JPH08144036A - Production of galvanized steel sheet by using hot rolled steel sheet as base metal - Google Patents

Production of galvanized steel sheet by using hot rolled steel sheet as base metal

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Publication number
JPH08144036A
JPH08144036A JP28680394A JP28680394A JPH08144036A JP H08144036 A JPH08144036 A JP H08144036A JP 28680394 A JP28680394 A JP 28680394A JP 28680394 A JP28680394 A JP 28680394A JP H08144036 A JPH08144036 A JP H08144036A
Authority
JP
Japan
Prior art keywords
steel sheet
hot
base metal
skin pass
galvanized steel
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.)
Granted
Application number
JP28680394A
Other languages
Japanese (ja)
Other versions
JP3257301B2 (en
Inventor
Atsushi Yasui
淳 安井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP28680394A priority Critical patent/JP3257301B2/en
Publication of JPH08144036A publication Critical patent/JPH08144036A/en
Application granted granted Critical
Publication of JP3257301B2 publication Critical patent/JP3257301B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE: To produce a galvanized steel sheet free from blisters with good productivity by subjecting a non-rolled steel sheet base metal to weak oxidizing, reducing and annealing so as to satisfy a relation consisting of a skin pass elongation, nonoxidizing preheating furnace temp. and a reducing furnace temp., then immediately subjecting the base metal to galvanizing. CONSTITUTION: The hot rolled steel sheet base metal is subjected to skin pass and pickling, then to weak oxidizing the surface thereof in a nonoxidizing preheating furnace and, thereafter, its surfaces are reduced in a gaseous hydrogen atmosphere and the base metal is subjected to annealing and galvanizing, by which the galvanized steel sheet is obtd. At this time, the steel sheet is subjected to weak oxidizing, reducing and annealing under the conditions satisfying the skin pass elongation; w(%), the nonoxidizing preheating furnace temp.; x( deg.C) and the reducing furnace temp.; y( deg.C), and y( deg.C)>=0.5x( deg.C) -100w(%)+500x( deg.C)>=450( deg.C), w>=0(%) [the skin pass is not executed at the time of w=0(%)]. Thereafter, the base metal is immediately subjected to the galvanizing. Consequently, the galvanized steel sheet which has which coating weight and is excellent in blister resistance is obtd.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、溶融亜鉛めっき鋼板の
製造方法に関するものであり、熱延鋼板に厚目付の溶融
亜鉛めっきを施したときに発生するブリスターを完全に
防止しようとするものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hot-dip galvanized steel sheet, which is intended to completely prevent blisters generated when hot-dip galvanizing a hot-rolled steel sheet. is there.

【0002】[0002]

【従来の技術】従来、連続式溶融めっきラインによって
製造される亜鉛めっき鋼板は、亜鉛めっき工程の前処理
として水素−窒素混合ガス中で鋼板表面の還元と焼鈍が
同時に行われる。
2. Description of the Related Art Conventionally, in a galvanized steel sheet produced by a continuous hot dip galvanizing line, reduction and annealing of the steel sheet surface are simultaneously performed in a hydrogen-nitrogen mixed gas as a pretreatment for a galvanizing step.

【0003】近年、冷間圧延工程を省略できるメリット
があるため製造工程の合理化を目的に、熱延板に直接溶
融めっきする方法が広まったが、熱延板を溶融亜鉛めっ
きラインに通板した場合、還元のために炉内に吹き込ん
でいる水素が鋼中に吸蔵され、めっき後表層に拡散し、
めっき層と鉄母材との間に、ブリスタと称する空洞が生
じることがよく知られている。
In recent years, a method of hot-dip galvanizing directly on a hot-rolled sheet has been widespread for the purpose of streamlining the manufacturing process because it has the advantage of omitting the cold-rolling step, but the hot-rolled sheet was passed through a hot-dip galvanizing line. In this case, hydrogen blown into the furnace for reduction is occluded in the steel and diffuses to the surface layer after plating,
It is well known that a cavity called a blister is formed between the plated layer and the iron base material.

