JP2988985B2 - Method for producing alloyed hot-dip galvanized steel sheet excellent in plating appearance and film workability - Google Patents
Method for producing alloyed hot-dip galvanized steel sheet excellent in plating appearance and film workabilityInfo
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- JP2988985B2 JP2988985B2 JP2219094A JP21909490A JP2988985B2 JP 2988985 B2 JP2988985 B2 JP 2988985B2 JP 2219094 A JP2219094 A JP 2219094A JP 21909490 A JP21909490 A JP 21909490A JP 2988985 B2 JP2988985 B2 JP 2988985B2
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- Japan
- Prior art keywords
- steel sheet
- plating
- dip galvanized
- galvanized steel
- alloyed hot
- Prior art date
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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、自動車車体用表面処理鋼板として使用され
るプレス成形時に必要とされる耐パウダリング性，耐フ
レーキング性に優れた合金化溶融Znめっき鋼板に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an alloyed melt excellent in powdering resistance and flaking resistance required at the time of press forming used as a surface-treated steel sheet for an automobile body. It relates to a galvanized steel sheet.
＜従来の技術＞ 一般的に、合金化溶融Znめっき鋼板は溶融Znめっきを
施した後、合金化炉でZnの融点以上に加熱してめっき層
をFeとZnからなる合金、すなわち鋼板側からΓ，δ1,ζ
の各相からなる合金層としたものである。<Prior art> In general, an alloyed hot-dip galvanized steel sheet is subjected to hot-dip Zn plating, and then heated in an alloying furnace to a temperature equal to or higher than the melting point of Zn to form an alloy of Fe and Zn, that is, from the steel sheet side. Γ, δ 1 , ζ
This is an alloy layer composed of the respective phases.
この合金化溶融Znめっき鋼板は、優れた塗装後耐食性
および溶接性を兼備しているため、自動車，家電，建材
用素材として多用されている。This alloyed hot-dip galvanized steel sheet has excellent corrosion resistance and weldability after painting, and is therefore frequently used as a material for automobiles, home appliances, and building materials.
家電，建材では比較的軽度の加工で使用されるが、自
動車等では厳しい絞り加工が行われる。Although it is used for relatively light processing in home appliances and building materials, severe drawing processing is performed in automobiles and the like.
このため自動車鋼板としてプレス成形性を付与する目
的で、Ti＋Nbを添加した極低炭素鋼を素材としている。For this reason, ultra-low carbon steel with Ti + Nb added is used as a material for the purpose of imparting press formability as an automobile steel sheet.
このTi＋Nb含有鋼は、一般の冷延鋼板に比べ溶融Znと
の反応性が高いので溶融Znめっき時に鋼板とめっき層界
面に合金層が異常成長し、めっき密着性が劣る場合が多
い。Since the Ti + Nb-containing steel has higher reactivity with molten Zn than a general cold-rolled steel sheet, an alloy layer abnormally grows at the interface between the steel sheet and the plating layer during hot-dip Zn plating, and the plating adhesion is often poor.
またその後に合金化処理して合金化溶融Znめっき鋼板
を製造する際、一般の冷延鋼板と同様の合金化条件で
は、オーバーベイクとなってパウダリング性が著しく劣
るという欠点がある。Further, when an alloyed hot-dip galvanized steel sheet is manufactured by an alloying process thereafter, there is a defect that under alloying conditions similar to those of a general cold-rolled steel sheet, overbaking occurs and powdering properties are remarkably deteriorated.
また、Ti＋Nb含有鋼は、合金化処理後のめっき表面に
ライン方向に白い筋状模様や山形模様の欠陥が発生する
場合が多く、これはめっき外観を損なうだけでなくこの
部分のパウダリング性も劣る。In addition, in the case of Ti + Nb-containing steel, white streaks or chevron-shaped defects often occur in the line direction on the plated surface after alloying treatment, which not only impairs the plating appearance but also reduces the powdering properties of this part. Inferior.
このパウダリングは高Fe％の合金化溶融Znめっき鋼板
ほど、合金層構造で言えばΓ相が厚く形成するほど発生
しやすいことが知られている。It is known that this powdering is more likely to occur in alloyed hot-dip Zn-plated steel sheets with a higher Fe%, and as the Γ phase is formed thicker in terms of the alloy layer structure.
