CN101126140A - A steel plate and a hot dip galvanizing steel plate having superior electric and magnetic shielding property - Google Patents
A steel plate and a hot dip galvanizing steel plate having superior electric and magnetic shielding property Download PDFInfo
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- CN101126140A CN101126140A CNA2007101469149A CN200710146914A CN101126140A CN 101126140 A CN101126140 A CN 101126140A CN A2007101469149 A CNA2007101469149 A CN A2007101469149A CN 200710146914 A CN200710146914 A CN 200710146914A CN 101126140 A CN101126140 A CN 101126140A
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- 229910000831 Steel Inorganic materials 0.000 title claims description 187
- 239000010959 steel Substances 0.000 title claims description 187
- 230000005291 magnetic effect Effects 0.000 title description 80
- 238000005246 galvanizing Methods 0.000 title description 6
- 239000000843 powder Substances 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims description 77
- 239000000203 mixture Substances 0.000 claims description 39
- 238000007598 dipping method Methods 0.000 claims description 38
- 229910052710 silicon Inorganic materials 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 23
- 229910052717 sulfur Inorganic materials 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 20
- 238000009713 electroplating Methods 0.000 claims description 19
- 229910052748 manganese Inorganic materials 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 15
- 238000000576 coating method Methods 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 14
- 230000005855 radiation Effects 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 230000008859 change Effects 0.000 abstract description 7
- 239000000049 pigment Substances 0.000 abstract description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 abstract 5
- 229910001862 magnesium hydroxide Inorganic materials 0.000 abstract 5
- 239000000347 magnesium hydroxide Substances 0.000 abstract 5
- 235000012254 magnesium hydroxide Nutrition 0.000 abstract 5
- 230000005484 gravity Effects 0.000 abstract 1
- 230000000887 hydrating effect Effects 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- 239000013535 sea water Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 27
- 239000010960 cold rolled steel Substances 0.000 description 18
- 238000012216 screening Methods 0.000 description 17
- 230000035699 permeability Effects 0.000 description 16
- 230000002950 deficient Effects 0.000 description 15
- 229910052799 carbon Inorganic materials 0.000 description 14
- 238000007747 plating Methods 0.000 description 14
- 238000000137 annealing Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 229910000976 Electrical steel Inorganic materials 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000005097 cold rolling Methods 0.000 description 8
- 230000005684 electric field Effects 0.000 description 8
- 238000005098 hot rolling Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000002829 reductive effect Effects 0.000 description 7
- 239000011701 zinc Substances 0.000 description 7
- 230000005672 electromagnetic field Effects 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000002421 anti-septic effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000009931 harmful effect Effects 0.000 description 3
- 208000005623 Carcinogenesis Diseases 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- YJPIGAIKUZMOQA-UHFFFAOYSA-N Melatonin Natural products COC1=CC=C2N(C(C)=O)C=C(CCN)C2=C1 YJPIGAIKUZMOQA-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000036952 cancer formation Effects 0.000 description 2
- 231100000504 carcinogenesis Toxicity 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 229940088597 hormone Drugs 0.000 description 2
- 239000005556 hormone Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229960003987 melatonin Drugs 0.000 description 2
- DRLFMBDRBRZALE-UHFFFAOYSA-N melatonin Chemical compound COC1=CC=C2NC=C(CCNC(C)=O)C2=C1 DRLFMBDRBRZALE-UHFFFAOYSA-N 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000001840 Dandruff Diseases 0.000 description 1
- 229910001374 Invar Inorganic materials 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- -1 Na + Chemical class 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 208000013738 Sleep Initiation and Maintenance disease Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 206010022437 insomnia Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/06—Aluminium; Calcium; Magnesium; Compounds thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0097—Anion- and far-infrared-emitting materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Wood Science & Technology (AREA)
- Plant Pathology (AREA)
- Zoology (AREA)
- Pest Control & Pesticides (AREA)
- Agronomy & Crop Science (AREA)
- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Environmental Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Soft Magnetic Materials (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
Provided is a far-infrared emission powder, which has a very high far-infrared emission efficiency, and which comprises magnesium hydroxide and thus has fine granularity, and which shows white color and thus can minimize a change of color even though mixed with other color pigments. The high efficiency far-infrared emission powder has a specific gravity of 1 m not 2/g or more, and comprises 17-99% of Mg(OH)2 component. The powder has a far-infrared emission efficiency of 0.92 or more. The powder is mixed with color pigments other than Mg(OH)2 component. The Mg(OH)2 component is obtained by hydrating MgO having a size of 100 mesh or less. Also, the Mg(OH)2 component is (Mg)OH2 obtained from seawater.
Description
The application is that the name submitted to December 19 calendar year 2001 is called the dividing an application of No. 01805252.5 application for a patent for invention of " steel plate and hot dipping electroplating steel plate with good electric magnetic shield performance ".
Technical field
The present invention relates to a kind of electromagnetic shielding steel plate and a kind of hot dipping electroplating steel plate, it is used for building and electronics aspect, engineering dashboard for example, and electronic equipment casing, the switchboard of transmission line, or the like.Especially, the present invention relates to the electromagnetic field of 60Hz is shown that 26dB or higher shielding effect (shielding efficiency is 95%), yield strength are 18～25kg/mm
2, unit elongation is 40% or higher steel plate and hot dipping electroplating steel plate.
Background technology
Can the generate electromagnetic waves electromagnetic energy of form of many natures and artificial source.These hertzian wave are made up of oscillating electromagnetic fields, this electromagnetism field energy and cell, and plant, animal, or different interactions takes place in human such biosystem.It is found that there is disadvantageous effect in hertzian wave to human body, this discovery has promoted the whole bag of tricks and the Development of Materials of shielding electromagnetic wave.The ripple general name that human body is had a negative impact is harmful to ripple.
In recent years there is harmful effect in the low-frequency electromagnetic wave that studies show that to biosystem.Especially, a series of research has disclosed near the electromagnetic field that produces of transmission line and the mutual relationship of carcinogenesis, and this has produced great effect in the whole world.
Except carcinogenesis, the low-frequency magnetic ripple can make in the human body that is exposed to for a long time under this ripple and produce induced current, thereby has destroyed various ions such as Na
+, K
+, Cl
-The physiological equilibrium of isoionic cross-cell membrane causes the hormone secretion of human body and immunocyte to affect adversely.
