JP3225911B2 - Unrecrystallized Al-Zn-based plated steel sheet excellent in design and manufacturing method thereof - Google Patents
Unrecrystallized Al-Zn-based plated steel sheet excellent in design and manufacturing method thereofInfo
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- JP3225911B2 JP3225911B2 JP00029098A JP29098A JP3225911B2 JP 3225911 B2 JP3225911 B2 JP 3225911B2 JP 00029098 A JP00029098 A JP 00029098A JP 29098 A JP29098 A JP 29098A JP 3225911 B2 JP3225911 B2 JP 3225911B2
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、高強度で建材用途
に適した、高耐食性および優れた意匠性を有する未再結
晶Al−Zn系めっき鋼板およびその製造方法に関する。The present invention relates to a non-recrystallized Al-Zn-based plated steel sheet having high strength and suitable for use as a building material, having high corrosion resistance and excellent design properties, and a method for producing the same.
【０００２】[0002]
【従来の技術】建材、家電用途には、従来より溶融Znめ
っき鋼板が使用されていたが、近年、さらに改善された
高耐食、高耐久性を有する溶融Al−Zn系めっき鋼板の使
用量が増加している。このうち、めっき皮膜中にAlを約
55％、Siを約1.6 ％含有する溶融Al-Zn めっき鋼板は、
表面に美麗なスパングル模様を有していることから、意
匠性もひとつの特徴である。2. Description of the Related Art Hot-dip Zn-plated steel sheets have been used for construction materials and home appliances. Recently, however, the amount of hot-dip Al-Zn-based coated steel sheets with even higher corrosion resistance and high durability has been improved. It has increased. Of these, Al in the plating film
Hot-dip Al-Zn coated steel sheet containing 55% and about 1.6% Si
Since it has a beautiful spangle pattern on its surface, its design is also one of its features.
【０００３】ところで、建材用途、例えば屋根、壁材に
用いる鋼板には、耐食性のほか、衝撃、荷重に耐えるた
めの強度も必要である。高強度のZnめっき鋼板を得る方
法としては、母材を再結晶に達しない温度 (通常540 ℃
以下) で焼鈍および溶融めっき処理などの操業をする技
術がある。この場合、再結晶が行われる通常の一般材の
焼鈍温度 (通常680 ℃以上) と比べ、かなり低い温度で
焼鈍処理などが行われる。By the way, steel sheets used for building materials, for example, roofs and wall materials, are required to have not only corrosion resistance but also strength to withstand impact and load. As a method of obtaining a high-strength Zn-plated steel sheet, a temperature at which the base material does not reach recrystallization (usually 540 ° C)
The following technologies are available for operations such as annealing and hot-dip plating. In this case, the annealing treatment and the like are performed at a considerably lower temperature than the normal annealing temperature (normally 680 ° C. or higher) of a general material in which recrystallization is performed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、55％Al
−1.6 ％Si−Znめっき鋼板の場合、焼鈍温度が低くなる
と、その特徴である表面のスパングル模様が微細化する
傾向にあり、スパングル模様があまりに微細化した場
合、意匠性が損なわれてしまう。スパングル模様は母材
の表面性状などによっても変化するため、焼鈍温度が低
くても、必ずしも微細化するとは限らないが、微細化す
る確率が高くなる。However, 55% Al
In the case of a -1.6% Si-Zn plated steel sheet, when the annealing temperature is lowered, the spangle pattern on the surface, which is a characteristic of the steel sheet, tends to be fine. If the spangle pattern is too fine, the design is impaired. Since the spangle pattern changes depending on the surface properties of the base material and the like, even if the annealing temperature is low, the fineness is not always reduced, but the probability of the fineness increases.