そこでパウダリングを抑制するために、Γ相の形成を
抑制したζ相主体の合金層にしているのが一般的である
が、一方でこのζ相主体のめっき層はプレス時に隣片状
剥離、いわゆるフレーキングしやすいという欠点があ
る。Therefore, in order to suppress powdering, it is common to use a ζ phase-based alloy layer in which the formation of a 抑制 phase is suppressed. There is a disadvantage that it is so-called flaking.
この合金化溶融Znめっき鋼板のフレーキング性および
パウダリング性については、薄目付（45g/m2以下）の場
合比較的問題は少ないが近年、厚目付合金化溶融Znめっ
き鋼板の要求が増し、さらに一層の耐フレーキング性お
よび耐パウダリング性に優れた合金化溶融Znめっき鋼板
の開発が強く要望されてきた。The flaking and powdering properties of this alloyed hot-dip galvanized steel sheet have relatively few problems in the case of thinner (45 g / m 2 or less), but in recent years the demand for thicker alloyed hot-dip galvanized steel sheet has increased. There has been a strong demand for the development of an alloyed hot-dip galvanized steel sheet having even better flaking and powdering resistance.
これらの耐フレーキング性および耐パウダリング性改
善に関しての従来技術としては、例えば特開昭64−6845
6号公報，特開平１−136952号公報ではめっき層中Fe％
を低Fe％にしてΓ相の形成を抑制したり、合金化溶融Zn
めっき鋼板のめっき上層にFe系めっきを行う方法、また
特開平１−172553号公報では、めっき層中Fe％を高Fe％
にしてζ相のないδ1,Γ相からなる層にする方法が提案
されている。Conventional techniques for improving the flaking resistance and powdering resistance include, for example, JP-A-64-6845.
No. 6, JP-A-1-136952 discloses that Fe%
Low Fe% to suppress the formation of the 低 phase,
In the method of performing Fe-based plating on a plating upper layer of a plated steel sheet, and in Japanese Patent Application Laid-Open No. 1-172553, Fe% in a plating layer is changed to high Fe%.
There has been proposed a method of forming a layer composed of δ 1 without Γ phase and Γ phase.
これらの方法によってパウダリング，フレーキングは
ある程度抑制されるものの、市販の合金化溶融Znめっき
鋼板を入手し調査したところ、Γ相が形成したδ１＋Γ
相主体の合金層構造をもつものがほどんどで現状では対
策が十分とはいえない。Although powdering and flaking are suppressed to some extent by these methods, a commercially available alloyed hot-dip galvanized steel sheet was obtained and investigated, and it was found that δ 1 + Γ
Most of them have a phase-based alloy layer structure, and at present the measures are not sufficient.
一方、めっき外観を損なう白い筋状欠陥については、
本発明者らは特開平２−1746号公報でめっき条件を規制
してその対策を示したが、まだ十分とはいえない。On the other hand, for white streak defects that impair the plating appearance,
The present inventors have regulated plating conditions in Japanese Patent Application Laid-Open No. 2-1746, and have shown countermeasures, but this is not yet satisfactory.
＜発明が解決しようとする課題＞ 本発明の目的は、Ti＋Nb含有鋼を素材にした溶融Znめ
っき鋼板を製造する上で発生しやすい下記の３つの現
象、すなわちTi＋Nb含有鋼は一般の冷延鋼板に比べ、
溶融Znとの反応性が高いのでめっき時に鋼板とめっき層
界面に合金層が異常成長し、溶融Znめっき鋼板そのもの
のめっき密着性が劣るとともにその後の合金化処理にお
いて通常の冷延鋼板と同様の合金化条件ではオーバーベ
イクとなって耐パウダリング性が劣ること、Ti＋Nb含
有鋼を素材にした場合、合金化処理後のめっき表面に発
生する白い筋状および山形状欠陥がめっき外観を害し、
また耐パウダリング性を低下させること、耐パウダリ
ング性改善から低Fe％としてζ相主体のめっき層にする
と一方でプレス時にフレーキングしやすいこと等を改善
し、外観及び耐パウダリング性，耐フレーキング性に優
れた合金化溶融Znめっき鋼板の製造方法を提供するもの
である。<Problems to be Solved by the Invention> The object of the present invention is to produce the following three phenomena that are likely to occur when manufacturing a hot-dip galvanized steel sheet using a Ti + Nb-containing steel as a material: compared to,
Since the reactivity with hot-dip Zn is high, the alloy layer abnormally grows at the interface between the steel sheet and the coating layer during plating, and the plating adhesion of the hot-dip Zn-coated steel sheet itself is inferior. Under the conditions of alloying, powdering resistance is inferior due to overbaking, and when using Ti + Nb-containing steel as a material, white streaks and mountain-shaped defects generated on the plating surface after alloying treatment impair the plating appearance,
In addition, reducing the powdering resistance, and improving the powdering resistance by using a low-Fe-% plating layer consisting mainly of a phase, on the other hand, improving the ease of flaking during pressing, etc., and improving the appearance and powdering resistance. An object of the present invention is to provide a method for producing a galvannealed steel sheet having excellent flaking properties.
