JP2000297308A - Stave cooler - Google Patents
Stave coolerInfo
- Publication number
- JP2000297308A JP2000297308A JP11103656A JP10365699A JP2000297308A JP 2000297308 A JP2000297308 A JP 2000297308A JP 11103656 A JP11103656 A JP 11103656A JP 10365699 A JP10365699 A JP 10365699A JP 2000297308 A JP2000297308 A JP 2000297308A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- ceramic material
- cooler
- composite material
- stave
- 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.)
- Withdrawn
Links
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- Blast Furnaces (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は高炉等の冶金炉にお
いて、炉体の炉壁を保護し、炉体寿命の延長のために炉
壁を強制冷却する場合に用いられるステーブ(熱交換
体)に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stave (heat exchanger) used in a metallurgical furnace such as a blast furnace for protecting the furnace wall of a furnace body and forcibly cooling the furnace wall to extend the life of the furnace body. It is about.
【0002】[0002]
【従来の技術】従来高炉等においては、炉体の保護、炉
体寿命延長のため炉壁の強制冷却を行っている。このよ
うな冷却手段としては、多くの発明が開示されており
(例えば特開昭61−37904、特開平6−3224
19などの公報)、また文献としても「鉄と鋼 第78
年(1992)第7号論文 高炉プロフィルを長期安定
化させる炉壁煉瓦一体型ステーブの開発」にあるよう
に、採用当初のステーブから現在に到るまでのステーブ
の変遷について詳しく紹介された論文があり、高炉での
炉壁冷却ではステーブ冷却方式が本流となっている。2. Description of the Related Art In a blast furnace and the like, forcible cooling of a furnace wall is performed to protect the furnace body and extend the life of the furnace body. Many inventions have been disclosed as such cooling means (for example, Japanese Patent Application Laid-Open Nos. 61-37904 and 6-3224).
No. 19, etc.), and as a document, "Iron and Steel No. 78
7 (1992), Development of a stove with a built-in furnace wall that stabilizes the blast furnace profile for a long period of time ”, a paper that introduced in detail the transition of staves from the initial stave to the present. Yes, the stave cooling method is the mainstream for furnace wall cooling in blast furnaces.
【0003】従来のステーブ冷却方式は図2に示すよう
に、ステーブ本体を形成する鋳物4内部に鋳込み煉瓦3
と冷却パイプ5を鋳込んだステーブクーラーを、炉壁F
の外面の鉄皮6と炉内側の耐火物1との間に設置し、鉄
皮に取付けボルト7にて固定する構造を採っている。In the conventional stave cooling method, as shown in FIG. 2, a casting brick 3 is formed inside a casting 4 forming a stave body.
The stove cooler in which the cooling pipe 5 is cast
Is installed between the steel shell 6 on the outer surface and the refractory 1 inside the furnace, and is fixed to the steel shell with mounting bolts 7.
【0004】また、上記ステーブクーラーの他に特開平
6−330116号公報が提案されている。該公報の記
載によれば、耐火セラミック材料と鋳鉄、鋳鋼等の金属
材との複合材料からなる炉内側パネルと金属材料からな
る冷却側パネルとを備えたステーブクーラーであって、
該内側パネルは一方の面から他方の面にかけて複合材料
の組成割合が連続的に傾斜し、かつ、冷却パネル中に冷
却パイプを有する傾斜機能を備えたステーブクーラーで
ある。しかして該ステーブの複合材料組成割合を連続的
に傾斜するような機能を付与したところに大きな特徴を
有し、その目的とする所は高炉炉壁に設置して使用した
場合ステーブクーラーの肉厚方向(炉内面側から炉外面
鉄皮側)において、温度勾配の変化を緩やかにし、加熱
・冷却の変動があっても発生熱応力が大幅に軽減されて
熱応力緩和機能が達成され、ステーブクーラーのクラッ
ク発生が抑制されることを狙いとしている。また、ステ
ーブクーラー鋳造時の熱衝撃による煉瓦割れを防止し、
複合材料部の金属材料として従来の鋳鉄から鋳鋼に変更
しステーブを強化することも狙いとしている。In addition to the above stove cooler, Japanese Patent Application Laid-Open No. Hei 6-330116 has been proposed. According to the description of the publication, a stave cooler provided with a furnace inner panel made of a composite material of a refractory ceramic material and a metal material such as cast iron and cast steel and a cooling side panel made of a metal material,
The inner panel is a stave cooler having a gradient function in which the composition ratio of the composite material is continuously inclined from one surface to the other surface, and has a cooling pipe in the cooling panel. It has a great feature in that a function of continuously inclining the composite material composition ratio of the stave is provided. The purpose of the stave is to set the thickness of the stave cooler when the stave cooler is used when installed on a blast furnace wall. In the direction (from the furnace inner surface to the furnace outer surface steel side), the temperature gradient is moderately changed, and even if there are fluctuations in heating and cooling, the generated thermal stress is greatly reduced, and the thermal stress relaxation function is achieved. It is aimed at suppressing the occurrence of cracks. In addition, we prevent brick breakage by thermal shock at the time of casting stave cooler,
It is also aiming to change the conventional cast iron to cast steel as the metal material of the composite material part and strengthen the stave.
