JP2002180224A - Galvannealed steel sheet and its production method - Google Patents
Galvannealed steel sheet and its production methodInfo
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- JP2002180224A JP2002180224A JP2000376225A JP2000376225A JP2002180224A JP 2002180224 A JP2002180224 A JP 2002180224A JP 2000376225 A JP2000376225 A JP 2000376225A JP 2000376225 A JP2000376225 A JP 2000376225A JP 2002180224 A JP2002180224 A JP 2002180224A
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- base material
- steel sheet
- plating
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車、家電製
品、建材などの材料として好適な、加工後のめっき皮膜
の密着性が優れた合金化溶融亜鉛めっき鋼板とその製造
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alloyed hot-dip galvanized steel sheet which is suitable as a material for automobiles, home appliances, building materials and the like and has excellent adhesion of a plated film after processing, and a method for producing the same.
【０００２】[0002]
【従来の技術】近年、家電、建材、及び自動車の産業分
野においては溶融亜鉛めっき鋼板が大量に使用されてい
るが、とりわけ経済性、防錆機能、塗装後の性能の点で
合金化溶融亜鉛めっき鋼板が広く用いられている。2. Description of the Related Art In recent years, galvanized steel sheets have been used in large quantities in the fields of home appliances, building materials, and automobiles, but especially in terms of economic efficiency, rust prevention function, and performance after painting. Plated steel sheets are widely used.
【０００３】溶融亜鉛めっき鋼板は通常、適当な脱脂洗
浄工程を経た後、もしくは脱脂洗浄を行うことなく、非
還元性雰囲気または還元性雰囲気で予熱した後、水素＋
窒素の還元性雰囲気で鋼板を焼鈍し、しかる後、鋼板を
めっき温度付近まで冷却し溶融亜鉛に浸漬することによ
り製造される。[0003] A hot-dip galvanized steel sheet is usually treated with hydrogen + after a suitable degreasing and washing step, or after preheating in a non-reducing or reducing atmosphere without degreasing.
It is manufactured by annealing a steel sheet in a reducing atmosphere of nitrogen, then cooling the steel sheet to around a plating temperature and immersing it in molten zinc.
【０００４】合金化溶融亜鉛めっき鋼板は、通常、連続
的に溶融亜鉛めっきした鋼板を熱処理炉で５００〜６０
０℃の材料温度に３〜６０秒加熱して製造される。その
めっき皮膜はＦe-Ｚn の金属間化合物よりなり、平均Ｆ
e 含有量は一般に質量％で（以下、化学組成を表す％表
示は質量％を意味する）８〜１２％である。めっきの付
着量は通常片面当り２０〜７０g/m2である。[0004] The galvannealed steel sheet is usually prepared by subjecting a continuously galvanized steel sheet to a heat treatment furnace of 500 to 60%.
It is manufactured by heating to a material temperature of 0 ° C. for 3 to 60 seconds. The plating film is made of an Fe-Zn intermetallic compound and has an average F
The e content is generally from 8 to 12% by mass (hereinafter, the% expression representing the chemical composition means mass%). The amount of plating is usually 20 to 70 g / m 2 per one side.
【０００５】めっき皮膜をＦe-Ｚn 合金とすることによ
り、めっき皮膜の抵抗溶接性や塗膜の密着性を向上させ
ることができるので、特に自動車車体外板などに好適な
材料として使用されている。しかしながら合金化に伴
い、プレス加工などに際してめっき皮膜が粉末状に剥離
する現象、いわゆるパウダリング不良が生じやすくな
る。[0005] By using a Fe-Zn alloy for the plating film, the resistance welding property of the plating film and the adhesion of the coating film can be improved. . However, with alloying, a phenomenon in which a plating film peels in a powder state during press working or the like, that is, a so-called powdering defect easily occurs.
【０００６】パウダリングは、鋼板が圧縮変形を受けた
場合に、めっき皮膜が粉状になって剥離する現象であ
り、パウダリングが生じた部分は耐食性が劣化し、発生
したＺn 粉末が金型に付着して成形品の外観品質を損な
う。パウダリングはＦe-Ｚn 合金化が進行し、Г相等の
硬質な合金相が過剰に生じると顕著になるといわれてい
るまた、塗装した合金化溶融亜鉛めっき鋼板に、低温で
石跳ね等による衝撃が作用するとめっき皮膜が剥離す
る、いわゆる低温チッピングなどの不良も生じる場合が
ある。これは塗膜に衝撃力が加えられた際に、めっき皮
膜が母材界面から剥離する現象であり、剥離部分では製
品外観とともに発錆などの問題も生じる。このため、加
工時には耐パウダリング性が優れ、塗装後には耐低温チ
ッピング性が優れた合金化溶融亜鉛めっき鋼板が求めら
れている。[0006] Powdering is a phenomenon in which, when a steel sheet is subjected to compression deformation, a plating film becomes powdery and peels off. Corrosion resistance is deteriorated in the portion where powdering occurs, and the generated Zn powder is used in a mold. On the surface of the molded product. It is said that powdering becomes remarkable when Fe-Zn alloying progresses and a hard alloy phase such as the 過 剰 phase is excessively produced. When acting, defects such as so-called low-temperature chipping, in which the plating film peels off, may also occur. This is a phenomenon in which the plating film peels off from the interface of the base material when an impact force is applied to the coating film, and in the peeled portion, there arises a problem such as rusting together with the product appearance. Therefore, there is a demand for an alloyed hot-dip galvanized steel sheet having excellent powdering resistance during processing and excellent low-temperature chipping resistance after painting.
【０００７】特開平１−１３６９５２号公報には、めっ
き皮膜と母材との界面に存在するΓ相などの硬い合金相
の厚さを１．３μm 以下に制限することで耐パウダリン
グ性を改善しようとする合金化溶融Ｚn めっき鋼板が提
案されている。また特開平７−３４２１３号公報には、
めっき浴のＡl 含有量を高くし、かつ、合金化時に高速
昇温加熱する方法とを併用することにより、耐低温チッ
ピング性に優れた合金化溶融亜鉛めっき鋼板とその製造
方法が提案されている。[0007] Japanese Patent Application Laid-Open No. 1-136952 discloses an improvement in powdering resistance by limiting the thickness of a hard alloy phase such as a Γ phase existing at the interface between a plating film and a base material to 1.3 μm or less. An alloyed hot-dip galvanized steel sheet has been proposed. Also, JP-A-7-34213 discloses
An alloyed hot-dip galvanized steel sheet having excellent low-temperature chipping resistance and a method for producing the same have been proposed by using a method of increasing the Al content of a plating bath and simultaneously heating and heating at a high temperature during alloying. .
【０００８】特開昭６２−１３９８６０号公報には母材
表面をＰで被覆する方法が、特開平７−２５２６２３号
公報にはＳi またはＭn で被覆する方法が提案されてい
る。Japanese Patent Application Laid-Open No. 62-139860 proposes a method of coating the surface of a base material with P, and Japanese Patent Application Laid-Open No. Hei 7-252623 proposes a method of coating with Si or Mn.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら特開平１
−１３６９５２号公報あるいは特開平７−３４２１３号
公報に提案された方法は、めっき皮膜の密着性を根本的
に改善したものはなく、その効果は十分でない場合があ
る。また、特開昭６２−１３９８６０号公報、特開平７
−２５２６２３号公報で提案された方法でも被覆金属や
被覆条件によっては密着性の向上効果が認められない場
合があるうえ、めっき後の合金化処理性を損なう（合金
化を著しく遅延させる）傾向もあるため、十分な方法と
はいえない。SUMMARY OF THE INVENTION However, Japanese Patent Laid-Open No.
