JPH09209109A - Microspangle hot-dip zinc-aluminium base alloy plated steel sheet and its production - Google Patents
Microspangle hot-dip zinc-aluminium base alloy plated steel sheet and its productionInfo
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- JPH09209109A JPH09209109A JP2278696A JP2278696A JPH09209109A JP H09209109 A JPH09209109 A JP H09209109A JP 2278696 A JP2278696 A JP 2278696A JP 2278696 A JP2278696 A JP 2278696A JP H09209109 A JPH09209109 A JP H09209109A
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- hot
- steel sheet
- plating
- alloy
- dip
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、建材、家電、自動
車等に使用するのに適した、微小スパングル模様の意匠
性に優れた溶融Zn−Al系合金めっき鋼板およびその製造
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip Zn-Al alloy-plated steel sheet which is suitable for use in building materials, home appliances, automobiles, etc. and has a fine spangled pattern, and a manufacturing method thereof.
【０００２】[0002]
【従来の技術】溶融Zn−Al系合金めっきは、鋼板の耐食
性と耐候性を改善するために被覆されるものであるが、
近年その適用量が増大している。代表的なものに、溶融
亜鉛めっき (Al＜0.2%) 、Zn−５％Al合金めっき、Zn−
55％Al合金めっき等がある。2. Description of the Related Art Hot-dip Zn-Al alloy plating is coated in order to improve the corrosion resistance and weather resistance of steel sheets.
In recent years, its application amount has been increasing. Typical ones are hot dip galvanized (Al <0.2%), Zn-5% Al alloy plating, Zn-
55% Al alloy plating etc.
【０００３】中でも、Zn−55％Al合金めっき鋼板は、ア
ルミニウムのもつ耐久性、耐熱性、熱反射性と、亜鉛の
もつ犠牲防食性とを併せもった高性能のめっき鋼板とし
て、建材、家電、自動車部品などに広く使用されてい
る。このめっき鋼板は、代表的には、重量％でAl：55
％、Zn：43.4％、Si：1.6 ％からなる溶融めっき浴を用
いて製造される。AlとZnの割合は耐食性を考慮して決定
され、Siは、めっき密着性を阻害する鋼素地との合金反
応を抑制するために添加される。Among them, the Zn-55% Al alloy plated steel sheet is a high-performance plated steel sheet which has the durability, heat resistance and heat reflectivity of aluminum and the sacrificial corrosion resistance of zinc, and is used as a building material or a home appliance. Widely used for automobile parts. This plated steel sheet typically has a weight percentage of Al: 55.
%, Zn: 43.4%, Si: 1.6%. The ratio of Al and Zn is determined in consideration of the corrosion resistance, and Si is added to suppress the alloy reaction with the steel base that hinders the plating adhesion.
【０００４】このZn−55％Al合金めっき鋼板は、Al含有
率が少ない他のZn−Al合金めっき鋼板とは異なり、めっ
き表面が特徴的な銀白色のスパングル模様を呈し、その
意匠性から生地のままで、商工業用および一般用建造物
の屋根・壁等、或いは器物などに広く利用されている。This Zn-55% Al alloy-plated steel sheet, unlike other Zn-Al alloy-plated steel sheets having a low Al content, exhibits a silver-white spangled pattern with a characteristic plated surface, and due to its design, it is a material. As it is, it is widely used for roofs, walls, etc. of commercial and general-purpose buildings, and articles.
【０００５】Zn−55％Al合金めっき鋼板のめっき表面の
スパングルの粒径は、溶融めっき条件、特に溶融めっき
後の凝固速度に応じて変動するが、一般に平均で約0.8
mm以上であり、目視でスパングル模様を識別することが
できる。しかし、用途によっては、スパングル模様が目
視で識別できない、即ち、平均スパングル粒径が0.7mm
以下の微小スパングル（ミニマムスパングルまたはゼロ
スパングル) が好まれる場合がある。The particle size of spangles on the plated surface of a Zn-55% Al alloy-plated steel sheet varies depending on the hot dip plating conditions, especially the solidification rate after hot dip plating, but is generally about 0.8 on average.
Since it is at least mm, the spangle pattern can be visually identified. However, depending on the application, the spangle pattern cannot be visually identified, that is, the average spangle particle size is 0.7 mm.
The following small spangles (minimum spangle or zero spangle) may be preferred.
【０００６】一般に溶融めっき鋼板のスパングル粒径
は、溶融めっき後の強制冷却時の風量を増大させて、冷
却速度 (従って、めっき皮膜の凝固速度) を高めると小
さくなることが知られている。しかし、このようにめっ
き後に急冷しても、Zn−55％Al合金めっき鋼板の平均ス
パングル粒径を安定して0.8 mmより小さくすることは困
難であった。しかも、急冷により、めっき皮膜中の残留
応力が増加し、めっき皮膜が脆くなり、その加工性が低
下する上、母材鋼板自体にも、急冷により硬化や時効劣
化の増大などが起きて、成形性、加工性が悪影響を受け
る。[0006] It is generally known that the spangle particle size of a hot dip plated steel sheet becomes smaller when the air flow rate during forced cooling after hot dip coating is increased to increase the cooling rate (thus, the solidification rate of the plating film). However, it was difficult to stably reduce the average spangle particle size of the Zn-55% Al alloy-plated steel sheet to less than 0.8 mm even after rapid cooling after plating. Moreover, the rapid cooling increases the residual stress in the plating film, making the plating film brittle and reducing its workability.In addition, the base steel sheet itself also undergoes hardening and aging deterioration due to rapid cooling, and And workability are adversely affected.
【０００７】溶融めっき鋼板のスパングルに関しては、
めっき皮膜が凝固した後スキンパス圧下を行ってスパン
グル模様を消去することも行われてきたが、この方法だ
けでスパングルを消去しようとすると、スパングル残り
による外観劣化、塗装後の外観むらを生じ易い。また、
めっき皮膜がスキンパスロールにピックアップされるこ
とによる疵発生が起こり易い、ユーザーにおけるプレス
加工時にスパングル模様が浮き出やすい、といった問題
もある。Regarding the spangle of hot dip plated steel sheet,
It has been practiced to remove the spangle pattern by performing skin pass reduction after the plating film is solidified. However, if the spangle is erased only by this method, the appearance deterioration due to the spangle residue and the uneven appearance after coating are likely to occur. Also,
There are also problems that defects are likely to occur due to the plating film being picked up by a skin pass roll, and that a spangle pattern is likely to emerge during press working by the user.
【０００８】さらに、溶融めっき鋼板のめっき直後の未
凝固のめっき面に、固体または液体の微粒子を吹付け
て、多数の凝固核を均一に発生させると共に急冷するこ
とにより、スパングルを微細化する技術も種々提案され
ている (溶融アルミニウムめっき鋼板については、例え
ば、特開昭50−38638 号公報、特開昭63−143249号公
報、特開昭63−153255号公報などを参照) 。[0008] Further, a technique for spraying solid or liquid fine particles onto the unsolidified plated surface of the hot dip plated steel sheet immediately after plating to uniformly generate a large number of solidified nuclei and quenching the spangles, thereby miniaturizing the spangle. Various proposals have been made (refer to, for example, JP-A-50-38638, JP-A-63-143249, JP-A-63-153255, etc. for hot dip aluminum plated steel sheet).
