JPH0770799A - Cold rolled steel sheet for tin plate or tin free steel - Google Patents

Abstract

PURPOSE:To provide the cold rolled steel plate which is specified in the thickness of oxidized films after annealing, has excellent surface color tones and is free from unequal brightness by subjecting the steel plate to alkaline electrolytic washing and limiting the amt. of the water remaining and sticking on the steel plate in a drying stage after washing with water. CONSTITUTION:The steel plate 1 subjected to the alkaline electrolytic washing in a pretreating stage of an annealing furnace is washed in a water washing tank 3 and is drained by wringer rolls 4. Water absorbent paper layer members 6 are pressed to the front and rear surfaces of the steel plate 1 by pressing devices 8 to absorb the water. After the steel plate is passed between the next water absorbent wringer rolls 5, the steel plate is dried by a high-temp. drying machine 7, by which the amt. of the water remaining and sticking on the cold rolled steel plate before annealing is decreased to about <=10mg/m<2>. The amt. of the water remaining and sticking on the steel plate is measured by an IR moisture measuring instrument 10 and the results thereof are fed back to the high-temp. drying machine 7. The steel plate subjected to the pretreatment is subjected to continuous annealing, by which the cold rolled steel plate for tin plates or tin free steel having <=30Angstrom thickness of the oxide films on the blank plate surfaces is obtd.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は表面の清浄なぶりき又は
ティンフリースチール（以下ＴＦＳと云う）用冷延鋼板
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold rolled steel sheet for clean tin or tin-free steel (hereinafter referred to as TFS) having a clean surface.

【０００２】[0002]

【従来の技術】ぶりき又はティンフリースチールは缶用
表面処理鋼板として、古くから知られている。当初はそ
の表面処理鋼板自体の性能、特に、耐食性が要求されて
いたが、近年、薄メッキ化とともに、缶外面の装飾印刷
技術の進歩が目ざましく、外観のデザインで購買意欲を
そそるような美麗な塗装が要求されている。そのため、
ぶりき又はＴＦＳ用冷延鋼板自体の表面の汚れ、色調、
薄い光沢のむら（表面ムラ）も問題視されるようになっ
ている。2. Description of the Related Art Tinplate or tin-free steel has long been known as a surface-treated steel sheet for cans. Initially, the performance of the surface-treated steel sheet itself, especially the corrosion resistance, was required, but in recent years, with the thinning of plating, the progress of decorative printing technology on the outer surface of the can has been remarkable, and the appearance design is a beautiful and inviting purchase. Painting is required. for that reason,
Tinplate or stain on the surface of the cold rolled steel sheet for TFS, color tone,
Even uneven gloss (surface unevenness) is becoming a problem.

【０００３】上記ぶりき又はＴＦＳ用冷延鋼板は熱延鋼
板を酸洗してスケールを除去後、冷間圧延して所定の板
厚にし、電解洗浄をした後、水洗し、複数のゴム製リン
ガーロール（ゴムライニング鋼製ロール）で水切りを行
い、連続焼鈍又はバッチ焼鈍し、調質圧延をして冷延鋼
板として製造される。そして、めっきラインの前処理工
程で、アルカリ洗浄、酸洗、水洗等を行ない、鋼板表面
の清浄化を行っている。The above-mentioned cold-rolled steel sheet for tin or TFS is made of a plurality of rubbers by pickling the hot-rolled steel sheet to remove the scale, cold-rolling it to a predetermined thickness, electrolytically washing it, and washing it with water. Drained with a Ringer roll (rubber lining steel roll), continuously annealed or batch annealed, and temper-rolled to produce a cold rolled steel sheet. Then, in the pretreatment process of the plating line, the surface of the steel sheet is cleaned by performing alkali cleaning, acid cleaning, water cleaning and the like.

【０００４】しかし、上記のような鋼板表面の清浄化処
理はぶりき又はＴＦＳの表面に色調、薄い光沢むらを発
生する場合がある。鋼板表面の清浄化については、特開
昭５７−１０８３００号公報に電解洗浄ラインで温水槽
の浸漬ロールを昇降させ、鋼板を液面より引上げるとと
もに、排気ブロアーにより、温水槽内の水蒸気を吸引す
る手段によって、変色を防止した鋼板を得ることが出来
ることが記載されている。However, the cleaning treatment of the steel sheet surface as described above may cause tint or uneven tone on the surface of the TFS. Regarding the cleaning of the surface of the steel sheet, Japanese Patent Laid-Open No. 57-108300 discloses an electrolytic cleaning line in which a dipping roll of a hot water tank is moved up and down to lift the steel sheet from the liquid level, and an exhaust blower sucks water vapor in the hot water tank. It is described that a steel sheet which prevents discoloration can be obtained by the means.

【０００５】[0005]

【発明が解決しようとする課題】しかしながら、上述し
た特開昭５７−１０８３００号公報に記載されている鋼
板は、冷延鋼板の電解洗浄ラインの温水槽での変色を防
止して得られたものであり、その後に焼鈍処理等を行な
い、ぶりき又はＴＦＳの原板として用いた場合、それら
の表面に色調、薄い光沢むらが発生する場合がある。However, the steel sheet described in JP-A-57-108300 described above is obtained by preventing discoloration in the hot water tank of the electrolytic cleaning line for cold rolled steel sheet. When an annealing treatment or the like is performed thereafter and used as a tin plate or an original plate of TFS, a color tone and thin gloss unevenness may occur on the surface thereof.