The methods proposed in JP-B-136952 or JP-A-7-34213 do not fundamentally improve the adhesion of the plating film, and their effects may not be sufficient. Also, JP-A-62-139860 and JP-A-7-139860
According to the method proposed in JP-A-252623, the effect of improving the adhesion may not be recognized depending on the coating metal or coating conditions, and the alloying processability after plating may be impaired (alloying is significantly delayed). This is not a sufficient method.
【００１０】本発明の目的は、上記のような溶融めっき
鋼板のめっき皮膜の母材との密着性を改善し、厳しい成
形に耐えうる優れた密着性を有する合金化溶融亜鉛めっ
き鋼板およびその製造方法を提供することにある。An object of the present invention is to improve the adhesion of a plating film of a hot-dip coated steel sheet to a base material as described above, and to provide an alloyed hot-dip galvanized steel sheet having excellent adhesion that can withstand severe forming. It is to provide a method.
【００１１】[0011]
【課題を解決するための手段】本発明者らは、溶融Ｚn
系めっき鋼板におけるめっき皮膜の密着性と母材表面近
傍の結晶学的形態との関係について、高分解能透過型電
子顕微鏡を用いて詳細な研究を重ねた。その結果、母材
の表面近傍に、体心立方(bcc) 格子を基礎とし、主にＦ
e とＡl 原子によって構成される規則構造を呈する層
（置換型規則固溶体。以下、単に「規則構造層」とも記
す）が存在すると、その上のめっき皮膜との間で優れた
密着性が発揮されることを知った。Means for Solving the Problems The present inventors have proposed molten Zn
Detailed studies were made on the relationship between the adhesion of the plating film and the crystallographic morphology near the surface of the base material in the system-coated steel sheets using a high-resolution transmission electron microscope. As a result, a body-centered cubic (bcc) lattice was used near the surface of the
If there is a layer having a regular structure composed of e and Al atoms (substitution type ordered solid solution; hereinafter, also simply referred to as “regular structure layer”), excellent adhesion to the plating film thereon is exhibited. I knew that.
【００１２】この規則構造は、αＦe の結晶構造である
体心立方格子の体心位置にＡl 原子が置換して固溶し
た、いわゆるＢ2 規則格子を形成している場合が多い。
このような規則構造は、Ｘ線あるいは電子回折パターン
における規則格子反射の解析により決定される。高分解
能電子顕微鏡により原子配列を直接観察することでも確
認可能である。This ordered structure often forms a so-called B 2 ordered lattice in which Al atoms are substituted at the body center position of the body-centered cubic lattice, which is a crystal structure of αFe, to form a solid solution.
Such a regular structure is determined by analyzing regular lattice reflection in an X-ray or electron diffraction pattern. It can also be confirmed by directly observing the atomic arrangement with a high-resolution electron microscope.
【００１３】規則固溶体の規則的に配列した原子は、温
度の上昇と共にランダムに配列するようになり、規則−
不規則変態を起こすといわれている。金属間化合物は、
溶融するまで規則配列を保っている。この点で金属間化
合物と規則固溶体とは区別されている。溶融めっき鋼材
において母材のめっき界面に上記の規則構造が存在する
ことは、従来、認められていなかったものである。The regularly arranged atoms of the ordered solid solution come to be randomly arranged as the temperature increases, and
It is said to cause irregular metamorphosis. The intermetallic compound is
It maintains a regular arrangement until it melts. In this respect, an intermetallic compound is distinguished from an ordered solid solution. The existence of the above-mentioned ordered structure at the plating interface of the base material in the hot-dip coated steel material has not heretofore been recognized.
【００１４】このような規則構造を持つ層が鋼板表面に
存在する場合にめっき皮膜間の密着性が向上する理由に
ついては明確ではないが、めっき皮膜形成の際に生成す
るＦe-Ａl 金属間化合物やＦe-Ｚn 金属間化合物、もし
くはめっき自体と鋼板との整合性や親和力が向上するた
めであろう、と推測される。The reason why the adhesion between the plating films is improved when the layer having such an ordered structure is present on the steel sheet surface is not clear, but the Fe-Al intermetallic compound formed when the plating film is formed is not clear. It is presumed that this is because the consistency and affinity between the steel sheet and the Fe-Zn intermetallic compound or the plating itself and the steel sheet are improved.
【００１５】さらに研究を進めた結果、合金化時の昇温
速度を制御することにより、規則相の形成が生じること
を知った。めっき皮膜の密着性を確保するには、めっき
浴浸漬時に規則構造層を発生させ、さらに、その後の工
程で規則構造のランダム配列化（不規則化）が生じない
ようにする必要がある。As a result of further study, it was found that the formation of an ordered phase occurs by controlling the rate of temperature rise during alloying. In order to ensure the adhesion of the plating film, it is necessary to generate a regular structure layer at the time of immersion in a plating bath, and further to prevent the random arrangement (irregularity) of the regular structure from occurring in the subsequent steps.
【００１６】母材表面での規則構造層は、めっき浴に含
有されるＡl 、Ｚn などの元素が母材内に拡散し、母材
を構成するＦe 原子と置換することにより生じるものと
考えられる。従って溶融めっき時に規則構造層を発生さ
せるには、溶融めっき浴のＡl 濃度、めっき浴温度など
を適正に管理する必要がある。It is considered that the ordered structure layer on the surface of the base material is generated by diffusion of elements such as Al and Zn contained in the plating bath into the base material and replacing Fe atoms constituting the base material. . Therefore, in order to generate an ordered structure layer during hot-dip plating, it is necessary to properly control the Al concentration in the hot-dip plating bath, the plating bath temperature, and the like.
【００１７】規則構造層を発生させるＡl 源としては、
めっき浴に含有させたＡl を利用する方法に加えて、例
えば、合金めっきや溶融塩めっきなどの化学的な被覆
法、あるいは、蒸着法、イオンプレーティング法、イオ
ン注入法など物理的な被覆法などにより、体心立方格子
を備えた母材の表面にＡl を被覆し、加熱することによ
り母材中にＡl 原子を拡散させる方法や、母材が含有す
るＡl を表面に拡散させて偏析させる方法でも構わな
い。Al sources for generating the ordered structure layer include:
In addition to the method using Al contained in the plating bath, for example, a chemical coating method such as alloy plating or molten salt plating, or a physical coating method such as a vapor deposition method, an ion plating method, or an ion implantation method. For example, Al is coated on the surface of a base material provided with a body-centered cubic lattice, and Al atoms are diffused into the base material by heating, or Al contained in the base material is diffused to the surface and segregated. It does not matter how.
【００１８】規則構造層の不規則化は高温で進行する。
従って、めっき浴温度を過度に高くした場合、めっき浴
への浸漬時間を過度に長くした場合、めっき後の冷却速
度が遅く、高温域で長時間保持された場合などにおいて
不規則化が加速される。さらに、溶融めっき後合金化処
理する場合には、合金化温度への昇温速度を過度に大き
くした場合、あるいは母材に過大な張力を作用させた場
合などにおいても不規則化が加速される。また、これら
の要因は相互に関連して不規則化に影響する。The disordering of the ordered structure layer proceeds at a high temperature.
