JP3633126B2 - High-efficiency manufacturing method of stainless steel cold-rolled steel strip having high glossiness of glossiness (Gs (20 °); L direction) 900 or more - Google Patents
High-efficiency manufacturing method of stainless steel cold-rolled steel strip having high glossiness of glossiness (Gs (20 °); L direction) 900 or more Download PDFInfo
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- JP3633126B2 JP3633126B2 JP21986696A JP21986696A JP3633126B2 JP 3633126 B2 JP3633126 B2 JP 3633126B2 JP 21986696 A JP21986696 A JP 21986696A JP 21986696 A JP21986696 A JP 21986696A JP 3633126 B2 JP3633126 B2 JP 3633126B2
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- glossiness
- steel strip
- cold
- rolling
- stainless steel
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Description
【0001】
【発明の属する技術分野】
本発明は、高光沢を有するステンレス冷延鋼帯の製造方法に関する。
【0002】
【従来の技術】
従来、ステンレス冷延鋼帯の光沢を向上させる方法としては、冷間圧延の際に、低粘度の圧延用潤滑油を用いる、あるいは小径のワークロールを用いる等して、ロールバイト内の油量の減少を図り、調整されたロール表面粗さの鋼帯表面への転写率を高める方法が広く採用されている。
【0003】
また、特に高光沢を要求されるステンレス冷延鋼帯を得る方法としては、中間焼鈍酸洗後の冷間圧延の特定パスにおけるワークロールの表面粗さを規制する(特開平2−59101 号公報参照)方法や、また、ステンレス鋼に限られないが厚み5〜150 μm の金属箔の製造に関し、表面光沢と形状を良くするために鏡面仕上したヤング率31000 〜54000 kgf/mm2 のワークロールを用いて最終パスの圧延を行う(特開平1−197004号公報参照)方法等が知られている。
【0004】
【発明が解決しようとする課題】
しかし、上記従来の方法によるのでは、圧延速度を下げて操業しなければ所望の光沢度が得られず、そのためにステンレス鋼帯の生産能率が低いという難点があった。
そこで本発明は、この難点を克服し、高光沢を有するステンレス鋼帯を従来に比し高い生産能率で製造できる方法を提供することを目的とする。
【0005】
【課題を解決するための手段】
本発明は、高光沢を有するステンレス冷延鋼帯の製造方法において、複数パス連続させて行う冷間圧延の最終パスの圧延を、ヤング率が54000kgf/mm2超えで中心線平均粗さRa が0.02μm 以上0.10μm 以下のワークロールを用いて圧延速度 200mpm 以上で行うことを特徴とする光沢度 (Gs(20 ° ); L方向 ) 900 以上の高光沢を有するステンレス冷延鋼帯の高能率製造方法である。
【0006】
【発明の実施の形態】
本発明によれば、ヤング率が54000kgf/mm2超え、中心線平均粗さRa が0.02μm 以上0.10μm 以下のワークロールを用いて最終パスの圧延を行うことにより、従来方法では光沢度が低下してしまう範囲にまで圧延速度を大きくしても光沢度が低下しない。よって、高光沢のステンレス冷延鋼帯を圧延速度を上げて製造できる。
【0007】
最終パス圧延に使用するワークロールのヤング率を54000kgf/mm2超えとしたのは、ヤング率がこれ以下のワークロールを使用した場合、最終圧延時の圧下量によっては圧延荷重が増大してロール偏平量が過大となり、その結果、ロールバイト内の油量が増え、オイルピットと呼ばれる幅方向のシワ状欠陥が発生しやすくなることから、高光沢が得られる圧下量の範囲が狭すぎパス回数が増えて生産能率の向上効果が得られないためである。
【0008】
そして、前記ワークロールの中心線平均粗さRa が0.02μm 未満では、圧延速度の増大につれてロールバイト内へ引き込まれる油量が増えて、オイルピットが発生しやすくなるため、また、Ra が0.10μm を超えると、ロール表面の凹部から円周方向に油が流出するためロールバイト内の油量は減少するが、反面、Raの大きいロール表面粗さが直に鋼帯表面に転写されるため、いずれにおいても高光沢を得るのが困難となる。
【0009】
【実施例】
SUS304ステンレス鋼帯を連続冷間圧延で製造するに際し、実施例として、最終圧延パスのワークロールにヤング率が57000kgf/mm2、中心線平均粗さRa が0.04μm のWC(タングステンカーバイド)ロールを使用し、最終パス圧延速度を種々変化させて板厚0.30mmに圧延して、圧延後のステンレス鋼についてJIS Z 8741に基づいて光沢度(Gs(20 °) ;L方向)を調査した。また、従来例として、前記WCロールに代えてヤング率が21000 gf/mm2で中心線平均粗さRa が0.05μm のハイスロールを使用して上記と同様の調査を行った。
【0010】
図1は、実施例および従来例の光沢度と最終パス圧延速度との関係を示すグラフである。図1に示すように、従来例では、最終パス圧延速度が200mpm以上で光沢度が下限レベルを下回るため、これより低い速度での圧延を余儀なくされ、圧延に多大の時間を要していた。これに対し、実施例では、最終パス圧延速度を350mpmに増速しても、下限レベルを超える光沢度が維持できており、生産効率が格段に向上することが明らかである。
【0011】
なお、本実施例では最終パス圧延のワークロールとして、1水準のヤング率と中心線平均粗さRa の組合せを備えたロールを用いた例を示したが、本発明はこれに限定されるものではなく、本発明範囲を満たすロールであれば、必要に応じて他の水準のヤング率および中心線平均粗さRa の組合せを備えたロールを使用して本発明の効果を得ることが可能である。