＜課題を解決するための手段＞ 本発明は、C:0.01wt％以下、Si:0.1wt％、Ａ:0.1wt
％以下を含有し、さらにTiとNbの両者を、合計で0.1wt
％以下を含有する冷延鋼板の表面に溶融Znめっき後、合
金化処理を行う合金化溶融Znめっき鋼板を製造方法にお
いて、Ａを0.12〜0.16wt％含有する溶融Znめっき浴中
で、下記（１）式を満足する侵入板温Ｔ（℃）で溶融Zn
めっき後、合金化処理を行うことを特徴とするめっき外
観及び皮膜加工性に優れた合金化溶融Znめっき鋼板の製
造方法である。<Means for Solving the Problems> The present invention provides: C: 0.01 wt% or less, Si: 0.1 wt%, A: 0.1 wt%
% Or less, and both Ti and Nb are added in a total of 0.1 wt%.
% Or less in a hot-dip galvanized steel sheet containing 0.12 to 0.16 wt% of A in a method of manufacturing an alloyed hot-dip galvanized steel sheet in which the surface of a cold-rolled steel sheet containing not more than 0.1% by weight is subjected to alloying treatment. 1) Molten Zn at penetration plate temperature T (° C) that satisfies equation
This is a method for producing an alloyed hot-dip galvanized steel sheet having excellent plating appearance and film workability, characterized by performing an alloying treatment after plating.
（−800A−530）−20≦Ｔ≦（−800A＋530）＋20 ……（１） 但し（１）式において、Ａは鋼中のTi＋Nb含有量（wt
％）を示す。(−800A−530) −20 ≦ T ≦ (−800A + 530) +20 (1) However, in the formula (1), A represents the Ti + Nb content in steel (wt
%).
＜作用＞ 以下、本発明を詳細に説明する。<Operation> Hereinafter, the present invention will be described in detail.
まず素材成分の限定理由について説明する。 First, the reasons for limiting the material components will be described.
C:Cは鋼中に不可避的不純物元素として含有され、鋼
板のプレス成形性を阻害する元素である。C: C is an element contained in steel as an unavoidable impurity element and impairs the press formability of the steel sheet.
Tiを添加しTiCとして鋼中に固定されれば、その害は
著しく軽減されるものの0.01wt％超ではTiCとしてＣを
固定するのに必要なTi量が増し、かつ多量にTiCが鋼中
に分散することにより材質劣化が著しいため0.01wt％以
下とする。If Ti is added and fixed in steel as TiC, the harm is remarkably reduced, but if it exceeds 0.01 wt%, the amount of Ti required to fix C as TiC increases, and a large amount of TiC is contained in the steel. Since the material is significantly deteriorated due to dispersion, the content is set to 0.01 wt% or less.
Si:一般に鋼中Siは溶融金属との濡れ性を阻害し、不
めっき欠陥の発生を助長する。Si: In general, Si in steel inhibits wettability with a molten metal and promotes generation of non-plating defects.
0.1wt％超え含有すると不めっき欠陥が発生しやすく
なるのでSiの上限は0.1wt％とする。If the content exceeds 0.1 wt%, non-plating defects are likely to occur, so the upper limit of Si is set to 0.1 wt%.
