JPS5964783A - Method for manufacturing hot-rolled steel sheets with excellent chemical conversion treatment properties - Google Patents
Method for manufacturing hot-rolled steel sheets with excellent chemical conversion treatment propertiesInfo
- Publication number
- JPS5964783A JPS5964783A JP17285182A JP17285182A JPS5964783A JP S5964783 A JPS5964783 A JP S5964783A JP 17285182 A JP17285182 A JP 17285182A JP 17285182 A JP17285182 A JP 17285182A JP S5964783 A JPS5964783 A JP S5964783A
- Authority
- JP
- Japan
- Prior art keywords
- rolled steel
- steel plate
- hot
- chemical conversion
- steel 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 37
- 238000011282 treatment Methods 0.000 title claims abstract description 33
- 239000000126 substance Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000000034 method Methods 0.000 title abstract description 9
- 230000007797 corrosion Effects 0.000 claims abstract description 18
- 238000005260 corrosion Methods 0.000 claims abstract description 18
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 238000005554 pickling Methods 0.000 abstract description 12
- 239000003792 electrolyte Substances 0.000 abstract description 9
- 238000002161 passivation Methods 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- RHDGNLCLDBVESU-UHFFFAOYSA-N but-3-en-4-olide Chemical compound O=C1CC=CO1 RHDGNLCLDBVESU-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWHXWYVOWJCXSI-UHFFFAOYSA-N phosphoric acid;hydrate Chemical compound O.OP(O)(O)=O TWHXWYVOWJCXSI-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrochemical Coating By Surface Reaction (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は脱スケールされた熱延鋼板における化成処理
性の同上を図った熱延鋼板の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a hot-rolled steel sheet that is improved in chemical conversion treatment properties in a descaled hot-rolled steel sheet.
自動車用熱延鋼板は、素材として酸洗によシ脱スケール
しだ熱延鋼板を用い、これに例えばリン酸塩水溶液によ
る化成処理を行い、その」二に塗装を施して用いられる
のが通例である。そして鋼板の強度を確保するためには
従来、素材に稍々厚目の鋼板を用い、その肉厚によって
耐食性および腐食強度ｔカバーする方法かとられていた
・従って従来は、鋼板の耐食性の向上を図るという目的
で化成処理性を改善するような試みは何等行われておら
ず、脱スケールされだ熱延鋼板は冷延鋼板等に較べて化
成処理性かやや劣っているという観念で使用するのか大
勢を占めていた。Hot-rolled steel sheets for automobiles are typically made of hot-rolled steel sheets that have been descaled by pickling, which is then subjected to a chemical conversion treatment using, for example, an aqueous phosphate solution, and then painted. It is. In order to ensure the strength of a steel plate, the conventional method was to use a slightly thicker steel plate as a material, and the thickness covered the corrosion resistance and corrosion strength.Therefore, in the past, it was necessary to improve the corrosion resistance of the steel plate. No attempt has been made to improve chemical conversion treatment properties for the purpose of improving chemical conversion treatment properties, and should descaled hot-rolled steel sheets be used with the idea that their chemical conversion treatment properties are slightly inferior to cold-rolled steel sheets, etc.? They occupied a large number of people.
一方、最近の自動車用鋼板は軽量化のニーズから高強度
７専肉化の頌向か益々高まってきており、自動車用の熱
延鋼板も同様の傾向にある。しかし素材鋼板か薄肉化・
されると、僅かな部分的腐食によってもその価値が大き
く損われることになるので、従来の如く素材の肉厚によ
って腐食強度をカバーすることかできなくなり、必然的
に塗装等の表面匙埋技術によって鋼板の耐食性を確保し
ＩＩＩＩ」食寿命の延命を図らざるを得なくなる。自動
車用鋼板の上記塗装耐食性を向」ニさせる重要な因子は
、塗装の下地処理である化成処理の良否にあるので、自
動車用の高強度薄肉熱延鋼板の化成処ｊ里性の向上対策
か最近強く望まれるようになってきた。On the other hand, in recent years, there has been an increasing trend toward high-strength 7-layer steel sheets for automobiles due to the need for weight reduction, and hot-rolled steel sheets for automobiles are also following the same trend. However, the material steel plate has become thinner and
In this case, even a slight local corrosion will greatly reduce its value, so it is no longer possible to compensate for the corrosion strength with the thickness of the material as in the past, and it becomes necessary to use surface embedding techniques such as painting. Therefore, it is necessary to ensure the corrosion resistance of the steel plate and extend its corrosion life. An important factor in improving the above-mentioned corrosion resistance of automotive steel sheets lies in the quality of chemical conversion treatment, which is the base treatment for painting, so it is important to take measures to improve the chemical conversion properties of high-strength, thin-walled hot-rolled steel sheets for automobiles. Recently, it has become highly desired.
