JP2624272B2 - Surface treated steel sheet with excellent press formability - Google Patents
Surface treated steel sheet with excellent press formabilityInfo
- Publication number
- JP2624272B2 JP2624272B2 JP62297984A JP29798487A JP2624272B2 JP 2624272 B2 JP2624272 B2 JP 2624272B2 JP 62297984 A JP62297984 A JP 62297984A JP 29798487 A JP29798487 A JP 29798487A JP 2624272 B2 JP2624272 B2 JP 2624272B2
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- Prior art keywords
- steel sheet
- plating
- corrosion resistance
- alloy
- plating layer
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Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、例えば自動車、家電製品、建材等の様にプ
レス成形して使用される表面処理鋼板に関し、特にプレ
ス成形性の向上従ってプレス成形後に耐食性劣化防止を
図った表面処理鋼板に関するものである。Description: FIELD OF THE INVENTION The present invention relates to a surface-treated steel sheet used by press forming, for example, for automobiles, home electric appliances, building materials, etc., and more particularly to an improvement in press formability and therefore press forming. The present invention relates to a surface-treated steel sheet whose corrosion resistance has been prevented from being deteriorated later.
［従来の技術］ 鋼板を防食加工する手段としては従来からZnめっきが
汎用されている。しかし鋼板の耐食性向上に対する要請
は更に高まる傾向にあり、従来のZnめっき鋼板では需要
者の要求を十分に満たすことができなくなってきた。こ
の様な背景のもとで、これまでのZnめっきの他に種々の
Zn合金めっきが検討され、一部実用化されている。例え
ば自動車用や家電用の鋼板における防食加工では、Znめ
っきよりも数段優れた耐食性を示すZn−Ni合金めっきや
Zn−Fe合金めっきが電気めっき法によって実用化されて
おり、耐食性の面では効果が十分発揮されている。[Prior Art] Zn plating has been widely used as a means for preventing corrosion of a steel sheet. However, the demand for improved corrosion resistance of steel sheets has tended to increase further, and conventional Zn-plated steel sheets have become unable to sufficiently satisfy the demands of consumers. Against this background, in addition to conventional Zn plating, various
Zn alloy plating has been studied and some have been put to practical use. For example, in anti-corrosion processing of steel sheets for automobiles and home appliances, Zn-Ni alloy plating, which shows corrosion resistance several times better than Zn plating,
Zn-Fe alloy plating has been put to practical use by an electroplating method, and the effect is sufficiently exhibited in terms of corrosion resistance.
［発明が解決しようとする問題点］ 一方上述した用途においては、プレス成形等の加工が
加えられて製品化されるのが殆どであり、従ってめっき
鋼板にはめっき層自体の耐食性が要求されるばかりでな
くプレス成形性や加工後の耐食性等も同時に満足する必
要がある。この様な観点から従来のZnめっき鋼板やZn合
金めっき鋼板を考察した場合、いずれもその要求を満足
しているとは言い難い面ある。即ちZnめっき鋼板におい
ては、めっき層が柔か過ぎるのでプレス成形時にめっき
層が金型に付着し、次に来るワークのプレスに際して押
し疵の原因となるばかりか耐食性自体も劣化する。又Zn
−NiやZn−Fe等の合金めっき鋼板においては、耐食性の
良好な組成範囲は硬い金属間化合物が存在する組成範囲
と一致するので、プレス成形時にめっき層が素地鋼板か
ら剥離する所謂パウダリングやフレーキング等の現象が
発生し、この為加工後の耐食性が加工前に比べて著しく
悪化する。[Problems to be Solved by the Invention] On the other hand, in the above-mentioned applications, most of the products are processed by press forming or the like, and therefore, the plated steel plate is required to have the corrosion resistance of the plated layer itself. In addition, it is necessary to satisfy not only press formability and corrosion resistance after working at the same time. From such a viewpoint, when considering conventional Zn-plated steel sheets and Zn alloy-plated steel sheets, none of them can be said to satisfy the requirements. That is, in the case of a Zn-plated steel sheet, the plating layer is too soft, so that the plating layer adheres to the metal mold during press forming, and not only causes a pressing flaw when the next work is pressed, but also deteriorates the corrosion resistance itself. Also Zn
-In alloy-plated steel sheets such as -Ni and Zn-Fe, the composition range with good corrosion resistance matches the composition range in which hard intermetallic compounds are present, and so-called powdering in which the plating layer peels from the base steel sheet during press forming. Phenomena such as flaking occur, and therefore, the corrosion resistance after processing is significantly deteriorated as compared with that before processing.