【０００６】本発明は、上記のような問題点の解決を図
るべく、めっきした後の表面処理鋼板の表面色調、光沢
ムラ（表面ムラ）とその原板性状との関係を検討し、そ
の結果に基づいたものであり、ぶりき又はＴＦＳを製造
し缶材として使用した場合に、外観が十分に満足出来る
ぶりき又はＴＦＳ用冷延鋼板を提供することを目的とす
る。In order to solve the above-mentioned problems, the present invention investigates the relationship between the surface color tone and uneven gloss (surface unevenness) of the surface-treated steel sheet after plating and the properties of the original plate. An object of the present invention is to provide a cold-rolled steel sheet for tinplate or TFS whose appearance is sufficiently satisfactory when tinplate or TFS is manufactured and used as a can material.

【０００７】[0007]

【課題を解決するための手段及び作用】上記目的を達成
するために、本発明は焼鈍した原板であって、前記原板
表面の酸化膜の厚さが３０Å以下であるぶりき又はティ
ンフリースチール用冷延鋼板とするものである。In order to achieve the above object, the present invention is an annealed original plate for tinplate or tin-free steel in which the thickness of the oxide film on the original plate surface is 30 Å or less. It is a cold rolled steel sheet.

【０００８】１）発明までの経緯：本発明者等は原板製
造時の焼鈍後の原板表面の酸化膜が強固で、めっきライ
ンの前処理等では充分に除去することが出来ず、その酸
化膜の厚さが不均一、且つ膜厚が厚い場合、めっき電解
処理中の酸化膜の還元反応及び金属元素の電析反応に微
妙な差を生じて、ステインと云われる鋼板表面の汚れ等
を生じ、それらがぶりき又はＴＦＳの表面色調、光沢ム
ラの発生の原因であることの知見を得て、本発明に到達
したものである。1) History up to the invention: The present inventors found that the oxide film on the surface of the original plate after annealing during the production of the original plate was strong and could not be sufficiently removed by pretreatment of the plating line. If the thickness is uneven and the thickness is thick, a slight difference occurs in the reduction reaction of the oxide film and the electrodeposition reaction of metal elements during plating electrolytic treatment, and stains such as stains on the steel plate surface occur. The present invention has been accomplished by finding that they are the cause of tint or surface color tone of TFS and uneven gloss.

【０００９】２）ぶりき又はＴＦＳの表面色調と酸化膜
厚の関係（連続焼鈍）： （１）図１は薄めっきしたぶりきの表面色調とぶりき用
冷延鋼板の焼鈍後の酸化膜厚との関係を示す図である。
ここでは薄めっきとして、片面当たり、：２．５ｇｒ
／ｍ² 、：２．0 ｇｒ／ｍ² 、：1 ．５ｇｒ／
ｍ² 、 ：1 ．0 ｇｒ／ｍ² 、：0 ．５ｇｒ／ｍ²
の場合について実験したものである。2) Relationship between surface color tone of tinplate or TFS and oxide film thickness (continuous annealing): (1) FIG. 1 shows surface tone of tin plated tinplate and oxide film after annealing of cold rolled steel sheet for tinplate. It is a figure which shows the relationship with thickness.
Here, as thin plating, per side: 2.5 gr
^{/ M 2,: 2.0 gr /} m 2,: 1. 5 gr /
m ² ,: 1. 0 gr / m ² ,: 0. 5 gr / m ²
It is an experiment for the case of.

【００１０】ぶりきの表面色調は目視により、次の５段
階で評価した。 ５．変色無し ４．変色少量有るが影響無し ３．変色少量有り局部で影響有り ２．変色多量有り大部分で影響有り １．変色多量全体で影響有り 酸化膜の測定は、緩衝溶液中で浸漬した上記鋼板サンプ
ルに一定電流を流し、陰極還元による表面電位の変化を
測定し、（１）式より求めた。 電気量×比例定数＝酸化膜厚（Å） （１）The surface color tone of tinplate was visually evaluated in the following five grades. 5. No discoloration 4. Small amount of discoloration but no effect 3. There is a small amount of discoloration. There is a large amount of discoloration. A large amount of discoloration has an effect on the measurement. The oxide film was measured by the formula (1) by applying a constant current to the steel sheet sample immersed in the buffer solution, measuring the change in surface potential due to cathodic reduction. Electricity x proportional constant = oxide film thickness (Å) (1)

【００１１】（２）図２は薄めっきしたＴＦＳの表面色
調とぶりき用冷延鋼板の焼鈍後の酸化膜厚との関係を示
す図である。ここでは薄めっきとして、片面当たり、
：２５０ｍｇ／ｍ² 、：２００ｍｇ／ｍ² 、：１
５０ｍｇ／ｍ² 、：１０0 ｍｇ／ｍ² 、：５０ｍｇ
／ｍ²の場合について実験したものである。ＴＦＳの表
面色調は上記と同じく、目視により、５段階で評価し
た。酸化膜の測定も上記と同じである。(2) FIG. 2 is a diagram showing the relationship between the surface color tone of thinly plated TFS and the oxide film thickness of the cold rolled steel sheet for tinning after annealing. Here, as thin plating, per side,
: 250 mg / m ² ,: 200 mg / m ² ,: 1
50 mg / m ² ,: 100 mg / m ² ,: 50 mg
It is an experiment for the case of / m ² . The surface color tone of the TFS was visually evaluated in the same manner as above, in 5 grades. The measurement of the oxide film is the same as above.

