KR100584730B1 - A cold rolled steel sheet for building materials protecting from electromagnetic wave and a method for manufacturing it - Google Patents
A cold rolled steel sheet for building materials protecting from electromagnetic wave and a method for manufacturing it Download PDFInfo
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- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 20
- 239000004566 building material Substances 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000005291 magnetic effect Effects 0.000 claims abstract description 45
- 230000035699 permeability Effects 0.000 claims abstract description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 230000009467 reduction Effects 0.000 claims abstract description 11
- 239000004035 construction material Substances 0.000 claims abstract description 10
- 238000005097 cold rolling Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 238000007747 plating Methods 0.000 claims description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims 1
- 239000011701 zinc Substances 0.000 claims 1
- 229910052725 zinc Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 28
- 230000000052 comparative effect Effects 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 208000005623 Carcinogenesis Diseases 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
- 238000002474 experimental method Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000028327 secretion Effects 0.000 description 2
- 230000003068 static effect Effects 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 1
- -1 Na + Chemical class 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
- 238000000137 annealing Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000011841 epidemiological investigation Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229940088597 hormone Drugs 0.000 description 1
- 239000005556 hormone Substances 0.000 description 1
- 210000002865 immune cell Anatomy 0.000 description 1
- 206010022437 insomnia Diseases 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229960003987 melatonin Drugs 0.000 description 1
- DRLFMBDRBRZALE-UHFFFAOYSA-N melatonin Chemical compound COC1=CC=C2NC=C(CCNC(C)=O)C2=C1 DRLFMBDRBRZALE-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
Classifications
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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
- C21D8/1216—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
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
-
- 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
- C21D8/1277—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
- 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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Electromagnetism (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Dispersion Chemistry (AREA)
- Power Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
본 발명은 지붕재, 내외벽재, 데크 플레이트 등의 건축자재에 사용되는 전자파 차폐 냉연강판 및 그 제조방법에 관한 것으로, 항복강도(YS)≥25Kg/㎟를 확보하면서 60Hz에서 시변자계에 의한 최대 투자율이 2000이상인 건자재용 전자파 차폐 냉연강판 및 그것의 제조방법을 제공하고자 하는데, 그 목적이 있다.The present invention relates to an electromagnetic shielding cold rolled steel sheet used in building materials, such as roofing materials, interior and exterior wall materials, deck plates, and a method for manufacturing the same, wherein the maximum permeability by a time-varying magnetic field is obtained at 60 Hz while securing yield strength (YS) ≥ 25 Kg / mm 2. An object of the present invention is to provide an electromagnetic shielding cold rolled steel sheet and a method for manufacturing the same, which are more than 2000.
상기한 목적을 달성하기 위한 본 발명은, The present invention for achieving the above object,
탄소(C): 0.03~0.06중량%를 함유하며, 60Hz에서 시변 자계에 의한 최대 투자율이 2000이상이고, 항복강도가 25Kg/㎟ 이상인 건자재용 전자파 차폐 냉연강판 및 냉강압연시 압하율을 45% 이하로 하는 것을 특징으로 하는 건자재용 전자파 차폐 냉연강판의 제조방법을 기술적 요지로 한다.Carbon (C): Containing 0.03 ~ 0.06% by weight, maximum permeability by time-varying magnetic field at 60Hz, yield strength 25Kg / mm2 or more electromagnetic shielding cold rolled steel sheet for building materials and cold rolling rolling reduction rate of 45% or less Technical aspect of the present invention provides a method of manufacturing an electromagnetic shielding cold rolled steel sheet for construction materials.
냉연강판, 전자파, 건자재, 최대투자율, 항복강도Cold rolled steel, electromagnetic waves, construction materials, maximum permeability, yield strength
Description
본 발명은 지붕재, 내외벽재, 데크 플레이트 등의 건축자재에 사용되는 전자파 차폐 냉연강판 및 그 제조방법에 관한 것으로, 보다 상세하게는 저주파 전자파에 대한 자기 차폐성이 우수하고, 동시에 건자재용으로 적합한 강도를 갖는 냉연강판 및 그 제조방법에 관한 것이다.The present invention relates to an electromagnetic shielding cold rolled steel sheet used in building materials such as roofing materials, interior and exterior wall materials, deck plates, and a method for manufacturing the same. More particularly, the present invention provides excellent magnetic shielding against low-frequency electromagnetic waves, and at the same time, suitable strength for building materials. It has a cold rolled steel sheet having a and a method for producing the same.
