JPS6411690B2 - - Google Patents
Info
- Publication number
- JPS6411690B2 JPS6411690B2 JP10855281A JP10855281A JPS6411690B2 JP S6411690 B2 JPS6411690 B2 JP S6411690B2 JP 10855281 A JP10855281 A JP 10855281A JP 10855281 A JP10855281 A JP 10855281A JP S6411690 B2 JPS6411690 B2 JP S6411690B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- extraction
- billet
- furnace
- steel
- 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
- 238000010438 heat treatment Methods 0.000 claims description 54
- 229910000831 Steel Inorganic materials 0.000 claims description 49
- 239000010959 steel Substances 0.000 claims description 49
- 238000000605 extraction Methods 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 12
- 239000011295 pitch Substances 0.000 description 12
- 238000004364 calculation method Methods 0.000 description 10
- 238000005096 rolling process Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 239000002436 steel type Substances 0.000 description 5
- 238000013523 data management Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000000725 suspension Substances 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
- C21D11/00—Process control or regulation for heat treatments
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Control Of Heat Treatment Processes (AREA)
Description
【発明の詳細な説明】
この発明は連続式加熱炉の温度制御方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control method for a continuous heating furnace.
従来圧延に先立つて鋼片の加熱をおこなう連続
式加熱炉において鋼片の抽出温度を制御する制御
方法としては、炉温検出値から炉内の全鋼片に対
して公知の伝熱方程式を用いてオンライン計算機
により昇温曲線を求めて昇温予測をおこない、こ
れにもとずいて鋼片抽出温度を所定温度とするよ
う炉内各帯の炉温を修正する方法が採用されてき
た。しかしながら、炉温の制御だけで鋼片の抽出
温度を制御することは実際の操業上は不可能であ
る。たとえば圧延機の故障などにより加熱炉から
の鋼片の抽出を停止させた場合、在炉中の鋼片が
温度上昇するため、運転再開時には鋼片の過熱防
止のため抽出ピツチ（時間）を圧延能力限界値ま
で短縮して操業する必要がある。（第１図参照）
ところが抽出ピツチを短縮した状態のままでは、
運転再開後新たに加熱帯に装入された鋼片は在炉
時間が短いまま抽出されるので、第１図中Ｂ点に
示すように抽出温度が抽出目標温度より下まわる
現象を生じ、抽出を停止しないと圧延機に負荷が
かかり圧延機の故障や圧延製品の不良発生などの
悪影響を生じる。そこで抽出を一時停止するいわ
ゆる加熱待ちをおこなうのであるが、その後抽出
を再開すると再び抽出温度が一旦抽出目標温度を
かなり上まわり、次いで抽出温度の降下を生じ、
以下同様にして抽出温度が発振状態を続ける。こ
のため第１図に斜線で示す温度分に対応する燃料
の損失、生産量低減および設備休転による損失な
どをひきおこしている。 Conventionally, as a control method for controlling the extraction temperature of a steel billet in a continuous heating furnace that heats the billet prior to rolling, a known heat transfer equation is used for all the billets in the furnace based on the detected value of the furnace temperature. A method has been adopted in which a temperature rise curve is calculated using an online computer to predict the temperature rise, and based on this, the furnace temperature of each zone in the furnace is corrected so that the billet extraction temperature is a predetermined temperature. However, in actual operation, it is impossible to control the extraction temperature of the steel billet only by controlling the furnace temperature. For example, if the extraction of steel billets from the heating furnace is stopped due to a malfunction in the rolling mill, the temperature of the steel billets in the furnace will rise. It is necessary to operate at reduced capacity to the maximum capacity. (See Figure 1)
However, if the extraction pitch remains shortened,
Since the steel slabs newly charged into the heating zone after restarting operation are extracted while their in-furnace time is short, a phenomenon occurs in which the extraction temperature falls below the extraction target temperature, as shown at point B in Figure 1, and the extraction If the rolling mill is not stopped, a load will be placed on the rolling mill, resulting in adverse effects such as malfunction of the rolling mill and defects in rolled products. Therefore, the extraction is temporarily stopped, which is called waiting for heating, but when the extraction is restarted, the extraction temperature once again exceeds the extraction target temperature, and then the extraction temperature drops.
