JP2000248349A - Hot-dip aluminized steel sheet excellent in corrosion resistance and production thereof - Google Patents
Hot-dip aluminized steel sheet excellent in corrosion resistance and production thereofInfo
- Publication number
- JP2000248349A JP2000248349A JP4970199A JP4970199A JP2000248349A JP 2000248349 A JP2000248349 A JP 2000248349A JP 4970199 A JP4970199 A JP 4970199A JP 4970199 A JP4970199 A JP 4970199A JP 2000248349 A JP2000248349 A JP 2000248349A
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- Japan
- Prior art keywords
- steel sheet
- hot
- corrosion resistance
- plating layer
- surface roughness
- 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.)
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- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、耐食性に優れた溶
融アルミニウムめっき鋼板およびその製造方法に関す
る。The present invention relates to a hot-dip aluminum-coated steel sheet having excellent corrosion resistance and a method for producing the same.
【０００２】[0002]
【従来の技術】溶融アルミニウム鋼板は、良好な耐食
性、耐熱性等を有することから、自動車用排気系部材，
熱器具用部材等として広く実用されている。連続溶融ア
ルミニウムめっきは、図６に示すように、鋼板（１０）
を、所定の浴組成・浴温度に保持された溶融めっき浴
（１１）に導通することにより行われ、浴上に導出され
た鋼板は、めっき付着量制御装置（ガスワイピング等）
（１２）によりめっき層厚を調節されたうえ、冷却装置
（衝風冷却等）（１３）で冷却されながら移送される。2. Description of the Related Art Molten aluminum steel sheets have good corrosion resistance and heat resistance, so that they can be used for automobile exhaust systems,
It is widely used as a member for heating appliances. As shown in FIG. 6, continuous hot-dip aluminum plating is performed on a steel plate (10).
Is passed through a hot-dip plating bath (11) maintained at a predetermined bath composition and bath temperature.
After the thickness of the plating layer is adjusted by (12), it is transferred while being cooled by a cooling device (such as blast cooling) (13).
【０００３】溶融アルミニウムめっき浴には、Ｓｉを含
有するＡｌ−Ｓｉ合金浴が使用される。めっき浴をＳｉ
含有組成とするのは、めっき層と素地鋼との界面に生じ
る反応［Ａｌと素地Ｆｅとの反応により硬く脆い金属間
化合物が生成し、製品めっき鋼板の加工性が損なわれ
る］を抑制するためである。そのＳｉ含有量は通常、約
６〜１２重量％の範囲に調節される。上記めっき鋼板
は、鋼板の形状矯正および降伏点伸び解消等のためにス
キンパスミルによる調質圧延を施されて製品に仕上げら
れる。美麗な表面肌を要求される場合は、ダルロールに
よるスキンパスミルにおいてめっき層の表面粗度が調整
される。近時は、表面肌重視の観点から、めっき層の表
面粗度を大きくする傾向にあり、Ｒｍａｘ約２０μｍ程
度の粗度に調整されることも多い。[0003] As a hot-dip aluminum plating bath, an Al-Si alloy bath containing Si is used. Si plating bath
In order to suppress the reaction occurring at the interface between the plating layer and the base steel [the reaction between Al and the base Fe generates a hard and brittle intermetallic compound, thereby impairing the workability of the product plated steel sheet]. It is. Its Si content is usually adjusted in the range of about 6 to 12% by weight. The plated steel sheet is subjected to temper rolling by a skin pass mill in order to correct the shape of the steel sheet and eliminate elongation at the yield point, etc., and finish the product. When beautiful surface skin is required, the surface roughness of the plating layer is adjusted in a skin pass mill using a dull roll. In recent years, from the viewpoint of emphasizing the surface skin, the surface roughness of the plating layer tends to be large, and is often adjusted to Rmax of about 20 μm.