Therefore, when the plating bath temperature is excessively high, when the immersion time in the plating bath is excessively long, the cooling rate after plating is low, and irregularity is accelerated when the plating bath is held for a long time in a high temperature region. You. Furthermore, when performing the alloying treatment after hot-dip plating, the disordering is accelerated even when the rate of raising the temperature to the alloying temperature is excessively increased, or when an excessive tension is applied to the base material. . These factors also interact with each other to influence the irregularity.
【００１９】合金化温度への昇温速度が不規則化を加速
する理由は以下のように推測される。合金化温度への昇
温速度を過度に大きくすると、母材と溶融Ｚn が直接反
応するようになる。このような場合にはＺn の母材側へ
の拡散が速いため、規則構造層にＺn が短時間で拡散
し、Ｆe 、Ａl 、Ｚn で構成される不規則固溶体を生成
し、規則構造層の破壊（不規則化）が進行する。The reason why the rate of raising the temperature to the alloying temperature accelerates the irregularization is presumed as follows. If the rate of raising the temperature to the alloying temperature is excessively increased, the base material and the molten Zn directly react. In such a case, since Zn diffuses rapidly into the base material side, Zn diffuses into the ordered structure layer in a short time to form an irregular solid solution composed of Fe, Al, and Zn, and Destruction (irregularization) proceeds.
【００２０】昇温速度を遅くするとＦe-Ｚn 金属間化合
物などが比較的低温で生成して母材表面を覆い尽くすの
で、Ｚn が溶融状態になるまで温度が上昇しても、規則
構造層と溶融Ｚn が直接に接することがない、と考えら
れる。このため、前記昇温速度を過度に大きくした場合
に比較して、規則構造層へのＺn の拡散が小さく、不規
則化が進行しにくいものと推定される。If the heating rate is reduced, Fe-Zn intermetallic compounds and the like are formed at a relatively low temperature and cover the surface of the base material. It is considered that the molten Zn does not come into direct contact. For this reason, it is presumed that the diffusion of Zn into the ordered structure layer is small and the disordering does not easily proceed as compared with the case where the heating rate is excessively increased.
【００２１】また、溶融めっき後合金化処理する場合に
は、合金化処理する母材に作用する張力（Ｓt 、ＭＰ
ａ）は、少なくとも２０MPa 以下、かつ、めっき浴温度
（Ｔp、℃）との関係において、下記式を満足する範囲
に制限するのがよい。Ｓt ≦｛２８０．５５−０．３５
（Ｔp ＋２７３）｝この張力は、例えば連続式めっき設
備を用いてめっき鋼板を製造する場合には、めっき鋼板
がめっき後合金化処理を終えて４００℃以下に冷却され
るまでの間の張力である。張力が高い場合に不規則化が
進行するのは、高温状態の母材に作用する張力がＺn の
母材への拡散速度に影響し、不規則化の進行が早まるた
め、と推定される。When the alloying process is performed after hot-dip plating, the tension (St, MP) acting on the base material to be alloyed is set.
a) is preferably limited to a range that satisfies the following formula at least in relation to the plating bath temperature (Tp, ° C.) at 20 MPa or less. St ≦ ｛280.55-0.35
(Tp + 273)｝ For example, in the case of manufacturing a plated steel sheet using a continuous plating equipment, the tension is a tension from the time when the coated steel sheet is subjected to alloying treatment after plating and cooled to 400 ° C. or less. is there. It is presumed that the irregularity proceeds when the tension is high because the tension acting on the base material in a high temperature state affects the diffusion rate of Zn into the base material and the progress of the disordering is accelerated.
【００２２】以上のことを考慮し、めっき浴のＡｌ濃
度、めっき浴温度、合金化時の昇温速度および母材に作
用する張力などを制御することにより、母材と皮膜との
界面の母材側に規則構造層を生成することが可能とな
り、規則構造層を有する合金化溶融亜鉛めっき鋼板を製
造することが可能となった。In consideration of the above, by controlling the Al concentration of the plating bath, the plating bath temperature, the rate of temperature rise during alloying, the tension acting on the base material, and the like, the base material at the interface between the base material and the film is controlled. An ordered structure layer can be generated on the material side, and an alloyed hot-dip galvanized steel sheet having an ordered structure layer can be manufactured.
【００２３】本発明はこれらの知見を基にして完成され
たものであり、その要旨は下記（１）、（２）記載の合
金化溶融亜鉛めっき鋼板および（３）、（４）記載のそ
の製造方法にある。The present invention has been completed on the basis of these findings, and the gist of the present invention is to provide an alloyed hot-dip galvanized steel sheet described in (1) and (2) below and a galvannealed steel sheet described in (3) and (4) below. In the manufacturing method.
【００２４】（１）母材表面に、質量％でＡl を０．０
５％以上、０．２０％以下、Ｆe を８％以上、１５％以
下含有し、残部が実質的にＺn よりなる合金化溶融亜鉛
めっき皮膜を備えた溶融めっき鋼板であって、めっき皮
膜と母材との界面領域に、体心立方格子を基礎とし、主
としてＦe 原子とＡl 原子とによって構成される規則構
造を呈する層を備えたものであることを特徴とする合金
化溶融亜鉛めっき鋼板。(1) Al is added to the surface of the base material by 0.0% by mass.
A hot-dip galvanized steel sheet comprising an alloyed hot-dip galvanized film containing 5% or more and 0.20% or less, Fe 8% or more and 15% or less, and the balance being substantially Zn. An alloyed hot-dip galvanized steel sheet comprising a layer having a regular structure mainly composed of Fe atoms and Al atoms based on a body-centered cubic lattice in an interface region with a material.
【００２５】（２）規則構造を呈する層の存在比率が、
面積率で母材表面の１０％以上であることを特徴とする
上記（１）に記載の合金化溶融亜鉛めっき鋼板。 （３）少なくとも表面にフェライト相を有する母材を、
質量％でＡl を０．０５％以上、０．２０％以下含有
し、残部が実質的にＺn からなる、４２０℃以上、５０
０℃以下の溶融めっき浴に、０．１秒以上、５秒以下浸
漬してめっきし、付着量を調整し、次いで、母材に作用
する張力（Ｓt 、単位：MPa ）を、２０MPa 以下、か
つ、Ｔp をめっき浴の温度（℃）として、Ｓt ≦｛２８
０．５５−０．３５（Ｔp ＋２７３）｝を満足する範囲
とし、５℃／秒以上、２００℃／秒以下の加熱速度で合
金化処理温度に加熱して合金化処理を施すことを特徴と
する上記（１）または（２）に記載の合金化溶融亜鉛め
っき鋼板の製造方法。(2) The existence ratio of the layer having a regular structure is
The galvannealed steel sheet according to the above (1), wherein the area ratio is 10% or more of the surface of the base material. (3) a base material having at least a ferrite phase on its surface,
Al content of 0.05% or more and 0.20% or less by mass%, the balance being substantially composed of Zn.
It is immersed in a hot-dip plating bath at 0 ° C. or less for 0.1 second or more and 5 seconds or less to perform plating, adjust the amount of adhesion, and then apply a tension (St, unit: MPa) acting on the base material to 20 MPa or less, Further, when Tp is the plating bath temperature (° C.), St ≦ ｛28
0.55 to 0.35 (Tp + 273)}, wherein the alloying treatment is performed by heating to an alloying treatment temperature at a heating rate of 5 ° C./sec or more and 200 ° C./sec or less. The method for producing a galvannealed steel sheet according to (1) or (2) above.
