JP2004169160A - Method for manufacturing galvannealed steel sheet superior in formability - Google Patents
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、高Ｓｉ系鋼板または高Ｐ系鋼板を基材とする外観およびめっき密着性と加工性に優れた合金化溶融亜鉛めっき鋼板の製造方法に関するものである。
【０００２】
【従来の技術】
近年、自動車の軽量化対策と腐食防止を目的として自動車の外板または内板用に高強度鋼板を下地とする合金化溶融亜鉛めっき鋼板を使用する需要が増大してきている。この高強度鋼板には、Ｓｉを０．２〜２．０％含有するか、または、Ｐが０．０３〜０．２％で含有されているため、被めっき鋼板表面に不均一な酸化膜や鋼中成分の不均一な濃化を有しやすく、従来の溶融亜鉛めっき法においては不めっきを生じたり、また、界面のバリア層が強化され合金化が十分進行しなかったり、めっき層中の合金層が局部的に異常発生するなどの問題があった。
【０００３】
上述したような問題を解消するために、例えば特開平４−３４６６４４号公報（特許文献１）で提案しているように、高張力鋼板の表面をサンドペーパーや研磨、ブラシ研磨、ショットブラスト、電解研磨などで表面層を除去した後、プレＮｉめっきをして溶融亜鉛の不めっきをなくし、めっき密着性をよくする方法や特開平４−３０４３４６号公報（特許文献２）で提案しているように、被めっき鋼板の表面を０．１〜５μｍ研削し、該鋼板を、Ｓｉ：０．００１〜０．２重量％、Ａｌ：０．０５〜０．２０質量％、残部Ｚｎおよび不可避的不純物からなる溶融亜鉛めっき浴を用いためっきを行ない、その後加熱合金化処理を行う方法、または、特開平１０−８１９４８号公報で提案しているように、被めっき鋼板の表面を１〜８ｇ／ｍ２ 研削除去した鋼板への合金化溶融亜鉛めっき鋼板の製造方法が開示されている。
【０００４】
【引用文献】
（１）特許文献１（特開平４−３４６６４４号公報）
（２）特許文献２（特開平４−３０４３４６号公報）
（３）特許文献３（特開平１０−８１９４８号公報）
【０００５】
【発明が解決しようとする課題】
上述した特許文献１はプレＮｉめっきを条件としている。また、特許文献２はめっき浴組成にＳｉ濃度の限定を加え、ＳｉとＡｌの役割としてＦｅ−Ｚｎ合金相の成長過程でＳｉ，Ａｌは少なくとも地鉄界面、δ１ 相およびその表面に濃化偏析し、このＳｉ，Ａｌ偏析帯がバリアーとなって合金相の生成形態の加工応力を分散させやすい入り乱れた構造とするため、合金化溶融亜鉛めっき鋼板の加工性が向上するというものである。さらに、特開平１０−８１９４８号公報（特許文献３）はＰを含む極低炭素鋼にＳｉを含有させ、かつめっき前に行う還元加熱後の冷却条件とめっき後の合金化処理条件とを管理することにより耐パウダリング性および耐チッピング性の向上を図るものである。しかし、これらはいずれも鋼板表面のＲａ値との関係から解明したものではない。
【０００６】
【課題を解決するための手段】
上述したように、従来の高Ｓｉ系鋼板または高Ｐ系鋼板へのめっき密着性と加工性の改善対策では表面を研削する点において共通しているが、しかしながら、その研削した表面の状態であるＲａ値とめっき密着性および加工性との関係を解明したものではない。本発明は研削後の表面状態を解明することにより、高Ｓｉ系鋼板または高Ｐ系鋼板へのめっき密着性と加工性に優れた合金化溶融亜鉛めっき鋼板の製造方法を提供するものである。その発明の要旨とするところは、
