TW546271B - High strength steel plate with superior electric and magnetic shielding property and method for manufacturing the same - Google Patents
High strength steel plate with superior electric and magnetic shielding property and method for manufacturing the same Download PDFInfo
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- TW546271B TW546271B TW91111956A TW91111956A TW546271B TW 546271 B TW546271 B TW 546271B TW 91111956 A TW91111956 A TW 91111956A TW 91111956 A TW91111956 A TW 91111956A TW 546271 B TW546271 B TW 546271B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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- 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
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- 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
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
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- C22C—ALLOYS
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
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Description
546271 五、發明說明(l) ' — <技術領域>
I 強度鋼板明ί Ϊ於具有優f電磁遮蔽及熱浸鍍鋅特性的高 ,、I用於焦要向抗腐蝕性的場合,例如結構的 寺性:”,本發明撕 的南度鋼板,其顯示抵抗在6〇112之電磁 2 5dB的遮蔽#虛Γ4η 包琢%有 22一或更f遮蔽效率94.7%)或更高,及降伏強度為 <背景技術> 恭,多1然現象及人造電器設備會產生成電磁波形態 才 1匕動=*波電振徵電及磁場所 '址成,而與例如細胞、、 宝或人類等生物系統互相作用。己發現電磁波 地与塑r i ° ’因而導致發展各種遮蔽方法及材料。不利 〜1人肢的各種波統稱為有害波。 ,近的研究已經證實’低頻之電磁波對生物系 二3。尤其是’—系列的研究結果㈣環繞電力輸送線 =(60 Hz)與癌的發生有相互關係己在全世 大的回響。 入 :了致癌效應好,對於長時間曝露在具有磁特 J波會對人體引起電流,因而橫過細胞膜破壞了不同離· ! ’,"°Na+、K+、C1—等等的生物平衡,結果導致對人體 何爾蒙分泌及免疫細胞的不利的影變。 此外,其他的各種研究顯示磁^對於褪黑激素分泌 (:種負責規律睡眠循環的荷爾蒙)的影響,故人餅在長期 路於磁場可能家受失眠症之害。
