JPS61266587A - Production of cold rolled austenitic stainless steel strip having less surface defects - Google Patents
Production of cold rolled austenitic stainless steel strip having less surface defectsInfo
- Publication number
- JPS61266587A JPS61266587A JP10967785A JP10967785A JPS61266587A JP S61266587 A JPS61266587 A JP S61266587A JP 10967785 A JP10967785 A JP 10967785A JP 10967785 A JP10967785 A JP 10967785A JP S61266587 A JPS61266587 A JP S61266587A
- Authority
- JP
- Japan
- Prior art keywords
- grinding
- annealing
- steel strip
- pickling
- stainless steel
- 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.)
- Granted
Links
Landscapes
- Metal Rolling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は表面欠陥の少ないオーステナイト系ステンレス
冷延鋼帯の製造方法に係り、特にグラインダー研削によ
り発生する微小欠陥を防止できる製造方法に関し、オー
ステナイト系ステンレス冷延鋼帯の製造分野で利用され
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing an austenitic cold-rolled stainless steel strip with few surface defects, and particularly relates to a manufacturing method that can prevent micro defects caused by grinding with a grinder. Used in the production of stainless steel cold-rolled steel strips.
オーステナイト系ステンレス冷延鋼帯は一般ζζ熱間圧
延鋼帯を焼鈍、酸洗−グラインダー研削−冷間圧延−焼
鈍、酸洗−調質圧延等の工程で処理して製造される。こ
のグラインダー研削工程は熱延鋼帯の焼鈍、酸洗までに
発生した表面疵を除去する目的で行われ、乙の工程を省
略すると冷間圧延後も熱延鋼帯の目立つ表面欠陥が残留
し著しく商品価値を低下させることが多い。Austenitic stainless steel cold-rolled steel strips are produced by processing general ζζ hot-rolled steel strips through processes such as annealing, pickling-grinder grinding-cold rolling-annealing, pickling-temper rolling, and the like. This grinder grinding process is carried out for the purpose of removing surface flaws that have occurred during annealing and pickling of the hot rolled steel strip. If step B is omitted, noticeable surface defects will remain on the hot rolled steel strip even after cold rolling. It often significantly reduces product value.
ここで問題となるのは、グラインダー研削で熱延鋼帯の
目立つ表面欠陥は除去できるが、微小欠陥は相変わらず
存在していることである。この対策として特開昭５２−
３６３９７が開示されている。これは第３図に示す如き
、ブレーカ−ロール２間を通板する鋼帯４にエンドレス
研削ベルト６をコンタクトロール８、ビリロール１０で
押圧し研削部にスプレーノズル１２で研削油をスプレー
して研削する装置において、エンドレス研削ベルト６の
研削位置退出部分に新たにスプレーノズル１４を設けて
研削油をスプレーして研削かすを流出し、従来研削ベル
ト６に付着して目詰りをおこしていた研削かすを除去し
、研削効率をあげ研削かすによるすり疵を防止するもの
である。しかしながら、この方法においても、表面の微
小欠陥は防止できないという問題点がある。The problem here is that although conspicuous surface defects in hot-rolled steel strips can be removed by grinding, minute defects still remain. As a countermeasure to this problem,
No. 36397 is disclosed. As shown in Fig. 3, an endless grinding belt 6 is pressed against a steel strip 4 passing between a breaker and a roll 2 with a contact roll 8 and a biri roll 10, and grinding oil is sprayed onto the grinding part using a spray nozzle 12 to perform grinding. In this device, a new spray nozzle 14 is installed at the exit part of the grinding position of the endless grinding belt 6 to spray grinding oil and drain the grinding swarf, removing the grinding swarf that conventionally adhered to the grinding belt 6 and caused clogging. This improves grinding efficiency and prevents scratches caused by grinding debris. However, even with this method, there is a problem that micro defects on the surface cannot be prevented.
本発明の目的は、上記従来技術の問題点を解決し微小な
表面欠陥の少ないオーステナイト系ステンレス冷延鋼帯
の製造方法を提供するにある。An object of the present invention is to provide a method for manufacturing an austenitic stainless steel cold rolled steel strip that solves the above-mentioned problems of the prior art and has fewer microscopic surface defects.
〔問題点を解決するための手段および作用〕本発明の要
旨とするところは次の如くである。[Means and operations for solving the problems] The gist of the present invention is as follows.