【００２６】（４）少なくとも表面にフェライト相を有
する母材の被めっき面にＡl を被覆した後、前記溶融め
っき浴に浸漬して溶融めっきを施すことを特徴とする上
記（３）に記載の合金化溶融亜鉛めっき鋼板の製造方
法。(4) The surface of the base material having at least a ferrite phase on at least the surface to be plated is coated with Al, and then dipped in the hot dipping bath to perform hot dipping. Manufacturing method of galvannealed steel sheet.
【００２７】[0027]
【発明の実施の形態】以下に本発明の実施の形態を詳細
に説明する。 母材：母材とめっき皮膜との界面に規則構造層を介在さ
せるために、境界領域、つまり、めっき皮膜下の母材表
層部に規則構造層を設ける。そのためには母材は少なく
ともその表面にフェライト相を有する鋼であればよく、
例えば、極低Ｃ鋼、低Ｃ鋼などの絞り加工用軟鋼、ある
いは各種の高張力鋼などを用いることができる。フェラ
イト相とオーステナイト相を有する残留オーステナイト
鋼、フェライト相とベーナイト相、あるいはフェライト
相とマルテンサイト相などからなる複合組織鋼などでも
構わない。フェライト相の比率は面積％で１０％以上で
あるのが望ましい。母材は冷間圧延鋼板、熱間圧延鋼板
いずれでも構わない。Embodiments of the present invention will be described below in detail. Base material: In order to interpose the ordered structure layer at the interface between the base material and the plating film, the ordered structure layer is provided in the boundary region, that is, in the surface layer portion of the base material below the plating film. For that purpose, the base material only needs to be a steel having a ferrite phase on at least its surface,
For example, mild steel for drawing such as extremely low C steel and low C steel, or various high tensile steels can be used. A retained austenitic steel having a ferrite phase and an austenite phase, a composite structure steel including a ferrite phase and a bainite phase, or a ferrite phase and a martensite phase may be used. It is desirable that the ratio of the ferrite phase is 10% or more in area%. The base material may be either a cold rolled steel plate or a hot rolled steel plate.
【００２８】母材の規則構造層：めっき鋼板のめっき皮
膜下の母材表層部、つまり境界領域には、主としてＦe
原子とＡl 原子により構成される規則構造層が存在して
いるものとする。主として、との意味は、規則構造層の
組成は主にＦe 原子とＡl 原子であるが、Ａl の他に、
添加元素あるいは不純物としてのＺn 、Ｓi 、Ｐなどが
少量混入しているものであっても構わないことを意味す
る。Regular structure layer of the base material: Fe is mainly provided on the surface layer of the base material under the plating film of the plated steel sheet, that is, in the boundary region.
It is assumed that a regular structure layer composed of atoms and Al atoms exists. The meaning of mainly means that the composition of the ordered structure layer is mainly Fe atoms and Al atoms, but in addition to Al,
This means that a small amount of Zn, Si, P or the like as an additive element or impurity may be mixed.
【００２９】本発明の規則構造層は、透過電子顕微鏡を
用いてめっき鋼板を断面方向から観察し、母材表層部か
ら得られた電子回折図形を解析することで確認できる。
例えば、母材が体心立方構造を示す鋼表面に本発明の規
則構造を持つ層が存在する場合、母材の<110> 方向から
の電子回折図形には[110] 、[200] 、[112] などの結晶
面からの回折斑点が見られるが、母材表面付近からの電
子回折図形にはこれらに加えて[100] 面からの回折斑点
を確認することができ、規則構造を呈していることを確
認できる。The ordered structure layer of the present invention can be confirmed by observing the plated steel sheet from the cross-sectional direction using a transmission electron microscope and analyzing the electron diffraction pattern obtained from the surface layer portion of the base material.
For example, when a layer having the ordered structure of the present invention is present on a steel surface where the base material shows a body-centered cubic structure, electron diffraction patterns from the <110> direction of the base material include [110], [200], [ Diffraction spots from crystal planes such as [112] can be seen, but diffraction spots from the [100] plane can be confirmed in addition to these in the electron diffraction pattern near the base metal surface. Can be confirmed.
【００３０】規則構造層が存在すればめっき皮膜の密着
性が向上するが、より優れた密着性を得るには、母材表
面に対する規則構造層の被覆率が、めっき皮膜を備えた
母材表面に対する面積率で（以下、規則構造層を表す％
表示は上記面積率を意味する）１０％以上であるのが望
ましい。より望ましくは５０％以上、さらに望ましくは
８０％以上である。The presence of the ordered structure layer improves the adhesion of the plating film, but in order to obtain better adhesion, the coverage of the ordered structure layer on the surface of the base material must be reduced (Hereinafter,% representing the ordered structure layer)
(The indication means the above-mentioned area ratio). More preferably, it is 50% or more, further preferably 80% or more.
【００３１】上記被覆率は、規則合金層の存在が確認さ
れた鋼板についてオージェ電子分光装置によるＡl およ
びＦe 元素によるマッピング分析（面分析）を行い、規
則合金層であると確認された領域の面積率から求めるこ
とができる。The above-mentioned coverage was determined by conducting a mapping analysis (area analysis) of Al and Fe elements on a steel sheet in which the existence of an ordered alloy layer was confirmed by an Auger electron spectrometer, and determining the area of a region confirmed to be an ordered alloy layer. It can be obtained from the rate.
【００３２】めっき皮膜の化学組成； Ａl ：溶融めっき時には、Ａｌ濃度が０．０５％以上、
０．２０％以下であるめっき浴を用いる。めっき浴Ａｌ
濃度が０．０５％に満たない場合には、めっき浴に浸漬
した際の母材表面での規則構造層の生成が不十分とな
り、後に施す合金化処理時に消失し、製品母材表面に規
則構造層を形成させることができない。好ましくは０．
０８％以上である。Chemical composition of plating film: Al: Al concentration is 0.05% or more during hot-dip plating;
Use a plating bath that is 0.20% or less. Plating bath Al
If the concentration is less than 0.05%, the formation of an ordered structure layer on the surface of the base material when immersed in the plating bath becomes insufficient, and the layer disappears during the alloying treatment to be performed later and becomes irregular on the surface of the product base material. The structural layer cannot be formed. Preferably 0.
08% or more.
【００３３】めっき浴のＡl 濃度が０．２０％を超える
と、合金化速度が遅くなり、通常の設備では十分に合金
化させることが困難となる。このため、めっき浴のＡl
濃度は０．２０％以下とする。好ましくは０．１５％以
下である。If the Al concentration in the plating bath exceeds 0.20%, the alloying speed becomes slow, and it becomes difficult to sufficiently alloy with ordinary equipment. Therefore, the plating bath Al
The concentration is set to 0.20% or less. Preferably it is 0.15% or less.
【００３４】めっき皮膜のＡl 含有量は、めっき浴のＡ
l 濃度とほぼ同一となるため、製品のめっき皮膜の化学
組成は、０．０５％以上、０．２０％以下とする。好ま
しくは０．０８％以上、０．１５％以下である。The Al content of the plating film is determined by the A
l Since the concentration is almost the same, the chemical composition of the plating film of the product should be 0.05% or more and 0.20% or less. Preferably it is 0.08% or more and 0.15% or less.
