CN1361305A - High-strength cold-rolled steel sheet with excellent geomagnetic shielding character, its producing mehtod and use - Google Patents

High-strength cold-rolled steel sheet with excellent geomagnetic shielding character, its producing mehtod and use Download PDF

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CN1361305A
CN1361305A CN 01121129 CN01121129A CN1361305A CN 1361305 A CN1361305 A CN 1361305A CN 01121129 CN01121129 CN 01121129 CN 01121129 A CN01121129 A CN 01121129A CN 1361305 A CN1361305 A CN 1361305A
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shielding character
steel
steel plate
high strength
geomagnetic shielding
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CN1134551C (en
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佐久间康治
田中晓
小山一夫
宫内优二郎
伊丹淳
久保田猛
加藤广明
佐藤长八
竹内辉夫
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Nippon Steel Corp
Sony Corp
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Nippon Steel Corp
Sony Corp
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Priority claimed from JP30263197A external-priority patent/JP2002012956A/en
Priority claimed from JP06505598A external-priority patent/JP4180685B2/en
Application filed by Nippon Steel Corp, Sony Corp filed Critical Nippon Steel Corp
Publication of CN1361305A publication Critical patent/CN1361305A/en
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    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • 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
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/02—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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1272—Final recrystallisation annealing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/0015—Preventing or cancelling fields leaving the enclosure
    • H01J2229/0023—Passive means
    • 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

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  • Metallurgy (AREA)
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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
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  • Heat Treatment Of Sheet Steel (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
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Abstract

A high-strength cold rolled steel sheet and a high-strength plated steel sheet which have excellent geomagnetism shielding characteristics. The method of manufacturing these steel sheets comprises deoxidizing very low carbon steel which has not more than 0.0060 % of C, and which has been strengthened by solid solution with Si and Mn but not by a deposition strengthening, in such a manner that A1 does not substantially remain in the steel, or adding B to the steel for restraining the deposition of A1N when deoxidization of the steel with A1 is carried out, subjecting the resultant steel to finishing rolling at 750 DEG -980 DEG C, subjecting the steel to 60-90 % cold rolling, and then annealing the steel in continuous annealing equipment or in-line annealing type continuous molten zinc plating equipment in a temperature range of not lower than 750 DEG C and not higher than Ac3 point so as to set the ferrite crystal grain size in its metallographic structure to 10-200 mu m.