本発明は−１−記要望に応えるべくなされたものであっ
て、脱スケールされた熱延鋼板面に良好な化成皮膜の生
成を図り、化成処理性にすぐれた熱延鋼板の製造方法の
提供を目的とする。The present invention has been made in response to the need -1-, and provides a method for producing a hot-rolled steel sheet with excellent chemical conversion treatment properties by forming a good chemical conversion film on the surface of a descaled hot-rolled steel sheet. With the goal.
本発明者らは脱スケールされた熱延鋼板の化成処理性の
劣化の原因を究明するとともにその改善方法を開発すべ
く種々実験研究を重ねた。その結果、まず」二記熱延鋼
阪の化成処理性を劣化させる原因については次の■〜■
か挙げられることが判明した。The present inventors have conducted various experimental studies in order to investigate the cause of deterioration in the chemical conversion treatability of descaled hot rolled steel sheets and to develop methods for improving the same. As a result, the following ■~■
It turns out that there are several things that can be mentioned.
■ 酸洗により脱スケールされた熱延鋼板は、冷延鋼板
にみられるようなＩＶＩｎ、Ｐの表面濃化した選択酸化
層か酸洗により除去されているので、化成処理に際して
良好なリン酸塩皮膜の結晶の生成が得られないこと。■ Hot-rolled steel sheets that have been descaled by pickling have a selective oxidation layer that is concentrated on the surface of IVIn and P, as seen in cold-rolled steel sheets, or have been removed by pickling, so they have a good phosphate layer during chemical conversion treatment. No formation of film crystals.
■ 酸洗残査の表面吸着、水洗後の水ｊ模にょる黄詰層
の生成（以下腐食生成物という）があり、これらは化成
処理時にリン酸塩水酸液にょる電解が困難で、表面にア
ノード部、カンード部として固定し、化成結晶の該発生
や成長を阻害すること。■ There is surface adsorption of pickling residues and the formation of a yellow layer (hereinafter referred to as corrosion products) in the water after washing, and these are difficult to electrolyze with phosphate hydroxide during chemical conversion treatment, to be fixed as an anode part and a cand part to inhibit the generation and growth of chemical crystals.
■ 高張力化のために添加された合金元素の量か増える
だめ、これらの合金元素か」−記と同様に化成結晶の核
発生やＦ成長をｔｉｌ−１害すること。■ If the amount of alloying elements added to increase the tensile strength increases, these alloying elements will harm the nucleation and F growth of chemical crystals.
−１−記化成処理性劣化の中実を踏まえた」二で、さら
に化成処理性を高めるべく実験、研冗を重ねた結果、ｌ
酸洗後の脱スケールされだ熱延鋼板を陽極として電解処
理することにより、この熱延鋼板の化成処理上を冷延鋼
板並のすぐれた水準才で改善することかできるという新
らたな中実を知見した。-1- Taking into account the actual deterioration of chemical conversion processability, in 2, as a result of repeated experiments and research to further improve chemical conversion processability, l
By electrolytically treating a hot rolled steel sheet that has been descaled after pickling and using it as an anode, it is possible to improve the chemical conversion treatment of this hot rolled steel sheet at a level comparable to that of a cold rolled steel sheet. I found out the truth.