（１）鋼中Ｓｉ濃度０．２〜２．０％の合金化溶融亜鉛めっき鋼板の製造方法において、被めっき鋼板の表面を研削してＲａ：０．３〜０．６とし、該鋼板を、Ａｌ：０．０５〜０．２０質量％、残部Ｚｎおよび不可避的不純物からなる溶融亜鉛めっき浴に浸漬した後、加熱合金化処理を行うことを特徴とする加工性の優れた合金化溶融亜鉛めっき鋼板の製造方法。
【０００７】
（２）鋼中Ｐ濃度０．０３％以上の合金化溶融亜鉛めっき鋼板の製造方法において、被めっき鋼板の表面を研削してＲａ：０．３〜０．６とし、該鋼板を、Ａｌ：０．０５〜０．２０質量％、残部Ｚｎおよび不可避的不純物からなる溶融亜鉛めっき浴に浸漬した後、加熱合金化処理を行うことを特徴とする加工性の優れた合金化溶融亜鉛めっき鋼板の製造方法である。
【０００８】
【発明の実施の形態】
以下、本発明について詳細に説明する。
本発明において、鋼中Ｓｉ濃度０．２〜２．０％の鋼板の表面を研削してＲａ：０．３〜０．６とするのは、鋼中Ｓｉによる地鉄表面へのＳｉの拡散による濃縮および鋼板表面の酸化による鋼板表面のＳｉＯ２ を含む酸化被膜を除去することにより溶融亜鉛めっき時の濡れ性および合金化反応を改善することは勿論のこと合金化溶融亜鉛めっき鋼板の表面上に縦縞模様を生じて外観性を阻害するのを防止するためである。鋼中Ｓｉ濃度が０．２％未満では外観不良の問題は生じず、また、２．０％を超えると本発明法を適用しても十分な効果が得られない。従って、その範囲を０．２〜２．０％とした。
【０００９】
また、鋼板の表面をＲａ：０．３〜０．６としたのは、上記した溶融亜鉛めっき時の濡れ性および合金化反応を改善することは勿論のこと、特に合金化溶融亜鉛めっき鋼板の表面に縦縞模様を生じて外観性を阻害するのを防止するためで、０．３未満ではＲａ：０．３μｍと比較してそれ以上外観改善効果が得られずプロセスロールとのスリップ発生の問題があり、また、０．６を超えると合金化溶融亜鉛めっき鋼板の表面上に縦縞模様を生じて外観性を阻害することから、その範囲を０．３〜０．６とした。
【００１０】
また、鋼板の表面をＲａ：０．３〜０．６にするためには、鋼板の表面をサンドペーパー研磨、ブラシ研磨、ショットブラストなどの種々の方法で除去する。特にブラシ研磨を用いる場合は、例えばブラシ糸径：０．８〜１．６ｍｍ、ブラシ糸材質：ナイロン、金属等、ブラシ砥粒の番手：２４０番、１００番、８０番等を選択し、ブラシ回転数を６００〜１２００ｒｐｍの範囲で制御することにより行う。
【００１１】
さらに、鋼中Ｐについても、Ｓｉと同様に鋼板表面へのＰの拡散による濃縮および鋼板表面の酸化膜が発生しやすく、溶融亜鉛めっき性が悪くて合金化の進行が妨げられる。そのために、特に鋼中Ｐ濃度が０．０３％以上の高Ｐ含有鋼板についても、その表面を研磨し、所定のＲａ値にすることにより、溶融亜鉛めっき後、合金化処理後のめっき層の均一性および加工部の密着性の向上を図るものである。しかし、鋼中Ｐ濃度が０．０３％未満では外観不良の問題は生じないことから、その下限を０．０３％とした。
【００１２】
Ａｌ：０．０５〜０．２０質量％とした理由は、Ａｌが０．０５％未満であると、めっき界面に脆いＦｅ−Ｚｎ層が生成し、めっき密着性を損なう。また、０．２０％を超えるとＡｌによるＦｅ拡散抑制効果が強く、めっき層の合金化処理を完成するのに長時間を要するとともに外観が損なわれることから、その上限を０．２０％とした。このような溶融亜鉛めっき浴に浸漬した後、加熱合金化処理を行う。合金化処理時の加熱温度は、４４０〜６００℃の範囲で行う。４４０℃に満たない温度域の場合には合金化が不十分になり、また、６００℃を超える温度域では合金化が進みすぎ、Γ相が発生しやすくなり、めっき密着性が劣化する。また、合金化時間については、合金化温度とのバランスで決まるが、１０〜４０秒の範囲が最適である。１０秒未満では合金化が進みにくく、４０秒を超えると合金化が進みすぎ、Γ相が発生しやすくなり、めっき密着性が劣化する。