Description

The high strength cold rolled steel plate of excellent geomagnetic shielding character, its manufacture method and purposes
The application is to be that October 30, application number in 1998 are dividing an application of 98803063.2 patent application the applying date.
Technical field
The invention relates to the high strength cold rolled steel plate and the high strength plated steel sheet of excellent geomagnetic shielding character, the telochrome that uses this steel plate is with anti-explosion hoop or external magnetism shielding material and manufacture method thereof.
Background technology
When using steel sheet in the purposes such as electrical article or automobile, furniture, building of being in, intensity, rust-preventing characteristic etc. are the representatives as necessary characteristic, but concerning parts such as the anti-explosion hoop of telochrome or bearer frame, when the space that makes electron beam by constituting by these parts, require the shielding influence of geomagnetic, so that be not partial to.Be that specific permeability in the direct magnetic field that means about 0.3 oersted that is being equivalent to earth magnetism is big at this so-called excellent geomagnetic shielding character, even the significant automobile of the development of electronically controlledization also has the possibility of the flase operation that can suppress machine by using such steel plate.
In order to reach excellent geomagnetic shielding character, generally use the non-oriented magnetic steel sheet of stipulating among the JIS C2552 just can easily realize.But as necessary, only be that specific permeability in the direct magnetic field that makes about 0.3 oersted that is equivalent to earth magnetism is big, and the characteristic in the upfield as the whirler is not as necessary, if with making with the identical equipment of steel sheet that punch process is used, just both enlarge the thickness range that to make, and can reduce manufacturing cost again.
In order to make the specific permeability in the direct magnetic field about 0.3 oersted that is equivalent to earth magnetism big, know: minimizing is present in the tiny precipitate in the steel and makes the ferrite crystal grain alligatoring, thereby neticdomain wall is moved easily, is effective.For example open in the flat 3-61330 communique and put down in writing the use carbon aluminium-killed steel,, make the method for grain coarsening by open coil annealing the spy.Put down in writing the steel that makes by continuous annealing C reaches below 0.01%, impurity is few at fair 8-6134 communique of spy or special opening in the flat 8-27520 communique in addition, made the method for grain coarsening.Yet deducibility, according to the steel plate of such invention, yield-point is at most only about 250MPa.
On the other hand, consider from the viewpoint of lightweight or life estimation (LCA), when wanting to lower the steel usage quantity, for example require the above high yield strength of 250～300MPa, means a kind of or more than two kinds in solution strengthening, grain refining reinforcement, precipitation strength, the work strengthening need be made up, improve yield-point.But under any circumstance, along with the raising of yield-point, the rapid deterioration of geomagnetic shielding character, and in the occasion of high Si, the plate fracture takes place when rolling easily, productivity, yield rate all reduce, and therefore can not achieve the goal.
The objective of the invention is to, solve as the problem of above-mentioned conventional art, provide excellent geomagnetic shielding character, i.e. big high strength cold rolled steel plate and high strength plated steel sheet and the manufacture method thereof of specific permeability in the direct magnetic field about 0.3 oersted.And purpose is, provides the telochrome that uses these high strength cold rolled steel plates and high strength plated steel sheet with anti-explosion hoop or external magnetism shielding material.At this, so-called cold-rolled steel sheet and plated steel sheet are at the cold-rolled steel sheet that uses, do not carry out surface-treated narrow sense mainly as telochrome in purposes such as tame electrical article such as anti-explosion hoop or bearer frame or automobile, furniture, buildings, and comprise for antirust, for example plate the electroplating steel plate of Zn or Zn-Ni or hot-dip galvanized steel sheet, alloyed hot-dip galvanized steel plate, and and then for more improve press formability and antirust at coating alloying or the upper strata on implement the surface treated steel plate of organic coating processing etc.
The summary of invention
The present invention is that the specific permeability in the direct magnetic field of 0.3 oersted is the high strength cold rolled steel plate of the excellent geomagnetic shielding character more than 500, be by weight % contain that C:0.0003～0.0060%, Si:0.3～1.8%, Mn:0.2～1.8%, P:0.12% are following, S:0.001～0.012%, Al: be lower than 0.005%, below the N:0.0030%, and %Mn/%S 〉=60, all the other are made up of Fe and unavoidable impurities, and the ferrite crystal grain diameter is the high strength cold rolled steel plate (hereinafter referred to as the A cold-rolled steel sheet) of 200 μ m in its metal structure.
The present invention is that the specific permeability in the direct magnetic field of 0.3 oersted is the high strength cold rolled steel plate of the excellent geomagnetic shielding character more than 500, be that % contains C:0.0003～0.0060% by weight, Si:0.3～1.8%, Mn:0.2～1.8%, below the P:0.12%, S:0.001～0.012%, Al:0.005～0.04%, below the N:0.0030%, B:0.0010～0.0030%, and %Mn/%S 〉=60 and %B/%N 〉=0.5, all the other are made up of Fe and unavoidable impurities, and the ferrite crystal grain diameter is the high strength cold rolled steel plate (hereinafter referred to as the B cold-rolled steel sheet) of 10～200 μ m in its metal structure.
In addition, the present invention forms and top layer Si concentration is to implement the high strength plated steel sheet (hereinafter referred to as C or D plated steel sheet) that to electroplate specific permeability that obtain, in the direct magnetic field of 0.3 oersted be the excellent geomagnetic shielding character more than 500 on the cold-rolled steel sheet below the 5 weight % in identical chemical ingredients with A or B cold-rolled steel sheet.
Moreover, the present invention is that the specific permeability in the direct magnetic field of 0.3 oersted is the manufacture method of the high strength cold rolled steel plate of the excellent geomagnetic shielding character more than 500, the bloom slab that identical chemical ingredients with A or B cold-rolled steel sheet is formed carries out finish rolling at 750～980 ℃, carry out 60～90% cold rolling after, use continuous annealing apparatus more than 750 ℃, Ac 3The following temperature range of point is annealed, and perhaps then handles 300～450 ℃ of overaging of carrying out more than 120 seconds in this annealing back, makes the ferrite crystal grain diameter reach the manufacture method of the cold-rolled steel sheet of 10～200 μ m in its metal structure.
In addition, the present invention is to be to implement on the cold-rolled steel sheet below the 5 weight % that to electroplate specific permeability that obtain, in the direct magnetic field of 0.3 oersted be the high strength electroplating steel plate manufacture method of the excellent geomagnetic shielding character more than 500 in top layer Si concentration, the bloom slab that the chemical ingredients identical with C or D plated steel sheet formed 750～980 ℃ carry out finish rolling after, batching below 700 ℃, carry out 60～90% cold rolling, use continuous annealing apparatus then, carry out more than 750 ℃ below 0 ℃ at dew point, Ac with overaging band 3The annealing of the temperature range that point is following is perhaps then handled 300～450 ℃ of overaging of carrying out more than 120 seconds in this annealing back, makes the ferrite crystal grain diameter reach the manufacture method of the electroplating steel plate of 10～200 μ m in its metal structure.
Moreover, the present invention is to be to implement on the cold-rolled steel sheet below the 5 weight % that to electroplate specific permeability that obtain, in the direct magnetic field of 0.3 oersted be the high strength electroplating steel plate manufacture method of the excellent geomagnetic shielding character more than 500 in top layer Si concentration, the bloom slab that the chemical ingredients identical with C or D plated steel sheet formed 750～980 ℃ carry out finish rolling after, carry out 60～90% cold rolling after, the continuous hot-dipping galvanizing equipment that uses the annealing formula on continuous annealing apparatus or the production line more than 750 ℃, Ac 3The following temperature range of point is annealed, and uses perhaps that the continuous hot-dipping galvanizing equipment with the continuous annealing apparatus of overaging band or the annealing formula on the production line carries out more than 750 ℃, Ac 3Put the annealing of following temperature range and, in its metal structure, make the ferrite crystal grain diameter reach the manufacture method of the plated steel sheet of 10～200 μ m 300～450 ℃ of overaging processing of carrying out more than 120 seconds.
According to the present invention, can access that specific permeability in the direct magnetic field that is equivalent to about 0.3 oersted of earth magnetism is big, high strength cold rolled steel plate and the high strength plated steel sheet of excellent geomagnetic shielding character and the intensity Gao Bingcun that represents with yield-point.And use the continuous annealing apparatus identical or the continuous hot-dipping galvanizing equipment of the annealing formula on the production line easily to make with making steel sheet that punch process uses.
