JP2000336466A - Production of hot dip zinc-aluminum alloy plated steel sheet - Google Patents
Production of hot dip zinc-aluminum alloy plated steel sheetInfo
- Publication number
- JP2000336466A JP2000336466A JP11096525A JP9652599A JP2000336466A JP 2000336466 A JP2000336466 A JP 2000336466A JP 11096525 A JP11096525 A JP 11096525A JP 9652599 A JP9652599 A JP 9652599A JP 2000336466 A JP2000336466 A JP 2000336466A
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- steel sheet
- plating
- spangle
- steel
- furnace
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、建材、家電製品、
自動車等の用途に使用するのに適した溶融Zn−Al系合金
めっき鋼板の製造方法、特に、めっき表面のスパングル
模様が鮮明で美麗な溶融Zn−Al系合金めっき鋼板の製造
方法に関する。TECHNICAL FIELD The present invention relates to building materials, home electric appliances,
The present invention relates to a method for producing a hot-dip Zn-Al-based alloy-plated steel sheet suitable for use in applications such as automobiles, and more particularly to a method for producing a hot-dip Zn-Al-based alloy-plated steel sheet having a clear and spangled pattern on a plating surface.
【０００２】[0002]
【従来の技術】従来より、溶融Zn−Al系合金めっきは、
耐食性と耐候性を改善するために鋼板に施こすものとし
て公知であるが、鋼板の高品質化が求められるにつれ、
近年その適用量が増大している。2. Description of the Related Art Conventionally, hot-dip Zn-Al-based alloy plating
Known to be applied to steel sheets to improve corrosion resistance and weather resistance, but as high quality steel sheets are required,
In recent years, the application amount has increased.
【０００３】そのような溶融Zn−Al系合金めっき鋼板の
代表例としての溶融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、家電製品、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。[0003] A hot-dip Zn-55% Al alloy coated steel sheet, which is a representative example of such hot-dip Zn-Al-based alloy coated steel sheet, has the durability, heat resistance and heat reflectivity of aluminum and the sacrificial corrosion resistance of zinc. It is widely used as a high-performance plated steel sheet in combination with building materials, home appliances, and automobile parts. This plated steel sheet is typically made of Al: 55% by weight.
%, Zn: 43.4%, and Si: 1.6%. The ratio of Al and Zn is determined in consideration of corrosion resistance, and Si is added to suppress an alloy reaction with a steel substrate that inhibits plating adhesion.
【０００４】この溶融Zn−55％Al系合金めっき鋼板は、
Al含有率が少ない他の溶融Zn−Al系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、意匠性に優れている特性から、生地のままで、
商工業用および一般用の建造物の屋根・壁等、あるいは
器物などに広く利用されている。[0004] This hot-dip Zn-55% Al-based alloy plated steel sheet
Unlike other hot-dip Zn-Al alloy-plated steel sheets with a low Al content, the plating surface exhibits a characteristic silver-white spangle pattern, and because of its excellent design properties, the fabric remains
It is widely used for roofs and walls of buildings for commercial and industrial use and for general use, or for objects.
【０００５】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。溶融Zn−55％Al系合金め
っき鋼板の場合のめっき表面のスパングル粒径は平均0.
5 〜1.5 mm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、めっき後の凝固速度を調整しても
スパングル粒径が小さくなることがあり、めっき後の凝
固速度の調整だけでは鮮明で美麗なスパングルを得るの
は困難であった。In general, it is known that the spangle particle size of a hot-dip coated steel sheet decreases when the cooling rate (and, consequently, the solidification rate of the plating film) is increased by increasing the air flow during forced cooling after hot-dip coating. In the case of hot-dip Zn-55% Al-based alloy plated steel sheet, the average spangle diameter of the plating surface is 0.
It is 5 to 1.5 mm, and the spangle pattern can be visually identified. However, even if the solidification speed after plating is adjusted, the spangle particle size may be small, and it is difficult to obtain a clear and beautiful spangle only by adjusting the solidification speed after plating.
