JPS642653B2 - - Google Patents
Info
- Publication number
- JPS642653B2 JPS642653B2 JP58218484A JP21848483A JPS642653B2 JP S642653 B2 JPS642653 B2 JP S642653B2 JP 58218484 A JP58218484 A JP 58218484A JP 21848483 A JP21848483 A JP 21848483A JP S642653 B2 JPS642653 B2 JP S642653B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- stamp
- steel ingot
- zone
- quicklime
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 66
- 239000010959 steel Substances 0.000 claims description 66
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000011819 refractory material Substances 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 32
- 238000000034 method Methods 0.000 description 19
- 238000004857 zone melting Methods 0.000 description 17
- 239000000292 calcium oxide Substances 0.000 description 16
- 235000012255 calcium oxide Nutrition 0.000 description 16
- 238000010304 firing Methods 0.000 description 7
- 235000019738 Limestone Nutrition 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 239000006028 limestone Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 3
- 229910001628 calcium chloride Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000012779 reinforcing material Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 235000008098 Oxalis acetosella Nutrition 0.000 description 1
- 240000007930 Oxalis acetosella Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 235000014443 Pyrus communis Nutrition 0.000 description 1
- 241000316887 Saissetia oleae Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 101150038956 cup-4 gene Proteins 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000011086 high cleaning Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】
本発明は極めて信頼性の高い高品質鋼塊を製造
する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing extremely reliable high quality steel ingots.
従来、ゾーンメルト法は半導体用金属材料のゲ
ルマニユームやシリコン等を高度に精製する方法
として開発され、金属材料の高純度化あるいは組
成や組織の均一化等に対して極めて有効な手段で
あることが広く知られている。 In the past, the zone melt method was developed as a method for highly refining semiconductor metal materials such as germanium and silicon, and it has been shown to be an extremely effective means for achieving high purity of metal materials and homogenizing their composition and structure. widely known.
そこでこの方法を鋼に適用して高品質鋼塊を得
ようとする試みがなされたが、実験室的な小規模
では実施可能であるが、実用鋼の規模では未だ実
現されていなかつた。 Therefore, attempts have been made to apply this method to steel to obtain high-quality steel ingots, but although it can be carried out on a small-scale laboratory scale, it has not yet been realized on a practical steel scale.
すなわち実用鋼の場合は半導体金属等に比較し
て極めて巨大なインゴツトを取扱わねばならぬこ
とと、鋼の溶融温度が極めて高いこと、また鋼の
溶融凝固には多量のガス発生又は吸収を伴うこ
と、さらに費用があまり掛つたのでは実用的でな
い等々の理由で、半導体金属で行なわれているゾ
ーンメルト法をそのまま鋼に適用することは困難
であつた。 In other words, in the case of practical steel, it is necessary to handle extremely large ingots compared to semiconductor metals, etc., the melting temperature of steel is extremely high, and the melting and solidification of steel involves the generation or absorption of a large amount of gas. Furthermore, it has been difficult to apply the zone melting method used for semiconductor metals to steel as it is, for reasons such as being too expensive and impractical.
ところでこれ等の困難を十分検討すると鋼のゾ
ーンメルトするのに最適な耐火物が見出されれば
すべて解決出来ることが明らかである。 By the way, if these difficulties are thoroughly studied, it is clear that all of them can be solved if the optimum refractory for zone melting of steel is found.
本発明はこの耐火物として、生石灰(CaO)質
耐火物を適用しセラミツクフアイバー製布又は帯
をその補強材として用いることによつて前記の各
種困難を克服し、実用鋼塊のゾーンメルトを可能
にしたことを特徴とするものである。 The present invention overcomes the above-mentioned difficulties by applying quicklime (CaO)-based refractories as the refractories and using ceramic fiber cloth or bands as reinforcing materials, thereby making zone melting of practical steel ingots possible. It is characterized by the following.
一般に、生石灰質耐火物は我国に多量に産出す
る石灰石を原料として得られるもので、不純物の
低い高品質の物を極めて安価に大量に入手出来る
ものである。 In general, quicklime refractories are obtained from limestone, which is produced in large quantities in Japan, and are of high quality with low impurities and can be obtained in large quantities at extremely low prices.
