JPH0841550A - Production of austenitic stainless steel sheet or steel strip small in anisotropy - Google Patents
Production of austenitic stainless steel sheet or steel strip small in anisotropyInfo
- Publication number
- JPH0841550A JPH0841550A JP17701294A JP17701294A JPH0841550A JP H0841550 A JPH0841550 A JP H0841550A JP 17701294 A JP17701294 A JP 17701294A JP 17701294 A JP17701294 A JP 17701294A JP H0841550 A JPH0841550 A JP H0841550A
- Authority
- JP
- Japan
- Prior art keywords
- hot
- rolling
- austenitic stainless
- anisotropy
- rolled sheet
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はオーステナイト系ステン
レス鋼板または鋼帯の製造方法に関し、熱間圧延、焼鈍
後の鋼板または鋼帯の冷間圧延および最終焼鈍を省略
し、かつ従来の製品と同等以上の加工性を有し、特に面
内異方性の小さい特性を有するオーステナイト系ステン
レス鋼板または鋼帯の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an austenitic stainless steel sheet or strip, omitting hot rolling, cold rolling and final annealing of a steel sheet or strip after annealing, and equivalent to conventional products. The present invention relates to a method for producing an austenitic stainless steel plate or steel strip having the above-described workability, and particularly having a characteristic of having small in-plane anisotropy.
【０００２】[0002]
【従来の技術】ＳＵＳ３０４鋼に代表されるオーステナ
イト系ステンレス鋼薄板は、従来から、電気炉によるス
ラブ溶製後、熱間圧延を行って熱延板を製造し、その後
熱延焼鈍、デスケーリングを行った後、冷間圧延、最終
焼鈍を経て冷延板製品として製造されている。2. Description of the Related Art Conventionally, an austenitic stainless steel thin plate represented by SUS304 steel has been manufactured by hot rolling after hot-rolling by hot rolling after slab melting by an electric furnace. After that, it is manufactured as a cold-rolled sheet product through cold rolling and final annealing.
【０００３】冷間圧延の主な目的は、薄板製品のために
製品板厚を高精度で制御すること、表面性状を向上させ
外観の優れた製品にすることなどである。しかしながら
高い表面性状や板厚精度が要求されない製品であれば、
冷間圧延工程、最終焼鈍工程を省略できるために、省工
程による生産性の著しい向上が期待される。The main purpose of cold rolling is to control the product sheet thickness with high precision for a thin plate product, to improve the surface properties, and to make the product excellent in appearance. However, if the product does not require high surface quality and plate thickness accuracy,
Since the cold rolling process and the final annealing process can be omitted, it is expected that the productivity will be significantly improved by saving the process.
【０００４】一方、従来のような熱間圧延や冷間圧延で
は、熱延板や冷延板製品の機械的性質に大きな面内異方
性が生じるため、例えばイアリングが大きく発生し、材
料歩留を低下させる原因となっている。On the other hand, in conventional hot rolling or cold rolling, a large in-plane anisotropy occurs in the mechanical properties of the hot-rolled sheet or the product of the cold-rolled sheet. It is a cause of lowering the retention.
【０００５】従来、このようなオーステナイト系ステン
レス鋼板の面内異方性を制御する方法が特開昭５２−２
８４２４号公報、および特開昭６１−２４６３２３号公
報に開示されている。Conventionally, a method for controlling the in-plane anisotropy of such an austenitic stainless steel sheet is disclosed in Japanese Patent Laid-Open No. 52-2.
It is disclosed in Japanese Patent No. 8424 and Japanese Patent Laid-Open No. 61-246323.
【０００６】しかしながら、特開昭５２−２８４２４号
公報に開示された技術は、熱延板焼鈍を省略して冷間圧
延することにより圧延方向に対して４５°方向のｒ値を
向上させ、むしろ機械的性質の面内異方性を大きくしよ
うというものである。However, the technique disclosed in JP-A-52-28424 improves the r-value in the direction of 45 ° with respect to the rolling direction by omitting hot-rolled sheet annealing and performing cold rolling. The purpose is to increase the in-plane anisotropy of mechanical properties.
