JPS6254374B2 - - Google Patents
Info
- Publication number
- JPS6254374B2 JPS6254374B2 JP57128894A JP12889482A JPS6254374B2 JP S6254374 B2 JPS6254374 B2 JP S6254374B2 JP 57128894 A JP57128894 A JP 57128894A JP 12889482 A JP12889482 A JP 12889482A JP S6254374 B2 JPS6254374 B2 JP S6254374B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- steel strip
- roll
- cooling medium
- rolls
- 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
- 238000001816 cooling Methods 0.000 claims description 56
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 239000002826 coolant Substances 0.000 claims description 18
- 238000009835 boiling Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
Description
【発明の詳細な説明】
この発明は連続焼鈍炉における鋼帯冷却方法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cooling steel strip in a continuous annealing furnace.
連続焼鈍炉における鋼帯冷却法としはガスジエ
ツトによるものや、水冷によるもの等種々のもの
があるが、深絞り用冷延鋼板などの場合には鋼帯
を冷却ロールに接触させて急冷するロール冷却法
が提案、実施されている。 There are various ways to cool the steel strip in a continuous annealing furnace, such as by gas jet or water cooling, but in the case of cold-rolled steel sheets for deep drawing, etc., roll cooling is used to rapidly cool the steel strip by bringing it into contact with a cooling roll. Laws are proposed and implemented.
この冷却ロールはその内部に冷却媒体を循環さ
せ得る水冷ジヤケツトが内蔵されており、冷却媒
体によりロール体を冷却するように構成されてい
る。この冷却媒体としては従来は水が使われてお
り、この水は鋼帯及びロールからの吸熱により60
℃前後となつて循環している。そして冷却ロール
の表面もほぼこの循環水温度と同温度に維持され
ている。 This cooling roll has a built-in water cooling jacket capable of circulating a cooling medium therein, and is configured to cool the roll body with the cooling medium. Conventionally, water has been used as this cooling medium, and this water absorbs heat from the steel strip and rolls, causing
It circulates around ℃. The surface of the cooling roll is also maintained at approximately the same temperature as the circulating water.
しかし、このような冷却ロールによる冷却法の
場合、鋼帯温度は850℃〜700℃程度あるため、こ
のような高温の鋼帯をロールに接触させて急冷す
ると鋼帯の絞りが生ずるなど鋼帯の形状が悪くな
る欠点がある。これを防止するために、従来は冷
却ロール帯前にガスジエツト冷却帯を設けて予め
鋼帯を600℃程度まで冷却した後に冷却する方法
がとられていた。 However, in this cooling method using cooling rolls, the steel strip temperature is around 850°C to 700°C, so if such a high-temperature steel strip is brought into contact with the rolls and rapidly cooled, the steel strip may shrink, causing the steel strip to deteriorate. The disadvantage is that the shape of the In order to prevent this, conventionally a method has been used in which a gas jet cooling zone is provided in front of the cooling roll strip to cool the steel strip in advance to about 600° C. and then cool it.
しかし、このようなガスジエツト冷却の冷却速
度は５℃／sec〜40℃／secと遅いため焼入効果が
不十分になる欠点があり、またガスジエツト冷却
帯の設備が大きくなることや電力原単位が高いガ
スジエツト用大容量フアンの運転が必要である等
の欠点があつた。 However, the cooling rate of such gas jet cooling is slow at 5°C/sec to 40°C/sec, which has the disadvantage that the quenching effect is insufficient, and the equipment for the gas jet cooling zone becomes larger and the power consumption rate decreases. There were drawbacks such as the need to operate a large capacity fan for high gas jets.
本発明は上記した従来の冷却方法の欠点を改善
するためになされたもので、冷却ロールの冷却媒
体として沸点が200℃以上の高沸点冷却媒体をロ
ール内外で循環させ、且つロール外で冷却媒体を
所要温度に調整して用いることにより鋼帯の冷却
速度を制御するようにしたものであり、これによ
り鋼帯の形状悪化を防止しつつ速い冷却速度を得
ることができる。 The present invention was made in order to improve the drawbacks of the conventional cooling method described above, and it involves circulating a high boiling point cooling medium with a boiling point of 200°C or more as a cooling medium in the cooling roll inside and outside the roll, and cooling medium outside the roll. The cooling rate of the steel strip is controlled by adjusting the temperature to a required temperature, thereby making it possible to obtain a high cooling rate while preventing deterioration of the shape of the steel strip.