本発明はこうした現状のもとでなされたものであっ
て、その目的とするところは、プレス成形性の優れた、
特に成形後の耐食性劣化防止を図った表面処理鋼板を提
供する点にある。The present invention has been made under such circumstances, and the purpose thereof is to provide excellent press formability,
In particular, it is an object of the present invention to provide a surface-treated steel sheet that prevents corrosion resistance deterioration after forming.
［問題点を解決する為の手段］ 上記目的を達成することのできた本発明の表面処理鋼
板とは、素地鋼板上にZn−Mg合金の真空蒸着めっき層が
形成されると共に、前記めっき層は主としてMg2Zn11，M
gZn2,MgZnよりなる群から選択される金属間化合物の１
種又は２種以上から構成され、且つMg単独相を含んでい
ないものである点に要旨を有するものである。[Means for Solving the Problems] The surface-treated steel sheet of the present invention, which has achieved the above object, includes a Zn—Mg alloy vacuum-deposited plating layer formed on a base steel sheet, and the plating layer Mainly Mg 2 Zn 11 , M
One of the intermetallic compounds selected from the group consisting of gZn 2 and MgZn
It has a gist in that it is composed of one or more species and does not contain a single phase of Mg.
［作用］ 本発明者らはZn系めっき鋼板に見られる前述の様な問
題点を解決すべく、様々のZn系合金やめっき手段等につ
いて研究を行なった結果、蒸着法によって形成されるZn
−Mg合金めっき鋼板はプレス成形性において非常に優れ
たものであることを知った。即ち第１図は本発明に係る
蒸着Zn−Mg合金めっき鋼板におけるMg含有量と、ドロー
ビート試験によるめっき剥離量との関係を示すグラフで
あるが、この結果から明らかな様に３〜30％程度のMgを
含有させることによって極めて優れた加工性を示すこと
が判明した。[Actions] The present inventors have conducted research on various Zn-based alloys and plating means in order to solve the above-mentioned problems observed in Zn-based plated steel sheets, and have found that Zn formed by a vapor deposition method.
-We found that the Mg alloy plated steel sheet was very excellent in press formability. That is, FIG. 1 is a graph showing the relationship between the Mg content in the vapor-deposited Zn-Mg alloy plated steel sheet according to the present invention and the amount of plating peeling by a draw beat test. It has been found that the addition of a certain amount of Mg shows extremely excellent workability.
尚Zn系めっき鋼板においては、めっき層自体の耐食性
が良好であることも当然必要であり、本発明者らはその
点をも検討したところ、耐食性においても優れた効果を
発揮し得ることが判明したので別途出願した（特願昭62
−175395号）。それによるとZn−Mg合金蒸着めっき鋼板
は、Mg含有量が0.5〜40重量％の範囲で優れた耐食性向
上効果を示した。この様にZn−Mg合金蒸着めっき鋼板が
優れた耐食性を示すのは、本発明者らのその後の研究に
よって次の様なことが判明した。即ちZn−Mg合金蒸着め
っき鋼板を塩素イオンが混在する様な腐食性雰囲気を形
成した環境に置くと、めっき層中のMgが塩素イオンと反
応して一定限定まで溶出し、めっき層表面にMgと塩基性
塩化亜鉛からなり、且つ塩基性塩化亜鉛の六方晶結晶体
がめっき厚さ方法に配列した特殊な層が形成され、その
ことによって優れた耐食性を発揮する。又一般的な腐食
環境下においてはめっき層中のMgがZn−ZnO進行を抑制
し、このことがZn−Mg合金蒸着めっき鋼板の耐食性を向
上させる。Incidentally, in the Zn-based plated steel sheet, it is naturally necessary that the corrosion resistance of the plating layer itself is good, and the present inventors also examined that point, and found that excellent effects can also be exhibited in the corrosion resistance. Was filed separately (Japanese Patent Application No. Sho 62
No. 175395). According to the results, the Zn—Mg alloy vapor-deposited steel sheet exhibited an excellent corrosion resistance improving effect when the Mg content was in the range of 0.5 to 40% by weight. The following research by the present inventors has revealed that the Zn—Mg alloy vapor-deposited steel sheet exhibits excellent corrosion resistance as described below. That is, when the Zn-Mg alloy vapor-deposited plated steel sheet is placed in an environment in which a corrosive atmosphere such as a mixture of chlorine ions is formed, Mg in the plating layer reacts with chlorine ions and elutes to a certain extent, and Mg on the plating layer surface. And a basic layer formed of basic zinc chloride and hexagonal crystals of basic zinc chloride arranged in a plating thickness method, thereby exhibiting excellent corrosion resistance. In a general corrosive environment, Mg in the plating layer suppresses the progress of Zn—ZnO, which improves the corrosion resistance of the Zn—Mg alloy vapor-deposited plated steel sheet.