【０００７】また、特開昭６１−２４６３２３号公報に
開示された技術は、熱延板焼鈍を省略して冷間圧延する
ことにより機械的性質の面内異方性を小さくするもので
あるが、対象はあくまでも冷延板であり熱延板における
機械的性質の面内異方性は考慮されていない。Further, the technique disclosed in Japanese Patent Laid-Open No. 61-246323 reduces the in-plane anisotropy of mechanical properties by omitting hot-rolled sheet annealing and performing cold rolling. However, the object is only a cold rolled sheet, and the in-plane anisotropy of mechanical properties in the hot rolled sheet is not taken into consideration.
【０００８】[0008]
【発明が解決しようとする課題】本発明はかかる事情に
鑑みてなされたものであって、熱延板焼鈍、焼鈍後の冷
間圧延および最終焼鈍を省略した熱延板状態で、従来と
同等以上の加工性を有し、特に機械的性質の面内異方性
の小さいオーステナイト系ステンレス鋼板または鋼帯の
製造方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is equivalent to the conventional one in a hot rolled sheet state in which hot rolled sheet annealing, cold rolling after annealing and final annealing are omitted. It is an object of the present invention to provide a method for producing an austenitic stainless steel plate or steel strip having the above-mentioned workability and having particularly small in-plane anisotropy of mechanical properties.
【０００９】[0009]
【課題を解決するための手段および作用】本発明は、上
記課題を解決するために、オーステナイト系ステンレス
鋼のスラブを１２００℃以上１３００℃以下の温度範囲
に加熱し、熱間粗圧延後、熱間仕上圧延を９４０℃以上
で終了し、９６０〜１２００℃で熱延板焼鈍を行った
後、デスケーリングを施し、以下の式で示されるΔｒの
絶対値｜Δｒ｜が０．２０以下であることを特徴とす
る、異方性の小さいオーステナイト系ステンレス鋼板ま
たは鋼帯の製造方法を提供する。In order to solve the above problems, the present invention heats a slab of austenitic stainless steel to a temperature range of 1200 ° C. or higher and 1300 ° C. or lower, and after hot rough rolling, heat treatment is performed. The inter-finish rolling is finished at 940 ° C. or higher, the hot rolled sheet is annealed at 960 to 1200 ° C., descaling is performed, and the absolute value | Δr | of Δr represented by the following formula is 0.20 or less. The present invention provides a method for producing an austenitic stainless steel sheet or strip having small anisotropy, which is characterized by the above.
【００１０】Δｒ＝｛（ｒ0 ＋ｒ90）／２｝−ｒ45 ただし、ｒ0 ，ｒ90，ｒ45は、それぞれ圧延方向に対し
て０°、４５°、９０°の方向のランクフォード値を表
わす。Δr = {(r 0 + r 90 ) / 2} -r 45 where r 0 , r 90 and r 45 are Rankford values in the directions of 0 °, 45 ° and 90 ° with respect to the rolling direction, respectively. Represents
【００１１】以下、本発明について具体的に説明する。
本願発明者らは、各種オーステナイト系ステンレス鋼板
を用いて、｜Δｒ｜を指標として機械的性質の面内異方
性について検討した結果、｜Δｒ｜の大小つまり機械的
性質の面内異方性の大小は熱間圧延の圧延条件が強く影
響することを見出した。ここで、Δｒは圧延方向に対し
て０°、４５°、９０°の方向のランクフォード値をそ
れぞれｒ0 ，ｒ90，ｒ45と表わした場合に、以下に示す
式で表わされ、Δｒの絶対値｜Δｒ｜が小さいほど機械
的性質の面内異方性が小さい。The present invention will be specifically described below.