また、生石灰は高温で安定性があり高温強度も
あり高温真空下でも揮発しにくく、融点も2500℃
以上と高く、通常気孔率が50%近くあつて通気度
が良く断熱性に富み、溶鋼中の不純物を吸収除去
する能力があり、且溶鋼と接触しても非金属介在
物となつて鋼を汚染することが無い等、鋼精錬に
対して極めてすぐれた数々の特性を備えているこ
とが知られている。しかしながら、生石灰質耐火
物は大気中で水分等を吸収して消石灰等となり粉
化してしまう耐火物としては決定的な欠点があ
り、通常の炉用耐火物としては反復使用に耐えら
れず今日迄、生石灰質耐火物は特殊な試用例があ
るのみで実用化されていなかつた。 In addition, quicklime is stable and strong at high temperatures, does not easily volatilize even under high-temperature vacuum conditions, and has a melting point of 2500℃.
It usually has a porosity of close to 50%, has good air permeability, is rich in heat insulation, has the ability to absorb and remove impurities in molten steel, and even when it comes into contact with molten steel, it becomes non-metallic inclusions and It is known to have many excellent properties for steel refining, such as being free from contamination. However, quicklime refractories have a decisive drawback as refractories, as they absorb moisture in the atmosphere and turn into powder, such as slaked lime.As a refractory for ordinary furnaces, they cannot withstand repeated use, and to this day, they cannot withstand repeated use. However, quicklime refractories have only been used in special trials and have not been put into practical use.
本発明による鋼塊ゾーンメルトの場合には耐火
物を反復使用する必要がなく各鋼塊毎に一度だけ
耐火物として耐えれば良い方法であるため前記の
生石灰質耐火物のもつ数多くのすぐれた特性を有
効に活用して初めて実用鋼ゾーンメルト鋼塊の製
造が可能となつたものである。すなわち、生石灰
の耐火度が極めて高いために溶鋼温度に十分耐え
且つ高温強度も安定しておりセラミツクフアイバ
ー製布等の補強の下に実用鋼規模の溶鋼重量にも
耐え、且つガスの通気度もあり鋼に対する精錬能
力も有効に作用し、しかも極めて安価であること
によつて、前記の実用鋼のゾーンメルトを困難と
していた原因をすべて解決することが可能となつ
た。 In the case of the steel ingot zone melt according to the present invention, there is no need to repeatedly use the refractory, and each steel ingot only needs to be used as a refractory once, so the quicklime refractory has many excellent properties. It was only by making effective use of this that it became possible to produce practical zone melt steel ingots. In other words, quicklime has extremely high refractory properties, so it can withstand the temperature of molten steel and has stable high-temperature strength.It can withstand the weight of molten steel equivalent to that of practical steel when reinforced with ceramic fiber cloth, and has good gas permeability. Since the refining ability for dovetail steel works effectively and it is extremely inexpensive, it has become possible to solve all of the causes of difficulty in zone melting of practical steel.
本発明を図面に示す実施例によつてさらに詳述
する。図は本発明の一実施例であつてこの例によ
つて本発明は何ら制限されるものではない。図は
実用鋼塊を縦方式でゾーンメルトを行う場合の工
程を説明する縦断面図である。第1図と第2図は
鋼塊外周面に石灰質耐火物をスタンプする工程
を、第3図は加熱焼成工程、第4図はゾーンメル
ト工程をそれぞれ示し、第5図はゾーンメルト部
分の詳細図を示す。図で1はゾーンメルトを行う
鋼塊で熱効率の点から円形断面が好ましいが、連
続鋳造等で得られる角型断面の鋼塊をそのまま用
いることも可能である。鋼塊の一番上部にはクレ
ーン等で吊れるように吊具2を取り付けておく。
また、ゾーンメルト鋼塊の品質を高めるためには
鋼塊の黒皮をシヨツトブラストがグラインダー研
削等で除去しておくのが好ましい。 The present invention will be explained in further detail with reference to embodiments shown in the drawings. The figure shows one embodiment of the present invention, and the present invention is not limited to this example in any way. The figure is a longitudinal sectional view illustrating the process of vertically zone melting a practical steel ingot. Figures 1 and 2 show the process of stamping calcareous refractories on the outer peripheral surface of the steel ingot, Figure 3 shows the heating and firing process, Figure 4 shows the zone melting process, and Figure 5 shows details of the zone melting part. Show the diagram. In the figure, 1 is a steel ingot subjected to zone melting, and from the point of view of thermal efficiency, it is preferable to have a circular cross section, but it is also possible to use a steel ingot with a rectangular cross section obtained by continuous casting or the like as is. A hoist 2 is attached to the top of the steel ingot so that it can be hoisted by a crane or the like.