図面は本発明方法の説明図であり、１は加熱
帯、２は均熱帯、３は冷却帯、４は過時効帯であ
る。 The drawings are explanatory diagrams of the method of the present invention, and 1 is a heating zone, 2 is a soaking zone, 3 is a cooling zone, and 4 is an overaging zone.
冷却帯３には複数の冷却ロール１０が設けられ
ており、ここには沸点の高い冷却媒体を加熱循環
させてある。この高沸点冷却媒体は、冷却ロール
の内外で循環せしめられ、且つロール外で所要温
度に調整して用いられ、これにより鋼帯の冷却速
度が制御される。１１は循環用のポンプ、１２は
冷却媒体加熱槽、１３はヒータ、１４は冷却用の
冷却パイプである。 A plurality of cooling rolls 10 are provided in the cooling zone 3, and a cooling medium having a high boiling point is heated and circulated there. This high boiling point cooling medium is circulated inside and outside the cooling roll, and is adjusted to a desired temperature outside the roll, thereby controlling the cooling rate of the steel strip. 11 is a pump for circulation, 12 is a cooling medium heating tank, 13 is a heater, and 14 is a cooling pipe for cooling.
冷却媒体としては200℃以上の沸点を有するも
のが用いられる。具体的にはポリビニールピロリ
ド、ポリアルキレングリコール、ポリソープ或は
硝酸ナトリウムや硝酸カリウム等の塩浴が使用可
能である。 As the cooling medium, one having a boiling point of 200°C or higher is used. Specifically, polyvinyl pyrrolide, polyalkylene glycol, polysoap, or a salt bath such as sodium nitrate or potassium nitrate can be used.
この冷却媒体をヒータ１３と冷却パイプ１４に
より所定の温度に維持してポンプ１１により冷却
ロール１０内外で循環させれば冷却ロール１０の
表面を所定の温度に維持することが出来る。特に
従来の冷却水では出来なかつた100℃以上の高温
に冷却ロール１０の表面を維持することができる
からガスジエツト帯を用いることなく20℃／sec
〜150℃／secの高い冷却速度で鋼帯を予備冷却す
ることができる。 If this cooling medium is maintained at a predetermined temperature by the heater 13 and cooling pipe 14 and circulated inside and outside the cooling roll 10 by the pump 11, the surface of the cooling roll 10 can be maintained at a predetermined temperature. In particular, it is possible to maintain the surface of the cooling roll 10 at a high temperature of 100°C or more, which could not be achieved with conventional cooling water, so the cooling rate can be reduced to 20°C/sec without using a gas jet zone.
The steel strip can be precooled at a high cooling rate of ~150°C/sec.
なお、この図に示す例では冷却ロール１０の後
段に従来の水を冷却媒体とした複数の冷却ロール
２０を設置し、冷却ロール１０により予備冷却を
行い冷却ロール２０により最終冷却を行うように
構成している。 In the example shown in this figure, a plurality of cooling rolls 20 using conventional water as a cooling medium are installed downstream of the cooling roll 10, and the configuration is such that the cooling roll 10 performs preliminary cooling and the cooling roll 20 performs final cooling. are doing.
また総ての冷却ロール１０に高沸点の冷却ロー
ルを用いることも可能であるし、各冷却ロール毎
或は冷却ロール群毎に冷却媒体の温度或は冷却媒
体そのものを変える等の方法も可能である。 It is also possible to use high-boiling point cooling rolls for all the cooling rolls 10, or it is also possible to change the temperature of the cooling medium or the cooling medium itself for each cooling roll or for each cooling roll group. be.
なお予備冷却を行う場合には冷却ロール１０の
表面温度は300〜500℃程度にするのが望ましい。 In addition, when preliminary cooling is performed, it is desirable that the surface temperature of the cooling roll 10 is about 300 to 500°C.
