JPH0293054A - Production of hot dip galvanized steel sheet - Google Patents
Production of hot dip galvanized steel sheetInfo
- Publication number
- JPH0293054A JPH0293054A JP24559088A JP24559088A JPH0293054A JP H0293054 A JPH0293054 A JP H0293054A JP 24559088 A JP24559088 A JP 24559088A JP 24559088 A JP24559088 A JP 24559088A JP H0293054 A JPH0293054 A JP H0293054A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- bath
- alloying
- zinc
- concns
- 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.)
- Pending
Links
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 11
- 239000008397 galvanized steel Substances 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000005275 alloying Methods 0.000 claims abstract description 24
- 239000011701 zinc Substances 0.000 claims description 49
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 48
- 229910052725 zinc Inorganic materials 0.000 claims description 48
- 238000005246 galvanizing Methods 0.000 claims description 15
- 238000007747 plating Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 229910000640 Fe alloy Inorganic materials 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 12
- 238000007664 blowing Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005499 meniscus Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、鋼板の表面と裏面とをそれぞれ独立に溶融
亜鉛めっきを一ラインにおいて行う溶融亜鉛めっき鋼板
の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a hot-dip galvanized steel sheet, in which hot-dip galvanizing is performed independently on the front and back surfaces of the steel sheet in one line.
従来、溶融亜鉛めっき鋼板を製造するには、そのめっき
層の一部、あるいは全体をＦｅ−Ｚｎ合金層とする合金
化処理を行う製造方法が知られている。BACKGROUND ART Conventionally, in order to manufacture hot-dip galvanized steel sheets, a manufacturing method is known in which a part or all of the plating layer is alloyed to form an Fe-Zn alloy layer.
このような合金化処理を行う溶融亜鉛めっき鋼板の製造
方法としては、例えば第４図に示すように、溶融亜鉛め
っき槽４の直上に合金化炉２を配置し、ジンクロール５
によりめっき槽４中に浸漬された鋼板ｌを引上げるとき
、鋼板１表面に付着した溶融亜鉛を絞り取り装置３によ
り亜鉛付着量の調節を行う。この絞り取り装置としては
溝付きロールによる絞り法か高圧ガス吹き付けによる気
体絞り法によるのが一般であって、その後、直ちに合金
化炉２において鋼板１を加熱し、亜鉛層・＼のＦｅの拡
散を行わせるものである。As a method for manufacturing hot-dip galvanized steel sheets that undergoes such alloying treatment, for example, as shown in FIG. 4, an alloying furnace 2 is placed directly above a hot-dip galvanizing tank 4,
When the steel plate l immersed in the plating bath 4 is pulled up, the molten zinc adhering to the surface of the steel plate 1 is squeezed out and the amount of zinc deposited is adjusted by the device 3. This squeezing device generally uses a squeezing method using grooved rolls or a gas squeezing method using high-pressure gas blowing.After that, the steel sheet 1 is immediately heated in the alloying furnace 2, and the Fe in the zinc layer is diffused. It is something that allows people to do this.
しかし、上記の例で行われる合金化処理が適正でない場
合、すなわち、めっき層のＦｅｄ度が高すぎたり（過合
金化）、あるいは低すぎたり（合金化不足）すると、め
っき鋼板の塗装性等に悪影口を及ぼすことになる。However, if the alloying treatment performed in the above example is not appropriate, that is, if the Fed degree of the coating layer is too high (overalloying) or too low (insufficient alloying), the paintability of the plated steel sheet may deteriorate. This will have a negative impact on the
また、近年、特に溶融亜鉛めっき鋼板が自動車用等に多
く使用されるようになり、耐蝕性を向上させるという点
からは亜鉛付着量を多くし、また塗装性の点からはめっ
き層のＦｅ濃度を所望の目標範囲に任意にコントロール
する必要がある。しかし、第４図に示すような一槽の亜
鉛浴にて亜鉛を付着させ、合金化させるための熱処理を
行う場合、付着量を変化させるとめっき層中のＦｅ［度
も変化し、両方を独立して任意に変化させることはでき
なかった。このため、耐蝕性の点から亜鉛付着量の調節
はできても、塗装性の向上を図るためのＦｅ濃度の調節
はできなかった。In addition, in recent years, hot-dip galvanized steel sheets have come into widespread use, especially for automobiles, and from the standpoint of improving corrosion resistance, the amount of zinc deposited must be increased, and from the standpoint of paintability, the Fe concentration of the plating layer must be increased. must be arbitrarily controlled within the desired target range. However, when heat treatment is performed to deposit and alloy zinc in a single zinc bath as shown in Figure 4, changing the amount of zinc deposited will also change the degree of Fe in the plating layer. They could not be changed independently and arbitrarily. For this reason, although it was possible to adjust the amount of zinc deposited from the viewpoint of corrosion resistance, it was not possible to adjust the Fe concentration to improve paintability.