【0005】[0005]
【発明が解決しようとする課題】しかし、上記図2に示
したステーブクーラーによる冷却方法では下記の問題点
を有している。第一に、炉内側の耐火物と冷却用パイプ
を鋳込んだステーブクーラーがそれぞれ独立壁として構
築されている場合は、スタンプ材2を介して炉内側耐火
物1を配設せざるを得ず、耐火物1の構造安定性が悪く
なり、部分脱落または全面脱落が炉の稼動早期に起こる
ケースがあり、耐火物の寿命が著しく短くなる欠点を有
していた。However, the cooling method using the stave cooler shown in FIG. 2 has the following problems. First, when the refractory inside the furnace and the stave cooler in which the cooling pipe is cast are constructed as independent walls, the refractory inside the furnace 1 must be disposed via the stamp material 2. In addition, the structural stability of the refractory 1 is deteriorated, and in some cases, partial or total dropout occurs at the early stage of operation of the furnace, which has a drawback that the life of the refractory is significantly shortened.
【0006】第二に、前記耐火物を部分的に鋳物で保持
した構造、あるいは耐火物全部を鋳ぐるみした構造(耐
火物を一体鋳造した構造)であったが、鋳物で耐火物を
支持するにはその構造上弱く耐火物が抜け落ちることも
あり、前記独立壁構造より耐火物の寿命につてはは多少
は長くなるが限界があった。Second, the refractory has a structure in which the refractory is partially held by a casting or a structure in which the entire refractory is cast-in (a structure in which the refractory is integrally cast), but the refractory is supported by the casting. In some cases, the refractory falls off due to its structure, and the life of the refractory is somewhat longer than that of the independent wall structure, but there is a limit.
【0007】第三に、炉内側の耐火物の脱落が起こる
と、炉内プロフィールに急激な変化が生じ、炉内の装入
物の降下に悪影響を及ぼすことになる。更にまたステー
ブクーラーは鋳物であり耐火物より熱伝導率が高く、炉
内側の耐火物の脱落によりステーブクーラーが炉内に露
出すると、炉の部位によっては炉内側のガスと装入物に
作用してそれらが過冷却を起こすことがあり、特に反応
炉である高炉等の操業上においては好ましくない事態を
生じる惧れがあった。Third, when the refractory inside the furnace falls off, a sharp change in the furnace profile occurs, which adversely affects the fall of the charge in the furnace. Furthermore, the stove cooler is a casting and has a higher thermal conductivity than the refractory, and when the stove cooler is exposed inside the furnace due to the fallout of the refractory inside the furnace, it acts on the gas and the charge inside the furnace depending on the part of the furnace. Therefore, they may be supercooled, which may cause an undesirable situation particularly in the operation of a blast furnace as a reaction furnace.