【0004】こうした、ブリスタを防止する方法とし
て、以下にまとめて示すように、これまでにも数多く提
案されてきた。特開昭49−14325 号公報には、めっき浴
に、S,Se,P,As,Te,Sb,Bi等を添加する方法が開示されて
いるが、この方法では、浴添加成分による耐食性等への
影響が懸念され、また、この様な微量添加成分の浴中濃
度管理は困難であるため好ましくない。
As a method for preventing such blister, a number of methods have been proposed so far, as summarized below. Japanese Unexamined Patent Publication No. 49-14325 discloses a method of adding S, Se, P, As, Te, Sb, Bi, etc. to a plating bath. It is not preferable because there is a concern that it will affect the product, and it is difficult to control the concentration of such a trace amount additive component in the bath.

【0005】特開昭55−119159号公報には、浴中有効Al
濃度を0.20%から0.25%の間で操業する方法が開示され
ているが、この方法では、Al濃度の増加にともない不め
っき等が発生しやすくなる欠点があり好ましくない。
Japanese Patent Application Laid-Open No. 55-119159 discloses effective Al in a bath.
Although a method of operating the concentration between 0.20% and 0.25% is disclosed, this method is not preferable because there is a drawback that non-plating or the like is likely to occur as the Al concentration increases.

【0006】また、特公昭55−17101 号公報には、熱延
鋼材の表面を機械的に脱スケールし、表面酸化後還元
し、めっきする方法が示されているが、表面の機械的な
脱スケールは手間を要し、また、表面に疵等の欠陥が生
じる可能性があるため好ましくない。
Further, Japanese Patent Publication No. 55-17101 discloses a method of mechanically descaling the surface of a hot-rolled steel material, oxidizing the surface and then reducing it, and plating the surface. The scale is not preferable because it requires labor and may cause defects such as flaws on the surface.

【0007】特公昭58−53715 号公報には、めっき後加
熱し、3 〜20μm の合金層を成長させる方法が開示され
ているが、この方法では、めっきの密着性が低下してし
まうため、製造後加工を施される製品には好ましくな
い。
Japanese Patent Publication No. 58-53715 discloses a method of heating after plating to grow an alloy layer having a thickness of 3 to 20 μm. However, this method reduces the adhesion of the plating, Not preferred for products that are post-manufactured.

【0008】さらに、特開平1−316444号公報にはめっ
き浴中のAl濃度(CAl(%))、浴温(TB(℃))、めっ
き前鋼板温度 (TS(℃))を f1(CAl) +f2(TB ) +f3(TS ) ≦ 260 但し、 f1(CAl) =−1278.2×CAl+304.2 f2(TB ) =0.94×TB −356.2 f3(TS ) =0.41×TS −118.9 を満たす条件で操業することによりブリスタの発生を抑
制できることが開示されているが、本発明者らの知見で
は、無酸化炉温度や、均熱温度条件によっては、ブリス
タが発生してしまい充分とは言えなかった。
Furthermore, Al concentration in the plating bath in Japanese Patent Laid-Open No. 1-316444 (CAl (%)), bath temperature (T B (℃)), pre-coated steel sheet temperature (T S (℃)) and f 1 (C Al ) + f 2 (T B ) + f 3 (T S ) ≦ 260 However, f 1 (C Al ) = − 1278.2 × C Al +304.2 f 2 (T B ) = 0.94 × T B −356.2 f Although it is disclosed that the operation of blisters can be suppressed by operating under the condition of 3 (T S ) = 0.41 × T S −118.9, the inventors of the present invention have found that the non-oxidizing furnace temperature and the soaking temperature are Depending on the conditions, blisters were generated, which was not sufficient.