すなわち、熱間圧延鋼帯を焼鈍、酸洗−グラインダー研
削−冷間圧延−焼鈍、酸洗−調質圧延等の工程で処理す
るオーステナイト系ステンレス冷延鋼帯の製造方法にお
いて、前記グラインダー研削工程と冷間圧延工程の間に
表面硬度をビッカースで２００以下とする大気焼鈍工程
と、前記大気焼鈍工程に引続く酸洗工程と、を有するこ
とを特徴とする表面欠陥の少ないオーステナイト系ステ
ンレス冷延鋼帯の製造方法である。That is, in a method for producing an austenitic stainless cold rolled steel strip in which a hot rolled steel strip is subjected to processes such as annealing, pickling-grinder grinding-cold rolling-annealing, pickling-temper rolling, etc., the grinder grinding step A cold-rolled austenitic stainless steel with few surface defects, characterized by comprising: an air annealing step to reduce the surface hardness to 200 or less on Vickers scale between the cold rolling steps, and a pickling step following the air annealing step. This is a method of manufacturing steel strip.
本発明者らは、熱延鋼帯にグラインダー研削を行った場
合の微小な表面欠陥について種々検討した結果、次の事
実が判明した。The present inventors conducted various studies regarding minute surface defects when grinding a hot rolled steel strip with a grinder, and as a result, the following facts were found.
（＾）グラインダー研削を行うと、被研削部が加工硬化
し、研削目の硬度があがセ、この研削目は冷間圧延によ
っても消滅せず残留して微小欠陥となる。(^) When grinding is performed, the part to be ground is work-hardened and the hardness of the grinding marks deteriorates, and even after cold rolling, these grinding marks do not disappear but remain and become micro defects.
（Ｂ）グラインダー研削時に発生する研削かすは、従来
の通常の研削機において研削部へ噴射する研削油の圧力
を上昇することにより、研削ベルトに付着して目詰りを
起す現象はほぼ解消する。(B) By increasing the pressure of the grinding oil that is injected into the grinding part in a conventional normal grinder, the phenomenon that the grinding swarf generated during grinding adheres to the grinding belt and causes clogging can be almost eliminated.
（Ｃ）上記の研削油の圧力上昇により研削かすか銅帯表
面に付着する量も減少するが、皆無にはならず、わずか
に付着した研削かすが後工程の冷間圧延においてワーク
ロールにより銅帯表面に押込まれ微小欠陥の原因となっ
ている。(C) Due to the pressure increase of the grinding oil mentioned above, the amount of grinding swarf adhering to the surface of the copper strip decreases, but it does not disappear completely, and a small amount of the adhering grinding swarf is removed from the surface of the copper strip by work rolls during cold rolling in the subsequent process. This causes micro defects.
（Ｄ）製錬時に巻込れたスラグ等の非金属介在物が鋼帯
のグラインダー研削により表面に露出し、これが冷間圧
延時にワークロールで表面に押込まれ微小欠陥の原因と
なる。(D) Non-metallic inclusions such as slag that are rolled up during smelting are exposed on the surface by grinding the steel strip with a grinder, and are pushed into the surface by work rolls during cold rolling, causing micro defects.
上記の如くグラインダー研削を行ったコイルに発生する
問題点は上記の如（４つに大別できるが、このうち２番
目の（Ｂ）項は、特開昭５２−３６３９７によらずとも
従来のスプレー法において研削油のスプレー圧力を上昇
することによって・解消できる。The problems that occur in coils that have been ground using a grinder as described above can be roughly divided into four types, but the second item (B) is not based on Japanese Patent Application Laid-Open No. 52-36397. This can be resolved by increasing the spray pressure of grinding oil in the spray method.
残りの（Ａ）、（す、（Ｄ）項については次の如き対策
を見い出した。Regarding the remaining items (A), (S), and (D), we found the following countermeasures.
（Ａ）グラインダー研削時の被研削部の加工硬化により
研削目が冷間圧延により解消せず残留する点は、軟化の
ための焼鈍を実施すれば解決する。(A) The problem that the grinding marks remain due to work hardening of the part to be ground during grinding without being eliminated by cold rolling can be solved by performing annealing for softening.
（Ｃ）鋼帯表面に付着している研削かすのうち水洗のブ
ラッシングで除去不能の強固にかみこんでいるものは、
酸洗で除去する。(C) Of the grinding swarf adhering to the surface of the steel strip, those that are firmly embedded and cannot be removed by brushing with water are
Remove by pickling.
（Ｄ）製錬時に巻込まれたスラグ等の非金属介在物が鋼
帯のグラインダー研削によって表層に露出し、冷間圧延
時のワークロールで押込まれる微小欠陥については、大
気中で焼鈍を行い表層部をスケール化し続いて酸洗を行
うことで、スケール部と共に表層に露出している介在物
を除去することで防止できる。(D) Non-metallic inclusions such as slag that were rolled in during smelting are exposed to the surface layer by grinder grinding of the steel strip, and micro defects that are pushed in by work rolls during cold rolling are annealed in the atmosphere. This can be prevented by scaling the surface layer and then performing pickling to remove inclusions exposed on the surface along with the scale.
