JPS6283457A - Manufacturing of titanium hot-rolled plate - Google Patents
Manufacturing of titanium hot-rolled plateInfo
- Publication number
- JPS6283457A JPS6283457A JP22364385A JP22364385A JPS6283457A JP S6283457 A JPS6283457 A JP S6283457A JP 22364385 A JP22364385 A JP 22364385A JP 22364385 A JP22364385 A JP 22364385A JP S6283457 A JPS6283457 A JP S6283457A
- Authority
- JP
- Japan
- Prior art keywords
- hot
- titanium
- rolled
- temperature
- rolled plate
- 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
Links
Landscapes
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は熱間圧延終了後に再結晶が完了したチタン熱延
板の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a titanium hot rolled sheet in which recrystallization has been completed after hot rolling.
（従来の技術）
従来、純チタン熱延板は、ステツケルミルによって製造
されていたが、近年チタン製品の需要が増大したことと
も相まって、安価で大目の生産方式である鉄鋼の連続熱
延設備を活用してチタン熱延板の製造が行われる様にな
って来た（例えば、特公昭５５−２１２６号公報、特公
昭５９−４１５０８号公報、特開昭６０−３３８０５号
公報など）。(Conventional technology) Conventionally, pure titanium hot-rolled sheets were manufactured using Stetskell mills, but as demand for titanium products has increased in recent years, continuous hot-rolling equipment for steel, which is an inexpensive and large-scale production method, has been used. Hot-rolled titanium sheets have come to be manufactured using the method (for example, Japanese Patent Publication No. 55-2126, Japanese Patent Publication No. 59-41508, Japanese Patent Application Laid-Open No. 60-33805, etc.).
この種の熱間圧延設備は通常、連続式加熱炉（ウオーキ
ングビーム式）−粗圧延機一任上圧延機一巻取り機によ
って構成されており、−ト記加熱炉での加熱温度は７０
０〜９５０℃、仕上温度は６５０〜８００℃、巻取り温
度は４５０〜６５０℃が一般的に採用されていることが
前記の特許文献に示されてｂる。This type of hot rolling equipment usually consists of a continuous heating furnace (walking beam type), a rough rolling mill, a rolling mill and a winding machine, and the heating temperature in the heating furnace is 70°C.
The above-mentioned patent document shows that 0 to 950°C, finishing temperature of 650 to 800°C, and winding temperature of 450 to 650°C are generally adopted.
そして、この様に製造され九チタン熱延板は７００℃程
度の温度で熱延板焼鈍を施こして均一に再結晶させる必
要があることが前記の特公昭５９−４１５０８号公報に
示されてｂる。It is shown in the above-mentioned Japanese Patent Publication No. 59-41508 that the hot-rolled titanium sheet produced in this manner needs to be annealed at a temperature of about 700°C to uniformly recrystallize it. bl.
（発明が解決しようとする問題点）
ところが上記熱延板焼鈍を実施するためには、加熱に要
する熱源の燃料費が多大となると共に高価な設備を必要
とすることから熱延板焼鈍を省略しうる技術の開発が要
望されていた。(Problems to be Solved by the Invention) However, in order to carry out the above-mentioned hot-rolled sheet annealing, the fuel cost for the heat source required for heating is large and expensive equipment is required, so hot-rolled sheet annealing is omitted. There was a demand for the development of technology that could do this.
本発明は、上記の要望に応えるべく種々検討の結果、完
成したものである。The present invention was completed as a result of various studies to meet the above-mentioned demands.
（問題点を解決するための手段）
本発明のチタン熱延板の製造方法は、チタンスラブを酸
化抑制雰囲気に調整した電気式加熱炉にて９５０〜１１
５０℃の温度に加熱後、熱間圧延し、このチタン熱延板
を６００〜７５０℃の温度で巻取り、再結晶を完了させ
ることを特徴とするチタン熱延板の製造方法である。(Means for Solving the Problems) The method for producing a hot-rolled titanium sheet of the present invention is to heat a titanium slab to 950 to 11
This is a method for producing a titanium hot-rolled sheet, which is characterized in that the titanium hot-rolled sheet is heated to a temperature of 50°C, then hot-rolled, and the titanium hot-rolled sheet is wound up at a temperature of 600 to 750°C to complete recrystallization.