【０００４】[0004]
【発明が解決しようとする課題】溶融アルミニウムめっ
き鋼板の耐食性は、塩水噴霧試験等による評価に大きな
差異を生じることがあり、製品間の耐食性の安定性に問
題がある。この品質のバラツキは、表面肌重視の観点か
ら、ダルロールを用いたスキンパスミルによる調質圧延
において、粗い表面粗度を付与された製品に生じ易い傾
向がある。本発明者等は、下記のように、めっき層の金
属組織およびめっき層の表面粗度が上記めっき鋼板の耐
食性に大きな影響を与えることを見出した。The corrosion resistance of a hot-dip aluminum-coated steel sheet may have a large difference in evaluation by a salt spray test or the like, and there is a problem in stability of corrosion resistance between products. From the viewpoint of emphasizing the surface skin, this quality variation tends to easily occur in a product provided with a rough surface roughness in temper rolling by a skin pass mill using a dull roll. The present inventors have found that the metal structure of the plating layer and the surface roughness of the plating layer greatly affect the corrosion resistance of the plated steel sheet as described below.
【０００５】溶融アルミニウムめっき鋼板は、図３に示
すように、Ａｌを主成分とするＡｌ−Ｓｉ合金めっき層
（以下,単に「めっき層」とも称する）（１）と、素地
鋼（３）との反応生成物層（Ｆｅ−Ａｌ−Ｓｉ金属間化
合物層）（２）を有する。めっき層（１）は、めっき金
属の凝固過程の早い段階で晶出生成したＡｌリッチの結
晶相（母相）（１１）と、それにつづいて晶出生成した
Ｓｉリッチの結晶相（Ｓｉリッチ相）（１２）からなる
金属組織を有している。Ｓｉリッチ相（１２）は、Ａｌ
リッチの母相（１１）に比べて著しく腐食を生じ易く、
このためＳｉリッチ相（１２）が局所的に生成した部分
は、腐食性物質（Ｃｌ−，Ｈ２Ｏ，Ｏ−等）がめっき層
内部に浸入する経路となり、素地鋼（３）と腐食物質と
の接触を生じ易い。素地鋼（３）に腐食物質が接触する
と、電気的に卑である素地鋼の腐食が急速に進行する。As shown in FIG. 3, a hot-dip aluminum-plated steel sheet is composed of an Al—Si alloy plating layer containing Al as a main component (hereinafter, also simply referred to as a “plating layer”) (1) and a base steel (3). Reaction product layer (Fe-Al-Si intermetallic compound layer) (2). The plating layer (1) includes an Al-rich crystal phase (mother phase) (11) crystallized and formed at an early stage of the solidification process of the plating metal, and a Si-rich crystal phase (Si-rich phase) crystallized and formed subsequently. ) (12). The Si rich phase (12) is Al
Significantly more susceptible to corrosion than the rich matrix (11),
For this reason, the portion where the Si-rich phase (12) is locally formed is a path through which corrosive substances (such as Cl − , H 2 O, and O − ) enter the plating layer, and the base steel (3) and the corrosive substance Contact with the surface. When a corrosive substance comes into contact with the base steel (3), the corrosion of the base metal that is electrically base rapidly proceeds.
【０００６】また、ダルロールによる調質圧延を施され
ためっき鋼板のめっき層は、図４に示すように、凹凸表
面を有する。めっき層（１）の表面の凹部（１３）は、
ダルロール表面の凸部に押圧されて圧縮・減厚した部分
である。Ｓｉリッチ相（１２）が局所的に生成している
部分に、ダル面の凸部が押圧されると、めっき層の圧縮
・減厚によりＳｉリッチ相（１２）の分布が密となり、
その結晶片の相互の接触が高まる。このため、Ｓｉリッ
チ相（１２）の腐食に伴い、素地鋼（３）に対する腐食
物質の供給および素地鋼の腐食が助長される。本発明
は、溶融アルミニウムめっき鋼板の腐食に関する上記知
見に基づいて、耐食性のバラツキを解消し、製品間の品
質の安定性に優れた溶融アルミニウムめっき鋼板および
その製造方法を提供するものである。[0006] Further, the plating layer of the plated steel sheet subjected to the temper rolling by the dull roll has an uneven surface as shown in FIG. The concave portion (13) on the surface of the plating layer (1)
This portion is compressed and reduced in thickness by being pressed by the convex portion of the dull roll surface. When the convex portion of the dull surface is pressed to a portion where the Si-rich phase (12) is locally generated, the distribution of the Si-rich phase (12) becomes dense due to compression and thickness reduction of the plating layer,
The mutual contact of the crystal pieces increases. Therefore, with the corrosion of the Si-rich phase (12), the supply of the corrosive substance to the base steel (3) and the corrosion of the base steel are promoted. The present invention is to provide a hot-dip aluminum-coated steel sheet which is free from variation in corrosion resistance and has excellent quality stability between products, based on the above-mentioned knowledge on corrosion of a hot-dip aluminum-coated steel sheet, and a method for producing the same.
