JP2006176877A - Annealing method for stainless steel sheet and annealing apparatus therefor - Google Patents

Annealing method for stainless steel sheet and annealing apparatus therefor Download PDF

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JP2006176877A
JP2006176877A JP2005359387A JP2005359387A JP2006176877A JP 2006176877 A JP2006176877 A JP 2006176877A JP 2005359387 A JP2005359387 A JP 2005359387A JP 2005359387 A JP2005359387 A JP 2005359387A JP 2006176877 A JP2006176877 A JP 2006176877A
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stainless steel
annealing
steel strip
roughness
heating
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JP2006176877A5 (en
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Alain Marchal
マルシャル アラン
Francis Bourdon
ブルドン フランシス
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DMS SA
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    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for annealing a stainless steel sheet without needing the use of an agent, and to provide an annealing apparatus therefor. <P>SOLUTION: The method (4) for annealing the stainless steel sheet comprises: performing at least one rolling step; and performing typically continuously at least a step (2) of heating the stainless steel sheet in a reductive atmosphere, a step (2) of cooling the stainless steel sheet and a step (23) of transpripting roughness onto the surface of the stainless steel sheet. The apparatus (4) for annealing the stainless steel sheet comprises: a means (2) for heating the stainless steel sheet in the reductive atmosphere; a means (2) for cooling the stainless steel sheet; and a means (23) for transcripting the roughness onto the surface of the stainless steel sheet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ステンレス鋼帯の焼鈍方法および焼鈍装置に関する。   The present invention relates to a method and apparatus for annealing a stainless steel strip.

金属加工分野において、シートリールを作製するために、金属を１回または複数回の冷間圧延工程にかけることが知られている。   In the metal processing field, it is known to subject a metal to one or more cold rolling steps to produce a sheet reel.

そのためには、シート金属の帯を所定の走路を走らせて２つの円柱ロール間で圧延して厚さを減少させる。   For this purpose, a sheet metal strip is run on a predetermined track and rolled between two cylindrical rolls to reduce the thickness.

その結果、材料は硬化して延性が低下し高負荷に耐えるようになる。   As a result, the material hardens and becomes less ductile and can withstand high loads.

この金属帯の二次加工性を高めるために、焼鈍により軟化させ延性を回復させて材料を安定状態に戻す方法が知られている。   In order to improve the secondary workability of the metal strip, a method is known in which the material is softened by annealing and the ductility is recovered to return the material to a stable state.

その際、焼鈍には、いわゆる中間焼鈍およびいわゆる最終焼鈍の２つのタイプがある。   At that time, there are two types of annealing, so-called intermediate annealing and so-called final annealing.

ステンレス鋼帯を必要なシート厚さにするために、何回かの冷間圧延工程にかけることが多い。その場合、ステンレス鋼帯を閉ループに沿って循環させ、圧延ロール間を複数回通板させる。   Often, several cold rolling steps are applied to obtain the required sheet thickness for the stainless steel strip. In that case, the stainless steel strip is circulated along the closed loop, and a plurality of passes between the rolling rolls are passed.

しかし各1回の通板パスごとに、次のパスに備えて金属帯を軟化させる必要があり、そのために行なうのが中間焼鈍である。   However, it is necessary to soften the metal band in preparation for the next pass for each pass plate pass, and for this purpose, intermediate annealing is performed.

最終圧延工程の後に、シート金属またはステンレス鋼帯は軟化させて販売に適した美麗な仕上げにする必要があり、そのために行なうのが最終焼鈍である。   After the final rolling process, the sheet metal or stainless steel strip needs to be softened to a beautiful finish suitable for sale, for which final annealing is performed.

ここで、中間焼鈍後の仕上がり品質は最終焼鈍後の仕上がり品質と同等である必要は無い。そこで適した方法として、焼鈍後に化学媒体でエッチングする方法が知られている。   Here, the finished quality after the intermediate annealing does not have to be equal to the finished quality after the final annealing. Therefore, as a suitable method, a method of etching with a chemical medium after annealing is known.