【０００６】従来にあって、このスパングルのばらつき
を抑える技術としては、以下の方法が提案されている。 1)特開平８−49055 号公報：めっき浴中のTi濃度を規定
する。 2)特開平９−241814号公報：めっき浴浸漬時間を２秒以
上とする。 3)特開平９−25550 号公報：めっき設備のスナウト内の
露点、水素濃度および浴温度を管理する。 4)特開平９−235661号公報：鋼板表面を0.05μｍ以上研
削する。 5)特開平10−18009 号および同10−18013 号各公報：鋼
板表面粗さ、うねりを制御する。 6)特開平10−18010 号および同18012 号各公報：鋼板表
面の集合組織、結晶粒径を制御する。Conventionally, the following method has been proposed as a technique for suppressing the spangle variation. 1) JP-A-8-49055: Defines the Ti concentration in the plating bath. 2) JP-A-9-241814: The immersion time in the plating bath is 2 seconds or more. 3) JP-A-9-25550: Control the dew point, hydrogen concentration and bath temperature in the snout of the plating equipment. 4) JP-A-9-235661: Grind the surface of a steel sheet by 0.05 μm or more. 5) JP-A Nos. 10-18009 and 10-18013: Control of steel sheet surface roughness and undulation. 6) JP-A-10-18010 and JP-A-18012: Control of texture and grain size of steel sheet surface.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記技
術にはそれぞれ以下のような問題がある。まず、上記1)
の方法ではめっき浴中にTi：0.001 〜0.5 wt％を含有し
ている場合はスパングルが微細になるという微細スパン
グルの製造方法が記載されている。しかし逆に、スパン
グルを安定的に大きくするためにめっき浴成分に不純物
として含まれるTi等の成分を除去するのは困難であり、
母材間ないしは同一鋼板内の幅方向、長手方向のスパン
グル粒径の変化に対応できず、鮮明で美麗なスパングル
を得るのは難しい。However, each of the above techniques has the following problems. First, 1) above
Describes a method for producing fine spangles in which when the plating bath contains 0.001 to 0.5 wt% of Ti, the spangles become fine. However, conversely, it is difficult to remove components such as Ti contained as impurities in the plating bath components in order to stably increase the spangle.
It is not possible to cope with a change in spangle particle size in the width direction and the longitudinal direction between base materials or in the same steel sheet, and it is difficult to obtain a clear and beautiful spangle.
【０００８】上記2)については、めっきだけでスパング
ルを制御できる点では有利だが、浴中ロールの昇降装置
等の設備を新たに設ける必要がありコスト的に不利であ
る。また、浸漬時間を長くしすぎると、スパングル全体
が微細化し、溶融Zn−Al−Si系合金めっき鋼板が本来持
つ意匠性が損なわれる。[0008] The above item 2) is advantageous in that spangles can be controlled only by plating, but it is necessary to newly provide equipment such as a device for raising and lowering a roll in a bath, which is disadvantageous in cost. On the other hand, if the immersion time is too long, the whole spangle becomes finer, and the original design of the hot-dip Zn—Al—Si alloy-plated steel sheet is impaired.
【０００９】上記3)の方法は、スナウト内の雰囲気制御
によりめっき浴からのZnの蒸発を抑える方法である。こ
こで蒸発Znはめっきの欠陥もしくはスパングル模様のム
ラを誘発するものである。従って、3)の方法は通常の方
法で得られるスパングル模様のムラのレベルから悪化さ
せないというだけで、例えば、コイル間のスパングル模
様のばらつきを抑えることはできない。The method 3) is a method of controlling the evaporation of Zn from the plating bath by controlling the atmosphere in the snout. Here, evaporated Zn induces plating defects or uneven spangle patterns. Therefore, the method 3) does not deteriorate the spangle pattern unevenness level obtained by the normal method, but cannot suppress, for example, the variation of the spangle pattern between the coils.
【００１０】上記4)、5)、6)の方法では、圧延工程など
のめっきの前工程に制約をかけることになり、また条件
に外れた鋼板をめっき原版として用いることができなく
なるなど製造コストの上昇を招く。The methods 4), 5) and 6) impose restrictions on the pre-plating steps such as the rolling step, and also make it impossible to use a steel sheet that is out of the required conditions as a plating master. Cause a rise.
