JPH06207259A - Manufacture of galvanized high tensile strength steel sheet - Google Patents
Manufacture of galvanized high tensile strength steel sheetInfo
- Publication number
- JPH06207259A JPH06207259A JP263093A JP263093A JPH06207259A JP H06207259 A JPH06207259 A JP H06207259A JP 263093 A JP263093 A JP 263093A JP 263093 A JP263093 A JP 263093A JP H06207259 A JPH06207259 A JP H06207259A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- strength steel
- organic acid
- hot
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は主として自動車材料用の
４５kg/mm2以上の高張力を有する溶融亜鉛めっき高張力
鋼板および合金化溶融亜鉛めっき高張力鋼板の製造方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip galvanized high-strength steel sheet having a high tensile strength of 45 kg / mm 2 or more and a method for producing an alloyed hot-dip galvanized high-strength steel sheet mainly for automobile materials.
【０００２】[0002]
【従来の技術】合金化溶融亜鉛めっき鋼板は優れた塗装
後耐食性を有しているために、自動車車体の内板、外
板、構造部品などの自動車材料に広く使用されている。
合金化溶融亜鉛めっき鋼板の製法としては各種あるが、
コスト、生産能率のためにライン内焼鈍方式が主流であ
る。ライン内焼鈍方式とは、鋼板材質を得るための焼鈍
と鋼板表面のＦｅ酸化物を還元する焼鈍を兼ねて焼鈍を
行ない、その後溶融亜鉛浴に浸漬することにより溶融亜
鉛めっきし、その後引き上げて付着量制御し、加熱する
ことにより合金化処理してＺｎ−Ｆｅ合金めっきとする
方式である。2. Description of the Related Art Alloyed hot-dip galvanized steel sheets are widely used for automobile materials such as inner plates, outer plates and structural parts of automobile bodies because of their excellent corrosion resistance after painting.
There are various methods for producing alloyed hot-dip galvanized steel sheets,
In-line annealing is the mainstream because of cost and production efficiency. The in-line annealing method is an annealing that combines the annealing for obtaining the steel sheet material and the annealing for reducing the Fe oxide on the steel sheet surface, and then hot dip galvanizing by dipping in a hot dip zinc bath and then pulling up and adhering. This is a system in which the amount is controlled and an alloying treatment is performed by heating to obtain Zn-Fe alloy plating.
【０００３】一方、自動車車体の軽量化のために鉄鋼材
料の高張力化が要求されている。特に、ＣＡＦＥ（米国
における Coporate Average Fuel Economy規制）で自動
車の燃費の向上が要求されたため、そのニーズは強いも
のがある。On the other hand, in order to reduce the weight of automobile bodies, it is required to increase the tensile strength of steel materials. In particular, CAFE (Coporate Average Fuel Economy regulation in the United States) has been required to improve fuel efficiency of automobiles, and therefore there is a strong need for it.
【０００４】従って高張力合金化溶融亜鉛めっき鋼板が
必要となった。高張力化する場合、固溶強化や組織強化
など各種の方法があるが、いずれの方法であってもＦｅ
以外の添加元素が必要であり、それにはＣ，Ｓｉ，Ｍ
ｎ，Ｐ，Ｃｒ，Ｎｉ，Ｍｏ，Ｔｉ，Ｎｂなどがある。こ
れらの内Ｓｉ，Ｍｎ，Ｃｒは著しくめっき性を阻害する
ことを知見した。すなわち、Ｓｉ，Ｍｎ，Ｃｒを１種以
上を合計で１．０ｗｔ％以上添加した高張力鋼板の合金
化溶融亜鉛めっき時に亜鉛めっきが全面を覆わず、地鉄
が露出したままのいわゆる不めっきが発生した。Therefore, a high-strength alloyed hot-dip galvanized steel sheet is needed. In order to increase the tensile strength, there are various methods such as solid solution strengthening and structure strengthening.
Additional elements other than C, Si, M are required.
There are n, P, Cr, Ni, Mo, Ti, Nb and the like. It was found that among these, Si, Mn, and Cr markedly hinder the plating property. That is, when alloying hot-dip galvanizing of a high-strength steel sheet in which one or more kinds of Si, Mn, and Cr are added in a total amount of 1.0 wt% or more, galvanization does not cover the entire surface, and so-called unplating in which the base iron is exposed Occurred.