546271 五、發明說明(2) S; I i ^ 1付此等有害的電磁波,遮蔽技術己分成兩種觀 R1 I二ft /結構及材料。關於結構觀點,磁遮蔽空間在美 國專6,282,848及曰本專利公開公報平Mm己有揭 氣導電材料,目前使用當做遮蔽電磁波,其 專利公開公報20。"1758 僅在商頻(1 KHZ或更高)電磁波。 是由+ p z之广磁'皮,通常在一般電源之所觀察到者, ΐmi分所組成,兩者皆隨時間而改。因此, 為了遮疲11^些低頻雷法曰 果),時變電及磁場心=證明對健康有不利的效 際有用的鋼板可有效;:;么考慮。然而’尚未發展出實 習慣上,使用且有j犄k電磁場。 如日本專利公開公報J H磁率的鋼板當作電磁遮蔽。例 97/Π 204 揭示 了靜能I08670 及平 1 0 — 9 60 6 7 及 pCT W0 色影像管,作為::2;蔽鋼板’可使用在例如口的彩 等鋼板’以便可利用它官上衫色調變的目的。使用此 磁力及導磁率,但不,在如地球磁場之靜態磁場下的保 板與電磁波遮蔽;然;:付時變磁及電場。因&,傳統鋼 因為场合的繁® , 過。關於此方φ,石夕_ :構材料需要不允許電磁波之透 構,如揭示在日未衷剎^軋原板被建議用在電磁波遮蔽結 200 1 - 1 0720 2。然而,、古A 開公報Μ 0 1 — 1 0 72 0 1 及 場下的高導磁率,彳曰勒11二結構材料僅利用矽鋼板在靜?磁 外,這些鋼板因Α 3 :電場的遮蔽效果則沒有揭示。此 546271 五、發明說明(3) 鍍(鍍鋅被覆特性) 此外,本案發 揭示一種鋼材料在 量為一理論質,其 電率而得到者,因 難性。因此,需要 為符合此種需 力的方法己發展出 2〇〇〇-80886 號),e 代表性者,一 方裎式1 戶 石兹遮蔽效率=〜 方程式2 戶 %遮蔽效率二〜 以d B表示單值 到: 方程式3 石兹遮蔽效應 明人在韓國專未丨& 低頻時具有♦里^案第丨9 99〜520 1 8號 扞由/二& 的磁遮蔽效果。遮蔽能 係由在靜態磁場 、蚊月匕 此當實際值不同1 斤量測的導磁率及導 作在變磁場情況下::際應用上有其困 π丨月凡下之評估。 f用方、依照頻帛評估鋼才反的磁 來(韓國專利第2 0 0 0 -799(Π號及 1前正在使用中。 鋼板的遮蔽效率可由下列方程式獲得· 于施加磁場一輻射磁場 ---X 1 0 0 所施加磁場 施加電場一輻射電場 ~----X 100 所施加電場 ’鋼板的遮蔽效應可由下列方程式得
幸虽射磁場 =-201og 546271 五、發明說明(4) 方程式4 電遮 依照這 +分之一)白 9 5 %(電磁分 應。 本案發 磁遮蔽冷礼 線輻射粉末 變磁場下獲 有碳〇. 0 2 % 關於具 不佳’因此 構的晶粒變 度。因此, 合。 此外, 或更低),古 構及家用器 就使用 須耐腐钱。 執行作熱浸 於外部環境而言 關於此方面,以 鐵鋅。然而,S i ,如結構外部 耐腐蝕材料在 的出現易於在 輻射電場 蔽效應= ______ 所施加電場 些方程式,具有遮蔽效率9〇 %(電磁波衰減至 J遮蔽材料的遮蔽效應可表為2 0 dB。遮蔽效率 L衰減至二十分之一)對應於約26dB的遮蔽效 明人之韓國專利申請案第2000-81056為基於電 鋼板的生物波鋼板,在其上被覆有輻射遠紅外 。為了改進對時變磁場的遮蔽效應,即是在時 知尚導磁率,用以遮蔽電磁波的生物波鋼板含 或更少及Si量為〇· 5〜3. 5 %。 有碳含量少於0.02%的冷軋鋼板,由於其強度 不適用於結構。在鋼板内低含碳量使得鋼微細 =車乂粗,雖然改善了磁遮蔽功效,但降低了強 含有低含碳量的冷軋鋼不適於需要高強度的場 …Μ V丨工什巾瓜、1甲长4U为 /們甚難應用到需要材料之機械成形性的與 具0 光製,矽鋼板必 此種外部光製上 熱浸鍍鋅鋼板之 多、發明說明(5) 造成鍍覆缺點,例如無鍍覆。事實上,應用至高腐蝕的環 境(例如結構光製)的電磁遮蔽鋼板,需要以鋅作熱浸鑛 鋅’至少有1 〇 〇g/mm2的被覆密度。 <發明揭示> 曰因此,本發明之一目的為克服上述先期技術的問題, 及提供一種高強度鋼板及熱浸鍍鋅鋼板,能顯示降伏強度 2jkg/mm2或更高,及基於1mm厚的鋼板,抵抗在6 0Hz之時 k電磁場有2 5 dB的遮蔽效應(遮蔽效率9 4 · 7 % )或更高。 本發明的另一目的為提供製造此種鍍鐵的方法。 人在本發明的一觀點,為提供一種高強度的鋼板,由包 t :C、N及S之總含量為0.0150%重量;A1含量為0.6%重 里或更少;Si含量為〇· 4 %重量或更少;Cu及/或Sn總含量 為0.1至〇·β% ;及餘量為以和不可避免而呈現的元素,等 之組成分製成。因而,鋼板能素現優異的電磁遮蔽能力及 熱浸鍍鋅能力。 、 本發明的另一觀點,為提供一種製造高強度鋼板的方 务’其包括步驟:提供一鋼板,其包含:C、ν及S總含量 為0.0150%重量或更少;Μη含量為0.2至0.8%重量;Α1含 量0.6%重量或更少;si含量0.4%重量或更少;Cu及/或 Sn總含量〇·ι至〇·6%重量;及餘量為“和不可避免而呈現 的元素;在1· 110至1,290 °C再加熱鋼板;在9 0 0。(:或更高 的最後變形溫度熱軋此鋼板,以得到一熱軋鋼板,及接著 將此熱軋鋼板盤曲;冷軋鋼板減少5 0 - 7 0 %及退火,因 此,鋼板可在電磁遮蔽效應及熱浸鍍鋅特性有所改進。