【0008】また、前記した特開平6−330116号
公報に記載されたステーブクーラーでは、複合材料によ
る傾斜機能によりクラックの発生の抑制はそれなりに可
能ではあるが、複合材料からなる炉内側パネルと金属材
料からなる冷却側パネルの密着性がボルト状支持具のた
め弱く、長期稼動に対してはそれほど大きな効果を有し
てはいない。さらに、その製造に際し金属スケルトンに
セラミック材料を溶浸させるためには微妙な温度制御が
必要で、更にステーブとして鋳造するには炉内側と炉外
側パネルに分割した工程が必要で製造方法が複雑であ
る。Further, in the stove cooler described in the above-mentioned Japanese Patent Laid-Open Publication No. Hei 6-330116, the generation of cracks can be suppressed by the tilting function of the composite material. The adhesiveness of the cooling side panel made of the material is weak due to the bolt-shaped support, and does not have a great effect on long-term operation. Furthermore, in order to infiltrate the metal skeleton with the ceramic material during the production, delicate temperature control is required, and in order to cast as a stave, a process of dividing the furnace inside and outside the furnace is required, making the production method complicated. is there.
【0009】そこで本発明は、冶金炉用ステーブクーラ
ーにおける従来の欠点、すなわち炉内側耐火物の脱落に
よって起こるプロフィルの急激な変化、炉内側過冷却の
問題点を有利に解決できる、かつ一体で密着性を強化し
た製造の容易な複合材料を使用したステーブクーラーを
提供するものである。Accordingly, the present invention can advantageously solve the conventional disadvantages of the stove cooler for metallurgical furnaces, namely, the rapid change in the profile caused by the fallout of the refractory inside the furnace and the problem of the supercooling inside the furnace, and the integral close contact. An object of the present invention is to provide a stave cooler using a composite material which is easily manufactured and has enhanced properties.
【0010】[0010]
【課題を解決するための手段】本発明は前記した従来方
法における問題点を解決するためになされたものであっ
て、その要旨するところは、下記手段にある。 (1) 高炉等の冶金炉のステーブクーラーにおいて、
炉内側がセラミック材料と鋳鉄等の金属材料との複合材
料からなり、かつ該複合材料は全域に渡りほぼ均等なる
容積比を有すると共に、炉外側が鋳鉄等の金属材料中に
冷却水を通す冷却管を複数配置して一体的に鋳造したス
テーブクーラー。 (2) 前記ステーブクーラーの複合材料部を形成する
に当たり、セラミック材料のスケルトンに金属材料を鋳
込んだものである(1)記載のステーブクーラー。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the conventional method, and its gist lies in the following means. (1) In a stave cooler of a metallurgical furnace such as a blast furnace,
The inside of the furnace is made of a composite material of a ceramic material and a metal material such as cast iron, and the composite material has a substantially equal volume ratio over the entire area, and the outside of the furnace is cooled by passing cooling water through the metal material such as cast iron. A stave cooler in which multiple tubes are arranged and cast integrally. (2) The stave cooler according to (1), wherein a metal material is cast into a skeleton of a ceramic material when forming the composite material portion of the stave cooler.
【0011】(3) 前記(1)または(2)におい
て、セラミック材料の容積比(セラミック材料/全容
積)が0.1超から0.5であるステーブクーラー。 (4) 前記(1)または(2)において、複合材料の
厚さが20から120mmであるステーブクーラー。 (5) 前記(3)と(4)を同時に満たしたステーブ
クーラー。 (6) 前記ステーブクーラーの複合材料部を形成する
セラミック材として、Al2 O3 質、ZrO2 質、また
はSiC質を主体としたものを用いた(1)ないし
(5)のいずれかに記載のステーブクーラー。(3) The stove cooler according to (1) or (2), wherein the volume ratio of the ceramic material (ceramic material / total volume) is more than 0.1 to 0.5. (4) The stove cooler according to (1) or (2), wherein the thickness of the composite material is 20 to 120 mm. (5) A stove cooler that satisfies the conditions (3) and (4) at the same time. (6) The stave cooler according to any one of (1) to (5), wherein a ceramic material mainly forming Al2 O3, ZrO2, or SiC is used as a ceramic material forming a composite material portion of the stave cooler. .
