JP3087639B2 - Manufacturing method of high hardness austenitic stainless steel sheet - Google Patents
Manufacturing method of high hardness austenitic stainless steel sheetInfo
- Publication number
- JP3087639B2 JP3087639B2 JP08003225A JP322596A JP3087639B2 JP 3087639 B2 JP3087639 B2 JP 3087639B2 JP 08003225 A JP08003225 A JP 08003225A JP 322596 A JP322596 A JP 322596A JP 3087639 B2 JP3087639 B2 JP 3087639B2
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- Prior art keywords
- rolling
- hardness
- temperature
- steel sheet
- target
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- Heat Treatment Of Steel (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は、板ばね等に使用さ
れる高硬度のオーステナイト系ステンレス鋼板の製造方
法に係わり、更に詳しくは一定板厚の母材鋼板から任意
の板厚、硬度の製品を圧延により製造する方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a high-hardness austenitic stainless steel sheet used for a leaf spring or the like, and more particularly, to a product having an arbitrary thickness and hardness from a base steel sheet having a constant thickness. And a method for producing the same by rolling.
【0002】[0002]
【従来の技術】SUS304やSUS301等のオース
テナイト系ステンレス鋼は、冷間圧延すると加工誘起マ
ルテンサイトが生成し、著しく加工硬化する。そのた
め、非常に高い硬度を得ることができ、高級バネ用材料
等、高強度材料として用いられている。2. Description of the Related Art Austenitic stainless steels such as SUS304 and SUS301 are cold-rolled to form work-induced martensite and are significantly work-hardened. Therefore, a very high hardness can be obtained, and it is used as a high-strength material such as a high-grade spring material.
【0003】冷間圧延によって製品硬度を目標値に制御
する一般的な方法としては、焼鈍後に最終仕上げ冷間圧
延を行う際に、母材板厚から目標板厚までの圧下率を製
品硬度に応じて変化させて冷間圧延する方法がある。と
ころが、この方法では下記のような問題点があった。[0003] As a general method of controlling the product hardness to a target value by cold rolling, when final finishing cold rolling is performed after annealing, the rolling reduction from the base material thickness to the target thickness is set to the product hardness. There is a method in which cold rolling is performed by changing according to the conditions. However, this method has the following problems.
【0004】1)製品硬度毎に圧下率が異なるために、
製品硬度に応じて最終仕上げ冷間圧延前の母材板厚を変
化させる必要があり、製造工程が複雑になる。[0004] 1) Since the rolling reduction differs for each product hardness,
It is necessary to change the base material thickness before final finish cold rolling according to the product hardness, which complicates the manufacturing process.
【0005】2)冷間圧延時に生成する加工誘起マルテ
ンサイト(以下α´と記す)量が製品硬度に大きく影響
するが、α´は鋼成分、圧下率および圧延温度により大
きく変化するため製品硬度に大きなバラツキが生じ、目
標硬度に的中させるのが困難である。[0005] 2) The amount of work-induced martensite (hereinafter referred to as α ') generated during cold rolling greatly affects the product hardness, but α' varies greatly depending on the steel composition, rolling reduction, and rolling temperature. Large variation occurs, and it is difficult to hit the target hardness.
【0006】上記2)の問題を解決する方法として、特
開昭62−199214号公報に各パスの圧延速度と圧
下量とを操作因子として、各パスにおける入側と出側の
α´量、板厚、材料温度の計測情報、及び圧延速度、圧
下量、圧延油温度の圧延情報に基づき製品硬度を制御す
る方法が開示されている。As a method for solving the above problem 2), Japanese Patent Application Laid-Open No. 62-199214 discloses a method in which the rolling speed and rolling reduction of each pass are used as operating factors, and the α ′ amount on the entrance side and the exit side in each pass, A method of controlling product hardness based on measurement information of a sheet thickness and a material temperature and rolling information of a rolling speed, a rolling reduction, and a rolling oil temperature is disclosed.
【0007】また、特開昭54−81120号公報に
は、製品硬度のバラツキの低減、圧延効率の向上を目的
とし、圧延油の温度を30℃未満にしてミルに供給し、
MS 点(マルテンサイト変態開始温度)と成分組成との
関係式、MS 点と冷間圧延での圧下率との相関及びMS
点と圧延速度との相関とを予め求めておき、目標製品硬
度に応じて材料の成分組成、冷間圧延圧下率及び圧延速
度を定めて冷間圧延する方法が開示されている。Further, Japanese Patent Application Laid-Open No. 54-81120 discloses a method in which the temperature of a rolling oil is supplied to a mill at a temperature of less than 30 ° C. for the purpose of reducing variation in product hardness and improving rolling efficiency.