【0012】
【発明の効果】
本発明によれば、高光沢を有するステンレス鋼帯を従来に比し格段に高い生産能率で製造できるという優れた効果を奏する。
【図面の簡単な説明】
【図1】実施例および従来例の光沢度と最終パス圧延速度との関係を示すグラフである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a stainless cold-rolled steel strip having high gloss.
[0002]
[Prior art]
Conventionally, as a method for improving the glossiness of a stainless cold-rolled steel strip, the amount of oil in a roll bite can be reduced by using a low-viscosity rolling lubricant or a small-diameter work roll during cold rolling. A method is widely adopted in which the transfer rate of the adjusted roll surface roughness to the steel strip surface is increased.
[0003]
Further, as a method for obtaining a stainless cold-rolled steel strip that requires particularly high gloss, the surface roughness of the work roll in a specific pass of cold rolling after intermediate annealing pickling is regulated (Japanese Patent Laid-Open No. 2-59101). Reference) and a work roll having a Young's modulus of 31000 to 54000 kgf / mm 2 that is mirror-finished to improve the surface gloss and shape of a metal foil having a thickness of 5 to 150 μm, but not limited to stainless steel. There is known a method of rolling the final pass by using (see JP-A-1-197004).
[0004]
[Problems to be solved by the invention]
However, according to the above-described conventional method, a desired glossiness cannot be obtained unless the rolling speed is reduced, and there is a problem that the production efficiency of the stainless steel strip is low.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for overcoming this difficulty and capable of producing a stainless steel strip having high gloss with a higher production efficiency than in the past.
[0005]
[Means for Solving the Problems]
The present invention relates to a method of manufacturing a stainless steel cold-rolled steel strip having high gloss, and rolling in the final pass of cold rolling performed by continuously performing a plurality of passes, the Young's modulus exceeds 54000 kgf / mm 2 and the centerline average roughness Ra is Glossiness (Gs (20 ° ); L direction ) , characterized by being performed at a rolling speed of 200mpm or more using a work roll of 0.02μm or more and 0.10μm or less. High efficiency of stainless cold rolled steel strip with high gloss of 900 or more It is a manufacturing method.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, the conventional method rolls the final pass using a work roll having a Young's modulus exceeding 54000 kgf / mm 2 and a centerline average roughness Ra of 0.02 μm or more and 0.10 μm or less. The glossiness does not decrease even if the rolling speed is increased to such a range that decreases. Therefore, a high-gloss stainless steel cold-rolled steel strip can be produced at an increased rolling speed.