【０００９】この方法を採用すれば、Zn−55％Al合金め
っき鋼板のめっき表面の平均スパングル粒径を0.8 mmよ
り小さくすることは可能であるが、急冷に伴う前述した
めっき皮膜の脆化や母材自体の時効劣化等の問題は依然
として解決され得ない。また、この方法は慣用の溶融め
っき設備に微粒子の吹付け装置を付加する必要があり、
コスト高になる。If this method is adopted, it is possible to reduce the average spangle particle diameter on the plating surface of the Zn-55% Al alloy-plated steel sheet to less than 0.8 mm, but the above-mentioned embrittlement of the plating film due to quenching and Problems such as aging deterioration of the base material itself cannot be solved yet. In addition, this method requires the addition of a fine particle spraying device to the conventional hot dip plating equipment,
High cost.
【００１０】特開昭59−56570 号公報には、めっき浴中
にSi：３〜15wt％と共にMg：３〜20wt％を添加すること
からなる、スパングルが非常に微細で耐食性に優れた溶
融Zn−Al合金めっき鋼板が記載されている。しかし、比
較的多量のSiとMgがめっき皮膜中に共存するため、この
めっき鋼板には皮膜中のSiおよびMgの析出による加工性
の劣化という問題がある。JP-A-59-56570 discloses a molten Zn having very fine spangles and excellent corrosion resistance, which comprises adding 3 to 15 wt% of Si and 3 to 20 wt% of Mg in a plating bath. -Al alloy plated steel sheet is described. However, since a relatively large amount of Si and Mg coexist in the plating film, this plated steel sheet has a problem that workability deteriorates due to precipitation of Si and Mg in the coating film.
【００１１】[0011]
【発明が解決しようとする課題】本発明の目的は、めっ
き皮膜中にMgのような他元素を存在させずに、成形性や
加工性が良好で、微細なスパングルを持った意匠性に優
れた溶融Zn−Al合金めっき鋼板を提供することである。The object of the present invention is to provide good formability and workability without the presence of other elements such as Mg in the plating film, and excellent designability with fine spangles. Another object is to provide a hot-dip Zn-Al alloy plated steel sheet.
【００１２】本発明の別の目的は、めっき皮膜や鋼板の
成形性や加工性を損ない、現状の溶融めっき設備の変更
が必要となる微粒子の吹付けを行わずに、Alキルド冷延
鋼板上に微細なスパングルを持った溶融Zn−Al合金めっ
き皮膜を形成することができる、溶融Zn−Al合金めっき
鋼板の製造方法を提供することである。Another object of the present invention is to coat an Al-killed cold-rolled steel sheet on an Al-killed cold-rolled steel sheet without spraying fine particles which impairs the formability and workability of the coating film and the steel sheet and requires a change in the current hot dip coating equipment. It is to provide a method for producing a hot-dip Zn-Al alloy-plated steel sheet capable of forming a hot-dip Zn-Al alloy-plated film having extremely fine spangles.
【００１３】[0013]
【課題を解決するための手段】溶融Zn−Al合金めっき鋼
板は、溶融亜鉛めっきに使用されるような慣用の連続溶
融めっき設備により一般に製造される。代表的な連続溶
融めっき設備では、連続焼鈍炉で焼鈍した母材鋼板 (冷
延鋼板または熱延鋼板) を、スナウトを経て大気に触れ
ることなく溶融めっき浴中に浸漬し、めっき浴から出た
直後にガスワイピングにて所望のめっき付着量に制御
し、冷却ゾーン (通常、空冷) で凝固が完了する温度
(Zn−55％Al合金めっきでは約370 ℃) 以下まで冷却し
た後、必要によりレベラーまたはスキンパスロールで軽
く圧下して巻き取る。The hot-dip Zn-Al alloy plated steel sheet is generally manufactured by a conventional continuous hot-dip galvanizing equipment such as used for hot-dip galvanizing. In a typical continuous hot dip coating facility, a base material steel sheet (cold rolled steel sheet or hot rolled steel sheet) annealed in a continuous annealing furnace is immersed in a hot dip bath through a snout without touching the atmosphere, and then exits from the plating bath. Immediately after that, the temperature is controlled by gas wiping to the desired coating weight, and the temperature at which solidification is completed in the cooling zone (usually air cooling)
After cooling to below 370 ° C for Zn-55% Al alloy plating, if necessary, lightly press down with a leveler or skin pass roll and wind.
【００１４】本発明者らは、このような従来のめっき設
備をそのまま利用して溶融Zn−Al合金めっき皮膜のスパ
ングルを微細化する手段について鋭意検討した結果、Al
キルド鋼を特定の条件下で熱間圧延および冷間圧延した
後、得られた冷延鋼板を母材として、特定条件下で連続
焼鈍し、次いでSi含有量を抑えたAl−Zn合金溶融浴中で
溶融めっきを行うことにより、平均スパングル粒径が0.
7 mm以下の微細なスパングルを持っためっき皮膜を形成
することができることを見出した。The inventors of the present invention have diligently studied a means for refining the spangle of the molten Zn-Al alloy plating film by using such conventional plating equipment as it is.
After hot-rolling and cold-rolling the killed steel under specific conditions, the obtained cold-rolled steel sheet is used as a base material, continuously annealed under specific conditions, and then an Al-Zn alloy molten bath in which the Si content is suppressed. By performing hot dip plating in the medium, the average spangle particle size is 0.
It was found that a plating film having a fine spangle of 7 mm or less can be formed.
【００１５】ここに、本発明は、Al：40〜70wt％および
Si： 0.5〜1.5 wt％を含有し、めっき表面の平均スパン
グル粒径が0.7 mm以下のZn−Al系合金めっき皮膜を有す
る、溶融Zn−Al系合金めっき鋼板である。In the present invention, Al: 40 to 70 wt% and
It is a hot-dip Zn-Al alloy-plated steel sheet containing Si: 0.5 to 1.5 wt% and having a Zn-Al alloy plating film having an average spangle particle diameter of 0.7 mm or less on the plating surface.