最終焼鈍は光沢焼鈍すなわち上記の焼鈍＋エッチングとすることができる。   The final annealing can be gloss annealing, that is, the above annealing + etching.

光輝焼鈍は、密閉チャンバ炉内で、Ｎ２の混合比上限を２５％としたＨ２／Ｎ２混合ガスあるいは純粋Ｈ２の非酸化性の調整雰囲気中で行なう。 Bright annealing is performed in a non-oxidizing adjusted atmosphere of H 2 / N 2 mixed gas or pure H 2 in which the upper limit of the mixing ratio of N 2 is 25% in a closed chamber furnace.

これは従来から、電気抵抗炉、ガス式マッフル炉、更には、両者を組み合わせたハイドライド路を用いて行なっている。   Conventionally, this is performed by using an electric resistance furnace, a gas muffle furnace, and a hydride path combining both.

光輝焼鈍の別の方法として、横磁束誘導加熱法は、帯材の温度を直接上昇させることができる。   As another method of bright annealing, the transverse magnetic flux induction heating method can directly increase the temperature of the strip.

一般に、炉の後段には、外周面を鏡面研磨した少なくとも１対のロールがあって、いわゆる「スキンパス」により帯材の表面圧延を行なう。   Generally, there is at least one pair of rolls whose outer peripheral surfaces are mirror-polished at the subsequent stage of the furnace, and the surface of the strip is rolled by a so-called “skin pass”.

このように光輝焼鈍プロセスを行なうことにより、国際分類のＢＡに該当する高品質の仕上がりが得られる。   By performing the bright annealing process in this manner, a high-quality finish corresponding to the international classification of BA can be obtained.

しかし、高品質仕上げは表面粗度が余りに小さいので、シート製品の捺印が容易でない。実際に、過剰に平滑な表面は捺印には不適である。   However, high quality finishes are not easy to stamp on sheet products because the surface roughness is too small. In fact, an excessively smooth surface is not suitable for stamping.

その対策として、鋼帯に焼鈍・エッチング法を施すことにより捺印を容易にするのに十分な表面粗度を得ることができる。   As a countermeasure, it is possible to obtain a surface roughness sufficient to facilitate stamping by subjecting the steel strip to annealing / etching.

その場合、焼鈍は開放型のチャンバ炉で行なう。酸素含有量は鋼種に応じて３〜６％の範囲内で調整する。雰囲気が酸化性なので、化学エッチング処理して表面酸化膜もしくはスケールを除去する必要がある。   In that case, annealing is performed in an open chamber furnace. The oxygen content is adjusted within a range of 3 to 6% depending on the steel type. Since the atmosphere is oxidizing, it is necessary to remove the surface oxide film or scale by chemical etching.

この化学処理を行うと、処理対象鋼種に関係して種々の化学薬品を用いることになり、気体状や液体状の廃棄物が発生する。   When this chemical treatment is performed, various chemicals are used in relation to the steel type to be treated, and gaseous or liquid waste is generated.

例えば化学薬品として下記のものが知られている。   For example, the following chemicals are known.

◇ 硫酸ナトリウム：ＡＩＳＩ ３００およびＡＩＳＩ ４００用の電解欲として用いられ、Ｃｒ＋６が発生する。 ◇ Sodium sulfate: Used as electrolysis for AISI 300 and AISI 400, Cr +6 is generated.

◇ 硝酸（ＨＮＯ３）：ＡＩＳＩ ４００の不働態化処理に用いられ、硝酸塩が発生する。 ◇ Nitric acid (HNO 3 ): Used to passivate AISI 400, and nitrate is generated.

◇ フッ化水素酸（ＨＦ）と硝酸（ＨＮＯ３）との混合酸：ＮＯｘヒューム（黄色）、硝酸塩、フッ化物が発生する。 ◇ Mixed acid of hydrofluoric acid (HF) and nitric acid (HNO 3 ): NOx fume (yellow), nitrate and fluoride are generated.