すなわら、酸洗後の脱スケールされた熱延鋼板を陽極と
して電解処理すると、熱延鋼板面に鋼板の溶Ｉｌｊイ又
応と激しい酸素発生反応とを生じ、その後鋼板表面に不
動態皮膜の生成（以下不動態化という）か得られる。そ
の際上記鋼板表１ｍｌに付着した１（′４食生成物が完
全に除去されるとともに不動態皮膜の生成によって電解
処理後水洗時の水膜にょる黄錆層の生成が効果的に防止
される。まだ」二記不動態化の進んだ熱延鋼板を化成処
理すると、酸化物の緻密なＮ膜である不動態皮膜に不向
−１局所的な溶解が容易に生じ、アノード部カソード部
の固定かなく、化成結晶の核発生や成長がスムーズに進
行し、良好な化成処理性を示すに至るのである。In other words, when a descaled hot-rolled steel sheet after pickling is electrolytically treated as an anode, a molten metal reaction and an intense oxygen generation reaction occur on the surface of the hot-rolled steel sheet, and then a passive film is formed on the surface of the steel sheet. (hereinafter referred to as passivation) can be obtained. At this time, the 1('4) food products adhering to 1 ml of the above steel plate surface were completely removed, and the formation of a passive film effectively prevented the formation of a yellow rust layer due to the water film during water washing after electrolytic treatment. When a hot rolled steel sheet with advanced passivation is subjected to chemical conversion treatment, local dissolution easily occurs in the passivation film, which is a dense N film of oxides, causing damage to the anode and cathode regions. Without fixation, the nucleation and growth of chemical crystals proceed smoothly, resulting in good chemical conversion treatment properties.
本発明は」二記知見に基いてなされたもので、その要旨
とするところは、脱スケールされだ熱延鋼板を陽極とし
て電解し、前記電解による熱延鋼板の溶解反応および酸
素発生反応によって熱延鋼板面」二の腐食生成物勿除す
るとともに前記電解により熱延納板面に不動態皮膜を生
成させ、熱延鋼板の化成処理性を向上させることを特敵
とする化成処理性にすぐれた熱延鋼板の製造方法にある
。The present invention has been made based on the findings described in section 2, and its gist is to electrolyze a descaled hot-rolled steel sheet as an anode, and to generate heat by the melting reaction and oxygen generation reaction of the hot-rolled steel sheet caused by the electrolysis. It has excellent chemical conversion treatment properties, with the special enemy of removing corrosion products on the surface of the rolled steel sheet and generating a passive film on the surface of the hot rolled steel sheet through the electrolysis, thereby improving the chemical conversion treatment properties of the hot rolled steel sheet. It is in the manufacturing method of hot-rolled steel sheets.
次に本発明の熱延鋼板の製造方法を図面に基いて説明す
る。Next, a method for manufacturing a hot rolled steel sheet according to the present invention will be explained based on the drawings.
第１図は本発明方法の一例を示す熱延鋼板の酸洗処理ラ
インの模式図である。FIG. 1 is a schematic diagram of a hot-rolled steel plate pickling treatment line showing an example of the method of the present invention.
図において、アシコイラー（２）から連続的に送り出さ
れる鋼板（１）は、ウエルダー（３）、フラッシュトリ
マ（４）、プロセッサ（５）を経て酸洗槽（６）に入り
脱スケールされた後、水洗４′！１（７）、陽極処理槽
（８）にて電解処理された後水洗糟（９）、ドライヤー
００を通りリコイラー（２′）で再びコイルに巻取られ
て次工程に送られる。In the figure, a steel plate (1) is continuously sent out from a reed coiler (2), passes through a welder (3), a flash trimmer (4), a processor (5), enters a pickling tank (6), and is descaled. Wash 4′! 1 (7), after being subjected to electrolytic treatment in the anodizing tank (8), it passes through a water wash (9), a dryer 00, is wound into a coil again in a recoiler (2'), and is sent to the next process.
第２図は上記陽極処理４ｇ （３）の機構を示す説明図
で側面図である。第２図において、（１１）は電解４・
ｊｌｉ、０のは電解液、（Ｊ：Ｈ■は電解？ｆｉ、（Ｊ
２中に］−下に適当間隔に並列に設けられた陰極、Ｑ４
）はりンノ°ノーロールである。脱スケールされた熱延
鋼板（１）は前記リンガ−ロールθ→で陽極に印加され
た後電解（・獣ｌＯに入り電解液０功に浸漬しながら陰
極（１３）（ｎ間を矢印（ａ）方向に通１反し電解され
る。θ！５はシンキングロール、μＧ）は収りロールで
ある。FIG. 2 is an explanatory side view showing the mechanism of the anodic treatment 4g (3). In Figure 2, (11) is the electrolytic 4.
jli, 0 is electrolyte, (J:H■ is electrolyte?fi, (J
2] - cathodes provided in parallel at appropriate intervals below, Q4
) No roll. The descaled hot-rolled steel sheet (1) is applied to the anode with the ringer roll θ→, and then electrolyzed (1), and while immersed in the electrolyte, the cathode (13) (arrow between n and ) is electrolyzed in one direction. θ!5 is a sinking roll, μG) is a converging roll.