【０００７】[0007]
【課題を解決するための手段】本発明の溶融アルミニウ
ムめっき鋼板は、Ｓｉ含有量が６〜１２重量％で、Ａｌ
リッチの母相中に、Ｓｉリッチ相が分散生成した金属組
織を有するめっき層における、前記Ａｌリッチ相の大き
さ（Ｓ）が２５μｍ以下であり、ダルロールによるスキ
ンパスで付与されためっき層の表面粗度(Ｒｍａｘ)が１
５μｍ以下に規制されている。The hot-dip aluminized steel sheet according to the present invention has a Si content of 6 to 12% by weight,
The size (S) of the Al-rich phase in the plating layer having a metal structure in which a Si-rich phase is dispersed and generated in a rich matrix is 25 μm or less, and the surface roughness of the plating layer provided by a skin pass using a dull roll Degree (Rmax) is 1
It is regulated to 5 μm or less.
【０００８】本発明において、めっき層のＡｌリッチ相
（母相）（１１）の大きさ（Ｓ）とは、図５に示すよう
に、めっき層（１）と金属間化合物（２）の合計層厚を
二等分する仮想線（中心線Ａ）が、母相（１１）中に分
散生成しているＳｉリッチ相（１２）と交叉する間の距
離（Ｓ）を意味している。In the present invention, the size (S) of the Al-rich phase (mother phase) (11) of the plating layer is, as shown in FIG. The imaginary line (center line A) bisecting the layer thickness means the distance (S) between the intersection with the Si-rich phase (12) dispersed and generated in the matrix (11).
【０００９】本発明の溶融アルミニウムめっき鋼板は、
連続溶融アルミニウムめっきラインにおいて、Ｓｉ含有
量６〜１２重量％のＡｌ−Ｓｉ合金めっき浴中に鋼板を
導入し、めっき浴上で冷却速度１０℃／秒以上の急速冷
却を施してめっき層を形成した後、ダルロールを用いた
スキンパスミルによる調質圧延において、めっき層に付
与される表面粗度を、Ｒｍａｘ１５μｍ以下とすること
からなる工程を経ることにより製造される。The hot-dip aluminized steel sheet of the present invention
In a continuous hot-dip aluminum plating line, a steel sheet is introduced into an Al-Si alloy plating bath having a Si content of 6 to 12% by weight, and is subjected to rapid cooling at a cooling rate of 10 ° C./sec or more on the plating bath to form a plating layer. After that, in a temper rolling by a skin pass mill using a dull roll, it is manufactured through a process of reducing the surface roughness imparted to the plating layer to Rmax 15 μm or less.
【００１０】本発明は、上記のように、めっき層の母相
（Ａｌリッチ結晶相）（１１）の大きさ(Ｓ)および調質
圧延におけるめっき層の表面粗度の制御の効果として、
めっき層内のＳｉリッチ相（１２）の存在に起因する前
記弊害を抑制緩和し、良好な耐食性を確保することを可
能にしている。As described above, the present invention provides the following effects of controlling the size (S) of the matrix phase (Al-rich crystal phase) (11) of the plating layer and the surface roughness of the plating layer in temper rolling.
The adverse effects caused by the presence of the Si-rich phase (12) in the plating layer are suppressed and alleviated, and it is possible to secure good corrosion resistance.