上記のエッチング処理を施すと、国際分類でいわゆる２Ｄの仕上げ品質が得られる。エッチング処理した鋼帯を鏡面研磨ロールにかけて非常に僅かな伸びが生ずる程度に圧延すると細かい粗面が得られる。   When the above etching process is performed, a so-called 2D finish quality is obtained in the international classification. When the etched steel strip is rolled on a mirror polishing roll and rolled to such an extent that very slight elongation occurs, a fine rough surface can be obtained.

これにより、いわゆる２Ｂの仕上げ品質になる。しかしながら、この方法では、エッチングに必要な化学薬品とそれを用いて化学薬品浴および電解浴を加熱するためのエネルギーに加えて、環境汚染防止のための処理も必要であり、操業コストが大幅に押し上げられる。   This results in a so-called 2B finish quality. However, in this method, in addition to the chemicals required for etching and the energy for heating the chemical bath and electrolytic bath using the chemicals, a treatment for preventing environmental pollution is also required, which greatly increases the operating cost. Pushed up.

上記の化学薬剤を用いた従来公知の焼鈍・エッチング法は、生産容量が概ね１８０，０００トン／年〜２３０，０００トン／年の範囲である。従来の炉を用いた光輝焼鈍は、それ自体の生産容量は小さくて、６０，０００トン／年〜１００，０００トン／年の範囲である。   Conventionally known annealing / etching methods using the above chemical agents have a production capacity in the range of about 180,000 tons / year to 230,000 tons / year. Bright annealing using a conventional furnace has a small production capacity of itself, ranging from 60,000 tons / year to 100,000 tons / year.

本発明は、上記従来技術の欠点を改良し、特に薬剤の使用を必要としない焼鈍方法および焼鈍装置を提供することを目的とする。   An object of the present invention is to provide an annealing method and an annealing apparatus that improve the above-mentioned drawbacks of the prior art and do not particularly require the use of chemicals.

本発明のもう１つの目的は、捺印操作を可能とする表面品質２Ｄまたは２Ｂが得られる、ステンレス鋼帯の最終焼鈍方法を提供することである。   Another object of the present invention is to provide a method of final annealing of a stainless steel strip that provides a surface quality 2D or 2B that allows a stamping operation.

本発明の上記以外の目的および利点については、非限定的な実施例を含めた以下の説明により詳述する。   Other objects and advantages of the present invention will be described in detail in the following description including non-limiting examples.

本発明のステンレス鋼帯の焼鈍方法は、少なくとも１回の圧延工程を経た後に、少なくとも下記の工程：
上記ステンレス鋼帯を還元性雰囲気中で加熱する工程、
上記ステンレス鋼帯を冷却する工程、
上記ステンレス鋼帯の表面に粗さを転写する工程
を、典型的には連続して、行なう。 The method for annealing a stainless steel strip of the present invention, after undergoing at least one rolling step, at least the following steps:
Heating the stainless steel strip in a reducing atmosphere;
Cooling the stainless steel strip,
The step of transferring the roughness to the surface of the stainless steel strip is typically performed continuously.

本発明のステンレス鋼帯の焼鈍装置は、
上記ステンレス鋼帯を還元性雰囲気中で加熱する手段、
上記ステンレス鋼帯を冷却する手段、
上記ステンレス鋼帯の表面に粗さを転写する手段
を含む。 The stainless steel strip annealing apparatus of the present invention,
Means for heating the stainless steel strip in a reducing atmosphere;
Means for cooling the stainless steel strip,
Means for transferring the roughness to the surface of the stainless steel strip.

図１に示す従来の焼鈍方法を含む圧延方法は、最初の焼鈍と化学薬剤によるエッチングとを行なう工程２０を含む。図示したように、この工程を完了したステンレス鋼帯の品質は国際分類の２Ｄである。   The rolling method including the conventional annealing method shown in FIG. 1 includes a step 20 of performing an initial annealing and etching with a chemical agent. As shown, the quality of the stainless steel strip that has completed this process is 2D of international classification.