【００１１】ここに、本発明の目的は、めっき鋼板の母
材となる材料間およびめっき直後の冷却速度によってサ
イズが異なるスパングル粒径を安定的に大きなものに制
御することにより鮮明で美麗なスパングルを有し、めっ
き皮膜の加工性に優れた溶融Zn−Al系合金めっき鋼板を
提供することである。[0011] It is an object of the present invention to provide a sharp and beautiful spangle by stably controlling the spangle particle size having a different size depending on the cooling rate immediately after plating between the materials used as the base material of the plated steel sheet. And to provide a hot-dip Zn—Al-based alloy plated steel sheet having excellent workability of a plating film.
【００１２】[0012]
【課題を解決するための手段】本発明者らは、かかる課
題を達成するために従来技術の問題がめっき前までの母
材の鋼板化学成分、溶融めっき直前に行う連続焼鈍の雰
囲気条件が異なることに起因することに着目して種々検
討・研究を重ね、溶融Zn−55％Al−1.6 ％Si合金めっき
鋼板を製造する際に、鋼中のMn量と連続焼鈍炉の雰囲気
を下記式(1) のように規定することでスパングルが微細
化することなく、意匠性に優れた表面となることを知
り、本発明を完成した。In order to achieve the object, the present inventors have found that the problems of the prior art differ in the chemical composition of the base steel sheet before plating and the atmosphere conditions of continuous annealing performed immediately before hot-dip plating. Various studies and researches were repeated focusing on the cause of this, and when producing a hot-dip Zn-55% Al-1.6% Si alloy coated steel sheet, the amount of Mn in the steel and the atmosphere of the continuous annealing furnace were determined by the following formula ( It was found that by defining as in 1), the spangles did not become fine and the surface became excellent in design, and the present invention was completed.
【００１３】よって、本発明は、Al：40〜70wt％、Si：
0.5 〜5.0 wt％、およびZnおよび不可避的不純物：残量
を含んだめっき浴に鋼板を浸漬してめっき処理を施す溶
融Zn−Al系合金めっき鋼板の製造方法において、例えば
スラブを熱間圧延し、かつ酸洗および冷間圧延して得た
鋼板、すなわち冷延鋼板を下記(1) 式を満たす条件の雰
囲気で連続焼鈍することを特徴とした、めっき表面の平
均スパングル粒径が0.7 mm以上である溶融Zn−Al系合金
めっき鋼板の製造方法である。Therefore, the present invention relates to a method for producing Al: 40 to 70 wt%, Si:
0.5 to 5.0 wt%, Zn and unavoidable impurities: In a method for producing a hot-dip Zn-Al-based alloy-coated steel sheet in which a steel sheet is immersed in a plating bath containing a residual amount to perform plating, for example, a slab is hot-rolled. The steel sheet obtained by pickling and cold rolling, that is, cold-rolled steel sheet, characterized by being continuously annealed in an atmosphere satisfying the following equation (1), the average spangle diameter of the plating surface is 0.7 mm or more This is a method for producing a hot-dip Zn—Al-based alloy-plated steel sheet.
【００１４】 Ｄh ≧ (0.5H＋15) ln[Mn]＋1.6H−33 ・・・・・(1) Ｄh ：連続焼鈍炉の加熱帯の露点 [℃] Ｈ ：連続焼鈍炉のH2濃度 [vol%] [Mn] ：鋼中Mn wt％Dh ≧ (0.5H + 15) ln [Mn] + 1.6H−33 (1) Dh: dew point of heating zone of continuous annealing furnace [° C.] H: H 2 concentration of continuous annealing furnace [vol] %] [Mn]: Mn wt% in steel
【００１５】[0015]
【発明の実施の形態】次に、本発明における製造条件を
上述のように規定した理由とそれによる効果について記
述する。Next, the reasons for defining the manufacturing conditions in the present invention as described above and the effects thereof will be described.
