JPH04131639U - blast furnace tuyere - Google Patents
blast furnace tuyereInfo
- Publication number
- JPH04131639U JPH04131639U JP4841891U JP4841891U JPH04131639U JP H04131639 U JPH04131639 U JP H04131639U JP 4841891 U JP4841891 U JP 4841891U JP 4841891 U JP4841891 U JP 4841891U JP H04131639 U JPH04131639 U JP H04131639U
- Authority
- JP
- Japan
- Prior art keywords
- blast furnace
- alloy
- wear
- furnace tuyere
- grooves
- 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.)
- Granted
Links
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 49
- 239000000956 alloy Substances 0.000 claims abstract description 49
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052802 copper Inorganic materials 0.000 claims abstract description 16
- 239000010949 copper Substances 0.000 claims abstract description 16
- 230000035939 shock Effects 0.000 abstract description 3
- 229910018487 Ni—Cr Inorganic materials 0.000 description 19
- 239000000463 material Substances 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 229910003296 Ni-Mo Inorganic materials 0.000 description 5
- DDTIGTPWGISMKL-UHFFFAOYSA-N molybdenum nickel Chemical compound [Ni].[Mo] DDTIGTPWGISMKL-UHFFFAOYSA-N 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Blast Furnaces (AREA)
Abstract
(57)【要約】
【目的】 繰り返し熱衝撃及び物理的衝撃を受ける高炉
羽口の寿命を伸ばし、突発事故を防止する。
【構成】 内部を水冷した銅製の高炉羽口１０の少なく
とも先部表面に多数の溝１１を、該溝１１の幅と略同等
かあるいは該溝の幅より狭い間隔で形成し、該溝１１内
に耐摩耗性合金１２を充填溶接した。
(57) [Summary] [Purpose] To extend the life of the blast furnace tuyere, which is subjected to repeated thermal shock and physical shock, and to prevent sudden accidents. [Structure] A large number of grooves 11 are formed on at least the surface of the tip of a copper blast furnace tuyere 10 whose interior is water-cooled, at intervals approximately equal to or narrower than the width of the grooves 11, and Wear-resistant alloy 12 was filled and welded to the surface.
Description
【０００１】0001
本考案は、耐久性、耐摩耗性を向上させる為に行う高炉羽口に関する。 The present invention relates to a blast furnace tuyere for improving durability and wear resistance.
【０００２】0002
溶鉱炉の熱風吹き込みに使用される高炉羽口は、一般に銅を母材とし、内部に は冷却水を供給して水冷式となっているが、炉内に突き出た羽口の先端が、炉内 の溶銑、溶滓、炉内装入物に接触する等の過酷な環境下にある。従って、該溶銑 等の接触によって高炉羽口が溶損し易く、これによって羽口冷却水の漏れに基づ く爆発事故が発生したりするので、従来からＮｉ基自溶性合金の肉盛を施す手段 が多く採用されてきた。 Blast furnace tuyeres, which are used to blow hot air into blast furnaces, generally have copper as a base material and have internal is water-cooled by supplying cooling water, but the tip of the tuyere that protrudes into the furnace is under harsh environments such as contact with hot metal, slag, and furnace contents. Therefore, the hot metal The blast furnace tuyeres are prone to melting due to contact with Conventionally, the method of overlaying with Ni-based self-fluxing alloys has been used to prevent explosion accidents. have been widely adopted.
