JP2769350B2 - Manufacturing method of hot-dip coated steel sheet - Google Patents
Manufacturing method of hot-dip coated steel sheetInfo
- Publication number
- JP2769350B2 JP2769350B2 JP7406689A JP7406689A JP2769350B2 JP 2769350 B2 JP2769350 B2 JP 2769350B2 JP 7406689 A JP7406689 A JP 7406689A JP 7406689 A JP7406689 A JP 7406689A JP 2769350 B2 JP2769350 B2 JP 2769350B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- plating
- hot
- steel sheet
- dip
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、耐食性、耐高温酸化性、めっき密着性に優
れた溶融めっきステンレス鋼板の製造方法に関するもの
である。Description: TECHNICAL FIELD The present invention relates to a method for producing a hot-dip coated stainless steel sheet having excellent corrosion resistance, high-temperature oxidation resistance, and plating adhesion.
［従来の技術］ ステンレス鋼板に溶融金属めっきするに際し、溶融金
属めっきに先立ってNi,Co,Mo等を電気めっきした後、イ
ンライン焼鈍方式たとえばゼンジマー方式或はフラック
ス方式といった連続めっきラインによって溶融金属めっ
きする方法が、たとえば特開昭61-147865号公報或は特
開昭63-47356号公報に開示されている。しかしながら、
これら先行技術によるときは、耐高温酸化性、めっき密
着性の点で必ずしも満足すべき製品を得ることができな
かった。[Prior art] In hot-dip metal plating on a stainless steel plate, after electroplating Ni, Co, Mo, etc. prior to hot-dip metal plating, hot-dip metal plating is performed by a continuous plating line such as an in-line annealing method such as a Zenzimer method or a flux method. A method for performing this is disclosed in, for example, JP-A-61-147865 or JP-A-63-47356. However,
According to these prior arts, it was not always possible to obtain a product that was satisfactory in terms of high-temperature oxidation resistance and plating adhesion.
［発明が解決しようとする課題］ 本発明は、簡潔なプロセスで低コスト下に耐食性、耐
高温酸化性、めっき密着性に優れた溶融めっきステンレ
ス鋼板の製造方法を提供することを目的としてなされ
た。[Problems to be Solved by the Invention] An object of the present invention is to provide a method for producing a hot-dip coated stainless steel sheet excellent in corrosion resistance, high-temperature oxidation resistance, and plating adhesion at a low cost with a simple process. .
［課題を解決するための手段］ 本発明の特徴とする処は、特許請求の範囲の記載の通
りである。以下に、本発明を詳細に説明する。[Means for Solving the Problems] The features of the present invention are as described in the claims. Hereinafter, the present invention will be described in detail.
ステンレス鋼板の特性たとえば耐食性、耐高温酸化性
を改善するためにステンレス鋼板に溶融金属めっきする
ことが知られている。しかしながら、ステンレス鋼板の
表面には不働態皮膜と呼ばれる安定な酸化皮膜が存在し
ているため、通常の軟鋼を対象とするのと同じ方法で
は、良好なめっき皮膜を得ることは困難である。そこ
で、上述のように、溶融金属めっきに先立ってNi,Co,Mo
等を電気めっきした後、インライン焼鈍方式たとえばゼ
ンジマー方式或はフラックス方式といった連続めっきラ
インによって溶融金属めっきする方法が採られてきた。
しかしながら、現実にはこのような方法で溶融金属めっ
きを行うに際しては、最適めっき条件の設定が困難であ
り、歩留り等の点で問題があった。It is known that stainless steel sheets are hot-dip plated to improve the properties of the stainless steel sheets, for example, corrosion resistance and high-temperature oxidation resistance. However, since a stable oxide film called a passivation film exists on the surface of the stainless steel sheet, it is difficult to obtain a good plating film by the same method as that for ordinary mild steel. Therefore, as described above, prior to hot-dip metal plating, Ni, Co, Mo
After electroplating, the method of hot-dip metal plating by a continuous plating line such as an in-line annealing system such as a Zenzimer system or a flux system has been adopted.
However, in practice, when performing hot-dip metal plating by such a method, it is difficult to set optimum plating conditions, and there is a problem in terms of yield and the like.