【０００５】[0005]
【発明が解決しようとする課題】溶融亜鉛めっき時の不
めっきは致命的な欠陥であり、ごく一部でも不めっきが
発生すれば全く製品とはならない。このような高張力鋼
板の溶融亜鉛めっき時の不めっき防止対象としては、例
えば特開昭５７−７０２６８号、同５７−７９１６０
号、同５８−１０４１６３号公報に開示されるように溶
融亜鉛めっき前に鋼板に予めＦｅ系めっきを施すことが
知られている。しかし、このようなＦｅ系めっきを行う
には、大規模なめっき設備が必要となり、経済的ではな
い。The non-plating during hot dip galvanizing is a fatal defect, and if the non-plating occurs even in a very small amount, it cannot be a product at all. Examples of non-plating prevention targets during hot dip galvanizing of such high-strength steel sheets include, for example, JP-A-57-70268 and 57-79160.
No. 58-104163, it is known to apply Fe-based plating to a steel sheet in advance before hot dip galvanizing. However, performing such Fe-based plating requires a large-scale plating facility, which is not economical.
【０００６】本発明は、大規模な設備の追加を必要とす
ることなく、上記の溶融亜鉛めっき時の不めっきの発生
のないＳｉ，Ｍｎ，Ｃｒを１種以上合計で１．０ｗｔ％
以上含有する高張力鋼板の溶融亜鉛めっきおよび合金化
溶融亜鉛めっき方法を提供することを目的とするもので
ある。According to the present invention, one or more kinds of Si, Mn, and Cr that do not cause non-plating during the hot dip galvanizing are 1.0 wt% in total without requiring the addition of large-scale equipment.
It is an object of the present invention to provide a hot-dip galvanizing method and a galvannealing method for a high-strength steel sheet containing the above.
【０００７】[0007]
【課題を解決するための手段】すなわち、本発明は、強
化元素としてＭｎ，Ｓｉ，Ｃｒの内１種以上を合計で
１．０ｗｔ％以上含有する高張力鋼板を母材として合金
化溶融亜鉛めっき鋼板を製造するに際し、該高張力鋼板
表面を有機酸を含有する溶液で処理した後、通常の焼
鈍、溶融亜鉛めっきを行なうことを特徴とする溶融亜鉛
めっき高張力鋼板の製造方法および合金化溶融亜鉛めっ
き高張力鋼板の製造方法を提供するものである。That is, according to the present invention, a high-strength steel sheet containing a total of 1.0 wt% or more of Mn, Si, and Cr as a strengthening element is used as a base material, and an alloyed hot-dip galvanized sheet is used. In producing a steel sheet, after treating the surface of the high-tensile steel sheet with a solution containing an organic acid, ordinary annealing, hot dip galvanizing, a method for producing a hot-dip galvanized high-tensile steel sheet and alloying fusion A method for manufacturing a galvanized high-strength steel sheet is provided.
【０００８】ここで、有機酸を含有する溶液としてはシ
ュウ酸、マロン酸およびマレイン酸の内１種以上を含有
する溶液を用いるのが好ましい。同溶液はさらに含有す
る有機酸の飽和鉄塩を含有していてもよいし、さらにＨ
2 Ｏ2 を１〜５０ｇ／ｌ含有していてもよい。As the solution containing an organic acid, it is preferable to use a solution containing at least one of oxalic acid, malonic acid and maleic acid. The solution may further contain a saturated iron salt of an organic acid, which further contains H 2