【００１６】上記の溶融Zn−Al合金めっき鋼板は、それ
ぞれ低炭素または極低炭素Alキルド鋼スラブから、下記
またはの方法により製造することができる。 Ｃ：0.02〜0.08wt％の低炭素Alキルド鋼スラブを、仕
上げ温度840 ℃以上、880 ℃以下で熱間圧延し、550 ℃
以下で巻取った後、70％以上の冷間圧延率で冷間圧延
し、連続焼鈍により650 ℃以上750 ℃以下で再結晶させ
た冷延鋼板を、Al：40〜70wt％およびSi： 0.5〜1.5 wt
％を含有するAl−Zn系合金溶融浴中でめっきを行うこと
を特徴とする、平均スパングル粒径が0.7 mm以下のめっ
き表面を有する溶融Zn−Al系合金めっき鋼板の製造方
法。The above-mentioned hot dip Zn-Al alloy-plated steel sheet can be produced from a low carbon or ultra low carbon Al killed steel slab by the following method. C: 0.02-0.08 wt% low carbon Al killed steel slab is hot-rolled at a finishing temperature of 840 ° C or higher and 880 ° C or lower, and 550 ° C.
After being rolled up below, cold-rolled at a cold rolling rate of 70% or more and recrystallized by continuous annealing at 650 ° C or higher and 750 ° C or lower, cold rolled steel sheet is Al: 40-70 wt% and Si: 0.5 ~ 1.5 wt
% Of the Al-Zn alloy is used for plating, and a method for producing a hot-dip Zn-Al alloy-plated steel sheet having a plating surface with an average spangle grain size of 0.7 mm or less.
【００１７】Ｃ：0.006 wt％以下の極低炭素Alキルド
鋼スラブを、仕上げ温度860 ℃以上、900 ℃以下で熱間
圧延し、550 ℃以下で巻取った後、70％以上の冷間圧延
率で冷間圧延し、連続焼鈍により750 ℃以上850 ℃以下
で再結晶させた冷延鋼板を、Al：40〜70wt％およびSi：
0.5〜1.5 wt％を含有するAl−Zn系合金溶融浴中でめっ
きを行うことを特徴とする、平均スパングル粒径が0.7
mm以下のめっき表面を有する溶融Zn−Al系合金めっき鋼
板の製造方法。C: 0.006 wt% or less of an extremely low carbon Al killed steel slab is hot-rolled at a finishing temperature of 860 ° C or more and 900 ° C or less, wound at 550 ° C or less, and then cold rolled to 70% or more. Cold-rolled steel sheet cold-rolled at a constant rate and recrystallized by continuous annealing at a temperature of 750 ° C to 850 ° C, Al: 40-70 wt% and Si:
An average spangle particle size of 0.7 is characterized by plating in an Al-Zn alloy molten bath containing 0.5 to 1.5 wt%.
A method for manufacturing a hot-dip Zn-Al alloy-plated steel sheet having a plating surface of not more than mm.
【００１８】上記Zn−Al系合金めっき皮膜およびZn−Al
合金溶融浴は、めっき皮膜の加工性の一層の向上を目的
として、Zr、Hf、Ｖの１種もしくは２種以上を各0.01〜
0.4wt％、および／またはTiを0.40wt％以下、さらに含
有していてもよい。The above-mentioned Zn-Al alloy plating film and Zn-Al
For the purpose of further improving the workability of the plating film, the alloy melting bath contains one or more of Zr, Hf, and V of 0.01 to 200% each.
It may further contain 0.4 wt% and / or Ti of 0.40 wt% or less.
【００１９】[0019]
【発明の実施の形態】以下、本発明について詳細に説明
する。なお、以下の説明においては、％は特に指定のな
い限りwt％である。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. In the following description,% is wt% unless otherwise specified.
【００２０】(めっき皮膜および浴組成)めっき浴組成を
Al：40〜70％およびSi： 0.5〜1.5 ％とする。所望によ
り、めっき浴中にさらに、Zr、Hf、Ｖの１種もしくは２
種以上：合計で0.01〜0.4 ％、および／またはTi：0.40
％以下を含有させてもよい。めっき浴の残部は、亜鉛お
よび不可避不純物である。めっき皮膜の組成は、めっき
浴組成と実質的に同一となる。(Plating film and bath composition)
Al: 40-70% and Si: 0.5-1.5%. If desired, one or two of Zr, Hf, and V are added to the plating bath.
Species or higher: 0.01 to 0.4% in total, and / or Ti: 0.40
% Or less may be contained. The balance of the plating bath is zinc and inevitable impurities. The composition of the plating film is substantially the same as the composition of the plating bath.
【００２１】Al：Al含有率は40〜70％、好ましくは50〜
60％とする。Al含有率が40％未満では、浴の溶融温度が
低下し、めっき皮膜の凝固開始温度が500 ℃以下になる
ため、凝固完了までの時間が増大し、スパングル径が大
きくなり、平均で0.7 mm以下のスパングル径とすること
が困難となる。その上、相対的に皮膜中のZn含有率が増
加するため、スパングルを形成するAlデンドライト相が
減少し、スパングル自体が不明瞭になって、本発明で目
的とする微細なスパングルにより与えられる美麗な外
観、即ち、目的とする意匠性が得られなくなる。さら
に、めっき層中のZnリッチ相が増大し、粒界腐食の助長
や選択腐食の促進により、耐食性も劣化する。一方、Al
含有率が70％を超えると、Alリッチ相が増大するため、
Znの犠牲防食性が小さくなり、耐食性が再び低下する。Al: Al content is 40 to 70%, preferably 50 to 70%
60% If the Al content is less than 40%, the melting temperature of the bath will decrease and the solidification start temperature of the plating film will be 500 ° C or less, so the time to complete solidification will increase and the spangle diameter will increase, averaging 0.7 mm. It becomes difficult to set the following spangle diameter. Moreover, since the Zn content in the coating relatively increases, the Al dendrite phase forming the spangle decreases, and the spangle itself becomes unclear, and the beautiful fine spangle intended by the present invention provides The desired appearance cannot be obtained. Further, the Zn-rich phase in the plating layer increases, and the corrosion resistance is deteriorated by promoting intergranular corrosion and promoting selective corrosion. On the other hand, Al
If the content exceeds 70%, the Al-rich phase increases, so
The sacrificial corrosion resistance of Zn is reduced, and the corrosion resistance is reduced again.
【００２２】Si：Siは、めっき皮膜−母材界面に生成す
る脆いFe−Al合金層の発達を抑制するために従来よりZn
−Al合金めっき浴に添加されてきた。前述したように、
Zn−55％Al合金溶融めっきでは、この目的で1.6 ％程度
のSiを含有させるのが普通であった。本発明では、次に
述べる理由により、Si含有率を 0.5〜1.5 ％に抑える。Si: Si has been conventionally used for Zn in order to suppress the development of a brittle Fe-Al alloy layer formed at the plating film-base metal interface.
-Al alloy has been added to the plating bath. As previously mentioned,
In Zn-55% Al alloy hot dip plating, it was usual to contain about 1.6% Si for this purpose. In the present invention, the Si content is suppressed to 0.5 to 1.5% for the following reason.