本発明者らはZn−Mg合金蒸着めっき鋼板が優れた加工
性を示す理由について詳細に検討したところ、加工性の
良否はめっき層の相構造に大きく影響されるという知見
が得られた。即ちZn−Mg合金蒸着めっき鋼板の相構造を
Ｘ線回折によって調査したところ、加工性の優れたZn−
Mgめっき層においてはZnとMgの金属間化合物であるMg2Z
n11，MgZn2,MgZnよりなる群から選択される１種又は２
種以上を主体として構成され、或はこれらに少量のZn
（η相）を含む構造であることが明らかとなった。これ
に対し加工性が劣化する範囲では、Zn（η相）が主体と
なる構成、或はMg単独相又は上記以外の他の金属間化合
物（Mg7Zn3）が出現していた。The present inventors have examined in detail the reason why the Zn—Mg alloy vapor-deposited plated steel sheet exhibits excellent workability, and found that the workability is greatly affected by the phase structure of the plated layer. That is, when the phase structure of the Zn-Mg alloy vapor-deposited steel sheet was examined by X-ray diffraction, it was found that the Zn-Mg alloy had excellent workability.
Mg 2 Z which is an intermetallic compound of Zn and Mg in the Mg plating layer
one or two selected from the group consisting of n 11 , MgZn 2 and MgZn
Composed of more than one species, or a small amount of Zn
(Η phase). On the other hand, in the range where the workability is deteriorated, a structure mainly composed of Zn (η phase), a Mg single phase or another intermetallic compound (Mg 7 Zn 3 ) other than the above appeared.
この様にMg2Zn11，MgZn2,MgZnの１種又は２種以上を
主体とする（又はこれらに一部Znを含んだ）相構造を有
するめっき層のみが良好な加工性を示す理由については
明らかでないが、これらの金属間化合物の硬さが素地鋼
板や金型の硬さにより近いことに起因していると考えら
れる。即ち加工を受けたときにめっき層が素地鋼板に追
随して変形可能な為、上述した様なパウダリング現象が
起こる恐れもなく、又ある程度の硬さを有しているので
金型への付着も発生し難いと考えられる。しかしながら
Zn含有量を多くすると（即ちMg含有量を少なくすると）
柔かいZn（η相）が主体となり、又逆にMg含有量を多く
しても柔らかいMg単独相や好ましくない金属間化合物
（Mg7Zn3）が出現してくる様になる。The reason why only the plating layer having a phase structure mainly composed of one or more of Mg 2 Zn 11 , MgZn 2 , and MgZn (or partially containing Zn) shows good workability. Although it is not clear, it is considered that the hardness of these intermetallic compounds is due to being closer to the hardness of the base steel sheet and the mold. That is, since the plating layer can be deformed following the base steel sheet when it is processed, there is no possibility that the above-mentioned powdering phenomenon occurs, and since it has a certain degree of hardness, it adheres to the mold. Is also considered to be unlikely to occur. However
Increasing the Zn content (ie decreasing the Mg content)
The main component is soft Zn (η phase). Conversely, even if the Mg content is increased, a soft Mg single phase or an undesirable intermetallic compound (Mg 7 Zn 3 ) appears.