【００３５】ただし、後ほど述べるように、めっきに先
だって母材表面に蒸着処理などを施して規則構造を導入
する場合には、めっき浴にＡl を含有させなくても構わ
ない。However, as will be described later, when the base material surface is subjected to a vapor deposition treatment or the like prior to plating to introduce a regular structure, the plating bath may not contain Al.
【００３６】Ｆe ：めっき皮膜のＦe 含有量は８％以
上、１５％以下の範囲とする。Ｆe 含有量が８％に満た
ない場合には、めっき皮膜の表層部にζ相が残存する可
能性が高い。ζ相は他の合金相と較べて軟質であること
と、この相が生じるとめっき皮膜の表面粗度が大きくな
ることから、ζ相が残存すると合金化溶融亜鉛めっき鋼
板の摺動性が低下し、加工時のめっき皮膜の密着性が損
なわれる。より望ましくは９％以上である。Fe: The Fe content of the plating film is in the range of 8% or more and 15% or less. If the Fe content is less than 8%, there is a high possibility that the ζ phase will remain on the surface layer of the plating film. The ζ phase is softer than the other alloy phases, and if this phase occurs, the surface roughness of the plating film increases, so if the ζ phase remains, the slidability of the galvannealed steel sheet decreases. However, the adhesion of the plating film during processing is impaired. More preferably, it is 9% or more.
【００３７】Ｆe 含有量が１５％を超えると耐パウダリ
ング性が大幅に低下する。従ってめっき皮膜のＦe 含有
量は１５％以下とするのが望ましい。より望ましくは１
２％以下である。If the Fe content exceeds 15%, the powdering resistance is greatly reduced. Therefore, it is desirable that the Fe content of the plating film be 15% or less. More preferably 1
2% or less.
【００３８】残部は実質的にＺn とする。実質的に、と
の意味は、不可避的不純物以外に、合金化促進のために
Ｔi 、Ｍg を０．５％以下、合金相制御のためにＳi を
２％以下、Ｎi を０．５％以下、Ｍn を０．２％以下、
表面外観制御のためにＰb またはＳb を０．２％以下含
有させても構わないことを意味する。The balance is substantially Zn. Substantially means, besides inevitable impurities, Ti and Mg for promoting alloying of 0.5% or less, Si for controlling alloy phase of 2% or less, and Ni of 0.5% or less. , Mn is 0.2% or less,
This means that 0.2% or less of Pb or Sb may be contained for controlling the surface appearance.
【００３９】めっき付着量：めっき皮膜の付着量は特に
限定するものではないが、付着量が少な過ぎると付着量
の調整が困難になるので片面当たりで２０g/m2以上とす
るのが望ましい。めっき付着量の上限は特に制限するも
のではないが、付着量が多すぎると加工時にパウダリン
グが生じるおそれが増すので、片面あたりで１００g/m2
以下とするのが望ましい。The amount of plating: The amount of plating is not particularly limited. However, if the amount of plating is too small, it becomes difficult to adjust the amount of plating. Therefore, the amount is preferably 20 g / m 2 or more per side. The upper limit of the coating weight is not particularly limited, since a possibility that powdering during processing and the adhesion amount is too much occurs increases, 100 g / m 2 per one surface
It is desirable to do the following.
【００４０】めっき後の製品表面には公知のクロメート
処理、化成処理などを施しても構わない。 製造方法；本発明のめっき鋼板の好ましい製造方法を以
下に説明する。The product surface after plating may be subjected to a known chromate treatment, chemical conversion treatment, or the like. Production method: A preferred method for producing the plated steel sheet of the present invention will be described below.
【００４１】前処理：母材にはまず前処理を施すが、こ
れは、従来の技術の範囲であれば問題はない。通常はア
ルカリ脱脂をおこなう。その後、母材が焼鈍を必要とす
る場合には、常法により還元性雰囲気中で焼鈍を施し、
その後めっき浴温度近傍まで冷却して、所定の濃度のＡ
l を含有する溶融めっき浴に浸漬する。焼鈍を必要とし
ない場合には常法によりめっき浴温度近傍まで加熱し、
溶融めっき浴に浸漬して溶融めっきを施す。Pretreatment: The base material is first subjected to a pretreatment, but this is not a problem as long as it is within the range of the prior art. Usually, alkali degreasing is performed. Thereafter, if the base material requires annealing, it is annealed in a reducing atmosphere by a conventional method,
Then, it is cooled to the vicinity of the plating bath temperature, and A
Immersion in a hot-dip plating bath containing l. If annealing is not required, heat to around the plating bath temperature by the usual method,
It is immersed in a hot-dip plating bath to apply hot-dip plating.
【００４２】Ａl を含有しないめっき浴を用いる場合
や、密着性をより強固にしたい場合などでは、めっきに
先だって、母材にＡl 被覆層を設けるのがよい。その場
合のＡl 被覆方法は任意であるが、例えば、合金めっき
や溶融塩めっきなどの公知の化学的な被覆法、あるい
は、蒸着法、イオンプレーティング法、イオン注入法な
ど公知の物理的な被覆法などにより母材表面にＡl を被
覆し、次いでこれを加熱することにより母材中にＡl 原
子を拡散させる方法が好適である。When a plating bath containing no Al is used, or when it is desired to increase the adhesion, it is preferable to provide an Al coating layer on the base material prior to plating. In this case, the Al coating method is optional. For example, a known chemical coating method such as alloy plating or molten salt plating, or a known physical coating method such as a vapor deposition method, an ion plating method, or an ion implantation method. A preferred method is to coat the base material surface with Al by a method or the like and then to heat the base material to diffuse Al atoms into the base material.
【００４３】この場合のＡl 被覆層は厚さが０．１μｍ
程度あれば十分である。母材中にＡl 原子を拡散させる
方法は、例えば４００〜５００℃の温度範囲で、１〜６
０秒加熱するなどの方法が好適である。In this case, the Al coating layer has a thickness of 0.1 μm.
A degree is enough. The method of diffusing Al atoms into the base material is, for example, in a temperature range of 400 to 500 ° C., 1 to 6
A method such as heating for 0 seconds is suitable.
【００４４】溶融めっきは公知の連続式溶融めっき設備
を利用して施すのが好適であるが、バッチ処理方法な
ど、従来用いられている他の方法を用いても良い。めっ
き浴は、上記範囲内で所望のめっき皮膜の化学組成に合
わせればよい。The hot-dip plating is preferably carried out using a known continuous hot-dip plating equipment, but other conventional methods such as a batch processing method may be used. The plating bath may be adjusted to the desired chemical composition of the plating film within the above range.
【００４５】ただし、めっきに先だって母材表面に蒸着
処理などを施し、母材表面に規則構造を導入する場合に
は、めっき浴にＡl を含有させなくても構わない。めっ
き浴温度（Ｔp ）は４２０℃以上、５００℃以下とす
る。４２０℃に満たない場合にはめっき浴のＡl の母材
への拡散が不十分となり、規則構造の形成が十分ではな
い。５００℃を超えると、上記範囲の浴Ａl 濃度では、
Ｚn 蒸気が多くなりめっき前の鋼板を汚染して欠陥が生
じたり、また、浴中へのＦe の溶出量の増加によりめっ
き浴中にドロスが増加し、めっき皮膜に付着して表面欠
陥が生じるなど、操業上の問題が生じる。However, in the case where the base material surface is subjected to a vapor deposition treatment or the like prior to plating to introduce a regular structure on the base material surface, the plating bath may not contain Al. The plating bath temperature (Tp) is not less than 420 ° C and not more than 500 ° C. If the temperature is lower than 420 ° C., the diffusion of Al into the base material of the plating bath becomes insufficient, and the formation of an ordered structure is not sufficient. When the temperature exceeds 500 ° C., in the above bath Al concentration,
Zn vapor increases and contaminates the steel sheet before plating to cause defects, and dross increases in the plating bath due to an increase in the amount of Fe eluted into the bath, and adheres to the plating film to cause surface defects. And other operational problems.