Relation of M S point (martensitic transformation starting temperature) and component composition, correlation with the rolling reduction in M S point and cold rolling and M S
There is disclosed a method in which a correlation between a point and a rolling speed is obtained in advance, and a cold rolling is performed by determining a component composition of a material, a cold rolling reduction and a rolling speed according to a target product hardness.
【0008】[0008]
【発明が解決しようとする課題】しかしながら、上記特
開昭62−199214号公報に開示されている冷間圧
延方法は、製品硬度を目標値に的中させるために、圧下
率、圧延速度を制御しているので、圧延機の有している
能力を犠牲にして冷間圧延を遂行することになる。従っ
て、圧延能率が著しく低下し、生産性が大きく損なわれ
ることになる。However, the cold rolling method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 62-199214 controls the rolling reduction and the rolling speed in order to hit the product hardness to the target value. Therefore, the cold rolling is performed at the expense of the capability of the rolling mill. Therefore, the rolling efficiency is significantly reduced, and the productivity is greatly impaired.
【0009】特開昭54−81120号公報に記載され
ている冷間圧延方法は、圧延効率、、製品硬度の安定化
の改善効果がある程度得られるものの、製品硬度毎に鋼
成分を変えなければならず、また最終圧延前の素材板厚
を変えなければならないこと等の点から、多品種、少量
生産には適さない。また、α´の生成に大きく影響する
圧延温度の検討がなされていない。The cold rolling method described in Japanese Patent Application Laid-Open No. 54-81120 can improve the rolling efficiency and the stabilization of the product hardness to some extent, but the steel composition must be changed for each product hardness. In addition, it is not suitable for high-mix, low-volume production, because the material thickness before final rolling must be changed. Further, no study has been made on the rolling temperature that greatly affects the formation of α ′.
【0010】本発明は、最終仕上げ圧延前の母材鋼板の
板厚を種々変更することなく、各種目標とする板厚、硬
度を有する製品を圧延により精度よく製造する方法を提
供することを目的とする。[0010] It is an object of the present invention to provide a method for accurately producing a product having various target sheet thicknesses and hardness by rolling without variously changing the sheet thickness of the base steel sheet before final finish rolling. And
【0011】[0011]
【課題を解決するための手段】本発明者らは、オーステ
ナイト系ステンレス鋼の圧延時に硬度を制御する方法に
つき種々実験検討を重ねた結果、次のような知見を得
た。Means for Solving the Problems The present inventors have conducted various experimental studies on a method of controlling the hardness of austenitic stainless steel during rolling, and have obtained the following findings.
【0012】製品の硬度は冷間圧延時に生成するα´量
により大きく変動するが、α´量は加工時の材料温度に
よりその生成量が大きく変化するので、冷間圧延時の材
料温度を制御すれば、圧延能力をフルに発揮した圧延を
実施しても製品硬度を目標値に的中することができ、ま
た冷間圧延前の同一の母材板厚から任意の製品硬度を得
ることも可能となる。従って、最終仕上げ圧延に供する
母材の製造工程を大幅に簡略化することができる。[0012] The hardness of a product greatly varies depending on the amount of α 'generated during cold rolling. However, since the amount of α' varies greatly depending on the material temperature during processing, the material temperature during cold rolling is controlled. By doing so, it is possible to hit the product hardness to the target value even if rolling is performed to the fullest of the rolling capacity, and it is also possible to obtain any product hardness from the same base material thickness before cold rolling. It becomes possible. Therefore, the manufacturing process of the base material to be subjected to the final finish rolling can be greatly simplified.