【００１２】（３）図１、図２から明らかなように、ぶ
りき、ＴＦＳは薄めっきにおいて焼鈍後の原板表面の酸
化膜の厚さが３０Å以下の場合は、色調による影響がな
い。ぶりき、ＴＦＳは厚めっきになると、表面の酸化膜
の厚さが３０Åを超えても色調による影響がない。(3) As is clear from FIGS. 1 and 2, tint and TFS are not affected by color tone when the thickness of the oxide film on the surface of the original plate after annealing in thin plating is 30 Å or less. In the case of tin plating and thick TFS, even if the thickness of the oxide film on the surface exceeds 30Å, it is not affected by the color tone.

【００１３】３）薄めっきぶりきの表面色調と酸化膜の
溶解到達時間との関係：図３は薄めっきぶりきの表面色
調と酸化膜の溶解到達時間（以降到達時間と云う）との
関係を示す図である。 （１）主な条件： （イ） 原板：連続焼鈍によって得られたもの。 （ロ） 薄めっきぶりき：片面当たり０．５ｍｇ／ｍ²
（記号で示す）。 （ハ） 表面色調の評価：図１、図２と同じように５段
階による。 （ニ） 到達時間：焼鈍後の鋼板表面の発生酸化膜生成
量を０．０５ｍｏｌ／ｌホウ酸ナトリウム溶液中に２５
℃で浸漬し、浸漬開始から溶解して鉄電位に到達するま
での時間。 （２）図３から明らかなように鉄電位までの到達時間は
１００秒を超えると表面色調が劣化する。3) Relationship between the surface color tone of the thin plating tinplate and the dissolution arrival time of the oxide film: FIG. 3 shows the relationship between the surface color tone of the thin plating tinplate and the dissolution arrival time of the oxide film (hereinafter referred to as the arrival time). FIG. (1) Main conditions: (a) Original plate: One obtained by continuous annealing. (B) Thin plating tin: 0.5 mg / m ² per side
(Indicated by symbols). (C) Evaluation of surface color tone: As in FIGS. (D) Arrival time: The amount of oxide film formed on the surface of the steel sheet after annealing was adjusted to 25 in a 0.05 mol / l sodium borate solution.
The time from the start of immersion to the dissolution and reaching the iron potential after immersion in ° C. (2) As is clear from FIG. 3, when the arrival time to the iron potential exceeds 100 seconds, the surface color tone deteriorates.

【００１４】４）酸化膜厚と到達時間との関係：図４は
酸化膜厚と到達時間との関係を示す図である。 （１）主な条件：上記と同じ （２）図４から明らかなように酸化膜厚を３０Å以下に
した場合は、鉄電位までの到達時間が１００秒以内にな
る。4) Relationship between oxide film thickness and arrival time: FIG. 4 is a diagram showing a relationship between oxide film thickness and arrival time. (1) Main conditions: same as above (2) As is clear from FIG. 4, when the oxide film thickness is 30 Å or less, the arrival time to the iron potential is within 100 seconds.

【００１５】５）本発明の限定理由：上記のことから、
本発明では焼鈍後の原板の酸化膜の厚さを３０Å以下に
限定したものであり、本発明の冷延鋼板を用いて、ぶり
き、ＴＦＳを製造した場合、そのめっき量に関係なく、
薄めっきでも、色調が良好で、表面ムラのない外観の優
れたものを得ることが出来る。5) Reasons for limiting the present invention: From the above reasons,
In the present invention, the thickness of the oxide film of the original plate after annealing is limited to 30 Å or less, and when the cold rolled steel sheet of the present invention is used to produce tinplate and TFS, regardless of the plating amount,
Even with thin plating, it is possible to obtain a product with a good color tone and an excellent appearance without surface unevenness.

【００１６】６）本発明の冷延鋼板を得るための製造方
法：本発明の酸化膜の厚さが３０Å以下である焼鈍後の
原板を得るためには、焼鈍前の冷延鋼板の残存付着水分
量を１０ｍｇ／ｍ² 以下にすることが必要である。図５
はぶりきおよびティンフリースチール用冷延鋼板の焼鈍
前の鋼板残存付着水分量と焼鈍後の酸化膜との関係を示
す図である。これは後述する図６に示すような連続焼鈍
ラインで、通常の焼鈍条件である表１に示す３つのパタ
ーンＡ、Ｂ、Ｃを選んで焼鈍したものである。6) Manufacturing method for obtaining the cold-rolled steel sheet of the present invention: In order to obtain an annealed original sheet having an oxide film thickness of 30 Å or less of the present invention, residual adhesion of the cold-rolled steel sheet before annealing It is necessary to set the water content to 10 mg / m ² or less. Figure 5
It is a figure which shows the relationship between the amount of moisture remaining in the steel sheet before annealing and the oxide film after annealing of the cold rolled steel sheet for tinting and tin-free steel. This is a continuous annealing line as shown in FIG. 6 which will be described later, and is one in which three patterns A, B and C shown in Table 1 which are normal annealing conditions are selected and annealed.