本発明はめっき層の相構造に特徴を有するものであり
めっき組成については何ら限定するものではないが、加
工性及び耐食性の両特性を兼ね備えるという観点からす
れば、即ち優れた耐食性を示すMg含有量の範囲内（0.5
〜40重量％）で優れた加工性（めっき剥離量が1g/cm2程
度以下）を得るという観点からすれば、Mg含有量は３〜
30％程度とするのが好ましい（前記第１図参照）。但し
同程度のMg含有量のZn−Mg合金層においても、めっき操
作条件の違いによってMg相の存在する場合や存在しない
場合があり、Mg含有量は一概に規定できない。例えば基
板温度が低い場合やるつぼ間の距離が遠い場合には合金
化されにくく、これらの蒸着めっき操作条件の違いによ
ってMg含有量は同程度であってもZn−Mg合金層に違いが
生じる。The present invention is characterized by the phase structure of the plating layer and does not limit the plating composition at all, but from the viewpoint of having both properties of workability and corrosion resistance, that is, containing Mg showing excellent corrosion resistance. In the range of quantity (0.5
From the viewpoint of obtaining excellent workability (the amount of plating peeling is about 1 g / cm 2 or less) at a Mg content of 3 to 40% by weight.
It is preferably about 30% (see FIG. 1). However, even in a Zn—Mg alloy layer having the same Mg content, the Mg phase may or may not be present depending on the plating operation conditions, and the Mg content cannot be specified unconditionally. For example, when the substrate temperature is low or when the distance between the crucibles is long, alloying is difficult, and a difference occurs in the Zn—Mg alloy layer even if the Mg content is almost the same due to the difference in these vapor deposition plating operation conditions.
尚本発明では蒸着法によってZn−Mg合金めっきを施し
たものに限定しているが、これらは次の様な理由による
ものである。Although the present invention is limited to a Zn-Mg alloy plated by a vapor deposition method, these are based on the following reasons.
即ちZn−Mg合金についても従来の溶融めっき法によっ
てめっき層を形成することが可能であり又一部実用化さ
れているのであるが、Mgは非常に酸化しやすいため溶融
めっき法の場合はめっき浴中のMg含有量を増大させるこ
とができず、本発明における推奨範囲よりもはるかに少
ないMg含有量に止めなければならず、また鋼板に熱処理
組織が現われたり、めっき層と鋼板との界面にFe−Zn系
等の金属間化合物層が形成され、後の成形加工時に悪影
響を及ぼす。又通常の水溶液による電気めっき法を採用
しようとしても、Mgの酸化還元電位が卑でありすぎるこ
とからMgの析出が起こらずZn−Mg合金めっき層を形成す
ることが困難である。That is, it is possible to form a plating layer by a conventional hot-dip plating method also for a Zn-Mg alloy, and it is partly put into practical use.However, in the case of the hot-dip plating method, Mg is very easily oxidized. The Mg content in the bath cannot be increased, the Mg content must be reduced to much less than the recommended range in the present invention, and a heat treated structure appears on the steel sheet, or an interface between the plating layer and the steel sheet. An intermetallic compound layer such as a Fe-Zn system is formed on the substrate, which has an adverse effect on subsequent forming. Further, even if an attempt is made to adopt an ordinary electroplating method using an aqueous solution, since the oxidation-reduction potential of Mg is too low, Mg does not precipitate and it is difficult to form a Zn-Mg alloy plating layer.
しかしながらたとえば真空蒸着法を採用し、ZnとMgを
夫々別個のるつぼで加熱蒸発させ、その上部に素地鋼板
を配置して該鋼板上にZnとMgを蒸着させる方法を採用す
れば、各るつぼの加熱温度を適当にコントロールするこ
とによってZnとMgの蒸発量を任意に調節することがで
き、それに伴ってめっき合金の成分組成を任意に変更す
ることができる。尚蒸着は蒸着金属の酸化を防止するた
め真空下で行なうのが通例であるが、本発明においても
例外ではなく、通常は圧力が10-2Torr程度以下の真空条
件下で行なわれる。Zn及びMgの加熱にはどの様な手段を
採用してもよく、特にZnは融点が低く（419℃）且つ蒸
気圧も高いので一般の電気抵抗加熱でも十分に目的を果
たすことができる。何れにしてもZnとMgの加熱温度を夫
々独立してコントロールすることによって両金属の蒸発
量の比率を自由に調節することができるので、蒸着めっ
き層を構成するZn−Mgの構成比率等を自由に変えること
ができる。しかも蒸着めっきは前述の如く高真空条件下
で行なわれるので鋼板のめっき層付着面に酸化物被膜が
形成されて密着性が低下する様な恐れはなく、又めっき
層と鋼板との界面に脆弱な金属間化合物が形成されて層
間接合力が低下する様な恐れもない。尚蒸着めっきを行
なう際の具体的な手法は格別特殊なものではなく、たと
えば真空室内で別個のるつぼからZnとMgを同時に加熱蒸
発させ、その上方部に適度に加温した鋼板を走行させな
がら連続的に蒸着めっきを行なう方法、あるいは上記操