최근 들어 전자파의 유해성이 알려지기 시작하면서 이를 차단하기 위한 방법과 재료들이 등장하고 있다. 전자파란 전자기장 성분을 가지는 파동(wave)을 말하며, 인체에 악영향을 미치는 파를 유해파라고 한다. 특히, 최근 들어서는 자기적 성질을 갖는 낮은 주파수의 저주파의 인체에 대한 유해성이 부각되고 있고, 송전탑 주위의 자기장(60Hz)이 발암과의 상관성이 알려지면서 국내외적으로 큰 반향을 불러일으키고 있다. 이와 같은 발암 등의 위해성 논의 외에도, 자기적 성질을 갖는 저주파 전자파에 인체가 장기간 노출되면 인체 내에 유도전류가 생성되어 세포막내 에 존재하는 Na+, K+, Cl- 등의 각종 이온의 불균형을 초래하여, 호르몬 분비 및 면역 세포에 영향을 주는 것으로 알려져 있다. 또한, 자기장은 인체의 수면과 관련 있는 멜라토닌의 분비량을 변화시켜 장기 노출시 불면증과 등과 관계된다는 연구 결과가 보고되고 있다.Recently, as the harmfulness of electromagnetic waves is known, methods and materials for blocking them are emerging. Electromagnetic waves are waves that have electromagnetic field components. Waves that have an adverse effect on the human body are called harmful waves. In particular, in recent years, the harmonics of low frequency low-frequency human body with magnetic properties has been highlighted, and the magnetic field (60Hz) around the transmission tower has been known to correlate with carcinogenesis, causing a great response at home and abroad. In addition to such risk discussions such as carcinogenesis, long-term exposure of the human body to low-frequency electromagnetic waves with magnetic properties generates an induced current in the human body, resulting in an imbalance of various ions such as Na +, K + and Cl- in the cell membrane. It is known to affect hormone secretion and immune cells. In addition, research has been reported that the magnetic field is associated with insomnia upon long-term exposure by changing the secretion amount of melatonin associated with human sleep.
이에 따라, 세계 각국은 전자파 노출한계를 설정하고 전자기기에서 나오는 전자파의 규제를 전자기기의 수출 장벽으로도 활용하고 있는데, 예를 들어, 모니터의 경우 자기누설이 2mG 이상이면 스웨덴 등 유럽 지역으로의 수출은 불가능하게 된다. As a result, countries around the world have set limits for exposure to electromagnetic waves and are also using the regulation of electromagnetic waves from electronic devices as export barriers for electronic devices.For example, if the magnetic leakage is more than 2 mG for monitors, Export becomes impossible.
한편, 국내에서도 전자기 관련 학회(한국 전자파 학회지 전자파 기술 1997.6 vol.8 No2 )와 의료계를 중심으로 전자파 규제치를 법령으로 설정하려고 하는 노력이 경주되고 있다(전자파 인체 유해 문제 대책 위원회 국회 활동 백서 1999년 12월, 전자파의 인체영향에 관한 역학조사 및 법제화 방안 연구 : 한국무선국 관리사업단 KORA 연구 99-09, 2000년 8월).On the other hand, efforts are being made in Korea to establish electromagnetic wave regulation values by law, especially in the electromagnetic related society (Korea Electromagnetic Engineering Electromagnetic Technology 1997.6 vol.8 No2) and the medical field. February, A Study on Epidemiological Investigation and Legislation on the Influence of Electromagnetic Waves on the Human Body: KORA Study 99-09, August 2000).