【０００５】これらの矛盾する傾向を両立させるには、
できるだけ高い再結晶温度を有する鋼板を用いれば、再
結晶温度未満でかつ高い加熱温度で操業することが可能
になる。かかる技術については、特開平２−149655号公
報が、母材にTi、Nb、Ｂを添加して高い再結晶温度を有
する鋼板を提案している。しかしながら、この技術では
上層のめっき皮膜のAl含有量をAl＝３〜８％に限定して
いるため、耐食性は溶融Znめっきよりは上回るものの、
近年のクロメート・薄膜樹脂のみで生地品として屋根・
壁等に用いられる場合等の品質要求からは不十分な用途
も多く、また外観の意匠性は全く期待できない。[0005] To balance these conflicting tendencies,
If a steel sheet having a recrystallization temperature as high as possible is used, it is possible to operate at a lower heating temperature and a higher heating temperature. As for such a technique, Japanese Patent Application Laid-Open No. 2-149655 proposes a steel sheet having a high recrystallization temperature by adding Ti, Nb, and B to a base material. However, in this technique, the Al content of the upper plating film is limited to Al = 3 to 8%, so that the corrosion resistance is higher than that of hot-dip Zn plating,
Roofs and fabrics made of only recent chromate and thin film resins
There are many applications that are insufficient due to quality requirements such as when used for walls and the like, and the design of appearance cannot be expected at all.
【０００６】本発明の課題は、例えば50kg/mm2以上とい
う高強度と意匠性を両立させた未再結晶溶融Al−Zn合金
めっき鋼板とその製造方法を提供することである。An object of the present invention is to provide a non-recrystallized hot-dip Al-Zn alloy-plated steel sheet having both high strength of, for example, 50 kg / mm 2 or more and design property, and a method for producing the same.
【０００７】[0007]
【課題を解決するための手段】ここに、本発明者は、母
材としてできるだけ高い再結晶温度を有する鋼板を用い
れば、再結晶未満であっても高い加熱温度で操業するこ
とが可能になることに着目して、本発明を完成した。Here, the present inventor can use a steel sheet having a recrystallization temperature as high as possible as a base material to operate at a high heating temperature even if less than recrystallization. The present invention has been completed by paying attention to this.
【０００８】よって、本発明は、Ti＝0.01〜0.4 重量
％、Nb＝0.01〜0.10重量％、Ｂ＝0.001 〜0.010 重量％
の１種または２種以上を添加した、Ｃ：0.1 重量％以下
の低炭素未再結晶冷延鋼板と、該鋼板上に設けたAl＝30
〜80重量％、Si＝１〜２重量％を含有するAl−Zn系溶融
めっき皮膜とから成り、該めっき皮膜の表面スパングル
粒径が平均0.2 mm以上であることを特徴とする意匠性に
優れた未再結晶Al−Znめっき鋼板である。Accordingly, the present invention relates to Ti = 0.01 to 0.4% by weight, Nb = 0.01 to 0.10% by weight, and B = 0.001 to 0.010% by weight.
And C: 0.1% by weight or less of a low-carbon unrecrystallized cold-rolled steel sheet, and Al = 30 provided on the steel sheet.
-80% by weight, Al-Zn hot-dip coated film containing Si = 1-2% by weight, and the average sponge particle diameter of the plated film is 0.2 mm or more. It is an unrecrystallized Al-Zn plated steel sheet.
【０００９】また、別の面からは、本発明はTi＝0.01〜
0.4 重量％、Nb＝0.01〜0.10重量％、Ｂ＝0.001 〜0.01
0 重量％の１種または２種以上を含有する、Ｃ: 0.1 重
量％以下の低炭素鋼板であって、圧延後の状態で未再結
晶組織の鋼板を、600 ℃以上、再結晶温度未満の温度域
で連続焼鈍した後、Al＝30〜80重量％、Si＝１〜２重量
％を含有するAl−Zn系溶融めっきを施し、得られためっ
き皮膜の表面スパングル粒径が平均0.2 mm以上とするこ
とを特徴とする意匠性に優れた未再結晶Al−Znめっき鋼
板の製造方法である。From another aspect, the present invention relates to the present invention, wherein Ti = 0.01 to
0.4% by weight, Nb = 0.01 to 0.10% by weight, B = 0.001 to 0.01
C: 0.1% by weight or less of a low-carbon steel sheet containing 0% by weight or more of one or more kinds, wherein a steel sheet having an unrecrystallized structure in a rolled state is not less than 600 ° C. and less than a recrystallization temperature. After continuous annealing in the temperature range, Al-Zn hot-dip plating containing Al = 30 to 80% by weight and Si = 1 to 2% by weight is applied, and the resulting coating has an average surface spangle diameter of 0.2 mm or more. This is a method for producing an unrecrystallized Al-Zn-plated steel sheet having excellent design properties.