Thereafter, the extraction temperature continues to oscillate in the same manner. This causes a loss of fuel, a reduction in production volume, a loss due to equipment stoppage, etc. corresponding to the temperature indicated by diagonal lines in FIG.
この発明は上記の点にかんがみてなされたもの
で、鋼片抽出温度を精度よく制御でき、燃料原単
位および生産性の向上をはかることができる加熱
炉の制御方法を提供しようとするものである。 This invention has been made in view of the above points, and aims to provide a heating furnace control method that can accurately control the steel billet extraction temperature and improve fuel consumption and productivity. .
しかしてこの発明は、鋼片の加熱をおこなう連
続式加熱炉において、装入口から装入された所定
の対象鋼片の加熱帯入口における鋼片推定温度を
算出し、鋼片の昇温管理曲線に応じて予め定めた
上記加熱帯入口における鋼片管理温度と上記鋼片
推定温度とを比較し、その偏差に応じて上記加熱
炉の鋼片抽出ピツチの修正をおこなうことを特徴
とする連続式加熱炉の制御方法である。 However, this invention calculates the estimated temperature of the steel billet at the heating zone inlet of a predetermined target steel billet charged from the charging port in a continuous heating furnace that heats the billet, and calculates the temperature rise control curve of the steel billet. A continuous method characterized in that the steel billet control temperature at the entrance of the heating zone, which is determined in advance according to This is a method of controlling a heating furnace.
この発明において、鋼片の昇温管理曲線とは、
鋼片の進行に伴う加熱炉内各位置における鋼片温
度を示す昇温曲線のうち、たとえば加熱炉のバー
ナを燃焼効率最高点で燃焼させた状態で所望の抽
出温度を得る等の所望の目的をもつて選定した昇
温曲線をいう。また鋼片管理温度とは前記昇温管
理曲線上の鋼片温度をいう。 In this invention, the temperature increase control curve of the steel billet is
Among the temperature rise curves that show the temperature of the steel billet at each position in the heating furnace as the billet progresses, the desired purpose, such as obtaining a desired extraction temperature with the burner of the heating furnace burning at the highest combustion efficiency point. This refers to the temperature rise curve selected using Moreover, the steel billet control temperature refers to the steel billet temperature on the temperature increase control curve.
この発明においては、加熱炉の加熱帯入口にお
ける鋼片推定温度と加熱帯入口における鋼片管理
温度との偏差に応じて加熱炉の抽出ピツチ設定値
の修正をおこなうが、これは一般に多量の熱量の
投入がおこなわれるのは加熱帯であり、この加熱
帯内の通過時間が抽出温度に大きな影響をもつこ
とに着目して発明者が実験により得た知見に基づ
くものである。 In this invention, the extraction pitch setting value of the heating furnace is corrected according to the deviation between the estimated steel billet temperature at the heating zone entrance of the heating furnace and the steel billet control temperature at the heating zone entrance, but this generally requires a large amount of heat. The invention is based on the findings obtained through experiments by the inventors, noting that the injection is carried out in a heating zone, and that the passage time within this heating zone has a large effect on the extraction temperature.
以下第２図乃至第４図によりこの発明を３帯式
加熱炉に適用した実施例について説明する。 An embodiment in which the present invention is applied to a three-zone heating furnace will be described below with reference to FIGS. 2 to 4.