【０００３】0003
しかしながら、前記Ｎｉ基自溶性合金によって肉盛した高炉羽口において、該 溶銑、溶滓のアタックの他、炉内装入物による機械的摩耗も加わって耐用寿命が 短いという問題点があった。 また、一方において、特開昭５３−１３８９０５号に示すように、高炉羽口の 銅母材表面を、自溶性合金層、サーメット層、セラミック層で順次被覆すること によって耐熱衝撃性及び、高温耐摩耗性を向上させた高炉羽口も提案されている が、比較的コストが高くなり、使用中に剥離が生じ大きな効果が得られていない というのが現状である。 そこで、本考案者はＮｉ−Ｃｒ合金またはＮｉ−Ｍｏ合金を表面に肉盛溶接し て、高炉羽口の表面に硬化層を形成し、寿命の延長を図ることを種々実験したが 、耐摩耗性のある金属は通常熱伝導率が悪いので、溶滓、溶銑等の接触によって 表面の温度が急激に上昇し、これによって繰り返し熱応力がかかると耐摩耗性金 属層が徐々に剥離するということが分かった。 本考案はかかる事情に鑑みてなされたもので、過酷の条件の下にも従来より比 較的長期の寿命が得られる高炉羽口を提供することを目的とする。 However, in the blast furnace tuyere overlaid with the Ni-based self-fluxing alloy, the In addition to the attack of hot metal and slag, mechanical wear caused by the contents inside the furnace also reduces the service life. The problem was that it was short. On the other hand, as shown in JP-A-53-138905, blast furnace tuyere Coating the copper base material surface with a self-fusing alloy layer, a cermet layer, and a ceramic layer in sequence. Blast furnace tuyeres with improved thermal shock resistance and high-temperature wear resistance have also been proposed by However, the cost is relatively high and peeling occurs during use, making it ineffective. That is the current situation. Therefore, the present inventor overlay-welded Ni-Cr alloy or Ni-Mo alloy on the surface. We have conducted various experiments to extend the life of blast furnace tuyere by forming a hardened layer on its surface. , wear-resistant metals usually have poor thermal conductivity, so contact with molten slag, hot metal, etc. When the temperature of the surface increases rapidly and this causes repeated thermal stress, wear-resistant gold It was found that the genus layer gradually peeled off. The present invention was developed in view of the above circumstances, and it can be used even under harsh conditions compared to conventional methods. The purpose of the present invention is to provide a blast furnace tuyere that has a relatively long service life.
【０００４】0004
前記目的に沿う請求項第１項記載の高炉羽口は、内部を水冷した銅製の高炉羽 口の少なくとも先部表面に多数の溝を、該溝の幅と略同等かあるいは該溝の幅よ り狭い間隔で形成し、該溝内に耐摩耗性合金を充填溶接して構成されている。 ここで、溝の幅は溝深さの１〜３倍程度が好ましく、余り広いと溝側面からの 熱伝導が悪く、狭いと溶接が行い難い。また、耐摩耗性合金としては、例えば７ ３％Ｎｉ、１９％Ｃｒ、３％Ｍｎを有するＮｉ−Ｃｒ合金、４５％Ｎｉ、３２％ Ｍｏ、１６％Ｃｒ、３％Ｓｉを有するＮｉ−Ｍｏ合金があるが、他の肉盛溶接可 能な耐摩耗性合金であっても良い。 The blast furnace tuyere according to claim 1 which meets the above object is a blast furnace tuyere made of copper whose interior is water-cooled. A large number of grooves are formed on at least the tip surface of the mouth, and the width is approximately equal to or greater than the width of the grooves. The grooves are formed at narrow intervals, and a wear-resistant alloy is filled and welded into the grooves. Here, the width of the groove is preferably about 1 to 3 times the groove depth, and if it is too wide, it will cause damage from the side of the groove. Heat conduction is poor and it is difficult to weld if the space is narrow. In addition, as a wear-resistant alloy, for example, 7 Ni-Cr alloy with 3% Ni, 19% Cr, 3% Mn, 45% Ni, 32% There is a Ni-Mo alloy with Mo, 16% Cr, and 3% Si, but other overlay welding is possible. It may also be a wear-resistant alloy with high wear resistance.
【０００５】[0005]
請求項第１項記載の高炉羽口においては、高炉羽口の少なくとも先部表面に多 数の溝を、該溝の幅と略同等かあるいは該溝の幅より狭い間隔で形成し、該溝内 に耐摩耗性合金を充填溶接しているので、この耐摩耗性合金によって補強される ことになる。この場合、耐摩耗性合金は底面の銅母材から冷却されるのみでなく 、溝側面からも冷却される。従って、耐摩耗性合金の温度が表面中心であっても 、温度上昇が抑制される。そして、銅からなる溝壁面に近い側は更に温度上昇が 抑制され、これによって該耐摩耗性合金の熱応力が緩和される。更には、該耐摩 耗性合金は溝内に嵌入して溝壁の銅にも溶接されているので、付着力が向上し、 該耐摩耗性合金の剥離が抑制される。 なお、これによって施工された高炉表面には縞状に銅母材が露出していること にはなり、溶滓、溶銑等からの熱応力あるいは機械的衝撃によって摩耗するが、 この摩耗作用は側部に縞状に配置された耐摩耗性合金によって緩和され、これに よって、全体として従来の高炉羽口より長期の寿命を得ることができる。 In the blast furnace tuyere according to claim 1, at least the tip surface of the blast furnace tuyere is provided with a multilayer structure. A number of grooves are formed at intervals approximately equal to or narrower than the width of the groove, and Welded and filled with a wear-resistant alloy, it is reinforced by this wear-resistant alloy. It turns out. In this case, the wear-resistant alloy is not only cooled from the bottom copper matrix but also , it is also cooled from the side surfaces of the groove. Therefore, even if the temperature of the wear-resistant alloy is centered on the surface, , temperature rise is suppressed. The temperature rises further on the side closer to the copper groove wall. thermal stresses in the wear-resistant alloy. Furthermore, the wear resistance The wearable alloy fits into the groove and is also welded to the copper on the groove wall, improving adhesion. Peeling of the wear-resistant alloy is suppressed. In addition, the copper base material is exposed in stripes on the blast furnace surface constructed by this method. It wears out due to thermal stress or mechanical impact from molten slag, hot metal, etc. This abrasive effect is mitigated by wear-resistant alloy stripes on the sides. Therefore, as a whole, a longer life can be obtained than the conventional blast furnace tuyeres.