Ａ:Aは鋼中にTiまたはNbを添加する際に脱酸剤と
して使用することによりTi,Nbの歩留まり向上と清浄な
表面を得るため有効である。A: A is effective for improving the yield of Ti and Nb and obtaining a clean surface by using it as a deoxidizing agent when adding Ti or Nb to steel.
しかし、Ａが0.1wt％超えでは鋼板の延性が劣化す
るため0.1wt％以下とする。However, if A exceeds 0.1 wt%, the ductility of the steel sheet deteriorates, so the content is set to 0.1 wt% or less.
Ti:Tiを鋼中に添加することによりC,NをそれぞれTiC,
TiNとして固定し、これら不純物元素が鋼板のプレス成
形性に及ぼす悪影響を削減せしめ、高い延性と高ｒ値を
有する鋼板を製造することが可能である。Ti: By adding Ti into steel, C and N can be changed to TiC,
By fixing as TiN, it is possible to reduce the adverse effect of these impurity elements on the press formability of the steel sheet, and to manufacture a steel sheet having high ductility and a high r value.
しかし0.1wt％超のTiを含有すると、合金化処理にお
ける焼けむら発生の原因となるので上限を0.1wt％とす
る。However, if the content of Ti exceeds 0.1 wt%, it causes the occurrence of uneven burning in the alloying treatment. Therefore, the upper limit is set to 0.1 wt%.
Nb:NbもTiも同様な働きをし、高い延性と高ｒ値をえ
るのに必要な元素である。Nb: Nb and Ti perform the same function, and are elements necessary for obtaining high ductility and high r value.
Nbの含有量は特に規制しないが、Nb＋Tiが0.1wt％超
になると、常温で鋼板の延性が低下しプレス成形性を阻
害するので、Nb＋Ti含有量は0.1wt％以下に限定する。Although the content of Nb is not particularly limited, if the content of Nb + Ti exceeds 0.1 wt%, the ductility of the steel sheet decreases at normal temperature and the press formability is impaired, so the Nb + Ti content is limited to 0.1 wt% or less.
以下述べたTi＋Nb含有鋼板を素材に0.12〜0.16％のＡ
を含有する溶融Znめっき浴で、下記（１）式を満足す
る侵入板温Ｔ（℃）で溶融Znめっき後、合金化処理すれ
ば、めっき外観及び耐パウダリング性，耐フレーキング
性に優れた合金化溶融Znめっき鋼板が得られる。0.12 to 0.16% of A using Ti + Nb-containing steel sheet described below
After hot-dip Zn plating at a penetration plate temperature T (° C.) that satisfies the following equation (1) in a hot-dip Zn plating bath containing aluminum, alloying treatment results in excellent plating appearance, powdering resistance, and flaking resistance. An alloyed hot-dip galvanized steel sheet is obtained.
（−800A＋530）−20≦Ｔ≦（−800A＋530）＋20 ……（１） 但し（１）式において、Ａは鋼中のTi＋Nb含有量（wt
％）を示す。(−800A + 530) −20 ≦ T ≦ (−800A + 530) +20 (1) However, in the formula (1), A represents the Ti + Nb content in steel (wt
%).
本発明は、浴中Ａ濃度は一般の冷延鋼板と同じ0.12
〜0.16wt％、すなわち浴中Ａ％は変えずに鋼中のTi＋
Nb含有量によって侵入板温Ｔ（℃）を調整することで、
Ti＋Nb含有鋼板の合金化条件を見いだしたものである。In the present invention, the A concentration in the bath is 0.12, the same as that of a general cold-rolled steel sheet.
~ 0.16wt%, that is, A +
By adjusting the penetration plate temperature T (° C) according to the Nb content,
It finds alloying conditions for Ti + Nb-containing steel sheets.
Ti＋Nb含有量に応じた適正侵入板温Ｔ（℃）を第１図
に示した。FIG. 1 shows the proper penetration plate temperature T (° C.) according to the Ti + Nb content.
例えば、浴中Ａ濃度が0.12〜0.16wt％の範囲で、Ti
＋Nb含有量が0.04wt％では、侵入板温Ｔ（℃）の下限は
478℃、上限は518℃、Ti＋Nb含有量が0.10wt％では、侵
入板温Ｔ（℃）の下限は430℃、上限は470℃である。For example, when the A concentration in the bath is in the range of 0.12 to 0.16 wt%, Ti
When the + Nb content is 0.04 wt%, the lower limit of the penetration plate temperature T (° C) is
At 478 ° C., the upper limit is 518 ° C., and the Ti + Nb content is 0.10 wt%, the lower limit of the penetration plate temperature T (° C.) is 430 ° C. and the upper limit is 470 ° C.