【００１３】
【実施例】
（実施例１）
以下、本発明について実施例によって具体的に説明する。
ゼンジマー式溶融亜鉛めっきラインにて、板厚１．２ｍｍで板幅９００ｍｍの鋼中Ｓｉ濃度０．４〜１．５％の鋼板をブラシ研磨にて鋼板表面を研磨し続いて加熱焼鈍した後、溶融亜鉛めっき浴に浸漬しガスワイピング方式にて所定の付着量にめっきし、直ちに加熱処理炉内に導き板温度４８０〜５５０℃、保持時間１５〜３０秒間の条件にて合金化溶融めっき鋼板を製造した。その際、前処理条件としての鋼板のＲａ値、用いた溶融亜鉛めっき浴の組成、および得られた合金化溶融めっき鋼板の外観および加工性評価結果を表１に示す。
【００１４】
（実施例２）
実施例１と同様の条件で、ゼンジマー式溶融亜鉛めっきラインにて、板厚１．２ｍｍで板幅９００ｍｍの鋼中Ｐ濃度０．０３５〜０．０９％の鋼板をブラシ研磨にて鋼板表面を研磨し続いて加熱焼鈍した後、溶融亜鉛めっき浴に浸漬しガスワイピング方式にて所定の付着量にめっきし、直ちに加熱処理炉内に導き板温度４８０〜５５０℃、保持時間１５〜２０秒間の条件にて合金化溶融めっき鋼板を製造した。その際、前処理条件としての鋼板のＲａ値、用いた溶融亜鉛めっき浴の組成、および得られた合金化溶融めっき鋼板の外観および加工性評価結果を表１に示す。
【００１５】
表面外観性（視覚による合金化溶融亜鉛めっき鋼板の表面外観）
○：縦縞模様な認められない
△：縦縞模様が少し認められる
×：縦縞模様が認めらる
加工性（６０度Ｖ曲げ、曲げ戻しテープ剥離テスト）
○：片側剥離幅５ｍｍ未満
△：片側剥離幅５ｍｍ以上８ｍｍ未満
×：片側剥離幅８ｍｍ以上
【００１６】
【表１】
表１に示すように、Ｎｏ．１〜１０は本発明例であり、Ｎｏ．１１〜１８は比較例である。Ｎｏ．１１〜１２は前処理条件としての鋼板への研磨によるＲａ値が０．７と高い（研削が十分でない）場合であり、縦縞模様が発生し外観性が悪い。同じく、Ｎｏ．１３は研磨するもＲａ値が０．７と高く、縦縞模様が少し認められ外観性に劣る。Ｎｏ．１４はＲａ値が１．０と高く、この場合は不めっきが生じた。Ｎｏ．１５は研磨するもＲａ値が０．８と高く、この場合は縦縞模様が少し認められ外観性に劣り、しかも加工性が悪い。同様に、Ｎｏ．１６は研磨するもＲａ値が０．８と高く、縦縞模様が認められ外観性が悪い。さらに、Ｎｏ．１７〜１８はＲａ値が１．０と高く、この場合は縦縞模様が発生し外観性が悪く、特にＮｏ．１７の場合は加工性が劣ることが判る。これに対し、本発明例であるＮｏ．１〜１０のいずれも縦縞模様のない外観性の優れた合金化溶融亜鉛めっき鋼板が得られ、かつめっき密着性のよい加工性に優れた合金化溶融亜鉛めっき鋼板が得られることが判る。
【００１８】
【発明の効果】
以上述べたように、本発明を用いることにより加工部のめっき密着性が従来になく優れ、かつ縦縞模様のない外観性の優れた合金化溶融亜鉛めっき鋼板が得られることから、その工業的意義は極めて大きいものである。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing an alloyed hot-dip galvanized steel sheet having a high Si-based steel sheet or a high P-based steel sheet as a base material and having excellent appearance, plating adhesion and workability.