In addition, other results of study have shown that magnetic field divides secret influence to melatonin, and melatonin is a hormone of being responsible for the control sleep cycle, and long-term exposure can get insomnia under magnetic field.
Because electromagnetic field has caused the concern of people to environment to the disadvantageous effect of human body, reduces the electromagnetic permissible level that is discharged by all kinds of electric installations and electromagnetic equipment so various countries make laws in succession.And, to the electromagnetic control of electronics and/or electromagnetic equipment import barrier as this kind equipment.For example, Sweden and other European countries' limiting inlet magnetic leakage are higher than televisor or the computer monitor of 2mG.
Similarly, Korea S exposure limit (the Standardsfor human body protection from electromagnetic waves that makes laws and control the frequency band electromagnetic field; Notification No.2000-91 of the Ministry of Information and Communication of Korea).Simultaneously, Korea S's announcement of enacting a law: hertzian wave is decided to be environomental pollution source (Publication No.2001-77 of the Ministry of the Environment of Korea).
In order to solve the influence of above-mentioned unwanted electromagnetic wave to human body, shield technology is developed both ways: structure and material.Aspect building, the U.S. the 6th, 282 discloses magnetic shield room among No. 848 patents and the Japanese kokai publication hei 7-32136.Electro-conductive material resemble copper just is used as the shielding material of anti-electromagnetic wave at present, as the description among the Japanese patent application publication No. 2001-217589.Yet such material only can be used for frequency electromagnetic waves (being higher than 1KHz).
The hertzian wave of 60Hz detects in common power usually, and it is made up of an electric field component and a magnetic-field component, and the two is time to time change all.So, in order to shield these HUMAN HEALTH is had the low-frequency electromagnetic wave of disadvantageous effect, the time electric field and the magnetic field that become should consider together.Yet the utilisation technology of the steel plate in power transformation magnetic field when also not developing effective the shielding.
Steel plate with high magnetic permeability is generally used for electromagnetic shielding.For example, Japanese kokai publication hei 10-208670 number and special open flat 10-96067 number and PCT WO 97/11204 discloses in the colour picture tube that static magnetic field shielding steel plate can be used on TV monitor for example, purpose is the color modulation of prevention television monitor.Under the such static magnetic field in terrestrial magnetic field, can utilize the coercive force and the magnetic permeability of above-mentioned steel plate, but power transformation magnetic field but can not deal with the time.Therefore, the used steel plate of Chang Gui steel plate and electromagnetic wave shielding is different.
According to the needs of different situations, require material of construction can not make the hertzian wave permeable material.About this point, suggestion is applied to the thick silicon steel sheet of hot rolling in the electromagnetic-field-shielded structure, and this technology is disclosed in Japanese Patent and discloses in 2001-107201 number and 2001-107202 number.Yet material of construction has only utilized the high magnetic permeability of silicon steel sheet under the static magnetic field, and the shielding effect of electric field is not described.And the invar plate is not only handled through hot rolling through cold-rolling treatment, so its formability and platability (performance of electrolytic coating) are very poor.
Simultaneously, the inventor discloses a kind of steel that has good shielding effect under low frequency in korean patent application 1999-52018 number.Shielding properties is under static magnetic field, and by the specific conductivity of measuring steel plate and the theoretical value that magnetic permeability obtains, therefore, it is different with actual value.Just run into difficulty so in actual applications, so, still need in time-varying magnetic field, shield evaluation.
In order to satisfy this needs, the method for estimating the shielding properties of steel plate according to frequency is developed (Korean patent No. 2000-799907 and 2000-80886), is among the application now.
Usually the shielding efficiency of steel plate can be obtained by following equation:
Equation 1
Equation 2
Represent that with the dB of unit the shielding effect of steel plate can be obtained by following equation:
Equation 3
Equation 4
According to equation as can be known, the shielding effect with shielding material of 90% shielding efficiency (hertzian wave is subdued to 1/10th) can be expressed as 20dB.Shielding effect with shielding material of 95% shielding efficiency (hertzian wave is subdued to 1/20th) is equivalent to about 26dB.
It seems that with the inventor korean patent application 2000-81056 number this steel plate is based on the electromagnetic shielding cold-rolled steel sheet that has applied the powder that can discharge far-infrared radiation thereon at biological ripple (biowave) steel plate expansion argumentation.In order to improve the shielding effect of anti-time-varying magnetic field, that is to say that in order to obtain the high magnetic permeability in time-varying magnetic field, the bio-wave steel plate of shielding electromagnetic wave contains 0.02% or lower carbon and 0.5～3.5% silicon.
Although the content of C be 0.02% or lower cold-rolled steel sheet have superior electromagnetic shielding effect, find that its intensity is very poor.Not only make its structure become coarse because of particle size, and because the minimizing of carbon sosoloid, and the carbon deposits of steel plate is less, the strain of steel plate reduces.Therefore, this steel plate is unsuitable for being applied in the material of construction and equipment that needs proper strength.
Si content is that 0.5～3.5% silicon steel sheet has good magnetic screening effect, but its electric shielding effect is poor.Especially this eka-silicon armor plate strength is too high, and formability too poor (unit elongation is 40% or lower) is so be difficult to need in the building and household electrical appliance of forming materials to be applied to.The Si steel plate by lamination to be used under the situation in the magnetic core, electrically insulating material is applied on the surface of laminate structure, so that eddy-current loss is minimized.Like this, the such preservative substance of plating Zn is impossible on silicon steel sheet.In addition, the Si steel plate is very expensive because they are not produced by common cold-rolling process (annealing temperature is less than 900 ℃), but in special stove in very high temperature (being higher than 900 ℃) annealing down.Owing to above reason, silicon steel sheet is not suitable for use in building the panel material with household electrical appliance.
If silicon steel sheet is used for outdoor environment, resemble the building external finishing, it must be anticorrosion.At this on the one hand, hot dipping is electroplated preservative substance and is applied to such furring.According to the inventor's experiment, wherein after removing insulating material, silicon steel sheet plates zinc by hot dipping again, find silicon steel sheet owing to there is the cause of zinc, electroplating effect is very poor.