第10頁 546271 五 發明說明(6) c 本4¾明又另 觀點,為提供一種一種製造向強度熱浸 錄辞鋼板的方法,包括的步聚為:提供一鋼板,其包含: ::、N及S總含量為〇· 0150 %重量或更少;Mn含量為〇· 2至〇. 8%重量;A1含量為〇·6%重量或更少;si含量為〇·4%重 量或更少;Cu及/或Sn總含量為〇· 1至〇· 6 %重量;及餘量 為Fe和不可避免而呈現的元素;在丨丨^至”⑼它再加熱鋼 板’在最後變形溫度9〇〇。(:或更高熱軋鋼板,以得到熱軋 鋼板,接著盤曲此熱軋鋼板;冷軋此鋼板減少為44_7〇 % 及退火;及熱浸鍍辞此鋼板,及可選擇地使鋼板遭受表 壓輥而減少0.2-10%,因此,鋼板在電磁遮蔽效應及敎 浸鍍鋅特性可得以改善。 … <實行本發明的最佳模式> 磁場由電流產生’而電場由電壓引起。在低頻率 電及磁成分…用來當做電磁遮蔽,」種材料 必/員农減或遮蔽電及磁成分。 —材料在低頻率抵抗磁場的磁遮蔽 及使渴流損失的能力來決定。在此…=改&磁通路 有。的磁場射到一遮蔽材料時,磁〜 田 表面產生,如此磁場不會引導至^二過的路徑在材料 莫5复从, ^ . 遮威材料的内部,但被引 V至其他地方而清失。在此,渦流 '1饭引 蔽材料時,成波形態的磁場在遮蔽材二:*射到一遮 以熱的形態消失。㉚中渦流在“ 2 :表面藉由渦電流 方向循環著。*有較高導磁率的材料;:乂將磁場清失的 益處°此外,纟低頻所產生的渴流損2磁通路比較有 1知通常隨同增加遮蔽材
$ 11頁 546271 五、發明說明(7) 料的電導電 率及電導電 電場當 如此。為了 狀悲’具有 因為較高電 在本案 中’甚難精 製備樣品甚 誤差。 =導磁率而增加。因此,在60Hz具有高導磁 、鋼板展現了優異的低頻磁場遮蔽特性。 ^電勢差時而引起,即使電流並不流動亦是 古2在一遮蔽空間内誘發電場,必須為等電位 ::積電導電性的材料,期望當作電遮蔽者, V電性在防止產生電位差較為有利。 $月人所作的在時變電場,例如電 確=測量材料的電導電性及磁導磁率皮:二驗 為繁雜至在測量導電性及導磁性會產生甚大的 關於ΐ本:::,: =被測量抵抗磁及電場的遮蔽效應。 嚼 ·、 野效應藉由使用在時變磁場情況下測量磁 夕、k、的設備(韓國專利第2〇〇〇 — 79 9〇7及2〇〇〇一8〇886)來 二。,於抵抗時變場的遮蔽效應,是藉由電場強度的比 二I °電場強度係在—遮蔽空間Θ,在有遮蔽材料及 汉有遮蔽材料的情況下,使用一6〇Hzi12〇〇v〇its/ffl電壓-源’位在遮蔽屋外所量測而得者。 本發明係屬於抵抗電及磁場的高強度鋼板遮蔽。 鋼板除了 Fe外可以包含不同的成分。通常加到鐵磁性遽 Fe以改善鋼板的強度及耐蝕性的合金元素,影響鋼板在時" 變磁場(60Hz)的最大導磁率及電導電性。此外,導磁率及 電導電性隨鋼板之碳含量及晶粒大小而改變。當然,鋼板· 依據組成物顯示不同的機械特性,蓋改變強化機構,例如-固溶硬化,晶粒大小再微低等等。
第12頁
546271 五、發明說明(8) 按照本發明,提供了一種鋼板,其具有適當的強度可 使用在結構及傢倶面板,即言降伏強度為22kg/mm2,及電 磁遮蔽能力94 · 7 % ( 2 5dB)或更高。經由本案發明人等所做 的徹底及精確的實驗,其中鋼板的組成分予以改變而測量 電磁遮蔽效應及機械強度,在決定鋼板的電磁遮蔽效應及 強度時,每一成分的角色予以定義出。特別地,C、N、 S、S i、A 1、Μη及P被發現對鋼板的電磁遮蔽效應及機械強 度有甚大的影響。基於實驗的結果,可得到最佳化鋼鐵组 成分。 、