【００１６】(スパングルが鮮明な条件)スパングルの鮮
明性については、スパングル粒径が0.7 mm以上である場
合、スパングルを視認できるため意匠性が良いと判断さ
れる。(Conditions for Clear Spangles) Regarding the sharpness of spangles, when the spangle particle size is 0.7 mm or more, the spangles can be visually recognized, so that the design is judged to be good.
【００１７】(母材製造条件)本発明にあっても、めっき
処理すべき鋼板は、例えばスラブを熱間圧延し、かつ酸
洗および冷間圧延した冷延鋼板であればよい。化学成分
値については、一般にめっき鋼板に採用されているアル
ミキルド鋼であれば、[Mn]以外については特に限定しな
い。(Base Material Manufacturing Conditions) Even in the present invention, the steel sheet to be plated may be a cold-rolled steel sheet obtained by hot rolling a slab, pickling and cold rolling. The chemical component value is not particularly limited except for [Mn] as long as it is an aluminum killed steel generally used for plated steel sheets.
【００１８】Mnは従来より鋼の強度を確保するために添
加される強化元素であるが、鋼中の[Mn]量が多いと鋼板
表面にMnが濃化し、めっき前の連続焼鈍時に鋼板表面の
還元鉄の生成を阻害し、めっきと鋼板界面の合金層形成
が不均一になり鮮明なスパングルが生じない。熱間圧延
条件、冷間圧延条件については特に限定しない。Mn is a strengthening element conventionally added to secure the strength of steel. If the amount of [Mn] in steel is large, Mn is concentrated on the surface of the steel sheet, and the surface of the steel sheet is subjected to continuous annealing before plating. And the formation of an alloy layer at the interface between the plating and the steel sheet becomes non-uniform, and no sharp spangle occurs. Hot rolling conditions and cold rolling conditions are not particularly limited.
【００１９】(式(1) の意義について)後述する実施例の
結果からも分かるように式(1) の関係を満足するものは
いずれもスパングル粒径が0.7 mm以上であり、したがっ
て、本発明にしたがって式(1) を満足する操業を行うこ
とで0.7 mm以上のスパングル粒径のものが安定して得ら
れる。なお、連続焼鈍炉の雰囲気ガスの露点は加熱帯に
おいて規制するが、均熱帯においても同様に規制するの
が好ましい。(Regarding the Significance of Formula (1)) As can be seen from the results of the examples described later, those satisfying the relationship of Formula (1) all have a spangle particle size of 0.7 mm or more. By performing the operation satisfying the expression (1) according to the formula, a spangle having a particle diameter of 0.7 mm or more can be stably obtained. Although the dew point of the atmospheric gas in the continuous annealing furnace is regulated in the heating zone, it is preferable to regulate the dew point in the solitary zone in the same manner.
【００２０】(連続溶融亜鉛めっき条件)母材鋼板を連続
溶融亜鉛めっきライン内の連続焼鈍炉において、母材鋼
中のMn量に応じた雰囲気 (露点および水素温度) で650
〜830 ℃の焼鈍を行い、連続焼鈍炉内の冷却帯で概略め
っき浴と同等の温度まで冷却した後、Al：40〜70wt％、
Si：0.5 〜5.0 wt％、およびZn：残量を含んだめっき浴
条件でめっきする。(Continuous hot-dip galvanizing conditions) In a continuous annealing furnace in a continuous hot-dip galvanizing line, the base steel sheet was heated for 650 in an atmosphere (dew point and hydrogen temperature) corresponding to the amount of Mn in the base steel.
After annealing at ~ 830 ° C and cooling to a temperature approximately equivalent to that of the plating bath in a cooling zone in a continuous annealing furnace, Al: 40 ~ 70wt%,
Plating is performed under plating bath conditions including Si: 0.5 to 5.0 wt% and Zn: the remaining amount.