Summary of the invention
Among the present invention, after the electromagnetic shielding steel plate that is fit to building and electrical equipment carried out thorough extensive studies, obtain following result: interstitial element C, N and S and auxiliary element Si, Al, Mn and P have tremendous influence to the intensity of electromagnetic shielding effect and steel plate, and the concentration affects of auxiliary element the galvanized effect of hot rolling of steel plate.
Therefore, an object of the present invention is to overcome the difficulty that runs in the prior art, a kind of steel plate and a kind of hot-dip galvanized steel sheet are provided, this steel plate on the basis of 1mm thickness during to 60Hz the shielding effect in power transformation magnetic field be 26dB (shielding efficiency 95%) or higher, the yield strength of steel plate is 18-25kg/mm
2, unit elongation is 40% or higher.
According to an aspect of the present invention, provide a kind of steel plate with electromagnetic shielding effect.This steel plate is formed by a kind of preparation of compositions, and the content of C is 0.0030% or lower in the said composition; The content of N is 0.0030% or lower; The content of S is 0.0090%; C, the content sum of N and S is 0.0150 weight % or lower; The Mn that contains 0.1-1.0 weight %; Contain 0.5 weight % or lower Si; Contain 1.0 weight % or lower Al; Contain 0.06 weight % or lower P; Remaining is Fe and the element that certainly exists.
According to a further aspect in the invention, provide a kind of hot-dip galvanized steel sheet with high electromagnetic shielding ability and high-yield strength.This steel plate is formed by a kind of preparation of compositions, and the content of C is 0.0030% or lower in the said composition; The content of N is 0.0030% or lower; The content of S is 0.0090%; C, the content sum of N and S is 0.0150 weight % or lower; The Mn that contains 0.2-0.8 weight %; Contain 0.6 weight % or lower Al; Contain 0.4 weight % or lower Si; Contain 0.06 weight % or lower P, condition is Mn, and Al, the total content of Si and P are 0.2～1.0 weight %; Remaining is Fe and the element that certainly exists.
Preferred forms
The invention relates to the steel plate of shield electromagnetic.Magnetic field is produced by electric current, and electric field is caused by voltage.Under the low frequency, hertzian wave is divided into electric component and magnetic component.In order to be used as electromagnetic shielding, material must weaken or shield electric component and magnetic component.
The magnetic screening effect of the anti-low frequency magnetic field of material is by changing magnetic flux path and causing that the ability of eddy-current loss determines.Here, the change of magnetic flux path means, when shielding material runs into harmful magnetic field, and the passage that material surface generates an electromagnetic field and can flow through, magnetic field just can not enter shielding material inside like this, is dissipated and guide to other places.Here, eddy-current loss shows: when the magnetic field of waveshape ran into shielding material, the form with heat energy consumed on the surface of shielding material with magnetic field to offset field direction round-robin eddy current on shielding material.Material with high magnetic permeability has bigger superiority aspect the change magnetic flux path.Simultaneously, the eddy-current loss that low frequency produces down obviously increases with the increase of the specific conductivity of shielding material and magnetic permeability.Therefore, under the 60Hz, the steel plate with high conductivity and high magnetic permeability shows excellent low frequency magnetic field shielding properties.
Even electric current does not flow, also can generate electric field by the existence of potential difference.In order to prevent the shielding space induced electric field, shielding space must be in the equipotential state.Because telling on of the high more inhibition potential difference of specific conductivity is just good more, is the ideal electrical shielding material so have the material of high volume conductance.
According to the inventor's experience, have hertzian wave such the time power transformation magnetic field in the presence of, electric conductivity and the magnetic permeability that accurately measure material are very difficult.In addition, in the process of measuring electric conductivity and magnetic permeability, the preparation of sample is very complicated, and causes big error.
In the present invention, measured the shielding effect of the anti-electromagnetic field of steel plate.In this regard, the low frequency magnetic screening effect be with measure the time the instrument of magnetic screening effect in the power transformation magnetic field (Korean patent No. 2000-79907 and the 2000-80886) that estimate.For the shielding effect of anti-time-varying electric field, be under shielding material existence and non-existent condition, use 1 under the 60Hz that places the shielded cell outside, the voltage source of 200v/m is measured by the ratio of measuring its strength of electric field.
Except Fe, steel plate can comprise other different elements.Usually join in the ferromagnetic Fe maximum permeability and the specific conductivity that influence time-varying magnetic field (60Hz) light plate with the alloying element of the intensity that improves steel plate and antiseptic property.And magnetic permeability and specific conductivity change with the C content of steel plate and the variation of particle size.Certainly, owing to resemble the variation of enhanced mechanism such as solid solution hardening, grain refining, the different steel plates of forming show different mechanical propertys.
According to the present invention, the steel plate of a kind of suitable building and decorative sheet is provided, promptly yield strength is 18～25kg/mm
2, capability of electromagnetic shielding is 95% (26dB) or higher.The inventor done extensively, experimental study completely, in the experiment when the composition of steel plate changes, measured the electromagnetic shielding effect and the physical strength of steel plate, obtained conclusion: each component is determined in the electromagnetic shielding effect of decision steel plate and the effect aspect the intensity.Especially, found C, N, S, Si, Al, Mn and P are very big to the influence of the electromagnetic shielding effect of steel plate and physical strength.According to experimental result, can obtain best steel compositions system.
In addition, experiment is found: Si, the content influence of this class auxiliary element of Al and Mn the galvanizing of steel plate, makes steel plate in the hot dipping platability, and shielding effect and intensity aspect are more superior.
In a word, the electromagnetic shielding effect of steel plate depends on N to a great extent, the content of this class interstitial element of C and S, the perhaps content of those sedimentable elements.For example, the internal stress of steel plate is with C, the increase of the concentration of N and S and increasing, and the intensity of steel plate is also with C, the increase of N and S content and increasing.Simultaneously, interstitial element C, N and S are with Fe
3C, AlN and MnS form precipitate respectively, thereby have improved the intensity of steel plate.
Yet strain increases and sedimentary formation has caused the decline of steel plate magnetic permeability and specific conductivity, so has reduced the shielding properties of steel plate.In fact, only using such interstitial element will obtain having suitable intensity is very difficult with the shielding effect that is higher than 95%.
According to the present invention, C, the total amount of N and S has decisive influence to the capability of electromagnetic shielding of steel plate, so this total amount is limited to the highest by 0.015% in steel compositions.