【０００６】[0006]
続いて、本考案を具体化した一実施例について説明し、本考案の理解に供する 。 まず、図１（Ａ）に示すように銅からなる高炉羽口１０の表面に、溝１１を形 成し、該溝１１内に成分が耐摩耗性合金の一例である７３％Ｎｉ、１９％Ｃｒ、 ３％Ｍｎを有するＮｉ−Ｃｒ合金１２を肉盛溶接した。これによってＮｉ−Ｃｒ 合金１２は溝１１の底面だけでなく周囲の壁面にも固着されるので、銅母材１３ に強固に溶接されることになる。そして、溝１１に溶接されたＮｉ−Ｃｒ合金１ ２は溝底面から冷却されるだけでなく、溝壁面からも冷却されるので、図１（Ｂ ）に示すように、銅母材１３に均一にＮｉ−Ｃｒ合金層１４が肉盛溶接された場 合より更に冷却効果が優れることになる。 Next, an example embodying the present invention will be explained to provide an understanding of the present invention. . First, as shown in Fig. 1(A), grooves 11 are formed on the surface of the blast furnace tuyere 10 made of copper. The groove 11 contains 73% Ni, 19% Cr, which is an example of a wear-resistant alloy. Ni-Cr alloy 12 containing 3% Mn was overlay welded. As a result, Ni-Cr Since the alloy 12 is fixed not only to the bottom surface of the groove 11 but also to the surrounding wall surface, the copper base material 13 It will be firmly welded to the Then, the Ni-Cr alloy 1 welded to the groove 11 2 is cooled not only from the bottom of the groove but also from the wall of the groove. ), when the Ni-Cr alloy layer 14 is uniformly overlay welded on the copper base material 13, The cooling effect will be even better than if the
【０００７】 そこで、この冷却の状況、即ちＮｉ−Ｃｒ合金の表面温度を、図２に示すよう に、その幅（ｗ）、深さ（ｄ）、溝間距離（ｐ）、溝底厚み（ｓ）を種々変えて 、Ｎｉ−Ｃｒ合金１２の表面中央温度（Ｔc ) と、該Ｎｉ−Ｃｒ合金１２の表面 端部温度（Ｔe ) と、Ｎｉ−Ｃｒ合金１２と銅母材１３との接合中央温度（Ｔｓ ）を近似計算によって算出した。この結果を表1 に示す。 なお、計算に当たっては、炉内温度＝１６００℃、冷却水温度＝３０℃、羽口 への熱伝達率＝７００kcal／ｍｈｒ℃、Ｎｉ−Ｃｒ合金の熱伝動率＝１１kcal／ ｍｈr ℃、冷却水流速＝１２ｍ／sec 、管路相当直径＝０．０１７ｍとした。 そして、比較の為に図２（Ｂ）に示すように、均一にＮｉ−Ｃｒ合金層１４を 肉盛溶接した場合の表面温度も合わせて記載する。[0007] Therefore, this cooling situation, that is, the surface temperature of the Ni-Cr alloy, is as shown in Figure 2. The width (w), depth (d), distance between grooves (p), and groove bottom thickness (s) were varied. , the surface center temperature (Tc) of the Ni-Cr alloy 12, and the surface center temperature (Tc) of the Ni-Cr alloy 12. The end temperature (Te) and the joining center temperature (Ts) between the Ni-Cr alloy 12 and the copper base material 13 ) was calculated by approximate calculation. The results are shown in Table 1. In addition, for calculation, furnace temperature = 1600℃, cooling water temperature = 30℃, tuyere Heat transfer coefficient to = 700 kcal/mhr℃, heat transfer coefficient of Ni-Cr alloy = 11 kcal/ mhr °C, cooling water flow rate = 12 m/sec, and pipe equivalent diameter = 0.017 m. For comparison, as shown in FIG. 2(B), the Ni-Cr alloy layer 14 is uniformly formed. Also record the surface temperature when overlay welding.