このように脱スケールされた熱延鋼板（１〕を陽極とし
て電解すると、鋼板（１）の表裏面の陽極からは金属の
溶解反応および激しい酸素発生反応が起り、前記反応に
よって鋼板（１）ａ１］に・（」宥した腐食生成物の完
全な除去か行われるとともに除去後の鋼板面の不動態化
か進むのである。When the hot-rolled steel sheet (1) descaled in this way is used as an anode for electrolysis, a metal dissolution reaction and an intense oxygen generation reaction occur from the anodes on the front and back surfaces of the steel sheet (1), and as a result of the reaction, the steel sheet (1) a1 ]・("Complete removal of the subdued corrosion products is carried out, and the passivation of the steel plate surface after removal progresses.
」二記ｚ ＪＩｌ’Ｊ ｇとシテハ常用）Ｎａ、ＳＯ，
、Ｎａ２５ｏ４＋１シｓｏ６、Ｎａ２５ｏ４＋Ｎａ０Ｉ
−１，Ｈ２ＳＯ４等の水溶液が用いられ、ｌＮａ２ｓｏ
ｌ、１（、、ＳＯ４の濃度としては１０％程度が好まし
い。電化成処理性評価１１ｊｄの○印は化成結晶か微細
で、かつ緻密に生成し良好なもの、Ｘ印は化成結晶か粗
大で緻密でなく不良なもの示ず。” 2 z JIl'J g and Shiteha regular use) Na, SO,
, Na25o4+1 so6, Na25o4+Na0I
-1, H2SO4 and other aqueous solutions are used, lNa2so
The concentration of SO4 is preferably about 10%.The ○ marks in Electrochemical Treatability Evaluation 11jd are chemical crystals that are fine and densely formed and are good, and the X marks are chemical crystals that are coarse or coarse. It is not precise and shows no defects.
表に見る通り、比較例（１）は脱スケール鋼板に電解処
理を施さないため不動態皮１模の生成かなくかつ腐食生
成物か多く残イｔしているため、化成処理性か極めて不
良であった・これに対し本発明例ｍ〜（４）ばいづれも
電）リイ処理により腐食生成物は完全に除去され、かつ
銀白色の美麗な不動態皮膜か生ＩＪえされ、艮好な化成
処理匪かｆ４Ｊられた。萄に本発明例（２）は代表的な
電解液組成、 ｐＨ、ラインスピード、電流に０度等の
７ｈ解条件での電ｊイ例であり、本発明例（１）は上記
電解液に１らＳＯ４を加えて１設性液としノこ場１′〒
、本発明レリ（３）ｉ”Ｊ： ｆ’Ｊａ０１（全加えて
アルカリ性液としだ場面の電）９１例である。まだ本発
明例（４）は電解液に１−■２ＳＯ４を用いＩ）ｌ−１
１の強酸液どした」局舎電１ｆ＋イ効率か上昇して電流
密度を１氏くしても良好な不動態皮膜かｒＩＪられる例
全示したものである。As shown in the table, Comparative Example (1) did not undergo electrolytic treatment on the descaled steel sheet, so no passive film was formed and a large amount of corrosion products remained, so the chemical conversion treatment properties were extremely poor. In contrast, the corrosion products in all of Examples M to (4) of the present invention were completely removed by the electrolytic treatment, and a beautiful silvery-white passive film was formed, giving it an attractive appearance. A chemical conversion treatment was applied to the F4J. Example (2) of the present invention is an example of electrolysis under typical electrolyte composition, pH, line speed, and 7-hour solution conditions such as 0 degrees of current, while Example (1) of the present invention is an example of electrolyte composition using Add 1 SO4 and prepare a 1-set liquid toshinokoba1'〒
, Inventive example (3) i"J: f'Ja01 (all plus alkaline liquid and electrolyte in the scene) is 91 examples. Inventive example (4) uses 1-■2SO4 as the electrolyte I) l-1
All examples are shown in which a good passive film can be obtained even if the current density is increased by 1 degree Celsius and the power density of the local power station 1f+I is increased by using a strong acid solution of 1.