And then, when in the anti-explosion hoop of telochrome or bearer frame, using steel plate of the present invention, compare with goods in the past, high to the effect of vertical magnetic field, the quality that goes far towards telochrome improves.Moreover, according to steel plate of the present invention, can be applicable to that be in electrical article or automobile, furniture, building etc. use the steel-sheet extensive use, on industry, have great effect.
Simple declaration to accompanying drawing
Fig. 1 is the explanatory view about the quadrant A～D of table 4 (surface segmentation of cathode tube being become the mean value of 4 color shift amounts among quadrant A～D).
The best mode that carries out an invention
The inventor must solve above-mentioned problem, be conceived to for make specific permeability in the direct magnetic field that is equivalent to about 0.3 oersted of earth magnetism big with the intensity of yield-point representative high and deposit, use the following ultra-low carbon steel of C:0.0040%, do not relying on precipitation strength, do not making and carry out solution strengthening under the ferrite crystal grain refinement and be very important.So, furtherd investigate, found that, after based on the solution strengthening that utilizes Si, Mn, be in steel not residual in fact Al, utilize Si to carry out deoxidation, perhaps when utilizing Al to carry out deoxidation, by the B more than the certain proportion that adds relative N, can make the ferrite crystal grain diameter is 10～30 μ m, specific permeability in the direct magnetic field of 0.3 oersted is more than 500, excellent geomagnetic shielding character.
In addition, C is if surpass 0.0040%, because magnetic aging, geomagnetic shielding character just might the timeliness deterioration.On the other hand, at the addition of Si, Mn for a long time, it may not be easy below 0.0040% that C is reached, and having further improving of geomagnetic shielding character is the problem of difficulty.About these problems, the inventor has proceeded further research, found that, for the timeliness deterioration of the geomagnetic shielding character that prevents to cause by magnetic aging, S content relatively, it is effective making Mn content reach more than certain ratio, and then after annealing, to the cooling way of normal temperature, handle 300～450 ℃ of overaging of carrying out more than 120 seconds, be suitable.
The present invention finishes with regard to being based on such new knowledge, and is as follows as its main points.
(1) % by weight, contain that C:0.0003～0.0060%, Si:0.3～1.8%, Mn:0.2～1.8%, P:0.12% are following, S:0.001～0.012%, Al: be lower than 0.005%, below the N:0.0030%, and with %Mn, %S during respectively as Mn, S content, %Mn/%S 〉=60, all the other are made up of Fe and unavoidable impurities, the ferrite crystal grain diameter is 10～200 μ m in its metal structure, and the specific permeability in the direct magnetic field of 0.3 oersted is the high strength cold rolled steel plate of the excellent geomagnetic shielding character more than 500.
(2) % by weight, contain C:0.0003～0.0060%, Si:0.3～1.8%, Mn:0.2～1.8%, below the P:0.12%, S:0.001～0.012%, Al:0.005～0.04%, below the N:0.0030%, B:0.0010～0.0030%, and with %Mn, %S, %N, %B is respectively as Mn, S, N, during B content, %Mn/%S 〉=60, and %B/%N 〉=0.5, all the other are made up of Fe and unavoidable impurities, the ferrite crystal grain diameter is 10～200 μ m in its metal structure, and the specific permeability in the direct magnetic field of 0.3 oersted is the high strength cold rolled steel plate of the excellent geomagnetic shielding character more than 500.
(3) in above-mentioned (1) or (2) record, implement that plating obtains, the specific permeability in the direct magnetic field of 0.3 oersted is the high strength electroplating steel plate of the excellent geomagnetic shielding character more than 500 on the cold-rolled steel sheet of top layer Si concentration 5% below.
(4) specific permeability in the direct magnetic field of 0.3 oersted of record is the high strength plated steel sheet of the excellent geomagnetic shielding character more than 500 in above-mentioned (1) or (2).
(5) telochrome that uses steel plate of record in above-mentioned (1), (2), (3) or (4) is with anti-explosion hoop or external magnetism shielding material.
(6) bloom slab of being made up of chemical ingredients of record in above-mentioned (1) or (2) carries out finish rolling at 750～980 ℃, carry out 60～90% cold rolling after, the use continuous annealing apparatus more than 750 ℃, Ac 3The following temperature range of point is annealed, and the ferrite crystal grain diameter is 10～200 μ m in its metal structure, and the specific permeability in the direct magnetic field of 0.3 oersted is the manufacture method of the high strength cold rolled steel plate of the excellent geomagnetic shielding character more than 500.
(7) bloom slab of being made up of chemical ingredients of record in above-mentioned (1) or (2) carries out finish rolling at 750～980 ℃, carry out 60～90% cold rolling after, the continuous annealing apparatus that use has the overaging band carries out more than 750 ℃, Ac 3The annealing of the following temperature range of point and handle at 300～450 ℃, overaging more than 120 seconds, the ferrite crystal grain diameter is 10～200 μ m in its metal structure, and the specific permeability in the direct magnetic field of 0.3 oersted is the manufacture method of the high strength cold rolled steel plate of the excellent geomagnetic shielding character more than 500.
(8) in by above-mentioned (3) bloom slab formed of chemical ingredients of record 750～980 ℃ carry out finish rolling after, batching below 700 ℃, carry out 60～90% cold rolling after, the use continuous annealing apparatus carries out more than 750 ℃ at dew point below 0 ℃, Ac 3The annealing of the following temperature range of point, the ferrite crystal grain diameter is that the execution plating obtains on 10～200 μ m, the cold-rolled steel sheet of top layer Si concentration below 5%, the specific permeability in the direct magnetic field of 0.3 oersted is the manufacture method of the high strength electroplating steel plate of the excellent geomagnetic shielding character more than 500 in its metal structure.
(9) in by above-mentioned (3) bloom slab formed of chemical ingredients of record 750～980 ℃ carry out finish rolling after, batching below 700 ℃, carry out 60～90% cold rolling after, use that the continuous annealing apparatus with overaging band carries out more than 750 ℃ at dew point below 0 ℃, Ac 3The annealing of the following temperature range of point, continue then to handle 300～450 ℃ of overaging of carrying out more than 120 seconds, the ferrite crystal grain diameter is 10～200 μ m in its metal structure, and the execution plating obtains on the cold-rolled steel sheet of top layer Si concentration below 5%, the specific permeability in the direct magnetic field of 0.3 oersted is the manufacture method of the high strength electroplating steel plate of the excellent geomagnetic shielding character more than 500.
(10) bloom slab of forming by chemical ingredients of record in above-mentioned (4) 750～980 ℃ carry out finish rolling after, carry out 60～90% cold rolling, the continuous hot-dipping galvanizing equipment that uses the annealing formula on continuous annealing apparatus or the production line then more than 750 ℃, Ac 3The following temperature range of point is annealed, and the ferrite crystal grain diameter is 10～200 μ m in its metal structure, and the specific permeability in the direct magnetic field of 0.3 oersted is the manufacture method of the high strength plated steel sheet of the excellent geomagnetic shielding character more than 500.
(11) bloom slab of being made up of the chemical ingredients of record in above-mentioned (4) carries out finish rolling at 750～980 ℃, carry out 60～90% cold rolling after, use that the continuous hot-dipping galvanizing equipment with the continuous annealing apparatus of overaging band or the annealing formula on the production line carries out more than 750 ℃, Ac 3The annealing of the following temperature range of point and handle at 300～450 ℃, overaging more than 120 seconds, the ferrite crystal grain diameter is 10～200 μ m in its metal structure, and the specific permeability in the direct magnetic field of 0.3 oersted is the manufacture method of the high strength plated steel sheet of the excellent geomagnetic shielding character more than 500.
Below, explain the present invention.
At first, narration is C, Si, Mn, P, S, the Al of main adding elements, the numerical definiteness reason of B, N.
C is the element of the utmost importance that improves yield-point by solution strengthening or precipitation strength.As feature of the present invention, relative S content, though make Mn content reach certain ratio, but do not carrying out the occasion that overaging is handled, if surpass 0.0040%, even perhaps the annealing back is handling 300～450 ℃ of overaging of carrying out more than 120 seconds to the cooling way of normal temperature, if surpass 0.0060%, follow separating out of the thin carbide that produces in timeliness, deterioration just takes place in geomagnetic shielding character.On the other hand, make C be lower than 0.0003%, need the extremely long time in vacuum outgas, manufacturing cost increases significantly, is not good therefore.