本発明者らは前述の如く、チタン熱延板の焼鈍工程の省
略について鋭意検討を行った。その結果、若し十分に高
い巻取り温度が確保でき、且つチタンコイルの長手方向
及び幅方向で均一な温度に保てるならば、チタンのコイ
ル状態で均一に再結晶を完了させることが可能でありチ
タン熱延板焼鈍の省略が実現できるとの知見を得た。As described above, the present inventors have conducted extensive studies on omitting the annealing process for hot-rolled titanium sheets. As a result, if a sufficiently high winding temperature can be secured and the temperature can be kept uniform in the longitudinal and width directions of the titanium coil, it is possible to uniformly complete recrystallization in the titanium coil state. We have found that it is possible to omit annealing of hot-rolled titanium sheets.
チタン熱延板の巻取り温度を高める方法としては、例え
ば、仕上圧延後の冷却量をコントロールする方法、前記
特開昭６０−３３８０５号公報に示されている如く熱延
工程で加熱する方法、圧延速度を高める方法、板厚を厚
くする方法、チタンスラブの加熱温度を高める方法が考
えられる。この中で基本的に重要な方法はチタンスラブ
の加熱温度を高める方法であるが、周知の如くチタンは
、はぼ９００℃に変態点（β変態点）が存在し、この変
態点以上に通常の加熱炉で加熱すると、チタンの加熱温
度と酸化膜厚さの関係を示した第１図からも明らかなよ
うに急速に酸化が進行する結果、表面欠陥を多発するも
のである。Examples of methods for increasing the winding temperature of a hot-rolled titanium sheet include a method of controlling the amount of cooling after finish rolling, a method of heating during the hot-rolling process as shown in the above-mentioned Japanese Patent Application Laid-Open No. 60-33805, Possible methods include increasing the rolling speed, increasing the plate thickness, and increasing the heating temperature of the titanium slab. Among these, the fundamentally important method is to increase the heating temperature of the titanium slab, but as is well known, titanium has a transformation point (β transformation point) at approximately 900°C, and temperatures above this transformation point are usually As is clear from FIG. 1, which shows the relationship between the heating temperature of titanium and the oxide film thickness, when titanium is heated in a heating furnace, oxidation progresses rapidly, resulting in frequent surface defects.
この様なことから、従来のチタンスラブの加熱温度の上
限は９００℃、高くとも９５０℃才でとされており、従
来法ではチタンスラブの加熱温度の制約から、所望する
高温巻取り温度が得難いものであった。For this reason, the upper limit of the heating temperature for conventional titanium slabs is set at 900°C, or at most 950°C, and with the conventional method, it is difficult to obtain the desired high winding temperature due to the restrictions on the heating temperature of titanium slabs. It was something.
ここにおいて本発明では、従来採用されている通常の加
熱炉と異なる電気式加熱炉（銹導加熱、通電加熱等）に
着目し種々検討を加えた結果、この種の加熱炉は炉内の
雰囲気調整が極めて容易であること、その加熱方式から
スラブの表面温度が通常のガス加熱に比べて上昇しにく
いこと、等によりチタンスラブの非酸化高温加熱に極め
て適したものである。Here, in the present invention, we focused on electric heating furnaces (rust induction heating, electric current heating, etc.) that are different from conventionally employed ordinary heating furnaces, and as a result of various studies, we found that this type of heating furnace It is extremely suitable for non-oxidizing, high-temperature heating of titanium slabs because it is extremely easy to adjust, and because of its heating method, the surface temperature of the slab is less likely to rise compared to normal gas heating.
さて、チタンコイルの焼鈍例より再結晶を行わせるため
の巻取シ温度は少くとも６００℃以上が必要である。こ
れはチタンの再結晶は５００℃近傍の温度で開始するが
、安定して再結晶を行なわせるためには上記の温度が必
要である。一方巻取り温度の上限につ騒では再結晶の観
点からは特に限定する根拠はないが、チタンスラブ加熱
温度上昇の問題、すなわち■エネルギー投入量、■疵等
から上限温度を７５０℃とした。好ましくは６５０〜７
００℃である。Now, from the example of annealing a titanium coil, the winding temperature for recrystallization needs to be at least 600°C or higher. This is because recrystallization of titanium starts at a temperature of around 500° C., but the above temperature is necessary for stable recrystallization. On the other hand, there is no reason to limit the upper limit of the winding temperature from the viewpoint of recrystallization, but the upper limit temperature was set at 750° C. due to the problems of increasing the heating temperature of the titanium slab, namely (1) amount of energy input, (2) defects, etc. Preferably 650-7
It is 00℃.