Further, in order to improve the quality of the zone melt steel ingot, it is preferable to remove black scales from the steel ingot by shot blasting, grinding, etc.
以下315mm中断面の連続鋳造製ブルームのゾー
ンメルトの場合を例にして具体的数値を記す。 Specific values are described below using as an example the case of zone melt of continuous casting bloom with 315 mm interrupted surface.
まず第1図でスタンプ開始方法を説明する。定
盤3の上に耐火レンガ製底カツプ4を置く、これ
はスタンプの底部を補強するもので例えばシヤモ
ツト質のものであれば反復使用出来る。次いで底
カツプの周囲に縦に二つ割れとなるスタンプ用金
枠5をセツトする。枠の寸法は鋼塊外周に75〜
100mm厚のスタンプが出来るものを用いる。 First, the stamp starting method will be explained with reference to FIG. A bottom cup 4 made of refractory brick is placed on the surface plate 3. This is used to reinforce the bottom of the stamp, and if it is made of, for example, shamrock, it can be used repeatedly. Next, a stamp metal frame 5 that is split vertically into two is set around the bottom cup. The dimensions of the frame are 75~ on the outer circumference of the steel ingot.
Use something that can make a 100mm thick stamp.
次に石灰質耐火物6を底カツプ内底面より約
150mmまでスタンプした後鋼塊1をその中心上に
セツトする。次に鋼塊側面を同じくスタンプ枠5
の上部迄石灰質耐火物6でスタンプしてゆく。 Next, add the calcareous refractory 6 from the inner bottom of the bottom cup.
After stamping up to 150 mm, set the steel ingot 1 on its center. Next, stamp the side of the steel ingot with the same stamp frame 5.
Stamp with calcareous refractory 6 up to the top.
なお、石灰質耐火物6は例えば高純度の石灰石
(CaCOa)あるいは生石灰(CaO)又はその混合
物を用い5mm以下に砕いた粒と微粉を含んだもの
に、生石灰―塩化カルシユーム(CaO―CaCl2)
系フラツクス又は塩化カルシユームのエタノール
溶液等をバインダーとしたものを用いる。 The calcareous refractory 6 is made of, for example, high-purity limestone (CaCOa), quicklime (CaO), or a mixture thereof, which contains particles crushed to 5 mm or less and fine powder, and quicklime-calcium chloride (CaO-CaCl 2 ).
A binder such as a system flux or an ethanol solution of calcium chloride is used.
ここで使用する石灰石と塩化カルシユームの量
と比率を調整することによつてスタンプを焼成し
た後の通気度をコントロールすることが可能であ
る。 By adjusting the amounts and ratios of limestone and calcium chloride used here, it is possible to control the air permeability after firing the stamp.
次に第2図に示す如くスタンプ用割金枠5を順
次鋼塊上部にずらしつつ鋼塊頂部までスタンプを
行う。一方スタンプの終了した部分にはガラス繊
維あるいはアスベストその他のセラミツクフアイ
バーで織つた布又は帯7を巻き付けてスタンプを
補強してゆく。 Next, as shown in FIG. 2, stamping is performed up to the top of the steel ingot while sequentially shifting the stamping split frame 5 to the top of the steel ingot. On the other hand, the stamp is reinforced by wrapping a cloth or band 7 made of glass fiber, asbestos or other ceramic fiber around the finished part of the stamp.