The inventors of the present application have studied the in-plane anisotropy of mechanical properties by using various austenitic stainless steel sheets and using | Δr | as an index. As a result, the magnitude of | Δr | It was found that the rolling condition of hot rolling has a strong influence on the size. Here, Δr is expressed by the following formula when the Rankford values in the directions of 0 °, 45 °, and 90 ° with respect to the rolling direction are expressed as r 0 , r 90 , and r 45 , respectively. The smaller the absolute value | Δr | of, the smaller the in-plane anisotropy of mechanical properties.
【００１２】Δｒ＝｛（ｒ0 ＋ｒ90）／２｝−ｒ45 すなわち、熱間圧延終了時にある程度再結晶が進行して
いると熱延板の異方性が小さくなる傾向がある。本発明
はこのような知見に基づいてなされたものであり、基本
的に以下のＡ〜Ｄの工程により、熱延板焼鈍、焼鈍後の
冷間圧延および最終焼鈍を省略した熱延板状態で、上記
Δｒの絶対値｜Δｒ｜が０．２０以下である異方性の小
さいオーステナイト系ステンレス鋼板または鋼帯を製造
するものである。Δr = {(r 0 + r 90 ) / 2} -r 45 That is, if recrystallization proceeds to some extent at the end of hot rolling, the anisotropy of the hot rolled sheet tends to decrease. The present invention has been made based on such knowledge, and basically, in the hot rolled sheet state in which the hot rolled sheet annealing, the cold rolling after annealing and the final annealing are omitted by the following steps A to D. , An anustenitic stainless steel sheet or steel strip having a small anisotropy in which the absolute value | Δr | of Δr is 0.20 or less is manufactured.
【００１３】（Ａ）オーステナイト系ステンレス鋼のス
ラブを１２００℃以上１３００℃以下の温度範囲に加熱
する。 （Ｂ）熱間粗圧延後、熱間仕上圧延を９４０℃以上で終
了する。(A) An austenitic stainless steel slab is heated to a temperature range of 1200 ° C. or higher and 1300 ° C. or lower. (B) After hot rough rolling, hot finish rolling is completed at 940 ° C. or higher.
【００１４】（Ｃ）９６０〜１２００℃で熱延板焼鈍を
行う。 （Ｄ）熱延板をデスケーリングする。 Ａ工程においては、オーステナイト系ステンレス鋼のス
ラブを１２００℃以上の温度に加熱するが、これは後述
するＢ工程において熱間仕上圧延の終了温度を９４０℃
以上にするために必須である。しかし、この温度が１３
００℃を超えるとデルタフェライトが急激に増加し、熱
間加工性を阻害し、肌荒れの原因となる。したがってス
ラブ加熱の上限は１３００℃とする。(C) Hot-rolled sheet annealing is performed at 960 to 1200 ° C. (D) Descaling the hot rolled sheet. In step A, the slab of austenitic stainless steel is heated to a temperature of 1200 ° C. or higher. This is because the finish temperature of hot finish rolling is 940 ° C. in step B described later.
It is essential for the above. However, this temperature is 13
If the temperature exceeds 00 ° C, the amount of delta ferrite sharply increases, hinders hot workability, and causes rough skin. Therefore, the upper limit of slab heating is 1300 ° C.