【0009】また、特開昭56−163250号公報には鋼板中
にBおよびNを添加する方法が、特開昭59−166692号公
報には鋼板中にBまたはTiを添加する方法が、そして特
開平5−295483号公報には、鋼板中にTiを添加する方法
がそれぞれ開示されているが、いずれも母材中への元素
添加は小ロット生産ではコスト高となり、ロットを集約
しなければならないため生産性も低下するため好ましく
なかった。
Further, JP-A-56-163250 discloses a method of adding B and N into a steel sheet, and JP-A-59-166692 discloses a method of adding B or Ti into a steel sheet. Japanese Unexamined Patent Publication No. 5-295483 discloses a method of adding Ti to a steel sheet, but in both cases, the addition of elements to the base material is costly in small-lot production, and lots must be aggregated. Since this is not the case, productivity is also reduced, which is not preferable.

【0010】[0010]

【発明が解決しようとする課題】このように、熱延板に
亜鉛めっきを施した場合に生じるブリスタを防止する方
法については、従来から多数の提案がみられるが、いず
れも不利・欠点があり、熱延鋼板をめっき原板とした場
合、生産性を下げずにブリスタの無い溶融亜鉛めっき鋼
板は製造できなかった。かくして、本発明の目的は、熱
延鋼板をめっき原板として用い、ブリスタの無い溶融亜
鉛めっき鋼板を生産性よく製造できる方法を提供するこ
とである。
As described above, many proposals have been made in the past for the method of preventing the blister generated when the hot-rolled sheet is galvanized, but each of them has disadvantages and drawbacks. When a hot-rolled steel sheet was used as a plating base sheet, a galvanized steel sheet without blisters could not be produced without lowering productivity. Thus, an object of the present invention is to provide a method for producing a blister-free hot-dip galvanized steel sheet with high productivity by using a hot-rolled steel sheet as a plating base sheet.

【0011】[0011]

【課題を解決するための手段】上記課題を解決するた
め、本発明者が鋭意、実験、研究を重ねた結果、ある一
定の条件下でのスキンパス、予熱、そして還元を行うこ
とによって完全にブリスタの発生を抑制できる溶融亜鉛
めっき鋼板が製造できることを知り、本発明を完成し
た。
In order to solve the above problems, the inventors of the present invention have earnestly conducted experiments and researches, and as a result, skin blistering, preheating, and reduction under certain conditions are performed to completely eliminate blister. The present invention has been completed, knowing that a hot-dip galvanized steel sheet capable of suppressing the occurrence of the phenomenon can be manufactured.

【0012】ここに、本発明の要旨とするところは、熱
延鋼板原板にスキンパスを施し、酸洗して、表面を無酸
化予熱炉で弱酸化し、次いで水素ガス雰囲気で表面を還
元、焼鈍し、さらに溶融亜鉛めっきを施す方法であっ
て、スキンパス伸率:w(%)、無酸化予熱炉温度:x
(℃)、還元炉温度:y(℃)としたとき y(℃)≧1/2x(℃)−100w(%)+500 x≧450 (℃)、w≧0(%) (ただしw=0(%)のとき、スキンパスは施さないも
のとする。)を満たす温度でスキンパス、弱酸化および
還元、焼鈍を行い、直ちに溶融亜鉛めっきを施すことを
特徴とする熱延鋼板溶融亜鉛めっき鋼板の製造方法であ
る。
Here, the gist of the present invention is that a hot-rolled steel sheet raw material is skin-passed, pickled, the surface is weakly oxidized in an oxidation-free preheating furnace, and then the surface is reduced and annealed in a hydrogen gas atmosphere. , A method of further hot-dip galvanizing, skin pass elongation: w (%), non-oxidizing preheating furnace temperature: x
(° C.) and reduction furnace temperature: y (° C.) y (° C.) ≧ 1/2 x (° C.)-100w (%) + 500 x ≧ 450 (° C.), w ≧ 0 (%) (where w = 0 (%), No skin pass is applied.) Manufacture of hot-rolled galvanized steel sheet characterized by performing hot-dip galvanizing immediately after performing skin pass, weak oxidation and reduction, and annealing at a temperature satisfying Is the way.