Si is changing under the ferrite crystal grain diameter indistinctively, carries out solid solution in crystallization, and the replacement of fe atom makes lattice distortion, thereby improves yield-point.On the other hand, little to the baneful influence of geomagnetic shielding character, be purpose therefore to improve yield-point, add the Si more than 0.3%.Being treated to purpose to omit overaging especially, is 0.0040% when following at C content, in order to want to make yield-point surpass 300MPa, wishes the Si of interpolation more than 1.0%.Yet its addition just produces inner oxide layer if surpass 1.8% on the top layer of steel plate, becomes a reason of surface imperfection.In addition, form SiO on the top layer 2Film, plating tack deterioration when carrying out galvanizing not only, and also deterioration significantly of plating property.
Mn is identical with Si, is changing indistinctively under the ferrite crystal grain diameter, carries out solid solution in crystallization, and the replacement of fe atom makes lattice distortion, thereby improves yield-point.On the other hand, little to the baneful influence of geomagnetic shielding character, be purpose therefore to improve yield-point, add more than 0.2%.Yet its addition is if surpass 1.8%, the just significant refinement of ferrite crystal grain, and geomagnetic shielding character deterioration significantly not only, and also in order to be in the scope of the invention with the C amount and to deposit, it is high that cost becomes.And, during respectively as Mn, S content, need reach %Mn/%S 〉=60 with %Mn, %S for the deterioration of the geomagnetic shielding character that suppresses to cause by timeliness.In %Mn/%S＜60 o'clock, do not depend on C content or have or not overaging to handle, for example the ageing treatment by carrying out 2 hours at 200 ℃ just reduces specific permeability greatly, and hence one can see that, produces the deterioration of the geomagnetic shielding character that is caused by timeliness.
Therefore P makes the ferrite crystal grain refinement, compares with Si or Mn as identical solution strengthening element, and is big to the baneful influence of geomagnetic shielding character.Improve the occasion of yield strength especially at needs, if compare with precipitation strength or work strengthening, the deterioration of geomagnetic shielding character can allow, and therefore can be added into maximum 0.12%.Its addition is if surpass 0.12%, the just significant refinement of ferrite crystal grain, and geomagnetic shielding character deterioration greatly not only, and also center segregation is also remarkable, thereby the cold-rolling property deterioration.And in picture ultra-low carbon steel plate of the present invention, and if Si volume ground add P together, embrittlement just significantly, (the 0.12-0.04 * %Si) below the % that for fear of this embrittlement, with %Si during, wishes that the addition of P reaches as the addition of Si.
S forms MnS, hinders moving of neticdomain wall, and grows up owing to suppressing ferrite crystal grain, thus the geomagnetic shielding character deterioration, so the upper limit is 0.012%.On the other hand, being lower than at 0.001% o'clock, making manufacturing cost reach high, is not good therefore.
Al generally uses for deoxidation, but separates out tiny AlN, and hinders moving of neticdomain wall, and suppresses ferrite crystal grain and grow up, so the geomagnetic shielding character deterioration.Thereby cannot be in order to catch O, and become superfluous interpolation, in steel, to implement not remainingly, can reach and be lower than 0.005%.Yet, when adding Si, the Al addition is reached is lower than 0.005% situation that also has cost to become high, when relative N adds a certain amount of above B, in order not see its baneful influence, so add more than 0.005%, carrying out sufficient deoxidation, just improve surface shape, is suitable.On the other hand, if surpass 0.04%, not only the baneful influence to geomagnetic shielding character is big, and also deterioration of surface shape.
N forms tiny precipitate, hinders moving of neticdomain wall, and therefore the deterioration geomagnetic shielding character is defined as below 0.0030%.And N and Al form compound, thereby when hindering the moving of neticdomain wall, suppress ferrite crystal grain and grow up, and therefore in steel during remaining Al, the present invention by adding B, separates out as BN especially, suppresses the deterioration of geomagnetic shielding character.
During remaining Al, B is epochmaking element, by forming BN, suppresses tiny AlN and separates out, and adds with the purpose of improving geomagnetic shielding character in steel.Its addition is more than 0.0010%, and %N, %B be during respectively as N, B content, and %B/%N 〉=0.5 o'clock reaches this purpose.On the other hand, spend at 0.0030% o'clock, grow up, not equal to therefore the deterioration geomagnetic shielding character must be avoided suppress ferrite crystal grain at B ultrasonic.
Ti, Nb, Cu, Sn, Zn, Zr, Mo, W, Cr, Ni etc. contain as unavoidable impurities, but in order to make as the geomagnetic shielding character and the high strength of the object of the invention and to deposit, these elements are disadvantageous, and its content preferably is lower than 0.3% by amounting to.
Then, the qualification reason of creating conditions of narration steel plate of the present invention.
Have no particular limits for the hot rolled bloom slab.That is, can be continuous casting bloom slab or the bloom slab made with thin bloom slab casting etc.And also be suitable for after casting, directly carrying out hot rolled continuous casting-without the technology of rolling (CC-DR) of centre heating.The hot rolled condition has no particular limits.
The hot rolled finishing temperature is 750～980 ℃.When finishing temperature is lower than 750 ℃, the tissue of remaining non-recrystallization state, when worsening cold-rolling property, the ferrite crystal grain after cold rolling, the annealing is not easy to reach more than the 10 μ m magnetic shield property deterioration.On the other hand, for finishing hot rolling in the temperature that surpasses 980 ℃, the Heating temperature that need raise significantly, this is disadvantageous.Especially the ferrite crystal grain viewpoint of growing up easily after cold rolling, the annealing, hope are more than 800 ℃, Ac 3Below the point.Method of cooling after the hot rolling and coiling temperature do not add special restriction, but because pickling deterioration that the increase of iron scale thickness causes and Si are to denseization on top layer, when carrying out galvanizing, plating tack deterioration not only, and also deterioration significantly of plating property, for fear of above-mentioned deterioration, hope is below 700 ℃.
Cold rolling can be common condition, especially considers that from the purpose of the pickling of carrying out iron scale expeditiously its rolling rate is more than 60%.On the other hand, cold rolling to carry out above 90% rolling rate, need very big cold rolling load, be unpractical therefore.
When using the continuous hot-dipping galvanizing equipment of the annealing formula on continuous annealing apparatus or the production line to anneal, its annealing temperature is more than 750 ℃, Ac 3Below the point.When annealing temperature was lower than 750 ℃, recrystallize was insufficient, remaining worked structure, thereby geomagnetic shielding character deterioration significantly.Geomagnetic shielding character with annealing temperature raise, ferrite crystal grain is grown up and improve, but is surpassing Ac 3The temperature of point is annealed, if produce the duplex grain structure that is caused by phase transformation, just reduces, and therefore need avoid.In the many occasions of Si content, Si is to denseization of top layer when annealing especially, if top layer Si concentration becomes more than 5%, therefore plating property is preferably in dew point and anneals below 0 ℃ with regard to deterioration.In addition, C content is as if surpassing 0.0040%, because magnetic aging just causes the timeliness deterioration of geomagnetic shielding character easily, therefore hope to the cooling way of room temperature, is handled 300～450 ℃ of overaging of carrying out more than 120 seconds after annealing.If the temperature that overaging is handled surpasses 450 ℃, perhaps separating out of C was just insufficient, separates out tiny carbide in the use at normal temperatures imperceptibly less than 120 seconds its time, produced the timeliness deterioration of geomagnetic shielding character.On the other hand, if the temperature that overaging is handled is lower than 300 ℃, the carbide of separating out during this period is with regard to refinement, even the therefore state after just making, geomagnetic shielding character is ungood yet.
After this, as required,,, and then implement organic coating processing etc. thereon, also do not see influence as the geomagnetic shielding character of feature of the present invention even for example implement the surface treatments such as alloy plating of plating Zn or Zn-Ni etc. for antirust.
In addition, after the annealing, along with the cutting off of skin rolling or steel plate, to the processing of component shape, specific permeability in the direct magnetic field about about 0.3 oersted reduces, but the anti-explosion hoop of telochrome or bearer frame, owing to the thermal contraction when about 600 ℃ are forced to cool off is compressed, promptly use at the shrink-on state, therefore additional strain is liberated mostly in 600 ℃ of processes of carrying out reheat, geomagnetic shielding character, promptly the state after specific permeability in the direct magnetic field about about 0.3 oersted and the annealing just is very different.That is to say excellent geomagnetic shielding character and can and deposit with the intensity height of yield-point representative.