【００１５】Ｂ工程においては、熱間圧延終了時にある
程度再結晶を進行させて熱延板の異方性を小さくする観
点から、粗圧延を高温で行って結晶粒をできるだけ粗粒
化することが必要である。そのために、熱間仕上圧延の
終了温度を９４０℃以上に規定する。この温度が９４０
℃未満では再結晶が起こらないため、結晶粒が展伸粒化
した組織となり、異方性が大きくなる。これに対して、
この温度が９４０℃を超えると部分的に再結晶した結晶
粒が形成されはじめ、１０１０℃を超えると完全に再結
晶し、さらに高温になるにしたがって粒成長した組織と
なる。そして、上述したように熱間圧延終了時にある程
度再結晶が進行していると熱延板の異方性が小さくなる
傾向があるから、完全に再結晶する１０１０℃超えのみ
ならず、９４０〜１０１０℃の再結晶が部分的に進行し
ている場合にも異方性が小さくなる。すなわち、熱間仕
上圧延の終了温度が９４０℃以上であれば｜Δｒ｜が
０．２０以下となり、機械的性質の面内異方性が十分に
小さいものとなる。In step B, rough rolling is performed at a high temperature to make the crystal grains as coarse as possible, from the viewpoint of recrystallization to some extent at the end of hot rolling to reduce the anisotropy of the hot rolled sheet. is necessary. Therefore, the end temperature of hot finish rolling is specified to be 940 ° C or higher. This temperature is 940
If the temperature is lower than ° C, recrystallization does not occur, so that the crystal grains have an expanded grain structure and anisotropy becomes large. On the contrary,
When this temperature exceeds 940 ° C., partially recrystallized crystal grains start to be formed, and when it exceeds 1010 ° C., it is completely recrystallized, and the grain growth structure becomes higher as the temperature becomes higher. Then, as described above, since the anisotropy of the hot-rolled sheet tends to be small when recrystallization is progressed to some extent at the end of hot rolling, so that not only the complete recrystallization of 1010 ° C. but also 940 to 1010 is performed. The anisotropy also becomes small when the recrystallization at ° C partially progresses. That is, when the finish temperature of hot finish rolling is 940 ° C. or higher, | Δr | becomes 0.20 or lower, and the in-plane anisotropy of mechanical properties becomes sufficiently small.
【００１６】なお、この工程には往復圧延やタンデム圧
延などを採用することができるが、生産性を向上させる
観点からはタンデム圧延が好ましい。Ｃ工程の熱延板焼
鈍工程は、９６０〜１２００℃で行う。この温度が９６
０℃未満では機械的性質が十分なものにならず、｜Δｒ
｜がかえって大きくなる傾向にある。また、１２００℃
を超えても機械的性質や｜Δｒ｜に大きな変化がなく、
コスト面を考慮すると１２００℃を超えることは好まし
くない。したがって熱延板焼鈍を９６０〜１２００℃の
範囲に規定する。この工程は連続焼鈍炉で行っても、箱
焼鈍炉で行ってもよいが、生産性の面からは連続焼鈍炉
を用いることが好ましい。Although reciprocal rolling and tandem rolling can be adopted in this step, tandem rolling is preferable from the viewpoint of improving productivity. The hot rolled sheet annealing step of the step C is performed at 960 to 1200 ° C. This temperature is 96
If the temperature is less than 0 ° C, the mechanical properties will not be sufficient, and | Δr
On the contrary, | tends to be large. Also 1200 ° C
Even if it exceeds, there is no significant change in mechanical properties and | Δr |
Considering the cost, it is not preferable to exceed 1200 ° C. Therefore, hot-rolled sheet annealing is specified within the range of 960 to 1200 ° C. This step may be performed in a continuous annealing furnace or a box annealing furnace, but it is preferable to use the continuous annealing furnace from the viewpoint of productivity.
【００１７】Ｄ工程のデスケーリング工程は特に限定さ
れるものではなく、通常用いられる方法が採用され、シ
ョットブラストなどの機械的手段と硝弗酸などの酸洗手
段との組み合わせなどにより行うことができる。The descaling step of the step D is not particularly limited, and a commonly used method is adopted, and it can be performed by a combination of mechanical means such as shot blasting and pickling means such as hydrofluoric acid. it can.
【００１８】なお、本発明はオーステナイト系ステンレ
ス鋼を対象とするものであり、その鋼種は特に限定され
ないが、代表的にはＪＩＳのＳＵＳ３０４が挙げられ、
その他ＳＵＳ３０４Ｌ、ＳＵＳ３０１、ＳＵＳ３１６、
ＳＵＳ３１６Ｌなどに適用することができる。The present invention is intended for austenitic stainless steels, and its steel type is not particularly limited, but typically SUS304 of JIS,
Others SUS304L, SUS301, SUS316,
It can be applied to SUS316L and the like.