【００２１】本発明の好適態様にあっては、めっき直後
に鋼板を10〜30℃/secの冷却速度で冷却する。冷却速度
が10℃/sec未満ではスパングルは大きくなるものの、め
っきと鋼板界面の合金層が厚く成長しめっきの加工性が
劣化する。冷却速度が30℃/sec超ではスパングルが微細
化してしまう。その他の条件については特に限定しな
い。かくして、本発明によればスパングル粒径が0.7 mm
以上のものが安定して得られ、歩留りも大幅に改善され
る。In a preferred embodiment of the present invention, the steel sheet is cooled at a cooling rate of 10 to 30 ° C./sec immediately after plating. If the cooling rate is less than 10 ° C./sec, spangles increase, but the alloy layer at the interface between the plating and the steel sheet grows thickly and the workability of plating deteriorates. If the cooling rate is higher than 30 ° C./sec, spangles become finer. Other conditions are not particularly limited. Thus, according to the present invention, the spangle particle size is 0.7 mm
The above is stably obtained, and the yield is greatly improved.
【００２２】[0022]
【実施例】以下に本発明の実施例を説明する。 (実施例１)めっき用母材として、Ｃ％＝0.04〜0.05、Si
％≦0.02、Ｐ％≦0.08、Ｓ％≦0.02およびMn％＝0.05〜
1.00である鋼組成の低炭素Alキルド鋼の冷延鋼帯( 板厚
0.6mm ×920mm)を用いた。Embodiments of the present invention will be described below. (Example 1) As a base material for plating, C% = 0.04 to 0.05, Si
% ≦ 0.02, P% ≦ 0.08, S% ≦ 0.02 and Mn% = 0.05 ~
Cold rolled steel strip of low carbon Al-killed steel with a steel composition of 1.00
0.6 mm x 920 mm).
【００２３】これを連続式溶融めっき設備を用いて、下
記に示す条件で溶融めっきを行った。焼鈍炉にはH2、
N2、水蒸気の配管系をそれぞれ独立に設置し、炉内のガ
ス雰囲気および露点は、水素濃度計および露点計で計測
しながら、それぞれの流量を調整することにより制御し
た。This was subjected to hot-dip plating using the continuous hot-dip plating equipment under the following conditions. H 2 for the annealing furnace,
Piping systems for N 2 and water vapor were installed independently of each other, and the gas atmosphere and dew point in the furnace were controlled by adjusting the respective flow rates while measuring with a hydrogen concentration meter and a dew point meter.
【００２４】水素濃度を５vol%と10vol%に調整した２シ
リーズに分けて本発明を実施した。得られた溶融Zn−Al
系合金めっき鋼板についてスパングル粒径を計測した。
結果は、表１ないし表４および図１、図２にまとめて示
す。The present invention was implemented in two series in which the hydrogen concentration was adjusted to 5 vol% and 10 vol%. The obtained molten Zn-Al
The spangle particle size of the base alloy plated steel sheet was measured.
The results are shown in Tables 1 to 4 and FIGS. 1 and 2.
【００２５】図１は、水素濃度５vol%の場合についての
表１および表２の結果に基づく鋼板中のMn含有量および
焼鈍炉の加熱帯の露点とスパングル粒径との関係を示す
グラフである。FIG. 1 is a graph showing the relationship between the Mn content in the steel sheet, the dew point in the heating zone of the annealing furnace, and the spangle particle size based on the results in Tables 1 and 2 for a hydrogen concentration of 5 vol%. .
【００２６】図２は、水素濃度10vol%の場合についての
表３および表４の結果に基づく鋼板中のMn含有量および
焼鈍炉の加熱帯の露点とスパングル粒径との関係を示す
グラフである。FIG. 2 is a graph showing the relationship between the Mn content in the steel sheet, the dew point in the heating zone of the annealing furnace, and the spangle particle size based on the results in Tables 3 and 4 for a hydrogen concentration of 10 vol%. .
【００２７】各表のスパングルサイズは次のような基準
によって３段階で評価した。スパングル２、３を合格と
した。 スパングルサイズ＝１：平均スパングル粒径＜0.7 mm スパングルサイズ＝２：0.7 mm≦平均スパングル粒＜1.