【0013】本発明は、このような知見に基づきなされ
たもので、その要旨は、「一定厚さのオーステナイト系
ステンレス鋼板から目的の任意の製品板厚に圧延して、
任意の目標硬度を付与する高硬度オーステナイト系ステ
ンレス鋼板の製造方法であって、予め、圧延するオース
テナイト系ステンレス鋼の圧延温度と圧下率と硬度との
相関関係を求めておき、その相関関係に基づいて最終パ
スで目的の板厚と硬度になるように圧延パス回数、目標
の各パスの圧延温度、圧下率及び各パス後の硬度とを決
定して圧延することを特徴とする高硬度オーステナイト
系ステンレス鋼板の製造方法」にある。The present invention has been made on the basis of such knowledge, and the gist of the invention is that "rolling an austenitic stainless steel plate having a constant thickness to a desired product thickness,
A method for producing a high-hardness austenitic stainless steel sheet for providing an arbitrary target hardness, in which a correlation between a rolling temperature, a rolling reduction, and a hardness of an austenitic stainless steel to be rolled is determined in advance, and based on the correlation. High hardness austenitic system characterized in that the number of rolling passes, target rolling temperature, rolling reduction and hardness after each pass are determined and rolled so that the target plate thickness and hardness are obtained in the final pass. Method of manufacturing stainless steel sheet ".
【0014】[0014]
【発明の実施の形態】図1は、本発明を実施するための
圧延設備の一例を示したものである。この設備は、6段
のリバース圧延機3を中心に左右対称な設備になってい
る。同図の左側から右側に圧延する場合、巻出しリール
2で巻出された鋼板1は、電極5から鋼板に直接通電し
て加熱する装置4で所定の温度に加熱される。FIG. 1 shows an example of a rolling facility for carrying out the present invention. This equipment is a symmetrical equipment centered on a six-stage reverse rolling mill 3. When rolling from the left side to the right side in the drawing, the steel sheet 1 unwound by the unwinding reel 2 is heated to a predetermined temperature by a device 4 for heating by directly energizing the steel sheet from the electrode 5.
【0015】加熱装置4としては、直接通電加熱、誘導
加熱、還元ガス加熱等があるが、設備コストが安価で加
熱効率が良く、設置スペースの問題もなく、被圧延材の
温度を瞬時に任意の温度に変更することが可能な直接通
電加熱装置が望ましい。As the heating device 4, there are direct current heating, induction heating, reducing gas heating, etc., but the equipment cost is low, the heating efficiency is good, there is no problem of the installation space, and the temperature of the material to be rolled can be instantaneously set. It is desirable to use a direct current heating device capable of changing the temperature to the above range.
【0016】加熱装置4の加熱温度は、温度センサ6で
得られた加熱後の鋼板の温度情報に基づき、鋼板が目標
温度になるように制御することが可能となっている。The heating temperature of the heating device 4 can be controlled based on the temperature information of the heated steel sheet obtained by the temperature sensor 6 so that the steel sheet reaches the target temperature.
【0017】加熱された鋼板は、圧延機3に入る直前で
図示しないノズルで圧延油が供給され、圧延機により目
標板厚に圧延される。圧延された鋼板は冷却装置7´で
冷却され巻取りリール2´で巻取られる。圧延が終わり
巻取られた鋼板は、リール2´より巻戻され、加熱装置
4´で加熱され2パス目の圧延が行われる。このように
複数回繰返し圧延を行い目標の板厚に仕上げられ製品と
なる。Immediately before entering the rolling mill 3, the heated steel sheet is supplied with rolling oil by a nozzle (not shown), and is rolled to a target thickness by the rolling mill. The rolled steel sheet is cooled by a cooling device 7 'and wound up by a take-up reel 2'. The rolled steel sheet after rolling is unwound from the reel 2 ′, heated by the heating device 4 ′, and rolled in the second pass. In this manner, the product is repeatedly rolled a plurality of times and finished to a target thickness.
【0018】圧延後の硬度は、圧延温度に大きく影響さ
れる。すなわち、圧延温度によりα´の生成量は大きく
変化し、低温になるほど生成量が多くなる。従って、圧
延時の温度を適切に制御することにより、目標とする製
品硬度を得ることが可能となる。圧延温度は、母材鋼板
の板厚、パス回数及び目標製品硬度により異なるので限
定はしないが、200℃以上になるとヒートスクラッチ
が発生する恐れがあるので200℃以下にするのが好ま
しい。The hardness after rolling is greatly affected by the rolling temperature. That is, the production amount of α ′ varies greatly depending on the rolling temperature, and the production amount increases as the temperature decreases. Therefore, a target product hardness can be obtained by appropriately controlling the temperature during rolling. The rolling temperature is not limited because it varies depending on the thickness of the base steel sheet, the number of passes, and the target product hardness. However, if the temperature exceeds 200 ° C., heat scratches may occur, so the rolling temperature is preferably 200 ° C. or less.