【0012】[0012]
【発明の実施の形態】本発明のステーブクーラーにおい
ては、従来の炉内側の耐火物及び鋳込み煉瓦を配設しな
い代りに、該ステーブクーラーの炉内側にはセラミック
材料と鋳鉄等の金属材料との複合材料で構成され、その
複合材料はセラミック材料と金属材料の容積比が全域に
わたってほぼ均等な容積比を有し、炉外側の金属材料等
と一体的に鋳造することにより全体を構成しており、上
述した耐火物の脱落によるプロフィルの急激な変化を防
止したものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS In a stave cooler according to the present invention, instead of disposing a refractory and a cast brick inside the furnace, a ceramic material and a metal material such as cast iron are provided inside the furnace of the stave cooler. It is composed of a composite material, and the volume ratio of the ceramic material to the metal material has a substantially uniform volume ratio over the entire area, and the composite material is integrally formed by casting integrally with the metal material on the outside of the furnace. This prevents a sudden change in the profile due to the refractory falling off.
【0013】また、この複合材料はステーブクーラーの
炉内側と冷却パイプ間の断熱材としての機能を有するの
で、炉内側過冷却の問題を解消し、かつ炉外側部分の冷
却を促進しステーブクーラーの損耗速度も緩やかとな
り、ステーブの長寿命化、即ち炉の寿命延長を可能とす
るものである。Further, since this composite material has a function as a heat insulating material between the inside of the furnace of the stave cooler and the cooling pipe, it solves the problem of supercooling inside the furnace and promotes the cooling of the outside of the furnace to promote the cooling of the stave cooler. The wear rate is also reduced, and the life of the stave can be extended, that is, the life of the furnace can be extended.
【0014】セラミック材料はスポンジ状、または板状
のスケルトンで構成されたものに金属材料を鋳込んで複
合材料を構成するのが良く、ステーブクーラー本体の金
属材料との馴染みがよく、セラミック材料のスケルトン
の細かい空隙部まで溶融金属が侵入し両者の合体を確実
なものとなす。The ceramic material is preferably composed of a sponge-shaped or plate-shaped skeleton, and a metal material is cast into the composite material to form a composite material. The ceramic material has good compatibility with the metal material of the stave cooler body. The molten metal penetrates into the fine gaps of the skeleton, and the union of the two is ensured.
【0015】また、本発明者らの多くの実験結果によれ
ば、炉内面側に位置せしめる複合材料は、セラミック材
料が容積で10超え50%を占め、金属材料が50から
90未満%を占めたものが金属本体との密着性がよく、
セラミック材料の剥離もなく極めて良好な成績を得るこ
とができた。また同時に複合材料の厚さは20から12
0mm程度がよく、120mmを超えた厚さにすると金
属本体側の肉厚が薄くなり、ステーブクーラーの寿命が
短くなる惧れがある。また20mm未満であると、セラ
ミックを存在させる意義が薄れ、その効果を得ることが
できない。According to many experimental results of the present inventors, in the composite material located on the inner surface side of the furnace, the ceramic material occupies more than 10 and 50% by volume, and the metal material occupies 50 to less than 90% by volume. Is good adhesion to the metal body,
Very good results could be obtained without peeling of the ceramic material. At the same time, the thickness of the composite material is from 20 to 12
The thickness is preferably about 0 mm, and if the thickness exceeds 120 mm, the thickness of the metal body side becomes thin, and the life of the stave cooler may be shortened. On the other hand, if the thickness is less than 20 mm, the significance of the presence of the ceramic is reduced, and the effect cannot be obtained.
【0016】セラミック材料としては種々の耐火性、断
熱性を有するものが考えられるが、本発明者らの実験結
果からはAl2 O3 質、ZrO2 質、またはSiC質を
主体とするものが、各物性のもつ特徴と金属材料との合
い性からみて使用上良好な結果が得られることが認めら
れた。セラミック材料の材質、形状、空孔率等の選定は
高炉等の炉内の条件、ステーブ冷却パイプの冷却能力条
件等を勘案して選定するのが好ましい。As the ceramic material, those having various fire resistances and heat insulation properties can be considered. From the experimental results of the present inventors, those mainly composed of Al 2 O 3, ZrO 2 or SiC are considered to have various physical properties. It was confirmed that good results in use were obtained in view of the characteristics of the above and the compatibility with the metal material. The selection of the material, shape, porosity, etc. of the ceramic material is preferably made in consideration of the conditions in the furnace such as the blast furnace, the cooling capacity condition of the stave cooling pipe, and the like.