Embodiment 1
According to the condition shown in the table 2, will be thick by becoming the steel be grouped into be rolled into 3.0～6.0mm shown in the table 1, carry out pickling, cold rolling, form the thick cold-rolled steel strip of 0.7～1.6mm after, use continuous annealing apparatus to carry out the thermal treatment of condition as shown in table 2, carry out the skin rolling of unit elongation 0.3% again.From the steel band of making like this, along being parallel to rolling direction, cut the JIS5 sample, carry out the tension test under the normal temperature, obtain yield strength (YP), tensile strength (TS).Make up the sample of the 30mm * 300mm that cuts from same steel band in addition, utilize direct current Epstein iron loss assay method, obtain the specific permeability in the direct magnetic field of 0.3 oersted according to JISC2550.And, investigate its timeliness deterioration thus 200 ℃ of mensuration of carrying out specific permeability after carrying out 2 hours ageing treatment again.With after the section corrosion, carry out observation by light microscope for 100 times again, obtain the median size of ferrite crystal grain with multiplying power.Compiling these the results are shown in the table 2.
Can know clearly from table 2, have specified chemical composition of the present invention, the ferrite crystal grain diameter is that sample No.1,2,4,7,8,10,12,19,27,28,31,33,35 yield-points of 10～200 μ m are more than the 300MPa, in the direct magnetic field of 0.3 oersted, has simultaneously the specific permeability more than 500, do not see its timeliness deterioration, so high strength and excellent geomagnetic shielding character and deposit.In contrast, have specified chemical composition of the present invention, make with suitable hot rolling, cold rolling condition, even annealing temperature is also suitable, surpass at 0.0040% o'clock at C, if the condition that overaging is handled is not suitable for, geomagnetic shielding character is also deterioration just.For example as sample No.32, even the state after just having made, specific permeability is also little, and geomagnetic shielding character is bad, and perhaps as sample No.25,26,29,34, after just making, specific permeability is all bigger, along with timeliness geomagnetic shielding character deterioration.
In addition, even have specified chemical composition of the present invention, rolling condition is not suitable for, picture sample No.9,11,15,30,36, the ferrite crystal grain diameter in the scope of 10～200 μ m, does not comprise non-recrystallization crystal grain, when becoming duplex grain structure especially, specific permeability in the direct magnetic field of 0.3 oersted is less than 500, and geomagnetic shielding character is ungood.As sample No.5,6,13,14, surpass 5% in addition, most evilization of plating property as if top layer Si concentration.
On the other hand, as sample No.7,37, %Mn/%S is lower than 60 steel, even carry out handling according to overaging of the present invention, the timeliness deterioration of specific permeability is also big.As sample No.24, at Si content for a long time, even the steel beyond the composition of the present invention, yield-point is also high in addition, and specific permeability is also big, also can realize its not timeliness deterioration, but therefore plating property deterioration can not extensively be utilized as mechanicals.In addition, steel beyond the composition of the present invention, picture sample No.16,17, in the direct magnetic field of 0.3 oersted, even have the specific permeability more than 500, also be difficult to obtain the above yield-point of 300MPa, perhaps as sample No.18,20～23, though yield-point is more than the 300MPa, but be difficult to make the ferrite crystal grain diameter to reach 10～200 μ m, in addition as sample No.38, if C surpasses 0.0060%, specific permeability in the direct magnetic field of 0.3 oersted just is lower than 500, so geomagnetic shielding character is ungood.
Embodiment 2
According to the condition shown in the table 3, will by become the steel C be grouped into shown in the table 1, that D is rolled into 4.5～6.0mm is thick, carry out pickling, cold rolling one-tenth 1.0～1.6mm is thick, use the continuous hot-dipping galvanizing equipment of the annealing formula on the production line to carry out the thermal treatment of condition as shown in table 2 on one side then, form the steel band that adheres to galvanizing on its top layer on one side, again this steel band is carried out the skin rolling of unit elongation 0.3%.From the steel band of making like this, cut the JIS5 sample along being parallel to rolling direction, carry out the tension test under the normal temperature, obtain yield strength (YP), tensile strength (TS).Make up the sample of the 30mm * 300mm that cuts from same steel band in addition, utilize direct current Epstein iron loss assay method, obtain the specific permeability in the direct magnetic field of 0.3 oersted according to JISC2550.And, investigate its timeliness deterioration thus 200 ℃ of mensuration of carrying out specific permeability after carrying out 2 hours ageing treatment again.With after the section corrosion, carry out observation by light microscope for 100 times again, obtain the median size of ferrite crystal grain with multiplying power.Compiling it the results are shown in the table 3.
Can know clearly from table 3, have specified chemical composition of the present invention, the ferrite crystal grain diameter is that sample No.1,2,4,5 yield-points of 10～200 μ m are the above high strength cold rolled steel plates of 300MPa, in the direct magnetic field of 0.3 oersted, has simultaneously the specific permeability more than 500, excellent geomagnetic shielding character.In contrast, picture sample No.3,6, though have specified chemical composition of the present invention, but rolling condition is improper, the ferrite crystal grain diameter in the scope of 10-200 μ m, does not especially comprise non-recrystallization crystal grain, perhaps when becoming duplex grain structure, specific permeability in the direct magnetic field of 0.3 oersted is lower than 500, and geomagnetic shielding character is ungood.
Embodiment 3
Use the steel G (steel of the present invention) and the steel Q (comparative steel) of table 1, manufacture electroplating steel plate with creating conditions shown in the sample sequence number 12 (example of the present invention) of table 2 and 30 (comparative examples) respectively, the geomagnetic shielding character when these electroplating steel plates are used in telochrome with anti-explosion hoop or external magnetism shielding material is estimated.
The evaluation of geomagnetic shielding character is carried out based on following method.
Under the environment that adds 0.35 oersted vertical magnetic field and 0.3 oersted horizontal magnetic field, with telochrome successively eastwards/west/south/northern break-in, will be decided to be Bh from the color shift gauge of the electron beam of the reference point under all directions.The color shift gauge of the electron beam the when vertical time under the 0 oersted horizontal magnetic field is varied to 0.35 oersted is decided to be Bv.Absolute value separately is more little, and the color shift amount is few more, and the geomagnetic shielding character of expression telochrome is good more.
The evaluation result of geomagnetic shielding character is shown in Table 4.Can know clearly that from the result of table 4 Bh and Bv about 21 types and the 36 type telochromes of example of the present invention are used the quadrant A～D in the anti-explosion hoop compare with relevant comparative example, all show the value that its absolute value is little, have sought improvement.Can confirm that thus according to telochrome of the present invention, the color shift amount is few, geomagnetic shielding is good.
Moreover, about the quadrant A～D of table 4, its explanation of expression in Fig. 1.And in table 4, improvement rate (%) is so that improvement rate (%)=(comparative example-example of the present invention)/comparative example * 100 are represented.[table 1]
Steel grade Chemical constitution (weight %) ?Mn ?/ ?S ???B ???/ ???N Example
????C ????Si ????Mn ????P ????S ??Al ????N ????B
?A ???????0.0009 ?1.41 ?????0.63 ?0.056 ?0.0064 ?0.002 ?0.0017 ?- ?98.4 ?- Example of the present invention
?B ???????0.0017 ?0.85 ?????0.56 ?0.083 ?0.0105 ?0.001 ?0.0017 ?- ?53.3 ?- Comparative example
?C ???????0.0016 ?1.10 ?????1.00 ?0.053 ?0.0035 ?0.038 ?0.0022 ?0.0023 ?285.7 ?1.0 Example of the present invention
?D ???????0.0018 ?1.01 ?????1.02 ?0.078 ?0.0048 ?0.003 ?0.0016 ?- ?212.5 ?- Example of the present invention
?E ???????0.0022 ?1.73 ?????0.88 ?0.050 ?0.0065 ?0.001 ?0.0025 ?- ?135.4 ?- Example of the present invention
?F ???????0.0026 ?1.23 ?????1.36 ?0.043 ?0.0080 ?0.034 ?0.0019 ?0.0011 ?170.0 ?0.6 Example of the present invention
?G ???????0.0026 ?1.39 ?????0.81 ?0.039 ?0.0057 ?0.004 ?0.0022 ?- ?142.1 ?- Example of the present invention
?H ???????0.0027 ?0.24 ?????0.92 ?0.053 ?0.0076 ?0.021 ?0.0025 ?0.0014 ?121.1 ?0.6 Comparative example
?I ???????0.0028 ?1.18 ?????0.15 ?0.039 ?0.0051 ?0.002 ?0.0024 ?- ?29.4 ?- Comparative example
?J ???????0.0029 ?1.23 ?????2.06 ?0.047 ?0.0097 ?0.045 ?0.0023 ?0.0015 ?212.4 ?0.7 Comparative example
?K ???????0.0029 ?0.70 ?????1.53 ?0.052 ?0.0036 ?0.038 ?0.0020 ?0.0012 ?425.0 ?0.6 Example of the present invention
?L ???????0.0030 ?0.65 ?????1.41 ?0.135 ?0.0092 ?0.032 ?0.0021 ?0.0014 ?153.3 ?0.7 Comparative example
?M ???????0.0032 ?0.67 ?????1.47 ?0.062 ?0.0051 ?0.065 ?0.0028 ?- ?288.2 ?- Comparative example
?N ???????0.0032 ?0.73 ?????1.48 ?0.069 ?0.0067 ?0.036 ?0.0018 ?0.0004 ?220.9 ?0.2 Comparative example