本発明者等は、表面酸化−還元−溶融金属浴への浸漬
というプロセスで溶融めっきされるステンレス鋼板表面
の状態を研究した結果、本発明を完成させたものであ
る。The present inventors have completed the present invention as a result of studying the state of the surface of a stainless steel sheet that is hot-dip coated by a process of surface oxidation, reduction, and immersion in a molten metal bath.
本発明者等の研究によれば、ステレス鋼板への溶融金
属めっきが困難な理由は、以下の通りである。According to the study of the present inventors, the reason why the hot-dip metal plating on the stainless steel plate is difficult is as follows.
ステンレス鋼板に溶融金属めっきする場合、めっき金
属浴へ浸漬する直前のステンレス鋼板の表面状態は、最
初の過程である酸化過程での表面酸化の程度によって決
る。When a stainless steel plate is subjected to hot-dip metal plating, the surface state of the stainless steel plate immediately before immersion in the plating metal bath is determined by the degree of surface oxidation in the oxidation process, which is the first step.
この表面酸化の程度が小さ過ぎる場合は、酸化過程に
続く還元過程で、予めめっきされたNi等の活性金属はス
テンレス鋼板内部に拡散し、またCr,Al,Mn等の易酸化性
元素の酸化物が鋼板表面に濃化し、ステンレス鋼板とめ
っき金属の「濡れ」を悪くする。一方、表面酸化の程度
が大き過ぎる場合は、Cr,Al,Mn等の易酸化性元素がNiめ
っき層直下に酸化物層を形成するため、酸化過程に続く
還元過程でもNiのステンレス鋼板内部への拡散は抑制さ
れ、ステンレス鋼板とめっき金属の「濡れ」は良好とな
るけれども、その後の合板化反応が進行しないから密着
性不良となる。また、Crを多量に含有するステンレス鋼
板にあっては、易酸化性元素の酸化物が鋼板表面に濃化
し、ステンレス鋼板とめっき金属の「濡れ」を悪くする
程度が著しい。さらに、一旦ステンレス鋼板中に取り込
まれた酸素の量は、還元過程を経た後も殆ど減少しな
い。即ち、ステンレス鋼板への溶融めっきにおいては、
還元処理によっても普通のようには表面が活性化されな
い。If the degree of this surface oxidation is too small, in the reduction process following the oxidation process, the active metal such as pre-plated Ni diffuses into the stainless steel plate and oxidizes easily oxidizable elements such as Cr, Al, and Mn. The material concentrates on the surface of the steel sheet, making the "wetting" of the stainless steel sheet and the plated metal worse. On the other hand, if the degree of surface oxidation is too large, easily oxidizable elements such as Cr, Al, and Mn form an oxide layer immediately below the Ni plating layer. Is suppressed, and the "wetting" between the stainless steel plate and the plated metal becomes good, but the adhesion becomes poor since the subsequent plywood reaction does not proceed. Further, in a stainless steel sheet containing a large amount of Cr, the oxide of the easily oxidizable element is concentrated on the steel sheet surface, and the degree of deterioration of “wetting” between the stainless steel sheet and the plated metal is remarkable. Further, the amount of oxygen once taken into the stainless steel plate hardly decreases even after the reduction process. That is, in hot-dip plating on stainless steel sheet,
The reduction treatment does not activate the surface as usual.
本発明者等は、ステンレス鋼板への溶融めっきが困難
である理由が、種々の元素の拡散に起因していること、
また還元過程がめっきに対してあまり寄与していないこ
とを解明し、ステンレス鋼板を高温に保つ時間を可及的
に短くして元素の拡散を防止することによって、容易に
ステンレス鋼板への溶融めっきを行うことができると考
え、研究を進めた結果、本発明を完成した。The present inventors have found that the reason why hot-dip coating on a stainless steel sheet is difficult is due to the diffusion of various elements,
In addition, it was found that the reduction process did not contribute much to the plating, and the time for keeping the stainless steel plate at a high temperature was shortened as much as possible to prevent the diffusion of elements. The present invention was completed as a result of considering that it was possible to carry out the research.
本発明においては、ステンレス鋼板は次のようにして
溶融めっきされる。In the present invention, the stainless steel plate is hot-dip plated as follows.
