JPS60125329A - Production of hot rolled steel strip - Google Patents
Production of hot rolled steel stripInfo
- Publication number
- JPS60125329A JPS60125329A JP22986183A JP22986183A JPS60125329A JP S60125329 A JPS60125329 A JP S60125329A JP 22986183 A JP22986183 A JP 22986183A JP 22986183 A JP22986183 A JP 22986183A JP S60125329 A JPS60125329 A JP S60125329A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- cover
- hot rolled
- rolled steel
- steel strip
- 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
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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/84—Controlled slow cooling
-
- 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
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0025—Supports; Baskets; Containers; Covers
-
- 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
Abstract
Description
【発明の詳細な説明】
技術分野
熱間圧延鋼帯の製造方法に関しで、この明細書で述べる
技術内容は、コイル保有熱量の有効利用による自己焼鈍
をもってする材質の均一化、８次°スケールの抑制など
への適合によシ、有利に熱間圧延鋼帯を得ることについ
ての開発成果を提案するものである。[Detailed Description of the Invention] Technical Field The technical content described in this specification is related to a method for producing hot rolled steel strips, and the technical content described in this specification is to homogenize the material through self-annealing by effectively utilizing the heat retained in the coil, and to improve the quality of the material on an 8th degree scale. This paper proposes development results for obtaining hot-rolled steel strips advantageously in compliance with constraints and the like.
発明の課題
熱間圧延鋼帯を製造する工程、あるいはさらに冷間圧延
や焼鈍を施して冷間圧延銅帯を得る場合にあっても１熱
間圧延の段階において秤々の目的のために熱間圧延後に
コイルを高温で巻き取ったり１又は熱間圧延コイルを焼
鈍しｆｃシする取扱いが必要である。Problems of the Invention In the process of producing a hot rolled steel strip, or even in the case of obtaining a cold rolled copper strip by further cold rolling or annealing, heat is After rolling, it is necessary to wind the coil at a high temperature or to anneal and fc the hot-rolled coil.
例えば５ＵＳ４８０などフェライト系ステンレス鋼では
ｒ相を消去することを目的とし、高温で巻き取った熱間
圧延コイルをベル焼鈍炉などにおいて８００℃×５時間
程度の焼鈍を施し、また高炭素熱間圧延鋼帯を刃物、工
具などとして２次加工に供する場合はできるだけ軟質に
するために高温巻取シ後のコイルを焼鈍している。For example, in the case of ferritic stainless steel such as 5US480, in order to eliminate the r-phase, a hot-rolled coil wound at high temperature is annealed at 800°C for about 5 hours in a bell annealing furnace, and high carbon hot-rolled. When steel strips are used for secondary processing as blades, tools, etc., the coils are annealed after high-temperature winding to make them as soft as possible.
また−１低炭素Ａｔキルド鋼熱延銅帯を冷間圧延を経て
連続焼鈍する場合には、非時効を目指し、゛あるいは集
合組織の改善を目的として熱間圧延鋼帯の高温における
巻き取ル後に保温装置中に一定時間保持してカーバイド
及びＡｔＮを十分析出させることなども工程的に行なわ
ｎて込る（特開昭５８−８７１２８号公報所載）。In addition, when hot-rolled copper strips of -1 low carbon At-killed steel are subjected to continuous annealing after cold rolling, the coiling method at high temperatures of the hot-rolled steel strips is used to achieve non-aging or to improve the texture. Afterwards, the process includes holding the material in a heat insulating device for a certain period of time to release carbide and AtN (as disclosed in Japanese Patent Application Laid-Open No. 58-87128).
このような焼鈍をｂすことは、そｆ′Ｌ紀よって熱間圧
延銅帯の製造コストが高くな夛、懺た高塙巻き取シ後に
保温保持する場合でも十分高温にて所要時間の保持をす
ることが離しかったり、とくに内巻部と、外巻部の冷却
速度が早いために材質が不均一になったり、あるいはコ
イルエツジ部のスケールが厚くなってとｎにくくな夛、
酸洗性を悪くしたりするなど、多くの問題が残さｎてい
る。This type of annealing increases the manufacturing cost of hot rolled copper strips due to the process, and it is difficult to keep the hot rolled copper strip at a sufficiently high temperature for the required time even if it is kept warm after winding. The material may become uneven due to the fast cooling rate of the inner and outer windings, or the scale may become thick at the edge of the coil.
Many problems remain, such as poor pickling properties.