【００４６】めっき浴への浸漬時間は０．１０秒以上、
５秒以下とする。浸漬時間が０．１０秒に満たない場合
には規則構造の形成が十分ではなく、５秒を超えると生
産能率が低下するのでよくない。The immersion time in the plating bath is 0.10 second or more,
5 seconds or less. If the immersion time is less than 0.10 seconds, the formation of the ordered structure is not sufficient, and if it exceeds 5 seconds, the production efficiency decreases, which is not good.
【００４７】めっき浴に浸漬した後、引き上げてガスワ
イピングなど公知の方法により付着量を調整し、次いで
合金化温度に加熱して合金化処理を施す。加熱炉はガス
加熱炉、誘導加熱炉、赤外線加熱炉、直接通電加熱炉な
ど、公知のものを用いればよい。After being immersed in the plating bath, it is pulled up, the amount of adhesion is adjusted by a known method such as gas wiping, and then heated to an alloying temperature to perform an alloying treatment. Known heating furnaces such as a gas heating furnace, an induction heating furnace, an infrared heating furnace, and a direct current heating furnace may be used.
【００４８】その際、規則構造層の不規則化を防止する
ために、母材に作用する張力（Ｓt、MPa ）を、２０MPa
以下、かつ、Ｓt ≦｛２８０．５５−０．３５（Ｔp
＋２７３）｝を満足する範囲として合金化処理を施す。
但しＴp はめっき浴の温度（℃）である。At this time, the tension (St, MPa) acting on the base material is set to 20 MPa to prevent the ordered structure layer from becoming irregular.
And St ≦ ｛280.55−0.35 (Tp
+273) An alloying process is performed to satisfy the range of｝.
Here, Tp is the temperature (° C.) of the plating bath.
【００４９】上記張力が２０MPa を超えると合金化時に
不規則化が進行する。上記式は経験式として求められた
ものであり、めっき浴温度に対して張力が上記関係式を
満足しない場合には不規則化が進行する。張力の下限は
任意であるが、安定して製造するには１MPa 以上の張力
があった方が好ましい。If the tension exceeds 20 MPa, disordering proceeds during alloying. The above equation is obtained as an empirical equation. If the tension does not satisfy the above relational equation with respect to the plating bath temperature, the irregularization proceeds. The lower limit of the tension is arbitrary, but it is preferable that the tension be 1 MPa or more for stable production.
【００５０】また、合金化温度への加熱速度を、めっき
直後から合金化温度までの平均で、５℃／秒以上、２０
０℃／秒以下として合金化処理を施す。合金化温度への
加熱速度が５℃／秒に満たない場合には、通常の合金化
処理炉では加熱時間が不足し、到達温度が低くなり合金
化を十分行うことができない。より望ましくは８℃／秒
以上である。加熱速度が２００℃を超えると、不規則化
が進行し密着性改善効果が得られない。より望ましくは
５０℃／秒以下である。The rate of heating to the alloying temperature was 5 ° C./sec or more on average from immediately after plating to the alloying temperature.
Alloying treatment is performed at a temperature of 0 ° C./sec or less. If the heating rate to the alloying temperature is less than 5 ° C./sec, the heating time is short in a normal alloying furnace, the temperature reached is low, and alloying cannot be performed sufficiently. More preferably, it is 8 ° C./sec or more. If the heating rate exceeds 200 ° C., irregularity proceeds, and the effect of improving adhesion cannot be obtained. More desirably, it is 50 ° C./sec or less.
【００５１】合金化温度は従来技術と同様でよく、例え
ば、４８０℃以上、６００℃以下でよい。４８０℃に満
たない場合には合金化が完了するまでに長時間を要する
ので生産性が悪く、６００℃を超えると合金化が過度に
進行してめっき皮膜の耐パウダリング性が損なわれる。
不規則化の影響を軽減するには５５０℃以下とするのが
望ましい。The alloying temperature may be the same as that of the prior art, and may be, for example, 480 ° C. or more and 600 ° C. or less. If the temperature is lower than 480 ° C., it takes a long time to complete the alloying, resulting in poor productivity. If the temperature exceeds 600 ° C., the alloying proceeds excessively, and the powdering resistance of the plating film is impaired.
In order to reduce the influence of irregularity, the temperature is desirably 550 ° C. or lower.
【００５２】合金化温度での保持時間は所望のＦe 含有
量が得られるように調整すればよいが、不規則化を避け
るために、６０秒以下とするのが望ましい。合金化処理
後は常法により常温まで冷却すればよい。その際の冷却
速度は限定しない。上記冷却後には、常法により、調質
圧延、クロメート処理、化成処理などの後処理を施して
も構わない。The holding time at the alloying temperature may be adjusted so as to obtain a desired Fe content, but is preferably set to 60 seconds or less in order to avoid irregularity. After the alloying treatment, it may be cooled to a normal temperature by a conventional method. The cooling rate at that time is not limited. After the cooling, post-treatments such as temper rolling, chromate treatment, and chemical conversion treatment may be performed by a conventional method.
【００５３】以上述べた本発明のめっき鋼板の製造方法
は、特殊な装置を必要とせず、製造条件を適正範囲に管
理する方法であるので、効率よく、また、低い製造コス
トでおこなうことができる。The method for producing a plated steel sheet according to the present invention described above does not require any special equipment and is a method for controlling the production conditions within an appropriate range, so that it can be carried out efficiently and at low production cost. .
【００５４】[0054]
【実施例】ＪＩＳ−Ｇ３１４１に規定されている低炭素
鋼の厚さ：０．８mm、幅：２００mmの冷延鋼帯を母材と
し、これを１０％水酸化ナトリウム水溶液中で脱脂した
後、溶融めっきシミュレータを用いて、水素ガスが１０
体積％、残部が窒素ガスからなり、露点が−３０℃以下
である雰囲気中で８００℃に加熱し、６０秒間保持する
再結晶焼鈍を施し、めっき浴温度近傍まで冷却して、種
々の温度の溶融めっき浴中に種々の時間浸漬し、引き上
げてガスワイピング法で付着量を片面あたり（５０±１
０）g/m2に調整し、次いでインダクションヒータによ
り、１０〜８０℃／秒の加熱速度で、５００℃〜５４０
℃まで加熱し、この温度での保持時間を種々変更して、
めっき皮膜のＦe 含有量を８〜１５％の範囲に調整し
た。めっき浴のＡl 濃度は種々変更した。めっき浴浸漬
後、合金化処理を施し、４００℃に冷却されるまでの間
の母材には、２〜５０MPa の張力を作用させた。EXAMPLE A cold-rolled steel strip having a thickness of 0.8 mm and a width of 200 mm as defined in JIS-G3141 was used as a base material, which was degreased in a 10% aqueous sodium hydroxide solution. Using a hot-dip plating simulator, hydrogen gas
Volume%, the balance consisting of nitrogen gas, heated to 800 ° C. in an atmosphere having a dew point of −30 ° C. or less, subjected to recrystallization annealing for 60 seconds, cooled to near the plating bath temperature, and cooled to various temperatures. It was immersed in a hot-dip plating bath for various times, pulled up, and the amount of adhesion per side was determined by gas wiping method (50 ± 1
0) Adjust to g / m 2 , and then use an induction heater at a heating rate of 10 to 80 ° C./sec.