0 mm スパングルサイズ＝３：平均スパングル粒径≧1.0 mm めっき表面の実物の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、スパングル粒径(mm)を算出。測定場所は母
材毎に幅方向に６ヶ所、長手方向に20ヶ所の計120 ヶ所
であり、母材毎の平均値を示す。The spangle size in each table was evaluated in three stages based on the following criteria. The spangles 2 and 3 were regarded as passed. Spangle size = 1: average spangle particle size <0.7 mm Spangle size = 2: 0.7 mm <average spangle particle <1.
0 mm spangle size = 3: average spangle particle size ≥ 1.0 mm The number of spangles per 100 mm length is measured using a 2x enlarged photograph of the actual plating surface, and the spangle particle size is determined by [100 / number of spangles]. (mm) is calculated. There are a total of 120 measurement locations, 6 locations in the width direction and 20 locations in the longitudinal direction for each base material, and the average value for each base material is shown.
【００２８】本例における製造条件は次の通りであっ
た。 めっき条件： めっき浴条件：Zn−55％Al−1.6 ％Si 母材サイズ：0.8t×760w mm 、ライン速度：100mpm 連続焼鈍炉の加熱帯の鋼板板温度：750 ℃ 連続焼鈍炉の雰囲気中の水素濃度＝５vol%、10vol% めっき浴の温度：600 ℃、めっき後の冷却速度：20℃/s
ec めっき付着量：片面８０ｇ／ｍ２ The manufacturing conditions in this example were as follows. Plating conditions: Plating bath conditions: Zn-55% Al-1.6% Si Base material size: 0.8t x 760wmm, line speed: 100mpm Temperature of steel plate in heating zone of continuous annealing furnace: 750 ° C In atmosphere of continuous annealing furnace Hydrogen concentration = 5vol%, 10vol% Plating bath temperature: 600 ° C, cooling rate after plating: 20 ° C / s
ec Plating weight: 80 g / m 2 on one side
【００２９】[0029]
【表１】 [Table 1]
【００３０】[0030]
【表２】 [Table 2]
【００３１】[0031]
【表３】 [Table 3]
【００３２】[0032]
【表４】 [Table 4]
【００３３】[0033]
【発明の効果】本発明により、めっき浴への成分添加等
に依らず、めっき前母材鋼中Mn添加量に応じ、連続焼鈍
炉の雰囲気 (露点と水素濃度) を調整することにより鮮
明なスパングルを有したZn−55％Al合金めっきを得るこ
とが可能となる。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、しかもスパング
ル粒径が安定して大きいことから意匠性が要求される用
途へも外観上有利である。According to the present invention, the atmosphere (dew point and hydrogen concentration) of the continuous annealing furnace can be sharply adjusted according to the amount of Mn added to the base steel before plating, regardless of the addition of components to the plating bath. It is possible to obtain a spangled Zn-55% Al alloy plating. This plated steel sheet has excellent corrosion resistance typified by Zn-55% Al alloy plated steel sheet and good workability to withstand severe bending, and the spangle particle size is stable and large. It is also advantageous in appearance for applications where design is required.
【図１】連続焼鈍炉の雰囲気中の水素濃度５％における
鋼中Mn量および連続焼鈍炉加熱帯の露点とスパングルサ
イズの関係を示すグラフである。FIG. 1 is a graph showing the relationship between the amount of Mn in steel, the dew point of a continuous annealing furnace heating zone, and spangle size at a hydrogen concentration of 5% in the atmosphere of the continuous annealing furnace.