浴中Ａ濃度の下限を0.12wt％としたのは、この濃度
未満ではめっき時にΓ相が形成しやすく、その後の合金
化処理によってパウダリング性が著しく劣るためであ
る。The reason why the lower limit of the A concentration in the bath is set to 0.12 wt% is that if the concentration is less than this, a Γ phase is easily formed during plating, and the powdering property is remarkably deteriorated by the subsequent alloying treatment.
また、浴中Ａ濃度の上限を0.16wt％としたのは、こ
の濃度以上では侵入板温を適正範囲に管理しても、η相
が残存したり、ζ相が必要以上に厚く形成して、焼けむ
らやフレーキングが発生しやすいためである。Also, the upper limit of the A concentration in the bath is set to 0.16 wt%. If the concentration is higher than this, the η phase remains or the ζ phase is formed unnecessarily thick even if the penetration plate temperature is controlled within an appropriate range. This is because uneven burning and flaking are likely to occur.
また、侵入板温Ｔ（℃）が（−800A＋530）−20℃
（但し、Ａは鋼中のTi＋Nb含有量（wt％）を示す）未満
では、Ａ富化層が必要以上に厚く形成しやすく、また
（−800A＋530）＋20℃超では、逆にＡ富化層が不均
一に形成しやすく結果的にめっき外観及び耐パウダリン
グ性，耐フレーキング性に優れた合金化処理範囲が著し
く狭くなる。In addition, the penetration plate temperature T (° C) is (-800A + 530) -20 ° C
When A is less than the Ti + Nb content (wt%) in the steel, the A-enriched layer is easily formed thicker than necessary. On the other hand, when (−800A + 530) + 20 ° C., the A-enriched layer is conversely formed. Is easily formed unevenly, and consequently the range of alloying treatment which is excellent in plating appearance, powdering resistance and flaking resistance is remarkably narrowed.
以上述べたように、Ti＋Nb含有鋼板を素材に合金化溶
融Znめっき鋼板を製造するには、浴中Ａ濃度を変えず
に鋼中のTi＋Nb含有量に応じて侵入板温Ｔ（℃）を調整
すれば、めっき外観及び耐パウダリング性，耐フレーキ
ング性に優れた製品が得られる。As described above, in order to manufacture an alloyed hot-dip galvanized steel sheet using a Ti + Nb-containing steel sheet as a material, the penetration plate temperature T (° C.) is adjusted according to the Ti + Nb content in the steel without changing the A concentration in the bath. By doing so, a product excellent in plating appearance, powdering resistance and flaking resistance can be obtained.
＜実施例＞ 本発明の実施例を以下に説明する。<Example> An example of the present invention will be described below.
第１表に示す組成のTi＋Nb含有鋼を用いて、鋼中のTi
＋Nb含有量に応じて侵入板温Ｔ（℃）を変えて溶融Znめ
っきした場合のＡ富化層およびめっき密着性の調査結
果を第２表に、また、第２表と同一条件で溶融Znめっき
後合金化処理して、同様にめっき特性（外観、めっき層
構造、Fe％、パウダリング性およびフレーキング性）を
調べた結果を第３表に示した。Using Ti + Nb-containing steel having the composition shown in Table 1, Ti
Table 2 shows the results of investigation on the A-enriched layer and plating adhesion when hot-dip Zn plating is performed with the penetration plate temperature T (° C.) changed according to the + Nb content. Table 3 shows the results of similarly examining the plating characteristics (appearance, plating layer structure, Fe%, powdering properties and flaking properties) after alloying treatment after plating.