【００１７】[0017]

【表１】 [Table 1]

【００１８】表１によるＡの焼鈍条件の場合を○印、Ｂ
の焼鈍条件の場合を△印、Ｃの焼鈍条件の場合を□印と
して図５にプロットしたものである。図５から明らかな
ように、焼鈍後の原板の酸化膜を３０Å以下にするため
には、焼鈍前の冷延鋼板の残存付着水分量を１０ｍｇ／
ｍ² 以下にすることが必要である。The case of the annealing condition of A in Table 1 is indicated by a circle, and B is indicated by B
5 is plotted in FIG. 5 with Δ as the annealing condition of No. and as □ with the annealing condition of C. As is clear from FIG. 5, in order to reduce the oxide film of the original plate after annealing to 30 Å or less, the residual adhered water content of the cold rolled steel sheet before annealing is 10 mg /
It is necessary to make it m ² or less.

【００１９】７）バッチ焼鈍による場合：上述した図１
〜図５に示す検討をバッチ焼鈍による場合について行っ
たが、表面色調と酸化膜厚及び酸化膜厚と到達時間の関
係は連続焼鈍による場合と同様の結果が得られた。バッ
チ焼鈍においても焼鈍前の冷延鋼板の残存付着水分量を
１０ｍｇ／ｍ² 以下にすることにより、酸化膜厚３０Å
以下にすることが出来、薄めっきぶりき及びティンフリ
ースチール用原板として表面色調に優れ、光沢ムラのな
い冷延鋼板が得られる。7) In case of batch annealing: FIG. 1 mentioned above
The investigations shown in FIG. 5 were carried out for the case of batch annealing, and the results of the relationship between the surface color tone and the oxide film thickness and the relationship between the oxide film thickness and the arrival time were the same as those in the case of continuous annealing. Even in batch annealing, the oxide film thickness of 30 Å can be obtained by setting the residual adhered water content of the cold rolled steel sheet before annealing to 10 mg / m ² or less.
The following can be obtained, and a cold-rolled steel sheet having an excellent surface color tone and no gloss unevenness can be obtained as a thin plating tin plate and an original plate for tin-free steel.

【００２０】[0020]

【実施例】本発明のぶりきおよびティンフリースチール
用冷延鋼板は連続焼鈍又はバッチ焼鈍した原板であっ
て、前記原板の酸化膜の厚さが３０Å以下であるもので
ある。本発明のぶりきおよびティンフリースチール用冷
延鋼板の製造方法の一実施例について、図６を用いて説
明する。EXAMPLE A cold-rolled steel sheet for tinplate and tin-free steel according to the present invention is an original plate that is continuously annealed or batch annealed, and the thickness of the oxide film of the original plate is 30 Å or less. One embodiment of the method for producing a cold rolled steel sheet for tinplate and tin-free steel according to the present invention will be described with reference to FIG.

【００２１】連続焼鈍ラインの焼鈍炉の前処理工程で鋼
板１をアルカリ槽２でアルカリ電解洗浄を行った後、水
洗槽３で水洗を施し、鋼板１表裏に二段に設けたゴム製
リンガーロール４を圧着させて、水切りを行い、更に、
その上段で水分測定装置として、幅長の吸水紙層状体６
を押付装置８で鋼板１の表裏面に所定時間圧着させて、
その間に水分を吸収させ、それから鋼板１の付着水分量
を測定して、所定の水分量を超えた場合はゴム製リンガ
ーロール４の押付装置８を調整して、所定の水分量以下
にしてから、次の吸水リンガーロール５で付着水分を排
除し、その後高温乾燥器７で乾燥し所定の残存付着水分
量以下にする。ここでは焼鈍炉１２前の鋼板１の残存付
着水分量を赤外線水分測定装置１０で測定し、高温乾燥
器７にフィドバックしている。９、１１は調整機構であ
る。In the pretreatment process of the annealing furnace of the continuous annealing line, the steel plate 1 is subjected to alkaline electrolytic cleaning in the alkali tank 2 and then rinsed in the water washing tank 3, and the rubber ringer rolls provided on the front and back of the steel plate 1 in two stages. 4 is crimped, drained, and
In the upper part, as a moisture measuring device, a widthwise absorbent paper layered body 6
Is pressed against the front and back surfaces of the steel plate 1 for a predetermined time with the pressing device 8,
In the meantime, moisture is absorbed, and then the amount of attached moisture on the steel sheet 1 is measured. When the amount of moisture exceeds a predetermined amount, the pressing device 8 of the rubber ringer roll 4 is adjusted to make it equal to or less than the predetermined amount of water. Then, the adsorbed water is removed by the next water-absorbing Ringer roll 5 and then dried by the high temperature dryer 7 to a predetermined residual adhering water amount or less. Here, the amount of residual adhered water on the steel sheet 1 before the annealing furnace 12 is measured by the infrared moisture measuring device 10 and fed back to the high temperature dryer 7. Reference numerals 9 and 11 are adjustment mechanisms.

