JPH06114509A - Method for reducing hydrogen in small lot material in tundish - Google Patents
Method for reducing hydrogen in small lot material in tundishInfo
- Publication number
- JPH06114509A JPH06114509A JP28492892A JP28492892A JPH06114509A JP H06114509 A JPH06114509 A JP H06114509A JP 28492892 A JP28492892 A JP 28492892A JP 28492892 A JP28492892 A JP 28492892A JP H06114509 A JPH06114509 A JP H06114509A
- Authority
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- Japan
- Prior art keywords
- steel
- tundish
- small lot
- casting
- hydrogen
- 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.)
- Pending
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- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼の連続鋳造において
タンディッシュ（以下ＴＤと略記）での成分調整により
製造する小ロット材の水素低減方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reducing hydrogen in a small lot material produced by adjusting the composition of a tundish (hereinafter abbreviated as TD) in continuous casting of steel.
【０００２】[0002]
【従来の技術】鋼の精錬及び鋳造においては、所定のヒ
ートサイズを有する精錬炉及び取鍋の容量単位で行われ
るのが一般的である。2. Description of the Related Art In the refining and casting of steel, the refining furnace and ladle having a predetermined heat size are generally used in units of volume.
【０００３】しかし、この方法によるとヒートサイズよ
りも小さくて注文にリピート性のない言わゆる小ロット
鋼種についても大きなヒートサイズでしか対応できない
ため、余材の増加という弊害を余儀なくされる。このた
め、必要ロットに見合った量の成分調整法並びに鋳造法
が望まれていた。[0003] However, according to this method, even a small-lot steel grade that is smaller than the heat size and has no repeatability in ordering can be handled only with a large heat size, so that the adverse effect of increasing the surplus material is inevitable. Therefore, there has been a demand for a component adjusting method and a casting method in an amount suitable for the required lot.
【０００４】ＴＤによる小ロット製造法に関する従来の
報告例としては、特公昭６３―５３９０１に溶融金属へ
の粉体添加法、特開昭６３―２２０９５３にＰｂ含有鋼
の製造方法、特開平２―２９９７５３に加熱機能を有す
るＴＤ内での成分調整法が述べられている。As examples of conventional reports on a small lot manufacturing method by TD, Japanese Patent Publication No. 63-53901 discloses a method for adding powder to molten metal, Japanese Patent Application Laid-Open No. 63-220953 discloses a method for manufacturing Pb-containing steel, and Japanese Patent Application Laid-Open No. 299753 describes a method for adjusting components in a TD having a heating function.
【０００５】しかるに、ＴＤによる小ロット鋼種の製造
に関して、水素などのガス成分の低減に関する報告は見
当たらない。However, regarding the production of a small-lot steel grade by TD, there is no report on the reduction of gas components such as hydrogen.
【０００６】[0006]
【発明が解決しようとする課題】ＴＤ内に合金元素を添
加して異成分の小ロット鋼種を製造する際、溶鋼の加熱
並びに合金元素の溶解には所定の時間を要し、この成分
調整時間は残溶鋼量や加熱装置の容量及び合金元素の添
加量等に依存する。When an alloy element is added to TD to produce a small lot steel species having a different composition, it takes a predetermined time to heat the molten steel and melt the alloy element. Depends on the amount of residual molten steel, the capacity of the heating device, the amount of alloying elements added, and the like.
【０００７】一般には、炭素、珪素、マンガン、燐、硫
黄、アルミニウム、クローム、モリブデンなどの合金元
素の添加量が合計１〜２％未満の場合には１０分間程
度、添加量の合計が２％以上の場合には大略１０〜５０
分間程度である。Generally, when the total amount of alloying elements such as carbon, silicon, manganese, phosphorus, sulfur, aluminum, chrome and molybdenum is less than 1 to 2%, it takes about 10 minutes, and the total amount is 2%. In the above cases, approximately 10-50
It's about a minute.
【０００８】一方、ガス成分としての水素についても、
通常ＴＤには脱ガス機能はないので、添加合金やＴＤ耐
火物中の水分から混入する問題がある。この水素ピック
アップ量は、添加合金量が多いほどまた成分調整時間が
長いほど増加する傾向がある。On the other hand, regarding hydrogen as a gas component,
Since TD usually does not have a degassing function, there is a problem that it is mixed from the additive alloy and water in the TD refractory. This hydrogen pickup amount tends to increase as the amount of added alloy increases and the component adjustment time increases.