另外的實驗導致發現添加元素,例如S i、a 1及Μη的含 量與鋼板的熱浸鍍鋅有關,因而導致一種鋼組成物對於熱 浸鍍以及遮蔽效應及強度特別優越。 、… 總而言之,一種鋼板的電磁遮蔽效應大大地依填隙元 素,例如Ν、C及S,或能形成析出的元素之含量而定。例 如鋼的内應變隨C、Ν及S的含量而增加,及由於應變硬 化而增加強度。此外,填隙元素c、Ν及8析出分別成為 Fe3C、Α1Ν及MnS的形態,因此增加了鋼的強度。 然而,增加的應變及所形成之沈澱提高了鋼在導磁率 及電導電性的大大減少,因此變壞了鋼的遮蔽性能。事實 上,僅使用這些填隙元素很難提供鋼具有一 ^ 遮蔽率94.7%(25dB)或更高。 $度及 的旦;Ϊ照本發曰月,C、N 對鋼板的電磁遮蔽性能有不利 、〜音,故在鋼的組成中其和被限定至〇 · 〇丨5 %重量。 較佳地,C及N每一者含量為〇· 〇〇3〇 %或較少,妷 0 546271 五、發明說明(9) 的含量被控制0· 0 0 9 0 %,如此確保鋼具有電磁遮蔽能力及 機械成形性。 在填隙元素C、N及S以上述含$使的場合,鋼強度變 弱。為了補償由最小填隙元素引起的弱強度,需要其他元 素以引起此種固溶液硬化而增加鋼的強度。然而,必須力口 以限定使用於改良強度的元素之含量及種類,以免它們因 引起太大的減少導磁率及電導性因而削弱了電磁遮蔽效 應。特別地,添加元素的數量及種類被熱浸鍍辞的特性所 限制’因為其特性大大地受到添加元素的影響。 Μη包含 量變化,因 械特性及磁 Μη含量 貝獻於鋼板 量或更高, 應,Μη使用 Si亦包 的強度,但 在本發 量出現太多 物對鍍覆有 本發明 電遮蔽效應 發^明A 1含量 你不明鋼板内,鋼板的電遮蔽能力不隨Mn的含 為此元素並不影響電傳導性。然而,鋼板的機 遮蔽效應大大地受Μη含量的影響。 、 至0、· 2 %重量,除了確保適當的強度外,通常 勺,^蔽效應及伸長。然而,Μ ^呈現〇 · 8 %重 ^,缺點可能發生在熱浸鍍鋅上。考慮這些致 =在〇· 2至〇· 8 %重量。 二f本發明鋼板内。增加Si的含量可以增加鋼 犯減少磁遮蔽效應。 明 ,S · ,馬1的含量被限定至0 · 4 %重量。假如s i含 不刹在冷軋鋼板的表面上形成Si 02,而氧化 小刊的影塑。 / 曰 的銅;^可 ♦ 沒有明 匕& A 1 ° A 1改進鋼的程度及稍微滅少 高至〇員地減少抵抗磁場的遮蔽效應。按照本 •6%重量。A1高於〇·6%重量升高了大量
第14頁 546271 發明說明(10) 滅少鍍覆性 按照本發明’ Cu ASn包含在鋼板内。Cu及Sn被發現隨 5強度的增加發生改進電磁遮蔽效應。此外,亦發現⑸或 不會影響鋼板的熱浸鍍鋅,因為它們不像$丨及a 1立即被 氣化。
Cu及Sn改進強度的機制可藉由因⑸及以的固溶體所產 ,的硬化而解釋之。通常地,當固溶體硬化在鋼合金内發 生時,它的内應變減少導磁係數,或晶粒變細,減少了導 磁係數及導電性。不管固溶體硬化起因於加入以及/或 η二鋼板沒有顯明地降低導磁係數及導電性。相信加入這 二元素發展出磁軸< 1 0 0 >的組織但在結晶晶粒的大小 乎沒有變化。 在本毛明中’ Cu及Sn沒有明顯地減少磁遮蔽,能夠改 進鋼板的強度,能夠分別或成一起使用。 較佳地’ Cu及sn之和被限定在〇· ι〇· 6 %重量範圍内 例如,少於0· 1 %,Cu及以沒有展現它們的效應,亦沒有 ,保期望的強度(降伏強度72kg/mm2或更高)。另一方面, tCu及Sn使用總量多於〇· 6 %時,不但磁遮蔽效應減少, 而且熱浸鍍辞在鋼板上亦不能成功地執行。 、Cu&Sn與心、A1及Μη —起使用,對於電磁遮蔽及強 為有益者。在本發明中,Cll、Sn、Α1、Μη及Si的和祧ρρ 至1 %重量或更少。 此外’本發明屬於用於製造鋼板及熱浸鍍鋅鋼板的 法0
第15頁 546271 五、發明說明(11) 首先,一由上所述組成物製成的鋼板被再加熱。關於 此方面,鋼板再加熱溫度(STR)被限定在1 π 0〜1 2 9 0 °C範 圍内。 當STR低於1 Π 〇。(:時,在連續製程期間,去鱗板時間 不足’以致鱗皮缺失可能產生。或且,此種低溫少於丨丨J 〇 °C使得熱軋在兩相區域(肥粒鐵+沃斯田鐵區域)執行,因 此’例如材料特性變動的問題在鋼板内發生。另一方面, SRT高於1 29 0。(:,需要大的能源及設備成本。此外,在 1 2 9 0 C之S R T,在鋼板的表面形成的氧化物太原致不能去 鱗皮’導致表面缺失。 在SRT範圍内,(Mn、Cu、Sn)S析出物尺寸隨著溫度的 增加而增加,因此,有效地改進了電磁遮蔽能力。然而, 當溫度超過1 20 0 °C,在鋼板内再熔之(Mn、Cu、Sn)S再析 出及細緻地分散使得鋼板之晶粒尺寸小。由於細緻析出 物’晶粒尺寸之減少阻礙了在其後冷軋製程在退火步驟晶 粒之成長,發生了遮蔽效應之少微減少。 因此,SRT較佳地落在11 1 〇至1 2〇〇它範圍内。 接著,此已經再加熱之鋼板在9 〇 〇。〇或更高作最後成 形溫度(FDT)的熱軋。當FDT低於9 0 0。〇,兩相區域(肥粒鐵 +沃斯田鐵)遭受滾軋,如此使得材料特性改變,及表面 形成如橘子剝皮之缺失。因這些理由,FDT被限定於9〇〇 〇c 成更少。 其後,此經熱軋之鋼板予以盤曲。較佳地,盤曲溫度 (CT)被限定在610至750 t内,因為冷軋產物之晶粒尺寸被