本発明は、これらの対策を新たに工程に組込んだもので
あり、大気焼鈍工程と酸洗工程から構成されている。The present invention newly incorporates these measures into the process, and consists of an air annealing process and a pickling process.
まず、本発明の大気焼鈍工程について説明する。First, the atmospheric annealing process of the present invention will be explained.
オーステナイト系ステンレス鋼の加工硬化については周
知の現象であるが、その代表＃Ｉ種である５ＵＳ３０４
鋼の母材がビッカース硬度で１７０の場合のグラインダ
ー研削による表層部の加工硬化を第２図に示したが、最
外層はＨｖで２５０程度まで上昇している。Work hardening of austenitic stainless steel is a well-known phenomenon, and 5US304, the representative #I type,
Figure 2 shows the work hardening of the surface layer by grinder grinding when the steel base material has a Vickers hardness of 170, and the Hv of the outermost layer has increased to about 250.
次に、グラインダー研削により表面硬度がビッカース硬
度で２４５に硬化したステンレス鋼を各種の温度で大気
焼鈍を行い、次に酸洗−冷間圧延−焼鈍酸洗−調質圧延
を行って表面の状況を調査し、その結果を第１表に示し
た。Next, stainless steel whose surface hardness has been hardened to 245 Vickers hardness by grinding is annealed in the air at various temperatures, and then pickled, cold rolled, annealed, pickled, and temper rolled to improve the surface condition. The results are shown in Table 1.
第１表の結果から、微小欠陥を防止するためには表面硬
度をＨｖで２００以下とする必要がある。From the results in Table 1, the surface hardness needs to be 200 or less in Hv in order to prevent micro defects.
従って本発明においては、大気焼鈍でＨｖを２００以下
とする如く限定した。Therefore, in the present invention, the Hv was limited to 200 or less by atmospheric annealing.
第１表
また、第１図に５ＵＳ３０４ステンレス鋼の焼鈍におけ
る温度、時間と軟化の関係を示した。Ｈｖで２００以下
に軟化するためには、１１００℃ＸＯ，Ｓ分と１０００
℃×０．８分とを結ぶ線以上の焼鈍を必要とすることが
わかる。Table 1 and Figure 1 show the relationship between temperature, time, and softening during annealing of 5US304 stainless steel. In order to soften Hv to 200 or less, 1100℃XO,S minute and 1000℃
It can be seen that annealing beyond the line connecting ℃ x 0.8 minutes is required.
次に、上記の焼鈍で発生したスケールを除去して表層に
露出している介在物を取り除く酸洗については、下記第
２表で示す条件で行うのが望ましい。これらは単独でも
よいが、複数を組合せれば更に効果的である。Next, pickling to remove scale generated during the annealing and inclusions exposed on the surface layer is preferably carried out under the conditions shown in Table 2 below. These may be used alone, but it is more effective if a plurality of them are combined.
第２表
本発明は上記の如き、大気焼鈍および酸洗を冷間圧延前
に実施することで表面の微小欠陥の少ないオーステナイ
ト系ステンレス冷延鋼帯を製造することができた。Table 2 The present invention was able to produce an austenitic stainless steel cold-rolled steel strip with few surface micro-defects by performing atmospheric annealing and pickling before cold rolling as described above.
Ｓ Ｕ Ｓ ３０４ステンレス熱延鋼帯をグラインダー
研削によって熱延の疵を除去し、その時の表面の硬度は
Ｈｖ＝２４１であった。この鋼帯を１０５０℃で１分間
の大気焼鈍を行い、引続いて下記第３表に示す条件で次
々と浸漬して完全に脱スケールをした。A SUS 304 stainless steel hot rolled steel strip was subjected to grinding to remove hot rolling flaws, and the surface hardness at that time was Hv=241. This steel strip was annealed in the air at 1050° C. for 1 minute, and then immersed one after another under the conditions shown in Table 3 below to completely descale.
第３表
酸洗した鋼帯を冷間圧延し、引続いて焼鈍、酸洗および
調質圧延を行い、製造された冷延板を詳細に観察したが
微小欠陥は認められなかった。Table 3 A pickled steel strip was cold rolled, followed by annealing, pickling and temper rolling, and the produced cold rolled sheet was observed in detail, but no micro defects were observed.
本発明は上記実施例からも明らかな如く、熱延鋼帯をグ
ラインダー研削後、表面硬度をビッカースで２００以下
とする大気焼鈍および酸洗を実施し、続いて冷間圧延を
行うことにより、オーステナイト系ステンレス冷延鋼帯
の微小欠陥の発生率を従来の４０％から２％に著減させ
、表面品質を著しく向上する効果をあげることができた
。As is clear from the above examples, the present invention is capable of producing austenite by grinding a hot-rolled steel strip, performing atmospheric annealing and pickling to reduce the surface hardness to 200 or less on Vickers scale, and then cold rolling. The occurrence rate of micro defects in cold-rolled stainless steel strips was significantly reduced from 40% to 2%, and the surface quality was significantly improved.