スタンプが完了した鋼塊は第3図の如き加熱炉
8内に収納し加熱焼成し、スタンプ材中の水分、
バインダー中の揮発分等を除去し、使用した石灰
石の完全分解を計りスタンプを均一な生石灰質層
となす。この時焼成炉は減圧出来るようにすると
低温で焼成が完了し、セラミツクフアイバー製補
強材を痛めずにすみ反復使用が可能となる。第3
図で9は減圧排気口、10は加熱用ヒーターをそ
れぞれ示す。焼成が終了したら第4図に示すゾー
ンメルト用真空チヤンバー11に収納して縦方式
ゾーンメルトを実施する。図で12は支持台で誘
導加熱コイル14の収納部も兼ねる。鋼塊は支持
台上にセツトすると同時に吊具2を界してハンガ
ー15によつて吊つた状態に保持する。これは鋼
塊の自重でゾーンメルト部分に圧力がかかり過ぎ
てバルジングによる溶鋼のブレークアウトを防止
するために重要である。 The stamped steel ingot is stored in a heating furnace 8 as shown in Fig. 3 and heated and fired to remove moisture in the stamp material.
The volatile matter in the binder is removed, and the used limestone is completely decomposed to form a uniform quicklime layer on the stamp. At this time, if the pressure in the firing furnace can be reduced, firing will be completed at a low temperature, and the ceramic fiber reinforcement will not be damaged and can be used repeatedly. Third
In the figure, 9 indicates a vacuum exhaust port, and 10 indicates a heating heater. After the firing is completed, the product is stored in a vacuum chamber 11 for zone melting shown in FIG. 4, and vertical zone melting is performed. In the figure, reference numeral 12 denotes a support stand which also serves as a storage part for the induction heating coil 14. The steel ingot is set on the support table and at the same time is held in a suspended state by a hanger 15 across the hanging tool 2. This is important to prevent breakout of molten steel due to bulging due to excessive pressure being applied to the zone melt part due to the weight of the steel ingot.
セツトが完了したら真空排気口13より排気を
行い誘導加熱コイルに入力を加えて一定の速度で
鋼塊周を上昇せしめてゾーンメルトを行う。ゾー
ンメルト進行中の詳細は第5図に示す如き状況が
進行しているものと想像される。加熱コイル14
の内部附近が溶融状態16となりルツボ型誘導炉
内の溶鋼と同様の矢印の如き流動を行い生石灰質
スタンプ層6と充分接触して燐、硫黄等の不純物
や非金属介在物が吸収除去されて清浄鋼となつた
後コイル14の上昇とともにゾーンメルト鋼17
として内部ポロシイテイー等の欠陥や成分偏析等
の全く無い均一な組織の高品質鋼塊が生成する。 When the setting is completed, exhaust is exhausted from the vacuum exhaust port 13, input is applied to the induction heating coil, and the circumference of the steel ingot is raised at a constant speed to perform zone melting. The details of the progress of the zone melt are as shown in FIG. 5. heating coil 14
The vicinity of the interior becomes molten 16, flows as shown by the arrow similar to the molten steel in a crucible-type induction furnace, and comes into sufficient contact with the quicklime stamp layer 6, so that impurities such as phosphorus and sulfur and non-metallic inclusions are absorbed and removed. After becoming clean steel, as the coil 14 rises, the zone melt steel 17
As a result, a high-quality steel ingot with a uniform structure is produced, with no defects such as internal porosity or component segregation.