ステンレス鋼板としては、成分、材質等特別の制限は
ないけれども、焼鈍済のものを用いることが望ましい。
本発明によるめっきは、インライン焼鈍方式ではないか
ら、たとえステンレス鋼板をその再結晶温度まで昇温さ
せたとしても、結晶粒を成長させることはできず、製品
の加工性が不十分となるからである。As the stainless steel sheet, although there is no particular limitation on the components and materials, it is preferable to use an annealed stainless steel sheet.
Since the plating according to the present invention is not an in-line annealing method, even if the stainless steel sheet is heated to its recrystallization temperature, the crystal grains cannot grow and the workability of the product becomes insufficient. is there.
本発明においては、後述するように、ステンレス鋼板
の加熱時間を極力短かくすることが重要であり、最高加
熱温度は溶融金属（めっき金属）浴温度までとすること
が望ましい。溶融めっきの前処理として、Ni,Feを単独
で或はこれらの金属を含む合金をめっきする。このめっ
きの方法は特に限定しないが、めっきの密着性、均一
性、コスト等の点から電気めっきが好ましく、さらに
は、ストライクめっき処理を行った後、電気めっきする
のが望ましい。めっき付着量は、ステンレス鋼板の加熱
時間が長いほど良好な溶融めっき性を得るための最低所
要付着量が大きくなるが、コストとの兼ねあいから最適
付着量が決定される。In the present invention, as described later, it is important to shorten the heating time of the stainless steel sheet as much as possible, and it is desirable that the maximum heating temperature be up to the molten metal (plating metal) bath temperature. As a pretreatment for hot-dip plating, Ni or Fe alone or an alloy containing these metals is plated. Although the plating method is not particularly limited, electroplating is preferable in terms of adhesion, uniformity, cost, and the like of the plating. Further, it is preferable to perform electroplating after performing strike plating. Regarding the coating weight, the longer the heating time of the stainless steel plate is, the larger the minimum coating weight required to obtain good hot-dipability is, but the optimum coating weight is determined in view of the cost.
本発明者等の研究によれば、ステンレス鋼板を600℃
以上の高温に加熱する必要がある溶融Alめっきの場合に
おいて、ステンレス鋼板の昇温時間を10秒間としたとき
に最高5g/m2のNiめっき付着量が必要であり、めっきの
均一性の点等を考慮して、最低0.5g/m2の付着量が必要
である。最適付着量は、ステンレス鋼板の加熱時間、加
熱温度等の条件によって決定されねばならない。According to the study of the present inventors, the stainless steel plate
In the case of the molten Al plating it is necessary to heat to temperatures higher than, requires Ni coating weight of up to 5 g / m 2 the heating time when the 10 seconds of stainless steel, in terms of the uniformity of the plating In consideration of the above, an adhesion amount of at least 0.5 g / m 2 is required. The optimum amount of adhesion must be determined by conditions such as the heating time and the heating temperature of the stainless steel sheet.