° C, and variously change the holding time at this temperature,
The Fe content of the plating film was adjusted to a range of 8 to 15%. The Al concentration in the plating bath was varied. After immersion in the plating bath, an alloying treatment was performed, and a tension of 2 to 50 MPa was applied to the base material until it was cooled to 400 ° C.
【００５５】得られた鋼板の性能を以下の方法で評価し
た。 規則構造の確認：電子顕微鏡観察用のめっき鋼板断面試
料は、集束イオンビーム加工装置を用い、めっき皮膜／
鋼板界面を含む断面の約１５ミクロン×１５ミクロンの
領域を、観察可能な約１００nm（ナノメータ）の厚さま
で薄片化した。透過電子顕微鏡を用いて母材側界面の選
択領域から電子回折図形を収集し、鋼板表面部の回折図
形上に体心立方格子の規則格子回折斑点（[100] 、[11
1] 、[210] など）が存在するか否かで、規則構造層の
有無を判断した。観察は１サンプルにつき１０以上の視
野についておこなった。The performance of the obtained steel sheet was evaluated by the following method. Confirmation of ordered structure: The cross-section of a plated steel sheet sample for electron microscopic observation was measured using a focused ion beam
An area of about 15 μm × 15 μm of the cross section including the steel plate interface was sliced to a thickness of about 100 nm (nanometer) observable. Using a transmission electron microscope, electron diffraction patterns are collected from the selected region on the base metal side interface, and regular lattice diffraction spots of the body-centered cubic lattice ([100], [11]
[1], [210], etc.), the presence or absence of a rule structure layer was determined. Observations were made for 10 or more visual fields per sample.
【００５６】上記観察により規則構造が確認された鋼板
については、オージェ電子分光装置を用いて、Ａl およ
びＦe 元素によるマッピング分析（面分析）をおこな
い、規則構造であると確認された領域の面積率を調査し
た。For the steel sheet whose ordered structure was confirmed by the above observation, mapping analysis (area analysis) using Al and Fe elements was performed using an Auger electron spectrometer, and the area ratio of the region confirmed to be ordered was determined. investigated.
【００５７】めっき皮膜の密着性：自動車用鋼板の評価
方法にならって、耐パウダリング性と低温対衝撃耐久性
の評価により密着性を判断した。耐パウダリング性試
験：合金化処理した供試材を直径６０mmの円形のブラン
クに打ち抜き、これを直径が３０m m のポンチと、ダイ
ス肩半径が３mmのダイを用いて円筒カップに成形し、絞
り試験を行った後、外側円筒部のテープ剥離を行い、剥
離程度を目視により観察して、次の基準により評価し
た。 ◎（極めて良好）、 ○（かなり良好）、 △（良好）、 ×（劣る）。Adhesion of plating film: Adhesion was judged by evaluating powdering resistance and low-temperature impact durability in accordance with the method for evaluating steel sheets for automobiles. Powdering resistance test: The alloyed test material was punched into a circular blank with a diameter of 60 mm, and this was formed into a cylindrical cup using a punch having a diameter of 30 mm and a die having a die shoulder radius of 3 mm. After the test, the tape was peeled from the outer cylindrical portion, the degree of peeling was visually observed, and evaluated according to the following criteria. ◎ (very good), （(very good), △ (good), × (poor).
【００５８】低温対衝撃耐久性：−４０℃の低温環境下
において、供試台上の塗装済みの供試材に対して、直径
が約３mmのダイヤモンド粒を時速１２０ｋmに相当する
速度で１０箇所に衝突させる衝撃を与えた。その後、工
業地域の大気中で暴露する耐食性暴露試験を５年間継続
した。暴露期間中は１ヶ月に１回の頻度でＮaＣlを３％
含有する水溶液に３０分間浸漬した。上記試験終了後、
ダイヤモンド粒の衝突点に生じた塗膜ブリスターの最大
径を測定し、低温対衝撃耐久性を以下の基準で評価し
た。 ◎（著しく良好）：ブリスター発生せず、 ○（かなり良好）：最大径＜１mm、 △（良好）：最大径が１mm以上、３mm未満、 ×（劣る）：最大径≧３mm。Low-temperature durability against impact: Under a low-temperature environment of -40 ° C., diamond particles having a diameter of about 3 mm were applied to 10 places at a speed corresponding to 120 km / h on a painted test material on a test table. Shocked to hit. Thereafter, a corrosion resistance exposure test for exposure in the atmosphere of an industrial area was continued for 5 years. 3% NaCl once a month during the exposure period
It was immersed in the contained aqueous solution for 30 minutes. After the above test,
The maximum diameter of the coating film blister generated at the collision point of the diamond particles was measured, and the low-temperature impact resistance was evaluated according to the following criteria. ◎ (extremely good): no blisters were generated, （(very good): maximum diameter <1 mm, Δ (good): maximum diameter was 1 mm or more and less than 3 mm, × (poor): maximum diameter ≧ 3 mm.
【００５９】表１に、めっき皮膜の化学組成、規則構造
層の被覆率および密着性試験結果を示す。Table 1 shows the chemical composition of the plating film, the coverage of the ordered structure layer, and the results of the adhesion test.
【００６０】[0060]
【表１】 [Table 1]
【００６１】表１に示すように、規則構造層を備えた場
合にはめっき皮膜の密着性、耐パウダリング性、低温対
衝撃耐久性ともに良好であった。これに対し、めっき皮
膜の化学組成が本発明の規定する範囲から外れた試験番
号１８〜２１、２３、あるいは規則構造層が生成しなか
った試験番号２２などでは密着性がよくなかった。ま
た、めっき皮膜のＦe 含有量が８％に満たなかった試験
番号１９、２０などでは加工時にめっき剥離（いわゆる
フレーキング不良）が発生した。As shown in Table 1, when the regular structure layer was provided, the adhesion of the plating film, the powdering resistance, and the durability against impact at low temperatures were good. On the other hand, in Test Nos. 18 to 21 and 23 in which the chemical composition of the plating film was out of the range specified by the present invention, or in Test No. 22 in which no ordered structure layer was formed, the adhesion was not good. In Test Nos. 19 and 20 where the Fe content of the plating film was less than 8%, plating peeling (so-called flaking defect) occurred during processing.