【図２】連続焼鈍炉の雰囲気中の水素濃度10％における
鋼中Mn量および連続焼鈍炉加熱帯の露点とスパングルサ
イズの関係を示すグラフである。FIG. 2 is a graph showing the relationship between the amount of Mn in steel at a hydrogen concentration of 10% in the atmosphere of a continuous annealing furnace, the dew point of a continuous annealing furnace heating zone, and spangle size.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 村上 行夫 和歌山市湊1850番地 住友金属工業株式会 社和歌山製鉄所内 Ｆターム(参考） 4K027 AA02 AA22 AA23 AB15 AB44 AB48 AC12 AC62 AE03 AE25 AE33 AE34 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukio Murakami 1850 Minato, Wakayama City F-term in Sumitomo Metal Industries, Ltd. Wakayama Works (Reference) 4K027 AA02 AA22 AA23 AB15 AB44 AB48 AC12 AC62 AE03 AE25 AE33 AE34
Claims (1)
およびZnおよび不可避的不純物：残量を含んだめっき浴
に鋼板を浸漬してめっき処理を施す溶融Zn−Al系合金め
っき鋼板の製造方法において、めっき処理に先立って、
鋼板を下記(1) 式を満たす条件の雰囲気で連続焼鈍する
ことを特徴とした、めっき表面の平均スパングル粒径が
0.7 mm以上である溶融Zn−Al系合金めっき鋼板の製造方
法。 Ｄh ≧ (0.5H＋15) ln[Mn]＋1.6H−33 ・・・・・(1) Ｄh ：連続焼鈍炉の加熱帯の露点 [℃] Ｈ ：連続焼鈍炉のH2濃度 [vol%] [Mn] ：鋼中Mn wt％(1) Al: 40 to 70 wt%, Si: 0.5 to 5.0 wt%,
And Zn and unavoidable impurities: in a method for producing a hot-dip Zn-Al-based alloy-coated steel sheet in which a steel sheet is immersed in a plating bath containing a residual amount to perform plating, prior to the plating,
The steel sheet is continuously annealed in an atmosphere satisfying the following formula (1).
A method for producing a hot-dip Zn-Al-based alloy plated steel sheet having a thickness of 0.7 mm or more. Dh ≧ (0.5H + 15) ln [Mn] + 1.6H−33 (1) Dh: Dew point of heating zone of continuous annealing furnace [° C] H: H 2 concentration of continuous annealing furnace [vol%] [ Mn]: Mn wt% in steel
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|---|---|---|---|
| JP09652599A JP3367459B2 (en) | 1999-03-19 | 1999-04-02 | Manufacturing method of hot-dip Zn-Al alloy plated steel sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7620699 | 1999-03-19 | ||
| JP11-76206 | 1999-03-19 | ||
| JP09652599A JP3367459B2 (en) | 1999-03-19 | 1999-04-02 | Manufacturing method of hot-dip Zn-Al alloy plated steel sheet |
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| Publication Number | Publication Date |
|---|---|
| JP2000336466A true JP2000336466A (en) | 2000-12-05 |
| JP3367459B2 JP3367459B2 (en) | 2003-01-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008069437A (en) * | 2006-09-15 | 2008-03-27 | Nisshin Steel Co Ltd | Method for producing hot dip galvanized steel sheet suppressive in spangle pattern |
| US7976650B2 (en) * | 2004-10-20 | 2011-07-12 | Arcelor France | Method for production of sheet of austenitic iron/carbon/manganese steel and sheets produced thus |
| CN109072323A (en) * | 2016-04-19 | 2018-12-21 | 安赛乐米塔尔公司 | Method for producing metal coated steel plates |
| JP2021502482A (en) * | 2017-11-08 | 2021-01-28 | アルセロールミタル | Alloyed hot-dip galvanized steel sheet |
-
1999
- 1999-04-02 JP JP09652599A patent/JP3367459B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7976650B2 (en) * | 2004-10-20 | 2011-07-12 | Arcelor France | Method for production of sheet of austenitic iron/carbon/manganese steel and sheets produced thus |
| JP2008069437A (en) * | 2006-09-15 | 2008-03-27 | Nisshin Steel Co Ltd | Method for producing hot dip galvanized steel sheet suppressive in spangle pattern |
| CN109072323A (en) * | 2016-04-19 | 2018-12-21 | 安赛乐米塔尔公司 | Method for producing metal coated steel plates |
| US11131005B2 (en) | 2016-04-19 | 2021-09-28 | Arcelormittal | Method for producing a metallic coated steel sheet |
| JP2021502482A (en) * | 2017-11-08 | 2021-01-28 | アルセロールミタル | Alloyed hot-dip galvanized steel sheet |
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| Publication number | Publication date |
|---|---|
| JP3367459B2 (en) | 2003-01-14 |
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