前処理としてのめっきを施されたステンレス鋼板は、
引き続き、N2、Ar等の非酸化性雰囲気或はN2＋H2等の還
元性雰囲気下で通電加熱或は誘導加熱等の手段によっ
て、100℃/s以上の加熱速度で必要温度、一般にはめっ
き金属浴温度、場合によってはステンレス鋼板の再結晶
温度まで加熱される。必要温度まで加熱されたステンレ
ス鋼板は、この温度に保定されることなくかつ、大気に
接触せしめられることなく、加熱開始時点から10秒間以
内に溶融金属（めっき金属）浴中に浸漬される。前記ス
テンレス鋼板の加熱時間は、短いほど良い。加熱時間を
短くすることによって、Ni等の活性金属のステンレス鋼
板内部への拡散およびCr,Al,Mn等の易酸化性元素の酸化
物の鋼板表面における濃化の防止を可能にする。同じ理
由によって、ステンレス鋼板の加熱到達温度も可及的に
低い方が良い。加熱到達温度が高いほどまた、加熱時間
が長いほど前処理としてのめっき所要付着量たとえばNi
めっき所要付着量が増大し、コストの上昇、前処理とし
てめっきされた金属の溶出による溶融めっき金属浴の汚
染等の問題を惹起する。しかしながら、ステンレス鋼板
の昇温速度を過度に高くすると、めっき金属浴へのステ
ンレス鋼板の浸漬温度の制御が困難となり、ステンレス
鋼板と溶融金属（めっき金属）の反応が不均一となる。
また、溶融金属（めっき金属）浴の温度制御が困難とな
り、さらに設備コストが高くなる等の問題を惹起する。Plated stainless steel plate as pre-treatment,
Subsequently, in a non-oxidizing atmosphere such as N 2 or Ar or a reducing atmosphere such as N 2 + H 2 , by heating or induction heating at a heating rate of 100 ° C./s or more, the required temperature, generally It is heated to the plating metal bath temperature, and in some cases, to the recrystallization temperature of the stainless steel sheet. The stainless steel sheet heated to the required temperature is immersed in a molten metal (plating metal) bath within 10 seconds from the start of heating without being kept at this temperature and without being brought into contact with the atmosphere. The shorter the heating time of the stainless steel plate, the better. By shortening the heating time, it becomes possible to prevent the active metal such as Ni from diffusing into the stainless steel sheet and to prevent the oxide of the easily oxidizable element such as Cr, Al and Mn from being concentrated on the steel sheet surface. For the same reason, it is better that the temperature at which the stainless steel plate reaches the lowest possible temperature. The higher the temperature attained by heating and the longer the heating time, the more the required amount of plating as a pretreatment, such as Ni
The required amount of plating increases, raising the cost and causing problems such as contamination of the hot-dip metal bath due to elution of the plated metal as a pretreatment. However, if the temperature rise rate of the stainless steel sheet is excessively high, it is difficult to control the immersion temperature of the stainless steel sheet in the plating metal bath, and the reaction between the stainless steel sheet and the molten metal (plating metal) becomes uneven.
In addition, it becomes difficult to control the temperature of the molten metal (plating metal) bath, which causes problems such as an increase in equipment cost.
本発明者等の知見によれば、例えば150℃/sの昇温速
度であれば、数mm厚さのステンレス鋼板の場合でも容易
に高精度下に加熱することができる。一方、ステンレス
鋼板の加熱時間は、ステンレス鋼板を再結晶温度まで加
熱した後溶融金属（めっき金属）浴温度まで降下せしめ
る場合も考慮して、加熱開始から溶融金属（めっき金
属）浴浸漬までの時間を10秒間以内とした。According to the findings of the present inventors, for example, a stainless steel plate having a thickness of several mm can be easily heated with high accuracy at a heating rate of 150 ° C./s. On the other hand, the heating time of the stainless steel sheet is determined as the time from the start of heating to the immersion of the molten metal (plating metal) bath, considering the case where the stainless steel sheet is heated to the recrystallization temperature and then lowered to the molten metal (plating metal) bath temperature. For less than 10 seconds.
ステンレス鋼板の溶融金属（めっき金属）浴への浸漬
後の処理たとえば付着量の制御、化成処理等は、通常の
溶融めっきの場合と同様になされる。The treatment after immersing the stainless steel sheet in the molten metal (plating metal) bath, for example, the control of the amount of adhesion, the chemical conversion treatment, and the like are performed in the same manner as in the case of ordinary hot-dip plating.
［実施例１］ 焼鈍、酸洗済の0.5mm厚さの15％ Cr-4.5％ Alステン
レス鋼板（ストリップ）に、Niストライクめっきを施し
た後、2g/m2のNiめっき（電気めっき）を行い、しかる
後表１に示す条件で溶融Alめっき（10％ Si-Al,浴温:65
0℃）を行った。ステンレス鋼板の加熱雰囲気は、本発
明方法ではN2、ゼンジマー方式では30％ H2＋70％ N2
とした。結果を、表１に示す。Example 1 After annealing and pickling, a 0.5% thick 15% Cr-4.5% Al stainless steel sheet (strip) was subjected to Ni strike plating, and then 2g / m 2 Ni plating (electroplating). And then hot-dip Al plating (10% Si-Al, bath temperature: 65) under the conditions shown in Table 1.