【００１１】[0011]
【発明の実施の形態】以下、本発明について具体的に説
明する。めっき浴から導出される鋼板表面に付着しため
っき金属は、その冷却過程で、Ａｌリッチの結晶が晶出
して母相を形成し、ついでＳｉリッチの結晶相が晶出生
成する。めっき浴組成（Ｓｉ含有量）が同じで、Ａｌリ
ッチ結晶とＳｉリッチ結晶の生成量比が同じであれば、
母相となるＡｌリッチ相（１１）が微細化されるに伴っ
て、Ｓｉリッチ相（１２）の晶出が分散される。その晶
出分散の効果として、Ｓｉリッチ結晶片の相互の接触頻
度が低くなり、めっき層を貫通する腐食物質の侵入経路
の形成および素地鋼に対する腐食物質の接触が抑制防止
される。この効果を得るには、Ａｌリッチ母相（１１）
の大きさ（Ｓ）を２５μｍ以下に規制することを要す
る。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described specifically. In the cooling process, the Al-rich crystals crystallize out of the plating metal adhering to the steel sheet surface derived from the plating bath to form a mother phase, and then the Si-rich crystal phase crystallizes. If the plating bath composition (Si content) is the same and the production ratio of Al-rich crystal and Si-rich crystal is the same,
As the Al-rich phase (11) serving as the mother phase is refined, the crystallization of the Si-rich phase (12) is dispersed. As an effect of the crystallization dispersion, the frequency of contact between the Si-rich crystal pieces is reduced, so that the formation of a corrosive substance intrusion path penetrating the plating layer and the contact of the corrosive substance with the base steel are suppressed and prevented. To obtain this effect, the Al-rich matrix (11)
Must be regulated to 25 μm or less.
【００１２】上記のＡｌリッチ母相の大きさ（Ｓ）は、
溶融めっき浴上に導出された鋼板のめっき金属の冷却速
度により制御される。図１は、その冷却速度と、Ａｌリ
ッチ母相の大きさ(Ｓ)との相関を示している［供試めっ
き鋼板：めっき浴 ９〜１２重量％Ｓｉ−Ａｌ，めっき
金属付着量：３０〜６０ｇ／ｍ２・片面］。図示のよう
に、冷却速度１０℃／ｓｅｃの急速冷却により、Ａｌリ
ッチ母相の大きさ(Ｓ)２５μｍ以下が確保されている。
なお、約２０℃／ｓｅｃを越える急速冷却を加えても、
微細化効果の実質的な増加はないので、それを越える急
速冷却とする必要はない。The size (S) of the Al-rich matrix is as follows:
It is controlled by the cooling rate of the plated metal of the steel sheet led out onto the hot-dip plating bath. FIG. 1 shows the correlation between the cooling rate and the size (S) of the Al-rich matrix [Test plated steel sheet: plating bath 9 to 12% by weight Si-Al, plating metal adhesion amount: 30 to 60g / m 2 · one side]. As shown in the figure, the size (S) of the Al-rich matrix is 25 μm or less by rapid cooling at a cooling rate of 10 ° C./sec.
In addition, even if rapid cooling exceeding about 20 ° C./sec is applied,
There is no substantial increase in the miniaturization effect, so there is no need for rapid cooling beyond that.
【００１３】Ａｌリッチ相の大きさ(Ｓ)を規制するため
の急速冷却は、めっき浴上に配置されている冷却装置
（１２）の冷却出力比（送風流量）を制御することによ
り行われる。めっき浴上に導出されためっき鋼板に急速
冷却を施すことは、Ａｌリッチ母相を微細化する効果の
ほかに、めっき金属と素地鋼との界面反応（硬質のＦｅ
−Ａｌ−Ｓｉ金属間化合物生成）が抑制されることによ
る、製品めっき鋼板の加工性・めっき密着性の改善をも
たらす。The rapid cooling for controlling the size (S) of the Al-rich phase is performed by controlling the cooling output ratio (flow rate) of a cooling device (12) arranged on the plating bath. Rapid cooling of the plated steel sheet led out onto the plating bath not only has the effect of making the Al-rich matrix finer, but also has an interface reaction between the plated metal and the base steel (hard Fe).
-Al-Si intermetallic compound) is suppressed, thereby improving the workability and plating adhesion of the product plated steel sheet.
【００１４】なお、めっき浴として、Ｓｉ含有量６〜１
２重量％の浴組成を使用しているのは、Ｓｉ量がこれに
満たないと、めっき金属と素地鋼との界面反応の抑制効
果が不足し、他方その範囲を越えると、めっき層の硬質
化をきたし、いずれの場合も製品めっき鋼板の加工性、
めっき密着性が損なわれるからであり、この浴組成は、
通常の溶融アルミニウムめっきのそれと特に異ならな
い。The plating bath has a Si content of 6-1.
When the bath composition of 2% by weight is used, if the amount of Si is less than this, the effect of suppressing the interfacial reaction between the plated metal and the base steel is insufficient. In each case, the workability of the product plated steel sheet,
This is because plating adhesion is impaired.