【0017】更に、セラミック材料と金属材料の複合材
料は、従来のステーブ製造方法で鋳込み煉瓦の代りにセ
ラミック材料を配設し、炉外側の溶融金属材料を注湯侵
入させる鋳造方法で一体かつ一工程で製造可能であり、
密着性を強化した製造の容易なステーブクーラーであ
る。Further, the composite material of the ceramic material and the metal material is integrally and integrally formed by a casting method in which a ceramic material is disposed in place of the cast brick by a conventional stave manufacturing method and a molten metal material outside the furnace is poured into the molten metal. It can be manufactured in the process,
Easy-to-manufacture stave cooler with enhanced adhesion.
【0018】[0018]
【実施例】以下、実施例により本発明を具体的に説明す
る。図1は本発明による実施の一例を示したものであ
り、セラミック材料と鋳鉄の金属材料との複合材料Aを
炉内側に配設したステーブクーラーである。複合材料A
は本体を形成する鋳物4内部に冷却パイプ5を鋳込んだ
ステーブクーラー本体と一体で鋳造する。即ち従来の鋳
込み煉瓦の代りにセラミック材料を配置して鋳造して製
造した。The present invention will be described below in detail with reference to examples. FIG. 1 shows an embodiment according to the present invention, which is a stave cooler in which a composite material A of a ceramic material and a metal material of cast iron is disposed inside a furnace. Composite material A
Is cast integrally with a stave cooler body in which a cooling pipe 5 is cast inside a casting 4 forming the body. That is, it was manufactured by placing and casting a ceramic material instead of the conventional cast brick.
【0019】ステーブクーラー鋳造に際しては、セラミ
ック材料としてはアルミナ質(Al2 O3 を主体とす
る)で、三次元網目状のスケルトンを有した構造で空孔
率(85%)の高い多孔性のものであり、500mm角
×厚さ50mmの板状のものを使用した。ステーブクー
ラー鋳造時には空孔内に溶湯が入り込み、凝固して複合
材料を形成することができた。このステーブクーラーを
実験によって検証したところ、従来のステーブクーラー
に比較して、セラミック(耐火物)部分の損耗も少なく
良好な結果を得ることができることを確認した。At the time of the stave cooler casting, the ceramic material is alumina (mainly composed of Al 2 O 3) having a three-dimensional network skeleton and a high porosity (85%). There was used a 500 mm square × 50 mm thick plate. During the stove cooler casting, the molten metal entered the holes and solidified to form a composite material. When this stave cooler was verified by an experiment, it was confirmed that compared to a conventional stave cooler, the ceramic (refractory) portion was less worn and good results could be obtained.
【0020】[0020]
【発明の効果】本発明によれば、炉内側煉瓦の脱落によ
るプロフィルの急激な変化や炉内側過冷却の問題を解決
でき、かつステーブクーラーの損耗速度も緩やかとな
り、ステーブの長寿命化、即ち炉の寿命延長が可能とな
る。According to the present invention, it is possible to solve the problem of the rapid change of the profile due to the falling off of the brick inside the furnace and the problem of the subcooling inside the furnace, and the wear rate of the stave cooler becomes slow, so that the life of the stave is prolonged. Furnace life can be extended.
【図1】本発明ステーブの例を示す図FIG. 1 is a diagram showing an example of a stave of the present invention.
【図2】従来のステーブの例を示す図FIG. 2 is a diagram showing an example of a conventional stave.