이와 같은 전자파를 차폐하기 위해서는, 설비적 차폐기술은 물론 재료적 차폐기술이 병행되어야 하는데, 현재는 전자파 차단재로서 주로 동, 알루미늄을 이용하고 있다. 한편, 본 발명자들은 대한민국 특허출원 제1999-0052018호에서 저주파에서 자기장 차폐능이 뛰어난 강재에 관한 기술을 기 출원 한 바 있으며, 대한민국 특허출원 제2000-81056호에서는 차폐와 원적외선을 방사시키는 바이오 웨이브 강판에 관한 기술을 기 출원한 바 있다. In order to shield such electromagnetic waves, not only the facility shielding technology but also the material shielding technology should be used in parallel. Currently, copper and aluminum are mainly used as electromagnetic shielding materials. Meanwhile, the inventors of the present invention have previously applied for a technology related to steel materials having excellent magnetic shielding ability at low frequencies in Korean Patent Application No. 1999-0052018, and Korean Patent Application No. 2000-81056 to a biowave steel sheet which radiates shielding and far infrared rays. Related art has been filed previously.
상기한 대한민국 특허출원 제1999-0052018호는 정자계 DC하에서 측정한 것으로 실제 차폐능과 차이가 있기에 시변자계 AC하에서의 차폐평가가 필요하며, 또한 냉간압하율에 대한 검토가 없기 때문에, 실제적으로 건자재용도의 강도와 전자파 차폐성을 동시에 요구하는 파트에는 적용이 곤란하다.The above-mentioned Korean Patent Application No. 1999-0052018 is measured under static magnetic field DC. Since it is different from the actual shielding ability, it is necessary to evaluate the shielding under time-varying magnetic AC, and since there is no review of cold reduction rate, it is practically used for building materials. It is difficult to apply to parts that require both strength and electromagnetic shielding at the same time.
또한, 상기한 대한민국 특허출원 제2000-81056호에서는, 시변자계 자기장에 대한 차폐능 향상, 즉 시변자계하에서 높은 투자율을 얻기 위해, 탄소 0.02중량% 이하, 잔부 Fe가 적어도 95중량% 이상을 함유한 강판을 제시하고 있다. 즉, 시변자계(60Hz)하에서의 최대투자율은 급격히 저하되기 때문에, 상기 기술에서는 탄소 함량을 0.02% 이하로 제한하는 것이다. 그러나, 탄소함량이 0.02% 이하이면 강도가 부족하여 건자재 용도로 사용이 부적합하다. 즉, 탄소함량이 낮으면 강재조직의 입자크기가 조대해져서 자기 차폐성은 우수해지지만, 강도는 하락하기 때문에 우수한 강도가 요구되는 건자재용, 즉 지붕재, 내외벽재, 데크 플레이트 등으로는 적용이 곤란한 것이다.In addition, in the above-mentioned Korean Patent Application No. 2000-81056, in order to improve the shielding ability against the time-varying magnetic field, that is, to obtain a high permeability under the time-varying magnetic field, the carbon content contains 0.02% by weight or less and the balance Fe contains at least 95% by weight or more. The steel sheet is presented. That is, since the maximum permeability under time-varying magnetic field (60 Hz) is sharply lowered, the above technique limits the carbon content to 0.02% or less. However, when the carbon content is 0.02% or less, the strength is insufficient, so it is not suitable for use in building materials. In other words, if the carbon content is low, the particle size of the steel structure is coarse to improve the magnetic shielding property, but the strength is lowered, so it is difficult to be applied to the construction materials that require excellent strength, that is, roofing materials, interior and exterior wall materials, and deck plates. .
이에, 본 발명의 발명자들은 상기한 문제점을 해결하기 위해 연구와 실험을 거듭하고 그 결과에 근거하여 본 발명을 제안하게 된 것으로, 본 발명은 항복강도(YS)≥25Kg/㎟를 확보하면서 60Hz에서 시변자계에 의한 최대 투자율이 2000이상인 건자재용 전자파 차폐 냉연강판 및 그것의 제조방법을 제공하고자 하는데, 그 목적이 있다.Accordingly, the inventors of the present invention repeated the research and experiment to solve the above problems and proposed the present invention based on the results, the present invention at 60Hz while ensuring the yield strength (YS) ≥ 25Kg / ㎜ An object of the present invention is to provide an electromagnetic shielding cold rolled steel sheet for construction materials having a maximum permeability of 2000 or more, and a method of manufacturing the same.