【００２３】Al含有率が40〜70％のZn−Al合金層の結晶
形態は、等軸晶および柱状晶の混合状態であり、スパン
グル径はAlリッチの一次デンドライト結晶の成長度に関
係する。通常、Alデンドライト結晶は、板面に対して平
行に成長するが、合金層の成長度が増すと、合金層の影
響を受けて板面と垂直方向に成長するようになり、同時
にスパングルの核発生量も増大して、スパングルが微細
化することが判明した。即ち、板面と垂直方向のAlデン
ドライト結晶の成長と核発生量の増大が起こるように、
合金層をある程度成長させる方が、スパングルは微細化
するのである。このように合金層の厚みと形態を制御
し、スパングル径を小さくするために、本発明ではSi含
有率を 0.5〜1.5 ％、好ましくは 0.7 〜1.2 ％とす
る。The crystal morphology of the Zn-Al alloy layer having an Al content of 40 to 70% is a mixed state of equiaxed crystals and columnar crystals, and the spangle diameter is related to the growth degree of Al-rich primary dendrite crystals. Normally, Al dendrite crystal grows parallel to the plate surface, but when the growth rate of the alloy layer increases, it grows in the direction perpendicular to the plate surface under the influence of the alloy layer, and at the same time, spangle cores grow. It was found that the amount of generation also increased and the spangle became finer. That is, the growth of Al dendrite crystals in the direction perpendicular to the plate surface and the increase in the amount of nucleation occur,
The spangle becomes finer when the alloy layer is grown to some extent. Thus, in order to control the thickness and morphology of the alloy layer and reduce the spangle diameter, the Si content is set to 0.5 to 1.5%, preferably 0.7 to 1.2% in the present invention.
【００２４】Si含有率が1.5 ％を超えると、めっき時に
めっき皮膜−母材界面に形成されるFe−Al−Si合金層の
成長が抑制されすぎ、この合金層が薄く均一に成長する
ため、核発生が少なくなる上、めっき皮膜中のAlデンド
ライト結晶が板面と平行方向にのみ成長するようにな
り、スパングル径が増大する。一方、Si含有率が0.5 ％
未満では、Fe−Al−Si合金層が不均一に生成し、さらに
この合金層が成長しすぎて非常に厚くなり、めっき皮膜
の加工性が著しく劣化する。If the Si content exceeds 1.5%, the growth of the Fe-Al-Si alloy layer formed at the plating film-base metal interface during plating is excessively suppressed, and this alloy layer grows thin and uniform. In addition to reducing nucleation, Al dendrite crystals in the plating film grow only in the direction parallel to the plate surface, increasing the spangle diameter. On the other hand, Si content is 0.5%
If the amount is less than this, the Fe-Al-Si alloy layer is nonuniformly formed, and the alloy layer grows too much and becomes very thick, resulting in a marked deterioration in the workability of the plating film.
【００２５】Zr、Hf、Ｖ：これらの元素は、めっき皮膜
の加工性をさらに向上させるために、必要に応じてZn−
Al合金めっき皮膜中に含有させてもよい。加工性の改善
は、添加元素がめっき皮膜中で均一に分散し、皮膜中に
析出するSiを球状化し、加工時のめっき皮膜中の応力集
中を緩和することで達成される。Zr, Hf, V: These elements are added as necessary in order to improve the workability of the plating film.
It may be contained in the Al alloy plating film. The workability is improved by uniformly dispersing the additive element in the plating film, spheroidizing Si precipitated in the film, and relaxing stress concentration in the plating film during processing.
【００２６】これらの元素を添加する場合、それぞれ0.
01〜0.4 ％、好ましくは0.05〜0.2％の範囲の量で含有
させる。その添加量が0.01％以下では、均一分散による
皮膜の均質化の効果が少なく、また0.4 ％超を超える
と、皮膜均質化の効果が飽和するばかりでなく、操業時
のめっき浴からのドロス発生量が増大し、めっき品質と
コストの悪化を招く。When these elements are added, the amount of each element is 0.
It is contained in an amount in the range of 01 to 0.4%, preferably 0.05 to 0.2%. If the addition amount is 0.01% or less, the effect of homogenizing the film by uniform dispersion is small, and if it exceeds 0.4%, not only the effect of homogenizing the film is saturated, but also dross is generated from the plating bath during operation. As a result, the amount of plating increases and the plating quality and cost deteriorate.
【００２７】Ti：Tiはめっき皮膜表面の核発生増大の目
的で、必要に応じてZn−Al合金めっき皮膜中に0.40％以
下の量で含有させることができる。Tiの添加量が0.40％
を超えると、皮膜均質化の効果が飽和するばかりでな
く、操業時のめっき浴からのドロス発生量が増大し、め
っき品質とコストの悪化を招く。Tiを添加させる場合の
好ましい添加量は 0.001〜0.20％である。Ti: Ti may be contained in the Zn-Al alloy plating film in an amount of 0.40% or less, if necessary, for the purpose of increasing nucleation on the surface of the plating film. Addition amount of Ti is 0.40%
If it exceeds, not only the effect of homogenizing the film is saturated, but also the amount of dross generated from the plating bath during operation increases, which causes deterioration of plating quality and cost. When Ti is added, the preferable addition amount is 0.001 to 0.20%.
【００２８】(スパングル径)Al含有率が40〜70％のZn−
Al合金めっき皮膜の表面に現れるスパングルとは、図１
に示すように、核から伸びているAlリッチの一次デンド
ライト結晶 (Al一次デンドライト晶) に囲まれた領域で
ある。従って、この領域の径がスパングル径である。な
お、この一次デンドライト晶から伸びているのが、Al二
次デンドライト晶である。(Spangle diameter) Zn-containing Al content of 40-70%
The spangles appearing on the surface of the Al alloy plating film are shown in Fig. 1.
As shown in, the region is surrounded by Al-rich primary dendrite crystals (Al primary dendrite crystals) extending from the nucleus. Therefore, the diameter of this region is the spangle diameter. Note that the Al secondary dendrite crystals extend from the primary dendrite crystals.
【００２９】本発明におけるスパングル径の測定は、め
っき鋼板の表面拡大写真 (例えば３倍拡大) を用いて、
一定距離 (例えば100 mm) 間のスパングル個数を測定す
ることにより行われ、 [測定距離／スパングル個数] に
より平均スパングル径が算出される。The spangle diameter in the present invention is measured by using an enlarged photograph of the surface of the plated steel sheet (for example, magnified 3 times).
This is done by measuring the number of spangles in a certain distance (for example, 100 mm), and the average spangle diameter is calculated by [measured distance / number of spangles].
【００３０】平均スパングル径が0.7 mmより大きいと、
目視でスパングル模様が識別可能となり、本発明で目的
とする微細なスパングルによる意匠性を得ることができ
ない。一方、平均スパングル径が0.7 mm以下では、目視
でのスパングル模様の識別が困難となり、本発明で目的
とする微細なスパングルからなる美麗なめっき表面を持
った意匠性を得ることができる。If the average spangle diameter is larger than 0.7 mm,
The spangle pattern can be visually identified, and the designability due to the fine spangles, which is the object of the present invention, cannot be obtained. On the other hand, if the average spangle diameter is 0.7 mm or less, it becomes difficult to visually identify the spangle pattern, and it is possible to obtain a design property having a beautiful plated surface made of fine spangle which is the object of the present invention.