このような技術的背景より、めっき鋼板の耐蝕性、塗装
性を改善する手段として、（１）溶融亜鉛めっき浴面に
塩化物を吹き込んで浴中Ａ１量を低減する方法（特開昭
５３−１３８９３１号公報）（２）溶融亜鉛めっき浴中
に空気又は酸素ガスを吹き込んで浴中Ａｌ量を低減する
方法（特開昭５３−１３８９３２号公報）（３）特定の
めっき浴でめっきした鋼板を一定温度で加熱冷却する方
法（特開昭５０−０１３２２９号公報）等が開示されて
いるが、いずれも耐蝕性、塗装性を支配する表面、裏面
の合金化度を各独立で調節することができない、といっ
た問題点があった。Based on this technical background, as a means to improve the corrosion resistance and paintability of galvanized steel sheets, (1) a method of blowing chloride into the hot-dip galvanizing bath surface to reduce the amount of A1 in the bath (Japanese Patent Laid-Open No. 1983-1999-1) has been proposed. 138931) (2) A method of blowing air or oxygen gas into a hot-dip galvanizing bath to reduce the amount of Al in the bath (Japanese Unexamined Patent Publication No. 138932/1983) A method of heating and cooling at a constant temperature (Japanese Unexamined Patent Publication No. 50-013229) has been disclosed, but in both cases, the degree of alloying on the front and back surfaces, which govern corrosion resistance and paintability, can be adjusted independently. The problem was that it couldn't be done.
この発明は、このような従来の問題点にかんがみてなさ
れたものであって、鋼板の表面用亜鉛浴と裏面用亜鉛浴
とを併設する等により上記問題点を解決することを目的
としている。The present invention has been made in view of these conventional problems, and aims to solve the above problems by providing a zinc bath for the front surface and a zinc bath for the back surface of the steel sheet.
この発明は、鋼板の溶融亜鉛めっきを行うに際して、鋼
板の表面用亜鉛浴と裏面用亜鉛浴とを一ラインに併設し
、鋼板の表面と裏面のそれぞれに対し製品に要求される
合金化度に応じて前記各亜鉛浴中の／ｌ濃度を調整する
ことにより、鋼板の表面、裏面それぞれ独立に亜鉛付着
量、めっき層合金化度を調節することを特徴とする溶融
亜鉛めっき鋼板の製造方法としたものである。When hot-dip galvanizing steel sheets, this invention involves installing a zinc bath for the front surface of the steel sheet and a zinc bath for the back surface of the steel sheet in one line, and adjusting the degree of alloying required for the product on each of the front and back surfaces of the steel sheet. A method for producing a hot-dip galvanized steel sheet, characterized in that the amount of zinc deposited and the degree of alloying of the coating layer are adjusted independently on the front and back surfaces of the steel sheet by adjusting the /l concentration in each zinc bath accordingly. This is what I did.