[0002]
[Prior art]
BACKGROUND ART In recent years, there has been an increasing demand for using alloyed hot-dip galvanized steel sheets having high-strength steel sheets as bases for outer and inner plates of automobiles for the purpose of reducing the weight of automobiles and preventing corrosion. Since this high-strength steel sheet contains 0.2 to 2.0% of Si or 0.03 to 0.2% of P, an uneven oxide film is formed on the surface of the steel sheet to be plated. It tends to have non-uniform enrichment of components in steel and steel, causing non-plating in the conventional hot-dip galvanizing method, strengthening of the barrier layer at the interface and insufficient alloying, and However, there was a problem that the alloy layer of No. was locally abnormal.
[0003]
In order to solve the above-mentioned problem, for example, as proposed in Japanese Patent Application Laid-Open No. 4-346644 (Patent Document 1), the surface of a high-tensile steel plate is sandpapered or polished, brush polished, shot blasted, electrolytically polished. After removing the surface layer by polishing or the like, pre-Ni plating is performed to eliminate non-plating of molten zinc and improve plating adhesion, or as proposed in Japanese Patent Application Laid-Open No. 4-304346 (Patent Document 2). Then, the surface of the steel sheet to be plated is ground by 0.1 to 5 μm, and the steel sheet is subjected to Si: 0.001 to 0.2% by weight, Al: 0.05 to 0.20% by weight, balance Zn and unavoidable impurities. Plating using a hot-dip galvanizing bath consisting of: and then performing a heat alloying treatment, or, as proposed in JP-A-10-81948, the surface of the steel plate to be plated is 1 to 8 g / m2. 2 Method for manufacturing a galvannealed steel sheet to the cutting removed steel is disclosed.
[0004]
[References]
(1) Patent Document 1 (JP-A-4-346644)
(2) Patent Document 2 (Japanese Patent Laid-Open No. 4-304346)
(3) Patent Document 3 (JP-A-10-81948)
[0005]
[Problems to be solved by the invention]
The above-mentioned Patent Document 1 is based on pre-Ni plating. Patent Literature 2 further restricts the Si concentration to the plating bath composition, and plays a role of Si and Al in the growth process of the Fe—Zn alloy phase, where Si and Al are concentrated at least at the ferrous metal interface, the δ 1 phase and its surface. It segregates, and the Si, Al segregation zone acts as a barrier to form a disturbed structure that easily disperses the processing stress in the form of the alloy phase, so that the workability of the galvannealed steel sheet is improved. Furthermore, Japanese Patent Application Laid-Open No. Hei 10-81948 (Patent Literature 3) discloses that the ultra-low carbon steel containing P contains Si, and the cooling conditions after reduction heating performed before plating and the alloying treatment conditions after plating are controlled. By doing so, the powdering resistance and the chipping resistance are improved. However, none of these have been elucidated from the relationship with the Ra value of the steel sheet surface.
[0006]
[Means for Solving the Problems]
As described above, conventional measures for improving plating adhesion and workability to a high Si-based steel sheet or a high P-based steel sheet are common in that the surface is ground. However, this is the state of the ground surface. It does not elucidate the relationship between the Ra value and the plating adhesion and workability. The present invention provides a method for producing an alloyed hot-dip galvanized steel sheet having excellent plating adhesion and workability to a high Si-based steel sheet or a high P-based steel sheet by elucidating a surface state after grinding. The gist of the invention is that
(1) In a method for producing a galvannealed steel sheet having a Si concentration of 0.2 to 2.0% in steel, the surface of a steel sheet to be plated is ground to Ra: 0.3 to 0.6, , Al: 0.05 to 0.20% by mass, immersed in a hot-dip galvanizing bath containing the balance of Zn and unavoidable impurities, and then heat-alloying the alloyed hot-dip zinc alloy. Manufacturing method of plated steel sheet.