2 O 2 may be contained in an amount of 1 to 50 g / l.
【０００９】[0009]
【作用】以下に本発明をさらに詳細に説明する。Ｓｉ，
Ｍｎ，Ｃｒを合計で１．０ｗｔ％以上含有する高張力鋼
板の不めっき発生原因を検討した結果、鋼板表面にＳｉ
Ｏ2 ，ＭｎＯ，Ｃｒ2 Ｏ3 などの酸化物、複合添加の場
合にはＦｅＳｉＯ，ＭｎＳｉＯなどの複合酸化物が著し
く表面濃化しており、地鉄を覆っているためであること
を知見した。また、添加元素の酸化物の表面濃化は材質
を得るための焼鈍時に生成するものであった。The present invention will be described in more detail below. Si,
As a result of examining the cause of non-plating of a high-strength steel sheet containing 1.0 wt% or more of Mn and Cr in total, Si was found
It has been found that the oxides such as O 2 , MnO and Cr 2 O 3 and the composite oxides such as FeSiO and MnSiO in the case of compound addition are significantly concentrated on the surface and cover the base metal. Further, the surface concentration of the oxide of the additional element was generated during the annealing for obtaining the material.
【００１０】従って、焼鈍温度を低くすることや添加元
素の量を低減することにより表面濃化をある程度抑制で
き、不めっきを改善することができる。しかし、この場
合、伸び、ｒ値が劣化し、材質不良となるため、実用的
な方法とはならない。Therefore, the surface concentration can be suppressed to a certain extent and the non-plating can be improved by lowering the annealing temperature and the amount of the additional element. However, in this case, the elongation and the r-value are deteriorated and the material becomes defective, so that it is not a practical method.
【００１１】従って、何らかの方法でＳｉ，Ｃｒ，Ｍｎ
の酸化物の表面濃化を抑制し、不めっきを解消する必要
がある。そこで表面濃化防止処理の観点から鋭意検討し
た結果、本発明に至ったものである。Therefore, Si, Cr, Mn can be obtained by some method.
It is necessary to suppress the surface concentration of the oxide of and to eliminate non-plating. Then, as a result of intensive studies from the viewpoint of surface thickening prevention treatment, the present invention has been achieved.
【００１２】本発明によれば、高張力鋼板表面を予め有
機酸を含有する溶液により処理することにより不めっき
を防止することができる。その理由はＳｉ，Ｍｎ，Ｃｒ
の酸化物の表面濃化を抑制できるからである。According to the present invention, non-plating can be prevented by treating the surface of the high-strength steel sheet with a solution containing an organic acid in advance. The reason is Si, Mn, Cr
This is because the surface concentration of the oxide can be suppressed.
【００１３】鋼板表面を予め有機酸含有溶液で処理する
ことにより鋼板表面に有機酸の鉄塩が生成する。この鉄
塩が鋼板表面に存在することにより、その後の還元焼鈍
時にＳｉ，Ｍｎ，Ｃｒの酸化物の表面濃化が抑制され
る。By pretreating the surface of the steel sheet with a solution containing an organic acid, an iron salt of an organic acid is produced on the surface of the steel sheet. The presence of this iron salt on the surface of the steel sheet suppresses the surface concentration of oxides of Si, Mn, and Cr during the subsequent reduction annealing.
【００１４】有機酸の鉄塩は還元焼鈍時に分解し、最終
的には還元鉄が生成し、有機酸はＣＯ，ＣＯ2 ，Ｈ2 な
どの気体となって揮発する。そのため、鉄塩被膜が、そ
のもの自身が分解されるまで鋼板表面への焼鈍雰囲気か
らの酸素の到達に対するバリヤー機能を果たして鋼中強
化元素が酸化物として、表面に濃化することを抑制する
と同時に、鉄塩の分解した後に生成した還元鉄中にはＳ
ｉ，Ｍｎ，Ｃｒなどの元素が含まれていないため、鋼板
母材中のＳｉ，Ｍｎ，Ｃｒが還元鉄中を拡散する時間が
必要なため、これら元素の濃化が抑制される。従って、
効果的にＳｉ，Ｍｎ，Ｃｒの表面への濃化と不めっきを
防止するためにはある程度の鉄塩被膜量が必要であり、
最低でも０．１g/m2以上、好ましくは０．５g/m2以上、
被膜均一性を得るためには１．０g/m2以上生成するよう
に有機酸による処理を行う必要がある。The iron salt of an organic acid decomposes during reduction annealing, and finally reduced iron is produced, and the organic acid volatilizes as a gas such as CO, CO 2 and H 2 . Therefore, the iron salt coating plays a barrier function against the arrival of oxygen from the annealing atmosphere on the surface of the steel sheet until it is decomposed, and the strengthening element in the steel as an oxide suppresses the concentration on the surface, S is contained in the reduced iron produced after decomposition of the iron salt.