【0013】[0013]

【作用】次に、本発明の作用について詳細に説明する。
まず、本発明によれば、その前提としては熱延鋼板原板
にスキンパスを施さず(伸率w=0(%))、酸洗し
て、表面を無酸化予熱炉で弱酸化し、ついで水素ガス雰
囲気で表面を還元、焼鈍し、次いでさらに溶融亜鉛めっ
きを施すが、このような一連の処理操作を経て行う熱延
鋼板の溶融亜鉛めっき方法は、それ自体すでに新規な内
容を有しており、本発明においてはさらに方法におい
て、上記一連の処理操作において、無酸化予熱炉温度:
x(℃)、還元炉温度:y(℃)としたとき y(℃)≧ (1/2) x(℃)+500(℃)、ただし
x≧450 (℃) を満たす温度で弱酸化および還元、焼鈍を行う。
Next, the operation of the present invention will be described in detail.
First, according to the present invention, as its premise, the hot-rolled steel sheet raw plate is not subjected to skin pass (elongation w = 0 (%)), is pickled, and the surface is weakly oxidized in a non-oxidizing preheating furnace, and then hydrogen gas is used. The surface is reduced in an atmosphere, annealed, and then hot-dip galvanizing is further performed, but the hot-dip galvanizing method of the hot-rolled steel sheet performed through such a series of treatment operations already has new contents, In the method according to the present invention, the oxidation-free preheating furnace temperature in the above series of treatment operations is:
x (° C), reduction furnace temperature: y (° C) y (° C) ≥ (1/2) x (° C) + 500 (° C), but weak oxidation and reduction at a temperature satisfying x ≥ 450 (° C) , Perform annealing.

【0014】この理由は、無酸化炉で生成する酸化被膜
の厚みは、無酸化予熱炉温度の上昇により増加するが、
鋼板中には一般にAlが含まれるため、この酸化被膜中に
は酸化鉄の他に微量のアルミナが含まれることになる。
アルミナは難還元性であるため無酸化炉温度を上昇させ
た場合、還元炉温度も上昇させなければ完全に表面のア
ルミナが除去しきれない。表面にアルミナが残った状態
で溶融めっきを施すとめっき密着性が低下するためブリ
スタが発生する。
The reason for this is that the thickness of the oxide film formed in the non-oxidizing furnace increases as the temperature of the non-oxidizing preheating furnace increases,
Since the steel sheet generally contains Al, this oxide film contains a trace amount of alumina in addition to iron oxide.
Since alumina is difficult to reduce, when the temperature of the non-oxidizing furnace is increased, the surface alumina cannot be completely removed unless the temperature of the reducing furnace is also increased. When hot dip coating is performed with alumina remaining on the surface, plating adhesion is reduced and blister occurs.

【0015】これを解決するために筆者らが種々検討を
試みた結果、無酸化予熱炉温度:x(℃)、還元炉温
度:y(℃)としたとき y(℃)≧1/2x(℃)+500(℃) x≧450 (℃) を満たす条件であればブリスタも発生が抑制できること
を見い出した。
As a result of various investigations by the authors in order to solve this, when the non-oxidizing preheating furnace temperature is x (° C.) and the reducing furnace temperature is y (° C.), y (° C.) ≧ 1 / 2x ( It has been found that the occurrence of blisters can be suppressed under the condition of satisfying (° C) + 500 (° C) x ≥ 450 (° C).

【0016】ただし、無酸化炉温度が450 ℃以下だと表
面の不純物(C等)を完全に酸化消滅しきれずめっき不
良が発生する。このため、無酸化炉温度の条件をx≧45
0 (℃)とする。無酸化炉温度(x) の高い方は特に規定
しないが、750 ℃以上だと厚く生成したアルミナ層が完
全に還元しきれないため、スケール過多となる。
However, if the temperature of the non-oxidizing furnace is 450 ° C. or less, impurities (C, etc.) on the surface cannot be completely oxidized and disappeared, resulting in defective plating. Therefore, the condition of non-oxidizing furnace temperature is x ≧ 45
0 (° C). The higher non-oxidizing furnace temperature (x) is not specified, but if the temperature is 750 ° C or higher, the thick alumina layer cannot be completely reduced, resulting in excessive scale.