It is not particularly different from that of ordinary hot-dip aluminum plating.
【００１５】次に、スキンパスミルにおけるダルロール
による調質圧延について説明する。溶融アルミニウムめ
っき鋼板のダルロールによる調質圧延において、めっき
層表面に付与される表面粗度は、Ｒｍａｘ（ＪＩＳ Ｂ
０６０１）１５μｍ以下に規制することを要する。これ
は、スキンパスロールのダル面凸部がめっき層を押圧・
圧縮することに起因する前述の不具合（Ｓｉリッチ相の
結晶片同士の接触頻度の増大とそれに伴う素地鋼の早期
腐食の発生）を抑制防止するためである。このめっき層
表面の粗度は、スキンパスロールとして使用するダルロ
ールの表面粗度を適宜選択することにより容易に調整さ
れる。Next, temper rolling by dull roll in a skin pass mill will be described. In the temper rolling of a hot-dip aluminum-plated steel sheet by dull roll, the surface roughness imparted to the plating layer surface is determined by Rmax (JIS B
0601) It is necessary to restrict the thickness to 15 μm or less. This is because the dull surface of the skin pass roll presses the plating layer.
This is in order to prevent the above-mentioned problems (increase in the frequency of contact between crystal pieces of the Si-rich phase and the accompanying occurrence of early corrosion of the base steel) caused by compression. The roughness of the plating layer surface can be easily adjusted by appropriately selecting the surface roughness of a dull roll used as a skin pass roll.
【００１６】図２は、調質圧延を経て得られた溶融アル
ミニウムめっき鋼板について、めっき層のＡｌリッチ相
の大きさ(Ｓ)を制御するための冷却速度および調質圧延
で付与されるめっき層の表面粗度と、耐食性（塩水噴霧
試験）との関係を示している（供試材の詳細は後述）。
図示のように、めっき金属の冷却速度１０℃／ｓｅｃ以
上（＝Ａｌリッチ相の大きさ(Ｓ)２５μｍ以下）および
表面粗度（Ｒｍａｘ）１５μｍ以下、に制御されること
により、良好な耐食性が確保されている。FIG. 2 shows a cooling rate for controlling the size (S) of the Al-rich phase of the coating layer and a coating layer provided by the temper rolling on the hot-dip aluminum plated steel sheet obtained through the temper rolling. Shows the relationship between the surface roughness of the sample and the corrosion resistance (salt spray test) (details of the test materials will be described later).
As shown in the figure, by controlling the cooling rate of the plated metal to 10 ° C./sec or more (= Al-rich phase size (S) 25 μm or less) and surface roughness (Rmax) 15 μm or less, good corrosion resistance is obtained. Is secured.
【００１７】[0017]
【実施例】連続溶融アルミニウムめっきラインにおい
て、Ａｌ−Ｓｉ合金めっき浴に鋼板を導通し、めっき浴
上でめっき付着量を調整すると共に、冷却処理を施して
溶融アルミニウム鋼板を得、ついでダルロールによる調
質圧延を行って供試めっき鋼板を得る。各供試めっき鋼
板から試験片を切り出し塩水噴霧試験（ＪＩＳ Ｚ２３
７１）に付して耐食性を評価した。 ［塩水噴霧試験］ 試験液：塩濃度５±０．５％，ｐＨ６．５〜７．２，液
温 ３５±２℃ 噴霧時間：２４０ＨｒEXAMPLE In a continuous hot-dip aluminum plating line, a steel sheet was conducted to an Al-Si alloy plating bath, the amount of plating was adjusted on the plating bath, and a cooling treatment was performed to obtain a hot-dip aluminum sheet. Rolling is performed to obtain a test plated steel sheet. A test piece is cut out from each test plated steel sheet and subjected to a salt spray test (JIS Z23).