Preferred C and N each content all less than 0.0030%, the content of S is controlled at 0.0090%, can guarantee that like this steel plate has capability of electromagnetic shielding and mechanical-moulded property.
If interstitial element C, N and S use by above-mentioned definite amount, armor plate strength can variation.For the caused strength reduction of the minimum content that remedies interstitial element, need other yuan usually to make solid solution hardening, to increase the intensity of steel plate.Yet, in order to improve the intensity of steel plate, answer the consumption and the kind of constraint element, in case weaken the electromagnetic shielding effect because of the decline significantly that makes magnetic permeability and electric conductivity.
Steel plate of the present invention contains a certain amount of Si.The content that increases Si can improve the intensity of steel plate, but can reduce magnetic shield performance.Especially, when the content of Si in the steel plate surpassed 0.5 weight %, its unit elongation reduced greatly, simultaneously, it is very weak that the magnetic shielding ability becomes, and is not suitable for use in having the building of enough mechanical-moulded property and the magnetic field shielding plate on the household electrical appliance so Si content surpasses 0.5% steel plate.Therefore, according to the present invention, the content of Si is limited in maximum 0.5 weight %.The higher silicon steel sheet of Si content has higher magnetic permeability usually, thereby has magnetic screening effect preferably.Yet steel plate of the present invention does not have such effect, because the steel plate that uses among the present invention is made according to cold-rolling process, does not pass through the thermal anneal process that the ordinary silicon steel plate carries out.
Steel plate of the present invention also contains a certain amount of Al.Al has improved the intensity of steel plate and has not had obviously to reduce the electromagnetic shielding effect of steel plate.The weight content of the Al of light plate of the present invention is up to 1.0%.If the weight content of Al surpasses 1.0%, that can make the screening ability of the anti-electromagnetic field of steel plate obviously descend, and the unit elongation of steel plate is confined to less than in 40% the scope.
In electromagnetic shielding effect and mechanical properties, Al shows the effect similar with Si.It is believed that similar effect be because two kinds of elements very similar to the influence and the enhanced mechanism of the magnetic permeability of steel plate and electric conductivity.
Also contain Mn in the steel plate of the present invention.Even contain a large amount of Mn in the steel plate, can not change the electric shielding performance, because the Mn element can not influence the specific conductivity of steel plate yet.Yet the mechanical property of steel plate and magnetic shield performance can change significantly with the variation of Mn content.
When the weight content of Mn reaches 0.1%, except that making steel plate have suitable intensity (yield strength 18kg/mm
2) outside, Mn helps magnetic screening effect (being higher than 26dB), the unit elongation (being higher than 40%) of steel plate usually.Yet when the weight content of Mn is increased to when surpassing 1.0%, the magnetic screening effect of steel plate can further not improve, and unit elongation can reduce.Consider above experimental result, the weight content of Mn is 0.1～1.0%.
P less than 0.06% o'clock, although play the effect of the intensity that increases steel plate, can clearly not influence the electromagnetic shielding effect of steel plate at its weight content.When the weight content of P greater than 0.06% the time, armor plate strength is increased to 25kg/mm abnormally
2, and shielding effect descends.Therefore, in the steel plate of the present invention the weight content of P less than 0.06%.
In the manufacturing processed of steel plate, except some inevitable element existed, other resembled Ti, and the such element of V and Nb had better not be contained within the steel plate of the present invention, because they also make the particle size of steel plate diminish except destroying the low frequency electromagnetic shielding properties.So steel plate of the present invention will be got rid of the element that can cause that the steel plate particle size descends as much as possible.
In order to make the steel plate that contains the afore mentioned rules component have antiseptic power, can electroplate it.For example, be coated with the steel plate of zinc layer and steel plate that any material is not plated on the surface and have same electromagnetic shielding effect.Reason is that the zinc layer is very thin, does not almost have magnetic property.
In order to improve the antiseptic power of cold-rolled steel sheet, can be to steel plate hot dipping electro-galvanizing and aluminium.
Because Si, Al and Mn are very big to the hot dipping plating influence of steel plate, electroplate if steel plate itself is subjected to hot dipping, will occur electroplating defective so.Therefore, according to the present invention, provide a kind of hot dipping electroplating steel plate, the content of its element obtains optimum control, so that avoid electroplating the appearance of defective.
In order to ensure the hot dipping electroplating effect of steel plate, the weight content of preferred Si is 0.4% or lower.Because of Si is easy to oxidation, if its too high levels will form the SiO of unfavorable electroplating effect on the surface of cold-rolled steel sheet
2If the weight content of Si is in 0.2～0.4% scope, after the steel plate hot dipping was electroplated, surface of steel plate can turn black, but it is distinguished to some extent with the plating defective.This problem can solve by skin-pass technology subsequently.At this, skin-pass refers to that steel plate is rolling under underload, and for shape and the roughness of controlling steel plate, it is to carry out in the final stage of products production.Therefore, the weight content of preferred Si is 0.2% or lower, and the back is electroplated in hot dipping does not so just need to carry out extra skin-pass technological process.
Hot dipping about steel plate is electroplated, and the weight content of Al is 0.6% or lower in the preferred steel plate.The weight content of Al can reduce the platability of steel plate greater than 0.6%, thereby can cause the plating defective.The weight content of Al can be seen slight plating defective between 0.4～0.6% the time, but the skin-pass process of such plating defective after can electroplating by hot dipping be removed it.Therefore, omit the weight content that extra skin-pass process will limit Al is 0.4% or lower.
For Mn, the weight content of preferred Mn is in 0.2～0.8% scope.For example, if the content of Mn is too little, be difficult to guarantee that the intensity of steel plate reaches suitable level.On the other hand, the weight content of Mn surpasses at 0.8% o'clock, causes the plating defective when hot dipping is electroplated easily.
According to the present invention, Mn, Si, the weight content of Al and P accounts for 0.2～1.0% of steel plate weight.Work as Mn, Si, the weight content sum of Al and P was less than 0.2% o'clock, and the intensity of steel plate only can be increased to the highest 18kg/mm
2Work as Mn, Si, the weight content sum of Al and P surpasses at 1.0% o'clock, and steel plate demonstrates the magnetic screening effect of extreme difference, and, hot dipping can occur and electroplate defective.