?O ???????0.0034 ?0.71 ?????1.39 ?0.051 ?0.0042 ?0.025 ?0.0026 ?0.0042 ?331.0 ?1.6 Comparative example
?P ???????0.0036 ?1.83 ?????0.88 ?0.039 ?0.0036 ?0.002 ?0.0023 ?- ?244.4 ?- Comparative example
?Q ???????0.0042 ?1.39 ?????0.25 ?0.034 ?0.0038 ?0.042 ?0.0028 ?0.0017 ?65.8 ?0.6 Example of the present invention
?R ???????0.0047 ?0.88 ?????1.61 ?0.052 ?0.0045 ?0.002 ?0.0027 ?- ?357.8 ?- Example of the present invention
?S ???????0.0052 ?1.15 ?????0.45 ?0.069 ?0.0092 ?0.035 ?0.0016 ?0.0014 ?48.9 ?0.9 Comparative example
?T ???????0.0085 ?1.19 ?????1.46 ?0.052 ?0.0077 ?0.002 ?0.0018 ?- ?189.6 ?- Comparative example
(notes) digital underscore is [table 2] beyond the scope of the invention
The sample sequence number Steel grade Hot rolling finishing temperature (℃) Coiling temperature (℃) Hot rolling finishes thickness of slab (mm) Goods thick (mm) Cold rolling rate (%) Annealing temperature (℃) Dew point during annealing (℃) The overaging temperature (℃) The overaging time (second)
????1 ?A ????890 ????640 ????4.0 ??1.0 ????75 ????820 ????-5 ?360～430 ????130
????2 ?A ????880 ????650 ????6.0 ??1.0 ????84 ????880 ????-5 ?380～430 ????200
????3 ?B ????910 ????630 ????4.0 ??1.2 ????70 ????780 ????-10 ?360～430 ????130
????4 ?E ????810 ????590 ????4.5 ??1.2 ????73 ????840 ????-5 ?360～440 ????220
????5 ?E ????820 ????550 ????4.0 ??1.0 ????75 ????840 ????20 ?360～410 ????140
????6 ?E ????850 ????730 ????3.5 ??1.0 ????71 ????860 ????10 ?370～430 ????160
????7 ?F ????850 ????600 ????3.5 ??0.8 ????77 ????880 ????-15 ?360～410 ????160
????8 ?F ????870 ????620 ????4.5 ??1.0 ????78 ????840 ????-5 ?460～480 ????160
????9 ?F ????870 ????620 ????4.5 ??1.2 ????73 ????960 ????-10 ?370～410 ????160
????10 ?F ????960 ????580 ????4.0 ??1.0 ????75 ????880 ????-5 ?370～440 ????180
????11 ?F ????730 ????570 ????6.0 ??1.4 ????77 ????880 ????-5 ?350～380 ????150
????12 ?G ????870 ????640 ????6.0 ??1.6 ????73 ????880 ????-5 ?320～390 ????140
????13 ?G ????870 ????640 ????6.0 ??1.6 ????73 ????840 ????30 ?350～420 ????150
????14 ?G ????900 ????760 ????4.5 ??1.2 ????73 ????860 ????-5 ?340～380 ????250
????15 ?G ????910 ????650 ????6.0 ??1.2 ????80 ????740 ????-10 ?370～430 ????150
????16 ?H ????830 ????640 ????4.0 ??1.2 ????70 ????880 ????-10 ?330～390 ????150
????17 ?I ????880 ????680 ????4.0 ??1.0 ????75 ????880 ????-15 ?360～410 ????180
????18 ?J ????830 ????610 ????4.5 ??0.8 ????82 ????880 ????-5 ?350～400 ????150
????19 ?K ????830 ????600 ????4.0 ??1.2 ????70 ????880 ????-5 ?350～390 ????130
????20 ?L ????880 ????530 ????5.0 ??1.4 ????72 ????880 ????-5 ?350～390 ????150
????21 ?M ????830 ????590 ????4.0 ??1.0 ????75 ????880 ????-10 ?350～380 ????140
????22 ?N ????830 ????660 ????5.0 ??1.6 ????68 ????880 ????-5 ?370～390 ????160
????23 ?O ????830 ????570 ????3.0 ??0.7 ????77 ????880 ????-5 ?350～420 ????180
????24 ?P ????810 ????640 ????3.5 ??1.2 ????66 ????840 ????-5 ?360～410 ????160
????25 ?Q ????850 ????650 ????4.0 ??1.0 ????75 ????820 ????-15 ?360～420 ????80
????26 ?Q ????850 ????650 ????4.0 ??1.2 ????70 ????800 ????-10 ?480～530 ????250
????27 ?Q ????850 ????620 ????3.5 ??1.0 ????71 ????820 ????-20 ?320～390 ????140
????28 ?Q ????880 ????610 ????4.5 ??1.6 ????64 ????900 ????-5 ?320～390 ????180
????29 ?Q ????880 ????570 ????4.0 ??0.8 ????80 ????820 ????-5 ?180～250 ????180
????30 ?Q ????880 ????600 ????4.5 ??1.2 ????73 ????700 ????-10 ?370～430 ????150
????31 ?R ????830 ????560 ????4.5 ??1.2 ????73 ????880 ????-10 ?350～390 ????150
????32 ?R ????830 ????540 ????4.5 ??1.2 ????73 ????880 ????-5 ?200～260 ????170
????33 ?R ????830 ????640 ????4.5 ??1.2 ????73 ????800 ????-20 ?350～380 ????140
????34 ?R ????840 ????630 ????5.5 ??1.6 ????71 ????860 ????-10 ?350～410 ????60
????35 ?R ????930 ????600 ????4.0 ??1.0 ????75 ????880 ????-15 ?350～420 ????180
????36 ?R ????730 ????550 ????4.0 ??0.8 ????80 ????860 ????-5 ?380～440 ????130
????37 ?S ????890 ????620 ????5.5 ??1.2 ????78 ????820 ????-10 ?350～400 ????150
????38 ?T ????830 ????580 ????4.5 ??1.2 ????73 ????880 ????-5 ?380～440 ???130
(notes) digital underscore is that [table 2] is continuous beyond the scope of the invention
The sample sequence number Steel grade Crystal grain diameter (μ m) Yield-point (MPa) Tensile strength (MPa) Unit elongation (%) Specific permeability Specific permeability after 200 ℃ * 2 hours timeliness Top layer Si concentration (%) Plating property Example
????1 ?A ????22 ??329 ????485 ????37 ????680 ????670 ????2 Well Example of the present invention
????2 ?A ????25 ??326 ????478 ????38 ????690 ????690 ????1.9 Well Example of the present invention
????3 ?B ????15 ??334 ????465 ????37 ????530 ????480 ????1.1 Well Comparative example
????4 ?E ????26 ??366 ????510 ????37 ????590 ????600 ????2.5 Well Example of the present invention
????5 ?E ????25 ??369 ????509 ????36 ????540 ????540 ????6.4 Bad Comparative example
????6 ?E ????21 ??373 ????510 ????36 ????510 ????500 ????5.4 Bad Comparative example
????7 ?F ????22 ??337 ????488 ????39 ????660 ????650 ????1.3 Well Example of the present invention
????8 ?F ????18 ??345 ????494 ????36 ????540 ????420 ????1.9 Well Example of the present invention
????9 ?F ????8 ??325 ????497 ????41 ????470 ????470 ????1.5 Well Comparative example
????10 ?F ????19 ??342 ????495 ????39 ????590 ????580 ????1.8 Well Example of the present invention
????11 ?F ????8 ??455 ????633 ????7 ????150 ????150 ????1.7 Well Comparative example
????12 ?G ????27 ??347 ????496 ????39 ????620 ????600 ????2.2 Well Example of the present invention
????13 ?G ????23 ??357 ????500 ????37 ????560 ????540 ????6.2 Bad Comparative example
????14 ?G ????18 ??365 ????502 ????36 ????520 ????500 ????5.1 Bad Comparative example
????15 ?G ????7 ??480 ????587 ????14 ????400 ????390 ????2 Well Comparative example
????16 ?H ????28 ??235 ????360 ????48 ????650 ????640 ????0.3 Well Comparative example
????17 ?I ????29 ??296 ????432 ????43 ????680 ????670 ????1.4 Well Comparative example
????18 ?J ????7 ??349 ????525 ????35 ????450 ????480 ????1.8 Well Comparative example
????19 ?K ????29 ??302 ????449 ????43 ????780 ????760 ????1.1 Well Example of the present invention
????20 ?L ????8 ??341 ????502 ????36 ????410 ????400 ????0.8 Well Comparative example
????21 ?M ????7 ??309 ????458 ????43 ????430 ????430 ????0.8 Well Comparative example
????22 ?N ????9 ??312 ????464 ????44 ????480 ????470 ????1.2 Well Comparative example
????23 ?O ????7 ??335 ????496 ????37 ????420 ????420 ????1 Well Comparative example
????24 ?P ????28 ??371 ????516 ????33 ????670 ????680 ????5.2 Bad Comparative example
????25 ?Q ????29 ??334 ????471 ????36 ????790 ????490 ????1.5 Well Comparative example
????26 ?Q ????26 ??335 ????472 ????35 ????730 ????470 ????1.7 Well Comparative example
????27 ?Q ????30 ??330 ????472 ????36 ????810 ????800 ????1.3 Well Example of the present invention
????28 ?Q ????38 ??326 ????465 ????38 ????1060 ????1080 ????2 Well Example of the present invention
????29 ?Q ????28 ??334 ????476 ????35 ????650 ????450 ????1.9 Well Comparative example
????30 ?Q ????5 ??495 ????633 ????9 ????140 ????140 ????1.6 Well Comparative example
????31 ?R ????28 ??308 ????453 ????38 ????780 ????790 ????1.2 Well Example of the present invention
????32 ?R ????20 ??313 ????453 ????37 ????490 ????410 ????1.4 Well Comparative example
????38 ?R ????16 ??332 ????461 ????37 ????580 ????580 ????0.9 Well Example of the present invention
????34 ?R ????25 ??319 ????455 ????37 ????670 ????460 ????1.1 Well Comparative example
????35 ?R ????24 ??312 ????450 ????37 ????640 ????660 ????1 Well Example of the present invention
????36 ?R ????7 ??343 ????463 ????35 ????360 ????340 ????1.2 Well Comparative example
????37 ?S ????17 ??311 ????435 ????39 ????660 ????460 ????1.5 Well Comparative example
????38 ?T ????18 ??414 ????545 ????32 ????320 ????270 ????1.7 Well Comparative example
Beyond the basic invention scope of (notes) digital underscore [table 3]
The sample sequence number Steel grade Hot rolling finishing temperature (℃) Hot rolling finishes thickness of slab (mm) Goods thick (mm) Cold rolling rate (%) Annealing temperature (℃) The overaging temperature (℃) The overaging time (second)
????1 ?C ????900 ????6.0 ????1.0 ????84 ????780 ?340～400 ????140
????2 ?C ????870 ????6.0 ????1.6 ????73 ????840 ?320～440 ????25
????3 ?C ????870 ????6.0 ????1.6 ????73 ????960 ?320～440 ????40
????4 ?D ????890 ????4.5 ????1.4 ????69 ????880 ?320～440 ????25
????5 ?D ????890 ????4.5 ????1.2 ????73 ????800 ?320～440 ????20
????6 ?D ????890 ????4.5 ????1.2 ????73 ????720 ?320～440 ????25
(notes) digital underscore is that [table 3] is continuous beyond the scope of the invention
The sample sequence number Steel grade Crystal grain diameter (μ m) Yield-point (MPa) Tensile strength (MPa) Unit elongation (%) Specific permeability Specific permeability after 200 ℃ * 2 hours timeliness Example
????1 ?C ????19 ????325 ????455 ??37 ????590 ????590 Example of the present invention
????2 ?C ????24 ????317 ????446 ??37 ????640 ????630 Example of the present invention
????3 ?C ????9 ????364 ????461 ??35 ????430 ????430 Comparative example
????4 ?D ????25 ????320 ????457 ??39 ????650 ????640 Example of the present invention
????5 ?D ????17 ????335 ????468 ??37 ????570 ????570 Example of the present invention
????6 ?D ????4 ????428 ????710 ??6 ????130 ????130 Comparative example
(notes) digital underscore is the mean value that the surface of [table 4] cathode tube beyond the scope of the invention is divided into 4 color shift amounts among quadrant A～D
Example Sample sequence number (table 2) 21 type telochromes 36 type telochromes
??Bh(μm) ?????????????????Bv(μm) ??Bh(μm) ???????????????Bv(μm)
A ?B ??A ??B ??C ??D ?A ?B ??A ??B ??C ??D
Example of the present invention 12 (G steel) 29 ?27 -40 -31 -35 -57 ?75 ?65 -49 -53 ??-33 ??-65
Example of the present invention 30 (Q steel) 29 ?30 -53 -45 -49 -75 ?76 ?75 -66 -73 ??-44 ??-85
Improvement rate (%) 0 ?10 25 31 29 24 ?1 ?13 26 27 ??25 ??24

