JP3160003B2 - Magnetic alloy steel strip without adhesion in magnetic annealing - Google Patents
Magnetic alloy steel strip without adhesion in magnetic annealingInfo
- Publication number
- JP3160003B2 JP3160003B2 JP08726391A JP8726391A JP3160003B2 JP 3160003 B2 JP3160003 B2 JP 3160003B2 JP 08726391 A JP08726391 A JP 08726391A JP 8726391 A JP8726391 A JP 8726391A JP 3160003 B2 JP3160003 B2 JP 3160003B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- annealing
- adhesion
- steel strip
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 15
- 239000010959 steel Substances 0.000 title claims description 15
- 229910001004 magnetic alloy Inorganic materials 0.000 title claims description 13
- 238000000137 annealing Methods 0.000 title description 25
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 10
- 238000005524 ceramic coating Methods 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 4
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 description 15
- 238000000576 coating method Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 238000007796 conventional method Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 229910018106 Ni—C Inorganic materials 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 102220479482 Puromycin-sensitive aminopeptidase-like protein_C21D_mutation Human genes 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Landscapes
- Chemical Treatment Of Metals (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Description
【産業上の利用分野】本発明は磁気シールド部品や各種
鉄心部品として使用されるＦｅ−Ｎｉ，Ｆｅ−Ｎｉ−Ｃ
ｒ系軟質磁性合金鋼で、部品加工後の磁気焼鈍時に生じ
る部品相互の密着の防止技術の改良に関する。より具体
的に言えば、前記合金の帯および板であって、セラミッ
クの皮膜を施したものに関する。本発明の製品は、鋼帯
もしくは鋼板の形で市場に提供されるが、本明細書にお
いては鋼帯の呼称に鋼板をも含むものとする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to Fe-Ni, Fe-Ni-C used as magnetic shield parts and various iron core parts.
The present invention relates to an improvement in a technique for preventing adhesion between components of an r-based soft magnetic alloy steel that occurs during magnetic annealing after component processing. More specifically, it relates to strips and plates of the alloy, which are provided with a ceramic coating. Although the product of the present invention is provided to the market in the form of a steel strip or a steel sheet, in the present specification, the term steel strip includes a steel sheet.
【０００２】[0002]
【従来の技術】磁気ヘッドケース、カバー材など各種の
磁気シールド部品や時計、小型変成器のコアーを代表と
する鉄心部品にはＪＩＳＣ２５３１に規定されるＰＢ
（４６Ｎｉ），ＰＣ（８０Ｎｉ）およびこれらを改良し
たＦｅ−（３０〜５０％）Ｎｉ−Ｃｒ系合金が広く利用
されている。2. Description of the Related Art Various magnetic shield parts such as a magnetic head case and a cover material, iron core parts typified by a core of a timepiece and a small transformer are PB specified in JISC2531.
(46Ni), PC (80Ni), and Fe- (30-50%) Ni-Cr alloys obtained by improving these materials are widely used.
【０００３】一般に、これらの磁性合金は鋼帯より打抜
き加工や絞り加工を行なった後、磁気特性を発揮させる
ために磁気焼鈍を施こす。磁気焼鈍は水素雰囲気中で９
００〜１２００℃×０．５〜２ｈｒの高温長時間で行わ
れるため加工部品の数量がかさむ場合には、焼鈍時に部
品どうしで密着するという問題が生じる。In general, these magnetic alloys are subjected to punching or drawing from a steel strip and then subjected to magnetic annealing in order to exhibit magnetic properties. Magnetic annealing is 9
Since the process is performed at a high temperature of 0.5 to 2 hours at a temperature of 00 to 1200 ° C. for a long time, when the number of processed parts increases, there arises a problem that the parts adhere to each other during annealing.
【０００４】それゆえ、従来より、数量の多い加工部品
を一度に焼鈍する場合には、多量のアルミナ（Ａｌ
2Ｏ3）粉末中に加工部品をちりばめて磁気焼鈍を行って
部品間どうしの密着を防止していた。Therefore, conventionally, when a large number of processed parts are annealed at once, a large amount of alumina (Al
2 O 3 ) The processed parts were studded in the powder and magnetic annealing was performed to prevent the parts from adhering to each other.