【００２２】吸水リンガーロール５と、高温乾燥器７で
二段の付着水分量の調整を行った場合は、高温乾燥器７
の負荷を軽減し、付着水分量の調整を的確に行うことが
出来る。しかし、これに限定されるものではなく、付着
水分量の調整にはゴム製リンガーロール４に代わって、
熱風等を吹付けて付着水分量を所定量以下にすることも
出来る。水分測定装置６は上記のような鋼板１の幅長の
吸水紙の層状体を用いた場合の簡易測定装置から、赤外
線等を利用した高度な測定装置等まで適宜用いることが
出来る。When the amount of attached water is adjusted in two stages by the water absorbing ringer roll 5 and the high temperature dryer 7, the high temperature dryer 7 is used.
The load of can be reduced and the amount of attached water can be adjusted accurately. However, the present invention is not limited to this, and instead of the rubber ringer roll 4 for adjusting the amount of attached water,
It is also possible to blow hot air or the like to reduce the amount of attached water to a predetermined amount or less. The moisture measuring device 6 can be appropriately used from a simple measuring device using a layered body of water-absorbent paper having the width of the steel plate 1 to a sophisticated measuring device using infrared rays or the like.

【００２３】次に図６に示すような装置を用いて、本発
明の冷延鋼板を製造する場合の一実施例を具体的に説明
する。 （実施例１）厚さ０．２ｍｍ、０．３２ｍｍ、０．５ｍ
ｍのぶりき用冷延鋼板の場合である。実験Ｎｏ．１とし
て、リンガーロールに、市販の吸水リンガーロールで、
多数の小孔を持つ極細繊維不織布で覆われた中空軸を備
えたロール構造のものを用いた。Next, one embodiment for producing the cold-rolled steel sheet of the present invention using the apparatus shown in FIG. 6 will be specifically described. (Example 1) Thickness 0.2 mm, 0.32 mm, 0.5 m
This is the case of a cold-rolled steel sheet for tinplate having a size of m. Experiment No. 1, as a ringer roll, a commercially available water-absorbing ringer roll,
A roll structure having a hollow shaft covered with an ultrafine fiber nonwoven fabric having a large number of small holes was used.

【００２４】ぶりき用冷延鋼板の吸水リンガーロールの
入側付着水を０．２ｇｒ／ｍ² に調整して、上記吸水リ
ンガーロールで付着水分量を０．１ｇｒ／ｍ² 以下と
し、熱風循環型の高温乾燥器（雰囲気温度１１０℃、風
量１００Ｎｍ³ ／分）で０．３秒処理して本発明の実験
Ｎｏ. １の冷延鋼板とした。The adhering water on the inlet side of the water-absorbing Ringer roll of the cold-rolled steel plate for tinplate was adjusted to 0.2 gr / m ² , and the amount of water adhering to the water-absorbing Ringer roll was adjusted to 0.1 gr / m ² or less, and hot air was circulated. A cold-rolled steel sheet of Experiment No. 1 of the present invention was obtained by performing a 0.3 second treatment with a mold type high temperature dryer (atmosphere temperature 110 ° C., air volume 100 Nm ³ / min).

【００２５】実験Ｎｏ．２として、市販のゴム製のリン
ガーロールのみを３個用い、その後Ｎｏ．１と同一の雰
囲気温度、風量で１秒処理して本発明の冷延鋼板を得
た。比較として、市販のリンガーロールのみを３個用
い、その後同じ高温乾燥器で０．３秒処理して比較例の
冷延鋼板とした。表２に本発明の実験Ｎｏ．１、実験Ｎ
ｏ．２と比較例についての高温乾燥器７直後の位置( 焼
鈍前）で測定した鋼板表面の残存付着水分量の結果を示
す。Experiment No. As No. 2, only three commercially available rubber ringer rolls were used, and then No. 2 was used. The cold rolled steel sheet of the present invention was obtained by treating for 1 second at the same atmospheric temperature and air flow rate as in No. 1. For comparison, only three commercially available ringer rolls were used, and then treated with the same high temperature dryer for 0.3 seconds to obtain a cold rolled steel sheet of a comparative example. Table 2 shows the experiment No. of the present invention. 1. Experiment N
o. 2 shows the results of the amount of residual adhered water on the surface of the steel sheet measured at the position immediately after the high-temperature dryer 7 (before annealing) in Example 2 and Comparative Example.

【００２６】[0026]

【表２】 [Table 2]

【００２７】本発明の実験Ｎｏ．１、実験Ｎｏ．２では
鋼板の板厚、移動速度を変化させても、鋼板中央部、端
部ともに、その表面の残存付着水分が１０ｍｇ／ｍ² 以
下に調整されている。Experiment No. 1 of the present invention. 1, Experiment No. In No. 2, even if the plate thickness and the moving speed of the steel plate are changed, the residual adhering water content on the surface of the steel plate is adjusted to 10 mg / m ² or less at both the central part and the end part of the steel plate.

【００２８】比較例では鋼板中央部の表面の残存付着水
分量は鋼板の移動速度の増加と共に増え、１０ｍｇ／ｍ
² を超えるものもあり、鋼板端部は鋼板の板厚、移動速
度の変化に関係なく、いずれも１０ｍｇ／ｍ² を大きく
超えた。In the comparative example, the residual adhered water content on the surface of the central portion of the steel sheet increases with an increase in the moving speed of the steel sheet and is 10 mg / m 2.
^Some of the values exceeded ² , and the steel plate edges greatly exceeded 10 mg / m ² irrespective of changes in the plate thickness and moving speed of the steel plate.