71) to evaluate the corrosion resistance. [Salt spray test] Test solution: salt concentration 5 ± 0.5%, pH 6.5 to 7.2, liquid temperature 35 ± 2 ° C. Spray time: 240 hr
【００１８】表１に、各供試めっき鋼板の製造条件およ
び耐食性評価結果を示す。図２は、表１に示した各供試
めっき鋼板の耐食性と、冷却速度（℃／ｓｅｃ）および
表面粗度（μｍＲｍａｘ）と耐食性評価との関係を示し
ている。表中、「耐食性」欄の記号は次のとおりであ
る。 〇…発錆なし ×…赤錆（素地鋼腐食）発生または白錆（めっき層腐
食）顕著に発生Table 1 shows the production conditions and the corrosion resistance evaluation results of each test plated steel sheet. FIG. 2 shows the relationship between the corrosion resistance of each of the test plated steel sheets shown in Table 1, the cooling rate (° C./sec), the surface roughness (μmRmax), and the corrosion resistance evaluation. In the table, the symbols in the “corrosion resistance” column are as follows. 〇: No rust ×: Red rust (base steel corrosion) or white rust (plating layer corrosion) remarkably generated
【００１９】発明例のものは、溶融めっきにおける急速
冷却処理と調質圧延表面粗度の調整効果により、いずれ
も発錆はなく良好な耐食性を有している。All of the examples of the invention are free from rust and have good corrosion resistance due to the rapid cooling treatment in hot-dip plating and the effect of adjusting the surface roughness of the temper rolling.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【発明の効果】本発明の溶融アルミニウム鋼板は、めっ
き層の金属組織および表面粗度の調整効果として良好な
耐食性を有し、製品間のバラツキが少なく品質の信頼性
にすぐれている。また、安定した耐食性を維持しつつ表
面肌品質に対する要請に応えることができる。本発明に
よる安定した耐食性は、溶融めっき直後の冷却速度とス
キンパスロールの表面粗度の選択により確保されるの
で、コスト増加や工程の煩瑣化等はなく、既設の設備で
容易に実施することができ、実用性にすぐれている。The molten aluminum steel sheet of the present invention has good corrosion resistance as an effect of adjusting the metallographic structure and surface roughness of the plating layer, has little variation among products, and has excellent quality reliability. In addition, it is possible to meet the demand for surface skin quality while maintaining stable corrosion resistance. The stable corrosion resistance according to the present invention is ensured by the selection of the cooling rate immediately after hot-dip plating and the surface roughness of the skin pass roll, so that there is no increase in cost or complicated steps, and it can be easily carried out with existing equipment. It is good and practical.
【図１】鋼板表面の溶融アルミニウムめっき金属の冷却
速度とめっき層のＡｌリッチ母相の大きさ(Ｓ)との関係
を示すグラフである。FIG. 1 is a graph showing the relationship between the cooling rate of a hot-dip aluminized metal on a steel sheet surface and the size (S) of an Al-rich matrix in a plating layer.
【図２】溶融アルミニウムめっき鋼板の塩水噴霧試験に
よる耐食性の評価と、めっき層のＡｌリッチ母相の大き
さ(Ｓ)およびめっき層の表面粗度(Ｒｍａｘ)との関係を
示すグラフである。FIG. 2 is a graph showing the relationship between the evaluation of corrosion resistance of a hot-dip aluminum-plated steel sheet by a salt spray test, the size (S) of an Al-rich matrix in a plating layer, and the surface roughness (Rmax) of the plating layer.
【図３】溶融アルミニウムめっき鋼板の断面説明図であ
る。FIG. 3 is an explanatory cross-sectional view of a hot-dip aluminum-plated steel sheet.
【図４】ダルロールによる調質圧延を施された溶融アル
ミニウムめっき鋼板のめっき層を示す断面説明図であ
る。FIG. 4 is an explanatory cross-sectional view showing a plating layer of a hot-dip aluminum-plated steel sheet subjected to temper rolling by dull rolls.
【図５】溶融アルミニウムめっき層のＡｌリッチ相の大
きさ(Ｓ)の説明図である。FIG. 5 is an explanatory diagram of a size (S) of an Al-rich phase of a hot-dip aluminum plating layer.
【図６】連続溶融アルミニウムめっきラインを模式的に
示す図である。FIG. 6 is a view schematically showing a continuous hot-dip aluminum plating line.