【0019】次に、圧延温度と圧下率及び硬度との相関
関係について説明する。Next, the correlation between the rolling temperature, the rolling reduction, and the hardness will be described.
【0020】図2は、SUS301を常温で、圧下率を
種々変化させて圧延したときの変形抵抗と硬さの関係を
調査した結果を示したものであり、変形抵抗と硬さの間
には非常によい相関があることが分かる。最終圧延パス
終了時の変形抵抗値が予想できれば、製品硬度を図2か
ら逆に求めることが可能になる。FIG. 2 shows the results of an examination of the relationship between deformation resistance and hardness when SUS301 is rolled at room temperature with various rolling reductions, and the relationship between deformation resistance and hardness is shown. It turns out that there is a very good correlation. If the deformation resistance value at the end of the final rolling pass can be predicted, the product hardness can be obtained in reverse from FIG.
【0021】そこで、本発明者らは変形抵抗について、
圧延温度、圧下率との関係を詳細に調査、検討した結
果、下記式により精度良く変形抵抗を推定できることを
見出した。Therefore, the present inventors have described the deformation resistance.
As a result of investigating and examining the relationship between the rolling temperature and the rolling reduction in detail, it was found that the deformation resistance can be accurately estimated by the following equation.
【0022】[0022]
【数1】 (Equation 1)
【0023】[0023]
【数2】 (Equation 2)
【0024】[0024]
【数3】 (Equation 3)
【0025】[0025]
【数4】 (Equation 4)
【0026】[0026]
【数5】 (Equation 5)
【0027】[0027]
【数6】 (Equation 6)
【0028】ここで、 σ:変形抵抗 ε:相当歪[ε=1.15ln(出側板厚/母材板厚) ] T:材料温度 とする。また、a1,a2,a3,b1,b2,c1,c2,c3,d1,d2,η1,η
2,B は係数であり、軽圧下、多パスの圧延試験で得られ
たマルテンサイト生成量及び圧延材の引張試験で得られ
た結果を回帰して予め求めておく。これらは成分によっ
て異なってくるが、代表的なオーステナイト系ステンレ
ス鋼であるSUS301鋼板について、回帰により求め
た結果を表1示す。Here, σ: deformation resistance ε: equivalent strain [ε = 1.15 ln (outside plate thickness / base metal plate thickness)] T: material temperature A 1 , a 2 , a 3 , b 1 , b 2 , c 1 , c 2 , c 3 , d 1 , d 2 , η 1 , η
2 and B are coefficients, which are obtained in advance by regression of the amount of martensite formed in a multi-pass rolling test under light pressure and the results obtained in a tensile test of a rolled material. Although these vary depending on the components, Table 1 shows the results obtained by regression on SUS301 steel plate, which is a typical austenitic stainless steel.
【0029】[0029]
【表1】 [Table 1]
【0030】上記σA はオーステナイト相の変形抵抗、
σM はマルテンサイト相の変形抵抗、σ0 はオーステナ
イト相の初期変形抵抗、Mはマルテンサイト生成率であ
る。The above σ A is the deformation resistance of the austenite phase,
σ M is the deformation resistance of the martensite phase, σ 0 is the initial deformation resistance of the austenite phase, and M is the martensite generation rate.
【0031】このように、圧延中の材料温度、相当歪を
知ることにより式(1)〜(6)から1パス後の変形抵
抗を精度良く知ることができる。すなわち、圧延温度、
相当歪(圧下率)を決めると、変形抵抗(硬度)を予測
することができる。Thus, by knowing the material temperature during rolling and the equivalent strain, it is possible to accurately know the deformation resistance after one pass from equations (1) to (6). That is, rolling temperature,
Determining the equivalent strain (reduction ratio) allows prediction of the deformation resistance (hardness).
【0032】従って、圧延パススケジュールで1パス毎
に圧延温度、圧下率、硬度を任意に設定できるので、母
材鋼板の板厚と目標製品板厚とを一定にして、種々の硬
度を付与することが可能となる。更に、圧延速度も全パ
ス最高の圧延速度にすることも可能となり、高能率圧延
が実現できる。Therefore, the rolling temperature, rolling reduction, and hardness can be arbitrarily set for each pass in the rolling pass schedule, so that the thickness of the base steel sheet and the target product thickness are kept constant to give various hardnesses. It becomes possible. Furthermore, the rolling speed can be set to the highest rolling speed in all passes, and high-efficiency rolling can be realized.