【０００５】[0005]
【発明が解決しようとする課題】近年の電子、磁気産業
の発展にともなってＦｅ−Ｎｉ，Ｆｅ−Ｎｉ−Ｃｒ系磁
性合金の使用も増大し、小型化、軽量化が進んできた。
そのためアルミナ粉末を用いて磁気焼鈍を行なうと多量
のアルミナ粉末を使用するうえ、焼鈍後の部品のふるい
分け、加工部品の洗浄などに手間がかかり、コスト高を
まねくという問題があった。With the recent development of the electronics and magnetic industries, the use of Fe--Ni and Fe--Ni--Cr based magnetic alloys has been increased, and their size and weight have been reduced.
Therefore, when magnetic annealing is performed using alumina powder, a large amount of alumina powder is used, and sieving of the annealed parts, cleaning of the processed parts, and the like are troublesome, resulting in an increase in cost.
【０００６】本発明は、Ｆｅ−Ｎｉ系、Ｆｅ−Ｎｉ−Ｃ
ｒ系軟質磁性合金で、部品加工後の磁気焼鈍時に、アル
ミナ粉末を使用しなくても部品相互の密着防止を可能に
することを目的とする。[0006] The present invention relates to Fe-Ni-based, Fe-Ni-C
An object of the present invention is to provide an r-based soft magnetic alloy capable of preventing parts from adhering to each other without using alumina powder during magnetic annealing after parts processing.
【０００７】[0007]
【課題を解決するための手段】本発明の要旨とするとこ
ろは、Ｆｅ−ＮｉおよびＦｅ−Ｎｉ−Ｃｒ系軟質磁性合
金の表面をアルミナ、シリカ、チタニアあるいはジルコ
ニアのうち１種以上を含む厚さ５０オングストローム以
上の皮膜を合金表面に形成することを特徴とし、磁気焼
鈍時における加工部品相互間の密着のない磁性合金鋼帯
を提供するところにある。The gist of the present invention resides in that the surface of a Fe--Ni or Fe--Ni--Cr soft magnetic alloy has a thickness containing at least one of alumina, silica, titania and zirconia. An object of the present invention is to provide a magnetic alloy steel strip in which a coating of 50 angstrom or more is formed on an alloy surface and there is no adhesion between processed parts during magnetic annealing.
【０００８】[0008]
【発明の具体的開示】以下に本発明について詳細に説明
する。本発明者らは、Ｆｅ−ＮｉおよびＦｅ−Ｎｉ−Ｃ
ｒ系軟質磁性合金の磁気焼鈍時の密着を防止するため
に、合金表面に種々のセラミックコーティングを行なっ
た。DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail. We have found that Fe-Ni and Fe-Ni-C
Various ceramic coatings were applied to the surface of the r-type soft magnetic alloy in order to prevent adhesion during magnetic annealing.
【０００９】表１に、ＪＩＳ−ＰＣ級のＦｅ−８０Ｎｉ
−５Ｍｏ合金およびＦｅ−４６Ｎｉ−３Ｃｒ合金板を用
いてゾル-ゲル法によりコーティング組成と膜厚を変化
させて皮膜を施した試料について磁気焼鈍を行い密着の
有無を試験した結果を示す。これらの試料はコーティン
グ液をディッピングにより塗布し、３００℃程度で焼成
したものである。この表より表面皮膜としてアルミナ、
シリカ、チタニア、またはジルコニアのうちの一種以上
を５０オングストローム以上コーティングすることによ
り磁気焼鈍時における密着を防止できることが明らかと
なった。Table 1 shows JIS-PC grade Fe-80Ni.
The results of a magnetic annealing test on samples coated with -5Mo alloy and Fe-46Ni-3Cr alloy plates by changing the coating composition and film thickness by a sol-gel method and testing the presence or absence of adhesion are shown. These samples were obtained by applying a coating solution by dipping and firing at about 300 ° C. From this table, alumina as the surface film
It has been clarified that the adhesion during magnetic annealing can be prevented by coating at least one of silica, titania, and zirconia with 50 angstrom or more.