0 ° C.). The heating atmosphere of the stainless steel sheet is N 2 in the method of the present invention, and 30% H 2 + 70% N 2 in the Sendzimer method.
And Table 1 shows the results.
表１から明らかな如く、本発明によるときは、良好な
溶融めっきステンレス鋼板が得られる。 As is clear from Table 1, according to the present invention, a good hot-dip coated stainless steel sheet can be obtained.
［実施例２］ 焼鈍、酸洗済の0.8mm厚さの18％ Cr-8％ Niステンレ
ス鋼板（ストリップ）に、Niストライクめっきを施した
後、2g/m2のFe-Ni合金をめっき（電きめっき）し、しか
る後表２に示す条件で溶融Alめっき（100％ Al、浴温:6
80℃）を行った。ステンレス鋼板の加熱時間は、本発明
方法では８秒間、ゼンジマー方式では65秒間であった。
加熱雰囲気は、本発明方法、ゼンジマー方式何れの場合
も30％ H2＋70％N2とした。結果を、表２に示す。[Example 2] Annealed and pickled, an 18% Cr-8% Ni stainless steel sheet (strip) having a thickness of 0.8 mm was subjected to Ni strike plating, and then plated with a 2 g / m 2 Fe-Ni alloy ( Electroplating, and then hot-dip Al plating (100% Al, bath temperature: 6) under the conditions shown in Table 2.
80 ° C). The heating time of the stainless steel sheet was 8 seconds in the method of the present invention and 65 seconds in the Sendzimer method.
The heating atmosphere was 30% H 2 + 70% N 2 in both the method of the present invention and the Sendzimer method. Table 2 shows the results.
表２から明らかな如く、本発明によるときは、良好な
溶融Alめっきステンレス鋼板が得られる。As is clear from Table 2, according to the present invention, a good hot-dip Al-plated stainless steel sheet can be obtained.
［発明の効果］ 本発明によるときは、簡潔なプロセスでかつ低コスト
でステンレス鋼板を母材とする溶融金属或は合金めっき
鋼板を製造することができる。 [Effect of the Invention] According to the present invention, a molten metal or alloy-plated steel sheet using a stainless steel sheet as a base material can be manufactured in a simple process and at low cost.
フロントページの続き (56)参考文献 特開 昭64−28351（ＪＰ，Ａ) 特開 昭64−28349（ＪＰ，Ａ) 特開 昭63−235485（ＪＰ，Ａ) 特開 昭63−230898（ＪＰ，Ａ) 特開 昭60−262950（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C23C 2/00 - 2/40Continuation of the front page (56) References JP-A-64-28351 (JP, A) JP-A-64-28349 (JP, A) JP-A-63-235485 (JP, A) JP-A-63-230898 (JP, A) , A) JP-A-60-262950 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C23C 2/00-2/40
Claims (1)
において、溶融金属めっきに先立ってステンレス鋼板に
Ni,Feを単独に或はこれらを含む合金を0.5〜5g/m2めっ
きした後、非酸化性或は還元性雰囲気下に溶融金属浴温
度若しくはその近傍或はステンレス鋼板の再結晶温度以
上の温度まで100℃/s以上の加熱速度で加熱し、前記到
達温度に保定することなくかつ大気に接触させることな
く、加熱開始時点から10秒間以内に溶融金属或は溶融合
金をめっきするようにしたことを特徴とする溶融めっき
鋼板の製造方法1. A method for hot-dip metal plating on a stainless steel plate, wherein the hot-dip coating is performed on the stainless steel plate prior to hot-dip metal plating.