【0017】一方、還元炉温度は特に規定しないが、下
限はy≧(1/2)x+500(℃)から制約をうける。上
限は特に制限されないが、850 ℃ぐらいがコスト的にも
品質的にも安定して製造できる好適上限となる。
On the other hand, the reduction furnace temperature is not particularly specified, but the lower limit is restricted by y ≧ (1/2) x + 500 (° C.). The upper limit is not particularly limited, but about 850 ° C. is a preferable upper limit for stable production in terms of cost and quality.

【0018】ブリスタの抑制は、上記の操業範囲中であ
れば完全であるが、酸洗前の熱延鋼板原板にスキンパス
を施すことによりブリスタの発生しない安定製造領域の
拡大を図ることができ、より好ましい。
The suppression of blister is complete within the above operating range, but by applying a skin pass to the hot-rolled steel sheet raw sheet before pickling, it is possible to expand the stable production area in which blister does not occur. More preferable.

【0019】従来より、冷間圧延した材料を溶融亜鉛め
っきした場合にはブリスタが発生しないことがよく知ら
れているが、この理由は、冷間圧延した場合、鋼中にボ
イドが形成され、そこに溶融亜鉛めっきライン内で吸蔵
された水素がトラップされてブリスタの発生が抑制され
ると考えられているが、従来の知見であれば、ブリスタ
を完全に抑制するためには、伸率で5%以上の圧下を加
えなければならず、冷延鋼板として製造せざるを得なか
った。しかし、本発明者らの知見によれば、無酸化予熱
炉温度や還元炉温度の条件と組み合わせることで冷間圧
延の工程を省略でき、さらに冷間圧延の製造工程を熱間
圧延後のスキンパスで代用することで、ブリスタの発生
しない安定製造領域の拡大が行えることを見い出した。
It is conventionally well known that blisters do not occur when hot-dip galvanizing a cold-rolled material. The reason is that when cold-rolled, voids are formed in the steel. It is considered that the hydrogen occluded in the hot dip galvanizing line is trapped therein and the occurrence of blisters is suppressed, but the conventional knowledge is that in order to completely suppress blisters, the elongation A reduction of 5% or more had to be applied, and the steel sheet had to be manufactured as a cold rolled steel sheet. However, according to the knowledge of the present inventors, the cold rolling step can be omitted by combining it with the conditions of the non-oxidizing preheating furnace temperature and the reducing furnace temperature, and the cold rolling manufacturing step can be performed by a skin pass after the hot rolling. It was found that by substituting in, the stable manufacturing area without blister can be expanded.

【0020】すなわち、本発明は、このような観点から
云えば、熱延鋼板の溶融亜鉛めっきに際して、ブリスタ
の発生を防止する方法ということができ、それによれ
ば、ブリスタの発生しない安定製造領域の下限は熱延鋼
板原板にスキンパスを施したときには、スキンパスの伸
率を:w(%)、無酸化予熱炉温度:x(℃)、還元炉
温度:y(℃)としたとき y(℃)≧1/2x(℃)−100w(%)+500 x≧450 (℃)w≧0(%) (ただしw=0(%)のとき、スキンパスは施さないも
のとする。)で表せる領域まで拡大することができる。
That is, from the above viewpoint, the present invention can be said to be a method of preventing the formation of blisters during hot dip galvanizing of hot-rolled steel sheets, and according to this method, a stable manufacturing area where blisters do not occur can be obtained. As for the lower limit, when a hot-rolled steel plate is skin-passed, the elongation of the skin-pass is: w (%), non-oxidizing preheating furnace temperature: x (° C), reduction furnace temperature: y (° C) y (° C) ≧ 1/2 x (° C) -100w (%) +500 x ≧ 450 (° C) w ≧ 0 (%) (However, when w = 0 (%), skin pass is not applied.) can do.