【００３１】本発明の方法によれば、Ｃ：0.02〜0.08wt
％の低炭素Alキルド鋼スラブまたはＣ：0.006 wt％以下
の極低炭素Alキルド鋼スラブを素材として、これを特定
の条件下で熱間圧延および冷間圧延した後、得られた冷
延鋼板を母材とし、特定条件下で連続焼鈍し、次いで上
記組成のAl−Zn合金溶融浴中で溶融めっきを行うことに
より、平均スパングル粒径が0.7 mm以下の微細スパング
ルのめっき表面を持った溶融Zn−Al合金めっき鋼板が製
造される。According to the method of the present invention, C: 0.02 to 0.08 wt
% Low carbon Al killed steel slab or C: 0.006 wt% or less ultra low carbon Al killed steel slab as a raw material, which was hot-rolled and cold-rolled under specific conditions As a base material, continuously annealed under specific conditions, and then performing hot dip plating in an Al-Zn alloy dip bath of the above composition, resulting in melting with a fine spangled surface with an average spangle diameter of 0.7 mm or less. A Zn-Al alloy plated steel sheet is manufactured.
【００３２】(熱間圧延の仕上げ温度)熱間圧延の仕上げ
温度が、低炭素Alキルド鋼で840 ℃未満、極低炭素Alキ
ルド鋼で860 ℃未満では、α域圧延になり、結晶粒が粗
大化する結果、細粒を得ることが困難である。また、こ
の仕上げ温度が低炭素Alキルド鋼で880 ℃超、極低炭素
Alキルド鋼で900 ℃超では、γ粒が大きくなり、やはり
結晶粒の細粒を得ることが困難である。(Finishing Temperature of Hot Rolling) When the finishing temperature of hot rolling is less than 840 ° C. for low carbon Al killed steel and less than 860 ° C. for ultra low carbon Al killed steel, α-region rolling occurs and the crystal grains are As a result of coarsening, it is difficult to obtain fine particles. In addition, this finishing temperature is over 880 ° C for low carbon Al killed steel,
Above 900 ° C in Al-killed steel, the γ grains become large and it is also difficult to obtain fine grains.
【００３３】(熱間圧延後の巻取温度)熱間圧延した鋼板
の巻取温度が550 ℃を超えると、低炭素Alキルド鋼と極
低炭素Alキルド鋼のいずれにおいてもα粒が成長し、結
晶粒を細粒とすることが困難である。この巻取温度は好
ましくは 500℃以下とする。(Winding temperature after hot rolling) When the winding temperature of the hot rolled steel sheet exceeds 550 ° C, α grains grow in both the low carbon Al killed steel and the ultra low carbon Al killed steel. However, it is difficult to make the crystal grains fine. The coiling temperature is preferably 500 ° C or lower.
【００３４】(冷間圧延率)熱間圧延後に行う冷間圧延で
の圧延率が70％未満では、再結晶時の核発生量が少ない
ために再結晶粒が大きくなり、細粒を得ることが困難で
ある。好ましい冷間圧延率は75％以上である。(Cold rolling rate) When the rolling rate in cold rolling performed after hot rolling is less than 70%, the amount of nuclei generated during recrystallization is small, so that recrystallized grains become large and fine grains are obtained. Is difficult. A preferable cold rolling rate is 75% or more.
【００３５】(連続焼鈍温度)冷間圧延により得られた冷
延鋼板を母材として、連続焼鈍を行った後、上記組成に
調整した溶融めっき浴に浸漬して溶融Zn−Al合金めっき
を施す。焼鈍雰囲気は、NH3 を熱分解して得られるN2＋
H2の混合ガス雰囲気が好ましい。(Continuous Annealing Temperature) The cold-rolled steel sheet obtained by cold rolling is used as a base material for continuous annealing, followed by immersion in a hot dip bath adjusted to the above composition for hot dip Zn-Al alloy plating. . The annealing atmosphere is N 2 + obtained by thermally decomposing NH 3.
A mixed gas atmosphere of H 2 is preferable.
【００３６】連続焼鈍温度が、低炭素Alキルド鋼で650
℃未満、極低炭素Alキルド鋼で750℃未満では、再結晶
が起こらない。一方で、連続焼鈍温度が低炭素Alキルド
鋼で750 ℃超、極低炭素Alキルド鋼で850 ℃超では、結
晶粒が粗大化し、細粒を得ることが困難となる。好まし
い連続焼鈍温度は、低炭素Alキルド鋼では 650〜720
℃、極低炭素Alキルド鋼では 750〜800 ℃である。The continuous annealing temperature is 650 for low carbon Al killed steel.
Recrystallization does not occur at temperatures below ℃ and below 750 ℃ for ultra-low carbon Al killed steel. On the other hand, if the continuous annealing temperature is higher than 750 ° C for the low carbon Al-killed steel and higher than 850 ° C for the ultra-low carbon killed steel, the crystal grains become coarse and it becomes difficult to obtain fine grains. The preferred continuous annealing temperature is 650-720 for low carbon Al killed steel.
℃, 750-800 ℃ for ultra-low carbon Al killed steel.
【００３７】以上の条件下で熱間圧延、冷間圧延、およ
び溶融めっき前の連続焼鈍を行うと、鋼板の結晶粒が細
粒となり、この上に上記の溶融Zn−Al合金めっきを施し
た際に、母材−めっき界面の粒界が多くなり、さらに上
述のようにめっき浴中のSi濃度を抑制することによっ
て、Alデンドライト晶の板面と垂直方向への成長の促進
（板面と平行方向の成長の抑制）とスパングルの核発生
の促進を図ることにより、0.7 mm以下という小さい平均
スパングル径を確保することが可能となる。When hot rolling, cold rolling, and continuous annealing before hot dip coating were performed under the above conditions, the crystal grains of the steel sheet became fine grains, and the above-mentioned hot dip Zn-Al alloy plating was applied on this. At this time, the number of grain boundaries at the base metal-plating interface increases, and by suppressing the Si concentration in the plating bath as described above, promotion of growth of Al dendrite crystals in the direction perpendicular to the plate surface (plate surface and It is possible to secure a small average spangle diameter of 0.7 mm or less by suppressing growth in the parallel direction) and promoting spangle nucleation.