【００１９】[0019]
【実施例】以下、本発明の実施例について説明する。オ
ーステナイトステンレス鋼としてＳＵＳ３０４、ＳＵＳ
３０４Ｌ、ＳＵＳ３０１、ＳＵＳ３１６、ＳＵＳ３１６
Ｌを選び、各鋼種のスラブを種々の温度で加熱後、種々
の条件で熱間粗圧延および仕上圧延を行い、板厚１．０
〜８．０ｍｍの熱延板とした。その後種々の温度で熱延
板焼鈍を行い、さらにデスケールを施した。Embodiments of the present invention will be described below. SUS304, SUS as austenitic stainless steel
304L, SUS301, SUS316, SUS316
Select L, heat the slabs of each steel type at various temperatures, and then perform hot rough rolling and finish rolling under various conditions to obtain a plate thickness of 1.0.
It was a hot-rolled sheet of ~ 8.0 mm. Then, hot rolled sheet annealing was performed at various temperatures, and further descaling was performed.
【００２０】その際の鋼種、スラブ加熱温度、熱間仕上
圧延終了温度、焼鈍温度、鋼板の最終板厚を表１に示
す。なお、ＳＵＳ３０４、ＳＵＳ３０４Ｌ、ＳＵＳ３０
１、ＳＵＳ３１６、ＳＵＳ３１６Ｌの化学成分は以下の
とおりである。Table 1 shows the steel types, the slab heating temperature, the hot finish rolling finish temperature, the annealing temperature, and the final thickness of the steel sheet in that case. In addition, SUS304, SUS304L, SUS30
The chemical components of 1, SUS316 and SUS316L are as follows.
【００２１】 ＳＵＳ３０４：０．０５Ｃ−１８．３Ｃｒ−８．２Ｎｉ ＳＵＳ３０４Ｌ：０．０１Ｃ−１８．４Ｃｒ−９．５Ｎ
ｉ ＳＵＳ３０１：０．０６Ｃ−１６．６Ｃｒ−６．３Ｎｉ ＳＵＳ３１６：０．５５Ｃ−１６．６Ｃｒ−１０．８Ｎ
ｉ−２．３Ｍｏ ＳＵＳ３１６Ｌ：０．０１５Ｃ−１６．７Ｃｒ−１２．
９Ｎｉ−２．６Ｍｏ これらの熱延板について、肌荒れの有無、｜Δｒ｜の
値、およびイアリング率を評価した。その結果を表１に
併記する。SUS304: 0.05C-18.3Cr-8.2Ni SUS304L: 0.01C-18.4Cr-9.5N
i SUS301: 0.06C-16.6Cr-6.3Ni SUS316: 0.55C-16.6Cr-10.8N
i-2.3Mo SUS316L: 0.015C-16.7Cr-12.
9Ni-2.6Mo For these hot-rolled sheets, the presence or absence of rough skin, the value of | Δr |, and the earing rate were evaluated. The results are also shown in Table 1.
【００２２】[0022]
【表１】 [Table 1]
【００２３】表１から明らかなように、本発明の範囲を
満足するＮｏ．１〜１０では、｜Δｒ｜が０．２０％以
下と機械的性質の面内異方性が小さく、したがってイア
リング率も５％未満と低い値となることが確認された。
これは、本発明に従って製造された鋼板は、熱間仕上圧
延終了温度が９４０℃以上であるために金属組織が部分
的再結晶あるいは完全再結晶になっいるからである。As is clear from Table 1, No. 1 satisfying the range of the present invention. It was confirmed that in 1 to 10, | Δr | was 0.20% or less, the in-plane anisotropy of mechanical properties was small, and therefore the earing rate was as low as less than 5%.
This is because the steel sheet manufactured according to the present invention has a metal structure that is partially recrystallized or completely recrystallized because the hot finish rolling end temperature is 940 ° C. or higher.
