength and high specific permeability simultaneously with steel plate.
On the other hand, in comparative example, specific permeability was low when yield strength was high, and yield strength was low when specific permeability was high, can not satisfy the characteristic of two aspects simultaneously.
Table 1
Steel plate No. Chemical ingredients (quality %) ???B/N Remarks
??????C ?????Si ?????Mn ?????P ??????S ???sol.Al ??????N ??????B ????Sb ????O
????1 ????0.0015 ?????0.5 ?????0.7 ????0.11 ????0.002 ?????0.02 ???0.0012 ???0.0011 ??0.003 ??0.002 ???0.92 Example
????2 ????0.0018 ?????1.2 ?????1.1 ????0.07 ????0.004 ?????0.03 ???0.0021 ???0.0015 ??0.005 ??0.003 ???0.71 Example
????3 ????0.0029 ?????2.4 ?????1.6 ????0.05 ????0.002 ?????0.02 ???0.0018 ???0.0015 ??0.008 ??0.003 ???0.83 Example
????4 ????0.0024 ?????1.2 ?????1.0 ????0.08 ????0.001 ?????0.01 ???0.0016 ???0.0002 ??0.012 ??0.002 ???0.13 Example
????5 ????0.0010 ?????1.3 ?????1.1 ????0.07 ????0.003 ?????0.02 ???0.0018 ???0.0024 ??0.030 ??0.004 ???1.33 Example
????6 ????0.0018 ?????1.2 ?????1.0 ????0.07 ????0.003 ?????tr. ???0.0022 ???0.0012 ??0.080 ??0.002 ???0.55 Example
????7 ????0.0022 ?????1.3 ?????1.0 ????0.08 ????0.002 ?????0.11 ???0.0015 ???0.0011 ??0.050 ??0.001 ???0.73 Example
????8 ????0.0016 ?????1.3 ?????1.0 ????0.07 ????0.002 ?????0.02 ???0.0025 ???0.0010 ???tr. ??0.002 ???0.40 Comparative example
????9 ????0.0023 ?????1.3 ?????1.1 ????0.07 ????0.005 ?????0.01 ???0.0021 ???0.0019 ??0.005 ??0.008 ???0.90 Comparative example
????10 ????0.0021 ?????1.2 ?????1.1 ????0.07 ????0.004 ?????0.03 ???0.0018 ????tr. ??0.007 ??0.003 ????0 Comparative example
????11 ????0.0019 ?????1.2 ?????1.0 ????0.07 ????0.002 ?????0.02 ???0.0022 ???0.0045 ??0.003 ??0.003 ???2.05 Comparative example
????12 ????0.0018 ?????1.2 ?????1.0 ????0.07 ????0.004 ?????0.27 ???0.0021 ???0.0018 ??0.004 ??0.003 ???0.86 Comparative example
Table 2
Steel plate No. Smooth elongation (%) ????YP ??(N/mm2) ???μ/μ0 Remarks
????1 ?????- ????310 ????660 Example
????2 ?????- ????350 ????750 Example
????2 ????0.3 ????320 ????700 Example
????2 ????0.8 ????330 ????620 Example
????2 ????1.5 ????370 ????540 Example
????3 ?????- ????390 ????830 Example
????4 ?????- ????340 ????680 Example
????5 ?????- ????350 ????680 Example
????6 ?????- ????350 ????690 Example
????7 ?????- ????350 ????740 Example
????8 ?????- ????350 ????650 Comparative example
????9 ?????- ????340 ????640 Comparative example
????9 ????0.3 ????310 ????590 Comparative example
????9 ????0.8 ????320 ????510 Comparative example
????9 ????1.5 ????350 ????440 Comparative example
????10 ?????- ????340 ????650 Comparative example
????11 ?????- ????350 ????580 Comparative example
????12 ?????- ????350 ????610 Comparative example

Claims (7)

1. steel sheet for heat shrink band, containing mass percent is that C:0.005% is following, Si:0.5-4%, Mn:2% are following, P:0.2% is following, S:0.04% is following, sol.Al:0.2% is following, N:0.01% is following, B:0.0003-0.004%, O:0.005% are following, Sb:0.002-0.1%, and in fact rest part is made up of Fe.
2. steel sheet for heat shrink band according to claim 1, Sb mass percent are 0.004-0.05%.
3. steel sheet for heat shrink band according to claim 1, B is B/N:0.2-1 with the content ratio of N.
4. steel sheet for heat shrink band according to claim 2, B is B/N:0.2-1 with the content ratio of N.
5. steel sheet for heat shrink band according to claim 3, B is B/N:0.5-0.8 with the content ratio of N.
6. steel sheet for heat shrink band according to claim 4, B is B/N:0.5-0.8 with the content ratio of N.
7. a shrink belt is made by described any one steel plate of claim 1 to 6.
CNB018014569A 2000-06-30 2001-06-13 Steel sheet for heat shrink band Expired - Fee Related CN1196805C (en)

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JP2000198653A JP3968964B2 (en) 2000-06-30 2000-06-30 Steel plate for heat shrink band
JP198653/2000 2000-06-30

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CN1196805C CN1196805C (en) 2005-04-13

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KR100468298B1 (en) 2005-01-27
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WO2002002838A1 (en) 2002-01-10
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JP3968964B2 (en) 2007-08-29
KR20020044133A (en) 2002-06-14
US20020139450A1 (en) 2002-10-03

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