次に、ステンレス鋼体を鏡面研磨ロール２１による表層圧延にかける。この工程を出たステンレス鋼帯の品質は国際分類の２Ｂである。   Next, the stainless steel body is subjected to surface layer rolling with a mirror polishing roll 21. The quality of the stainless steel strip after this process is 2B of the international classification.

焼鈍工程２０は焼鈍とエッチングとで構成されていて、中間焼鈍とすることができる。その場合は、鋼帯は閉ループに沿って圧延ロールに複数回かけて必要な厚さにする。   The annealing process 20 includes annealing and etching, and can be an intermediate annealing. In that case, the steel strip is rolled over the rolling roll along the closed loop to the required thickness.

図２に、従来の光輝焼鈍タイプの最終焼鈍を含む圧延方法を模式的に示す。特筆すべきは、光輝焼鈍なので化学薬剤による処理が必要ないことである。望ましくは、個々の光輝焼鈍炉の露点はできる限り低くすべきである。   FIG. 2 schematically shows a rolling method including final bright annealing type final annealing. What should be noted is that it is a bright annealing and does not require chemical treatment. Desirably, the dew point of the individual bright annealing furnace should be as low as possible.

現在、光輝焼鈍炉には下記の３種類があって、どれも縦型炉である。   Currently, there are three types of bright annealing furnaces, all of which are vertical furnaces.

◇ 電気抵抗加熱によるレンガ炉：比較的旧い形態であり、汎用性が低く、露点が高い。処理容量は最大１５トン／時間である。     ◇ Brick furnace by electric resistance heating: It is a relatively old form with low versatility and high dew point. The maximum processing capacity is 15 tons / hour.

◇ ガス加熱によるマッフル炉：最も信頼性が高い。ただし、マッフルの長さの上限が２６〜２７ｍであるため、処理容量は１０トン／時間止まりである。     ◇ Muffle furnace with gas heating: Most reliable. However, since the upper limit of the muffle length is 26 to 27 m, the processing capacity is only 10 tons / hour.

◇ 混合型炉：上記２種類の型を複雑に組み合わせた形態であり、最大処理容量は１２〜１３トン／時間である。     ◇ Mixed furnace: A form in which the above two types are combined in a complicated manner, and the maximum processing capacity is 12 to 13 tons / hour.

横磁束誘導加熱炉も知られている。誘導加熱の主な利点は電力効率が高いことであり、高い表面電力によって金属帯材を所望温度にまで高速で加熱できる。   Transverse magnetic induction furnaces are also known. The main advantage of induction heating is high power efficiency, and the metal strip can be heated to a desired temperature at high speed with high surface power.

そこで本発明は、最初の圧延工程後にステンレス鋼帯に施す焼鈍方法４であって、少なくとも下記の工程：
上記ステンレス鋼帯を還元性雰囲気中で加熱する工程、
上記ステンレス鋼帯の表面に粗さを転写する工程
を、順序は限定せずに、行なう。 Therefore, the present invention is an annealing method 4 applied to the stainless steel strip after the first rolling step, and at least the following steps:
Heating the stainless steel strip in a reducing atmosphere;
The step of transferring the roughness to the surface of the stainless steel strip is performed without limiting the order.

一実施形態によれば、ステンレス鋼帯は上記加熱後に効率的に冷却される。   According to one embodiment, the stainless steel strip is efficiently cooled after the heating.

一実施形態によれば、下記の工程：
上記ステンレス鋼帯を還元性雰囲気中で加熱する工程、
上記ステンレス鋼帯を、望ましくは還元性雰囲気中で、冷却する工程、
上記ステンレス鋼帯の表面に粗さを転写する工程、
を、望ましくは連続して、行なう。 According to one embodiment, the following steps:
Heating the stainless steel strip in a reducing atmosphere;
Cooling the stainless steel strip, preferably in a reducing atmosphere,
Transferring the roughness to the surface of the stainless steel strip,
Are preferably performed continuously.