以上説明したように本発明方法によれば、冷却
ロールの表面温度を任意の温度にコントロールす
ることができるから、鋼帯の冷却速度を自由に制
御することが可能となる。そのためガスジエツト
帯設備が不要であり、鋼帯の形状不良の発生等も
防止することが可能となる。また、連続焼鈍にお
ける各種熱サイクル、熱容量の変更、変化に対応
し、冷却ロールの表面温度を広い範囲で迅速にコ
ントロールすることができる。さらに冷却速度の
速い予備冷却が行えるから焼入れ効果が減ずるこ
とがない等の効果がある。 As explained above, according to the method of the present invention, since the surface temperature of the cooling roll can be controlled to an arbitrary temperature, it becomes possible to freely control the cooling rate of the steel strip. Therefore, there is no need for gas jet strip equipment, and it is possible to prevent the occurrence of defects in the shape of the steel strip. In addition, the surface temperature of the cooling roll can be rapidly controlled over a wide range in response to various heat cycles and changes in heat capacity during continuous annealing. Furthermore, since preliminary cooling can be performed at a high cooling rate, the quenching effect is not reduced.
図面は本発明方法の説明図である。
図中、１０は冷却ロール、１１はポンプ、１２
は冷却媒体加熱槽、１３はヒータ、１４は冷却パ
イプ、２０は冷却ロールを各示す。
The drawings are explanatory diagrams of the method of the present invention. In the figure, 10 is a cooling roll, 11 is a pump, 12
13 represents a cooling medium heating tank, 13 represents a heater, 14 represents a cooling pipe, and 20 represents a cooling roll.
Claims (1)
せて冷却する連続焼鈍炉における鋼帯冷却方法に
おいて、冷却ロールの冷却媒体として沸点が200
℃以上の高沸点冷却媒体をロール内外で循環さ
せ、且つロール外で冷却媒体を所要温度に調整し
て用いることにより鋼帯の冷却速度を制御するこ
とを特徴とする連続焼鈍炉における鋼帯冷却方
法。1 In a steel strip cooling method in a continuous annealing furnace in which the steel strip is heated and soaked and then cooled by contacting it with a cooling roll, a boiling point of 200% is used as the cooling medium for the cooling roll.
Steel strip cooling in a continuous annealing furnace, characterized in that the cooling rate of the steel strip is controlled by circulating a high boiling point cooling medium of ℃ or higher inside and outside the rolls, and adjusting the cooling medium to a required temperature outside the rolls. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12889482A JPS5920429A (en) | 1982-07-26 | 1982-07-26 | Cooling method of steel strip in continuous annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12889482A JPS5920429A (en) | 1982-07-26 | 1982-07-26 | Cooling method of steel strip in continuous annealing furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5920429A JPS5920429A (en) | 1984-02-02 |
| JPS6254374B2 true JPS6254374B2 (en) | 1987-11-14 |
Family
ID=14995973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12889482A Granted JPS5920429A (en) | 1982-07-26 | 1982-07-26 | Cooling method of steel strip in continuous annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5920429A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60221533A (en) * | 1984-04-17 | 1985-11-06 | Mitsubishi Heavy Ind Ltd | Device for cooling metallic strip |
| JPS62290832A (en) * | 1986-06-11 | 1987-12-17 | Mitsubishi Heavy Ind Ltd | Method for heating and cooling metallic strip |
| JP5616814B2 (en) * | 2011-02-16 | 2014-10-29 | 日新製鋼株式会社 | Cooling roll device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51104417A (en) * | 1975-03-12 | 1976-09-16 | Nippon Steel Corp | RENZOKU SHODONHO |
| JPS5723036A (en) * | 1980-07-18 | 1982-02-06 | Mitsubishi Heavy Ind Ltd | Method for cooling steel plate |
| JPS5732334A (en) * | 1980-07-31 | 1982-02-22 | Nippon Steel Corp | Continuous heat treatment furnace for metallic strip |
| JPS57164933A (en) * | 1981-04-01 | 1982-10-09 | Mitsubishi Heavy Ind Ltd | Cooling method for metallic strip and cooling roll used for this method |
-
1982
- 1982-07-26 JP JP12889482A patent/JPS5920429A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51104417A (en) * | 1975-03-12 | 1976-09-16 | Nippon Steel Corp | RENZOKU SHODONHO |
| JPS5723036A (en) * | 1980-07-18 | 1982-02-06 | Mitsubishi Heavy Ind Ltd | Method for cooling steel plate |
| JPS5732334A (en) * | 1980-07-31 | 1982-02-22 | Nippon Steel Corp | Continuous heat treatment furnace for metallic strip |
| JPS57164933A (en) * | 1981-04-01 | 1982-10-09 | Mitsubishi Heavy Ind Ltd | Cooling method for metallic strip and cooling roll used for this method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5920429A (en) | 1984-02-02 |
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