JPH01107901A - Direct rolling method of steel - Google Patents
Direct rolling method of steelInfo
- Publication number
- JPH01107901A JPH01107901A JP26724887A JP26724887A JPH01107901A JP H01107901 A JPH01107901 A JP H01107901A JP 26724887 A JP26724887 A JP 26724887A JP 26724887 A JP26724887 A JP 26724887A JP H01107901 A JPH01107901 A JP H01107901A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- steel
- pass
- equation
- direct
- 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
- 238000005096 rolling process Methods 0.000 title claims abstract description 64
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 12
- 238000005266 casting Methods 0.000 claims abstract description 5
- 238000005098 hot rolling Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 16
- 239000000463 material Substances 0.000 abstract description 10
- 238000001953 recrystallisation Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012733 comparative method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Landscapes
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は鋼の直送圧延法に閤するものである。[Detailed description of the invention] (Industrial application field) The present invention is applied to a direct rolling method for steel.
（従来の技術）
靭性、溶接性等の緒特性を阻害することなく高強度の鋼
材を得るためには、金属組織を微細にすることが有効で
あることが知られている。一方で、エネルギーコスト低
減、生産性向上の意図から鋼を鋳造後冷却することな（
そのまま圧延する直送圧延法が、たとえば待閏＠５９−
２０８０１８号公報、特願昭６１−１４６０７２号等、
近年試みられている。(Prior Art) It is known that it is effective to make the metal structure fine in order to obtain a high-strength steel material without impairing its properties such as toughness and weldability. On the other hand, with the intention of reducing energy costs and improving productivity, steel is not cooled after casting (
For example, the direct rolling method in which rolling is performed as is is
Publication No. 208018, Japanese Patent Application No. 146072/1983, etc.
It has been attempted in recent years.
（発明が解決しようとする問題点）
しかし、通常このような直送圧延を行った場合には、粗
大な凝固組繊がその後の圧延により再結晶しがすこ（、
その結果最終的に得ら紅る金属組織も比較的粗大である
か、または部分的に生じる再結晶により粗大粒と細粒と
の混粒状態となってしまい、強度・靭性ともに良好なも
のを得ることは難しいという欠点があった。また無理に
再結晶を生じさせようとすれば高温での強圧下が必要と
なり、鋳造装置と圧延機の位置関係、圧延機の能力等に
大きな制約が生じるという欠点があった。(Problem to be solved by the invention) However, when such direct rolling is normally performed, the coarse solidified fibers recrystallize (,
As a result, the finally obtained red metal structure is either relatively coarse, or it becomes a mixed grain state of coarse grains and fine grains due to partially occurring recrystallization, making it difficult to obtain a material with good strength and toughness. The drawback was that it was difficult to obtain. In addition, if an attempt is made to force recrystallization, strong reduction at high temperatures is required, which has the disadvantage that there are significant restrictions on the positional relationship between the casting equipment and the rolling mill, the capacity of the rolling mill, etc.
本発明は上記のような従来の欠点を解消し、従来の圧延
機の能力で十分に凝固粗大組織を再結晶させることを可
能とした鋼の直送圧延法を提供する。The present invention eliminates the above-mentioned conventional drawbacks and provides a direct rolling method for steel that makes it possible to sufficiently recrystallize a solidified coarse structure using the capacity of a conventional rolling mill.
（問題点を解決するための手段）
本発明の要旨は、鋼をａｎ後冷却することなくそのまま
熱間圧延するに際し、計２バス以上の圧延をイテい、そ
のうちの少なくと６１バスを他のバスの圧延力向に対し
て圧延法線方向を中心に下記式で示される範囲のθ度回
転させて圧延を行う鋼の直送圧延法である。(Means for Solving the Problems) The gist of the present invention is that when hot rolling steel as it is without cooling it after rolling, at least 61 of them are rolled in two or more buses. This is a direct rolling method for steel in which rolling is performed by rotating the rolling normal direction by θ degrees in the range shown by the following formula with respect to the rolling force direction of the bus.
２２．５±９０ｎ＜θ＜ ６７．５±９０ｎ（単位；度
）ここ’ｔ’ｎは１．２、・・・の整数である。22.5±90n<θ<67.5±90n (unit: degrees) where 't'n is an integer of 1.2, .
（作用） 凝固組織は通常柱状晶と等結晶とに分けられる。(effect) Solidified structures are usually divided into columnar and equicrystalline structures.