【０００８】[0008]
【表１】 [Table 1]
【０００９】 表１からも明らかなように、高炉羽口１０に溝１１を形成し、該溝１１内にＮ ｉ−Ｃｒ合金１２を肉盛溶接をした場合には、Ｎｉ−Ｃｒ合金１２の温度が均一 に肉盛溶接した場合より下がることになり、これによって、熱膨張も緩和され、 継続使用によるＮｉ−Ｃｒ合金の剥離が減少し長期の寿命を得ることになる。 そして、溝１１以外の高炉羽口１０の表面は銅母材からなるので、その部分の みを見れば硬度は大きくなく、耐摩耗性に欠けるが、側部のＮｉ−Ｃｒ合金がこ の弱い部分を補強するので、全体として長期の寿命を得ることができる。[0009] As is clear from Table 1, a groove 11 is formed in the blast furnace tuyere 10, and N When overlaying the i-Cr alloy 12, the temperature of the Ni-Cr alloy 12 is uniform. This will reduce the thermal expansion compared to when overlay welding. Peeling of the Ni-Cr alloy due to continued use is reduced, resulting in a long service life. Since the surface of the blast furnace tuyere 10 other than the groove 11 is made of copper base material, that part If you look at it, the hardness is not large and it lacks wear resistance, but the Ni-Cr alloy on the side is By reinforcing the weak parts of the product, you can obtain a long service life as a whole.
【００１０】 前記実施例においては、耐摩耗性合金としてＮｉ−Ｃｒ合金を使用したが、耐 摩耗性合金として４５％Ｎｉ、３２％Ｍｏ、１６％Ｃｒ、３％Ｓｉを有するＮｉ −Ｍｏ合金を使用することも可能である。このＮｉ−Ｍｏ合金の平均硬度はＨｖ ４９０程度であり、ＷＣ−Ｎｉ合金より劣るが、マトリックス内に散在する金属 間化合物はＨｖ１１００程度であるので、充分な耐摩耗性を有する。 前記高炉羽口１３の場合には銅からなる高炉羽口に直接Ｎｉ−Ｃｒ合金または Ｎｉ−Ｍｏ合金を略３ｍｍ〜６ｍｍの厚みで肉盛溶接したが、予め施工し易いＮ ｉ−Ｃｒ合金を下盛した後、その表面にＮｉ−Ｍｏ合金を上盛することも可能で ある。 そして、前記実施例においては、前記隣合う溝の距離は溝の幅と略同様に構成 したが、隣合う溝の距離は溝の幅より小さい方（１〜１／４程度まで）が好まし く、これによって、耐摩耗性合金の表面積が増加するので、耐摩耗性が更に向上 する。また、耐摩耗性合金の厚みも３〜４ｍｍ以下の方が好ましいことが分かる 。 更には、前記実施例は該耐摩耗性合金の溶接をＴＩＧ溶接によって行ったが、 ＭＩＧ溶接であっても良く、また前記実施例は高炉羽口の先部のみに本考案を適 用したが、高炉羽口の中間部も合わせてあるいは高炉羽口の全体に所定の溝を形 成し該溝内を耐摩耗性合金によって充填溶接する場合も本考案は適用される。0010 In the above examples, Ni-Cr alloy was used as the wear-resistant alloy, but Ni with 45% Ni, 32% Mo, 16% Cr, 3% Si as wear alloy It is also possible to use -Mo alloys. The average hardness of this Ni-Mo alloy is Hv 490, which is inferior to the WC-Ni alloy, but the metal scattered within the matrix Since the intermediate compound has a Hv of about 1100, it has sufficient wear resistance. In the case of the blast furnace tuyeres 13, Ni-Cr alloy or Ni-Mo alloy was overlay welded to a thickness of approximately 3 mm to 6 mm, but N After underlaying the i-Cr alloy, it is also possible to overlay the Ni-Mo alloy on the surface. be. In the embodiment, the distance between the adjacent grooves is configured to be substantially the same as the width of the grooves. However, it is preferable that the distance between adjacent grooves be smaller than the width of the grooves (up to about 1 to 1/4). This increases the surface area of the wear-resistant alloy, further improving its wear resistance. do. It is also found that the thickness of the wear-resistant alloy is preferably 3 to 4 mm or less. . Furthermore, in the above examples, the wear-resistant alloy was welded by TIG welding, MIG welding may also be used, and the embodiment described above applies the present invention only to the tip of the blast furnace tuyere. However, a predetermined groove is also formed in the middle part of the blast furnace tuyere or in the entire blast furnace tuyere. The present invention is also applicable to the case where the inside of the groove is filled with a wear-resistant alloy and welded.