【0033】パス回数、目標の各パス毎の圧延温度、圧
下率、硬度を決定する方法について以下に説明する。The method of determining the number of passes, the target rolling temperature, rolling reduction, and hardness for each pass will be described below.
【0034】本発明の方法では、圧延機の能力範囲内で
パス回数は何回に設定しても、圧延温度を制御すること
により目標の製品硬度を得ることができるが、圧延効率
を高めるためにはパス回数は少なければ少ないほどよ
い。すなわち、パス回数は各パスの圧下率により決ま
り、その圧下率は圧延機の許容最大圧延荷重と最大トル
クから決定すればよい。In the method of the present invention, the target product hardness can be obtained by controlling the rolling temperature, no matter how many times the number of passes is set within the capacity range of the rolling mill. The smaller the number of passes, the better. That is, the number of passes is determined by the rolling reduction of each pass, and the rolling reduction may be determined from the allowable maximum rolling load and the maximum torque of the rolling mill.
【0035】各パスでの圧延温度、圧下率、硬度は、前
記式(1)〜(6)を、一般に知られている冷間圧延荷
重式に組み込んだ圧延解析シミュレータにより決定す
る。このシミュレータは、圧延中の冷却による温度低下
量、加工発熱量等の温度計算も考慮したモデルである。
目標硬度、圧下率を入力すると、その条件を満たす圧延
温度を算出し、圧延前に必要な加熱温度が表示される。
例えば、次のようにして目標の各パスでの圧延温度、圧
下率及び硬度を決めることができる。The rolling temperature, rolling reduction, and hardness in each pass are determined by a rolling analysis simulator incorporating the above formulas (1) to (6) into a generally known cold rolling load formula. This simulator is a model that also takes into account temperature calculations such as the amount of temperature decrease due to cooling during rolling and the amount of heat generated during processing.
When the target hardness and the rolling reduction are input, a rolling temperature satisfying the conditions is calculated, and a heating temperature required before rolling is displayed.
For example, the rolling temperature, rolling reduction, and hardness in each target pass can be determined as follows.
【0036】最終製品硬度が得られるパス回数を決定
する。The number of passes to obtain the final product hardness is determined.
【0037】各パスの目標硬度を仮定する。Assume a target hardness for each pass.
【0038】初期条件として、1パスの硬度を、(最終
製品の目標硬度−175)/(パス回数)+175と仮
定する。As an initial condition, it is assumed that the hardness of one pass is (target hardness of final product−175) / (number of passes) +175.
【0039】175は、圧延前の母材鋼板の硬度次
に、加工硬化を考慮して圧下率を初期パスを最も大きく
し、パスが進むにつれ減少するように仮定する。175 is the hardness of the base steel sheet before rolling. Next, it is assumed that the rolling reduction is maximized in the initial pass in consideration of work hardening and is reduced as the pass progresses.
【0040】上記、の仮定が終わると、前記式
(1)〜(6)の変形抵抗の式を組み込んだ圧延解析シ
ミュレータにより各パスの目標硬度になるための圧延温
度を算出し、その温度でで求めた圧下率での圧延を行
った場合の圧延荷重、トルクを算出する。When the above assumptions are completed, the rolling temperature for achieving the target hardness of each pass is calculated by a rolling analysis simulator incorporating the deformation resistance formulas of the above formulas (1) to (6). Calculate the rolling load and torque when rolling is performed at the rolling reduction determined in the above.
【0041】算出した圧延荷重、トルクが定められた
圧延機の能力を超えている場合には、、の目標硬
度、圧下率を修正する。If the calculated rolling load and torque exceed the determined rolling mill capacity, the target hardness and rolling reduction are corrected.
【0042】上記〜を繰り返して、各パスの圧下
率、圧延温度を決定する。By repeating the above, the rolling reduction and rolling temperature of each pass are determined.
【0043】表2に示した仕様の圧延機を用いて、母材
板厚が0.6mmのSUS301鋼板を母材とし、目標
板厚を0.3mm、目標硬度をHv400とした場合に
おける、3パス圧延による各パスでの圧延条件を計算し
て求めた1例を表3に示す。Using a rolling mill having the specifications shown in Table 2, a SUS301 steel plate having a base material thickness of 0.6 mm was used as a base material, and a target thickness of 0.3 mm and a target hardness of Hv400 were used. Table 3 shows an example obtained by calculating rolling conditions in each pass by pass rolling.