作をバッチ方式で実施する方法等を採用することがで
き、更に金属蒸気をイオン化させて基材表面に付着させ
るイオンプレーティング法も本発明で採用される蒸着め
っき法の１種として適用可能である。However, for example, adopting a vacuum evaporation method, heating and evaporating Zn and Mg in separate crucibles respectively, and adopting a method of disposing Zn and Mg on the steel sheet by disposing a base steel plate thereon, By appropriately controlling the heating temperature, the evaporation amount of Zn and Mg can be arbitrarily adjusted, and accordingly, the composition of the plating alloy can be arbitrarily changed. Although deposition is carried out under vacuum to prevent oxidation of the deposited metal is usually no exception in this invention, typically the pressure is carried out under vacuum conditions of below about 10 -2 Torr. Any means may be employed for heating Zn and Mg. Particularly, since Zn has a low melting point (419 ° C.) and a high vapor pressure, general electric resistance heating can sufficiently achieve its purpose. In any case, by independently controlling the heating temperature of Zn and Mg, the ratio of the evaporation amount of both metals can be freely adjusted, so that the composition ratio of Zn-Mg constituting the vapor-deposited plating layer can be adjusted. You can change it freely. In addition, since vapor deposition plating is performed under high vacuum conditions as described above, there is no danger that an oxide film will be formed on the surface of the steel sheet where the plating layer is attached and the adhesion will be reduced, and the interface between the plating layer and the steel sheet will be fragile. There is no danger that the intermetallic compound is formed and the interlayer bonding force is reduced. Note that the specific method of performing vapor deposition plating is not particularly special, for example, heating and evaporating Zn and Mg simultaneously from separate crucibles in a vacuum chamber, and running a moderately heated steel sheet over the upper part. A method of continuously performing vapor deposition plating, a method of performing the above operation in a batch system, or the like can be adopted. Further, an ion plating method of ionizing metal vapor and attaching it to the substrate surface is also employed in the present invention. This is applicable as one type of vapor deposition plating method.
［実施例］ 前処理を施した冷延鋼板に各種組成のZn−Mg合金蒸着
めっきを形成した（めっき付着量はいずれも20g/m2）。
これらについてＸ線回折によってめっき層の相構造を調
査すると共に、加工性及び耐食性について調査する。尚
加工性についてはドロービート試験によるめっき剥離量
で評価し、耐食性についてはドロービート試験の前後の
試料について塩水噴霧試験を行ない、赤錆発生までの時
間で示した。又比較例として、電気めっき法によってZn
めっきを施したもの（試料No.8）とZn−Niめっきを施し
たもの（試料No.9）についても同様の調査を行なった。EXAMPLES pretreated cold rolled steel sheet subjected to the formation of the Zn-Mg alloy vapor deposition plating various compositions (coating weight Both 20g / m 2).
For these, the phase structure of the plating layer is investigated by X-ray diffraction, and the workability and corrosion resistance are investigated. The workability was evaluated by the amount of plating peeling by a draw beat test, and the corrosion resistance was indicated by the time until the occurrence of red rust by performing a salt spray test on samples before and after the draw beat test. As a comparative example, Zn was deposited by electroplating.
The same investigation was performed on the plated (Sample No. 8) and the Zn-Ni plated (Sample No. 9).
これらの結果を一括して第１表に示す。 Table 1 summarizes these results.