還元性雰囲気としては、最大２５％のＮ２を含むＨ２／Ｎ２混合ガスまたは純粋Ｈ２を用いることができる。 As the reducing atmosphere, an H 2 / N 2 mixed gas containing up to 25% N 2 or pure H 2 can be used.

他の実施形態として、加熱は、ガス加熱炉、電気抵抗加熱、縦磁束または横磁束の誘導加熱を用いてもよい。   As another embodiment, the heating may be performed by using a gas heating furnace, electric resistance heating, induction heating of longitudinal magnetic flux or transverse magnetic flux.

帯材の加熱設備は縦型に設置される。   The strip heating equipment is installed vertically.

望ましくは、鋼帯は還元性ガスを循環させて冷却する。   Desirably, the steel strip is cooled by circulating a reducing gas.

本発明の方法によれば、生産能力を２００，０００トン／年以上にすることができる。加熱と急速冷却を行なうに際して、加熱パワーはメガワット／ｍ２、冷却速度は１００℃／秒である。 According to the method of the present invention, the production capacity can be increased to 200,000 tons / year or more. When performing heating and rapid cooling, the heating power is megawatt / m 2 and the cooling rate is 100 ° C./second.

望ましくは、表層圧延（スキンパス圧延）で粗さを転写するとステンレス鋼帯は僅かに伸びる。   Desirably, when the roughness is transferred by surface layer rolling (skin pass rolling), the stainless steel strip slightly extends.

一実施形態によれば、ステンレス鋼帯への捺印を容易にするのに十分な粗さを表層圧延により転写できる。   According to one embodiment, sufficient roughness can be transferred by surface rolling to facilitate stamping on the stainless steel strip.

一実施形態によれば、国際分類の品質２Ｄのステンレス鋼の粗さと同等の粗さを転写する。この品質のステンレス鋼は、従来技術の場合は焼鈍とエッチングを行なう方法で得ることができたものである。   According to one embodiment, a roughness equivalent to that of internationally classified quality 2D stainless steel is transferred. This quality stainless steel can be obtained by the method of annealing and etching in the case of the prior art.

他の実施形態によれば、国際分類の品質２Ｂのステンレス鋼の粗さと同等の粗さを転写する。この品質のステンレス鋼は、従来技術の焼鈍方法の場合は、焼鈍とエッチングを行なった後に鏡面研磨ロールで表層圧延を付加する方法で得ることができたものである。   According to another embodiment, a roughness equivalent to that of an internationally classified quality 2B stainless steel is transferred. In the case of the prior art annealing method, this quality stainless steel can be obtained by a method of adding surface rolling with a mirror polishing roll after annealing and etching.

本発明は更に上記本発明の方法を実施するための装置をも提供する。本発明の装置は、
上記ステンレス鋼帯を還元性雰囲気中で加熱する手段２、
上記ステンレス鋼帯を冷却する手段２、
上記ステンレス鋼帯の表面に粗さを転写する手段２３
を備えている。 The present invention further provides an apparatus for carrying out the above-described method of the present invention. The device of the present invention
Means 2 for heating the stainless steel strip in a reducing atmosphere;
Means 2 for cooling the stainless steel strip,
Means 23 for transferring roughness to the surface of the stainless steel strip
It has.

ステンレス鋼帯の表面に粗さを転写する手段は、粗面を持つ少なくとも１対のロールを含む圧延装置で構成される。   The means for transferring the roughness to the surface of the stainless steel strip is constituted by a rolling device including at least a pair of rolls having a rough surface.

一実施形態によれば、加熱手段は誘導加熱手段による縦型炉２で構成される。   According to one embodiment, the heating means comprises a vertical furnace 2 with induction heating means.