【0021】圧下率の上限は特に規定しないが、スキン
パスで圧下する都合上伸率で3%程度が上限になる。こ
れにより、冷圧下の製造工程を省略あるいはスキンパス
で代用することができ、著しい製造コストの合理化が可
能である。
The upper limit of the rolling reduction is not particularly specified, but the upper limit is about 3% in terms of the reduction due to the skin pass. As a result, the manufacturing process under cold pressure can be omitted or a skin pass can be substituted, and significant manufacturing cost can be rationalized.

【0022】なお、本発明において対象となる熱延鋼板
の鋼組成は何ら制限されないが、代表的例を示せば次の
通りである。 C:0.003 〜0.18%、Si:1.2 %以下、Mn:2.0 %以
下、P:0.12%以下、S:0.02%以下、sol.Al:0.1 %
以下、N:0.010 %以下 ここに、このように鋼組成を限定する理由は次の通りで
ある。
Although the steel composition of the hot-rolled steel sheet to which the present invention is applied is not limited at all, typical examples are as follows. C: 0.003 to 0.18%, Si: 1.2% or less, Mn: 2.0% or less, P: 0.12% or less, S: 0.02% or less, sol.Al: 0.1%
Hereinafter, N: 0.010% or less The reason for limiting the steel composition in this way is as follows.

【0023】C:Cは鋼板の強度を確保する作用を有し
ているが、その含有量が0.003 %未満では前記作用によ
る所望の効果が得られず、一方、0.18%を超えて含有さ
せると溶接性の劣化を招くことから、C含有量は0.003
〜0.18%が好ましい。
C: C has the function of ensuring the strength of the steel sheet, but if the content is less than 0.003% the desired effect due to the above effects cannot be obtained, while if it exceeds 0.18% it is contained. C content is 0.003 because it causes deterioration of weldability.
0.18% is preferable.

【0024】Si:Siは固溶強化を通して鋼板の強度と延
性を向上させる成分である。しかし、1.2 %を超えて含
有量させると溶接性の劣化を招くことから、Si含有量は
1.2 %以下が好ましい。
Si: Si is a component that improves the strength and ductility of the steel sheet through solid solution strengthening. However, if the content exceeds 1.2%, the weldability deteriorates, so the Si content is
1.2% or less is preferable.

【0025】Mn:Mnは固溶強化を通して鋼板の強度と延
性を向上させる好ましい元素である。しかし、2.0 %を
超えて含有させると溶接性の劣化を招く上、加工性など
も劣化するためMn含有量は2.0 %以下が好ましい。
Mn: Mn is a preferable element that improves the strength and ductility of the steel sheet through solid solution strengthening. However, if the content exceeds 2.0%, the weldability is deteriorated and the workability is deteriorated. Therefore, the Mn content is preferably 2.0% or less.

【0026】P:Pは0.12%を超えて含有させると母材
の靱性・穴拡げ性を劣化させる。従って、P含有量は0.
12%以下が好ましい。
P: If P is contained in excess of 0.12%, the toughness and hole expandability of the base material deteriorate. Therefore, the P content is 0.
12% or less is preferable.

【0027】S:SはMnS系介在物を形成して加工性を
低下させる不純物元素である。従って、前記弊害を回避
するため、S含有量は0.02%以下が好ましい。
S: S is an impurity element that forms MnS-based inclusions and deteriorates workability. Therefore, in order to avoid the adverse effects, the S content is preferably 0.02% or less.