以」二の説明から明らかなように、本発明の熱延鋼板の
製造方法ｔま、酸洗脱スケール後の熱延鋼板を陽極とす
る電解処理を行うことにより、酸洗の際に鋼板面に生成
した腐食生成物の元金除去を１．ｌＪ能とするとともに
鋼板面を不動態化して化成処理四にすぐれだ熱延鋼板か
１（１・られるので、自動車用等塗装用の高張力薄肉熱
延鋼槻のｍ１ｊｊｋ性の向」−に顕著な効果を発揮する
。As is clear from the following explanation, the hot-rolled steel sheet manufacturing method of the present invention involves performing electrolytic treatment using the hot-rolled steel sheet after pickling and descaling as an anode, so that the surface of the steel sheet is improved during pickling. 1. Removal of the original metal from the corrosion products generated in 1. In addition to making the steel sheet surface passivated, it is possible to passivate the surface of the hot rolled steel sheet and make it superior to the chemical conversion treatment. It has a remarkable effect.
貢５１図は本発明方法を実施する熱延鋼板の製造ライン
の一例を示す模式図、第２図Ｑま本発明方法において設
けた陽イ礁処理ｉ・乃の一例をン」くｔ側面図である。
１：剖同１反、２：アシコイラー、２．リコイラー、３
：ウエルダー、４：フラノンユトリマ、５：プロセソ→
）−１６：酸洗＋１．１ｈ、７：水洗１．ｙ９．８：陽
極処理４．ｉ１ｇ、９：水洗イ・島 １０ニドライヤー
、１１：電解伶、■２：電屏液、１３：陰極、１４ニリ
ンカーロール、１５ニシンギングロール、１６：絞りロ
ール。
出 幀 人 住友金属工裟株戊会社Figure 51 is a schematic diagram showing an example of a production line for hot-rolled steel sheets in which the method of the present invention is carried out, and Figure 2 is a side view showing an example of the reef treatment provided in the method of the present invention. It is. 1: Anatomy 1 piece, 2: Ashikoiler, 2. Recoiler, 3
: Welder, 4: Furanone Utrima, 5: Processo →
)-16: Pickling + 1.1h, 7: Water washing 1. y9.8: Anodization 4. i1g, 9: washing with water, 10 dryer, 11: electrolytic liquid, 2: electrolyte, 13: cathode, 14 nilinker roll, 15 herringing roll, 16: squeezing roll. People Sumitomo Metal Industries, Ltd.
Claims (1)
前記型）うイによる熱延鋼板の溶解反応および酸素発生
反応によって熱延鋼板面上の腐食生成物を除去するとと
もに前記電解によシ熱延鋼板面に不動態皮膜を生成させ
、熱延鋼板の化成処理性を向上させることを特徴とする
化成処理性にすぐれだ熱延鋼板の製造方法。(1) Electrolyze a descaled hot rolled steel plate as an anode,
The corrosion products on the surface of the hot-rolled steel sheet are removed by the melting reaction and oxygen generation reaction of the hot-rolled steel sheet by the above-mentioned type), and a passive film is generated on the surface of the hot-rolled steel sheet by the electrolysis, thereby producing a hot-rolled steel sheet. 1. A method for producing a hot-rolled steel sheet with excellent chemical conversion treatment properties, characterized by improving chemical conversion treatment properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17285182A JPS5964783A (en) | 1982-09-30 | 1982-09-30 | Method for manufacturing hot-rolled steel sheets with excellent chemical conversion treatment properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17285182A JPS5964783A (en) | 1982-09-30 | 1982-09-30 | Method for manufacturing hot-rolled steel sheets with excellent chemical conversion treatment properties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5964783A true JPS5964783A (en) | 1984-04-12 |
Family
ID=15949474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17285182A Pending JPS5964783A (en) | 1982-09-30 | 1982-09-30 | Method for manufacturing hot-rolled steel sheets with excellent chemical conversion treatment properties |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5964783A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0254796A (en) * | 1988-08-17 | 1990-02-23 | Sanyo Electric Co Ltd | Improvement of corrosion resistance of stainless steel |
-
1982
- 1982-09-30 JP JP17285182A patent/JPS5964783A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0254796A (en) * | 1988-08-17 | 1990-02-23 | Sanyo Electric Co Ltd | Improvement of corrosion resistance of stainless steel |
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