図中１は加熱炉で、予熱帯２、加熱帯３、均熱
帯４を有している。５は炉温制御装置で、炉温調
節計等をそなえた公知の構成のもので、加熱帯３
および均熱帯４のバーナの燃焼量を調節して各帯
の炉温を設定値に維持する。６ａ〜６ｄは炉温検
出器、７は鋼片搬送装置に連動して鋼片の炉内位
置推定用の信号を発するパルスゼネレータから成
る位置検出器、８は鋼片の鋼種およびサイズのデ
ータ打込用のタイプライタ、９は操業データ管理
装置である。また１０は鋼片温度演算回路、１１
は管理曲線選定回路、１２はこれら両回路の出力
を比較して偏差値信号を発する比較器、１３は比
較器、１４は入力信号に定数ｋを乗ずる乗算器、
１５は加算器である。１６は加熱炉１から鋼片を
抽出するたとえばエキストラクタなどの抽出機、
１７はこのエキストラクタの運転を制御する抽出
制御装置である。 In the figure, 1 is a heating furnace, which has a pre-heating zone 2, a heating zone 3, and a soaking zone 4. Reference numeral 5 denotes a furnace temperature control device, which is of a known configuration and equipped with a furnace temperature controller, etc.
The combustion amount of the burner in the soaking zone 4 is adjusted to maintain the furnace temperature in each zone at the set value. Numerals 6a to 6d are furnace temperature detectors, 7 is a position detector consisting of a pulse generator that is linked to the billet transport device and generates a signal for estimating the position of the billet in the furnace, and 8 is a data input device for the steel type and size of the billet. 9 is an operational data management device. Further, 10 is a steel billet temperature calculation circuit, 11
12 is a comparator that compares the outputs of these two circuits and generates a deviation value signal; 13 is a comparator; 14 is a multiplier that multiplies the input signal by a constant k;
15 is an adder. 16 is an extractor such as an extractor for extracting steel pieces from the heating furnace 1;
17 is an extraction control device that controls the operation of this extractor.
次に上記装置を用いたこの発明の制御手順を説
明すると、先ず加熱帯３の入口Ａにおける鋼片の
管理温度TAを次のようにして定める。（以下第３
図参照）すなわち、加熱帯３および均熱帯４のバ
ーナを該バーナの燃焼効率最高点で燃焼させた投
入熱量のもとで、加熱炉１に続く圧延設備の圧延
能力から決まる目標抽出温度（中心温度）Tfが
得られる鋼片の昇温曲線を、鋼片の各鋼種および
サイズに対して求め、これを昇温管理曲線Ｔとす
る。第３図はその一例を示す。なお本実施例では
鋼片の中心温度Tfおよび表面温度との温度偏差
△Tfにより抽出温度を規定した。上述の昇温管
理曲線はオフラインにおいて計算機により公知の
伝熱計算をおこなつて求める。この昇温管理曲線
Ｔ上において、加熱帯の入口Ａに対応する温度を
管理温度TAとし、抽出温度の許容差に対応して
定めた管理温度TAの許容差を△TAとする。この
ようにして定めた各鋼種およびサイズに対する管
理温度TAおよび許容差△TAを管理曲線選定回路
１１に記憶させておく。 Next, the control procedure of the present invention using the above device will be explained. First, the control temperature T A of the steel slab at the entrance A of the heating zone 3 is determined as follows. (Hereafter, the third
In other words, the target extraction temperature (center The temperature increase curve of the steel billet from which T f (temperature) is obtained is determined for each steel type and size of the steel billet, and this is designated as the temperature increase control curve T. FIG. 3 shows an example. In this example, the extraction temperature was defined by the temperature deviation ΔT f between the center temperature T f of the steel billet and the surface temperature. The temperature increase control curve described above is obtained by performing a known heat transfer calculation off-line using a computer. On this temperature increase control curve T, the temperature corresponding to the inlet A of the heating zone is defined as control temperature T A , and the tolerance of control temperature T A determined corresponding to the tolerance of extraction temperature is defined as ΔT A. The control temperature T A and tolerance ΔT A for each steel type and size thus determined are stored in the control curve selection circuit 11.