一般に亜鉛とＦｅの合金化速度はＡｌによって支配され
ることが知られている。したがって、亜鉛浴中には所定
量のＡｌ！が含有されている。この浴中Ａ＃！濃度が異
なると同一の熱処理を行った場合でも鋼板へのＡＡ付着
量が変化するので合金化速度が異なることになり、それ
に応じてめっき層中のＦｅ濃度も異なってくる。It is generally known that the alloying rate of zinc and Fe is controlled by Al. Therefore, in the zinc bath there is a certain amount of Al! Contains. A# in this bath! If the concentration differs, even if the same heat treatment is performed, the amount of AA deposited on the steel sheet will change, resulting in a different alloying rate, and the Fe concentration in the plating layer will also vary accordingly.
本発明は、このＡｌのＺｎ−Ｆｅ合金化に及ぼす効果を
利用して、前記手段、すなわち鋼板の表面用亜鉛浴と裏
面用亜鉛浴とを同一ラインに併設したために、鋼板の表
面５裏面各々に異なるＡｌ濃度をもった亜鉛をめっきし
、その後、合金化処理を行うことにより、めっき層中の
Ｆｅ濃度を表面、裏面独立にコントロールして、耐蝕性
はもちろん、塗装性をも向上させるものである。The present invention takes advantage of the effect of Al on Zn-Fe alloying and provides the above-mentioned means, that is, a zinc bath for the front surface of the steel sheet and a zinc bath for the back surface of the steel sheet, in the same line. By plating zinc with different Al concentrations on the surface and then performing alloying treatment, the Fe concentration in the plating layer can be controlled independently on the front and back surfaces, improving not only corrosion resistance but also paintability. It is.
［実施例］
以下、本発明を図面に基づいて説明する。第１図〜第３
図は本発明に係る一実施例を説明する図である。[Example] The present invention will be described below based on the drawings. Figures 1 to 3
The figure is a diagram illustrating an embodiment according to the present invention.
先ず、第３図に本発明を構成する手段（第１図）を取り
入れた鋼板の亜鉛めっきラインを説明する。First, a galvanizing line for steel sheets incorporating the means constituting the present invention (FIG. 1) will be explained with reference to FIG.
図において、溶融亜鉛めっき用鋼板１はペイオフリール
６より払い出され、その後、せん断機７、溶接機８を通
り、脱脂、酸洗、水洗等を行うクリニングセクション９
を経て焼鈍炉１０へ入り、所定の熱処理が行われ、冷却
帯１１にて均熱、冷却が行われる。そして目標板温とな
って亜鉛めっき装置１２へ入る。この装置１２内で表面
、裏面にそれぞれ所定のＡ１濃度の亜鉛を付着させ、亜
鉛絞り装置３（第１図）にて所定の付着量に調節する。In the figure, a steel sheet 1 for hot-dip galvanizing is discharged from a payoff reel 6, then passes through a shearing machine 7 and a welding machine 8, and a cleaning section 9 where it is subjected to degreasing, pickling, water washing, etc.
The material then enters the annealing furnace 10, where it is subjected to predetermined heat treatment, and soaked and cooled in the cooling zone 11. Then, the plate reaches the target temperature and enters the galvanizing apparatus 12. Zinc with a predetermined concentration of A1 is deposited on the front and back surfaces respectively in this device 12, and the deposited amount is adjusted to a predetermined amount using a zinc squeezing device 3 (FIG. 1).
なお、このとき亜鉛めっき装置１２内はＮ２雰囲気にて
シールされている。Note that at this time, the inside of the galvanizing apparatus 12 is sealed in an N2 atmosphere.
亜鉛めっき装置１２を出た鋼板１は、合金化炉２にて合
金化処理が行われ、その後、冷却帯１３にて所定の温度
まで冷却され、後処理装置１４で化成処理等を施され、
せん断機１５を経てテンションリール１６にて巻取られ
る。The steel sheet 1 leaving the galvanizing device 12 is subjected to alloying treatment in the alloying furnace 2, then cooled to a predetermined temperature in the cooling zone 13, and subjected to chemical conversion treatment etc. in the post-treatment device 14.
It passes through a shearer 15 and is wound up on a tension reel 16.