【００１０】[0010]
【発明の実施の形態】次に、本発明について具体的に説
明する。本発明にかかる50kg/mm2以上の強度を有する未
再結晶溶融Al−Zn合金めっき鋼板は、Ｃ：0.10％以下の
低炭素鋼に、Ti＝0.01〜0.4 重量％、Nb＝0.01〜0.10重
量％、Ｂ＝0.001 〜0.010 重量％の１種または２種以上
を含有する。Next, the present invention will be described specifically. The unrecrystallized hot-dip Al-Zn alloy-coated steel sheet having a strength of 50 kg / mm 2 or more according to the present invention is obtained by adding C: 0.10% or less to low-carbon steel, Ti = 0.01 to 0.4% by weight, and Nb = 0.01 to 0.10% by weight. %, B = 0.001 to 0.010% by weight.
【００１１】ここで、Ｃ：0.10％以下としたのは、以下
の理由による。本発明で目的とする鋼板は、家電建材等
への適用を目的としているため、ロール成形等による曲
げ加工が実施される場合が多く、したがって、ある程度
の加工性が必要である。母材鋼中のＣは母材強度を上昇
させるのに有効だが、一方で加工性を極端に低下させ
る。そのため本発明では0.10重量％以下に制限する。鋼
中Ｃ量はより好ましくは0.07％以下である。Here, the reason why C is set to 0.10% or less is as follows. Since the steel sheet intended in the present invention is intended to be applied to home appliance building materials and the like, bending processing by roll forming or the like is often performed, and therefore, a certain degree of workability is required. C in the base steel is effective in increasing the strength of the base metal, but extremely lowers the workability. Therefore, in the present invention, it is limited to 0.10% by weight or less. The C content in steel is more preferably 0.07% or less.
【００１２】Tiは、0.01重量％以上の添加により再結晶
温度を上昇させる。これにより、再結晶未満温度であり
ながら、めっきの微細スパングル抑制に十分な加熱温度
が確保できる。しかし、0.4 重量％を超えて多く添加し
ても効果が飽和し、またコスト増につながる。[0012] Ti increases the recrystallization temperature by adding 0.01% by weight or more. Thus, a heating temperature sufficient to suppress fine spangles in plating can be ensured even at a temperature lower than recrystallization. However, adding more than 0.4% by weight saturates the effect and leads to an increase in cost.
【００１３】さらに過剰Ti量 (定義：Ti−48/12C−48/1
4N−48/32S) が経済的な理由から、−0.02〜0.03の範囲
にあることが望ましい。Nbは、0.01重量％以上の含有に
より再結晶温度を上昇させるが、0.10重量％を超えて多
く添加しても効果が飽和し、かつコスト増につながる。Further, the excess Ti amount (definition: Ti-48 / 12C-48 / 1
4N-48 / 32S) is preferably in the range of -0.02 to 0.03 for economic reasons. Nb increases the recrystallization temperature when it is contained at 0.01% by weight or more. However, if Nb is added in excess of 0.10% by weight, the effect is saturated and the cost increases.
【００１４】Ｂは、0.001 重量％以上の添加で再結晶温
度を増加させるが、0.010 重量％を超えて多く添加して
も効果が飽和し、コストが増加する。なお、Ti、Nb、Ｂ
はいずれか１種の単独添加または２種以上の複合添加の
いずれであってもよい。B increases the recrystallization temperature when it is added in an amount of 0.001% by weight or more. However, if B is added in excess of 0.010% by weight, the effect is saturated and the cost increases. Note that Ti, Nb, B
May be either one kind alone or a combination of two or more kinds.
【００１５】その他、Si、Mnなどについては特に制限は
なく、Ti、Nb、Ｂのいずれか１種の添加により600 ℃以
上の再結晶温度が確保される限り、通常の冷延鋼板に要
求されるものであればよい。Other than that, there is no particular limitation on Si, Mn, etc., as long as a recrystallization temperature of 600 ° C. or more is secured by the addition of any one of Ti, Nb, and B, a normal cold-rolled steel sheet is required. Anything can be used.