상기한 목적을 달성하기 위한 본 발명은, The present invention for achieving the above object,
탄소(C): 0.03~0.06중량%를 함유하며, 60Hz에서 시변 자계(time varying magnetic wave)에 의한 최대 투자율이 2000이상이고, 항복강도가 25Kg/㎟ 이상인 건자재용 전자파 차폐 냉연강판에 관한 것이다.Carbon (C): 0.03 to 0.06% by weight, and the maximum permeability by time varying magnetic wave at 60Hz, the maximum permeability of the present invention relates to electromagnetic shielding cold-rolled steel sheet for construction materials having a yield strength of 25Kg / mm2 or more.
또한, 본 발명은, In addition, the present invention,
탄소(C): 0.03~0.06중량%를 함유하는 열연강판을 45% 이하의 압하율로 냉간압연하는 것을 특징으로 하는 건자재용 전자파 차폐 냉연강판의 제조방법에 관한 것이다.Carbon (C): The present invention relates to a method for producing an electromagnetic shielding cold rolled steel sheet for building materials, characterized in that the cold rolled hot-rolled steel sheet containing 0.03 to 0.06% by weight at a rolling reduction of 45% or less.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명의 강판에 있어서 요구되는 특성인 저주파 자기장 차폐능은, 자속의 경로(이하, 자로라고 함)변경과 와전류 손실(eddy current loss)에 의해 결정된다. 자로 변경이란 어떤 유해 자기장이 차폐재에 입사될 때 차폐재가 자기장의 흐르는 길을 만들어 주어 자기장이 특정 구역안으로 들어오지 못하고 차폐재 표면을 통해 다른 쪽으로 흐르도록 만드는 것을 말한다. 여기서, 특정구역이란 차폐재로 보호하기 위한 공간을 말한다. 이와 같은 자로 변경에는 높은 투자율일수록 유리하다. 또한, 와전류 손실이란, 자기장이 파동 형태로 들어오면 이 자기장을 없애려는 방향으로 와전류(맴돌이전류, eddy current)가 생성되어 강판표면에서 열에너지로서 손 실되는 것을 말한다. 이와 같이, 저주파에서 발생하는 와전류 손실은, 통상적으로 재료의 전기전도도와 투자율이 클수록 높아지는데, 강판은 금속이므로 기본적으로 매우 높은 전기전도도를 가지고 있고 실제 가공상태에 따라 전기전도도가 약간 달라지기는 하지만, 차폐능을 좌우할 만큼 크지 못하여, 상기 와전류 손실은 대부분 투자율에 의존한다.The low frequency magnetic field shielding capability, which is a characteristic required for the steel sheet of the present invention, is determined by the change of the path of the magnetic flux (hereinafter referred to as gyro) and the eddy current loss. The change of magnetic path means that when a harmful magnetic field enters the shield, the shield creates a flow path for the magnetic field so that the magnetic field does not enter a particular zone but flows through the surface of the shield to the other side. Here, the specific area means a space for protecting with shielding material. The higher the magnetic permeability is, the better. In addition, eddy current loss means that when a magnetic field enters a wave form, an eddy current (eddy current) is generated in a direction to remove the magnetic field and is lost as thermal energy on the surface of the steel sheet. As such, the eddy current loss occurring at low frequency is generally higher as the electrical conductivity and permeability of the material increases. Since the steel sheet is a metal, it has a very high electrical conductivity, and the electrical conductivity varies slightly depending on the actual processing state. In other words, the eddy current loss is largely dependent on the permeability since it is not large enough to influence the shielding ability.
따라서, 본 발명의 발명자들은 차폐능이 우수한 강판을 제조하기 위해, 상기한 차폐능 결정 인자들을 고려하여 연구 및 실험을 거듭한 결과, 강판의 자기장 차폐 능력은 정자계 상태에서 측정한 투자율값보다는 60Hz 상태에서의 최대 투자율(max permeability)과 매우 밀접한 관계를 가짐을 확인하고, 60Hz에서 시변자계에 의한 최대 투자율이 2000 이상 확보되도록 하였다. 여기서, 시변자계에 의한 투자율이란, 주파수를 가진 자기장을 걸어 측정하는 투자율을 의미하며, 시변자계 자기장에 대한 차폐능과 매우 높은 상관관계를 갖는다.Therefore, the inventors of the present invention have conducted research and experiments in consideration of the above-described shielding ability determinants in order to manufacture a steel sheet having excellent shielding ability. As a result, the magnetic field shielding ability of the steel sheet is 60 Hz rather than the magnetic permeability measured in the static magnetic field. The maximum permeability in Eq. (2) is very close to the maximum permeability. Here, the magnetic permeability by the time-varying magnetic field means the magnetic permeability measured by applying a magnetic field having a frequency, and has a very high correlation with the shielding ability against the time-varying magnetic field.