【００３８】溶融めっき自体は、常法により実施すれば
よく、特に制限されない。Alを40〜70％含有する溶融Zn
−Al合金めっき浴の浴温は普通 530〜600 ℃である。連
続焼鈍した冷延鋼板は、外気に触れないように不活性雰
囲気下に保持されたスナウトを通す間に、この浴温付近
まで冷却され、溶融めっき浴に浸漬される。浴から出た
直後、ガスワイピングノズル等の慣用の付着量制御手段
により、めっき付着量を制御する。付着量は特に制限さ
れないが、通常は片面当たり35〜100 g/m2、好ましくは
45〜90 g/m2 である。溶融めっきは、普通には両面めっ
きであるが、周知の方法を利用して片面めっきとするこ
ともできる。The hot dip plating itself may be carried out by a conventional method and is not particularly limited. Molten Zn containing 40-70% Al
The bath temperature of the Al alloy plating bath is usually 530-600 ° C. The continuously annealed cold-rolled steel sheet is cooled to around the bath temperature while being passed through a snout kept under an inert atmosphere so as not to come into contact with the outside air, and is immersed in a hot dipping bath. Immediately after leaving the bath, the amount of plating deposit is controlled by a conventional amount-of-adhesion control means such as a gas wiping nozzle. The amount of adhesion is not particularly limited, but usually 35 to 100 g / m 2 per side, preferably
45 to 90 g / m 2 . Hot-dip plating is usually double-sided plating, but it is also possible to use single-sided plating by utilizing a well-known method.
【００３９】付着量を制御した後、めっき鋼板を冷却し
て、めっき皮膜を凝固させる。この時の冷却は、通常の
空冷でよく、従来の微細スパングル技術で採用されたよ
うな急冷 (例、送風量の極端な増大、水冷、微粒子の吹
付け等) を行う必要はない。従って、従来の連続溶融め
っき設備を改造する必要がない。通常の空冷でも、熱間
圧延、冷間圧延、めっき前の連続焼鈍の各条件、および
めっき浴組成を上記のように制御すれば、平均スパング
ル径が0.7 mm以下という微細スパングル表面を持った溶
融Zn−Al合金めっき皮膜を得ることができる。After controlling the adhesion amount, the plated steel sheet is cooled to solidify the plating film. The cooling at this time may be ordinary air cooling, and it is not necessary to perform the rapid cooling (eg, extreme increase in air flow, water cooling, spraying of fine particles, etc.) as used in the conventional fine spangle technology. Therefore, it is not necessary to modify the conventional continuous hot-dip plating equipment. Even with normal air cooling, if the conditions of hot rolling, cold rolling, continuous annealing before plating, and the plating bath composition are controlled as described above, melting with a fine spangle surface with an average spangle diameter of 0.7 mm or less A Zn-Al alloy plating film can be obtained.
【００４０】冷却後、必要であれば、前焼鈍や溶融めっ
き中に生じた歪みを除去するために、めっき鋼板をレベ
ラーまたはスキンパスロールで軽く圧下してから巻き取
る。スパングルが粗大であると、この圧下時にスパング
ルが不均一になって外観が劣化し、或いは塗装あとの外
観むらを生ずる原因となっていた。しかし、本発明では
スパングルが微細化されているため、スキンパス圧下を
行っても、このような外観劣化や塗装時の外観むらがほ
とんどみられない。After cooling, if necessary, the plated steel sheet is lightly pressed by a leveler or a skin pass roll to remove strains generated during pre-annealing or hot dipping, and then wound. If the spangles are coarse, the spangles become non-uniform during the reduction and the appearance is deteriorated, or the appearance becomes uneven after painting. However, in the present invention, since the spangles are miniaturized, such appearance deterioration and uneven appearance at the time of coating are hardly seen even when skin pass reduction is performed.
【００４１】[0041]
(実施例１)Ｃ：0.04％の低炭素Alキルド鋼スラブを、表
１に示す仕上げ温度および巻取温度で熱間圧延した後、
同じく表１に示す冷間圧延率で冷間圧延することによ
り、0.8 mm厚の冷延鋼板を得た。(Example 1) C: 0.04% of a low carbon Al killed steel slab was hot-rolled at a finishing temperature and a winding temperature shown in Table 1,
Similarly, cold rolling was performed at the cold rolling rate shown in Table 1 to obtain a cold rolled steel sheet having a thickness of 0.8 mm.
【００４２】この0.8 mm厚の冷延鋼板を、アルカリ脱脂
により表面清浄化した後、N2＋H2ガス雰囲気の焼鈍炉で
表１に示す焼鈍温度において60秒の連続焼鈍を施し、続
いて表１に示した浴組成 (残部：亜鉛および不可避不純
物) の溶融Zn−Al合金めっき浴を用いて両面溶融めっき
を施し、ワイピングノズルで片面当たり80 g/m2 のめっ
き付着量に制御し、通常の空冷（送風量500 Nm3/分）に
より冷却して、溶融Zn−Al合金めっき鋼板を得た。After the surface of the 0.8 mm-thick cold rolled steel sheet was cleaned by alkali degreasing, it was continuously annealed at the annealing temperature shown in Table 1 for 60 seconds in an annealing furnace in an N 2 + H 2 gas atmosphere, and then Double-sided hot-dip plating is performed using a hot-dip Zn-Al alloy plating bath with the bath composition shown in 1 (the balance: zinc and unavoidable impurities), and the wiping nozzle controls the coating weight to 80 g / m 2 per side. was cooled by air cooling (air volume 500 Nm 3 / min), to obtain a molten Zn-Al alloy coated steel sheet.
【００４３】得られた溶融Zn−Al合金めっき鋼板の平均
スパングル径、加工性および耐食性を次のようにして評
価した結果を、総合評価と共に、表１に併せて示す。平均スパングル径 めっき表面の２倍拡大写真を用いて、100 mm長さ当たり
のスパングル個数を測定し、[100／スパングル個数] に
より平均スパングル径 (mm) を算出した。The average spangle diameter, workability, and corrosion resistance of the obtained hot-dip Zn-Al alloy plated steel sheet are evaluated as follows, and the results are shown in Table 1 together with the comprehensive evaluation. Average spangle diameter The number of spangles per 100 mm length was measured using a magnified photograph of the plated surface, and the average spangle diameter (mm) was calculated from [100 / number of spangles].
【００４４】加工性 めっき鋼板の試験片の 180°２Ｔ曲げ試験において、曲
げ部のめっき皮膜の割れ幅および割れ数をＳＥＭ (走査
型電子顕微鏡) で観察し、下記基準により評価した。 ×：割れ大、一部剥離あり、 △：割れ中、剥離なし、 ○：割れ小、剥離なし、 ◎：割れ極少、剥離なし。In the 180 ° 2T bending test of the test piece of the workability plated steel sheet, the crack width and the number of cracks of the plating film at the bent portion were observed by SEM (scanning electron microscope) and evaluated according to the following criteria. ×: Large cracks, some peeling, Δ: Medium cracking, no peeling, ◯: Small cracking, no peeling, ◎: Minimal cracking, no peeling.