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546271
在熱軋之後熱軋鋼板
少於61〇它,曰 板的晶粒大小所影響。詳細而言,在CT 750 °Γ ^ ^ ^ +足夠地成長。在另一方面,CT高於 750 C可犯不允許晶粒再成長。 之後,此盤曲,勃⑹ A t 退火。 “、、軋之鋼板以酸作酸洗,接著冷軋及 定。具 因此改 要者, 之有大 因 軋組織 再結晶 然而, 形狀變 另 變成太 為 至70 % 有大晶粒尺寸 善了磁遮蔽能 因為製程可改 的影響。 為在冷軋期間 幾乎沒有被破 )的數目減少 在連續冷軋期 得困難。此外 一方面,在太 細因而衰減了 了這些理由, 的遮蔽效應大大地依其晶粒尺寸而 之鋼板允許磁區在晶粒内自由移動, 力。因此,控制冷軋製程之情況為重 變晶粒之尺寸,因而在電磁遮蔽效應 縮減,百分率為低者,在冷軋後之熱 壞。因此,成核位置(當退火時發生 所以在退火後晶粒尺寸可能增加。 間之低縮減少百分率,使得控制鋼板 ’生產效率在縮減百分率時變低。 馬的縮減百分率,冷軋鋼板的結晶粒 鋼板的電磁遮蔽效應。 本發明之冷軋縮減百分率被限定在5 〇
其後,此冷乾鋼板在典型的情況下被退火以獲得高強 度冷軋鋼板,除了具有優異的熱浸鍍鋅特性外,其具有降 低強度22kg/mm2或更高及在60Hz的時變電磁場下,具有 94· 7 % (25dB)或更高的遮蔽效率。 為了提供包含上述組成物的鋼板的抗腐蝕性,其可以
第17頁 546271 五、發明說明(13) 抗腐餘元素,例如録赤叙;,、,&、夺μ , i"、以“二 熱浸鍍。在熱浸鍍鋅後,鋼 a又々&毹,以控制鋼板的形狀及粗糙。 :而,表皮廢輥降低了在時變磁場下的導磁率,因此 鋼板的磁遮蔽效應1而,如扳扭曲的缺點,沒有 表皮壓輥是不能被控制的。因此’表皮壓輥盡可能 好。 為了避免如板扭曲的缺點,至少〇 2%的伸長為需要 另一方面’當縮減百分率超過1〇%,劇烈的由應變 子入鋼板内’因而大大地降低了電磁遮蔽效應。因此, 在本發明中,表皮壓輥最好在縮減百分率〇 2至1〇%情況 下進行。 此種表皮壓輥可有效地迂迴過鋼板的扭曲,此板扭曲 係歸因於冷軋縮減百分率低於44 —5 5 %。因此,當表皮輥 f執仃時,冷軋輥壓縮減百分率可由5〇 %擴大至〇 %。換 、吕之,在本發明中可省略表皮壓輥,因為板扭曲在冷軋縮 減百分率在50-70%範圍内並不發生。 、如上所述之組成物的高強度鋼板,可由以辞或鋁的熱 浸鍍而改善耐腐I虫。 與未被覆冷軋鋼板之比較,熱浸鍍辞鋼板在電磁遮蔽 能力有稍微的增加,但降伏強度則減少。此係因為冷軋鋼 板由鋅被覆在其上,辞較鐵有高的電導性但強度較弱。然 而’在熱浸鑛鋅鋼板及裸板間在電磁遮蔽及強度沒有可察 覺到的區別。 鍍覆方法並無限定本發明之鋼板的應用。因為熱浸鍍 1 第18頁 546271 五、發明說明(14) 鋅鋼板通常可由電鍍製成,本發明 以如鋅及鋁的抗腐蝕元素予以被覆。,板可以電鍍方式, 命/f f本發明,鋼板可以一層有機樹脂居+ 便在鋼板上表現一種顏色。在以 7層予以被覆,以 後,此稱為預被覆金屬之鋼板保持了如2含顏料被覆 效應及機械特性,此因為含在樹脂=寺性之電磁遮蔽 厚度僅25 # m薄。 &顯料為非磁且被覆 土按照本發明,具有輻射效率(發射率 运紅外輻射放射粉末可在鋼板丰)為〇· 9或更高的 的,度。較佳.,此外外線至^ W/g或更高及包含17_99%的社(〇11)2。末之此表面積為 對本發明己作概括性的敘述,對 可藉由參照某些特定範例而得到,這;f ::的了解 而提供,除外特別申明並不用於 ;J僅為揭不目的 例1 予以ίΐ成物以不同的Cu、Sn含量以如下之如表1所示者 中,:成乂Okg的每一種鋼組成物作真空融熔。在表】 含旦夂L思為沒有添加元素,在每一種組成物巾,C及N 里二.