【０００９】言うまでもなく、水素は鋼材の水素性欠陥
となるのみならず、連鋳片や鋼片の軸心部に集積して毛
割れやセンターポロシティーの形成を助長したりするの
で有害である。Needless to say, hydrogen is not only a hydrogen-like defect in the steel material but also accumulates in the axial center portion of the continuous cast piece and the steel piece to promote the formation of hair cracks and center porosity, which is harmful. .
【００１０】従って、ＴＤ小ロット製造においても水素
低減方法を確立することが極めて重要である。Therefore, it is extremely important to establish a hydrogen reduction method even in TD small lot production.
【００１１】[0011]
【課題を解決するための手段】本発明は、上記課題を解
決するものである。即ち、取鍋からの母溶鋼の注入終了
後にＴＤ内に任意の量の母溶鋼を残した状態で、ＴＤノ
ズルを閉止して鋳造を一旦停止し、残溶鋼を加熱しなが
ら所要合金元素を添加して異成分の小ロット鋼種を製造
する方法において、前記取鍋内母溶鋼を脱ガス処理する
と共に、小ロット鋼種の製造前に前記ＴＤにて複数チャ
ージの鋳造を行った後、該ＴＤを用いて小ロット鋼種を
製造するものである。The present invention is to solve the above problems. That is, after the injection of the mother molten steel from the ladle is completed, the TD nozzle is closed to temporarily stop the casting with the desired amount of the mother molten steel left in the TD, and the required alloy elements are added while heating the remaining molten steel. In the method for producing a small lot steel species of different components by degassing the ladle molten steel in the ladle and casting a plurality of charges in the TD before producing the small lot steel species, the TD is It is used to manufacture small lot steel grades.
【００１２】[0012]
【作用】発明者らは、鋳造に使用した後のＴＤについて
冷間で整備し内張り耐火材をガンニングし、ＴＤストッ
パーノズルや浸漬ノズルなどをセットした後、第１表に
示す条件で予備乾燥及び予熱を行い鋳造に使用した。The inventors of the present invention cold-maintened the TD after it was used for casting, gunned the lining refractory material, set the TD stopper nozzle, the dipping nozzle, etc., and then pre-dried it under the conditions shown in Table 1. It was preheated and used for casting.
【００１３】取鍋注入終了後にＴＤ内に溶鋼を２０トン
残し、合金を少量添加し加熱溶解を行った。After the completion of pouring in the ladle, 20 tons of molten steel was left in the TD, a small amount of alloy was added, and heating and melting were performed.
【００１４】図１に、成分調整中の水素ピックアップの
状況を示した。時間の経過と共に水素のピックアップ量
が増加する傾向にあるが、ＴＤの乾燥強化により低減効
果のあることが判る。FIG. 1 shows the situation of hydrogen pickup during component adjustment. Although the amount of hydrogen picked up tends to increase with the lapse of time, it can be seen that there is a reduction effect due to the strengthening of TD drying.
【００１５】この方法は、ＴＤ耐火物中の水分を除去す
るものであるが、相当に長時間の乾燥が必要のため生産
効率が悪い欠点がある。This method removes the water content in the TD refractory, but has the drawback of poor production efficiency because it requires drying for a considerably long time.
【００１６】そこで、小ロット鋼種を製造する前に複数
チャージの鋳造を行った後のＴＤを用いて小ロット鋼種
の成分調整を行った。Therefore, the composition of the small lot steel grade was adjusted by using TD after casting a plurality of charges before producing the small lot steel grade.
【００１７】図２に、その場合の状況を示す。図から明
らかなように、時間経過に伴う水素のピックアップ量の
上昇は認められない。FIG. 2 shows the situation in that case. As is clear from the figure, no increase in the amount of hydrogen picked up over time is observed.
【００１８】これは、多連々鋳の実施により、ＴＤ耐火
物中の水分が除去された効果と考えられる。This is considered to be the effect of removing the water content in the TD refractory by performing the multiple casting.
【００１９】ここで、本発明では小ロット鋼種の製造前
に鋳造するチャージ数は２以上とする。Here, in the present invention, the number of charges cast before the production of a small lot steel type is set to 2 or more.