Since elements such as i, Mn, and Cr are not included, it takes time for Si, Mn, and Cr in the steel sheet base material to diffuse in the reduced iron, so that concentration of these elements is suppressed. Therefore,
In order to effectively prevent the concentration of Si, Mn, and Cr on the surface and non-plating, a certain amount of iron salt coating is required,
At least 0.1 g / m 2 or more, preferably 0.5 g / m 2 or more,
In order to obtain coating uniformity, it is necessary to perform treatment with an organic acid so as to produce 1.0 g / m 2 or more.
【００１５】有機酸の種類としては、鋼板表面に鉄塩皮
膜が形成すれば何でもよいのであるが、特にシュウ酸が
効果的である。その他にマロン酸、マレイン酸などの不
溶性の鉄塩を生成する有機酸に効果が認められる。有機
酸含有溶液は上記有機酸を少なくとも１種含有し、さら
に有機酸の飽和鉄塩を含有していてもよい。シュウ酸の
添加量が１０g/m2未満では皮膜形成速度が遅いため効果
的ではない。Any organic acid may be used as long as an iron salt film is formed on the surface of the steel sheet, and oxalic acid is particularly effective. In addition, it is effective for organic acids that produce insoluble iron salts such as malonic acid and maleic acid. The organic acid-containing solution contains at least one of the above organic acids, and may further contain a saturated iron salt of the organic acid. If the amount of oxalic acid added is less than 10 g / m 2 , it is not effective because the film formation rate is slow.
【００１６】また、処理溶液中に鉄が溶出すると、Ｓ
ｉ，Ｃｒ，Ｍｎの酸化物がスマットとして残るために鉄
塩被膜が不良化する場合があり、処理液の鉄塩濃度は飽
和であることが好ましい。When iron is dissolved in the treatment solution, S
Since the oxides of i, Cr, and Mn remain as smuts, the iron salt coating may become defective, and the iron salt concentration of the treatment liquid is preferably saturated.
【００１７】処理温度は室温から１００℃まで使用可能
であるが、５秒程度の短時間処理の場合には６０℃以上
の温度が好ましい。The treatment temperature can be from room temperature to 100 ° C., but in the case of short-time treatment of about 5 seconds, a temperature of 60 ° C. or higher is preferable.
【００１８】ｐＨは特に調整する必要はないが、酸によ
りＦｅイオンの溶出が起こり、そのＦｅイオンが有機酸
により鉄塩となって鋼板表面に析出するのであるから、
ｐＨ０．５〜３．５が適当であり、低すぎると被膜が生
成しにくく、高すぎるとＦｅの溶出が遅くなるためやは
り被膜が生成しにくくなる。短時間で被膜を形成される
ためには、処理溶液中にＨ2 Ｏ2 を１〜５０ｇ／ｌ添加
することが効果的である。例えばＨ2 Ｏ2 を１０〜４０
ｇ／ｌ添加すると約３秒程度で有機酸の鉄塩被膜を形成
させることができる。Although there is no particular need to adjust the pH, the acid causes the elution of Fe ions, and the Fe ions form an iron salt with the organic acid and precipitate on the surface of the steel sheet.
A pH of 0.5 to 3.5 is suitable, and if it is too low, the film is hard to form, and if it is too high, the elution of Fe is delayed, so that the film is hard to form. In order to form a film in a short time, it is effective to add 1 to 50 g / l of H 2 O 2 to the treatment solution. For example, the H 2 O 2 10~40
When g / l is added, an iron salt film of an organic acid can be formed in about 3 seconds.
【００１９】被膜の形成は上記のＦｅイオンの溶出と鉄
塩の析出によって形成されるため、ある一定時間以上で
は形成しなくなり、被膜量は飽和する。処理液の温度が
低く、Ｈ2 Ｏ2 を含まない場合には、処理時間は２０秒
〜１０分が適当であるが、処理液の温度が高く、Ｈ2 Ｏ
2 を含有する場合には、１〜２０秒が適当である。処理
方法として浸漬、スプレー、塗布などいかなる方法によ
ってもよい。Since the film is formed by the elution of Fe ions and the precipitation of iron salt, the film is not formed after a certain period of time and the film amount is saturated. When the temperature of the treatment liquid is low and does not contain H 2 O 2 , the treatment time is suitable to be 20 seconds to 10 minutes, but the temperature of the treatment liquid is high and H 2 O
When it contains 2 , 1 to 20 seconds is suitable. As a treatment method, any method such as dipping, spraying or coating may be used.