〇〇3〇%或更少,而S的含量控制在0.0090%。 德燃i解之組成物在125〇°C再加熱,及維持於9〇〇°C的最 由^ =溫度予以熱軋,以獲得2mm厚的熱軋鋼板。熱軋鱗 馱洗自鋼板除去之。酸洗熱軋鋼板被冷軋至lmm厚, 六目^百分率50 %。其後’使用一連續的退火摸擬器,退火 c予以執行以製得冷軋鋼板。鋅以使用熱浸鍍鋅模 546271 五、發明說明(15) 擬器被覆在每一冷乳鋼板上’被覆您度3 g / m 。 藉由一電磁遮蔽效應分析器之助,每一熱浸鍵辞鋼板 在60Hz量測電磁遮蔽效應,其結果列下表之表1。此外’ 例如降伏強度及伸長,藉由一萬用測試機綜合如下之表 1 ° 經由裸眼觀察而決定及測試被覆粘著’熱浸鍍鋅鋼板 的被覆性如為良好狀態,在表1中表示為、、〇〃 ’有致命 被覆缺點以、、X "表示。 表1
組成物 號碼 成 分(W1 t°/o) 磁遮敝 (dB) 電遮敝 (dB) 降伏強度 (kg/mm2) 熱浸鍍 覆性 Si A1 Mn P Cu Sn 比較1 Tr Tr Tr Tr Tr Tr 28.2 41.5 14.2 〇 比較2 0.6 Tr 0.2 Tr Tr Tr 25.5 38.2 27.4 X 比較3 0.8 Tr 0.2 Tr Tr Tr 22.8 38.0 28.6 X 比較4 0.3 0.6 0.2 Tr Tr Tr 21.6 37.7 26.3 X 比較5 Tr Tr 0.2 Tr Tr Tr 28.2 40.7 18.0 〇 比較6 0.2 Tr 0.2 Tr Tr Tr 28. 1 40.5 22.0 〇 比較7 Tr 0.2 0.2 Tr Tr Tr 26.9 40.5 20.6 〇 1 Tr Tr 0.2 Tr 0· 1 0.1 27.8 40.8 22.3 〇 2 Tr 0.2 0.2 Tr 0.3 0.3 25.4 40.1 25.7 〇 3 0.2 Tr 0.2 Tr 0.2 0.2 27.6 40.2 25.4 〇 4 0.2 Tr 0.2 Tr Tr 0.5 25.4 40.3 26.3 〇 5 0.2 Tr 0.2 Tr 0.5 Tr 25.1 40. 1 26.7 〇 比較8 Tr Tr 0.2 Tr 0.03 0.02 27.3 40.8 18.8 〇 比較9 0.2 Tr 0.2 Tr 0.4 0.4 21.8 39.5 27.9 X
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五、發明說明(16) 由表1的數據顯然可知,本發明的鋼板(組成物號碼1 及2 ) ’在按照本發明所定義範圍内的c u、S η及S i之每一 - 者,顯示了優異的強度,沒有犧牲電磁遮蔽效應。另外, 發現鋼板有優異的鍍覆性。 相反地’比較組成物號碼1,沒有C u、S η及S i,雖然 . 遮蔽效應優異,但強度低,在本發明不適用。在S i含量超 過〇 · 4 % (比較組成物號2及3 ),鍍覆性劣及因為有未被覆 〜 區域,鍍覆缺點被看出。 . 比較組成物號4至7,包含有Μη及/或Si,但沒有Cu或”
Sn,僅顯示在18至22kg/inm2的強度,沒有達到所需要的強 f 度22kg/mm2或更高,此外,其中有一些表現高強度(> 22kg/mm2),但不能作熱浸鍍鋅。特別地,當Si、A1及Μη 之和超過1 · 0 % (比較組成物號碼4)時,看到減少的電磁遮 蔽效應,尤其是熱浸鍍鋅特性大大地衰減。 - 當Cu及Sn的和低於0. 1 %(比較組成物號碼8),遮蔽效 應及熱浸鍍辞特性為優異者,但強度太低。另一方面,當 Cu及Sn之和超過〇. 6 %(比較組成物號碼9),強度太高,但 發現磁遮蔽效應及熱浸鍍辞特性劇烈地減少。 例2
30kg的組成物包含:C,含量0.003%或更少;N,含 量0.003%或更少;Μη,含量0.2% ;A1,含量0.2% ;
Si,含量0.2% ;Cu,含量0.2% ;及Sn,含量0.2%,等 作真空熔融。經熔融之鋼板,在不同的溫度情況,包括再 加熱溫度,最後成變形溫度,及盤曲溫度,被製成熱軋鋼