Electroplate aspect of performance in hot dipping, other component P, C, the content of N and S limits by above-mentioned.
By controlling the content of auxiliary element as stated above, will produce steel plate effectively with good electromagnetic shielding effect and hot dipping plating performance.
According to the present invention, can apply one deck organic resin on the steel plate, steel plate has just had color like this.After applying the organic resin that contains pigment of one deck as polyethylene or acrylic resin on the steel plate, be called PCM steel plate (pre-coated steel plate), the mechanical property that such PCM steel plate has the characteristic capability of electromagnetic shielding and has before it, this does not only have magnetic because of the dyestuff in the resin, and because coat-thickness is as thin as 25 μ m.
According to the present invention, the far-infrared radiation rate is greater than 0.9 far-infrared radiation powder, and can form a layer thickness on the hot dipping electrolytic coating of electroplating steel plate or steel plate is the radiating layer of 15～60 μ m.This kind far-infrared radiation powder has the 1m of being higher than
2The specific surface area of/g contains 17～99% Mg (OH)
2
Above total description the present invention, further understand can be by with reference to some following specific embodiments, the purpose of these examples is in order the present invention to be described, not to have under the situation of specified otherwise that the present invention is not subjected to the restriction of following example.
Embodiment 1
In order to test interstitial element C, the capability of electromagnetic shielding of N and S prepares the different steel plates of forming, and it has different N, C and S content, and is as shown in table 1 below.Each steel compositions 30kg of fusing under vacuum.In the table 1, " Tr " refers to not add element.
Steel plate reheats under 1250 ℃, and to be hot-rolled down to whole temperature be 900 ℃, obtains the thick hot-rolled steel sheet of 2mm.The hot rolling scurf of steel plate can be removed by acidleach.With the cold rolling one-tenth thickness of the hot-rolled steel sheet of acidleach is 1mm, reduced down in thickness 50%.Adopt the continuous annealing analog machine subsequently,, produce cold-rolled steel sheet 850 ℃ of annealing down.
By electromagnetic shielding effect analysis device, measured the electromagnetic shielding effect of every cold-rolled steel sheet under 60Hz, the results are shown in the following table 1.Simultaneously, the mechanical property of steel plate as yield strength and unit elongation, uses common detecting instrument to measure, and the results are shown in following table 1.
Table 1
| Composition number | Form (weight %) | Magnetic shielding (dB) | Electric shielding (dB) | Yield strength (Kg/mm 2) | Unit elongation (%) | |||||
| C | N | S | Si | Al | Mn | |||||
| C.1 | 0.0025 | 0.0015 | 0.0080 | Tr. | Tr. | Tr. | 28.3 | 41.4 | 14.8 | 51 |
| C 2 | 0.0100 | 0.0030 | 0.0080 | Tr. | Tr. | Tr. | 16.2 | 40.4 | 22.1 | 43 |
| C.3 | 0.0025 | 0.0080 | 0.0080 | Tr. | Tr. | Tr. | 21.3 | 41.0 | 20.8 | 42 |
| 1 | 0.0020 | 0.0020 | 0.0080 | 0.2 | Tr. | 0.2 | 27.9 | 40.1 | 22.3 | 43 |
| 2 | 0.0025 | 0.0025 | 0.0090 | 0.1 | Tr. | 0.1 | 27.7 | 40.1 | 18.7 | 46 |
| C.4 | 0.0020 | 0.0020 | 0.0160 | 0.2 | Tr. | 0.2 | 23.9 | 40.1 | 25.1 | 39 |
| C.5 | 0.0030 | 0.0080 | 0.0100 | 0.2 | Tr. | 0.2 | 22.2 | 39.9 | 25.3 | 38 |
| C.6 | 0.0100 | 0.0025 | 0.0080 | 0.2 | Tr. | 0.2 | 15.4 | 39.8 | 27.2 | 36 |
Data from table 1 obviously as can be seen, each C of steel plate of the present invention (composition No. 1 and No. 2), the weight content sum of N and S is lower than 0.0150%, and contain an amount of Si and Mn respectively, demonstrate excellent electricity and magnetic screening effect, the two is all above 26dB (shielding efficiency 95%), and has the 18kg/mm of being higher than
2Yield strength.Their mechanical-moulded property aspect unit elongation also are good (greater than 40%).
By contrast, in No. 1, the Comparative composition, N, the content of C and S is low, and is very superior aspect the electromagnetic shielding effect, but its intensity is very low, is not suitable for the present invention.
Although the intensity of comparative group difference thing 2-6 steel plate is very high, because of their N, the content of C and S exceeds the upper limit given to this invention, so their magnetic screening effect is very poor, the electric shielding effect reduces greatly.
Embodiment 2
Elements Si and Al are tested the electromagnetic shielding effect of steel plate and the influence of mechanical property.At this moment, the different steel plates of forming of preparation, it has different Al and Si content, and is as shown in table 2 below.Each steel compositions 30kg of fusing under vacuum.In the table 2, " Tr " refers to not add element.
Steel plate reheats under 1250 ℃, and to be hot-rolled down to whole temperature be 900 ℃, obtains the thick hot-rolled steel sheet of 2mm.The hot rolling scale of steel plate can be removed by acidleach.With the cold rolling one-tenth thickness of the hot-rolled steel sheet of acidleach is 1mm, reduced down in thickness 50%.Use the continuous annealing analog machine subsequently,, produce cold-rolled steel sheet 850 ℃ of annealing down.
By electromagnetic shielding effect analysis device, measured the electromagnetic shielding effect of every cold-rolled steel sheet under 60Hz, the results are shown in the following table 2.Simultaneously, the mechanical property of steel plate as yield strength and unit elongation, uses common detecting instrument to measure, and the results are shown in following table 2.