発明の目的
熱延コイルに施さｎる通常の焼鈍の代替として、より有
利に材質の均一化や、８次スケールの抑制を実現するこ
とを可能にする新規な熱間圧延銅帯の輿遣方法を提供す
ることが、この発明の目的であるＯ
発明の構成
この発明は、熱間圧延によって所定板厚の熱間圧延鋼帯
に仕上げ、該銅帯を高温でコイルに巻き取り１ついでこ
の高温コイルを、断熱材で上面を覆つ産金の上に載せ、
その上に内壁面を断熱材で覆ったカバーをかぶせてカバ
ーと台との間をシールした後、カバー内の空気を不活性
ガス又は還元性ガスに置換した上で、所定時間にわたっ
て保温し、七の間にコイル自身の保有熱で自己焼鈍し、
通常の焼鈍工程の代替とすることからなる熱間圧延鋼帯
の製造方法である・
さて第１図にこの発明の方法における保熱工程に適合す
る保熱装置の構成を示す０
図において１はホットコイル、２は台８の上面に設けた
断熱材、４はカバー５の内面に設けた断熱材であり、６
はシール用溝、７はシール液であるＯ
熱間圧延によって所定板厚の熱間圧延鋼帯に仕上け、該
銅帯を所定の高温度にて巻き取った熱延°コイル１を断
熱材２で上面を覆った台８の上に載せ、その上に内面壁
を断熱材４で祷ったカバー５をかぶせる。Purpose of the Invention A novel method for conveying hot-rolled copper strips, which makes it possible to more advantageously achieve homogeneity of material quality and suppression of 8th scale, as an alternative to normal annealing applied to hot-rolled coils. It is an object of the present invention to provide O.Structure of the Invention This invention provides a method for finishing a hot-rolled steel strip with a predetermined thickness by hot rolling, winding the copper strip into a coil at a high temperature, and then rolling the copper strip into a coil at a high temperature. The coil is placed on top of the gold, which is covered with an insulating material,
After covering the inner wall surface with a cover covered with a heat insulating material and sealing between the cover and the stand, the air inside the cover is replaced with an inert gas or a reducing gas, and the temperature is kept for a predetermined period of time. Self-annealing with the coil's own heat during the seven-year period,
This is a method for manufacturing hot-rolled steel strips that replaces the normal annealing process. Figure 1 shows the configuration of a heat retention device that is suitable for the heat retention process in the method of the present invention. Hot coil, 2 is a heat insulating material provided on the top surface of the stand 8, 4 is a heat insulating material provided on the inner surface of the cover 5, 6
is a sealing groove, and 7 is a sealing liquid O. A hot-rolled steel strip with a predetermined thickness is finished by hot rolling, and the copper strip is wound at a predetermined high temperature. It is placed on a stand 8 whose upper surface is covered with 2, and a cover 5 whose inner wall is covered with a heat insulating material 4 is placed thereon.
このカバー５と台３との間は、気体がもれないようにシ
ールするものとし、た表えば台８に設けたシール用益６
にシール液７として例えば合成油を入２１．１カバー５
の裾周を液封することにより、カバー内外の気体の流通
をさえぎる〇
カバー５は、カップリング８を介してポンプの吸い込み
側配管９を、またカップリンタ１０を介してたとえば不
活性カス供給配管１１をそｎＡ：ｎ。The space between the cover 5 and the stand 3 shall be sealed to prevent gas from leaking, for example, the seal 6 provided on the stand 8.
Add, for example, synthetic oil as sealing liquid 7 to 21.1 Cover 5.
The cover 5 blocks the flow of gas inside and outside the cover by liquid-sealing the hem of the cover 5. The cover 5 connects the suction side piping 9 of the pump via the coupling 8 and the inert gas supply piping via the coupler 10. 11 sonA:n.
連結してカバーｂ内の空気をパージし、かつ不活性ガス
によって置排する。The air in the cover b is purged and evacuated with an inert gas.
この置換のあとは必要に応じ配管をはずして置換さｎた
不活性ガスを密封してもよい。After this replacement, if necessary, the piping may be removed and the replaced inert gas sealed.
なお吸い込み側配管９は、排気ポンプに連結するのを不
可欠とするわけでなく、単にカバー内の気体を大気中に
放出するのに役立たせてもよい。Note that the suction side piping 9 does not necessarily need to be connected to the exhaust pump, and may simply serve to discharge the gas within the cover into the atmosphere.