又ゾーンメルト過程を本例の如く真空下で行う
場合は、生石灰質耐火物の通気度が良いことによ
つて溶鋼中の水素、酸素、窒素等の脱ガスによる
鋼の清浄化も行われる。特に本発明による方法
は、普通鋼よりも不純物を除去することが困難と
されている高合金鋼、例えばステンレス鋼や耐熱
鋼等の高純度清浄鋼塊を得る場合に著しい効果が
ある。 Further, when the zone melting process is carried out under vacuum as in this example, the quicklime refractory has good air permeability, so that the steel is cleaned by degassing hydrogen, oxygen, nitrogen, etc. in the molten steel. Particularly, the method according to the present invention is extremely effective in obtaining a high-purity clean steel ingot of high alloy steel, such as stainless steel or heat-resistant steel, from which impurities are more difficult to remove than ordinary steel.
一実施例では、脱酸剤となるアルミニユームを
0.2%合金添加した18―8ステンレス鋼塊に
10-5torrの真空下で本発明によるゾーンメルト法
を適用すれば、従来のAOD法やVOD法による製
鋼法では30ppm程度が限界とされている酸素含有
量を数ppm(初期含有量250ppm)まで低減するこ
とが可能であり、同時に10ppm程度が限界とされ
ている硫黄が1ppm以下(初期含有量90ppm)に
低減される。その他の不純物や非金属界在物も溶
鋼が生石灰質スタンプ層6と十分接触して吸収除
去される効果とゾーンメルト効果とが加わつて高
清浄化が行われ、その耐孔食性及び耐発銹性を従
来の市販鋼に比べて著しく改善することが可能で
ある。なおゾーンメルト過程で鋼は相当大きな熱
膨張、収縮があり、生石灰質耐火物で鋼と接触し
た焼結部分にはクラツクが生じるものと思われる
が生石灰の耐火度が高く気孔が多く断熱性に富む
ために焼結層の近傍はなお粉状、生石灰の状態で
且つセラミツクフアイバー製補強材で保持されて
いるために溶鋼のブレークアウト等は防止れ、鋼
の膨張収縮に充分耐えられる。以上の場合用いる
石灰質耐火物は石灰石換算で鋼塊100当り25〜30
ですみ、バインダーは1〜3程度で石灰質耐火物
の原単位はあまり問題とならず、他の再溶解精製
法であるE.S.R.とほぼ同等の費用で実施可能であ
る。ゾーンメルト完了後はスタンプ層6に水をか
けて水酸化カルシユームとなしスタンプ層を粉化
除去する。 In one embodiment, aluminum is used as a deoxidizing agent.
18-8 stainless steel ingot with 0.2% alloy added
If the zone melting method according to the present invention is applied under a vacuum of 10 -5 torr, the oxygen content can be reduced to several ppm (initial content 250ppm), which is limited to about 30ppm in conventional steel manufacturing methods using AOD and VOD methods. At the same time, sulfur, which is considered to be a limit of about 10 ppm, can be reduced to less than 1 ppm (initial content: 90 ppm). Other impurities and non-metallic inclusions are also absorbed and removed by the molten steel through sufficient contact with the quicklime stamp layer 6, and the zone melt effect is added to achieve high cleaning, resulting in improved pitting corrosion and rusting resistance. can be significantly improved compared to conventional commercially available steels. During the zone melting process, steel undergoes considerable thermal expansion and contraction, and cracks are expected to occur in the sintered parts of the quicklime refractory that come into contact with the steel. Since the sintered layer is rich in powder, the vicinity of the sintered layer is still in the state of powder or quicklime, and is supported by ceramic fiber reinforcing material, which prevents breakout of the molten steel and sufficiently withstands the expansion and contraction of the steel. In the above cases, the calcareous refractory used is 25 to 30 limestone equivalent per 100 steel ingots.
Since the binder is about 1 to 3, the unit consumption of calcareous refractories is not much of a problem, and it can be implemented at almost the same cost as ESR, which is another remelting refining method. After completion of zone melting, water is poured onto the stamp layer 6 to remove calcium hydroxide and the pear stamp layer by powdering them.
本発明によつて製造されるゾーンメルト鋼塊は
他の製造方法では不可能な、均一な一方向凝固鋼
塊や均一な超清浄無欠陥鋼塊となり信頼性が極め
て高い結果鋼の利用分野をさらに拡張する効果が
あり、その経済的意義は極めて大きい。 The zone melt steel ingot produced by the present invention has extremely high reliability, such as a uniform directionally solidified steel ingot and a uniform ultra-clean defect-free steel ingot, which are impossible with other manufacturing methods. It has the effect of further expansion, and its economic significance is extremely large.