[0007]
The reason why the Young's modulus of the work roll used for the final pass rolling is set to exceed 54000 kgf / mm 2 is that when a work roll having a Young's modulus lower than this is used, the rolling load increases depending on the amount of rolling during the final rolling. The amount of oil in the roll bite increases, and as a result, wrinkle-like defects in the width direction called oil pits are likely to occur, so the range of reduction to obtain high gloss is too narrow. This is because an increase in production efficiency cannot be obtained.
[0008]
If the center roll average roughness Ra of the work roll is less than 0.02 μm, the amount of oil drawn into the roll bite increases as the rolling speed increases, and oil pits are likely to occur. When the thickness exceeds .10 μm, oil flows out from the recesses on the roll surface in the circumferential direction, so the amount of oil in the roll bite decreases, but on the other hand, the roll surface roughness with large Ra is directly transferred to the steel strip surface. Therefore, it is difficult to obtain high gloss in any case.
[0009]
【Example】
When producing a SUS304 stainless steel strip by continuous cold rolling, a WC (tungsten carbide) roll having a Young's modulus of 57000 kgf / mm 2 and a center line average roughness Ra of 0.04 μm is used as a work roll in the final rolling pass as an example. Was used, and the final pass rolling speed was variously changed and rolled to a plate thickness of 0.30 mm. The rolled stainless steel was examined for glossiness (Gs (20 °); L direction) based on JIS Z 8741. . As a conventional example, the same investigation as described above was performed using a high-speed roll having a Young's modulus of 21000 gf / mm 2 and a centerline average roughness Ra of 0.05 μm instead of the WC roll.
[0010]
FIG. 1 is a graph showing the relationship between the glossiness and the final pass rolling speed in Examples and Conventional Examples. As shown in FIG. 1, in the conventional example, since the final pass rolling speed is 200 mpm or more and the glossiness is lower than the lower limit level, rolling at a lower speed is unavoidable and much time is required for rolling. On the other hand, in the examples, even when the final pass rolling speed is increased to 350 mpm, the glossiness exceeding the lower limit level can be maintained, and it is clear that the production efficiency is remarkably improved.
[0011]
In addition, although the present Example showed the example using the roll provided with the combination of 1 level Young's modulus and centerline average roughness Ra as a work roll of the last pass rolling, this invention is limited to this. However, if the roll satisfies the scope of the present invention, it is possible to obtain the effects of the present invention using a roll having a combination of other levels of Young's modulus and centerline average roughness Ra as necessary. is there.
[0012]
【The invention's effect】
According to the present invention, there is an excellent effect that a stainless steel strip having high gloss can be manufactured with a significantly higher production efficiency than conventional ones.
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between glossiness and final pass rolling speed in Examples and Conventional Examples.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21986696A JP3633126B2 (en) | 1996-08-21 | 1996-08-21 | High-efficiency manufacturing method of stainless steel cold-rolled steel strip having high glossiness of glossiness (Gs (20 °); L direction) 900 or more |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21986696A JP3633126B2 (en) | 1996-08-21 | 1996-08-21 | High-efficiency manufacturing method of stainless steel cold-rolled steel strip having high glossiness of glossiness (Gs (20 °); L direction) 900 or more |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1058009A JPH1058009A (en) | 1998-03-03 |
JP3633126B2 true JP3633126B2 (en) | 2005-03-30 |
Family
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Application Number | Title | Priority Date | Filing Date |
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JP21986696A Expired - Fee Related JP3633126B2 (en) | 1996-08-21 | 1996-08-21 | High-efficiency manufacturing method of stainless steel cold-rolled steel strip having high glossiness of glossiness (Gs (20 °); L direction) 900 or more |
Country Status (1)
Country | Link |
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JP (1) | JP3633126B2 (en) |
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1996
- 1996-08-21 JP JP21986696A patent/JP3633126B2/en not_active Expired - Fee Related
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JPH1058009A (en) | 1998-03-03 |
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