【００２９】更に上記０．２ｍｍと０．５ｍｍの冷延鋼
板を通板速度４００ｍｐｍとし、実験Ｎｏ．１、実験Ｎ
ｏ．２、比較例と同じ付着水分量の調整を行ない、連続
焼鈍を行った。焼鈍工程の各帯の処理温度と、処理時間
は次の通りである。加熱帯６２０℃、２５秒、均熱帯６
２０℃、１９秒、徐冷帯４２０℃、２８秒、急冷帯８０
℃以下、２８秒である。上記焼鈍後の鋼板表面に発生し
た酸化膜厚、到達時間の結果を表３に示す。Further, the cold rolling steel sheet of 0.2 mm and 0.5 mm was set to a strip speed of 400 mpm, and the test No. 1. Experiment N
o. 2. The same amount of attached water as in the comparative example was adjusted and continuous annealing was performed. The processing temperature and processing time of each zone of the annealing process are as follows. Heating zone 620 ° C, 25 seconds, soaking zone 6
20 ℃, 19 seconds, slow cooling zone 420 ℃, 28 seconds, quenching zone 80
28 ° C. or less. Table 3 shows the results of the oxide film thickness generated on the steel sheet surface after the annealing and the arrival time.

【００３０】[0030]

【表３】 [Table 3]

【００３１】本発明の実験Ｎｏ．１、実験Ｎｏ．２では
板厚０．２ｍｍと０．５ｍｍのどちらの鋼板も、鋼板全
面にわたって、到達時間が１００秒以内で且つ酸化膜の
厚さ３０Å以下に抑制され、鋼板中央部と端部の酸化膜
の差が小さいのに対して、比較例では到達時間が鋼板端
部で１００秒超えが発生し、また酸化膜の厚さも鋼板端
部で３０Åを超え、鋼板中央部と端部との差が大きい。Experiment No. 3 of the present invention. 1, Experiment No. In No. 2, in both steel plates having a thickness of 0.2 mm and 0.5 mm, the arrival time is suppressed to 100 s or less and the thickness of the oxide film is 30 Å or less over the entire surface of the steel plate. While the difference is small, the arrival time exceeds 100 seconds at the steel plate edge in the comparative example, and the thickness of the oxide film also exceeds 30Å at the steel plate edge, and the difference between the steel plate central part and the edge part is large. .

【００３２】次に、上記焼鈍後の０．２ｍｍと０．５ｍ
ｍの鋼板を伸張率１．５％で調質圧延（スキンパス）
（圧下荷重１スタンド：１．２トン／ｍｍ、２スタン
ド：０．８トン／ｍｍ）して、ぶりき用鋼板とした後、
片面当たり、１．５ｇ／ｍ² の薄錫めっきし、外観判定
として、表面色調と表面ムラを検査した。表面色調の評
価方法及び基準は前述の通りである。Next, 0.2 mm and 0.5 m after the above annealing
temper rolling of 1.5 m steel sheet at an elongation rate of 1.5% (skin pass)
(Reducing load 1 stand: 1.2 tons / mm, 2 stands: 0.8 tons / mm) to make a steel plate for tinplate,
A thin tin plating of 1.5 g / m ^{2 was applied} per one side, and the surface color tone and surface unevenness were inspected as the appearance judgment. The evaluation method and standard of the surface color tone are as described above.

【００３３】ここでは表面ムラの検査は（２）式で鋼板
表面欠陥混入率を求めた。 鋼板表面欠陥混入率＝鋼板表面欠陥面積／鋼板表面面積×１００ （２） ここではレーザー式表面欠陥検出装置を用いた。即ち表
面欠陥混入率は酸化膜の不均一な残存に起因するＳｎの
電析形態の異常による光沢のむらを表す。その結果を表
４に示す。Here, the surface unevenness was inspected by using the formula (2) to obtain the steel plate surface defect mixing rate. Steel plate surface defect mixing rate = steel plate surface defect area / steel plate surface area × 100 (2) Here, a laser type surface defect detection device was used. That is, the surface defect mixing rate represents uneven gloss due to an abnormal Sn electrodeposition morphology resulting from the non-uniform remaining of the oxide film. The results are shown in Table 4.

【００３４】[0034]

【表４】 [Table 4]

【００３５】本発明の実験Ｎｏ．１、実験Ｎｏ．２では
板厚０．２ｍｍと０．５ｍｍの鋼板のどちらも表面色調
が良好であり、表面ムラを表す表面欠陥混入率は比較例
と比較して、低い結果となっている。Experiment No. 3 of the present invention. 1, Experiment No. In No. 2, the surface color tone is good for both the steel plates having the plate thicknesses of 0.2 mm and 0.5 mm, and the surface defect mixing ratio indicating the surface unevenness is lower than that of the comparative example.