このうち等結晶は比較的圧延によって再結晶しやすいが
、柱状晶はその寸法が大きいことすなわち再結晶粒の生
成場所となりうる単位面積当りの結晶粒界面積が小さい
ことなどから極めて再結晶しにくい、従来の直送圧延で
最後本で未再結晶状態で残るのはこの柱状晶の一部分で
ある。もし従来の直送圧延法で全ての柱状晶を再結晶さ
せようとすれば高温で強圧下をする必要が生じる。その
ため鋳造機と圧延機が近接している工場でしかも圧ｌＬ
磯の圧下能力が非常に大きい場合以外は全ての柱状晶を
再結晶させることは不可能だったのである。Among these, homocrystals are relatively easy to recrystallize by rolling, but columnar crystals are extremely difficult to recrystallize because of their large size, i.e., the small grain boundary area per unit area that can serve as a place for recrystallized grains to form. In conventional direct rolling, it is only a portion of these columnar crystals that remain unrecrystallized at the end. If all the columnar crystals were to be recrystallized using the conventional direct rolling method, it would be necessary to apply strong pressure at high temperatures. Therefore, in factories where casting machines and rolling mills are located close together,
It was impossible to recrystallize all the columnar crystals unless the rock had a very large rolling capacity.
しかるに、本発明者らは上記の限界を打破することを可
能とする新しい事実を発見し、それをもとに新たなる鋼
の直送圧延法を完成した。However, the present inventors have discovered a new fact that makes it possible to overcome the above-mentioned limitations, and based on this discovery, have completed a new direct rolling method for steel.
一般に、柱状晶はいわゆる（ｉｏｏ）面が圧延面に対し
て平行になるような原子配列となっていることが知られ
ているが、（１００）面上での結晶の向きは様々な方向
を向いている。よって、ある柱状晶については原子が圧
延力向に対して密に配列しているが、別の柱状晶につい
ては原子が圧延力向に対して祖に配列してＣする。この
ような圧延方向に沿つた原子配列の粗密は、圧延による
柱状晶の変形のされ易さと関係する。一方、圧延再結晶
挙動は圧延歪みによって誘起されるものであり、加えら
れた歪みが大きい程再結晶が生じ易い。Generally, it is known that columnar crystals have an atomic arrangement in which the so-called (ioo) plane is parallel to the rolling surface, but the orientation of the crystal on the (100) plane varies in various directions. It's suitable. Therefore, in some columnar crystals, the atoms are arranged densely in the direction of the rolling force, but in other columnar crystals, the atoms are arranged in a straight line in the direction of the rolling force. The density of the atomic arrangement along the rolling direction is related to the ease with which the columnar crystals are deformed by rolling. On the other hand, rolling recrystallization behavior is induced by rolling strain, and the greater the applied strain, the more likely recrystallization occurs.
よって、圧延によって変形されやすい原子配列をとる柱
状晶は圧延によって大きな歪みを導入されるため比較的
容易に再結晶を生じるが、圧延によって変形されにくい
原子配列をとる柱状晶は圧延によってあまり歪みが導入
されないため、再結晶を生じない、このため圧延終了後
に得られる金属組繊は粗大粒と細粒との混粒状態となり
、材質が劣化するのである。しかるにもし、様々な原子
配列の柱状晶を変形させるに適した方向と一致するよう
に各圧延バスごとに圧延方向を変化させれば、各柱状晶
はいずれかの圧延バスによって大きな圧延歪みを導入さ
れ容易に再結晶を生じる。Therefore, columnar crystals with an atomic arrangement that is easily deformed by rolling undergo recrystallization relatively easily due to the large strain introduced by rolling, whereas columnar crystals with an atomic arrangement that is difficult to deform by rolling are not so distorted by rolling. Since it is not introduced, recrystallization does not occur, and therefore, the metal composite fiber obtained after rolling is in a mixed state of coarse grains and fine grains, and the material quality deteriorates. However, if the rolling direction is changed for each rolling bath to match the direction suitable for deforming columnar crystals with various atomic arrangements, each columnar crystal will be subjected to a large rolling strain by one of the rolling buses. and easily recrystallizes.
このような新しい発見に基づき、圧延方向と柱状晶内部
の原子配列との関係が再結晶挙動に及ぼす影響を詳細に
調査した結果、従来の圧延機の能力で十分に凝固粗大ａ
ｍを再結晶させることが可能な鋼の直送圧延法を完成し
た。Based on these new discoveries, we conducted a detailed investigation into the influence of the relationship between the rolling direction and the atomic arrangement inside the columnar crystals on recrystallization behavior. As a result, we found that the ability of conventional rolling mills was sufficient to solidify coarse a
We have completed a direct rolling method for steel that can recrystallize m.