【００４５】耐食性 めっき鋼板の試験片の塩水噴霧試験 (JIS Z2371)を2500
時間行った後、赤錆発生面積率を目視判定により求め、
下記基準により評価した。 ×：50％以上の赤錆発生、 △：５〜50％の赤錆発生、 ○：５％以下の赤錆発生、 ◎：赤錆全くなし。A salt spray test (JIS Z2371) of a test piece of a corrosion-resistant plated steel sheet was conducted for 2500
After the time, calculate the red rust occurrence area rate by visual judgment,
The following criteria evaluated. ×: Red rust generation of 50% or more, Δ: Red rust generation of 5 to 50%, ◯: Red rust generation of 5% or less, ◎: No red rust at all.
【００４６】総合評価 ×：２項目以上×のもの、 △：１項目×のもの、 ○：１または２項目が○で、残りが◎のもの、 ◎：すべて◎のもの、 （但し、平均スパングル径0.7 mm以下を◎、0.7 mm超を
×とする）。 Comprehensive evaluation ×: 2 items or more ×, Δ: 1 item ×, ○: 1 or 2 items are ○, the rest are ◎, ◎: All are ◎ (however, average spangle A diameter of 0.7 mm or less is marked with ◎, and a diameter exceeding 0.7 mm is marked with x).
【００４７】[0047]
【表１】 [Table 1]
【００４８】(実施例２)熱間圧延の素材として、Ｃ：0.
004 ％の極低炭素Alキルド鋼スラブを用いた以外は、実
施例１と同様にして熱間圧延、冷間圧延、めっき前の焼
鈍、および溶融Zn−Al合金めっきを行った。熱間圧延の
仕上げおよび巻取り温度、冷間圧延率、焼鈍温度、およ
びめっき浴組成を表２にまとめて示す。得られた溶融Zn
−Al合金めっき鋼板の平均スパングル径、加工性および
耐食性を上記のように評価した結果を総合評価と共に、
表１に併せて示す。(Example 2) As a material for hot rolling, C: 0.
Hot rolling, cold rolling, annealing before plating, and hot dip Zn-Al alloy plating were performed in the same manner as in Example 1 except that a 004% ultra-low carbon Al killed steel slab was used. Table 2 shows the finish and winding temperature of the hot rolling, the cold rolling rate, the annealing temperature, and the composition of the plating bath. Obtained molten Zn
With the overall evaluation of the average spangle diameter of the Al alloy plated steel sheet, the workability and the corrosion resistance as described above,
It is also shown in Table 1.
【００４９】[0049]
【表２】 [Table 2]
【００５０】表１および表２からわかるように、本発明
に従って溶融Zn−Al合金めっき鋼板を製造すると、平均
スパングル径が0.7 mm以下で、加工性や耐食性も良好で
あった。これに対し、めっき浴 (めっき皮膜) 中のAl含
有率が40％未満であるか、Si含有率が1.5 ％を超える
と、平均スパングル径は1.0 mmを超え、スパングルが著
しく粗大となった。Al含有率が30〜70％の範囲外、また
はSi含有率が0.5 ％未満では、加工性や耐食性が著しく
劣化した。また、めっき皮膜中の任意添加元素の添加量
が上限を超えたり、或いは各工程の条件が本発明の範囲
外では、いずれも鋼板の細粒化が不十分で、平均スパン
グル径を0.7 mm以下まで微細化することができず、また
加工性や耐食性も著しく或いはやや劣化した。As can be seen from Tables 1 and 2, when the hot-dip Zn-Al alloy-plated steel sheet was produced according to the present invention, the average spangle diameter was 0.7 mm or less, and the workability and corrosion resistance were good. On the other hand, when the Al content in the plating bath (plating film) was less than 40% or the Si content exceeded 1.5%, the average spangle diameter exceeded 1.0 mm, and the spangle became extremely coarse. When the Al content was out of the range of 30 to 70% or the Si content was less than 0.5%, workability and corrosion resistance were significantly deteriorated. Further, if the addition amount of the optional additive element in the plating film exceeds the upper limit, or the conditions of each step are outside the scope of the present invention, the grain refinement of the steel sheet is insufficient, and the average spangle diameter is 0.7 mm or less. However, the workability and corrosion resistance were significantly or slightly deteriorated.
【００５１】[0051]
【発明の効果】本発明により、従来の連続溶融めっき設
備を改造せずにそのまま利用して、加工性や耐食性を劣
化させることなく、ミニマムスパングル化された、意匠
性に優れた溶融Zn−Al合金めっき鋼板を得ることが可能
となる。EFFECTS OF THE INVENTION According to the present invention, the conventional continuous hot dip galvanizing equipment is used as it is without modification, and the minimum spangled Zn-Al excellent in designability is obtained without deteriorating the workability and corrosion resistance. It is possible to obtain an alloy-plated steel sheet.
【００５２】このめっき鋼板は、Zn−55％Al合金めっき
鋼板で代表される優れた耐食性と、過酷な曲げ加工に耐
える良好な加工性とを有しており、しかも目視で判別で
きない微細スパングルからなる意匠性の高い外観を有す
るため、塗装せずに生地のまま、建材、家電製品、その
他の器物などに使用できる。また、スパングルが微細で
あるため、塗装を施した後の外観むらが少ないので、自
動車車体のように塗装用途にも使用でき、それにより従
来の亜鉛めっき鋼板に比べてさらに高い耐食性を自動車
車体に付与することができる。This plated steel sheet has excellent corrosion resistance typified by a Zn-55% Al alloy plated steel sheet and good workability to withstand severe bending, and moreover, from a fine spangle that cannot be visually discerned. Since it has a highly-designed appearance, it can be used for building materials, home appliances, other articles, etc. as it is without being painted. In addition, since the spangles are fine, there is little unevenness in appearance after painting, so it can be used for painting applications like automobile bodies, and as a result, it has higher corrosion resistance than conventional galvanized steel sheets. Can be granted.
【図１】溶融Zn−Al合金めっき鋼板のスパングル (Al一
次デンドライト晶) を示す説明図である。FIG. 1 is an explanatory view showing spangles (Al primary dendrite crystals) of a hot dip Zn-Al alloy plated steel sheet.
Claims (5)
を含有し、めっき表面の平均スパングル粒径が0.7 mm以
下のZn−Al系合金めっき皮膜を有する、溶融Zn−Al系合
金めっき鋼板。1. Al: 40-70 wt% and Si: 0.5-1.5 wt%
And a hot-dip Zn-Al alloy-plated steel sheet having a Zn-Al alloy-plated film having an average spangle particle diameter of 0.7 mm or less on the plating surface.
Zr、Hf、Ｖの１種もしくは２種以上を各0.01〜0.4 wt
％、および／またはTiを0.40wt％以下含有する、請求項
１記載の溶融Zn−Al系合金めっき鋼板。2. The Zn-Al alloy plating film further comprises:
0.01 to 0.4 wt each of one or more of Zr, Hf and V
% And / or Ti in an amount of 0.40 wt% or less, the hot dip Zn-Al alloy plated steel sheet according to claim 1.