【００２０】以上のような有機酸含有溶液による処理を
行った後、処理済の高張力鋼板の還元焼鈍を行なう。こ
のとき、還元焼鈍ラインを汚す恐れがあるので、処理鋼
板の水洗と乾燥を行った方が良い。還元焼鈍は通常のＮ
ＯＦ方式やラジアントチューブ方式で行えばよく、その
雰囲気としては通常のＨ2 が２〜８０％の還元性ガスを
使用できる。焼鈍温度やサイクルは材質によって選択す
れば良く、焼鈍温度が高いとＳｉ，Ｍｎ，Ｃｒなどが濃
化しやすくなるので鉄塩被膜は厚い方が好ましく、特に
８５０℃以上の高温焼鈍では１g/m2以上が好適である。After the treatment with the organic acid-containing solution as described above, the treated high-strength steel sheet is subjected to reduction annealing. At this time, the reduction annealing line may be contaminated, so it is better to wash and dry the treated steel sheet. Reduction annealing is normal N
It may be performed by the OF method or the radiant tube method, and as the atmosphere, a normal reducing gas having H 2 of 2 to 80% can be used. The annealing temperature and cycle may be selected depending on the material. Since the Si, Mn, Cr, etc. tend to be concentrated when the annealing temperature is high, it is preferable that the iron salt film is thick, and especially 1 g / m 2 at high temperature annealing of 850 ° C or higher. The above is suitable.
【００２１】焼鈍により、鉄塩被膜は最終的には完全に
分解され、還元鉄が生成するため、その後の溶融亜鉛め
っきと合金化処理は通常の方法がそのまま適用できる。By the annealing, the iron salt coating is finally completely decomposed and reduced iron is produced, so that the subsequent hot dip galvanizing and alloying treatment can be carried out by the usual methods.
【００２２】還元鉄は通常の軟鋼よりも活性であるが、
その内部はＳｉ，Ｍｎ，Ｃｒなどを含む高張力鋼板であ
るため、わずかに反応性に相違がある。具体的には溶融
亜鉛めっき時に生成するＡｌ富化層がわずかに多くなる
ためと内部のＳｉ，Ｍｎ，Ｃｒ，Ｐなどが存在すること
によりＦｅの拡散速度が遅くなる傾向がある。そこで、
侵入板温をやや高めにするか浴中のＡｌ濃度をわずかに
低目にすることによりＡｌ富化層量を低減させることが
好適である。侵入板温４６０〜６００℃、浴温４５０〜
５００℃、Ａｌ濃度０．０５〜０．２０ｗｔ％が好適で
ある。Although reduced iron is more active than ordinary mild steel,
Since the inside is a high-tensile steel plate containing Si, Mn, Cr, etc., there is a slight difference in reactivity. Specifically, the diffusion rate of Fe tends to be slow because the Al-rich layer produced during hot dip galvanization is slightly increased and the presence of Si, Mn, Cr, P, etc. inside. Therefore,
It is preferable to reduce the amount of the Al-enriched layer by raising the temperature of the penetration plate slightly or making the Al concentration in the bath slightly lower. Penetration plate temperature 460-600 ℃, bath temperature 450-
A temperature of 500 ° C. and an Al concentration of 0.05 to 0.20 wt% are suitable.
【００２３】溶融亜鉛めっき後ワイピングにより付着量
制御した後、加熱により地鉄と亜鉛めっきを相互拡散さ
せて合金化処理し、Ｚｎ−Ｆｅ合金めっきとする。その
際、上記のＡｌ富化層や内部に存在するＳｉ，Ｍｎ，Ｃ
ｒ，Ｐにより合金化速度がやや遅延する傾向があるた
め、合金化温度はやや高目が好ましく、４６０〜６００
℃が好適である。After the hot-dip galvanizing, the amount of adhesion is controlled by wiping, and then the base iron and the zinc plating are mutually diffused by heating and alloyed to obtain a Zn-Fe alloy plating. At that time, Si, Mn, C existing in the Al-rich layer or inside
Since the alloying rate tends to be slightly delayed by r and P, the alloying temperature is preferably a little higher and is 460 to 600.