Claims (6)

1.. the high strength cold rolled steel plate of excellent geomagnetic shielding character, it is characterized in that, % by weight, contain C:0.0003～0.0060%, Si:0.3～1.8%, Mn:0.2～1.8%, below the P:0.12%, S:0.001～0.012%, Al:0.005～0.04%, below the N:0.0030%, B:0.0010～0.0030%, and with %Mn, %S, %N, %B is respectively as Mn, S, N, during B content, %Mn/%S 〉=60, and %B/%N 〉=0.5, all the other are made up of Fe and unavoidable impurities, the ferrite crystal grain diameter is 10～200 μ m in its metal structure, and the specific permeability in the direct magnetic field of 0.3 oersted is more than 500.
The described high strength cold rolled steel plate of claim 1 the preparation excellent geomagnetic shielding character the high strength electroplating steel plate in purposes.
The described high strength cold rolled steel plate of claim 1 the preparation excellent geomagnetic shielding character the high strength plated steel sheet in purposes.
4. the telochrome of the described steel plate of claim 1 is with anti-explosion hoop or external magnetism shielding material.
5. the manufacture method of the high strength cold rolled steel plate of excellent geomagnetic shielding character, it is characterized in that, the bloom slab of being made up of the described chemical ingredients of claim 1 is 750～980 ℃ of finish rolling, carry out 60～90% cold rolling after, use continuous annealing apparatus more than 750 ℃, Ac 3The following temperature range of point is annealed, and the ferrite crystal grain diameter is 10～200 μ m in its metal structure, and the specific permeability in the direct magnetic field of 0.3 oersted is more than 500.
6. the manufacture method of the high strength cold rolled steel plate of the described excellent geomagnetic shielding character of claim 5 is characterized in that, the continuous annealing apparatus that use has the overaging band carries out more than 750 ℃, Ac 3The annealing of the following temperature range of point and handle at 300～450 ℃, overaging more than 120 seconds.
CNB011211296A 1997-11-05 2001-06-05 High-strength cold-rolled steel sheet with excellent geomagnetic shielding character, its producing mehtod and use Expired - Fee Related CN1134551C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP30263197A JP2002012956A (en) 1997-11-05 1997-11-05 Cold rolled steel sheet and plated steel sheet both with high strength, superior in shielding property from earth magnetism, and manufacturing method therefor
JP302631/1997 1997-11-05
JP302631/97 1997-11-05
JP65055/1998 1998-03-16
JP65055/98 1998-03-16
JP06505598A JP4180685B2 (en) 1998-03-16 1998-03-16 High strength electroplating plate, electroplated steel plate excellent in geomagnetic shielding and plating adhesion, and manufacturing method thereof