図は本発明の一実施例を説明する縦断面図で第
1図、第2図は鋼塊外周面に石灰質耐火物をスタ
ンプする工程を、第3図はその加熱焼成工程を、
第4図はゾーンメルト工程を、第5図はゾーンメ
ルト進行中の詳細をそれぞれ示す。図で1はゾー
ンメルトを行う鋼塊、2は鋼塊の吊具、3は定
盤、4は耐火レンガ製底カツプ、5は縦に二つ割
れとなるスタンプ用金枠、6は石灰質耐火物スタ
ンプ材、7はセラミツクフアイバー製布又は帯の
補強材、8は加熱焼成炉、9は減圧排気口、10
は加熱用ヒーター、11はゾーンメルト用真空チ
ヤンバー、12は支持台、13は真空排気口、1
4は誘導加熱用コイル、15はハンガー、16は
ゾーンメルト中の溶鋼部分、17はゾーンメルト
鋼塊をそれぞれ示す。
The figures are longitudinal cross-sectional views illustrating one embodiment of the present invention, and Fig. 1 shows the process of stamping calcareous refractories on the outer peripheral surface of the steel ingot, and Fig. 3 shows the heating and firing process.
FIG. 4 shows the zone melt process, and FIG. 5 shows details during the zone melt process. In the figure, 1 is a steel ingot for zone melting, 2 is a hanging tool for the steel ingot, 3 is a surface plate, 4 is a firebrick bottom cup, 5 is a metal frame for a stamp that is split vertically into two, and 6 is a calcareous fireproof 7 is a reinforcing material for ceramic fiber cloth or band; 8 is a heating and firing furnace; 9 is a vacuum exhaust port; 10
1 is a heater for heating, 11 is a vacuum chamber for zone melting, 12 is a support stand, 13 is a vacuum exhaust port, 1
Reference numeral 4 indicates an induction heating coil, 15 a hanger, 16 a molten steel portion in a zone melt, and 17 a zone melt steel ingot.
Claims (1)
スタンプの外表面にセラミツクフアイバー製布又
は帯を巻き付けて該スタンプを補強し、次いでこ
れを加熱焼成した後誘導加熱コイルによつてゾー
ンメルトを行い、高品質鋼塊を得ることを特徴と
したゾーンメルト鋼塊製造方法。1 Stamp calcareous refractories on the outer circumferential surface of the steel ingot, reinforce the stamp by wrapping a ceramic fiber cloth or band around the outer surface of the stamp, then heat and sinter it, and then create zone melt using an induction heating coil. A zone melt steel ingot manufacturing method characterized by obtaining high quality steel ingots.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58218484A JPS60110818A (en) | 1983-11-18 | 1983-11-18 | Production of zone melt steel ingot |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58218484A JPS60110818A (en) | 1983-11-18 | 1983-11-18 | Production of zone melt steel ingot |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60110818A JPS60110818A (en) | 1985-06-17 |
JPS642653B2 true JPS642653B2 (en) | 1989-01-18 |
Family
ID=16720643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58218484A Granted JPS60110818A (en) | 1983-11-18 | 1983-11-18 | Production of zone melt steel ingot |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60110818A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0656785B2 (en) * | 1990-09-24 | 1994-07-27 | メサッド エレクトロニクス インコーポレイテッド | Clock spring housing and assembly |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6428331A (en) * | 1987-07-22 | 1989-01-30 | Daiho Giken | Method for remelting metal |
-
1983
- 1983-11-18 JP JP58218484A patent/JPS60110818A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0656785B2 (en) * | 1990-09-24 | 1994-07-27 | メサッド エレクトロニクス インコーポレイテッド | Clock spring housing and assembly |
Also Published As
Publication number | Publication date |
---|---|
JPS60110818A (en) | 1985-06-17 |
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