【００６２】[0062]
【発明の効果】本発明の溶融めっき鋼板は加工時のめっ
き密着性、耐パウダリング性、低温対衝撃耐久性に優れ
るので自動車、家電製品、建材などに用いられる防錆性
に優れた鋼板として好適である。また、本発明の鋼板は
現状の設備で製造条件を特定範囲に制限することで、効
率よく、かつ、製造コスト面でも安価な方法で、製造す
ることができるので、極めて有用である。EFFECT OF THE INVENTION The hot-dip coated steel sheet of the present invention is excellent in plating adhesion during processing, powdering resistance, and low-temperature impact resistance, so that it is excellent in rust prevention for use in automobiles, home appliances, building materials, etc. It is suitable. In addition, the steel sheet of the present invention is extremely useful because it can be manufactured efficiently and by a method that is inexpensive in terms of manufacturing cost by limiting the manufacturing conditions to a specific range with the current equipment.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 荒井 正浩 大阪府大阪市中央区北浜４丁目５番33号 住友金属工業株式会社内 Ｆターム(参考） 4K027 AA02 AA22 AB26 AB28 AB32 AC12 AC15 AC18 AC73 AE02 AE03 AE11 AE12 AE13 AE18 AE27 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masahiro Arai 4-5-33 Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metal Industries Co., Ltd. F-term (reference) 4K027 AA02 AA22 AB26 AB28 AB32 AC12 AC15 AC18 AC73 AE02 AE03 AE11 AE12 AE13 AE18 AE27
Claims (4)
以上、０．２０％以下、Ｆe を８％以上、１５％以下含
有し、残部が実質的にＺn よりなる合金化溶融亜鉛めっ
き皮膜を備えた溶融めっき鋼板であって、めっき皮膜と
母材との界面領域に、体心立方格子を基礎とし、主とし
てＦe 原子とＡl 原子とによって構成される規則構造を
呈する層を備えたものであることを特徴とする合金化溶
融亜鉛めっき鋼板。(1) 0.05% by mass of Al on the surface of a base material
A hot-dip galvanized steel sheet comprising an alloyed hot-dip galvanized film containing 0.20% or less, Fe of 8% or more and 15% or less, and the balance substantially consisting of Zn, An alloyed hot-dip galvanized steel sheet comprising a layer having a regular structure mainly composed of Fe atoms and Al atoms, based on a body-centered cubic lattice, in an interface region of (1).
率で母材表面の１０％以上であることを特徴とする請求
項１に記載の合金化溶融亜鉛めっき鋼板。2. The alloyed hot-dip galvanized steel sheet according to claim 1, wherein the abundance ratio of the layer having a regular structure is 10% or more of the area ratio of the base material surface.
母材を、質量％でＡl を０．０５％以上、０．２０％以
下含有し、残部が実質的にＺn からなる、４２０℃以
上、５００℃以下の溶融めっき浴に、０．１秒以上、５
秒以下浸漬してめっきし、付着量を調整し、次いで、母
材に作用する張力（Ｓt 、単位：MPa ）を、２０MPa 以
下、かつ、Ｔp をめっき浴の温度（℃）として、Ｓt ≦
｛２８０．５５−０．３５（Ｔp ＋２７３）｝を満足す
る範囲とし、５℃／秒以上、２００℃／秒以下の加熱速
度で合金化処理温度に加熱して合金化処理を施すことを
特徴とする請求項１または２に記載の合金化溶融亜鉛め
っき鋼板の製造方法。3. A base material having at least a ferrite phase on its surface, containing Al in an amount of 0.05% or more and 0.20% or less by mass%, and the balance substantially consisting of Zn. 0.1 seconds or more in the following hot-dip bath
The plating amount is adjusted by immersing the base material for up to 20 seconds, and then the tension (St, unit: MPa) acting on the base material is set to 20 MPa or less, and Tp is defined as the temperature (° C.) of the plating bath.
{280.55 to 0.35 (Tp + 273)} is satisfied, and the alloying treatment is performed by heating to an alloying treatment temperature at a heating rate of 5 ° C / sec or more and 200 ° C / sec or less. The method for producing a galvannealed steel sheet according to claim 1 or 2.
母材の被めっき面にＡl を被覆した後、前記溶融めっき
浴に浸漬して溶融めっきを施すことを特徴とする請求項
３記載の合金化溶融亜鉛めっき鋼板の製造方法。4. The alloying hot-dip according to claim 3, wherein Al is coated on at least the surface to be plated of the base material having a ferrite phase on the surface, and then dipped in the hot-dip plating bath to perform hot-dip plating. Manufacturing method of galvanized steel sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000376225A JP2002180224A (en) | 2000-12-11 | 2000-12-11 | Galvannealed steel sheet and its production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000376225A JP2002180224A (en) | 2000-12-11 | 2000-12-11 | Galvannealed steel sheet and its production method |
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| Publication Number | Publication Date |
|---|---|
| JP2002180224A true JP2002180224A (en) | 2002-06-26 |
Family
ID=18845118
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000376225A Withdrawn JP2002180224A (en) | 2000-12-11 | 2000-12-11 | Galvannealed steel sheet and its production method |
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| Country | Link |
|---|---|
| JP (1) | JP2002180224A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008538384A (en) * | 2005-02-24 | 2008-10-23 | ティッセンクルップ スチール アクチェンゲゼルシャフト | Method for coating steel strip and steel strip with said coating |
| WO2012053694A1 (en) * | 2010-10-21 | 2012-04-26 | 주식회사 포스코 | Galvanized steel sheet having excellent coatability, coating adhesion, and spot weldability, and method for manufacturing same |
| KR101188065B1 (en) | 2009-08-18 | 2012-10-04 | 주식회사 포스코 | Galvanized steel sheet having excellent coating adhesion and spot weldability and method for manufacturing the same |
| WO2013095007A1 (en) * | 2011-12-23 | 2013-06-27 | Posco | Hot-dip galvanized steel sheet having excellent adhesiveness at ultra-low temperatures and method of manufacturing the same |
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2000
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|---|---|---|---|---|
| JP2008538384A (en) * | 2005-02-24 | 2008-10-23 | ティッセンクルップ スチール アクチェンゲゼルシャフト | Method for coating steel strip and steel strip with said coating |
| KR101188065B1 (en) | 2009-08-18 | 2012-10-04 | 주식회사 포스코 | Galvanized steel sheet having excellent coating adhesion and spot weldability and method for manufacturing the same |
| WO2012053694A1 (en) * | 2010-10-21 | 2012-04-26 | 주식회사 포스코 | Galvanized steel sheet having excellent coatability, coating adhesion, and spot weldability, and method for manufacturing same |
| EP2728032A4 (en) * | 2011-06-28 | 2015-03-11 | Posco | Plated steel sheet having plated layer with excellent stability for hot press molding |
| US9314997B2 (en) | 2011-06-28 | 2016-04-19 | Posco | Plated steel sheet having plated layer with excellent stability for hot press molding |
| WO2013095007A1 (en) * | 2011-12-23 | 2013-06-27 | Posco | Hot-dip galvanized steel sheet having excellent adhesiveness at ultra-low temperatures and method of manufacturing the same |
| CN104011252A (en) * | 2011-12-23 | 2014-08-27 | Posco公司 | Hot-dip galvanized steel sheet having excellent adhesiveness at ultra-low temperatures and method of manufacturing the same |
| JP2015500925A (en) * | 2011-12-23 | 2015-01-08 | ポスコ | Hot-dip galvanized steel sheet with excellent cryogenic bonding properties and manufacturing method thereof |
| US9260787B2 (en) | 2011-12-23 | 2016-02-16 | Posco | Hot-dip galvanized steel sheet having excellent adhesiveness at ultra-low temperatures |
| CN104011252B (en) * | 2011-12-23 | 2017-07-18 | Posco公司 | Hot-dip galvanized steel sheet and its manufacture method with excellent adhesiveness under ultralow temperature |
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