【００１１】[0011]
請求項第１項記載の高炉羽口は、以上の説明からも明らかなように、高炉羽口 の少なくとも先部表面に多数の溝を、該溝の幅と略同等かあるいは該溝の幅より 狭い間隔で形成し、該溝内に耐摩耗性合金を充填溶接しているので、耐摩耗性合 金が周囲の銅母材によって冷却されて熱応力が発生しにくく、しかも溝底及び溝 壁にも耐摩耗性合金が溶接されているので、繰り返し使用による剥離が減少し、 長期の寿命を得ることができる。 As is clear from the above description, the blast furnace tuyere according to claim 1 is a blast furnace tuyere. a large number of grooves on at least the tip surface of the groove, the width being approximately equal to or greater than the width of the groove. Since the grooves are formed at narrow intervals and a wear-resistant alloy is filled and welded into the grooves, the wear-resistant properties are improved. Since the gold is cooled by the surrounding copper base metal, thermal stress is less likely to occur, and the groove bottom and groove The walls are also welded with a wear-resistant alloy, which reduces peeling due to repeated use. A long service life can be obtained.
【図１】高炉羽口を示した部分断面図である。FIG. 1 is a partial cross-sectional view showing a blast furnace tuyere.
【図２】同拡大断面図である。FIG. 2 is an enlarged sectional view of the same.
１０ 高炉 １１ 溝 １２ Ｎｉ−Ｃｒ合金 １３ 銅母材 １４ Ｎｉ−Ｃｒ合金 10 Blast furnace 11 Groove 12 Ni-Cr alloy 13 Copper base material 14 Ni-Cr alloy
───────────────────────────────────────────────────── フロントページの続き (72)考案者 武田 碩生 福岡県北九州市小倉南区新曽根８番21号 株式会社戸畑製作所内 ──────────────────────────────────────────────── ─── Continuation of front page (72) Inventor: Takeda Sekio 8-21 Shinsone, Kokuraminami Ward, Kitakyushu City, Fukuoka Prefecture Inside Tobata Manufacturing Co., Ltd.
Claims (1)
とも先部表面に多数の溝を、該溝の幅と略同等かあるい
は該溝の幅より狭い間隔で形成し、該溝内に耐摩耗性合
金を充填溶接したことを特徴とする高炉羽口。Claim 1: A large number of grooves are formed in at least the surface of the tip of a copper blast furnace tuyere whose interior is water-cooled, at intervals approximately equal to or narrower than the width of the grooves; A blast furnace tuyere characterized by being filled and welded with an abrasive alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4841891U JP2527229Y2 (en) | 1991-05-28 | 1991-05-28 | Blast furnace tuyere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4841891U JP2527229Y2 (en) | 1991-05-28 | 1991-05-28 | Blast furnace tuyere |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04131639U true JPH04131639U (en) | 1992-12-03 |
| JP2527229Y2 JP2527229Y2 (en) | 1997-02-26 |
Family
ID=31926957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4841891U Expired - Lifetime JP2527229Y2 (en) | 1991-05-28 | 1991-05-28 | Blast furnace tuyere |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2527229Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19903865C2 (en) * | 1998-01-30 | 2002-06-06 | Kobe Steel Ltd | Windform for a blast furnace |
| KR101368431B1 (en) * | 2012-09-07 | 2014-02-28 | 주식회사 포스코 | A tuyere for a melting furnace |
-
1991
- 1991-05-28 JP JP4841891U patent/JP2527229Y2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19903865C2 (en) * | 1998-01-30 | 2002-06-06 | Kobe Steel Ltd | Windform for a blast furnace |
| KR101368431B1 (en) * | 2012-09-07 | 2014-02-28 | 주식회사 포스코 | A tuyere for a melting furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2527229Y2 (en) | 1997-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960806 |