第21頁 546271 五、發明說明(17) ___ 板,每一者2mm厚。鋼板以酸洗除去其上的埶 , 些經酸洗冷軋鋼板被泠軋成丨mm厚,縮減百八4皮。這 其後,使用_連續退火摸擬器,在85〇 二竿為50 %。 得冷軋鋼板。 订退火,以製 藉由一電磁遮蔽效應分析器之助,> QHz里測電磁遮蔽效應’其結果列於、、、冷礼鋼板在 板的機械特性如降伏強度藉由使用一述表2。此外,鋼 和在表2。以裸眼觀察,這些冷札鋼一通、用測試機量測並综 上所出現的鱗板。 乂決定在它們表面
鋼 號 埶 軋 磁遮蔽 碼 SRT FDT CT (dB) 1 1250 910 700 25.3 2 1200 910 700 25.4 3 1150 910 700 26· 5 比較1 1100 910 700 27.2 比較2 1150 895 700 29.2 比較3 1150 870 700 24.7 4 1150 900 700 26· 4 5 1150 900 750 26.5 6 1150 900 650 26.2 比較4 1150 900 600 24.5
546271 五、發明說明(18) 由表2可看出’本發明的鋼板(鋼號碼1至6 )’皆在適 當控制的再加熱及盤曲溫度製成,具有優異的電磁遮蔽特 性及皆被徹底地去鱗皮而沒有形成熱乳鍵覆缺點。 特別地,當鋼板再加熱溫度(S R T)在本發明所定義的 範圍内時,電磁遮蔽效應大大地增加。電磁遮蔽效應的改 進相信昃由於(Mn、Cu、Sn)S,Mn、Cu及Sn成分及雜質S的 聚集體,沒有新析出,所以(Μη、Cu、Sn)S析出及晶粒大 小保持粗。 在鋼號碼1及2的情況,其中S R T超過1 2 0 0 °C,徹底地 進行去鱗皮以防止表面缺點,但在再加熱後,在冷却步驟 期間,新析出(Mn、Cu、Sn)S發生,使得晶粒小。因為這 些理由,鋼號碼1及2的鋼板的電磁遮蔽效應較鋼號碼3至β 者為低。因此,S R Τ較佳地被限定在1 π 〇至1 2 〇 〇 °c範圍 内0 藉由對比’在S R T少於1 1 1 0 C (比較鋼號碼1 ),對確保 有一足約的去鱗皮時間有困難。因此,在冷軋鋼板的表面 上形成缺點,這些缺點保留至熱軋鍍鋅的鋼鐵表面上。 在FDT低於9 0 0 °C ’兩相區域(肥粒鐵+沃斯田鐵區域) 被滾軋以致產生材料改變及板扭曲,伴隨無數表面缺失 (比較鋼號碼2及3 )。 此外’在盤曲溫度少於600 t(比較鋼號碼4),因為晶 粒變小,發現電磁遮蔽效應劇烈減少。 由表2顯然可知,高的盤曲溫度傾向於增加電磁 能力’但減少強度。以係因為晶粒在高的溫度成長,而發
i 546271 五、發明說明(19) 生在時變電磁場下導磁率及導電性的改進。 例3 30kg的組成物包含,含量0.003%或更少;n,含 量0,003%或更少;S,含量0·008% ; Μη,含量0.2% ; ,含量 0.2% ;Si,含量 〇·2% ;Cu,含量 0.2% ;及 Sn,含量〇. 2 %,等作真空熔融。 在1 2 0 0 °C再加熱後,熔融之組成物被製成熱軋鋼板, 其厚度為2·0、3·0及4.0mm,而FDT及CT分別設定91〇及68(
°C。然後,這些鋼板在如表3之不同的縮減百分率下被冷 軋成1 mm厚。在85 0 〇C進行退火,垃芏^ 覆密度lSGg/mM。某些熱浸錄鋅銅不U鑛辞至凝 遭受表皮親壓。 _以不同的縮減百分率 藉由電磁遮蔽效應分析器之助, 鋼板的電磁遮蔽效應,結果列於下量測每一冷軋 機械特性(降伏強度)藉由一通用、表3 °此外,鋼板的 表3。藉由裸眼觀看冷軋鋼板以武機予以量測及綜合於 决疋的缺點(板的扭曲)。 546271 五、發明說明(20) 表3 冷軋縮減 比例(%) SPM比例 (%) 磁遮蔽 MR) 電遮蔽 (dB) 降伏強度 (kg/mm2) 外形
比較4 23· 5 39· 7 26.0 優異 在表3可看出本發明之鋼板(鋼號碼1至6),冷軋縮減 百分率範圍由44至70 %,且經歷表皮輥壓減縮百分率〇·2 ^ 1 · 0 ,白具有優異的電磁遮蔽效應且沒有外形的變 形鋼唬碼1及2,其冷軋減縮百分率控制在5 〇〜7 〇 %範圍 内,顯不了優異的電磁及機械特性及優異的形狀,即使沒 — 有進行表皮輥壓亦是如此。 作為對比,由比較鋼號碼1,其縮減百分率少於5 〇 % · 作冷軋及沒有遭受表皮輥壓,可看出鋼板扭曲之缺失。當_ 冷軋縮減百分率超過7〇 %(比較鋼號碼2及3),電磁遮蔽效