[0007]
(2) In the method for producing an alloyed hot-dip galvanized steel sheet having a P concentration of 0.03% or more in steel, the surface of the steel sheet to be plated is ground to Ra: 0.3 to 0.6, and the steel sheet is made of Al: A hot-dip galvanized steel sheet having excellent workability, characterized by performing a heat alloying treatment after immersion in a hot-dip galvanizing bath containing 0.05 to 0.20 mass%, with the balance being Zn and unavoidable impurities. It is a manufacturing method.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail.
In the present invention, the reason for grinding the surface of a steel sheet having a Si concentration of 0.2 to 2.0% in steel to Ra: 0.3 to 0.6 is that Si in the steel diffuses into the surface of the ground iron. Not only to improve the wettability and the alloying reaction during hot-dip galvanizing, but also to remove the oxide film containing SiO 2 on the steel sheet surface by the concentration and oxidation of the steel sheet surface. This is to prevent a vertical stripe pattern from being generated and hindering the appearance. If the Si concentration in the steel is less than 0.2%, the problem of poor appearance does not occur. Therefore, the range is set to 0.2 to 2.0%.
[0009]
The reason for setting the surface of the steel sheet to Ra: 0.3 to 0.6 is, of course, to improve the wettability and the alloying reaction during the hot-dip galvanizing described above, and in particular, to improve the galvannealed steel sheet. This is to prevent vertical stripes from forming on the surface and hindering the appearance. If it is less than 0.3, the effect of improving the appearance cannot be obtained any more as compared with Ra: 0.3 μm, and there is a problem of occurrence of slip with the process roll. Further, if it exceeds 0.6, a vertical stripe pattern is formed on the surface of the galvannealed steel sheet and the appearance is impaired, so that the range was set to 0.3 to 0.6.
[0010]
Further, in order to make the surface of the steel sheet Ra: 0.3 to 0.6, the surface of the steel sheet is removed by various methods such as sandpaper polishing, brush polishing, shot blasting and the like. In particular, when brush polishing is used, for example, brush thread diameter: 0.8 to 1.6 mm, brush thread material: nylon, metal, etc., brush abrasive grain count: 240, 100, 80, etc. This is performed by controlling the number of revolutions in the range of 600 to 1200 rpm.
[0011]
Further, also in P in steel, as in the case of Si, concentration due to diffusion of P to the surface of the steel sheet and the formation of an oxide film on the steel sheet surface are liable to occur, and the hot-dip galvanizing property is poor, thereby preventing the progress of alloying. For this reason, the surface of even a high-P content steel sheet having a P content of 0.03% or more is polished to a predetermined Ra value, so that the hot-dip galvanizing and the plating layer after the alloying treatment are formed. The purpose is to improve uniformity and adhesion of the processed portion. However, if the P concentration in steel is less than 0.03%, the problem of poor appearance does not occur, so the lower limit is set to 0.03%.
[0012]
The reason for setting Al: 0.05 to 0.20 mass% is that if the Al content is less than 0.05%, a brittle Fe-Zn layer is generated at the plating interface, and the plating adhesion is impaired. On the other hand, if the content exceeds 0.20%, the effect of suppressing the diffusion of Fe by Al is strong, and it takes a long time to complete the alloying treatment of the plating layer and the appearance is impaired. Therefore, the upper limit is set to 0.20%. . After immersion in such a hot-dip galvanizing bath, a heat alloying treatment is performed. The heating temperature during the alloying treatment is in the range of 440 to 600 ° C. In a temperature range lower than 440 ° C., alloying becomes insufficient, and in a temperature range higher than 600 ° C., alloying proceeds excessively, a Γ phase is easily generated, and plating adhesion deteriorates. Further, the alloying time is determined by the balance with the alloying temperature, but is optimally in the range of 10 to 40 seconds. If the time is less than 10 seconds, the alloying is difficult to proceed.
[0013]
【Example】
(Example 1)
Hereinafter, the present invention will be described specifically with reference to Examples.