【００２０】その理由は、溶鋼の温度は通常１，５００
〜１，５５０℃あり、２チャージの鋳造時間（約２時
間）で水分は殆ど除去されることによるものである。The reason is that the temperature of molten steel is usually 1,500.
This is because most of the water is removed in a casting time of 2 charges (about 2 hours) at ˜1,550 ° C.
【００２１】また本発明では、小ロット鋼種製造のため
にＴＤ内に残湯処理する母溶鋼については、二次精錬過
程で予め脱ガス処理を行い水素濃度を低下せしめる。Further, in the present invention, the mother molten steel to be treated with the residual hot water in the TD for producing a small lot steel grade is subjected to a degassing treatment in advance in the secondary refining process to reduce the hydrogen concentration.
【００２２】それは、ＴＤには前述の如く脱ガス機能が
なく脱水素が望めないからである。This is because TD does not have a degassing function as described above and dehydrogenation cannot be expected.
【００２３】従って、母溶鋼の脱ガス後の水素濃度とＴ
Ｄ内ピックアップ量とを加えた値が、小ロット鋼種の水
素濃度となるため、本発明ではその合計値が管理範囲内
に入るように、予め脱ガス処理による水素低減及びＴＤ
の事前の複数チャージ鋳造による水素ピックアップ防止
を図るものである。Therefore, the hydrogen concentration and T after degassing of the molten steel
Since the value including the pickup amount in D becomes the hydrogen concentration of the small lot steel type, in the present invention, hydrogen reduction and TD by degassing treatment are performed in advance so that the total value falls within the control range.
This is intended to prevent hydrogen pickup by the multiple charge casting in advance.
【００２４】本発明によれば、ＴＤに脱ガス機能を設置
せずに簡易な方法により水素濃度を低減できるために、
効率的に小ロット鋼種を製造することが出来る。According to the present invention, the hydrogen concentration can be reduced by a simple method without installing a degassing function in the TD.
Small lot steel grades can be manufactured efficiently.
【００２５】[0025]
【実施例】実施例について、以下に詳細に説明する。湾
曲型連鋳機において、鋳片サイズが３５０ｍｍ×５６０
ｍｍのブルームを鋳造した。EXAMPLES Examples will be described in detail below. In a curved continuous casting machine, the slab size is 350 mm x 560
mm blooms were cast.
【００２６】中間溝型誘導加熱装置（１，０００ＫＷ×
２基）を備えた容量３０トンのＴＤを用い、２７０トン
転炉で溶製し次いでＲＨ真空脱ガス設備により、溶鋼中
［Ｈ］≦１．５ｐｐｍ以下に脱ガスした機械構造用鋼
（Ｓ２０Ｃ）を母溶鋼として、取鍋注入終了後にＴＤ内
に目的量２０トンを残した状態で、ストッパーノズルを
閉止し、鋳造及び鋳片の引き抜きを一旦停止した。Intermediate groove type induction heating device (1,000 kW ×
(2 units) using a TD with a capacity of 30 tons, a 270 ton converter, and then a RH vacuum degassing equipment to degas the molten steel to [H] ≦ 1.5 ppm or less (S20C). ) Was used as the mother molten steel, the stopper nozzle was closed while leaving the target amount of 20 tons in the TD after the pouring of the ladle was completed, and the casting and the withdrawal of the cast piece were once stopped.
【００２７】次いで、ＴＤ内溶鋼を誘導加熱しながら、
クローム（ＦｅＣｒ３１５Ｋｇ）並びにモリブデン（Ｆ
ｅＭｏ５０Ｋｇ）を添加してＣｒ―Ｍｏ鋼を溶製した。Then, while induction-heating the molten steel in TD,
Chrome (FeCr315Kg) and molybdenum (F
eMo50Kg) was added to melt the Cr-Mo steel.
【００２８】溶鋼加熱、合金添加、温度調整を含めた成
分調整時間の合計は１０分間であった。The total time for adjusting the components, including heating the molten steel, adding the alloy, and adjusting the temperature, was 10 minutes.
【００２９】ＴＤとしては、水素ピックアップを防止す
るために小ロット鋼種を製造する前に７チャージの鋳造
を行った後、前記母溶鋼のＳ２０Ｃを鋳造した。小ロッ
ト鋼種の製造結果を第２表に示す。As the TD, in order to prevent hydrogen pick-up, 7-charge casting was performed before producing a small-lot steel grade, and then S20C of the mother molten steel was cast. Table 2 shows the results of manufacturing small-lot steel grades.