【００１６】また、かかる冷延鋼板は、圧延後の状態で
未再結晶組織の鋼板とするが、これは、建材等に使用す
る場合の所用の強度、例えば50kg/mm2以上を確保するた
めである。Further, such a cold-rolled steel sheet is a steel sheet having an unrecrystallized structure in a state after rolling. This is to ensure the required strength when used for building materials and the like, for example, 50 kg / mm 2 or more. It is.
【００１７】めっき皮膜中のAl含有量は、耐食性および
意匠性の両面から制限される。30重量％未満では無加工
部での耐食性能が劣り、80重量％超では鋼板端面や疵部
での耐食性に劣るためである。また、これらの領域では
スパングルが不明瞭になり意匠性が著しく損なわれる。
好ましくは45〜65重量％で、特に意匠性の点から50〜58
重量％がより望ましい。The Al content in the plating film is limited in terms of both corrosion resistance and design. If the amount is less than 30% by weight, the corrosion resistance in the unprocessed portion is inferior, and if the amount is more than 80% by weight, the corrosion resistance in the end face of the steel sheet or the flaw is inferior. Further, in these areas, spangles become unclear and the design is significantly impaired.
It is preferably 45 to 65% by weight, and particularly 50 to 58% in terms of design.
% By weight is more desirable.
【００１８】めっき皮膜中のSi％は、１重量％未満では
めっきの密着性が悪く、加工性に劣り、２重量％超では
めっきと鋼板の濡れ性が悪く、不めっき (めっきの表面
欠陥) が生じやすい。好ましいSi含有量は1.2 重量％以
上1.8 重量％未満である。If the Si% in the plating film is less than 1% by weight, the adhesion of the plating is poor and the workability is poor, and if it exceeds 2% by weight, the wettability between the plating and the steel sheet is poor, and the plating is not plated (surface defect of the plating). Tends to occur. The preferred Si content is at least 1.2% by weight and less than 1.8% by weight.
【００１９】焼鈍温度は、再結晶温度を超えると母材鋼
板の組織が再結晶組織となり十分な高強度が得られな
い。また600 ℃未満の低温では、スパングルが非常に微
細化する確率が高くなる。If the annealing temperature exceeds the recrystallization temperature, the structure of the base steel sheet becomes a recrystallized structure, and a sufficiently high strength cannot be obtained. At a low temperature of less than 600 ° C., the probability of spangles becoming extremely fine increases.
【００２０】またスパングルの大きさは、通常市場で要
求されている意匠性のレベルから0.2 mm以上と規定し
た。上限は特に規定しないが、本発明の方法では、４mm
以上のスパングルはほとんど得られず、５mmを超える大
きさのスパングルは通常得られない。Further, the size of the spangle is specified to be 0.2 mm or more from the level of designability usually required in the market. Although the upper limit is not particularly specified, in the method of the present invention, 4 mm
The above spangles are scarcely obtained, and spangles having a size exceeding 5 mm are usually not obtained.
【００２１】本発明にかかる上述のめっき鋼板の製造に
当たっては、前述の冷延鋼板を600℃以上再結晶温度以
下の温度領域で連続焼鈍したのち、Al＝30〜80重量％、
Si＝１〜２重量％を含有する溶融めっきを施し、そのめ
っき皮膜の表面スパングル粒径が平均0.2 mm以上とす
る。スパングルの大きさは焼鈍温度を変更することによ
って調整できるが、上述の本発明の焼鈍温度の範囲では
0.2 mm以上となる。In producing the above-described plated steel sheet according to the present invention, the above-mentioned cold-rolled steel sheet is continuously annealed in a temperature range of not less than 600 ° C. and not more than the recrystallization temperature, and then Al = 30 to 80% by weight,
Hot-dip plating containing Si = 1 to 2% by weight is applied, and the surface spangle particle size of the plating film is 0.2 mm or more on average. The size of the spangle can be adjusted by changing the annealing temperature, but within the above-described range of the annealing temperature of the present invention.
0.2 mm or more.