【0028】sol.Al:Alは鋼の脱酸剤として添加される
が、sol.Alとして0.10%を超えて含有させるとアルミナ
系介在物の量が多くなって加工性を劣化させる。従っ
て、Alの添加量はsol.Al含有量で0.10%以下が好まし
い。
Sol.Al: Al is added as a deoxidizing agent for steel, but if the content of sol.Al exceeds 0.10%, the amount of alumina inclusions increases and the workability deteriorates. Therefore, the added amount of Al is preferably 0.10% or less in terms of sol.Al content.

【0029】N:Nは本発明鋼にとって本質的に有害な
元素であり、0.010 %以下が好ましい。次に、本発明の
作用効果について実施例によりさらに具体的に詳述す
る。
N: N is an element which is essentially harmful to the steel of the present invention, and is preferably 0.010% or less. Next, the function and effect of the present invention will be described more specifically by way of examples.

【0030】[0030]

【実施例】本例では、塩酸酸洗で脱スケールされた表1
の組成の熱延鋼板にスキンパスを施し(一部のサンプル
は施さずに)、酸洗後、ゼンジマー式溶融亜鉛めっきラ
インにおいて所定の温度で無酸化予熱炉および還元炉を
通板し、その後直ちに大気中に出ることなく表2に示し
た成分系のめっき浴で溶融亜鉛めっきを施した。
EXAMPLES In this example, Table 1 descaled by hydrochloric acid pickling
After hot-rolling the hot-rolled steel sheet having the composition of No.1 (without applying some samples), pickling it, and then passing it through a non-oxidizing preheating furnace and a reducing furnace at a predetermined temperature in a Zenzimer hot-dip galvanizing line, and immediately thereafter. Hot dip galvanizing was performed in a plating bath of the component system shown in Table 2 without exposing to the atmosphere.

【0031】次に、このようにして得られた溶融亜鉛め
っき鋼板は、大気中においてガスワイピングされ、亜鉛
付着量として片面100 〜200g/m2 に制御され、水冷乾燥
し、製品とした。
Next, the hot-dip galvanized steel sheet thus obtained was subjected to gas wiping in the atmosphere, the amount of zinc deposited was controlled to 100 to 200 g / m 2 on one side, and water-cooled and dried to obtain a product.

【0032】ブリスタの判定は、めっき後約1週間放置
した後、目視により判定した。熱間圧延後のスキンパス
を省略した結果を図1に、伸率0.5 %のスキンパスを圧
下した結果を図2に、伸率1%のスキンパスを圧下した
結果を図3にそれぞれ示す。
The blister was evaluated by visually observing it after leaving it for about 1 week after plating. The result of omitting the skin pass after hot rolling is shown in FIG. 1, the result of reducing the skin pass having the elongation of 0.5% is shown in FIG. 2, and the result of reducing the skin pass having the elongation of 1% is shown in FIG.

【0033】図1〜3の結果から明らかなように、本発
明にかかる方法で製造した溶融亜鉛めっき鋼板において
は、各実施例の全てのめっき層にブリスタの発生はみら
れないが、本発明例以外の全ての領域では、多かれ少な
かれブリスタの発生が認められた。
As is apparent from the results of FIGS. 1 to 3, in the hot-dip galvanized steel sheet produced by the method according to the present invention, no blister is found in all the plated layers in each example, but the present invention In all areas except the examples, more or less blister formation was observed.

【0034】[0034]

【表1】 [Table 1]

【0035】[0035]

【表2】 [Table 2]

【0036】[0036]

【発明の効果】以上説明したように、本発明によれば、
耐ブリスタ性の優れた厚目付の亜鉛めっき鋼板を、前処
理及び後処理条件の制約を受けることなく、低コストで
連続式溶融亜鉛めっきラインで製造することが可能とな
ることから、外観が美しい溶融亜鉛めっき鋼板が得られ
る。
As described above, according to the present invention,
The galvanized steel sheet with excellent blister resistance and thick weight can be manufactured at the continuous hot-dip galvanizing line at low cost without being restricted by the pretreatment and posttreatment conditions. A hot-dip galvanized steel sheet is obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例の結果を示すグラフである。FIG. 1 is a graph showing the results of Examples.