トータルの圧延バス数を２バス以上としたのは、少なく
とも１バスは他の圧延バスの圧延方向と異なる方向に圧
延する必要があるためである。The reason why the total number of rolling buses is set to two or more is that at least one bus needs to roll in a direction different from the rolling direction of the other rolling buses.
その際の圧延方向の差は、結晶学的には圧延法線方向を
軸に４５度回転させた位置が最も適しているが、それよ
り ±２２．５度程度ずれても再結晶挙動に及ぼす効果
は顕著であるため、他の圧延バスとの圧延方向の差は圧
延法線方向を袖に２２．５度から６７．５度の範囲で回
松させた方向とする。±９Ｏｎの項が含まれているのは
、対称性を−を慮すれば同様の効果が得られるためであ
る。Regarding the difference in the rolling direction at that time, from a crystallographic point of view, the most suitable position is a position rotated by 45 degrees around the rolling normal direction, but even a deviation of about ±22.5 degrees from this position will affect the recrystallization behavior. Since the effect is remarkable, the difference in rolling direction from other rolling baths is a direction in which the rolling normal direction is rotated in the range of 22.5 degrees to 67.5 degrees. The term ±9On is included because the same effect can be obtained if the symmetry is taken into consideration.
（実施例）
ｔｊＳ１表に示す成分の鋼について第２表に示す本発明
方法および比較方法を適用した結果、ｆ：ｔｓ２表に示
したような再結晶率および靭性値となり、明らかに本発
明方法により再結晶が容易に生じ、さらには靭性の向上
がもたらされでおり、本発明方法は有効である。(Example) As a result of applying the method of the present invention and the comparative method shown in Table 2 to steel having the components shown in Table tjS1, the recrystallization rate and toughness values shown in Table f:ts2 were obtained, which clearly showed that the method of the present invention The method of the present invention is effective because recrystallization easily occurs and the toughness is improved.
（発明の効果）
本発明は、溶鋼を連続ｉＪＪ遺し、その顕熱を利用して
材料加熱のためのエンルギー使用量を大きく減少させる
鋼の直送圧延プロセスにあって、通常の圧下率を適用す
る圧延によって材料の柱状晶部分をも再結晶させること
ができ、靭性に優れた均一な特性を有する鋼材を製造で
きる。(Effect of the invention) The present invention is a steel direct rolling process in which molten steel is left in a continuous iJJ and the sensible heat thereof is used to greatly reduce the amount of energy used for heating the material, and a normal rolling reduction rate is applied. Rolling can also recrystallize the columnar crystal portion of the material, making it possible to produce a steel material with excellent toughness and uniform properties.
第１図は本発明を実施する一態様を示す平面図である。 １・・・被圧延材、２・・・圧延ロール。 FIG. 1 is a plan view showing one embodiment of the present invention. 1... Material to be rolled, 2... Rolling roll.
Claims (1)
るに際し、計２バス以上の圧延を行い、そのうちの少な
くとも１バスを他のバスの圧延方向に対して圧延法線方
向を中心に下記式で示される範囲のθ度回転させて圧延
を行う鋼の直送圧延法。 ２２．５±９０ｎ＜θ＜６７．５±９０ｎ（単位；度）
ここでｎは１、２、・・・の整数である。[Scope of Claims] (1) When hot rolling steel as it is without cooling it after casting, rolling is performed in a total of two or more buses, and at least one of the buses is rolled in the rolling direction of the other buses. A direct rolling method for steel in which rolling is performed by rotating the steel by θ degrees within the range shown by the following formula around the linear direction. 22.5±90n<θ<67.5±90n (unit: degrees)
Here, n is an integer of 1, 2, .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62267248A JPH0647121B2 (en) | 1987-10-22 | 1987-10-22 | Direct steel rolling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62267248A JPH0647121B2 (en) | 1987-10-22 | 1987-10-22 | Direct steel rolling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01107901A true JPH01107901A (en) | 1989-04-25 |
| JPH0647121B2 JPH0647121B2 (en) | 1994-06-22 |
Family
ID=17442195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62267248A Expired - Lifetime JPH0647121B2 (en) | 1987-10-22 | 1987-10-22 | Direct steel rolling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0647121B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5756104A (en) * | 1980-09-20 | 1982-04-03 | Sumitomo Metal Ind Ltd | Blooming method by universal slabbing mill |
-
1987
- 1987-10-22 JP JP62267248A patent/JPH0647121B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5756104A (en) * | 1980-09-20 | 1982-04-03 | Sumitomo Metal Ind Ltd | Blooming method by universal slabbing mill |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0647121B2 (en) | 1994-06-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
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