【0044】表3のパススケジュールで表2に示す仕様
の圧延機で図1に示したラインにより圧延を実施した結
果、最終製品の硬度は398となり、ほぼ目標値に近い
硬度となった。As a result of rolling by the rolling mill having the specifications shown in Table 2 by the rolling schedule shown in Table 2 in the pass schedule shown in Table 3, the hardness of the final product was 398, which was almost the target value.
【0045】[0045]
【表2】 [Table 2]
【0046】[0046]
【表3】 [Table 3]
【0047】このように、圧延効率を最高にして圧延を
行った場合も材料温度を精度良く制御する事により、最
終製品硬度を目標値に的中させることができる。また、
同一母材板厚からでも上記解析モデルを用いて加熱温度
を最適に設定することにより、最終製品硬度を任意に変
更することも可能になる。As described above, even when the rolling is performed with the highest rolling efficiency, the final product hardness can be hit to the target value by accurately controlling the material temperature. Also,
By setting the heating temperature optimally using the above analysis model even from the same base material plate thickness, the final product hardness can be arbitrarily changed.
【0048】[0048]
【実施例】表4に示す化学組成の板厚0.6mm、板幅
700mmのSUS301鋼板を用いて、目標硬度をH
v400、460、520の3つに設定し、目標板厚
0.3mmまで図1に示す圧延ラインで表2に示す仕様
の圧延機により圧延した。EXAMPLE A SUS301 steel plate having a chemical composition shown in Table 4 and having a thickness of 0.6 mm and a width of 700 mm was used.
v400, 460, and 520 were set, and rolling was performed by a rolling mill having the specifications shown in Table 2 on the rolling line shown in FIG.
【0049】[0049]
【表4】 [Table 4]
【0050】本発明例として、前記した方法により求め
た表5に示す圧延パス回数、各パスでの圧下率、圧延温
度で圧延を実施した。また、比較例として表5に示す圧
延条件で通常の冷間圧延を行った。冷間圧延では、目標
硬度が高くなると圧下率も高くする必要があるため、母
材板厚も厚くしなければならないので、比較例では表5
示すように3種の板厚の鋼板を用いた。As an example of the present invention, rolling was performed at the number of rolling passes, rolling reduction in each pass, and rolling temperature shown in Table 5 obtained by the above-described method. As a comparative example, ordinary cold rolling was performed under the rolling conditions shown in Table 5. In the cold rolling, when the target hardness increases, the rolling reduction also needs to be increased. Therefore, the base material plate thickness must be increased.
As shown, steel plates of three different thicknesses were used.
【0051】圧延後、各鋼板のビッカース硬度及び板厚
を測定し、その結果を表5に併せて示す。After rolling, the Vickers hardness and the thickness of each steel sheet were measured, and the results are shown in Table 5.
【0052】[0052]
【表5】 [Table 5]
【0053】同表の本発明例に示すように、圧延中の材
料温度を制御することによって母材板厚0.6mmから
目標板厚0.3mmに冷間圧延して、目標とした3つの
製品硬度をほぼ満足する鋼板が得られた。このことか
ら、本発明により同一の板厚の冷間圧延前の母材から任
意の製品硬度が得られることが分かる。また、本発明で
は、圧延速度も全パス最高圧延速度で冷間圧延してお
り、圧延速度に制約されることがないので生産性も著し
く向上する。As shown in the example of the present invention in the same table, by controlling the material temperature during rolling, the base material was cold-rolled from a thickness of 0.6 mm to a target thickness of 0.3 mm, and the target three A steel sheet almost satisfying the product hardness was obtained. From this, it is understood that an arbitrary product hardness can be obtained from the base material having the same thickness before cold rolling according to the present invention. Further, in the present invention, the rolling speed is cold-rolled at the maximum rolling speed in all passes, and the rolling speed is not restricted, so that the productivity is remarkably improved.
【0054】鋼板を加熱せずに冷間圧延した比較例で
は、目標の製品硬度により母材の板厚を変化させねばな
らないので、また圧延速度も本発明例と比較すると低速
となり、パス回数も多くなり、圧延効率が悪化する。更
に、比較例における最終製品硬度も、目標値に対してバ
ラツキが大きいことが分かる。In the comparative example in which the steel sheet was cold-rolled without heating, the thickness of the base material had to be changed according to the target product hardness, so that the rolling speed was lower and the number of passes was lower than in the present invention. And the rolling efficiency deteriorates. Further, it can be seen that the final product hardness in the comparative example also has a large variation with respect to the target value.