【００２４】これに対し、比較例であるＮｏ．１１，１
２は、スラブ加熱温度、熱間仕上げ圧延終了温度が低い
ために｜Δｒ｜が増大している。また、Ｎｏ．１３は逆
にスラブ加熱温度が１３１０℃と高すぎるため、｜Δｒ
｜は良好な値を示したものの、肌荒れが発生した。Ｎ
ｏ．１４〜１６は、スラブ加熱温度は低くはないが熱間
仕上圧延終了温度が低いためにやはり｜Δｒ｜が大きか
った。Ｎｏ．１７〜１９は、熱間仕上げ圧延後の熱延板
焼鈍温度が低いためにやはり｜Δｒ｜が大きかった。On the other hand, No. 11,1
In No. 2, | Δr | increases because the slab heating temperature and the hot finish rolling end temperature are low. In addition, No. On the other hand, in No. 13, since the slab heating temperature is too high at 1310 ° C,
│ showed a good value, but rough skin occurred. N
o. In Nos. 14 to 16, although the slab heating temperature was not low, | Δr | was still large because the hot finish rolling end temperature was low. No. 17 to 19 also had a large | Δr | because the hot-rolled sheet annealing temperature after hot finish rolling was low.
【００２５】[0025]
【発明の効果】以上説明したように、本発明によれば、
熱延板焼鈍、焼鈍後の冷間圧延および最終焼鈍を省略し
た熱延板状態で、従来と同等以上の加工性を有し、特に
機械的性質の面内異方性の小さいオーステナイト系ステ
ンレス鋼板または鋼帯を製造することができ、幅広い用
途に適用することが可能となる。As described above, according to the present invention,
Austenitic stainless steel sheet with hot workability equal to or better than conventional ones, especially in the in-plane anisotropy of mechanical properties, in a hot-rolled sheet state where hot-rolled sheet annealing, cold rolling after annealing and final annealing are omitted. Alternatively, a steel strip can be manufactured and can be applied to a wide range of applications.
Claims (1)
を１２００℃以上１３００℃以下の温度範囲に加熱し、
熱間粗圧延後、熱間仕上圧延を９４０℃以上で終了し、
９６０〜１２００℃で熱延板焼鈍を行った後、デスケー
リングを施し、以下の式で示されるΔｒの絶対値｜Δｒ
｜が０．２０以下であることを特徴とするする、異方性
の小さいオーステナイト系ステンレス鋼板または鋼帯の
製造方法。 Δｒ＝｛（ｒ0 ＋ｒ90）／２｝−ｒ45 ただし、ｒ0 ，ｒ90，ｒ45は、それぞれ圧延方向に対し
て０°、４５°、９０°の方向のランクフォード値を表
わす。1. A slab of austenitic stainless steel is heated to a temperature range of 1200 ° C. or higher and 1300 ° C. or lower,
After hot rough rolling, finish hot rolling at 940 ° C or higher,
After performing hot-rolled sheet annealing at 960 to 1200 ° C., descaling is performed, and the absolute value of Δr represented by the following formula | Δr
| Is 0.20 or less, a method for producing an austenitic stainless steel sheet or steel strip having a small anisotropy. Δr = {(r 0 + r 90 ) / 2} −r 45 where r 0 , r 90 , and r 45 represent Rankford values in the directions of 0 °, 45 °, and 90 ° with respect to the rolling direction, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17701294A JPH0841550A (en) | 1994-07-28 | 1994-07-28 | Production of austenitic stainless steel sheet or steel strip small in anisotropy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17701294A JPH0841550A (en) | 1994-07-28 | 1994-07-28 | Production of austenitic stainless steel sheet or steel strip small in anisotropy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0841550A true JPH0841550A (en) | 1996-02-13 |
Family
ID=16023626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17701294A Pending JPH0841550A (en) | 1994-07-28 | 1994-07-28 | Production of austenitic stainless steel sheet or steel strip small in anisotropy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0841550A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999058731A1 (en) * | 1998-05-13 | 1999-11-18 | Abb Patent Gmbh | Method and system for producing a hot-rolled strip |
-
1994
- 1994-07-28 JP JP17701294A patent/JPH0841550A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999058731A1 (en) * | 1998-05-13 | 1999-11-18 | Abb Patent Gmbh | Method and system for producing a hot-rolled strip |
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