一実施形態によれば、縦型炉２は下記の構成要素：
入側シール手段、
ステンレス鋼帯の張力を制御および測定する手段、
ステンレス鋼帯の張力を調節する作動手段、
横磁束誘導加熱手段、
冷却手段、
出側シール手段
の全てまたは一部を備えている。 According to one embodiment, the vertical furnace 2 has the following components:
Entry side sealing means,
Means to control and measure the tension of the stainless steel strip,
Operating means to adjust the tension of the stainless steel strip,
Transverse magnetic induction heating means,
Cooling means,
All or part of the exit side sealing means is provided.

誘導加熱手段は、鋼帯を横切る磁場を発生でき鋼帯に平行な２つのリールから成ることが望ましい。この手段はステンレス鋼帯を１２００℃まで加熱できる。   The induction heating means is preferably composed of two reels that can generate a magnetic field across the steel strip and are parallel to the steel strip. This means can heat the stainless steel strip to 1200 ° C.

冷却手段は鋼帯の温度降下を加速できる。冷却手段はガス循環手段の形と取ることが望ましい。この循環冷却ガスは非酸化性であることが望ましい。   The cooling means can accelerate the temperature drop of the steel strip. The cooling means is preferably in the form of a gas circulation means. This circulating cooling gas is preferably non-oxidizing.

望ましくは、冷却手段は１００℃／秒以上の冷却速度で冷却できることが望ましい。   Desirably, the cooling means can cool at a cooling rate of 100 ° C./second or more.

一実施形態によれば、本発明の装置は更に、ステンレス鋼帯の表面粗さ測定手段および／または粗面ロールの加圧力制御手段を備えることができる。   According to one embodiment, the apparatus of the present invention may further comprise means for measuring the surface roughness of the stainless steel strip and / or means for controlling the pressure of the rough roll.

図３に示すように、圧延設備は、冷間圧延ロール１と本発明の焼鈍装置とを備えており、横磁束式誘導縦型炉２と、少なくとも１対の粗面ロール２３を含む表層圧延装置とを備えている。   As shown in FIG. 3, the rolling equipment includes a cold rolling roll 1 and the annealing apparatus of the present invention, and a surface layer rolling including a transverse magnetic flux induction vertical furnace 2 and at least one pair of rough surface rolls 23. Device.

焼鈍装置は上記圧延ロール１の下流側に配置することが望ましい。ステンレス鋼帯はまた、閉ループ２２’を巡らせて、圧延ロール１によって複数回の圧延を行なうことができる。   It is desirable to arrange the annealing device on the downstream side of the rolling roll 1. The stainless steel strip can also be rolled multiple times by the rolling roll 1 around the closed loop 22 '.

粗面ロール２３を通った後のステンレス鋼帯の品質は２Ｂ＋である。これは従来、焼鈍・エッチング法で得られていた２Ｂの品質と同等の品質である。 The quality of the stainless steel strip after passing through the rough roll 23 is 2B + . This is a quality equivalent to the 2B quality that has been conventionally obtained by annealing and etching.

この焼鈍工程は、圧延工程でステンレス鋼帯の軟化と延性回復を狙った中間焼鈍に適用できる。   This annealing process can be applied to intermediate annealing aiming at softening and ductility recovery of the stainless steel strip in the rolling process.

この焼鈍工程はまた、圧延工程で最終焼鈍にも適用できる。特に、捺印対象であるステンレス鋼帯の最終焼鈍に適用できる。この焼鈍工程を施す対象鋼としては２鋼種すなわちＡＩＳＩ ３００、ＡＩＳＩ ４００がある。   This annealing process can also be applied to final annealing in the rolling process. In particular, it can be applied to the final annealing of a stainless steel strip to be stamped. As steels to be subjected to this annealing process, there are two steel types, namely AISI 300 and AISI 400.

従来の焼鈍・エッチングにより得られる品質２Ｂのステンレス鋼ＡＩＳＩ ３００と、品質２Ｂ＋のステンレス鋼ＡＩＳＩ ３００との主な違いとして、品質２Ｂが乳白色であるのに対して品質２Ｂ＋が無光沢灰色である。 The main difference between the quality 2B stainless steel AISI 300 obtained by conventional annealing and etching and the quality 2B + stainless steel AISI 300 is that the quality 2B + is milky white while the quality 2B + is matte gray. is there.