この状態にて本ユニットを所定場所に搬送し、ｎｃ Ｗ
ｌｌｘ ｔｌＵ Ｉｆふ４−ｆｆｉ （）ｇ ；ＨＨ
−Ｊ−ｔｒ＋ ＦＪＩ Ｉｆ Ｍイル白刃・′の保有熱
で自゛己焼鈍し、もって通常工程で実施さｎるベル焼鈍
などの焼鈍工程の代替にすることができる。In this state, transport this unit to a specified location and nc W
llx tlU Iffu4-ffi ()g ;HH
-J-tr+ It is self-annealed with the heat retained by FJI If M Ill White Blade, and can be used as an alternative to an annealing process such as bell annealing that is carried out in a normal process.
酸洗以後の工程については通常の工程にて熱間圧延鋼帯
を製造することができる。As for the steps after pickling, a hot rolled steel strip can be manufactured by normal steps.
この発明に従り熱間圧延鋼帯を製造した実施例を以下に
示す。Examples of manufacturing hot rolled steel strips according to the present invention are shown below.
実施例 Ｉ
ＪＩＳ規格ＳＫ ａ相当成分の高炭素鋼を板厚２．８龍
に至る熱間圧延として、仕上終了温度８１０℃にて仕上
圧延した後、温度６８０℃にて巻き取った後、第１図に
示すようにして、保熱工程に供した０ここに巻き取シ終
了後１５分以内に台ａ上でカバー６をかぶせ、６分間に
わたるＮ、ガスの置換通人を行った後、密封し２４ＦＩ
？ｆ間にわたって自己焼鈍し、その後カバー５をとシは
ずして自然放冷した後、通常工程では実施するベル焼鈍
などを省略して、その１１酸洗した◇
保熱工程においてコイルの側面中央に熱電対を取り付け
、幌度を測定した結果、保熱カバーをか°ぶせた時６２
０“０まで低下した後Ｓ１時間後に６３０“Ｃまで復熱
し、以降２時間後６２０℃、４時間後６０５℃、１０時
間後５４０℃、２４時間後４５０’０であった◇
この熱にコイルの長手方向のかたさのばらつきを調べた
結果、従来の高温巻取のままであると、コイル外巻き部
約２０ｍにわたるかたさは、ミドル部のかたさに対し、
ＨＢで約２０ポイント高いのが、この発明による保熱工
程を通したコイルでの両者の差は表１に示す如く顕著に
軽減し、材質の均一化が達成さ几た。Example I A high carbon steel having a composition equivalent to JIS standard SK a was hot rolled to a plate thickness of 2.8 mm, finish rolled at a finishing temperature of 810°C, and then wound at a temperature of 680°C. As shown in Figure 1, within 15 minutes after the winding process was completed, a cover 6 was placed on table a, and N and gas were replaced for 6 minutes. Sealed 24FI
? The coil was self-annealed for a period of f, then the cover 5 was removed and the coil was allowed to cool naturally.Then, the bell annealing, which is carried out in the normal process, was omitted and the coil was pickled. As a result of installing the pair and measuring the degree of hood, it was 62 when the heat insulating cover was covered.
After dropping to 0"0", it reheated to 630"C after 1 hour, then 620"C after 2 hours, 605"C after 4 hours, 540"C after 10 hours, and 450"C after 24 hours. As a result of investigating the variation in hardness in the longitudinal direction of the coil, it was found that if the conventional high-temperature winding is continued, the hardness over about 20 m of the outer coil part will be lower than that of the middle part.
Although HB was about 20 points higher, the difference between the two was significantly reduced in the coil that underwent the heat retention process according to the present invention, as shown in Table 1, and uniformity of the material was achieved.
また従来工程品はエツジ部のスケールがと牡にくいため
に酸洗速度がｓ ｏ ｍｐｍであったものが、本発明法
によｎばｔｉｏｍｐｍにまであげることができ、酸洗ラ
インの生産性が大幅に改善さ几た。In addition, the pickling speed of conventional process products was s o m pm because the scale on the edges was difficult to remove, but with the method of the present invention, it is possible to increase the pickling speed to s o m pm, which improves the productivity of the pickling line. Greatly improved.
表１ 得らｎた製品のかたさくＨＪＩ）Ｎ：調査対象コ
イル数 （Ｎ＝１０） （Ｎ＝１１ｉ）°実施例 ２
ＪＩＳ規格ＳＵＳ ４８０相当成分のフェライト系ステ
ンレス鋼を板厚３．２關に熱間圧延し、その仕上終了ｓ
度８５０℃にて仕上圧延して後、近接コイラにて温度ｓ
ｏ ｏ ’ｏで巻き取って後、第１図に示したように
して保熱工程に供した。Table 1 Hardness of the obtained product (HJI)N: Number of coils to be investigated (N=10) (N=11i)°Example 2 Ferritic stainless steel with components equivalent to JIS standard SUS 480 was made with a plate thickness of 3.2 mm. Hot rolled to finish the finish.