第１図は亜鉛めっき装置１２の詳細を示したものであっ
て、鋼板１は冷却帯１１からシールロール２１を介して
雰囲気ガスシールチャンバとなっている亜鉛めっき装置
１２に入り、外気を遮断された状態となる。FIG. 1 shows the details of the galvanizing apparatus 12, in which the steel sheet 1 enters the galvanizing apparatus 12, which is an atmospheric gas sealing chamber, from the cooling zone 11 via the seal roll 21, and is blocked from outside air. The state will be as follows.
亜鉛めっき装置１２は予め所定のＡ１濃度に調整した電
気的加熱によるＡ亜鉛浴１７．Ｂ亜鉛浴１８．デフレフ
クロール２３．亜鉛絞り装置３゜出側シールロール２１
より成っている。The zinc plating apparatus 12 uses an A zinc bath 17. which is heated electrically and adjusted to a predetermined A1 concentration in advance. B zinc bath18. Defreef crawl 23. Zinc squeezing device 3゜output side seal roll 21
It consists of
装置１２内へ入った鋼板は、Ｂ亜鉛浴１８面の直上に配
設されたデフレフクロールを介して通過するとき、亜鉛
浴面ば表面張力によるメニスカス２０で鋼板１の片面の
みに接触して亜鉛を付着させ、エア吹き出しノズルのエ
ア噴出量を調節して行う亜鉛絞り装置３にて所定量まで
付着量を絞る。When the steel sheet entering the apparatus 12 passes through the deflation crawl placed directly above the B zinc bath 18 surface, the zinc bath surface contacts only one side of the steel sheet 1 with a meniscus 20 due to surface tension. Zinc is deposited and the amount of deposited is reduced to a predetermined amount by a zinc squeezing device 3 that adjusts the amount of air jetted from an air blowing nozzle.
その後、同様にＡ亜鉛浴１７のメニスカス２０にて反対
側面（裏面）に亜鉛を付着させ、亜鉛絞り装置３にて所
定量まで亜鉛付着量を絞る。以上により鋼板ｌの表面、
裏面それぞれに所定のＡ１濃度の亜鉛をめっきすること
ができた。そして、めっき後、シールロール２１を経て
合金化炉２に入り、合金化処理を受ける。Thereafter, zinc is similarly deposited on the opposite side (back surface) using the meniscus 20 of the A zinc bath 17, and the amount of zinc deposited is reduced to a predetermined amount using the zinc squeezing device 3. As a result of the above, the surface of the steel plate l,
It was possible to plate each back surface with zinc at a predetermined A1 concentration. After plating, the material passes through the seal roll 21 and enters the alloying furnace 2, where it undergoes alloying treatment.
この設備で、所定の亜鉛付着量、めっき層Ｆｅ濃度によ
りＡ亜鉛浴１７．Ｂ亜鉛浴１８のＡ１４度を設定すれば
、鋼板１の表面、裏面それぞれの付着量、めっき層Ｆｅ
濃度を調節することができる。With this equipment, A zinc bath 17. If the A14 degree of the B zinc bath 18 is set, the coating amount on the front and back surfaces of the steel plate 1 and the plating layer Fe
Concentration can be adjusted.