Ni, after 0.5 to 5 g / m 2 plating alloy containing alone or these to Fe, nonoxidizing or molten metal bath temperature or in the vicinity or stainless steel that the reducing atmosphere recrystallization temperature or more Heated to a temperature at a heating rate of 100 ° C./s or more, without keeping the temperature reached and without contacting with the atmosphere, plating the molten metal or molten alloy within 10 seconds from the start of heating. Method for producing hot-dip coated steel sheet characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7406689A JP2769350B2 (en) | 1989-03-28 | 1989-03-28 | Manufacturing method of hot-dip coated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7406689A JP2769350B2 (en) | 1989-03-28 | 1989-03-28 | Manufacturing method of hot-dip coated steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02254145A JPH02254145A (en) | 1990-10-12 |
| JP2769350B2 true JP2769350B2 (en) | 1998-06-25 |
Family
ID=13536444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7406689A Expired - Lifetime JP2769350B2 (en) | 1989-03-28 | 1989-03-28 | Manufacturing method of hot-dip coated steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2769350B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11001918B2 (en) | 2011-12-28 | 2021-05-11 | Posco | High-strength hot-dip galvanized steel sheet having excellent plating surface quality and adhesion, and method of manufacturing the same |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6087019A (en) * | 1996-05-31 | 2000-07-11 | Kawasaki Steel Corporation | Plated steel sheet |
| FR2756846B1 (en) * | 1996-12-11 | 1999-01-08 | Lorraine Laminage | PROCESS FOR THE TEMPER COATING OF A STEEL SHEET |
| KR100376522B1 (en) * | 1996-12-24 | 2003-06-09 | 주식회사 포스코 | Manufacturing method of molten aluminum coated stainless steel sheet having superior coating adhesion and corrosion resistance |
| KR100558059B1 (en) * | 2001-10-17 | 2006-03-07 | 주식회사 포스코 | method of manufacturing a hot dip aluminized stainless steel |
-
1989
- 1989-03-28 JP JP7406689A patent/JP2769350B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11001918B2 (en) | 2011-12-28 | 2021-05-11 | Posco | High-strength hot-dip galvanized steel sheet having excellent plating surface quality and adhesion, and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02254145A (en) | 1990-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0149655B1 (en) | Diffusion treated hot-dip aluminum coated steel and method or treating | |
| EP0246418B1 (en) | Hot dip aluminium coated chromium alloy steel | |
| JP2526320B2 (en) | Method for producing high-strength galvannealed steel sheet | |
| JP2707928B2 (en) | Hot-dip galvanizing method for silicon-containing steel sheet | |
| JP4510697B2 (en) | P-added steel sheet galvannealed alloying method | |
| JP2769350B2 (en) | Manufacturing method of hot-dip coated steel sheet | |
| JP2587725B2 (en) | Method for producing P-containing high tensile alloyed hot-dip galvanized steel sheet | |
| JP2005272967A (en) | METHOD FOR MANUFACTURING HOT DIP Al TYPE COATED STEEL SHEET HAVING DECREASED PLATING DEFECTS | |
| JPH04147955A (en) | Production of hot-dip zn-mg-al coated steel sheet | |
| JPS61270363A (en) | Diffused alloy steel foil | |
| JPS60262950A (en) | Manufacture of aluminized steel sheet having superior heat and corrosion resistance | |
| JPH06212383A (en) | Hot dip galvanizing method for silicon-containing steel sheet | |
| JP2001279409A (en) | Galvannealed high tension steel sheet excellent in workability and its production method | |
| JP2525165B2 (en) | Method for manufacturing high strength galvanized steel sheet | |
| JPH0797670A (en) | Galvanizing method for silicon-containing steel sheet | |
| JPH0551714A (en) | Hot-dip galvanizing method for si-containing steel sheet | |
| JPH10158784A (en) | High strength hot rolled steel sheet | |
| JP3078456B2 (en) | Manufacturing method of high-strength hot-dip galvanized steel sheet | |
| JPH05106001A (en) | Hot-dip galvanizing method for silicon-containing steel sheet | |
| JP2674429B2 (en) | Hot-dip galvanizing method for silicon-containing steel sheet | |
| US4666794A (en) | Diffusion treated hot-dip aluminum coated steel | |
| JP2783457B2 (en) | Manufacturing method of hot-dip Zn-Al plated steel sheet | |
| JP3383125B2 (en) | Hot-dip aluminized steel sheet with excellent corrosion resistance and heat resistance, and its manufacturing method | |
| JP2000119832A (en) | Hot dip galvanized steel sheet excellent in plating adhesion | |
| JPH0635648B2 (en) | Hot-dip, low-reduction type hot dip galvanizing method for zinc or zinc alloys |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 11 Free format text: PAYMENT UNTIL: 20090410 |
|
| EXPY | Cancellation because of completion of term |