【００１０】なお、セラミックコーティング方法は、ゾ
ル-ゲル法や溶射などが知られているが、５０オングス
トローム以上の皮膜厚さを得ることができるものであれ
ばよく、特にその方法は限定されるものではない。As the ceramic coating method, a sol-gel method or thermal spraying is known, but any method can be used as long as a film thickness of 50 Å or more can be obtained, and the method is particularly limited. is not.
【００１１】一方、皮膜の厚さを５０オングストローム
以上にすることにより、本発明課題を達成することはで
きるが、皮膜厚さが厚くなるのに伴って部品としてプレ
ス加工する場合に、打抜き形状がくずれたり、コーティ
ング膜の剥離が生じたりする。表１に示すプレス加工性
は、コーティング膜厚さと加工による剥離の有無の関係
を試験した結果を示す。プレス加工試験は切り出した試
片をＶ型の溝を有するブロック（金敷）上に載せてＶ字
の頂点の位置にある平たがね状押棒で押してＶ字型に曲
げ、コーティング膜の剥離の有無および加工形状の良、
不良により評価した。On the other hand, the object of the present invention can be achieved by increasing the thickness of the coating to 50 Å or more. However, when the coating is pressed as a part as the coating thickness increases, the punched shape becomes smaller. Deformation or peeling of the coating film occurs. The press workability shown in Table 1 shows the results of testing the relationship between the coating film thickness and the presence or absence of peeling due to processing. In the press working test, the cut specimen was placed on a block (anvil) having a V-shaped groove, and was pressed into a V-shape by pressing it with a flat-shaped push bar at the top of the V-shape to remove the coating film. Good presence and processing shape,
It was evaluated based on the failure.
【００１２】プレス加工試験の結果より、コーティング
膜の厚さが、５０００オングストローム以上では加工性
が劣っていること、また過剰の厚さにコーティングする
ことはコスト的にも好ましくないことから、コーティン
グ膜の厚さは５０００オングストローム以下が好まし
い。According to the results of the press working test, when the thickness of the coating film is more than 5000 angstroms, the workability is inferior, and coating at an excessive thickness is not preferable in terms of cost. Is preferably 5000 angstroms or less.
【００１３】以上のアルミナ、シリカ、チタニアあるい
はジルコニアのコーティングによる磁気焼鈍時の密着防
止効果は、板表面の酸化物により、金属母材間の元素拡
散による接合を妨げることによると考えられる。The above-described effect of preventing adhesion during magnetic annealing by coating of alumina, silica, titania, or zirconia is considered to be due to the fact that the oxide on the plate surface prevents bonding due to element diffusion between metal base materials.
【００１４】次に実施例について述べる。 実施例１ 板厚０．６ｍｍのＪＩＳ−ＰＢ（Ｆｅ−４６Ｎｉ）磁性
合金鋼帯に膜厚３００オングストロームのアルミナ膜を
連続的にコーティングし、３５０℃×１分の条件で焼成
した。このコイルから時計鉄心部品用としてのコアーを
５０００個打抜き、バッチ型の焼鈍炉で、水素気流中１
１００℃×２ｈｒの磁気焼鈍を行なった。表２に焼鈍後
の密着部品数と不良率をセラミックス・コーティングし
ない場合の従来法と比較して示した。焼鈍時にアルミナ
粉末を用いる従来法でもセラミックス・コーティングを
行なう本発明法でも５０００個のコアー部品に対して密
着不良率が０．４％でほぼ同程度である。これより、本
発明のセラミックス・コーティングにより従来法と同様
な密着防止を可能にできる。Next, an embodiment will be described. Example 1 A 300-Å-thick alumina film was continuously coated on a JIS-PB (Fe-46Ni) magnetic alloy steel strip having a thickness of 0.6 mm, and fired at 350 ° C. for 1 minute. 5,000 cores for watch core parts were punched out of this coil, and were placed in a batch type annealing furnace in a hydrogen stream.
Magnetic annealing at 100 ° C. × 2 hr was performed. Table 2 shows the number of adhered parts and the defective rate after annealing in comparison with the conventional method without ceramic coating. In the conventional method using alumina powder at the time of annealing or the method of the present invention in which ceramic coating is performed, the adhesion failure rate of 5,000 core parts is almost the same at 0.4%. Thus, the ceramic coating of the present invention can prevent adhesion as in the conventional method.