１：めっき層 １１：Ａｌリッチ相（母相） １２：Ｓｉリッチ相 １３：調質圧延で形成されためっき層表面の凹部 ２：金属間化合物層 ３：素地鋼 １０：鋼板 １１：溶融めっき浴 １２：めっき付着量制御装置 １３：冷却装置1: Plating layer 1 1: Al-rich phase (mother phase) 1 2: Si rich phase 1 3: the temper rolling in the formed plated layer surface recess 2: intermetallic compound layer 3: Raw material Steel 10: Sheet 11: Hot-dip plating bath 12: Coating weight control device 13: Cooling device
Claims (2)
ッチの母相中に、Ｓｉリッチ相が分散生成した金属組織
を有するめっき層における、前記Ａｌリッチ相の大きさ
（Ｓ）が２５μｍ以下であり、ダルロールによるスキン
パスで付与されためっき層の表面粗度(Ｒｍａｘ)が１５
μｍ以下である耐食性に優れた溶融アルミニウムめっき
鋼板。The size (S) of the Al-rich phase in a plating layer having a metal structure in which a Si-rich phase is dispersed and generated in an Al-rich matrix with an Si content of 6 to 12% by weight is 25 μm or less, and the surface roughness (Rmax) of the plating layer applied by skin pass with a dull roll is 15 μm.
Hot-dip aluminized steel sheet with excellent corrosion resistance of less than μm.
いて、Ｓｉ含有量６〜１２重量％のＡｌ−Ｓｉ合金めっ
き浴中に鋼板を導入し、めっき浴上で冷却速度１０℃／
秒以上の急速冷却を施してめっき層を形成した後、ダル
ロールを用いたスキンパスミルによる調質圧延におい
て、めっき層に付与される表面粗度を、Ｒｍａｘ１５μ
ｍ以下とすることからなる耐食性に優れた溶融アルミニ
ウムめっき鋼板の製造方法。2. In a continuous hot-dip aluminum plating line, a steel sheet is introduced into an Al—Si alloy plating bath having a Si content of 6 to 12% by weight, and a cooling rate of 10 ° C. /
After forming a plating layer by performing rapid cooling for at least 2 seconds, the surface roughness imparted to the plating layer in the temper rolling by a skin pass mill using a dull roll is set to Rmax 15 μm.
m and a method for producing a hot-dip aluminum-coated steel sheet having excellent corrosion resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04970199A JP3658723B2 (en) | 1999-02-26 | 1999-02-26 | Method for producing hot-dip aluminized steel sheet with excellent corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04970199A JP3658723B2 (en) | 1999-02-26 | 1999-02-26 | Method for producing hot-dip aluminized steel sheet with excellent corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000248349A true JP2000248349A (en) | 2000-09-12 |
| JP3658723B2 JP3658723B2 (en) | 2005-06-08 |
Family
ID=12838501
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04970199A Expired - Lifetime JP3658723B2 (en) | 1999-02-26 | 1999-02-26 | Method for producing hot-dip aluminized steel sheet with excellent corrosion resistance |
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| Country | Link |
|---|---|
| JP (1) | JP3658723B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017179513A (en) * | 2016-03-31 | 2017-10-05 | 日新製鋼株式会社 | Molten aluminum plating steel wire, and method of manufacturing the same |
| KR102058717B1 (en) * | 2018-05-08 | 2019-12-23 | 포스코강판 주식회사 | Hot dip aluminum plated steel sheet for preventing the formation of surface spangle |
| US11167527B2 (en) | 2016-12-23 | 2021-11-09 | Posco | Aluminum-based plated steel having excellent corrosion resistance, aluminum-based alloy plated steel using the same, and method of manufacturing thereof |
-
1999
- 1999-02-26 JP JP04970199A patent/JP3658723B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017179513A (en) * | 2016-03-31 | 2017-10-05 | 日新製鋼株式会社 | Molten aluminum plating steel wire, and method of manufacturing the same |
| US11167527B2 (en) | 2016-12-23 | 2021-11-09 | Posco | Aluminum-based plated steel having excellent corrosion resistance, aluminum-based alloy plated steel using the same, and method of manufacturing thereof |
| US11654654B2 (en) | 2016-12-23 | 2023-05-23 | Posco Co., Ltd | Manufacturing method of aluminum-based alloy plated steel |
| US11904572B2 (en) | 2016-12-23 | 2024-02-20 | Posco Co., Ltd | Manufacturing method of aluminum-based alloy plated steel |
| KR102058717B1 (en) * | 2018-05-08 | 2019-12-23 | 포스코강판 주식회사 | Hot dip aluminum plated steel sheet for preventing the formation of surface spangle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3658723B2 (en) | 2005-06-08 |
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