スラブを、仕上げ温度840 ℃以上880 ℃以下で熱間圧延
し、550 ℃以下で巻取った後、70％以上の冷間圧延率で
冷間圧延し、連続焼鈍により650 ℃以上750 ℃以下で再
結晶させた冷延鋼板を、Al：40〜70wt％およびSi： 0.5
〜1.5 wt％を含有するAl−Zn系合金溶融浴中でめっきを
行うことを特徴とする、平均スパングル粒径が0.7 mm以
下のめっき表面を有する溶融Zn−Al系合金めっき鋼板の
製造方法。3. A C: 0.02-0.08 wt% low carbon Al killed steel slab is hot-rolled at a finishing temperature of 840 ° C. or higher and 880 ° C. or lower, wound at 550 ° C. or lower, and then cold rolled to 70% or more. Cold rolled steel sheet cold-rolled at a rolling rate and recrystallized by continuous annealing at 650 ℃ or more and 750 ℃ or less, Al: 40 ~ 70 wt% and Si: 0.5
A method for producing a hot-dip Zn-Al alloy-plated steel sheet having a plating surface having an average spangle particle size of 0.7 mm or less, characterized by plating in an Al-Zn-based alloy molten bath containing ~ 1.5 wt%.
鋼スラブを、仕上げ温度860 ℃以上900 ℃以下で熱間圧
延し、550 ℃以下で巻取った後、70％以上の冷間圧延率
で冷間圧延し、連続焼鈍により750 ℃以上850 ℃以下で
再結晶させた冷延鋼板を、Al：40〜70wt％およびSi：
0.5〜1.5 wt％を含有するAl−Zn系合金溶融浴中でめっ
きを行うことを特徴とする、平均スパングル粒径が0.7
mm以下のめっき表面を有する溶融Zn−Al系合金めっき鋼
板の製造方法。4. C: 0.006 wt% or less of an extremely low carbon Al killed steel slab is hot-rolled at a finishing temperature of 860 ° C. or more and 900 ° C. or less, wound at 550 ° C. or less, and then cold rolled to 70% or more. Cold-rolled steel sheet cold-rolled at a rolling rate and recrystallized by continuous annealing at 750 ° C or higher and 850 ° C or lower is Al: 40-70 wt% and Si:
An average spangle particle size of 0.7 is characterized by plating in an Al-Zn alloy molten bath containing 0.5 to 1.5 wt%.
A method for manufacturing a hot-dip Zn-Al alloy-plated steel sheet having a plating surface of not more than mm.
Hf、Ｖの１種もしくは２種以上を各0.01〜0.4 wt％、お
よび／またはTiを0.40wt％以下含有する、請求項３また
は４記載の方法。5. The Zn—Al based alloy molten bath further comprises Zr,
The method according to claim 3 or 4, wherein each of Hf and V is contained in an amount of 0.01 to 0.4 wt% and / or Ti of 0.40 wt% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8022786A JP3052822B2 (en) | 1996-02-08 | 1996-02-08 | Micro spangle hot-dip Zn-Al alloy coated steel sheet and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8022786A JP3052822B2 (en) | 1996-02-08 | 1996-02-08 | Micro spangle hot-dip Zn-Al alloy coated steel sheet and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09209109A true JPH09209109A (en) | 1997-08-12 |
| JP3052822B2 JP3052822B2 (en) | 2000-06-19 |
Family
ID=12092369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8022786A Expired - Fee Related JP3052822B2 (en) | 1996-02-08 | 1996-02-08 | Micro spangle hot-dip Zn-Al alloy coated steel sheet and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3052822B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003213396A (en) * | 2002-01-18 | 2003-07-30 | Jfe Engineering Kk | Surface-treated steel plate of excellent machinability and corrosion resistance of machined part, and manufacturing method thereof |
| WO2005056863A1 (en) * | 2003-12-12 | 2005-06-23 | Sumitomo Metal Industries, Ltd. | Hot-dip zinc plated steel sheet and process for producing the same |
| WO2006105593A1 (en) * | 2005-04-05 | 2006-10-12 | Bluescope Steel Limited | Metal-coated steel strip |
| CN101880800A (en) * | 2010-05-26 | 2010-11-10 | 上海大学 | High Al system Al-Zn-Si-Ti hot dip plating alloy with small crystal particles and high corrosion resistance |
| AU2006230798B2 (en) * | 2005-04-05 | 2011-06-02 | Bluescope Steel Limited | Metal-coated steel strip |
| KR20220027544A (en) * | 2020-08-27 | 2022-03-08 | 현대제철 주식회사 | Method of manufacturing galvanized iron steel with controlling size of spangles and apparatus of manufacturing galvanized iron steel |
| CN115161547A (en) * | 2022-04-27 | 2022-10-11 | 日照钢铁控股集团有限公司 | Manufacturing method of atmospheric corrosion resistant checkered plate |
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1996
- 1996-02-08 JP JP8022786A patent/JP3052822B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003213396A (en) * | 2002-01-18 | 2003-07-30 | Jfe Engineering Kk | Surface-treated steel plate of excellent machinability and corrosion resistance of machined part, and manufacturing method thereof |
| WO2005056863A1 (en) * | 2003-12-12 | 2005-06-23 | Sumitomo Metal Industries, Ltd. | Hot-dip zinc plated steel sheet and process for producing the same |
| JPWO2005056863A1 (en) * | 2003-12-12 | 2007-07-05 | 住友金属工業株式会社 | Hot-dip galvanized steel sheet and manufacturing method thereof |
| JP4506672B2 (en) * | 2003-12-12 | 2010-07-21 | 住友金属工業株式会社 | Hot-dip galvanized steel sheet and manufacturing method thereof |
| WO2006105593A1 (en) * | 2005-04-05 | 2006-10-12 | Bluescope Steel Limited | Metal-coated steel strip |
| JP2008534786A (en) * | 2005-04-05 | 2008-08-28 | ブルースコープ・スティール・リミテッド | Metal coated steel strip |
| AU2006230798B2 (en) * | 2005-04-05 | 2011-06-02 | Bluescope Steel Limited | Metal-coated steel strip |
| US8293376B2 (en) | 2005-04-05 | 2012-10-23 | Bluescope Steel Limited | Metal-coated steel strip |
| CN101880800A (en) * | 2010-05-26 | 2010-11-10 | 上海大学 | High Al system Al-Zn-Si-Ti hot dip plating alloy with small crystal particles and high corrosion resistance |
| KR20220027544A (en) * | 2020-08-27 | 2022-03-08 | 현대제철 주식회사 | Method of manufacturing galvanized iron steel with controlling size of spangles and apparatus of manufacturing galvanized iron steel |
| CN115161547A (en) * | 2022-04-27 | 2022-10-11 | 日照钢铁控股集团有限公司 | Manufacturing method of atmospheric corrosion resistant checkered plate |
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| Publication number | Publication date |
|---|---|
| JP3052822B2 (en) | 2000-06-19 |
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