한편, 철(Fe)은 강자성체로서 비교적 높은 시변자계(60Hz)하의 최대투자율을 가지고 있으나, 강도, 내식성 등의 향상을 목적으로 다양한 합금원소가 첨가되거나 탄소함량, 결정입도 등이 변화되기 때문에, 시변자계(60Hz)하의 최대투자율은 크게 달라지게 된다. On the other hand, iron (Fe) has a maximum permeability under a relatively high time-varying magnetic field (60 Hz) as a ferromagnetic material, but it is time-varying because various alloying elements are added or carbon content and grain size change for the purpose of improving strength and corrosion resistance. The maximum permeability under magnetic field (60 Hz) will vary greatly.
본 발명에서는 건자재 용도에 적합한 강도, 즉 항복강도(YS) 25Kg/㎟ 이상을 확보하기 위하여 탄소함량을 0.03~0.06중량%로 높게 설정하였기 때문에, 60Hz에서 시변자계에 의한 최대 투자율을 2000 이상 확보하기 위해, 냉간압연시 압하율을 45% 이하로 제한하였다. 즉, 탄소함량이 0.02% 이상으로 높아지면 강재조직의 입자가 조밀해져 최대 투자율이 낮아지지만, 강재를 45% 이하의 저압하율로 냉간압연하면, 소둔후 입자조직크기가 커져 철의 자구(Domain, 원자들이 나란한 방향의 자극(Magnetic Pole)을 갖는 집단)가 자유롭게 움직이는 영역이 커지므로 최대투자율이 향상되는 것이다. 이에 따라, 본 발명의 냉연강판에서는 60Hz에서 시변자계에 의한 최대 투자율이 2000 이상 확보되는 것이다.In the present invention, since the carbon content is set to 0.03 to 0.06% by weight in order to secure a strength suitable for construction materials, that is, yield strength (YS) of 25 Kg / mm 2 or more, to secure a maximum permeability of 2000 or more by the time-varying magnetic field at 60 Hz. For this reason, the cold rolling reduction rate was limited to 45% or less. In other words, if the carbon content is increased to 0.02% or more, the grain structure of the steel structure becomes dense and the maximum permeability is low.However, if the steel is cold-rolled at a low pressure reduction rate of 45% or less, the grain structure of the iron becomes large after annealing. The maximum permeability is improved because the area where the atoms move in a direction where the magnetic poles move side by side is increased. Accordingly, in the cold rolled steel sheet of the present invention, the maximum permeability due to the time-varying magnetic field is ensured at 60 Hz or more.
그러나, 상기 탄소함량이 0.06%를 초과하는 경우에는, 냉간압하율을 45% 이하로 제어한다 하더라도, 입자 미세화 효과에 의해 최대투자율 2000 확보가 어렵게 되기 때문에, 바람직하지 않다. However, in the case where the carbon content exceeds 0.06%, even if the cold reduction rate is controlled to 45% or less, it is not preferable because the maximum permeability 2000 is difficult due to the particle refining effect.
한편, 상기 본 발명의 냉연강판중에는 95% 이상의 철(Fe)이 함유되는 것이 바람직하며, 또한, 상기 본 발명의 냉연강판은 건자재로 사용되는 경우, 표면에 전기아연도금 또는 용융도금 또는 크로메이트처리후 수지처리가 실시될 수 있다.On the other hand, the cold rolled steel sheet of the present invention preferably contains 95% or more of iron (Fe), in addition, the cold rolled steel sheet of the present invention, when used as a dry material, after the electro-galvanization or hot-dip plating or chromate treatment on the surface Resin treatment can be carried out.
이하, 실시예를 통하여, 본 발명을 구체적으로 설명한다. Hereinafter, the present invention will be described in detail through examples.