【図2】実施例の結果を示すグラフである。FIG. 2 is a graph showing the results of Examples.

【図3】実施例の結果を示すグラフである。FIG. 3 is a graph showing the results of Examples.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 熱延鋼板原板にスキンパスを施し、これ
を酸洗して、表面を無酸化予熱炉で弱酸化し、ついで水
素ガス雰囲気で表面を還元、焼鈍し、さらに溶融亜鉛め
っきを施す溶融亜鉛めっき鋼板の製造方法であって、ス
キンパス伸率をw(%)、無酸化予熱炉温度:x
(℃)、還元炉温度:y(℃)としたとき y(℃)≧ 0.5x(℃)−100w(%)+500 x≧450 (℃)、w≧0(%) (ただしw=0(%)のときはスキンパスは施さないも
のとする。)を満たす条件で弱酸化および還元、焼鈍を
行い、直ちに溶融亜鉛めっきを施すことを特徴とする溶
融亜鉛めっき鋼板の製造方法。
1. A hot-rolled steel sheet is skin-passed, pickled, weakly oxidized in a non-oxidizing preheating furnace, then reduced and annealed in a hydrogen gas atmosphere, and then hot-dip galvanized. A method for manufacturing a galvanized steel sheet, wherein the skin pass elongation is w (%), and the oxidation-free preheating furnace temperature is x.
(° C.), reduction furnace temperature: y (° C.) y (° C.) ≧ 0.5 x (° C.)-100w (%) + 500 x ≧ 450 (° C.), w ≧ 0 (%) (where w = 0 ( %), No skin pass is applied.) A method for producing a hot-dip galvanized steel sheet, which comprises performing weak oxidation, reduction, and annealing under conditions satisfying the condition (3), and immediately performing hot-dip galvanizing.
JP28680394A 1994-11-21 1994-11-21 Manufacturing method of hot-dip galvanized steel sheet from hot-rolled steel sheet Expired - Lifetime JP3257301B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28680394A JP3257301B2 (en) 1994-11-21 1994-11-21 Manufacturing method of hot-dip galvanized steel sheet from hot-rolled steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28680394A JP3257301B2 (en) 1994-11-21 1994-11-21 Manufacturing method of hot-dip galvanized steel sheet from hot-rolled steel sheet

Publications (2)

Publication Number Publication Date
JPH08144036A true JPH08144036A (en) 1996-06-04
JP3257301B2 JP3257301B2 (en) 2002-02-18

Family

ID=17709255

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3257301B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010525174A (en) * 2007-05-02 2010-07-22 コラス・スタール・ベー・ブイ Method for hot dip galvanizing of AHSS or UHSS strip material and such material
JP2014181351A (en) * 2013-03-18 2014-09-29 Nisshin Steel Co Ltd Production method of plated steel sheet
EP2927343A1 (en) * 2014-03-31 2015-10-07 Primetals Technologies Austria GmbH Installation and method for pickling and metal coating of a metal strip
WO2015149960A1 (en) * 2014-03-31 2015-10-08 Primetals Technologies Austria GmbH Equipment and process for the pickling and metallic coating of a metal strip

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010525174A (en) * 2007-05-02 2010-07-22 コラス・スタール・ベー・ブイ Method for hot dip galvanizing of AHSS or UHSS strip material and such material
JP2014181351A (en) * 2013-03-18 2014-09-29 Nisshin Steel Co Ltd Production method of plated steel sheet
EP2927343A1 (en) * 2014-03-31 2015-10-07 Primetals Technologies Austria GmbH Installation and method for pickling and metal coating of a metal strip
WO2015149960A1 (en) * 2014-03-31 2015-10-08 Primetals Technologies Austria GmbH Equipment and process for the pickling and metallic coating of a metal strip
CN113846281A (en) * 2014-03-31 2021-12-28 克莱西姆股份公司 Device and method for pickling and coating metal strips

Also Published As

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