After finish rolling at 850℃, the temperature s is
After winding up with o o 'o, it was subjected to a heat retention process as shown in FIG.
ここに巻き取シ終了後、１８分以内に台３上で保熱カバ
ー５をかぶせ、７分間にわたるＮ２ガスの置換通人を行
った後、密封し、３０時間にわたって自己焼鈍し、その
後カバー５をはずし、自然放冷した。After winding is completed, the heat insulating cover 5 is placed on the table 3 within 18 minutes, and after replacing the N2 gas for 7 minutes, the cover is sealed and self-annealed for 30 hours. was removed and allowed to cool naturally.
このコイル１の外側面に熱伝対を取り付は温度の変化を
調べた結果、カバーをかぶせた時点で７４０℃まで低下
したのが８０分後には７８０℃まで復熱し、１時間後も
７８０’０，５時間後７６０ ’０１１０時間後７時間
後、２０時間後にａａｏ’ｏ、ａｏ待時間後５８０ ’
Ｏであった。A thermocouple was attached to the outer surface of coil 1, and as a result of examining the temperature change, the temperature dropped to 740°C when the cover was placed, but after 80 minutes, the temperature had returned to 780°C, and after 1 hour, the temperature remained at 780°C. '0, 5 hours later 760 '0110 hours 7 hours later, 20 hours later aao'o, ao 580' after waiting time
It was O.
放冷後通常工程では実施さｎるベル焼鈍を省略し、その
ｔま酸洗し、その後通常工程と同じに板厚０．７ｍ１ｉ
で冷間圧延し、ＡＰラインを通して連続゛焼鈍酸洗した
後調質圧延して得らｆ′した與品の特性を調べた結果を
表２に示す。After cooling, the bell annealing that is carried out in the normal process was omitted, and pickling was then carried out, and then the plate thickness was 0.7 m1i as in the normal process.
Table 2 shows the results of investigating the characteristics of the product obtained by cold rolling, continuous annealing and pickling through an AP line, and then temper rolling.
同表で明らかなように従来工程の熱延コイルをベル焼鈍
を行ったものと同等の特性が得らｎた。As is clear from the same table, characteristics equivalent to those obtained by bell annealing the hot-rolled coil in the conventional process were obtained.
また冷間圧蛭前の酸洗速度も従来２０ ｍｐｍであった
ものが、本発明法による場合にＨａ ５ ｍｐｍまであ
がり、ラインの生産性が改善さ１．た。In addition, the pickling speed before cold pressing was conventionally 20 mpm, but when using the method of the present invention, it increased to Ha 5 mpm, improving the productivity of the line. Ta.
発明の効果
この発明によｎば、熱曲圧４Ｔｒ、鋼帯の仕上げ圧延段
階以降の取扱いにおいて従来必要さされた焼鈍を不要と
して、そのコストを削減し、また従来のの力、′（造コ
スートを著しく低減できる０Effects of the Invention According to the present invention, it is possible to eliminate the need for annealing, which was conventionally required in the handling of steel strips after the finish rolling stage using a 4Tr hot bending press, thereby reducing the cost. Cost can be significantly reduced0
第１図は、熱間圧延鋼帯コイル保熱装置を例示した断面
図である。
特ｒ「出願人 川崎製鉄株式会社
代理人弁理士 杉 村 暁 秀
同 弁理士 杉 村 興 作FIG. 1 is a cross-sectional view illustrating a hot-rolled steel strip coil heat retention device. Special Applicant: Kawasaki Steel Co., Ltd. Representative Patent Attorney: Hidetoshi Sugimura Patent Attorney: Kosaku Sugimura
Claims (1)
、該銅帯を高温でコイルに巻き取り、ついでこの高温コ
イルを、断熱材で上面を覆った台の上に載せ、その上に
内壁面を断熱材で株ったカバーをかぶせｔカバーと台と
の間をシールした後、カバー内の空気を不活性ガス又は
還元性ガスに置換した上で、所定時間にわたつで保温し
、その間にコイル自身の保有熱で自己焼鈍し、通常の焼
鈍工程の代替とすることを特徴とする熱間圧延銅帯の製