Table 2
| Composition | Form (weight %) | Magnetic shielding (dB) | Electric shielding (dB) | Yield strength (Kg/mm 2) | Unit elongation (%) | |||||
| C | N | Si | Al | Mn | P | |||||
| 3 | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.2 | Tr. | 27.9 | 40.1 | 22.3 | 43 |
| 4 | ＜0.003 | ＜0.003 | 0.4 | Tr. | 0.2 | Tr. | 26.8 | 38.4 | 24.8 | 41 |
| C.7 | ＜0.003 | ＜0.003 | 0.6 | Tr. | 0.2 | Tr. | 25.5 | 37.9 | 27.5 | 39 |
| C.8 | ＜0.003 | ＜0.003 | 0.8 | Tr. | 0.2 | Tr. | 22.7 | 37.9 | 29.2 | 36 |
| 5 | ＜0.003 | ＜0.003 | Tr. | 0.4 | 0.2 | Tr. | 26.6 | 39.8 | 21.4 | 45 |
| 6 | ＜0.003 | ＜0.003 | Tr. | 0.8 | 0.2 | Tr. | 26.1 | 38.6 | 21.2 | 43 |
| C.9 | ＜0.003 | ＜0.003 | Tr. | 1.2 | 0.2 | Tr. | 25.4 | 37.5 | 24.5 | 38 |
| C.10 | ＜0.003 | ＜0.003 | Tr. | 1.6 | 0.2 | Tr. | 24.1 | 36.7 | 26.2 | 36 |
Data from table 2 obviously as can be seen, the C of the steel plate of 3～No. 6 compositions, the weight content sum of N and S within the scope of the present invention, and contain an amount of Si and Al, have excellent electricity and magnetic screening effect, the two is all above 26dB (shielding efficiency 95%), and has the 18kg/mm of being higher than
2Yield strength.Their mechanical-moulded property aspect unit elongation also are good (greater than 40%).
By contrast, Comparative composition 7 and No. 8, their Si content surpasses 0.5%, and unit elongation and magnetic screening effect reduce all greatly.Therefore they are not suitable for use in building the magnetic shielding steel sheet with household electrical appliance.
The Al content of Comparative composition 9 and No. 10 surpasses 1.0%, although its intensity has improved, their electricity and magnetic screening effect are all low, and unit elongation also is lower than 40%.Therefore they are not suitable for the present invention.
Embodiment 3
The different steel plates of forming of preparation, it has different Mn and P content, and is as shown in table 3 below.Each steel compositions 30kg of fusing under vacuum.In the table 3, " Tr " refers to not add element.
Steel plate reheats under 1250 ℃, and to be hot-rolled down to whole temperature be 900 ℃, obtains the thick hot-rolled steel sheet of 2mm.The hot rolling scale of steel plate can be removed by acidleach.With the cold rolling one-tenth thickness of the hot-rolled steel sheet of acidleach is 1mm, reduced down in thickness 50%.Use the continuous annealing analog machine subsequently,, produce cold-rolled steel sheet 850 ℃ of annealing down.
By electromagnetic shielding effect analysis device, measured the electromagnetic shielding effect of every cold-rolled steel sheet under 60Hz, the results are shown in the following table 3.Simultaneously, the mechanical property of steel plate as yield strength and unit elongation, uses common detecting instrument to measure, and the results are shown in following table 3.
Table 3
| Composition number | Form (weight %) | Magnetic shielding (dB) | Electric shielding (dB) | Yield strength (Kg/mm 2) | Unit elongation (%) | |||||
| C | N | Si | Al | Mn | P | |||||
| 7 | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.1 | Tr. | 27.3 | 40.1 | 23.5 | 41 |
| 8 | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.3 | Tr. | 27.7 | 40.0 | 21.8 | 45 |
| 9 | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.5 | Tr. | 27.9 | 40.0 | 19.5 | 48 |
| 10 | ＜0.003 | ＜0.003 | 02 | Tr. | 0.7 | Tr. | 26.0 | 39.9 | 21.3 | 43 |
| C.11 | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.9 | Tr. | 24.7 | 39.9 | 23.5 | 40 |
| 11 | ＜0.003 | ＜0.003 | Tr. | Tr. | 0.7 | Tr. | 26.6 | 40.3 | 21.4 | 45 |
| 12 | ＜0.003 | ＜0.003 | Tr. | Tr. | 0.9 | Tr. | 26.1 | 40.1 | 23.1 | 41 |
| C.12 | ＜0.003 | ＜0.003 | Tr. | Tr. | 1.1 | Tr. | 25.4 | 40.1 | 25.2 | 38 |
| 13 | ＜0.003 | ＜0.003 | 0.3 | 0.3 | 0.2 | Tr. | 26.2 | 38.5 | 24.1 | 42 |
| 14 | ＜0.003 | ＜0.003 | 0.3 | 0.3 | 0.2 | 0.04 | 26.0 | 38.2 | 24.7 | 41 |
| C.13 | ＜0.003 | ＜0.003 | 0.3 | 0.3 | 0.2 | 0.08 | 23.8 | 38.2 | 27.3 | 36 |
Data from table 3 obviously as can be seen, the C of the steel plate of 7～No. 14 compositions, the weight content sum of N and S within the scope of the present invention, and contain an amount of Mn, Si and Al, have excellent electricity and magnetic screening effect, the two is all above 26dB (shielding efficiency 95%), and has the 18kg/mm of being higher than
2Yield strength.Their mechanical-moulded property aspect unit elongation also are good (greater than 40%).
By contrast, the Mn content of Comparative composition 11 and No. 12 surpasses 0.8%, and the electromagnetic shielding effect is very poor, and unit elongation also reduces.The P content of Comparative composition 13 surpasses 0.06%, because its unit elongation and shielding effect are all bad, so it is not suitable for the present invention.
Embodiment 4
Pressing on composition number 1～3 cold-rolled steel sheet of making, using down at 65 ℃ and electroplate simulator with coating density 15g/m2 electro-galvanizing.Before showing steel plate and electroplate, analytical results has identical electromagnetic shielding effect and mechanical property.This is based on the following fact: except that zinc coating was as thin as 2.5 μ m, Zn coating did not have magnetic yet.Therefore, cold-rolled steel sheet of the present invention has good electromagnetic shielding effect, and can be made into anticorrosion steel plate.
Embodiment 5
The different steel plates of forming of preparation, it has different Si and Al content, and is as shown in table 4 below.Each steel compositions 30kg of fusing under vacuum.In the table 4, " Tr " refers to not add element.