次に上記巻取り温度での保持時間については、低温はど
長時間を必要とし、高温になるほど短時間でよく、大略
１分〜１８０分の範囲であるが、好ましくは５分〜６０
分である。Next, regarding the holding time at the above-mentioned winding temperature, a lower temperature requires a longer time, and a higher temperature requires a shorter time, and is approximately in the range of 1 minute to 180 minutes, but preferably 5 minutes to 60 minutes.
It's a minute.
とのさい、長手方向及び幅方向に均質な組織を得るため
には、チタンコイルに対して保温カバーを被せるとか、
加熱装置付き炉に収容するとかの補助手段を用いること
が望ましい。However, in order to obtain a homogeneous structure in the longitudinal and width directions, it is necessary to cover the titanium coil with a thermal cover.
It is desirable to use auxiliary means such as housing in a furnace with a heating device.
上記の如く規制した巻取り温度を確保するためのチタン
スラブの加熱温度は、熱間圧延条件等によっても若干異
なるが大略９５０〜１１５０℃とすべきである。この温
度範囲でチタンスラブの加熱を行なうことにより６００
〜７５０℃の巻取り温度が確保できるものである。第２
図はチタンスラブの加熱温度と巻取ル温度の関係を示し
たものである。The heating temperature of the titanium slab to ensure the coiling temperature regulated as described above should be approximately 950 to 1150°C, although it varies slightly depending on hot rolling conditions and the like. By heating the titanium slab in this temperature range,
A winding temperature of ~750°C can be ensured. Second
The figure shows the relationship between the heating temperature of the titanium slab and the winding temperature.
本発明において使用する電気式加熱炉は、可能な限りシ
ール性のすぐれた構造とするものであり、これは工業的
に容易に可能である。そして加熱中炉内へＮ ガス又は
Ｎ２ガスを主体とする不活性がスあるいはＡｒ ｔたは
Ａｒガスを主体とする不活性がスを供給して炉内の０２
ｍ度をコントロールする。このさい炉内の０２濃度は、
上記のチタンスラブ加熱温度範囲においてチタンの酸化
を効果的に抑制するために１１０００ｐｐ以下（望まし
くは５００ ｐｐｍ以下）にすることが良く、これによ
り、チタンスラブの表面硬質層（酸化物層、酸素富化層
）の生成を抑制し得て、表面品質のすぐれ九チタン熱延
板が得られるものである。The electric heating furnace used in the present invention has a structure with as good a seal as possible, and this is easily possible industrially. During heating, an inert gas mainly composed of N gas or N2 gas or an inert gas mainly composed of Ar gas or Ar gas is supplied into the furnace.
Control m degree. At this time, the 02 concentration in the furnace is
In order to effectively suppress the oxidation of titanium in the titanium slab heating temperature range mentioned above, it is recommended to reduce the titanium content to 11,000 ppm or less (preferably 500 ppm or less). This makes it possible to suppress the formation of oxidation layer) and obtain a hot-rolled titanium sheet with excellent surface quality.
（実施例）
ＪＩＳ２８１相当の純チタンスラブ（１４０■厚、単重
３〜５トン）を誘導加熱炉にて９５０〜１１５０℃に加
熱した。(Example) A pure titanium slab (140 mm thick, unit weight 3 to 5 tons) equivalent to JIS281 was heated to 950 to 1150°C in an induction heating furnace.
使用した誘導加熱炉のコイル電力け３０００ ｋＷ（６
０Ｈｚ ）であり、炉内を純度９９．９９％のＮ２がス
で／？−ノすることにより、炉内酸素濃度を５００ｐｐ
ｍに制御した。加熱彷のスラブを連続熱間圧延機を用い
て板厚４．３ ｍまで圧延接種々の温度で捲取った。本
発明例扁１およびＡ２は捲取り後保温カバーを被せた。The coil power of the induction heating furnace used was 3000 kW (6
0Hz), and 99.99% pure N2 is flowing inside the furnace. - By doing so, the oxygen concentration in the furnace is reduced to 500pp.