C is preferred.
【００２４】[0024]
【実施例】以下に本発明を実施例に基づいて具体的に説
明する。 （実施例）表１に示す成分の高張力鋼板に、同じく表１
に示す処理溶液および条件を用いてあるいは溶液を用い
ることなく処理を施し、次いで表１の焼鈍、溶融亜鉛め
っき、合金化処理を行なった。その結果を、強化元素の
表面濃化およびめっき性で評価し、表１に示す。また、
ＧＤＳによる表面濃化の深さ方向の分析結果を図１およ
び図２に示す。図１は表１のＮｏ．５に相当するもの
で、表面濃化防止処理をしていないためにＭｎ，Ｐなど
が表面濃化している。これに対し、図２は表１のＮｏ．
２に相当するもので、表面濃化防止処理をしているから
表面濃化が抑制されているのがわかる。EXAMPLES The present invention will be specifically described below based on examples. (Example) A high-strength steel sheet having the components shown in Table 1 was also used.
The treatment was carried out with or without the treatment solution and conditions shown in Table 1, followed by annealing, hot dip galvanization and alloying treatment shown in Table 1. The results are evaluated by the surface concentration of the strengthening element and the plating property, and shown in Table 1. Also,
The results of surface concentration analysis by GDS in the depth direction are shown in FIGS. 1 and 2. FIG. 1 shows No. 1 in Table 1. This is equivalent to No. 5, and Mn, P, etc. are surface-concentrated because the surface concentration-preventing treatment is not performed. On the other hand, FIG.
It corresponds to 2, and it can be seen that the surface thickening is suppressed because the surface thickening prevention treatment is performed.
【００２５】表面濃化は、ＧＤＳにより測定し、下記の
ように評価した。 ○ ： 表面濃化なし △ ： 表面濃化抑制効果あり × ： 表面濃化抑制効果なしThe surface concentration was measured by GDS and evaluated as follows. ○: No surface thickening △: Surface thickening suppressing effect ×: No surface thickening suppressing effect
【００２６】めっき性は目視により下記の通り評価し
た。 ○ ： 不めっきなし △ ： わずかに不めっきあり × ： 不めっきThe plating property was visually evaluated as follows. ○: Non-plating △: Slightly non-plating ×: Non-plating
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【発明の効果】本発明は表面濃化防止処理を行うので、
通常の焼鈍を行ってもＳｉ，Ｍｎ，Ｃｒの表面濃化が抑
制されるため、不めっきの発生を皆無にすることができ
る。本発明によりＳｉ，Ｍｎ，Ｃｒ，を１％以上含有す
る高張力溶融亜鉛めっき鋼板あるいは合金化溶融亜鉛め
っき鋼板の製造が可能となった。Since the present invention performs the surface thickening prevention treatment,
Even if the normal annealing is performed, the surface concentration of Si, Mn, and Cr is suppressed, so that the occurrence of non-plating can be completely eliminated. According to the present invention, it is possible to manufacture a high-strength hot-dip galvanized steel sheet or an alloyed hot-dip galvanized steel sheet containing 1% or more of Si, Mn, and Cr.
【図１】表面濃化防止処理を施していない高張力鋼板の
焼鈍後の表面濃化を示すＧＤＳによる分析図である。FIG. 1 is a GDS analysis diagram showing the surface concentration after annealing of a high-strength steel sheet that has not been subjected to a surface concentration prevention treatment.
【図２】本発明による表面濃化防止処理を施した高張力
鋼板の焼鈍後の表面濃化抑制を示すＧＤＳによる分析図
である。FIG. 2 is an analysis diagram by GDS showing suppression of surface thickening after annealing of a high-strength steel sheet subjected to a surface thickening prevention treatment according to the present invention.