1;炉内側耐火物 2:スタンプ材 3:鋳込み煉瓦 4:鋳物 5:冷却パイプ 6:鉄皮 7:ステーブ取付けボルト 8:圧入材 A:セラミック材料と鋳鉄等の金属材料との複合材料 F:炉壁 1: refractory inside furnace 2: stamp material 3: cast brick 4: casting 5: cooling pipe 6: steel shell 7: stave mounting bolt 8: press-fitting material A: composite material of ceramic material and metal material such as cast iron F: Furnace wall
───────────────────────────────────────────────────── フロントページの続き (72)発明者 穴吹 幸隆 福岡県北九州市戸畑区大字中原46−59 新 日本製鐵株式会社エンジニアリング事業本 部内 Fターム(参考) 4K015 CA04 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Yukitaka Anabuki 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation F-term (reference) 4K015 CA04
Claims (6)
いて、炉内側がセラミック材料と鋳鉄等の金属材料との
複合材料からなり、かつ該複合材料は全域に渡りほぼ均
等なる容積比を有すると共に、炉外側が鋳鉄等の金属材
料中に冷却水を通す冷却管を複数配置して一体的に鋳造
したことを特徴とするステーブクーラー。1. A stave cooler for a metallurgical furnace such as a blast furnace, wherein the inside of the furnace is made of a composite material of a ceramic material and a metal material such as cast iron, and the composite material has a substantially equal volume ratio over the entire area. A stove cooler characterized in that a plurality of cooling pipes through which cooling water passes through a metal material such as cast iron on the outside of the furnace are integrally cast.
成するに当たり、セラミック材料のスケルトンに金属材
料を鋳込んだものであることを特徴とする請求項1記載
のステーブクーラー。2. The stave cooler according to claim 1, wherein a metal material is cast into a skeleton of a ceramic material when forming the composite material portion of the stave cooler.
ック材料の容積比(セラミック材料/全容積)が0.1
超から0.5であることを特徴とするステーブクーラ
ー。3. The method according to claim 1, wherein the volume ratio of the ceramic material (ceramic material / total volume) is 0.1.
A stove cooler characterized by being 0.5 from super.
料の厚さが20から120mmであるとを特徴とするス
テーブクーラー。4. The stove cooler according to claim 1, wherein the thickness of the composite material is 20 to 120 mm.
を特徴とするステーブクーラー。5. A stove cooler characterized by satisfying the requirements of claims 3 and 4 simultaneously.
成するセラミック材として、Al2 O3 質、ZrO2
質、またはSiC質を主体としたものを用いたことを特
徴とする請求項1ないし5のいずれかに記載のステーブ
クーラー。6. The ceramic material forming the composite material portion of the stave cooler is made of Al2 O3, ZrO2.
The stove cooler according to any one of claims 1 to 5, wherein the stove cooler is mainly made of SiC or SiC.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11103656A JP2000297308A (en) | 1999-04-12 | 1999-04-12 | Stave cooler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11103656A JP2000297308A (en) | 1999-04-12 | 1999-04-12 | Stave cooler |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000297308A true JP2000297308A (en) | 2000-10-24 |
Family
ID=14359832
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11103656A Withdrawn JP2000297308A (en) | 1999-04-12 | 1999-04-12 | Stave cooler |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2000297308A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104328236A (en) * | 2014-11-07 | 2015-02-04 | 武汉钢铁(集团)公司 | Method for replacing cooling equipment under blast furnace feeding situation |
CN107299173A (en) * | 2017-07-13 | 2017-10-27 | 上海二十冶建设有限公司 | Segmentation pours the filling method between cooling wall in blast furnace |
CN108885061A (en) * | 2016-02-18 | 2018-11-23 | 哈茨有限公司 | Wearing composite material, its application and its manufacturing method in the cooling element for metallurgical furnace |
-
1999
- 1999-04-12 JP JP11103656A patent/JP2000297308A/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104328236A (en) * | 2014-11-07 | 2015-02-04 | 武汉钢铁(集团)公司 | Method for replacing cooling equipment under blast furnace feeding situation |
CN108885061A (en) * | 2016-02-18 | 2018-11-23 | 哈茨有限公司 | Wearing composite material, its application and its manufacturing method in the cooling element for metallurgical furnace |
CN107299173A (en) * | 2017-07-13 | 2017-10-27 | 上海二十冶建设有限公司 | Segmentation pours the filling method between cooling wall in blast furnace |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20060704 |