546271 五、發明說明(21) 應劇烈減少。 在表皮輥壓縮減百分率多於1 〇 廄傲;2丨 义、丄· u义(比車父鋼號碼4 ),大 w艾引入鋼内’在時變電磁場下 兒琢琢卜’導磁率及莫雷漆減少 因而電磁遮蔽效應減少。 千次V電羊減夕, 產業上可用性 為有ί ΐ述m,1Cu ASn的含量對於製造鋼板及艘鋅麵板 Rn 、:而且可表現1 2kg/mm2或更高的降伏強度及在 鹿^的時變電磁場下有94· 7 %或更高(25dB或更高)的遮蔽
第26頁 546271
第27頁
Claims (1)
- 546271 ____ · 1 · 一種高強度鋼板,其内包括:C、N及s,總含量為 0.0150%重量或更少;Μη,含量〇·2至0.8%重量;A1,含 量〇·δ%重量或更少;Si,含量0.4%重量或更少;Cu及/ 或Sn ’總含量〇·;!至〇·6%重量;及餘量為卜和不可避免所 王現的元素,等之組成物所製成,藉此,鋼板表現優異電 磁遮蔽效應及熱浸鍍鋅特性。 2·如申請專利範圍第1項之高強度鋼板,其中Μη、 Cu、Sn、Si及Α1總含量為1·〇%重量或更少。 ^ 3 .如申請專利範圍第1項之高強度鋼板,其中C及Ν含 里各有0.0030%重量或更少,及s含量為〇〇〇9〇%重量或 更少。 4·如申請專利範圍第1項之高強度鋼板,其中鋼板在 jnn厚,有25dB或更高的電磁遮蔽效應,及顯示22 或更高的降伏強度。 -4 t如巾請專利範圍第1至4項之高強度鋼板,其中包义 一抗腐蝕兀素,被覆在熱浸鍍鋅上。 τ 6.如申請專利範圍第5項之高強度鋼板,其中又 一有機樹脂被覆在熱浸鍍鋅上。 匕括 7 ·如申請專利範圊筮R s ^成土 員之尚強度鋼板,其中執浸參 為15〜60 。 〜射私末予以覆盍,其在厚j 8 ·如申請專利範圍第7 ^ 45 4+ ^ 4+ φν φ @ ^ 貢之巧強度鋼板,其中遠外後 輪射發射粉末具有比面積丨2 / 疋外跟 %重量。 ^lm/g及包括Mg(OH)2含量17〜99546271 六、申請專利範圍 9 · 一種用於製造高強度鋼板的方法,包括之步驟為: 提供一鋼板,其包含:C、N及S,總含量為0· 0150 % 重量或更少;Μη,含量〇·2至0.8%重量;A1,含量0.6% 重量或更少;Si,含量0.4%重量或更少;Cu及Sn,總含 量0.1至0.6%重量;及餘量為以和不可避免所呈現的元 素,等之組成物所製成; 在1110至1290 C再加熱鋼板; 在最後變形溫度90 0 °C或更高,熱軋鋼板,此製得熱 軋鋼板,接著盤曲此熱軋鋼板; 冷軋鋼板,縮減百分率為5 〇〜7 〇 %,及退火; 藉此,鋼板的電磁遮蔽效應可以改進。 10.如申請專利範圍第9項之方法,其中Mn、Cu、Sn、 S i及A 1總含量為1 · 0 %重量或更少。 1 1 ·如申請專利範圍第9項之方法,其中c及n的含量各 有0.0030%重量或更少,及s含量為0.0090%重量或更 少 0 12. 如申請專利範圍第9項之方法,其中再加埶步驟在 1110 至 1 200 °C 執行。 13. 如申請專利範圍第9項之方法,其中鋼板在61〇〜 7 5 0 °C予以盤曲。 1 4 · 一種製造高強度熱浸鍍鋅鋼板的方法,其包括步 驟為: ^ 提供一鋼板,其包含:c、N&s,總含量為〇· 〇15〇 % 重量或更少;Μη,含量〇.2至〇 8%重量;M,含量第29頁 546271 六、申請專利範圍 重量或更少;Si,含量0· 4 %重量或更少;Cu及Sn,總含 量0· 1至〇· 6 %重量;及餘量為Fe和不可避免所呈現的元 素,等之組成物所製成; 在111 0至1 2 9 0 °C再加熱鋼板,在最後變形溫度9 〇 〇 或更高熱軋鋼板,以獲得一鋼板,及盤曲此鋼板; 冷軋鋼板,縮減百分率為44〜70 %及退火;及 熱浸鍍鋅此鋼板,及可選擇地使鋼板遭受表皮壓親縮 減百分率〇 . 2〜1. 〇 % ; 因此,鋼板可在電磁遮蔽效應及熱浸鍍鋅特性獲得改 善。 1 5·如申請專利範圍第14項之方法,其中執行冷乾步 驟在縮減百分率5 0〜7 〇 %執行及表皮壓輥省略。 1 6 ·如申請專利範圍第1 4項之方法,其中Mn、、 S η、S i及A 1總含量為1. 〇 %重量或更少。 η·如申請專利範圍第14項之方法’ #中 f有0.0030%重量或更少,及s含量為〇〇〇9〇%重量戋更 18.如申請專利範圍第14項之方法,其 750 °C予以盤曲。
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