第１図は５ＵＳ３０４ステンレス鋼の焼鈍における時間
、温度と軟化の関係を示す線図、第２図は５ＵＳ３０４
ステンレス鋼のグラインダー研削による表層部の加工硬
化を示す線図、第３図は従来のステンレス鋼研削方法を
示す研削装置の模式正面図である。Figure 1 is a diagram showing the relationship between time, temperature and softening during annealing of 5US304 stainless steel, Figure 2 is a diagram showing the relationship between softening of 5US304 stainless steel.
A diagram showing work hardening of the surface layer of stainless steel by grinding with a grinder, and FIG. 3 is a schematic front view of a grinding device showing a conventional stainless steel grinding method.
Claims (1)
冷間圧延−焼鈍、酸洗−調質圧延等の工程で処理するオ
ーステナイト系ステンレス冷延鋼帯の製造方法において
、前記グラインダー研削工程と冷間圧延工程の間に表面
硬度をビッカースで２００以下とする大気焼鈍工程と、
前記大気焼鈍工程に引続く酸洗工程と、を有することを
特徴とする表面欠陥の少ないオーステナイト系ステンレ
ス冷延鋼帯の製造方法。(1) Annealing and pickling of hot rolled steel strip - grinding with a grinder -
In a method for manufacturing an austenitic stainless steel cold rolled steel strip which is treated through a process such as cold rolling-annealing or pickling-temper rolling, the surface hardness is set to 200 or less in Vickers between the grinder grinding process and the cold rolling process. an atmospheric annealing process,
A method for producing an austenitic stainless cold rolled steel strip with few surface defects, the method comprising the step of pickling subsequent to the atmospheric annealing step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10967785A JPS61266587A (en) | 1985-05-22 | 1985-05-22 | Production of cold rolled austenitic stainless steel strip having less surface defects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10967785A JPS61266587A (en) | 1985-05-22 | 1985-05-22 | Production of cold rolled austenitic stainless steel strip having less surface defects |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61266587A true JPS61266587A (en) | 1986-11-26 |
| JPH0447012B2 JPH0447012B2 (en) | 1992-07-31 |
Family
ID=14516377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10967785A Granted JPS61266587A (en) | 1985-05-22 | 1985-05-22 | Production of cold rolled austenitic stainless steel strip having less surface defects |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61266587A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63123442A (en) * | 1986-11-11 | 1988-05-27 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for gaseous phase intramolecular dehydration reaction of alkanolamines |
| JPS63123441A (en) * | 1986-11-11 | 1988-05-27 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for gaseous phase intramolecular dehydration reaction of alkanolamines |
| JPS63126556A (en) * | 1986-11-17 | 1988-05-30 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for vapor phase intramolecular dehydration reaction of alkanol amines |
| JPS63126558A (en) * | 1986-11-17 | 1988-05-30 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for vapor phase intramolecular dehydration reaction of alkanol amines |
| JPS63126557A (en) * | 1986-11-17 | 1988-05-30 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for vapor phase intramolecular dehydration reaction of alkanol amines |
| JP2018149587A (en) * | 2017-03-15 | 2018-09-27 | 日立金属株式会社 | Manufacturing method of steel strip |
-
1985
- 1985-05-22 JP JP10967785A patent/JPS61266587A/en active Granted
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63123442A (en) * | 1986-11-11 | 1988-05-27 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for gaseous phase intramolecular dehydration reaction of alkanolamines |
| JPS63123441A (en) * | 1986-11-11 | 1988-05-27 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for gaseous phase intramolecular dehydration reaction of alkanolamines |
| JPH0576343B2 (en) * | 1986-11-11 | 1993-10-22 | Nippon Catalytic Chem Ind | |
| JPH0587301B2 (en) * | 1986-11-11 | 1993-12-16 | Nippon Catalytic Chem Ind | |
| JPS63126556A (en) * | 1986-11-17 | 1988-05-30 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for vapor phase intramolecular dehydration reaction of alkanol amines |
| JPS63126558A (en) * | 1986-11-17 | 1988-05-30 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for vapor phase intramolecular dehydration reaction of alkanol amines |
| JPS63126557A (en) * | 1986-11-17 | 1988-05-30 | Nippon Shokubai Kagaku Kogyo Co Ltd | Catalyst for vapor phase intramolecular dehydration reaction of alkanol amines |
| JP2018149587A (en) * | 2017-03-15 | 2018-09-27 | 日立金属株式会社 | Manufacturing method of steel strip |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0447012B2 (en) | 1992-07-31 |
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