【００１５】実施例２ 板厚０．３ｍｍのＦｅ−３８Ｎｉ−８Ｃｒ磁性合金鋼帯
に膜厚１０００オングストロームのチタニア−シリカ系
の膜を連続的にコーティングし、３００℃×１分の条件
で焼成した。この鋼帯から磁気ヘッド部品用カバー材と
して３０００個の打抜き、絞り加工を施した。その後、
この加工部品を連続型の焼鈍炉で、水素−窒素の気流中
１０５０℃×１ｈｒの磁気焼鈍を行なった。Example 2 A 0.3 mm thick Fe-38Ni-8Cr magnetic alloy steel strip was continuously coated with a 1000 angstrom-thick titania-silica film and fired at 300 ° C. for 1 minute. . From this steel strip, 3000 pieces were punched and drawn as a cover material for magnetic head parts. afterwards,
This processed part was subjected to magnetic annealing at 1050 ° C. × 1 hr in a stream of hydrogen-nitrogen in a continuous annealing furnace.
【００１６】表３に焼鈍後の密着部品数と不良率をセラ
ミックス・コーティングしていない従来法と比較して示
した。この表より明らかなように本発明法によりセラミ
ックス・コーティングを行なうことで、焼鈍時にアルミ
ナ粉末を使用する従来法と同程度の密着防止を可能にで
きる。Table 3 shows the number of adhered parts and the defective rate after annealing in comparison with the conventional method without ceramic coating. As is clear from this table, by performing the ceramic coating according to the method of the present invention, it is possible to prevent adhesion as much as the conventional method using alumina powder at the time of annealing.
【００１７】[0017]
【効果】以上、本発明によれば、磁気焼鈍時に多量のア
ルミナ粉末を用いることなく、加工部品どうしの密着を
防止することができるため、磁気焼鈍前後の部品取扱い
の手間が省け磁気焼鈍にかかるコストを大幅に削減でき
る磁性合金鋼帯を提供できる。As described above, according to the present invention, it is possible to prevent adhesion between processed parts without using a large amount of alumina powder at the time of magnetic annealing. A magnetic alloy steel strip that can significantly reduce costs can be provided.
【００１８】[0018]
【表１】 実験No. 供試材 コーティング膜 磁気焼鈍後 プレス加工性 組 成 膜厚※ の密着 １ Fe-80Ni-5Mo＊ − 0 有 良 ２ アルミナ 30 有 〃 ３ 〃 500 無 〃 ４ 〃 3000 〃 〃 ５ アルミナ-シリカ 50 〃 〃 ６ 〃 1000 〃 〃 ７ ジルコニア 200 〃 〃 ８ 〃 7000 〃 不良 ９ チタニア 150 〃 良 10 〃 800 〃 〃 11 シリカ-シ゛ルコニア 40 有 〃 12 〃 2000 無 〃 13 〃 6000 〃 不良 14 Fe-46Ni-3Cr シリカ 80 無 良 15 〃 400 〃 〃 16 〃 2500 〃 〃 17 アルミナ-シ゛ルコニア 20 有 〃 18 〃 7000 無 不良 19 アルミナ 30 有 良 20 〃 500 無 〃 21 〃 1500 〃 〃 22 チタニア-シ゛ルコニア 40 有 〃 23 〃 5500 無 不良 ＊ JIS PC ※ オングストローム[Table 1] Test No. Test material coating film After magnetic annealing Press workability Adhesion of the pair formed a film thickness ※ 1 Fe-80Ni-5Mo *-0 Yes Good 2 Alumina 30 Yes 〃 3 〃 500 No 〃 4 シ リ カ 3000 〃 ５ 5 Alumina-silica 50 〃 ６ 6 〃 1000 〃 ７ 7 Zirconia 200 〃 ８ 8 7000 7000 不良 Bad 9 Titania 150 良 Good 10 〃 800 〃 〃 11 Silica-silconia 40 Yes 〃 12 〃 2000 No 〃 13 〃 6000 不良 Poor 14 Fe-46Ni-3Cr Silica 80 No Good 15 〃 400 〃 〃 16 〃 2500 〃 〃 17 Alumina-siliconia 20 Yes 〃 18 〃 7000 No Defect 19 Alumina 30 Yes Good 20 〃 500 No 〃 21 〃 1500 〃 〃 22 Titania-Sirconia 40 Yes 〃 23 〃 5500 No Defect * JIS PC * Angstrom
【００１９】[0019]
【表２】 セラミックス 焼鈍時の 密着サンプル数 不良率 コーティング膜 アルミナ粉使用 （個） （％） 比較例 なし なし 3850／5000 77 従来法 なし あり 22／5000 0.44 本発明法 あり なし 24／5000 0.48 [Table 2] Number of adhesion samples during annealing of ceramics Use of alumina powder with defective rate coating film (pieces) (%) Comparative example None None 3850/5000 77 Conventional method None Yes 22/5000 0.44 Method of the present invention None None 24/5000 0.48