Steel plate reheats under 1250 ℃, and to be hot-rolled down to whole temperature be 900 ℃, obtains the thick hot-rolled steel sheet of 2mm.The hot rolling scale of steel plate can be removed by acidleach.With the cold rolling one-tenth thickness of the hot-rolled steel sheet of acidleach is 1mm, reduced down in thickness 50%.Use the continuous annealing analog machine subsequently,, produce cold-rolled steel sheet 850 ℃ of annealing down.Use hot dipping to electroplate simulator hot dipping electro-galvanizing to coating density on this cold-rolled steel sheet then and be 300g/m
2
By electromagnetic shielding effect analysis device, measured the electromagnetic shielding effect of every galvanized cold-rolled steel sheet under 60Hz, the results are shown in the following table 4.Simultaneously, the mechanical property of steel plate as yield strength and unit elongation, uses common detecting instrument to measure, and the results are shown in following table 4.
The adhesivity of coating is determined and measured in observation with the naked eye, and the platability of hot dipping electroplating steel plate can be expressed as following form: zero represents platability good; There is recoverable defective in the △ representative, and this defective can be removed by the skin-pass process; There is the serious plating defective that can not repair in * representative.All kinds of situations are listed in the table 4.
Table 4
| Composition number | Form (weight %) | Magnetic shielding (dB) | Electric shielding (dB) | Yield strength (Kg/mm 2) | The hot dipping platability | |||||
| C | N | Si | Al | Mn | P | |||||
| 1′ | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.2 | Tr. | 28.1 | 40.5 | 22.0 | ○ |
| 2′ | ＜0.003 | ＜0.003 | 0.4 | Tr. | 0.2 | Tr. | 26.9 | 38.9 | 24.0 | △ |
| C.1′ | ＜0.003 | ＜0.003 | 0.6 | Tr. | 0.2 | Tr. | 25.5 | 38.2 | 27.4 | × |
| C.2′ | ＜0.003 | ＜0.003 | 0.8 | Tr. | 0.2 | Tr. | 22.8 | 38.0 | 28.6 | × |
| 3′ | ＜0.003 | ＜0.003 | Tr. | 0.2 | 0.2 | Tr. | 26.9 | 40.5 | 20.6 | ○ |
| 4′ | ＜0.003 | ＜0.003 | Tr. | 0.4 | 0.2 | Tr. | 26.5 | 39.9 | 21.3 | ○ |
| 5′ | ＜0.003 | ＜0.003 | Tr. | 0.6 | 0.2 | Tr. | 26.1 | 39.2 | 23.3 | △ |
| C.3′ | ＜0.003 | ＜0.003 | Tr. | 0.8 | 0.2 | Tr. | 25.4 | 38.8 | 22.5 | × |
| 6′ | ＜0.003 | ＜0.003 | 0.3 | 0.3 | 0.2 | Tr. | 26.1 | 38.5 | 24.1 | ○ |
| C.4′ | ＜0.003 | ＜0.003 | 0.3 | 0.4 | 0.2 | Tr. | 24.2 | 38.2 | 25.8 | ○ |
| C.5′ | ＜0.003 | ＜0.003 | 0.3 | 0.6 | 0.2 | Tr. | 21.6 | 37.7 | 26.3 | × |
Data from table 4 obviously as can be seen, the C of steel plate of the present invention (composition 1 '～6 ' number), the weight content sum of N and S is lower than 0.0150%, and contain an amount of Mn, Al, Si and P, these steel plates all have excellent electricity and magnetic screening effect except that having usually preferably platability.Especially, when the content of Al and Si is controlled at 0.4% and 0.2% respectively when following, composition 1 ', 3 ', 4 ' and 6 ' number than the better platability in other composition 2 ' and 5 ' number have.
On the other hand, Comparative composition 1 ' and 2 ' number Si content surpass 0.4%, show relatively poor platability, so that can observe the plating defective.It is believed that this is because Si is easy to oxidizedly, forms SiO at surface of steel plate
2
Al content surpass 0.6% Comparative composition 3 ' number in, can observe serious plating defective.
Even Mn, Si and Al content separately is in scope given to this invention, but Mn, Al, the total amount of Si and P surpasses 1.0% when (Comparative composition 4 ' and 5 ' number), and the steel plate after hot dipping is electroplated shows very poor platability aspect plating adhesion, also descend to some extent aspect magnetic screening effect.
Embodiment 6
The different steel plates of forming of preparation, it has different Mn content, and is as shown in table 5 below.Heavily under vacuum, melt for each steel compositions of 30kg.In the table 5, " Tr " refers to not add element.
Steel plate reheats under 1250 ℃, and to be hot-rolled down to whole temperature be 900 ℃, obtains the thick hot-rolled steel sheet of 2mm.The hot rolling scale of steel plate can be removed by acidleach.Subsequently, be 1mm with the cold rolling one-tenth thickness of the hot-rolled steel of acidleach, reduced down in thickness 50%.Subsequently, use the continuous annealing analog machine,, produce cold-rolled steel sheet 850 ℃ of annealing down.Use hot dipping to electroplate simulator hot dipping electro-galvanizing to coating density on this cold-rolled steel sheet then and be 300g/m
2
By electromagnetic shielding effect analysis device, measured the electromagnetic shielding effect of every galvanized cold-rolled steel sheet under 60Hz, the results are shown in the following table 5.Simultaneously, the mechanical property of steel plate as yield strength and unit elongation, uses common detecting instrument to measure, and the results are shown in following table 5.
Observation with the naked eye determines and measure after the adhesivity of coating that the platability of hot dipping electroplating steel plate can be expressed as following form: zero represents platability good; There is the serious plating defective that can not repair in * representative.All kinds of situations are listed in the table 5.
Table 5
| Composition number | Form (weight %) | Magnetic shielding (dB) | Electric shielding (dB) | Yield strength (Kg/mm 2) | The hot dipping platability | ||||
| C | N | Si | Al | Mn | |||||
| 7′ | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.2 | 27.9 | 40.5 | 23.5 | ○ |
| 8′ | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.4 | 28.2 | 40.3 | 21.8 | ○ |
| 9′ | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.6 | 28.3 | 40.4 | 19.5 | ○ |
| 10′ | ＜0.003 | ＜0.003 | 0.2 | Tr. | 0.8 | 26.8 | 40.3 | 21.3 | ○ |
| C.6′ | ＜0.003 | ＜0.003 | 0.2 | Tr. | 1.0 | 25.6 | 40.2 | 23.5 | × |
| 11′ | ＜0.003 | ＜0.003 | Tr. | Tr. | 0.2 | 28.1 | 40.5 | 18.1 | ○ |
| C.7′ | ＜0.003 | ＜0.003 | Tr. | Tr. | Tr. | 28.4 | 41.5 | 14.5 | ○ |
Data from table 5 obviously as can be seen, the weight content of Mn is in scope given to this invention and Mn, and Al, the total content of Si and P are lower than 1.0% steel plate (composition 7 '～11 ' number), all demonstrate excellent yield strength, capability of electromagnetic shielding and good platability.