【００３６】比較例において（１）は鋼板中央部、
（２）は鋼板端部の結果を示している。なお、実験Ｎ
ｏ．１、Ｎｏ．２は鋼板中央部と端部の値に顕著な差は
ないので、中央部の値を示した。一般には表面欠陥混入
率が０．１％を超えた場合は悪いと評価されている。In the comparative example, (1) is the central portion of the steel plate,
(2) has shown the result of the steel plate edge part. Experiment N
o. 1, No. No. 2 has no significant difference between the values of the central portion and the end portion of the steel sheet, so the value of the central portion is shown. Generally, it is evaluated as bad when the surface defect mixing rate exceeds 0.1%.

【００３７】（実施例２）ＴＦＳ用の冷延鋼板の場合で
ある。上記実施例１と同様の処理を焼鈍した０．２０ｍ
ｍと０．５ｍｍの鋼板をＴＦＳ用鋼板とした後、片面当
たり、１００ｍｇ／ｍ² の電解クロメート処理を行い、
外観判定として、表面色調を検査し、前述の表面色調の
評価方法及び基準により、良否の評価を行った。その結
果を表５に示す。(Example 2) This is a case of a cold rolled steel sheet for TFS. 0.20 m annealed by the same process as in Example 1 above
m and 0.5 mm steel plates were used as TFS steel plates, and then 100 mg / m ² of electrolytic chromate treatment was applied to each surface.
As the appearance determination, the surface color tone was inspected, and the quality was evaluated by the above-described surface color tone evaluation method and standard. The results are shown in Table 5.

【００３８】[0038]

【表５】 [Table 5]

【００３９】本発明の実験例は板厚０．２０ｍｍと０．
５ｍｍの鋼板のどちらも外観が全面に渡って変色が無
く、均一な色調を呈していた。これに対して、比較例で
は変色が多く発生している。In the experimental example of the present invention, the plate thicknesses of 0.20 mm and 0.
Both 5 mm steel sheets had a uniform color tone with no discoloration over the entire surface. On the other hand, in the comparative example, a large amount of discoloration occurred.

【００４０】（実施例３）冷延鋼板の０．２ｍｍと０．
５ｍｍの鋼板を通板速度４００ｍｐｍとし、実験Ｎｏ
１、実験Ｎｏ２、比較例の付着水分の調整を行ない、バ
ッチ焼鈍を行った。焼鈍工程の各帯の処理温度と、処理
時間は図７に示す通り焼鈍時間を４０時間とし、均熱帯
の温度を６７０℃とした。焼鈍後の鋼板表面の酸化膜厚
さ及び到達時間は、前述の通りに求めた。その結果を表
６に示す。(Example 3) 0.2 mm of cold rolled steel sheet and 0.
A 5 mm steel plate was run at a speed of 400 mpm, and an experiment No.
Batch adhesion was adjusted by adjusting the adhering water content of No. 1, Experiment No. 2 and Comparative Example. As for the processing temperature and the processing time of each zone of the annealing step, the annealing time was 40 hours and the soaking temperature was 670 ° C. as shown in FIG. 7. The oxide film thickness on the steel sheet surface after annealing and the arrival time were obtained as described above. The results are shown in Table 6.

【００４１】[0041]

【表６】 [Table 6]

【００４２】本発明の実験Ｎｏ．１、実験Ｎｏ．２では
板厚０．２ｍｍと０．５ｍｍのどちらの鋼板も、鋼板全
面にわたって、鉄電位までに到達するまでの時間が１０
０秒以内で且つ酸化膜の厚さ３０Å以下に抑制され、鋼
板中央部と端部の酸化膜の差が小さいのに対して、比較
例では鉄電位までに到達するまでの時間が鋼板端部で１
００秒超えが発生し、また酸化膜の厚さも鋼板端部で３
０Åを超え、鋼板中央部と端部との差が大きい。Experiment No. of the present invention. 1, Experiment No. In No. 2, in both steel plates with thicknesses of 0.2 mm and 0.5 mm, the time required to reach the iron potential is 10 over the entire surface of the steel plate.
Within 0 seconds, the thickness of the oxide film was suppressed to 30 Å or less, and the difference between the oxide film at the central portion and the edge portion of the steel sheet was small, whereas in the comparative example, the time until reaching the iron potential was at the steel sheet edge portion. In 1
Over 00 seconds occurred, and the thickness of the oxide film was 3 at the edge of the steel plate.
It exceeds 0Å, and the difference between the center and the end of the steel plate is large.

【００４３】次に、上記焼鈍後の板厚０．２ｍｍと０．
５ｍｍの鋼板を伸張率１．５％で調質圧延（スキンパ
ス）（圧下荷重１スタンド：１．２トン／ｍｍ、２スタ
ンド：０．８トン／ｍｍ）し、ぶりき用鋼板とした後、
片面当たり、１．５ｇ／ｍ² の薄錫めっきし、外観判定
として、表面色調と表面ムラを検査し、良否評価を行っ
た。表面ムラの検査は連続焼鈍の場合と同様に、レーザ
ー式表面欠陥検出装置を用い上述の（２）式で鋼板表面
欠陥混入率を求めた。結果を表７に示す。Next, after the above-mentioned annealing, the plate thickness of 0.2 mm and 0.
After temper rolling (skin pass) of 5 mm steel plate at an elongation rate of 1.5% (rolling load 1 stand: 1.2 tons / mm, 2 stands: 0.8 tons / mm) to make a steel plate for tinplate,
One side was thinly plated with 1.5 g / m ² of thin tin, and the appearance was judged by inspecting the surface color tone and the surface unevenness and evaluating the quality. In the surface unevenness inspection, as in the case of continuous annealing, the steel plate surface defect mixing ratio was obtained by the above-mentioned formula (2) using a laser type surface defect detection device. The results are shown in Table 7.