【００２０】[0020]
【表３】 セラミックス 焼鈍時の 密着サンプル数 不良率 コーティング膜 アルミナ粉使用 （個） （％） 比較例 なし なし 1430／3000 47.7 従来法 なし あり 8／3000 0.26 本発明法 あり なし 7／3000 0.23[Table 3] Number of adhesion samples during annealing of ceramics Rejection rate Coating film Alumina powder used (pieces) (%) Comparative example None None 1430/3000 47.7 Conventional method None Available 8/3000 0.26 Invented method Available None 7/3000 0.23
フロントページの続き (72)発明者 田中 英敏 大阪府堺市石津西町５番地 日新製鋼株 式会社 鉄鋼研究所内 (56)参考文献 特開 平３−202423（ＪＰ，Ａ) 特開 平３−202419（ＪＰ，Ａ) 特開 昭60−258477（ＪＰ，Ａ) 特開 昭60−262978（ＪＰ，Ａ) 特公 昭45−5124（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 22/00 - 22/86 C21D 9/46 501 Continuation of the front page (72) Inventor Hidetoshi Tanaka 5 Ishizu Nishimachi, Sakai City, Osaka Prefecture Inside of the Steel Research Laboratory, Nisshin Steel Corporation (56) References JP-A-3-202423 (JP, A) JP-A-3-202419 (JP, A) JP-A-60-258477 (JP, A) JP-A-60-262978 (JP, A) JP-B-45-5124 (JP, B1) (58) Fields investigated (Int. Cl. 7) , DB name) C23C 22/00-22/86 C21D 9/46 501
Claims (1)
磁性合金の表面に厚さ５０オングストローム以上のアル
ミナ、シリカ、チタニアあるいはジルコニアのうち１種
以上を含むセラミック皮膜を有することを特徴とする磁
性合金鋼帯。 【０００１】1. A Fe—Ni-based or Fe—Ni—Cr-based soft magnetic alloy having a ceramic coating having a thickness of 50 Å or more and containing at least one of alumina, silica, titania and zirconia on a surface thereof. Magnetic alloy steel strip. [0001]
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08726391A JP3160003B2 (en) | 1991-03-28 | 1991-03-28 | Magnetic alloy steel strip without adhesion in magnetic annealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08726391A JP3160003B2 (en) | 1991-03-28 | 1991-03-28 | Magnetic alloy steel strip without adhesion in magnetic annealing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04301079A JPH04301079A (en) | 1992-10-23 |
| JP3160003B2 true JP3160003B2 (en) | 2001-04-23 |
Family
ID=13909888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08726391A Expired - Fee Related JP3160003B2 (en) | 1991-03-28 | 1991-03-28 | Magnetic alloy steel strip without adhesion in magnetic annealing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3160003B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9217187B2 (en) * | 2012-07-20 | 2015-12-22 | Ut-Battelle, Llc | Magnetic field annealing for improved creep resistance |
| CN108531956A (en) * | 2018-06-26 | 2018-09-14 | 湖州同光金属材料有限公司 | A kind of metal product and preparation method thereof with wearing layer |
-
1991
- 1991-03-28 JP JP08726391A patent/JP3160003B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04301079A (en) | 1992-10-23 |
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