【００２２】[0022]
【実施例】(比較例)冷間圧延後の低炭素鋼板 (Ｃ＝0.00
2 〜0.05重量％、Ti＜0.01重量％、Nb＜0.01重量％、Ｂ
＜0.001 重量％、再結晶温度：580 ℃以下) に表１に示
す条件で、溶融めっきした場合の微小スパングル発生確
率と焼鈍温度との関係を調査した。[Example] (Comparative example) Low carbon steel sheet after cold rolling (C = 0.00
2 to 0.05% by weight, Ti <0.01% by weight, Nb <0.01% by weight, B
<0.001% by weight, recrystallization temperature: 580 ° C. or less) The relationship between the micro spangle generation probability and the annealing temperature when hot-dip plating was performed under the conditions shown in Table 1 was investigated.
【００２３】スパングル粒径は、めっき表面に任意の30
mm長さをとり、そこに含まれるスパングルの個数で割っ
たものをスパングル粒径とした。このようにして１つの
めっきサンプルについて任意の３ヵ所についてスパング
ル粒径を測定し、その平均が0.2 mm未満となったものに
ついては、微小スパングル発生材とした。The spangle particle size can be any 30
The length of the spangle was taken and divided by the number of spangles contained therein to give the spangle particle size. In this way, the spangle particle size was measured at any three places of one plating sample, and those having an average of less than 0.2 mm were regarded as minute spangle generating materials.
【００２４】表２にこの結果を示す。全体に焼鈍温度が
低いとスパングルが細かくなる傾向が認められる。この
場合焼鈍温度が低くても必ずしも微小スパングルになる
わけではないが、安定した外観を得る (20枚中発生２個
以下) であるためには、600℃以上で焼鈍する必要があ
る。Table 2 shows the results. When the annealing temperature is low as a whole, spangles tend to be fine. In this case, even if the annealing temperature is low, it does not necessarily result in minute spangles, but in order to obtain a stable appearance (2 or less out of 20 sheets), it is necessary to perform annealing at 600 ° C. or more.
【００２５】しかし、本例の鋼種は再結晶温度が580 ℃
以下であるため600 ℃以上で焼鈍すると強度は40kg/mm2
以下となってしまい、本発明の目的を達成することはで
きない。However, the steel type of this example has a recrystallization temperature of 580 ° C.
Because of the following, the strength is 40 kg / mm 2 when annealed at 600 ° C or more.
Therefore, the object of the present invention cannot be achieved.
【００２６】[0026]
【表１】 [Table 1]
【００２７】[0027]
【表２】 [Table 2]
【００２８】(実施例１)表３に化学成分を示す低炭素鋼
に対してTi、Nb、Ｂの少なくとも１種を添加した場合の
再結晶温度を調査した。その結果を図１に示す。(Example 1) The recrystallization temperature when at least one of Ti, Nb and B was added to low carbon steel having the chemical components shown in Table 3 was investigated. The result is shown in FIG.
【００２９】図１は過剰Ti量を横軸に取り再結晶温度を
示したものである。図中に○印で示されるグラフは表３
のＡ鋼種、●印で示されるグラフは同じくＢ鋼種に対し
てTiを添加して過剰Ti量を変化させた場合の再結晶温度
の変化を示すものである。なお、図中の□印はＡ鋼種に
対してNb 0.030％を含有添加した場合、■印はＡ鋼種に
対してＢ 0.005wt％およびNb 0.020wt％を添加含有させ
た場合、△印はＢ鋼種に対してＢ 0.001％を含有添加さ
せた場合の、それぞれの再結晶温度を示す。FIG. 1 shows the recrystallization temperature by taking the excess Ti amount on the horizontal axis. The graphs marked with a circle in the figure are shown in Table 3.
The A type of steel and the graph indicated by the symbol ● indicate the change in the recrystallization temperature when Ti is added to the B type to change the excess Ti amount. In the figure, the symbol □ indicates the case where Nb 0.030% is added and added to the steel A type, the symbol 場合 indicates the case where B 0.005wt% and Nb 0.020wt% are added and added to the steel type A, The following shows the respective recrystallization temperatures when 0.001% of B is added to the steel type.