第２図に／ｌのＺｎ−Ｆｅ合金化反応に及ぼす影響をグ
ラフで示す。グラフより、浴中Ａ１濃度が高くなると鋼
板へのＡｌ！付着量が多くなり、その分、Ｆｅ−Ｚｎの
合金化反応が抑制され、亜鉛めっき層中のＦｅｅＡ度が
相対的に減少することがわかる。またこの関係は付着量
が変化することにより影響を受ける。つまり、亜鉛の付
着量が増えることにより、めっき層中のＦｅ’４度はそ
の比率からみて減少する。この関係を利用すれば、鋼板
に要求される耐蝕性により亜鉛付着量を決定し、その付
着量と要求される塗装性によって決まるめっき層中Ｆｅ
：ａ度に応じて亜鉛浴中Ａ １ ？ｔＮ度を調節するこ
とにより耐蝕性、塗装性共に優れためっき鋼板を得るこ
とが可能となる。FIG. 2 graphically shows the influence of /l on the Zn-Fe alloying reaction. From the graph, as the A1 concentration in the bath increases, the amount of Al on the steel plate! It can be seen that as the amount of adhesion increases, the alloying reaction of Fe-Zn is suppressed accordingly, and the degree of FeA in the galvanized layer is relatively reduced. This relationship is also affected by changes in the amount of adhesion. In other words, as the amount of zinc deposited increases, the Fe'4 degree in the plating layer decreases in terms of its ratio. Using this relationship, the amount of zinc deposited can be determined based on the corrosion resistance required of the steel sheet, and the amount of Fe in the plating layer determined by the amount of zinc deposited and the required paintability.
: A 1 in zinc bath depending on a degree? By adjusting the tN degree, it is possible to obtain a plated steel sheet with excellent corrosion resistance and paintability.
第１表に実施例の結果を示す。Table 1 shows the results of the examples.
（上段は実績値、下段は目標値）
第１表
ケース１；表裏面の付着量、Ｆｅ（％）が同じである場
合。(The upper row is the actual value, the lower row is the target value) Table 1 Case 1: When the adhesion amount and Fe (%) on the front and back surfaces are the same.
従来法と本発明による方法の差異なし。There is no difference between the conventional method and the method according to the present invention.
ケース２；付着量が同じで、Ｆｅ（％）の目標値が異な
る場合。Case 2: The amount of adhesion is the same, but the target value of Fe (%) is different.
従来法では表裏面でＡｌ濃度を変化させることができな
いので、Ｆｅ（％）を変化させられないが、本発明では
可能である。In the conventional method, it is not possible to change the Al concentration between the front and back surfaces, so it is not possible to change the Fe (%), but this is possible with the present invention.
ケース３；Ｆｅ（％）目標値が同じで付着量が異なる場
合。Case 3: When the Fe (%) target value is the same but the amount of adhesion is different.
従来法では、Ｆｅ（％）を同じにすることができない。In the conventional method, it is not possible to make the Fe (%) the same.
以上により、従来法では塗装性の点から表面、裏面のＦ
ｅ濃度を変えたい場合（ケース２）、あるいは耐蝕性の
点から付着量を１＝２として同−ＦｅＷ度にしたい場合
は、めっき層中のｐ ｅ ４度を同一にすることはでき
ないが、本発明によれば亜鉛浴中のＡ１濃度を表面、裏
面各独立で調節できるために、Ｆｅｆｉ度を変えたい場
合、あるいは付着量が異なっている場合でも槽別に浴中
Ａ１濃度を変えて通板することによりＦｅ濃度を同一に
することができた。As a result of the above, in the conventional method, from the viewpoint of paintability, F-
If you want to change the e concentration (Case 2), or if you want to make the same −FeW degree by setting the adhesion amount to 1=2 from the viewpoint of corrosion resistance, it is not possible to make the p e 4 degree in the plating layer the same. According to the present invention, the A1 concentration in the zinc bath can be adjusted independently for the front and back surfaces, so even when it is desired to change the Fefi degree or the amount of adhesion is different, the A1 concentration in the bath can be changed for each bath and the plate can be threaded. By doing so, it was possible to make the Fe concentration the same.
なお、第１表中、（）内、Ａ槽、Ｂ槽は槽毎にＡ＃ＰＬ
度を変えてＡ槽→Ｂ槽を通板する意味である。In addition, in Table 1, the A#PL for each tank is in parentheses, A tank, and B tank.
This means passing the plate from tank A to tank B by changing the degree.
第１表において付着量（目標値、実績値）・・・・・・
ｇ／ 、、７．浴中Ａ ｅ 濃度（Ａ槽、Ｂ槽） −−
−−−−ｗ ｔ％。In Table 1, adhesion amount (target value, actual value)...
g/,,7. A e concentration in bath (tank A, tank B) --
---wt%.