さて加熱炉１の操業は、炉温制御装置５の炉温
調節計を作業者がバーナ燃焼効率最高点に対応す
る温度に手動で設定しておこなう。操業中、炉温
検出器６ａ〜６ｄによる炉温実測値、位置検出器
７による鋼片位置信号、およびタイプライタ８に
よる鋼種およびサイズ信号を操業データ管理装置
９に与えておく。所定の対象鋼片（本実施例では
５本おきの鋼片）W1，W2，W3，…について、
該対象鋼片が装入口から炉に装入された時点以
後、適宜のサイクル（たとえば１分おき）をもつ
て鋼片温度演算回路１０により鋼片の推定温度を
算出する。この演算はオンラインにおいて公知の
伝熱式を用いておこない、対象鋼片が加熱帯３の
入口Ａに達した時点において該入口における対象
鋼片の推定温度tAを比較器１２に出力する。一方
操業データ管理装置９内の鋼種およびサイズのデ
ータと鋼片位置データとを用いて管理曲線選定回
路１１は対象鋼片が加熱帯の入口Ａに達した時点
において、内部に記憶した管理温度TA、および
許容偏差△TAを出力し、比較器１２はこの管理
温度TAと鋼片温度演算回路１０の発する鋼片推
定温度tAとを比較してその温度偏差信号△tAを比
較器１３に与える。比較器１３により、この温度
偏差△tAと許容偏差△TAとの比較をおこない、
△tAが△TAより大である場合のみ、温度偏差△tA
を乗算器１４に与え、この乗算器と加算器１５と
により、抽出制御装置１７に記憶されているタイ
マのセツト時間である抽出ピツチP1（秒）に下記
演算を施し、新たな抽出ピツチP2（秒）として抽
出制御装置１７に与える。 Now, the heating furnace 1 is operated by an operator manually setting the furnace temperature controller of the furnace temperature control device 5 to a temperature corresponding to the maximum burner combustion efficiency. During operation, actual furnace temperature measurements from the furnace temperature detectors 6a to 6d, billet position signals from the position detector 7, and steel type and size signals from the typewriter 8 are provided to the operation data management device 9. Regarding the predetermined target steel pieces (every fifth steel piece in this example) W 1 , W 2 , W 3 ,...
After the target steel billet is charged into the furnace from the charging port, the estimated temperature of the steel billet is calculated by the billet temperature calculation circuit 10 at appropriate cycles (for example, every minute). This calculation is performed online using a known heat transfer equation, and when the target steel piece reaches the inlet A of the heating zone 3, the estimated temperature tA of the target steel piece at the entrance is output to the comparator 12. On the other hand, using the steel type and size data and billet position data in the operation data management device 9, the control curve selection circuit 11 selects the internally stored control temperature T when the target billet reaches the inlet A of the heating zone. A , and the allowable deviation △T A are output, and the comparator 12 compares this control temperature T A with the estimated steel billet temperature t A generated by the billet temperature calculation circuit 10 and compares the temperature deviation signal △t A. Give to container 13. The comparator 13 compares this temperature deviation △t A with the allowable deviation △T A.
Temperature deviation △t A if and only if △t A is greater than △T A
is applied to the multiplier 14, and the multiplier and adder 15 perform the following calculation on the extraction pitch P 1 (seconds), which is the set time of the timer stored in the extraction control device 17, to obtain a new extraction pitch P. 2 (seconds) to the extraction control device 17.
P2＝P1＋ｋ△TA ……(1)
なお上式におけるｋ（乗算器１４の定数）は、
実験により求めたゲインである。また対象鋼片の
加熱帯の入口Ａにおける温度偏差△tAが許容偏差
△TA以下であれば、抽出ピツチ設定値を変更す
る必要はないので比較器１３は出力信号を発せ
ず、上記演算はおこなわない。このようにして新
たな抽出ピツチP2が抽出制御装置１７に与えら
れると、作業者に対する抽出機操作指令ブザーは
新たな抽出ピツチで吹鳴されるので、作業者はこ
の指令を聞いて抽出機の運転をおこなえばよい。
後続の対象鋼片についても以下同様にして抽出ピ
ツチの修正をおこなう。これにより各鋼片は所望
の抽出温度に加熱されて加熱炉から圧延ラインへ
と供給される。 P 2 = P 1 + k△T A ...(1) In the above equation, k (the constant of the multiplier 14) is
This is the gain obtained through experiment. Furthermore, if the temperature deviation △t A at the entrance A of the heating zone of the target steel piece is less than the allowable deviation △T A , there is no need to change the extraction pitch set value, so the comparator 13 does not issue an output signal, and the above calculation is performed. is not performed. When the new extraction pitch P 2 is given to the extraction control device 17 in this way, the extractor operation command buzzer for the operator is sounded at the new extraction pitch, so the operator hears this command and operates the extractor. All you have to do is drive.