【００３０】図１の結果からも容易に分かるように、い
ずれにおいても再結晶温度はTi、Nb、Ｂの無添加の鋼種
より100 ℃以上上昇している。従って、Ti、Nb、Ｂを１
種以上含有する低炭素鋼板に600 〜700 ℃に加熱した焼
鈍を施すことで未再結晶のZn−Al合金めっき鋼板を得る
ことができ、強度50kg/mm2以上を確保することができる
ことが分かる。As can be easily understood from the results shown in FIG. 1, the recrystallization temperature is higher by 100 ° C. or more than that of the steels with no addition of Ti, Nb and B. Therefore, Ti, Nb, and B are 1
It can be seen that by subjecting a low-carbon steel sheet containing more than one kind to annealing at 600 to 700 ° C, an unrecrystallized Zn-Al alloy-plated steel sheet can be obtained, and a strength of 50 kg / mm 2 or more can be secured. .
【００３１】[0031]
【表３】 [Table 3]
【００３２】(実施例２)表４に化学成分を示す鋼種１〜
20を用いた冷延鋼板を、表１に示す条件（ただしNo.19
、20は除く) で焼鈍およびめっきを行い、その表面外
観、引張強さ、耐食性を評価した。(Example 2) Steel types 1 to 4 whose chemical components are shown in Table 4
The cold rolled steel sheet using No. 20 was subjected to the conditions shown in Table 1 (however, No. 19
, 20 were excluded) and the surface appearance, tensile strength, and corrosion resistance were evaluated.
【００３３】表面外観は比較例で説明したと同様の方法
で計測した平均スパングル粒径が0.2 mm以上のものを○
とした。また耐食性は、めっきしたサンプルを塩水噴霧
試験(JIS Z2371に準拠) にかけ、500hr 後に、赤錆がサ
ンプル面積の何％に達しているかで評価した。それらの
結果を表４に示す。As for the surface appearance, those having an average spangle particle size of 0.2 mm or more measured by the same method as described in the comparative example were evaluated as ○.
And The corrosion resistance was evaluated by subjecting the plated sample to a salt spray test (based on JIS Z2371), and after 500 hours, what percentage of the sample area red rust had reached. Table 4 shows the results.
【００３４】本発明の鋼板は、通常鋼の焼鈍温度で焼鈍
している(No.1 〜14) にも関わらず、引張強さは50kg/m
m2以上あり焼鈍後の組織は未再結晶であった。これに対
し通常鋼(No.15、16) を通常の焼鈍温度で焼鈍した場合
には、引張強さが約30kg/m2で高強度な鋼板が得られな
い。また本発明の成分範囲の鋼板であっても焼鈍温度60
0 ℃以下(No.17、18) では、比較例で述べたように微細
スパングル発生確率が高い (表４中では鋼種No.17 、18
とも微小スパングル発生) 。The steel sheet of the present invention has a tensile strength of 50 kg / m, despite the fact that it is annealed at the annealing temperature of ordinary steel (Nos. 1 to 14).
m 2 or more, and the structure after annealing was not recrystallized. On the other hand, when the normal steels (Nos. 15 and 16) are annealed at the normal annealing temperature, a high strength steel sheet having a tensile strength of about 30 kg / m 2 cannot be obtained. Further, even in the steel sheet having the composition range of the present invention, the annealing temperature is 60 ° C.
At 0 ° C or lower (Nos. 17 and 18), the probability of occurrence of fine spangles is high as described in the comparative example.
Both generate minute spangles).
【００３５】また従来例(No.19、20) は特開平２−1496
55号公報に対応技術でそれぞれめっき条件は表５の通り
である。これらは、めっき皮膜中のAl含有中のAl含有量
が小さいため、明確なスパングル模様が現れず本発明の
ような意匠性はない。まためっき付着量 (重量) が、本
発明例より大きいにも関わらず、耐食性も本発明より格
段に落ちる。A conventional example (Nos. 19 and 20) is disclosed in Japanese Patent Laid-Open No. 2-1496.
Table 5 shows the plating conditions for the technology corresponding to Japanese Patent Publication No. 55. These have a small Al content in the Al content in the plating film, so that a clear spangle pattern does not appear and does not have the design property as in the present invention. Further, the corrosion resistance is remarkably lower than that of the present invention, even though the plating adhesion amount (weight) is larger than that of the present invention.