It was controlled to m. The heated slab was rolled up to a thickness of 4.3 m using a continuous hot rolling mill at the same rolling temperature. Inventive Examples Folders 1 and A2 were covered with a heat insulation cover after being rolled up.
冷却後の熱延板はショットプラスト処理の後、硝弗酸に
よシ酸洗し、表面肌の評価と断面のミクロ観察を行った
。After cooling, the hot-rolled sheets were subjected to shot blast treatment and pickled with nitric-fluoric acid, and the surface texture was evaluated and the cross section was microscopically observed.
本発明例Ａｌ〜５はいずれも再結晶が完了しており、表
面肌も美麗である。Recrystallization has been completed in all of Examples Al to 5 of the present invention, and the surface skin is beautiful.
これに対し比較例Ａ６〜９は、本発明の範囲外で実施し
たものであｐ１加加熱度が低いＡ６，９は再結晶が完了
しておらず、ガス加熱炉で加熱した扁８．９は表面肌性
状が悪い。On the other hand, Comparative Examples A6 to A9 were carried out outside the scope of the present invention, and recrystallization was not completed in A6 and A9, which had a low p1 heating degree, and the flat plate 8.9 was heated in a gas heating furnace. has poor surface skin condition.
（発明の効果）
以上説明１．たよりに本発明によるとチタン熱延板を熱
間圧延のままの状態で均一に再結晶を完了させうるので
、チタン熱延板焼鈍の省略が実現できると共に表面肌の
美麗なチタン材熱延製品を製造できるという優れた効果
が奏される。(Effect of the invention) Above explanation 1. Additionally, according to the present invention, it is possible to uniformly complete recrystallization of a hot-rolled titanium sheet while it is still hot-rolled, so it is possible to omit annealing of a hot-rolled titanium sheet, and to produce a hot-rolled titanium product with a beautiful surface texture. It has the excellent effect of being able to produce.
第１図はチタンの加熱温度と酸化膜厚さの関係を示す図
、第２図はチタンスラブの加熱温度と捲取温度の関係を
示す図である。FIG. 1 is a diagram showing the relationship between titanium heating temperature and oxide film thickness, and FIG. 2 is a diagram showing the relationship between titanium slab heating temperature and winding temperature.
Claims (1)
にて９５０〜１１５０℃の温度に加熱後、熱間圧延し、
このチタン熱延板を６００〜７５０℃の温度で巻取り、
再結晶を完了させることを特徴とするチタン熱延板の製
造方法。After heating the titanium slab to a temperature of 950 to 1150°C in an electric heating furnace adjusted to an oxidation-suppressing atmosphere, hot rolling it,
This titanium hot-rolled plate is wound at a temperature of 600 to 750°C,
A method for producing a hot-rolled titanium sheet, characterized by completing recrystallization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22364385A JPS6283457A (en) | 1985-10-09 | 1985-10-09 | Manufacturing of titanium hot-rolled plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22364385A JPS6283457A (en) | 1985-10-09 | 1985-10-09 | Manufacturing of titanium hot-rolled plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6283457A true JPS6283457A (en) | 1987-04-16 |
Family
ID=16801398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22364385A Pending JPS6283457A (en) | 1985-10-09 | 1985-10-09 | Manufacturing of titanium hot-rolled plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6283457A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63114952A (en) * | 1986-11-04 | 1988-05-19 | Sumitomo Metal Ind Ltd | Manufacture of titanium sheet having superior cold rollability |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5429458A (en) * | 1977-08-08 | 1979-03-05 | Huret Roger Henri | Handle of controlling speed change of bicycle |
-
1985
- 1985-10-09 JP JP22364385A patent/JPS6283457A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5429458A (en) * | 1977-08-08 | 1979-03-05 | Huret Roger Henri | Handle of controlling speed change of bicycle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63114952A (en) * | 1986-11-04 | 1988-05-19 | Sumitomo Metal Ind Ltd | Manufacture of titanium sheet having superior cold rollability |
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