The extraction pitch is corrected in the same manner for subsequent target steel pieces. Thereby, each steel billet is heated to a desired extraction temperature and supplied from the heating furnace to the rolling line.
なお上記において抽出ピツチP1，P2，…によ
り作業者を介在させずに直接抽出機を自動運転さ
せるようにしてもよい。 In the above, the extraction pitches P 1 , P 2 , . . . may directly operate the extraction machine automatically without the intervention of an operator.
第４図は炉長25mの３帯式加熱炉を用い、上記
制御方法（但しｋ＝１）により鋼片（148mm×148
mm×12m）の加熱をおこなつた例を示す。休転に
続く運転再開後の鋼片抽出温度は速やかに抽出目
標温度に収束し、温度待ちの必要性および抽出温
度の発振現象は生じなかつた。第１図も本実施例
と同一炉および同一鋼片を用いたものであるの
で、比較すれば本発明による顕著な効果が理解さ
れる。 Figure 4 shows a steel billet (148 mm x 148
An example of heating the area (mm x 12m) is shown below. After the restart of operation following suspension, the extraction temperature of the steel billet quickly converged to the extraction target temperature, and there was no need to wait for the temperature or an oscillation phenomenon in the extraction temperature. Since FIG. 1 also uses the same furnace and the same steel billet as the present example, a comparison will show the remarkable effects of the present invention.
なお上記実施例において抽出ピツチの修正は非
線形演算式など、(1)式以外の式によつてもよい。
また比較器１３を取除いて各対象鋼片に対して必
ず抽出ピツチの修正をおこなうようにしてもよ
い。 Note that in the above embodiment, the extraction pitch may be corrected by an expression other than expression (1), such as a nonlinear calculation expression.
Alternatively, the comparator 13 may be removed to ensure that the extraction pitch is corrected for each target steel piece.
また上記実施例において鋼片の昇温管理曲線と
して、バーナの最高燃焼効率点における燃焼とい
う条件のかわりに、鋼片昇温曲線のうち時間積分
値が最も小となる曲線を選定すれば、加熱炉への
投入燃料および加熱炉からの損失熱量が最小とな
り、一層燃料原単位の向上をはかることができ、
さらに鋼片がその材質等により特別の昇温曲線に
沿つた加熱履歴を必要とする場合などは、該昇温
曲線を昇温管理曲線として選定すればよい。 Furthermore, in the above embodiment, instead of the condition of combustion at the maximum combustion efficiency point of the burner as the temperature rise control curve of the steel billet, if the curve with the smallest time integral value is selected from the steel billet temperature rise curve, the heating The fuel input to the furnace and the amount of heat lost from the heating furnace are minimized, making it possible to further improve the fuel consumption rate.
Furthermore, if the steel billet requires a heating history along a special temperature increase curve due to its material, etc., the temperature increase curve may be selected as the temperature increase control curve.
以上はこの発明を単一の加熱帯をそなえた加熱
炉に適用した場合について説明したが、この発明
は複数帯の加熱帯をそなえた加熱炉にも適用でき
るものである。この場合は各加熱帯、あるいは加
熱の主体をなす加熱帯等の特定の加熱帯に対し
て、本発明方法を適用すればよい。また炉温の制
御と本発明方法を併用すれば、さらに精度のよい
抽出温度の制御をおこなうことができる。 Although the present invention has been described above in a case where it is applied to a heating furnace equipped with a single heating zone, the present invention can also be applied to a heating furnace equipped with a plurality of heating zones. In this case, the method of the present invention may be applied to each heating zone or to a specific heating zone such as the heating zone that mainly performs heating. Moreover, if the method of the present invention is used in combination with the control of the furnace temperature, the extraction temperature can be controlled with even higher precision.