【0055】[0055]
【発明の効果】本発明例によれば、同一の圧延母材板厚
から任意の製品硬度を得ることが可能となり、圧延パス
回数を大幅に少なくすることができる。また、圧延速度
も制約されることなく高速にできるため、圧延能率が著
しく向上し、大幅な生産性の向上が図れる。さらに、製
品硬度のバラツキも小さいので、歩留まりも著しく改善
することができる。According to the present invention, it is possible to obtain an arbitrary product hardness from the same rolled base material sheet thickness, and it is possible to greatly reduce the number of rolling passes. In addition, since the rolling speed can be increased without restriction, the rolling efficiency is significantly improved, and the productivity can be significantly improved. Further, since the variation in the product hardness is small, the yield can be remarkably improved.
【図1】本発明に用いる圧延ラインの一例を示した図で
ある。FIG. 1 is a diagram showing an example of a rolling line used in the present invention.
【図2】鋼板の変形抵抗と硬度の相関を示した図ある。FIG. 2 is a diagram showing a correlation between deformation resistance and hardness of a steel sheet.
1 鋼板 2、2´リ−ル 3 圧延機 4、4´加熱装置 5、5´電極 6、6´温度センサー 7、7´冷却装置 DESCRIPTION OF SYMBOLS 1 Steel plate 2, 2 'reel 3 Rolling machine 4, 4' heating device 5, 5 'electrode 6, 6' Temperature sensor 7, 7 'cooling device
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平3−128108(JP,A) 特公 平7−102378(JP,B2) (58)調査した分野(Int.Cl.7,DB名) B21B 37/00 B21B 3/02 C21D 8/02 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-128108 (JP, A) JP-B-7-102378 (JP, B2) (58) Fields investigated (Int. Cl. 7 , DB name) B21B 37/00 B21B 3/02 C21D 8/02
Claims (1)
板から、目的の製品板厚に圧延して、所定の目標硬度を
付与する高硬度オーステナイト系ステンレス鋼板の製造
方法であって、予め、圧延するオーステナイト系ステン
レス鋼の圧延温度と圧下率と硬度との相関関係を求めて
おき、その相関関係に基づいて圧延最終パスで目的の板
厚と硬度になるように圧延パス回数、目標の各パスの圧
延温度、圧下率及び各パス後の硬度とを決定して圧延す
ることを特徴とする高硬度オーステナイト系ステンレス
鋼板の製造方法。1. A method for producing a high-hardness austenitic stainless steel sheet which is rolled from an austenitic stainless steel sheet having a constant thickness to a target product sheet thickness to give a predetermined target hardness. The correlation between the rolling temperature, rolling reduction, and hardness of the series stainless steel is determined in advance, and based on the correlation, the number of rolling passes so that the target thickness and hardness are achieved in the final rolling pass, and rolling of each target pass A method for producing a high-hardness austenitic stainless steel sheet, comprising determining a temperature, a reduction ratio, and hardness after each pass and rolling.
Priority Applications (1)
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---|---|---|---|
JP08003225A JP3087639B2 (en) | 1996-01-11 | 1996-01-11 | Manufacturing method of high hardness austenitic stainless steel sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP08003225A JP3087639B2 (en) | 1996-01-11 | 1996-01-11 | Manufacturing method of high hardness austenitic stainless steel sheet |
Publications (2)
Publication Number | Publication Date |
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JPH09192712A JPH09192712A (en) | 1997-07-29 |
JP3087639B2 true JP3087639B2 (en) | 2000-09-11 |
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JP08003225A Expired - Lifetime JP3087639B2 (en) | 1996-01-11 | 1996-01-11 | Manufacturing method of high hardness austenitic stainless steel sheet |
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JP4641099B2 (en) * | 2000-12-27 | 2011-03-02 | 日新製鋼株式会社 | Manufacturing method of high strength austenitic stainless steel sheet |
KR101447096B1 (en) * | 2013-05-21 | 2014-10-07 | 한국생산기술연구원 | Electric rolling apparatus |
CN110849928B (en) * | 2019-10-17 | 2022-05-03 | 浙江工业大学 | Ultrasonic rolling processing temperature measurement analysis method |
CN113695847A (en) * | 2021-08-12 | 2021-11-26 | 江苏钜顺链业科技有限公司 | Production method of stainless steel hoisting gourd chain |
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