＜発明の効果＞ 近年、自動車用表面処理鋼板として塗装後耐食性が優
れている合金化溶融Znめっき鋼板の使用が増大してお
り、Ti＋Nb含有鋼板は合金化処理溶融Znめっき鋼板とし
てめっき外観が損なわれ、安定したプレス成形性が得ら
れにくいが、以上説明したように本発明によるめっき条
件で溶融Znめっきし合金化処理すれば、自動車用表面処
理鋼板としてめっき外観及び耐パウダリング性，耐フレ
ーキング性に優れた高品質合金化溶融Znめっき鋼板の製
造が可能であり、これによって益々需要拡大が期待でき
る。 <Effects of the Invention> In recent years, the use of alloyed hot-dip galvanized steel sheets having excellent corrosion resistance after painting as surface-treated steel sheets for automobiles has been increasing, and the appearance of Ti + Nb-containing steel sheets has been impaired as alloyed hot-dip galvanized steel sheets. Although it is difficult to obtain stable press formability, as described above, if hot-dip Zn plating and alloying treatment are performed under the plating conditions according to the present invention, plating appearance, powdering resistance, and flame resistance can be obtained as a surface-treated steel sheet for automobiles. It is possible to manufacture high-quality alloyed hot-dip galvanized steel sheets with excellent king properties, which is expected to increase demand.
第１図は本発明の適正範囲のTi＋Nb含有量（wt％）と侵
入板温Ｔ（℃）の関係を示したグラフである。FIG. 1 is a graph showing the relationship between the Ti + Nb content (wt%) in the proper range of the present invention and the penetration plate temperature T (° C.).
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−40353（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C23C 2/00 - 2/40 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-40353 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C23C 2/00-2/40
Claims (1)
％以下を含有し、さらにTiとNbの両者を、合計で0.1wt
％以下を含有する冷延鋼板を表面に溶融Znめっき後、合
金化処理を行う合金化溶融Znめっき鋼板の製造方法にお
いて、Ａを0.12〜0.16wt％含有する溶融Znめっき浴中
で、下記（１）式を満足する侵入板温Ｔ（℃）で溶融Zn
めっき後、合金化処理を行うことを特徴とするめっき外
観及び皮膜加工性に優れた合金化溶融Znめっき鋼板の製
造方法。 （−800A−530）−20≦Ｔ≦（−800A＋530）＋20 ……（１） 但し（１）式において、Ａは鋼中のTi＋Nb含有量（wt
％）を示す。1. C: 0.01 wt% or less, Si: 0.1 wt%, A: 0.1 wt%
% Or less, and both Ti and Nb are added in a total of 0.1 wt%.
% Of a cold-rolled steel sheet containing not more than 0.1% by weight of A in a hot-dip galvanizing bath containing 0.12 to 0.16 wt% of A, 1) Molten Zn at penetration plate temperature T (° C) that satisfies equation
A method for producing an alloyed hot-dip galvanized steel sheet having excellent plating appearance and film workability, characterized by performing an alloying treatment after plating. (−800A−530) −20 ≦ T ≦ (−800A + 530) +20 (1) However, in the formula (1), A is the Ti + Nb content in steel (wt
%).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2219094A JP2988985B2 (en) | 1990-08-22 | 1990-08-22 | Method for producing alloyed hot-dip galvanized steel sheet excellent in plating appearance and film workability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2219094A JP2988985B2 (en) | 1990-08-22 | 1990-08-22 | Method for producing alloyed hot-dip galvanized steel sheet excellent in plating appearance and film workability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04103749A JPH04103749A (en) | 1992-04-06 |
| JP2988985B2 true JP2988985B2 (en) | 1999-12-13 |
Family
ID=16730167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2219094A Expired - Fee Related JP2988985B2 (en) | 1990-08-22 | 1990-08-22 | Method for producing alloyed hot-dip galvanized steel sheet excellent in plating appearance and film workability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2988985B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2679543B2 (en) * | 1992-08-20 | 1997-11-19 | 住友金属工業株式会社 | A method for producing an alloyed hot-dip galvanized steel sheet having excellent low temperature chipping resistance. |
| JP4508378B2 (en) * | 1999-12-20 | 2010-07-21 | 日新製鋼株式会社 | Manufacturing method of galvannealed steel sheet with excellent press formability |
| JP4720618B2 (en) * | 2006-05-29 | 2011-07-13 | 住友金属工業株式会社 | Alloyed hot-dip galvanized steel sheet and method for producing the same |
-
1990
- 1990-08-22 JP JP2219094A patent/JP2988985B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04103749A (en) | 1992-04-06 |
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