本発明の焼鈍工程によれば、高速昇温と高エネルギー効率が達成できる。   According to the annealing process of the present invention, high temperature increase and high energy efficiency can be achieved.

本発明の方法は環境汚染化学物質を発生させることがない。したがって、この焼鈍方法はエコロジーの観点からも望ましい。   The method of the present invention does not generate environmental pollutants. Therefore, this annealing method is desirable from the viewpoint of ecology.

既存の圧延設備をモジュール形式とすれば、用途に応じて粗面ロールまたは鏡面ロールを組み込むことができる。そのために、圧延ロールは用途に応じて交換できるように着脱可能とする。   If the existing rolling equipment is modular, a rough roll or a mirror roll can be incorporated depending on the application. Therefore, the rolling roll is made detachable so that it can be changed depending on the application.

そこで、図３に示す設備では、少なくとも１対の粗面ロール２３を含む表層圧延装置を配備し、出口２３’で品質２Ｂ＋のステンレス鋼帯がえら得るようにしてある。 Therefore, in the facility shown in FIG. 3, a surface layer rolling device including at least one pair of rough surface rolls 23 is provided so that a quality 2B + stainless steel strip can be obtained at the outlet 23 ′.

出口２１’では品質ＢＡの鋼が得られるように、粗面ロール２３に替えて鏡面ロール２１を組み込む。   At the outlet 21 ', a mirror roll 21 is incorporated in place of the rough roll 23 so that steel of quality BA can be obtained.

一方、焼鈍が単に中間焼鈍であり鋼帯が閉ループ２２’を辿って繰り返し圧延１を受ける場合には、粗面ロール２３あるいは鏡面ロール２１は開放状態にしておき鋼帯に表層圧延を施さない。   On the other hand, when the annealing is simply intermediate annealing and the steel strip is repeatedly rolled 1 following the closed loop 22 ', the rough surface roll 23 or mirror roll 21 is left open and the steel strip is not subjected to surface layer rolling.

もちろん、特許請求の範囲の枠内で他の実施形態が可能であることは、当業者に理解されるであろう。   Of course, those skilled in the art will appreciate that other embodiments are possible within the scope of the claims.

焼鈍後に化学薬剤を用いてエッチングする工程を含む従来の冷間圧延方法を示す模式図である。It is a schematic diagram which shows the conventional cold rolling method including the process etched using a chemical agent after annealing. 最終光輝焼鈍を含む従来の冷間圧延方法を示す模式図である。It is a schematic diagram which shows the conventional cold rolling method including final bright annealing. 本発明の焼鈍方法を含む冷間圧延方法を示す模式図である。It is a schematic diagram which shows the cold rolling method including the annealing method of this invention.

Claims (13)