【００３６】[0036]
【表４】 [Table 4]
【００３７】[0037]
【表５】 [Table 5]
【００３８】[0038]
【発明の効果】本発明に示すように、従来の低炭素鋼に
Ti、Nb、Ｂの少なくとも１種を所定量添加することによ
り、スパングル模様を有した意匠性に優れる未再結晶Zn
−Al合金めっき鋼板を安定的に製造することができる。As shown in the present invention, the conventional low carbon steel
By adding at least one of Ti, Nb, and B in a predetermined amount, unrecrystallized Zn having a spangled pattern and excellent in design properties.
-Al alloy plated steel sheets can be manufactured stably.
【図１】低炭素鋼に含有するTi、Nb、Ｂと再結晶温度と
の関係を横軸に過剰Ti量をとって表したグラフである。FIG. 1 is a graph showing the relationship between Ti, Nb, and B contained in low carbon steel and recrystallization temperature, with the amount of excess Ti taken on the horizontal axis.
Claims (2)
重量％、Ｂ＝0.001〜0.010 重量％の１種または２種以
上を添加した、Ｃ：0.1 重量％以下の低炭素未再結晶冷
延鋼板と、該鋼板上に設けたAl＝30〜80重量％、Si＝１
〜２重量％を含有するAl−Zn系溶融めっき皮膜とから成
り、該めっき皮膜の表面スパングル粒径が平均0.2 mm以
上であることを特徴とする意匠性に優れた未再結晶Al−
Znめっき鋼板。1. Ti = 0.01 to 0.4% by weight, Nb = 0.01 to 0.10
C: 0.1% by weight or less of low-carbon non-recrystallized cold-rolled steel sheet to which one or more kinds of B = 0.001 to 0.010% by weight are added, and Al = 30 to 80% by weight provided on the steel sheet %, Si = 1
An Al-Zn based hot-dip coating containing 0.1 to 2% by weight, the average thickness of the surface of which is 0.2 mm or more.
Zn plated steel sheet.
重量％、Ｂ＝0.001〜0.010 重量％の１種または２種以
上を含有する、Ｃ: 0.1 重量％以下の低炭素鋼板であっ
て、圧延後の状態で未再結晶組織の鋼板を、600 ℃以
上、再結晶温度未満の温度域で連続焼鈍した後、Al＝30
〜80重量％、Si＝１〜２重量％を含有するAl−Zn系溶融
めっきを施し、得られためっき皮膜の表面スパングル粒
径が平均0.2 mm以上とすることを特徴とする意匠性に優
れた未再結晶Al−Znめっき鋼板の製造方法。2. Ti = 0.01 to 0.4% by weight, Nb = 0.01 to 0.10
C: A low carbon steel sheet containing one or more kinds of B = 0.001 to 0.010% by weight, C: 0.1% by weight or less and having an unrecrystallized structure in a state after rolling at 600 ° C. As described above, after continuous annealing in a temperature range lower than the recrystallization temperature, Al = 30
Excellent design, characterized in that Al-Zn hot-dip plating containing up to 80% by weight and Si = 1 to 2% by weight is applied, and the surface spangle particle diameter of the obtained plating film is 0.2 mm or more on average. Of producing unrecrystallized Al-Zn plated steel sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00029098A JP3225911B2 (en) | 1998-01-05 | 1998-01-05 | Unrecrystallized Al-Zn-based plated steel sheet excellent in design and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00029098A JP3225911B2 (en) | 1998-01-05 | 1998-01-05 | Unrecrystallized Al-Zn-based plated steel sheet excellent in design and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11193453A JPH11193453A (en) | 1999-07-21 |
| JP3225911B2 true JP3225911B2 (en) | 2001-11-05 |
Family
ID=11469789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00029098A Expired - Fee Related JP3225911B2 (en) | 1998-01-05 | 1998-01-05 | Unrecrystallized Al-Zn-based plated steel sheet excellent in design and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3225911B2 (en) |
Families Citing this family (1)
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|---|---|---|---|---|
| JP7234739B2 (en) * | 2019-03-28 | 2023-03-08 | 日本製鉄株式会社 | Manufacturing method for high-strength hot-dip plated steel strip |
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1998
- 1998-01-05 JP JP00029098A patent/JP3225911B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11193453A (en) | 1999-07-21 |
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