コイルサイズ（板厚×幅）・・・・・・０．８ ｔ ｘ
１２００−虐２ ラインスピード・・・・・・６０
ｍ／ｍ ｉ ｎとする。Coil size (thickness x width)...0.8 t x
1200-Bruce 2 Line speed...60
Let m/min.
［発明の効果］
以上説明したように本発明によれば、溶融亜鉛めっき鋼
板において、亜鉛付着量とめっき槽Ｆｅ濃度を表、裏各
独立に調節することが可能となり、めっき鋼板の耐蝕性
はもちろん、塗装性も飛躍的に向上させることが可能と
なった。[Effects of the Invention] As explained above, according to the present invention, it is possible to independently adjust the amount of zinc coating and the Fe concentration in the plating bath on the front and back sides of a hot-dip galvanized steel sheet, and the corrosion resistance of the galvanized steel sheet can be improved. Of course, it has also become possible to dramatically improve paintability.
第１図は本発明に使用する亜鉛めっき装置の概略図、第
２図は浴中Ａ７！濃度とめっき層中Ｆｅ濃度との関係を
示すグラフ、第３図は本発明による溶融亜鉛めっき鋼板
製造ラインの概念図、第４図は従来例による亜鉛めっき
のための装置の概略図である。
１・・・・・・鋼板、１７・・・・・・鋼板の表面用亜
鉛浴、１８・・・・・・鋼板の裏面用亜鉛浴。Figure 1 is a schematic diagram of the galvanizing equipment used in the present invention, and Figure 2 is an A7 in the bath! FIG. 3 is a conceptual diagram of a production line for hot-dip galvanized steel sheets according to the present invention, and FIG. 4 is a schematic diagram of a conventional galvanizing apparatus. 1... Steel plate, 17... Zinc bath for the surface of the steel plate, 18... Zinc bath for the back side of the steel plate.
Claims (1)
鉛浴と裏面用亜鉛浴とを一ラインにおいて併設し、鋼板
の表面と裏面のそれぞれに対し製品に要求される合金化
度に応じて前記各亜鉛浴中のＡｌ濃度を調整することに
より、鋼板の表面、裏面それぞれ独立に亜鉛付着量、め
っき層合金化度を調節することを特徴とする溶融亜鉛め
っき鋼板の製造方法。(1) When hot-dip galvanizing a steel plate, a zinc bath for the front side of the steel plate and a zinc bath for the back side of the steel plate are installed together in one line, and the A method for manufacturing a hot-dip galvanized steel sheet, characterized in that the amount of zinc deposited and the degree of alloying of the plating layer are independently adjusted on the front and back surfaces of the steel sheet by adjusting the Al concentration in each zinc bath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24559088A JPH0293054A (en) | 1988-09-29 | 1988-09-29 | Production of hot dip galvanized steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24559088A JPH0293054A (en) | 1988-09-29 | 1988-09-29 | Production of hot dip galvanized steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0293054A true JPH0293054A (en) | 1990-04-03 |
Family
ID=17135992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24559088A Pending JPH0293054A (en) | 1988-09-29 | 1988-09-29 | Production of hot dip galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0293054A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04272163A (en) * | 1991-02-27 | 1992-09-28 | Nippon Steel Corp | Method for controlling alloying of hot dip galvanized steel sheet |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62196363A (en) * | 1986-02-21 | 1987-08-29 | Sumitomo Metal Ind Ltd | Manufacture of one-side alloyed hot dip galvanized steel sheet |
-
1988
- 1988-09-29 JP JP24559088A patent/JPH0293054A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62196363A (en) * | 1986-02-21 | 1987-08-29 | Sumitomo Metal Ind Ltd | Manufacture of one-side alloyed hot dip galvanized steel sheet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04272163A (en) * | 1991-02-27 | 1992-09-28 | Nippon Steel Corp | Method for controlling alloying of hot dip galvanized steel sheet |
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