[실시예1]Example 1
하기 표 1에 나타난 바와 같은 조성을 갖고 서로 다른 압하율로 냉간압연된 냉연강판에 대하여, 항복강도 및 저주파 자기장 차폐능을 측정하였다. 이때, 차폐능은 시변자계(60Hz)에서의 최대투자율과 차폐 효율로 평가하였는데, 차폐효율은( 가해준 자기장-투과한 자기장)/가해준 자기장 x 100으로 계산된다.The yield strength and low frequency magnetic field shielding ability of the cold rolled steel sheets having the composition as shown in Table 1 and cold rolled at different rolling rates were measured. At this time, the shielding ability was evaluated by the maximum permeability and shielding efficiency in the time-varying magnetic field (60 Hz), and the shielding efficiency was calculated as (the applied magnetic field-transmitted magnetic field) / the applied magnetic field x 100.
한편, 하기 표 1에서 종래재(1),(2)는 순동과 순알루미늄을 나타낸다.In addition, in the following Table 1, prior art materials (1) and (2) represent pure copper and pure aluminum.
상기 표 1에 나타난 바와 같이, 순동과 순 알루미늄판인 종래재(1),(2)는 전도도는 우수하지만 최대투자율이 너무 작아 저주파 자기장 차폐소재로는 적합하지 않은 것을 알 수 있다. 또한, 비교재(2)(3)의 경우에는 최대투자율이 2000 이상 확보되어 차폐효율이 90% 이상으로 양호하지만 탄소함량이 각각 0.003%, 0.02%로 낮게 함유되어 항복강도가 건자재의 기준 25Kg/㎟ 에 미달되어 건자재 용도에 부적합한 것을 알 수 있다. As shown in Table 1, it can be seen that the conventional materials (1) and (2), which are pure copper and pure aluminum, have excellent conductivity but are not suitable as low-frequency magnetic field shielding materials because their maximum permeability is too small. In the case of the comparative materials (2) and (3), the maximum permeability is secured at 2000 or more and the shielding efficiency is good at 90% or more, but the carbon content is low at 0.003% and 0.02%, respectively, so that the yield strength is 25Kg / It turns out that it is less than mm <2> and is unsuitable for a building material use.
비교재(1)은 탄소함량이 0.04%로 항복강도가 건자재 용도에 부합되나, 냉간압하율이 50%로 높아서 최대투자율이 하락하여 차폐효율이 90% 미만으로 저하되었다. 비교재(4)의 경우에는 탄소 함유량 0.07%로 높고 냉간압하율 40%로 건자재 용도의 항복강도는 만족하지만, 탄소함량의 기준 0.06%를 초과하여 최대투자율이 하락하고 차폐효율이 90% 미만으로 저하되었다. The comparative material (1) had a carbon content of 0.04% and yield strength was suitable for construction materials, but the cold rolling rate was high at 50%, resulting in a decrease in the maximum permeability and a reduction in the shielding efficiency to less than 90%. In the case of the comparative material (4), the carbon content was as high as 0.07% and the cold rolling reduction was 40%, which satisfies the yield strength of the building material use, but the maximum permeability was lowered by exceeding the carbon content of 0.06% and the shielding efficiency was less than 90%. Degraded.
그러나, 본 발명의 발명재(1)~(3)의 경우에는 탄소함량이 0.03~0.06% 기준내에 확보되어 건자재 용도의 항복강도를 확보하였고, 냉간압하율 45%이하로 압연을 실시하여 차폐효율 90% 이상을 확보하였다.However, in the invention materials (1) to (3) of the present invention, the carbon content was secured within 0.03 to 0.06% of the standard to secure the yield strength for construction materials, and the rolling efficiency was reduced to 45% or less for cold rolling reduction. More than 90% was secured.
상술한 바와 같은 본 발명에 의하면, 저주파 전자파를 효과적으로 차폐하여 바이오 웨이브 강판의 소재로서 이용이 가능하고, 특히 저주파 전자파에 노출이 심한 송전선로 부근의 주택이나 학교 등 지역에서 활용할 수 있을 뿐 아니라, 가구용 소재로도 사용할 수 있는 효과가 있는 것이다.According to the present invention as described above, it is possible to effectively shield the low-frequency electromagnetic waves can be used as a material of the bio-wave steel sheet, in particular, it can be utilized in areas such as houses and schools near the power transmission line exposed to low-frequency electromagnetic waves, as well as for furniture There is an effect that can be used as a material.
Claims (4)
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