第１表の結果からも明らかであるが、本発明に係る表
面処理鋼板は加工性に優れており、又それに伴なって加
工後の耐食性劣化は殆ど認められなかった。これに対し
電気Znめっき鋼板（No.8）は加工前の耐食性に劣るばか
りか加工性においても本発明の処理鋼板に比べて遥かに
劣った性能を示した。又電気Zn−Niめっき鋼板（No.9）
は、加工前の耐食性には優れているものの加工性につい
ては本発明の処理鋼板より劣り、それに伴なって加工後
の耐食性において大幅な性能劣化を示した。尚試料No.6
はMg含有量が少ないことに伴ない、Mg2Zn11の金属間化
合物が微量しか含まれずZnが主体となるめっき層が形成
されている為加工性及び耐食性のいずれにおいても劣
る。又試料No.7は試料No.5（実施例）と同量のMg含有量
であるが、前記した蒸着めっき条件の違いによってMg単
独相が発生し、加工性の劣化、従って加工後の耐食性劣
化が認められた。 As is clear from the results shown in Table 1, the surface-treated steel sheet according to the present invention was excellent in workability, and the corrosion resistance after working was hardly deteriorated. On the other hand, the electro-zinc plated steel sheet (No. 8) exhibited not only inferior corrosion resistance before working but also much inferior workability in comparison with the treated steel sheet of the present invention. Electric Zn-Ni plated steel sheet (No. 9)
Although the steel had excellent corrosion resistance before processing, the workability was inferior to that of the treated steel sheet of the present invention, and accordingly, the corrosion resistance after processing showed a significant deterioration in performance. Sample No.6
With a low Mg content, a very small amount of Mg 2 Zn 11 intermetallic compound is contained and a plated layer mainly composed of Zn is formed, so that both the workability and the corrosion resistance are inferior. Sample No. 7 has the same Mg content as Sample No. 5 (Example). However, a Mg single phase is generated due to the above-described difference in the vapor deposition plating conditions, and the workability is deteriorated. Deterioration was observed.
［発明の効果］ 以上述べた如く本発明によれば、既述の構成を採用す
ることによって、プレス成形性に優れた表面処理鋼板が
実現でき、この表面処理鋼板によって成形後の耐食性劣
化防止を達成することができる。[Effects of the Invention] As described above, according to the present invention, a surface-treated steel sheet excellent in press formability can be realized by employing the above-described configuration, and the surface-treated steel sheet can be used to prevent corrosion resistance deterioration after forming. Can be achieved.
【図面の簡単な説明】 第１図は蒸着Zn−Mgめっき鋼板におけるMg含有量と、ド
ロービート試験によるめっき剥離量との関係を示すグラ
フである。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing the relationship between the Mg content in a vapor-deposited Zn-Mg plated steel sheet and the amount of plating peeling by a draw beat test.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川福 純司 兵庫県神戸市東灘区魚崎中町１―１―24 (56)参考文献 特開 昭62−112766（ＪＰ，Ａ) 特公 昭46−3644（ＪＰ，Ｂ１) ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Junji Kawafuku 1-1-24 Uozakinakacho, Higashinada-ku, Kobe City, Hyogo Prefecture (56) References JP-A-62-112766 (JP, A) (JP, B1)
Claims (2)
層が形成されると共に、前記めっき層は主としてMg2Zn
11，MgZn2,MgZnよりなる群から選択される金属間化合物
の１種又は２種以上から構成され、且つMg単独相を含ん
でいないものであることを特徴とするプレス成形性の優
れた表面処理鋼板。A vacuum-deposited plating layer of a Zn-Mg alloy is formed on a base steel sheet, and the plating layer is mainly composed of Mg 2 Zn.
11, MgZn 2, is composed of one or more intermetallic compounds selected from the group consisting of MgZn, press formability and is characterized in that one contains no Mg alone phase excellent surface Treated steel sheet.
範囲第１項に記載の表面処理鋼板。2. The surface-treated steel sheet according to claim 1, which contains a single phase of Zn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62297984A JP2624272B2 (en) | 1987-11-26 | 1987-11-26 | Surface treated steel sheet with excellent press formability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62297984A JP2624272B2 (en) | 1987-11-26 | 1987-11-26 | Surface treated steel sheet with excellent press formability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01139755A JPH01139755A (en) | 1989-06-01 |
| JP2624272B2 true JP2624272B2 (en) | 1997-06-25 |
Family
ID=17853630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62297984A Expired - Lifetime JP2624272B2 (en) | 1987-11-26 | 1987-11-26 | Surface treated steel sheet with excellent press formability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2624272B2 (en) |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1235412A (en) * | 1969-01-10 | 1971-06-16 | Jones & Laughlin Steel Corp | Improvements in or relating to processes of vacuum-vapor depositing a binary metal coating on a substrate |
| DE2011584A1 (en) * | 1969-10-15 | 1971-04-29 | Republic Steel Corp | Zinc magnesium alloy vapour plating on steel - supports |
-
1987
- 1987-11-26 JP JP62297984A patent/JP2624272B2/en not_active Expired - Lifetime
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Also Published As
| Publication number | Publication date |
|---|---|
| JPH01139755A (en) | 1989-06-01 |
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