Related Parent Applications (1)

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CN98803063A Division CN1078625C (en) 1997-11-05 1998-10-30 High-strength cold rolled steel sheet and high-strength plated steel sheet which have excellent geomagnetism shielding characteristics, and method of mfg. them

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CN1361305A true CN1361305A (en) 2002-07-31
CN1134551C CN1134551C (en) 2004-01-14

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CN98803063A Expired - Fee Related CN1078625C (en) 1997-11-05 1998-10-30 High-strength cold rolled steel sheet and high-strength plated steel sheet which have excellent geomagnetism shielding characteristics, and method of mfg. them
CNB011211288A Expired - Fee Related CN1134550C (en) 1997-11-05 2001-06-05 Method for producing high-strength electroplating steel plate and plating steel plate with excellent geomagnetic shielding character
CNB011211296A Expired - Fee Related CN1134551C (en) 1997-11-05 2001-06-05 High-strength cold-rolled steel sheet with excellent geomagnetic shielding character, its producing mehtod and use

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CN98803063A Expired - Fee Related CN1078625C (en) 1997-11-05 1998-10-30 High-strength cold rolled steel sheet and high-strength plated steel sheet which have excellent geomagnetism shielding characteristics, and method of mfg. them
CNB011211288A Expired - Fee Related CN1134550C (en) 1997-11-05 2001-06-05 Method for producing high-strength electroplating steel plate and plating steel plate with excellent geomagnetic shielding character

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CN (3) CN1078625C (en)
GB (1) GB2336601B (en)
WO (1) WO1999023268A1 (en)

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JP5121225B2 (en) * 2006-12-27 2013-01-16 日新製鋼株式会社 Manufacturing method of high strength plated steel sheet for spot welding with excellent magnetic shielding
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CN110114489B (en) * 2016-12-20 2021-09-07 Posco公司 Non-oriented electrical steel sheet and method for manufacturing the same
US11162155B2 (en) 2016-12-20 2021-11-02 Posco Non-oriented electrical steel sheet and method for producing same

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GB9915556D0 (en) 1999-09-01
CN1078625C (en) 2002-01-30
GB2336601A (en) 1999-10-27
CN1134550C (en) 2004-01-14
CN1249786A (en) 2000-04-05
CN1361304A (en) 2002-07-31
WO1999023268A9 (en) 1999-11-04
GB2336601A9 (en) 1999-11-09
CN1134551C (en) 2004-01-14
WO1999023268A1 (en) 1999-05-14
GB2336601B (en) 2002-07-24

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