By contrast, Comparative composition 6 ' number Mn content surpass 0.8%, and Mn, Si, the total amount of Al and P surpasses 1.0%, can observe to have serious plating defective.On the other hand, although Comparative composition 7 ' number electroplate property in capability of electromagnetic shielding and hot dipping is very superior, its yield strength is low, is not suitable for use in common building panel.
Industrial applicibility
As mentioned above, the capability of electromagnetic shielding of steel plate of the present invention, yield strength and processing characteristics are very superior, its interstitial element C, N and S and auxiliary element Si, Al, the content of Mn and P are all in control range, so this steel plate is suitable as the electromagnetic-field-shielded plate of building and electric equipment.
Claims (12)
1. steel plate with electromagnetic shielding effect, its yield strength is 18.1～24.8kg/mm
2, unit elongation is 41～48%, and described steel plate is formed by a kind of preparation of compositions, and in weight content, the content of C is for being lower than 0.0030% in the said composition; The content of N is for being lower than 0.0030%; The content of S is 0.0090%; C, the content sum of N and S is 0.0140% or lower; The content of Mn is 0.1～0.9%; The content of Si is 0.4% or lower; The content of Al is 0.4% or lower; The content of P is 0.04% or lower; Remaining is Fe and the element that certainly exists.
2. the described steel plate of claim 1, wherein when steel plate thickness was 1mm, the electromagnetic shielding effect was measured as 26dB or higher under 60Hz.
3. the described steel plate of claim 1 comprises one deck electrolytic coating on it.
4. the described steel plate of claim 3, also comprising a layer thickness on its electrolytic coating is the organic resin coating of 25 μ m.
5. the described steel plate of claim 3, wherein said electrolytic coating are that 0.9 far-infrared radiation powder covers by one deck far-infrared radiation efficient, and the thickness of powder bed is 15～60 μ m.
6. the described steel plate of claim 5, wherein said far-infrared radiation powder has 1m
2The specific surface area of/g, and contain the Mg (OH) of 17～99 weight %
2
7. the hot dipping electroplating steel plate with high electromagnetic shielding effect and high-yield strength is coated with anticorrosion element on it, and this steel plate is formed by a kind of preparation of compositions, and in weight content, the content of C is for being lower than 0.0030% in the said composition; The content of N is for being lower than 0.0030%; The content of S is 0.0090%; C, the content sum of N and S is 0.0140% or lower; The content of Mn is 0.2～0.8%; The content of Al is 0.6% or lower; The content of Si is 0.4% or lower; The content of P is 0.04% or lower, and condition is Mn, Al, and the content sum of Si and P is 0.3～1.0%; Remaining is Fe and the element that certainly exists.
8. the described hot dipping steel plate of claim 7, wherein Al and Si weight content separately is respectively 0.4% or lower, and 0.2% or lower.
9. the described hot dipping electroplating steel plate of claim 7, wherein when steel plate thickness was 1mm, its electromagnetic shielding effect was measured as 26dB or higher under 60Hz, and its yield strength is 18.1～24.8kg/mm
2Or it is higher.
10. the described hot dipping electroplating steel plate of claim 7, further comprising a layer thickness on its hot dipping electrolytic coating is the organic resin coating of 25 μ m.
11. the described hot dipping electroplating steel plate of claim 7, it comprises that further one deck far-infrared radiation rate is 0.9 or higher far-infrared radiation powder bed, and thickness is 15～60 μ m.
12. the described hot dipping electroplating steel plate of claim 7, wherein the far-infrared radiation powder has 1m
2The specific surface area of/g, and contain the Mg (OH) of 17～99 weight %
2
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2000/78772 | 2000-12-19 | ||
| KR10-2000-0078772A KR100490989B1 (en) | 2000-12-19 | 2000-12-19 | Powder containing magnesium hydroxides of radiating far infrared ray |
| KR2000/81056 | 2000-12-23 |
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| CNA018052525A Division CN1554217A (en) | 2000-12-19 | 2001-12-19 | A steel plate and a hot dip galvanizing steel plate having superior electric and magnetic shielding property |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111492725A (en) * | 2017-12-22 | 2020-08-04 | 株式会社Posco | Steel sheet for shielding magnetic field and method for manufacturing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR900006255A (en) * | 1988-10-24 | 1990-05-07 | 이영자 | Method for manufacturing far-infrared radiation ceramic (CERAMIC) |
| KR910009955B1 (en) * | 1989-03-31 | 1991-12-07 | 한국 바이오-텍 주식회사 | Preparation method of ceramic particles having high ultraviolet emissivity |
| KR930000003B1 (en) * | 1989-07-15 | 1993-01-06 | 강기세 | Far-ir radiating ceramic composition and processing method therefore |
| JPH03112849A (en) * | 1989-09-25 | 1991-05-14 | Nariyuki Furuta | Far infrared radiating powder, production of sintered powder and its use |
| KR940021473A (en) * | 1993-03-30 | 1994-10-19 | 박상민 | Manufacturing method of roasting plate using pyramidal tetrahedral protrusion with far infrared radiation black body |
| JPH10297961A (en) * | 1997-04-28 | 1998-11-10 | Life Field Sogo Kenkyusho:Kk | Far-infrared ray-radiating body and its production |
| KR20000038422A (en) * | 1998-12-07 | 2000-07-05 | 김영건 | Multi-functional far-infrared radiating material composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111492725A (en) * | 2017-12-22 | 2020-08-04 | 株式会社Posco | Steel sheet for shielding magnetic field and method for manufacturing the same |
| CN111492725B (en) * | 2017-12-22 | 2023-09-19 | 浦项股份有限公司 | Steel sheet for shielding magnetic field and method for manufacturing same |
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| Publication number | Publication date |
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| KR100490989B1 (en) | 2005-05-24 |
| KR20020049583A (en) | 2002-06-26 |
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