以上説明したようにこの発明によれば、加熱帯
入口における対象鋼片の推定温度を算出し、加熱
帯入口における鋼片管理温度と前記推定温度との
偏差に応じて加熱炉の鋼片抽出ピツチの修正をお
こなうので、マイクロコンピユータ等を使用した
短時間のオンライン演算により鋼片の抽出温度を
抽出目標温度に精度よく維持することができ、鋼
片の加熱待ちや過剰加熱が一掃されて燃料原単位
の向上と圧延設備を含めた生産性の向上をはかる
ことができる。 As explained above, according to the present invention, the estimated temperature of the target steel billet at the heating zone entrance is calculated, and the steel billet extraction pitch of the heating furnace is adjusted according to the deviation between the billet control temperature at the heating zone entrance and the estimated temperature. The extraction temperature of the steel billet can be accurately maintained at the extraction target temperature by short-time online calculation using a microcomputer, etc., and the waiting time and excessive heating of the steel billet are eliminated, and the fuel source is reduced. It is possible to improve productivity, including improvements in units and rolling equipment.
第１図は従来の制御方法による鋼片の抽出温度
線図、第２図はこの発明を適用した連続式加熱炉
の制御装置の一例を示すブロツク線図、第３図は
第２図の制御装置において用いる鋼片の昇温管理
曲線を示す線図、第４図はこの発明方法による鋼
片の抽出温度線図の一例である。
１…加熱炉、３…加熱帯、６ａ〜６ｄ…炉温検
出器、７…位置検出器、８…タイプライタ、９…
操業データ管理装置、１０…鋼片温度演算回路、
１１…管理曲線選定回路、１２…比較器、１４…
乗算器、１５…加算器、１７…抽出制御装置。
Fig. 1 is an extraction temperature diagram of a steel billet according to a conventional control method, Fig. 2 is a block diagram showing an example of a control device for a continuous heating furnace to which the present invention is applied, and Fig. 3 is a control diagram of the control method shown in Fig. 2. FIG. 4 is a diagram showing a temperature increase control curve for a steel billet used in the apparatus, and is an example of an extraction temperature diagram for a steel billet according to the method of the present invention. DESCRIPTION OF SYMBOLS 1... Heating furnace, 3... Heating zone, 6a-6d... Furnace temperature detector, 7... Position detector, 8... Typewriter, 9...
Operation data management device, 10... Slab temperature calculation circuit,
11... Management curve selection circuit, 12... Comparator, 14...
Multiplier, 15... Adder, 17... Extraction control device.
Claims (1)
て、装入口から装入された所定の対象鋼片の加熱
帯入口における鋼片推定温度を算出し、鋼片の昇
温管理曲線に応じて予め定めた上記加熱帯入口に
おける鋼片管理温度と上記鋼片推定温度とを比較
し、その偏差に応じて上記加熱炉の鋼片抽出ピツ
チの修正をおこなうことを特徴とする連続式加熱
炉の制御方法。1. In a continuous heating furnace that heats steel billets, calculate the estimated temperature of a given target steel billet at the heating zone inlet charged from the charging port, and set it in advance according to the temperature rise control curve of the steel billet. A control method for a continuous heating furnace, characterized in that the billet control temperature at the entrance of the heating zone is compared with the billet estimated temperature, and the billet extraction pitch of the heating furnace is corrected according to the deviation. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10855281A JPS589931A (en) | 1981-07-10 | 1981-07-10 | Controlling method for continuous heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10855281A JPS589931A (en) | 1981-07-10 | 1981-07-10 | Controlling method for continuous heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS589931A JPS589931A (en) | 1983-01-20 |
| JPS6411690B2 true JPS6411690B2 (en) | 1989-02-27 |
Family
ID=14487722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10855281A Granted JPS589931A (en) | 1981-07-10 | 1981-07-10 | Controlling method for continuous heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS589931A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4650723B2 (en) * | 2005-03-28 | 2011-03-16 | 住友金属工業株式会社 | Heat treatment method and quality control method for steel pipe as heat treated material |
-
1981
- 1981-07-10 JP JP10855281A patent/JPS589931A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS589931A (en) | 1983-01-20 |
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