In a Sendzimer hot-dip galvanizing line, a steel sheet having a thickness of 1.2 mm and a sheet width of 900 mm and having a Si concentration of 0.4 to 1.5% in steel is polished with a brush and the surface is subsequently annealed by heating. It is immersed in a hot-dip galvanizing bath, plated to a predetermined amount by gas wiping method, immediately introduced into a heat treatment furnace, and subjected to a plate temperature of 480 to 550 ° C and a holding time of 15 to 30 seconds to form a galvannealed steel sheet. Manufactured. Table 1 shows the Ra value of the steel sheet, the composition of the hot-dip galvanizing bath used, and the appearance and workability evaluation results of the obtained galvannealed steel sheet as pretreatment conditions.
[0014]
(Example 2)
Under the same conditions as in Example 1, a steel plate having a P thickness of 0.035 to 0.09% in steel having a thickness of 1.2 mm and a width of 900 mm was brush-polished in a Sendzimer hot-dip galvanizing line to brush the steel plate surface. After polishing and subsequent heat annealing, immersion in a hot-dip galvanizing bath and plating to a predetermined adhesion amount by gas wiping method, immediately introduced into a heat treatment furnace, plate temperature of 480 to 550 ° C, holding time of 15 to 20 seconds Under the conditions, an alloyed hot-dip coated steel sheet was manufactured. Table 1 shows the Ra value of the steel sheet, the composition of the hot-dip galvanizing bath used, and the appearance and workability evaluation results of the obtained galvannealed steel sheet as pretreatment conditions.
[0015]
Surface appearance (visual appearance of galvannealed steel sheet)
：: No vertical stripe pattern is recognized. 縦: Vertical stripe pattern is slightly recognized. X: Workability with vertical stripe pattern recognized (60 ° V bending, bending-back tape peeling test).
：: One-side peel width of less than 5 mm △: One-side peel width of 5 mm or more and less than 8 mm ×: One-side peel width of 8 mm or more
[Table 1]
As shown in Table 1, Nos. 1 to 10 are examples of the present invention. 11 to 18 are comparative examples. No. Nos. 11 to 12 are cases where the Ra value of the steel sheet as a pretreatment condition is as high as 0.7 (grinding is not sufficient), and vertical stripes are generated and the appearance is poor. Similarly, no. Although No. 13 was polished, the Ra value was as high as 0.7, a little vertical stripe pattern was observed, and the appearance was poor. No. In No. 14, the Ra value was as high as 1.0, and in this case, non-plating occurred. No. Although No. 15 was polished, the Ra value was as high as 0.8. In this case, a slight vertical stripe pattern was observed, the appearance was poor, and the workability was poor. Similarly, no. Although No. 16 was polished, the Ra value was as high as 0.8, vertical stripes were observed, and the appearance was poor. In addition, No. Nos. 17 to 18 have Ra values as high as 1.0, and in this case, vertical stripes are generated and appearance is poor. In the case of No. 17, the workability is inferior. On the other hand, No. 1 of the present invention example It can be seen that in any of 1 to 10, an alloyed hot-dip galvanized steel sheet excellent in appearance without vertical stripes and excellent in workability with good plating adhesion is obtained.
[0018]
【The invention's effect】
As described above, by using the present invention, an alloyed hot-dip galvanized steel sheet having an excellent plating adhesion of a processed portion, which is superior to conventional ones, and an excellent appearance without vertical stripes can be obtained. Is extremely large.
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| JP2002339113A JP3735339B2 (en) | 2002-11-22 | 2002-11-22 | Method for producing alloyed hot-dip galvanized steel sheet with excellent workability |
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| JP2002339113A JP3735339B2 (en) | 2002-11-22 | 2002-11-22 | Method for producing alloyed hot-dip galvanized steel sheet with excellent workability |
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| WO2010089910A1 (en) | 2009-02-03 | 2010-08-12 | 新日本製鐵株式会社 | Galvannealed steel sheet and process for production thereof |
| KR20150060816A (en) | 2012-10-03 | 2015-06-03 | 신닛테츠스미킨 카부시키카이샤 | Alloyed hot-dip zinc-coated steel sheet and method for producing same |
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