Claims (5)
以上を合計で１．０ｗｔ％以上含有する高張力鋼板を母
材として合金化溶融亜鉛めっき鋼板を製造するに際し、
該高張力鋼板表面を有機酸を含有する溶液で処理した
後、通常の焼鈍、溶融亜鉛めっきを行なうことを特徴と
する溶融亜鉛めっき高張力鋼板の製造方法。1. When manufacturing an alloyed hot dip galvanized steel sheet using a high-strength steel sheet containing at least 1.0 wt% of Mn, Si, or Cr as a strengthening element in total, as a base material,
A method for producing a hot-dip galvanized high-strength steel sheet, which comprises subjecting the surface of the high-tensile steel sheet to a solution containing an organic acid, followed by ordinary annealing and hot dip galvanizing.
ン酸およびマレイン酸の内１種以上を含む請求項１に記
載の溶融亜鉛めっき高張力鋼板の製造方法。2. The method for producing a hot-dip galvanized high-strength steel sheet according to claim 1, wherein the solution containing an organic acid contains at least one selected from oxalic acid, malonic acid and maleic acid.
有機酸の飽和鉄塩を含有する請求項２に記載の溶融亜鉛
めっき高張力鋼板の製造方法。3. The method for producing a hot-dip galvanized high-strength steel sheet according to claim 2, wherein the solution containing the organic acid further contains a saturated iron salt of the organic acid.
を１〜５０ｇ／ｌ含有する請求項２または３に記載の溶
融亜鉛めっき高張力鋼板の製造方法。4. A solution containing an organic acid further comprises H 2 O 2
The method for producing a hot-dip galvanized high-strength steel sheet according to claim 2 or 3, containing 1 to 50 g / l.
板を合金化処理する合金化溶融亜鉛めっき高張力鋼板の
製造方法。5. A method for producing a galvannealed high-strength steel sheet, which comprises subjecting the hot-dip galvanized steel sheet obtained in any one of claims 1 to 4 to an alloying treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP263093A JPH06207259A (en) | 1993-01-11 | 1993-01-11 | Manufacture of galvanized high tensile strength steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP263093A JPH06207259A (en) | 1993-01-11 | 1993-01-11 | Manufacture of galvanized high tensile strength steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06207259A true JPH06207259A (en) | 1994-07-26 |
Family
ID=11534719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP263093A Withdrawn JPH06207259A (en) | 1993-01-11 | 1993-01-11 | Manufacture of galvanized high tensile strength steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06207259A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010018873A (en) * | 2008-07-14 | 2010-01-28 | Kobe Steel Ltd | Method for producing hot-dip galvannealed steel sheet |
| JP2010156029A (en) * | 2009-01-05 | 2010-07-15 | Nippon Steel Corp | Method for manufacturing hot-dip galvanized high-tensile steel plate |
| JP2010174287A (en) * | 2009-01-28 | 2010-08-12 | Sumitomo Metal Ind Ltd | Washing liquid for hot dip galvanization, pretreatment method of hot dip galvanization, method of manufacturing hot dip galvanized steel sheet and method of manufacturing alloyed hot dip galvanized steel sheet |
| CN109750244A (en) * | 2019-03-25 | 2019-05-14 | 常州大学 | A method of reducing silicon reactivity in hot dip galvanizing of malleable iron |
-
1993
- 1993-01-11 JP JP263093A patent/JPH06207259A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010018873A (en) * | 2008-07-14 | 2010-01-28 | Kobe Steel Ltd | Method for producing hot-dip galvannealed steel sheet |
| JP2010156029A (en) * | 2009-01-05 | 2010-07-15 | Nippon Steel Corp | Method for manufacturing hot-dip galvanized high-tensile steel plate |
| JP2010174287A (en) * | 2009-01-28 | 2010-08-12 | Sumitomo Metal Ind Ltd | Washing liquid for hot dip galvanization, pretreatment method of hot dip galvanization, method of manufacturing hot dip galvanized steel sheet and method of manufacturing alloyed hot dip galvanized steel sheet |
| CN109750244A (en) * | 2019-03-25 | 2019-05-14 | 常州大学 | A method of reducing silicon reactivity in hot dip galvanizing of malleable iron |
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