【００３０】水素について、合金鉄等から０．８ｐｐｍ
ピックアップしているが、目標範囲を十分に満足してい
る。0.8 ppm of hydrogen from ferroalloys
I picked it up, but I am satisfied with the target range.
【００３１】比較のために、脱ガス処理は行ったがＴＤ
１チャージ目で製造した小ロット鋼種の成分値も併記し
たが、ＴＤ１チャージ目（且つ予備乾燥もなし）のため
に、水素ピックアップ量が大きく目標範囲を外れてい
る。For comparison, degassing was performed but TD
The component values of the small-lot steel type produced at the first charge are also shown, but the hydrogen pickup amount is largely outside the target range because of the TD first charge (and no preliminary drying).
【００３２】本発明になる上記の方法で製造した小ロッ
ト材を成品圧延し検査した結果、毛割れやその他の水素
性欠陥の発生は皆無であった。As a result of rolling and inspecting the small lot material manufactured by the above method according to the present invention, hair cracking and other hydrogen defects were not found at all.
【００３３】[0033]
【表１】 [Table 1]
【００３４】[0034]
【表２】 [Table 2]
【００３５】[0035]
【発明の効果】以上のように、本発明は生産工程的にも
エネルギー的にも効率よく高品質の小ロット材を製造す
ることが可能であり、その工業的な価値は極めて高い。INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to efficiently manufacture a high quality small lot material both in terms of production process and energy, and its industrial value is extremely high.
【図１】予備乾燥ＴＤでの水素ピックアップを示す図。FIG. 1 is a diagram showing hydrogen pickup in pre-drying TD.
【図２】本発明での水素挙動を示す図。FIG. 2 is a diagram showing hydrogen behavior in the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 功夫 室蘭市仲町12番地 新日本製鐵株式会社室 蘭製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Suzuki, No. 12 Nakamachi, Muroran City Shin Nippon Steel Co., Ltd. Muroran Works
Claims (1)
注入終了後にタンディッシュ内に任意の量の母溶鋼を残
した状態で、タンディッシュノズルを閉止して鋳造を一
旦停止し、残溶鋼を加熱しながら所要合金元素を添加し
て異成分の小ロット鋼種を製造する方法において、前記
取鍋内母溶鋼を脱ガス処理すると共に、小ロット鋼種の
製造前に前記タンディッシュにて複数チャージの鋳造を
行った後、該タンディッシュを用いて小ロット鋼種を製
造することを特徴とするタンディッシュ小ロット材の水
素低減方法。1. In the casting of steel, after the injection of the mother molten steel from the ladle is finished, an arbitrary amount of the mother molten steel is left in the tundish, and the tundish nozzle is closed to temporarily stop the casting. In the method of manufacturing a small lot steel species of different components by adding required alloy elements while heating the molten steel, degassing the molten steel in the ladle, and making a plurality of pieces in the tundish before producing the small lot steel species. A method for reducing hydrogen in a tundish small lot material, which comprises producing a small lot steel grade using the tundish after casting a charge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28492892A JPH06114509A (en) | 1992-10-01 | 1992-10-01 | Method for reducing hydrogen in small lot material in tundish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28492892A JPH06114509A (en) | 1992-10-01 | 1992-10-01 | Method for reducing hydrogen in small lot material in tundish |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06114509A true JPH06114509A (en) | 1994-04-26 |
Family
ID=17684878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28492892A Pending JPH06114509A (en) | 1992-10-01 | 1992-10-01 | Method for reducing hydrogen in small lot material in tundish |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06114509A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63199055A (en) * | 1987-02-10 | 1988-08-17 | Kawasaki Steel Corp | Continuous casting method for different kinds of steel |
| JPS6411057A (en) * | 1987-07-03 | 1989-01-13 | Nippon Steel Corp | Continuous casting method for metals having different composition and small lot |
-
1992
- 1992-10-01 JP JP28492892A patent/JPH06114509A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63199055A (en) * | 1987-02-10 | 1988-08-17 | Kawasaki Steel Corp | Continuous casting method for different kinds of steel |
| JPS6411057A (en) * | 1987-07-03 | 1989-01-13 | Nippon Steel Corp | Continuous casting method for metals having different composition and small lot |
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