造方法。L A hot-rolled steel strip with a predetermined thickness is finished by hot rolling, the copper strip is wound into a coil at high temperature, and then this high-temperature coil is placed on a table whose upper surface is covered with a heat insulating material, and After covering the inner wall surface with a cover made of insulating material and sealing the space between the cover and the stand, the air inside the cover is replaced with an inert gas or reducing gas, and then kept warm for a specified period of time. A method for producing a hot-rolled copper strip, which is characterized in that the coil is self-annealed using its own heat during the process, thereby replacing the normal annealing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22986183A JPS60125329A (en) | 1983-12-07 | 1983-12-07 | Production of hot rolled steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22986183A JPS60125329A (en) | 1983-12-07 | 1983-12-07 | Production of hot rolled steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60125329A true JPS60125329A (en) | 1985-07-04 |
Family
ID=16898841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22986183A Pending JPS60125329A (en) | 1983-12-07 | 1983-12-07 | Production of hot rolled steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60125329A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0343008A2 (en) * | 1988-05-19 | 1989-11-23 | Middelburg Steel And Alloys (Proprietary) Limited | Heat treatment of corrosion resistant steels |
| KR20010095809A (en) * | 2000-04-12 | 2001-11-07 | 이구택 | Method for manufacturing ferritic stainless hot rolled steel sheet |
| JP2015214732A (en) * | 2014-05-12 | 2015-12-03 | Ｊｆｅスチール株式会社 | Production method of high-strength steel sheet |
| JP2016148063A (en) * | 2015-02-10 | 2016-08-18 | Ｊｆｅスチール株式会社 | Manufacturing method and treatment facility of high strength steel sheet |
| KR20200063162A (en) * | 2017-09-20 | 2020-06-04 | 바오스틸 잔장 아이론 앤드 스틸 컴퍼니 리미티드 | Stationary hot coil heat insulation heat treatment device |
| JP2020534441A (en) * | 2017-09-20 | 2020-11-26 | 宝鋼湛江鋼鉄有限公司Ｂａｏｓｔｅｅｌ Ｚｈａｎｊｉａｎｇ Ｉｒｏｎ ＆ Ｓｔｅｅｌ Ｃｏ．， Ｌｔｄ． | Mobile hot coil heat insulation heat treatment equipment |
| JP2020534440A (en) * | 2017-09-20 | 2020-11-26 | 宝鋼湛江鋼鉄有限公司Ｂａｏｓｔｅｅｌ Ｚｈａｎｊｉａｎｇ Ｉｒｏｎ ＆ Ｓｔｅｅｌ Ｃｏ．， Ｌｔｄ． | Hot rolling in-line moving thermal insulation heat treatment process and heat treatment line |
-
1983
- 1983-12-07 JP JP22986183A patent/JPS60125329A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0343008A2 (en) * | 1988-05-19 | 1989-11-23 | Middelburg Steel And Alloys (Proprietary) Limited | Heat treatment of corrosion resistant steels |
| KR20010095809A (en) * | 2000-04-12 | 2001-11-07 | 이구택 | Method for manufacturing ferritic stainless hot rolled steel sheet |
| JP2015214732A (en) * | 2014-05-12 | 2015-12-03 | Ｊｆｅスチール株式会社 | Production method of high-strength steel sheet |
| JP2016148063A (en) * | 2015-02-10 | 2016-08-18 | Ｊｆｅスチール株式会社 | Manufacturing method and treatment facility of high strength steel sheet |
| KR20200063162A (en) * | 2017-09-20 | 2020-06-04 | 바오스틸 잔장 아이론 앤드 스틸 컴퍼니 리미티드 | Stationary hot coil heat insulation heat treatment device |
| JP2020534442A (en) * | 2017-09-20 | 2020-11-26 | 宝鋼湛江鋼鉄有限公司Ｂａｏｓｔｅｅｌ Ｚｈａｎｊｉａｎｇ Ｉｒｏｎ ＆ Ｓｔｅｅｌ Ｃｏ．， Ｌｔｄ． | Fixed hot coil heat insulation heat treatment equipment |
| JP2020534441A (en) * | 2017-09-20 | 2020-11-26 | 宝鋼湛江鋼鉄有限公司Ｂａｏｓｔｅｅｌ Ｚｈａｎｊｉａｎｇ Ｉｒｏｎ ＆ Ｓｔｅｅｌ Ｃｏ．， Ｌｔｄ． | Mobile hot coil heat insulation heat treatment equipment |
| JP2020534440A (en) * | 2017-09-20 | 2020-11-26 | 宝鋼湛江鋼鉄有限公司Ｂａｏｓｔｅｅｌ Ｚｈａｎｊｉａｎｇ Ｉｒｏｎ ＆ Ｓｔｅｅｌ Ｃｏ．， Ｌｔｄ． | Hot rolling in-line moving thermal insulation heat treatment process and heat treatment line |
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