ステンレス鋼帯の焼鈍方法（４）において、少なくとも最初の１回の圧延工程（１）を経た後に、少なくとも下記の工程：
上記ステンレス鋼帯を還元性雰囲気中で加熱する工程（２）、
上記ステンレス鋼帯を冷却する工程（２）、
上記ステンレス鋼帯の表面に粗さを転写する工程（２３）
を行なうことを特徴とするステンレス鋼帯の焼鈍方法。 In the stainless steel strip annealing method (4), after at least the first rolling step (1), at least the following steps:
Heating the stainless steel strip in a reducing atmosphere (2),
Step (2) of cooling the stainless steel strip,
Step of transferring roughness to the surface of the stainless steel strip (23)
A method of annealing a stainless steel strip, characterized in that 請求項１において、上記加熱を、ガス炉、電気抵抗炉、縦磁束誘導炉または横磁束誘導炉のいずれかによって行なうことを特徴とする焼鈍方法。   The annealing method according to claim 1, wherein the heating is performed by any of a gas furnace, an electric resistance furnace, a longitudinal magnetic flux induction furnace, or a transverse magnetic flux induction furnace. 請求項１において、上記鋼帯の冷却を、還元性ガスの循環によって行なうことを特徴とする焼鈍方法。   2. An annealing method according to claim 1, wherein the steel strip is cooled by circulation of a reducing gas. 請求項１から３までのいずれか１項において、上記粗さを転写する工程において、上記ステンレス鋼帯の捺印を容易にするのに十分な粗さを表層圧延によって転写することを特徴とする焼鈍方法。   The annealing according to any one of claims 1 to 3, wherein in the step of transferring the roughness, the surface of the stainless steel strip is transferred with a roughness sufficient to facilitate the stamping of the stainless steel strip. Method. 請求項１において、ステンレス鋼についての国際分類の品質２Ｂまたは２Ｄに対応する粗さを転写することを特徴とする焼鈍方法。   The annealing method according to claim 1, wherein the roughness corresponding to the quality 2B or 2D of the international classification for stainless steel is transferred. 請求項１記載の焼鈍方法を実施するための焼鈍装置であって、
上記ステンレス鋼帯を還元性雰囲気中で加熱する手段（２）、
上記ステンレス鋼帯を冷却する手段（２）、
上記ステンレス鋼帯の表面に粗さを転写する手段（２３）
を含むことを特徴とする焼鈍装置。 An annealing apparatus for carrying out the annealing method according to claim 1,
Means (2) for heating the stainless steel strip in a reducing atmosphere;
Means (2) for cooling the stainless steel strip,
Means for transferring roughness to the surface of the stainless steel strip (23)
An annealing apparatus comprising: 請求項６において、上記ステンレス鋼帯の表面に粗さを転写する手段が、少なくとも1対の粗面ロール（２３）を含む圧延装置で構成されることを特徴とする焼鈍装置。   7. An annealing apparatus according to claim 6, wherein the means for transferring the roughness to the surface of the stainless steel strip comprises a rolling device including at least one pair of rough surface rolls (23). 請求項６において、上記加熱する手段が、誘導加熱手段としての縦型炉（２）で構成されることを特徴とする焼鈍装置。   7. An annealing apparatus according to claim 6, wherein said heating means comprises a vertical furnace (2) as induction heating means. 請求項６において、上記冷却する手段が、冷却ガスを循環する手段を含むことを特徴とする焼鈍装置。   7. An annealing apparatus according to claim 6, wherein said cooling means includes means for circulating a cooling gas. 請求項６において、上記縦型炉が、下記要素：
入側シール手段、
上記ステンレス鋼帯の張力を制御および測定する手段、
上記ステンレス鋼帯の張力を調節する作動手段、
横磁束誘導加熱手段、
冷却手段、
出側シール手段
の全部または一部を備えていることを特徴とする焼鈍装置。 The vertical furnace according to claim 6, wherein the vertical furnace includes the following elements:
Entry side sealing means,
Means for controlling and measuring the tension of the stainless steel strip,
Operating means for adjusting the tension of the stainless steel strip,
Transverse magnetic induction heating means,
Cooling means,
An annealing apparatus comprising all or part of the outlet side sealing means. 請求項６において、ステンレス鋼帯の粗さを測定する手段と、粗面ロールの転写圧力を制御できる作動手段とを更に備えていることを特徴とする焼鈍装置。   7. An annealing apparatus according to claim 6, further comprising means for measuring the roughness of the stainless steel strip and operating means capable of controlling the transfer pressure of the rough surface roll. 請求項１記載の焼鈍方法を、圧延過程において、上記ステンレス鋼帯を軟化して延性を回復させるための中間焼鈍工程（４）として使用すること。   The annealing method according to claim 1 is used as an intermediate annealing step (4) for softening the stainless steel strip and restoring ductility in the rolling process. 請求項１記載の焼鈍方法を、圧延過程において、最終焼鈍工程として使用すること。   The annealing method according to claim 1 is used as a final annealing step in a rolling process.
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