【００４４】[0044]

【表７】 [Table 7]

【００４５】本発明の実験Ｎｏ．１、実験Ｎｏ．２では
板厚０．２ｍｍと０．５ｍｍの鋼板のどちらも表面色調
が良好であり、表面欠陥混入率は全て０．１％以下であ
った。比較例において（１）は鋼板中央部、（２）は鋼
板端部の結果を示している。なお、実験Ｎｏ．１、Ｎ
ｏ．２は鋼板中央部と端部の値に顕著な差はないので、
中央部の値を示した。Experiment No. of the present invention. 1, Experiment No. In No. 2, the surface color tone was good for both the steel plates having a plate thickness of 0.2 mm and 0.5 mm, and the surface defect mixing ratios were all 0.1% or less. In the comparative example, (1) shows the results of the central portion of the steel sheet, and (2) shows the results of the end portions of the steel sheet. In addition, the experiment No. 1, N
o. No. 2 has no significant difference between the values at the center and edge of the steel plate, so
The value in the center is shown.

【００４６】[0046]

【発明の効果】以上のように、本発明のぶりき又はＴＦ
Ｓ用冷延鋼板は焼鈍後の鋼板表面の酸化膜が均一且つ低
く抑制しているので、薄めっきによりぶりき又はＴＦＳ
を製造し缶材として使用した場合でも、外観が十分に満
足出来る。As described above, the tin plate or TF of the present invention is used.
Since the cold-rolled steel sheet for S suppresses the oxide film on the surface of the steel sheet after annealing uniformly and low, tin plating or TFS is caused by thin plating.
Even when manufactured and used as a can material, the appearance is sufficiently satisfactory.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の薄めっきしたぶりきの表面色調とぶり
き用冷延鋼板の焼鈍後の酸化膜厚の関係を示す図であ
る。FIG. 1 is a diagram showing the relationship between the surface color tone of a tin-plated tinplate of the present invention and the oxide film thickness of the cold-rolled steel sheet for tinplate after annealing.

【図２】本発明の薄めっきしたＴＦＳの表面色調とぶり
き用冷延鋼板の焼鈍後の酸化膜厚の関係を示す図であ
る。FIG. 2 is a diagram showing the relationship between the surface color tone of the thinly plated TFS of the present invention and the oxide film thickness of the cold rolled steel sheet for tinting after annealing.

【図３】本発明の表面色調と鉄電位までの到達時間との
関係を示す図である。FIG. 3 is a diagram showing the relationship between the surface color tone of the present invention and the arrival time to the iron potential.

【図４】本発明の焼鈍後の酸化膜厚と鉄電位までの到達
時間との関係を示す図である。FIG. 4 is a diagram showing the relationship between the oxide film thickness after annealing and the arrival time to the iron potential according to the present invention.

【図５】本発明のぶりきおよびティンフリースチール用
冷延鋼板の焼鈍前の残存付着水分量と焼鈍後の酸化膜厚
との関係を示す図である。FIG. 5 is a diagram showing the relationship between the amount of residual adhered water before annealing and the oxide film thickness after annealing of the cold-rolled steel sheet for tinplate and tin-free steel according to the present invention.

【図６】本発明のぶりきおよびティンフリースチール用
冷延鋼板を製造する場合の焼鈍炉前の工程の一実施例を
示す図である。FIG. 6 is a diagram showing an example of the process before the annealing furnace in the case of manufacturing the cold-rolled steel sheet for tinplate and tin-free steel according to the present invention.

【図７】バッチ焼鈍の焼鈍工程の各帯の処理温度と、処
理時間の関係を示す図である。FIG. 7 is a diagram showing the relationship between the processing temperature and processing time of each zone in the annealing process of batch annealing.

【符号の説明】[Explanation of symbols]

１ 鋼板 ２ アルカリ槽 ３ 水洗槽 ４ ゴム製リンガーロール ５ 吸水リンガーロール ６ 水分測定装置（幅長の吸水紙層状体） ７ 高温乾燥器 ８ 押付装置 ９、１１ 調整機構 １０ 赤外線水分測定装置 １２ 焼鈍炉 DESCRIPTION OF SYMBOLS 1 Steel plate 2 Alkaline tank 3 Rinsing tank 4 Rubber ringer roll 5 Water absorbing ringer roll 6 Moisture measuring device (width absorbent paper layered body) 7 High temperature dryer 8 Pressing device 9, 11 Adjusting mechanism 10 Infrared moisture measuring device 12 Annealing furnace

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 焼鈍した原板であって、前記原板表面の
酸化膜の厚さが３０Å以下であることを特徴とするぶり
き又はティンフリースチール用冷延鋼板。1. A cold-rolled steel sheet for tin or tin-free steel, which is an annealed original sheet and has an oxide film thickness of 30 Å or less on the surface of the original sheet.