JPH03191045A - Alloyed hot-dip galvanized steel sheet having excellent press formability - Google Patents
Alloyed hot-dip galvanized steel sheet having excellent press formabilityInfo
- Publication number
- JPH03191045A JPH03191045A JP32720189A JP32720189A JPH03191045A JP H03191045 A JPH03191045 A JP H03191045A JP 32720189 A JP32720189 A JP 32720189A JP 32720189 A JP32720189 A JP 32720189A JP H03191045 A JPH03191045 A JP H03191045A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- steel sheet
- plating layer
- alloyed hot
- 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.)
- Granted
Links
- 229910001335 Galvanized steel Inorganic materials 0.000 title abstract 3
- 239000008397 galvanized steel Substances 0.000 title abstract 3
- 238000007747 plating Methods 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 230000003746 surface roughness Effects 0.000 claims abstract description 5
- 229910000640 Fe alloy Inorganic materials 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 46
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 238000000227 grinding Methods 0.000 abstract description 18
- 229910045601 alloy Inorganic materials 0.000 abstract description 11
- 239000000956 alloy Substances 0.000 abstract description 11
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000005246 galvanizing Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 23
- 238000000034 method Methods 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000005275 alloying Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 229920000298 Cellophane Polymers 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 101000993059 Homo sapiens Hereditary hemochromatosis protein Proteins 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 206010040844 Skin exfoliation Diseases 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000012999 compression bending Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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〉
本発明は、自動車車体用表面処理鋼板としてプレス成形
時に必要とする耐パウダリング性及び耐フレーキング性
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 hot-dip Zn-plated steel sheet with excellent powdering resistance and flaking resistance required during press forming as a surface-treated steel sheet for automobile bodies. It is something.
〈従来の技術〉
一般的に合金化熔融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の合金、即ち鋼板側から「、δ８、こ
の各相からなる合金層としたものである。<Prior art> In general, alloyed hot-dip Zn-plated steel sheets are made by applying hot-dip Zn plating and then heating to above the melting point of Zn in an alloying furnace to transform the plating layer into an alloy of Fe and Zn, that is, from the steel sheet side. , δ8, and an alloy layer consisting of these phases.
この合金化溶融Ｚｎめっき鋼板は優れた塗装後耐食性及
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。家電、建材等では比較的軽度
の加工で使用されるが、自動車等では蔽しい絞り加工が
行われる。This alloyed hot-dip Zn-plated steel sheet has excellent post-painting corrosion resistance and weldability, and is therefore widely used as a material for automobiles, home appliances, and building materials. It is used for relatively light processing in household appliances, building materials, etc., but heavy drawing processing is performed in automobiles, etc.
−Ｃに合金化溶融Ｚｎめっき鋼板は、プレス成形時にめ
っき層がワ）杖ばくり、いわゆるパウダリングが発生し
て、プリントスルー（押し疵）が発生しやすい。このパ
ウダリングは、高Ｆｅ％の合金化熔融Ｚｎめっき鋼板は
ど、合金層構造でいえば「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。-C alloyed hot-dip Zn-plated steel sheets are susceptible to print-through (depression flaws) due to the plating layer becoming loose during press forming, so-called powdering. It is known that this powdering occurs more easily in alloyed Zn-plated steel sheets with high Fe%, and in terms of alloy layer structure, the thicker the phase is formed, the more likely it is to occur.
そこで、パウダリングを抑制するために、めっき層中Ｆ
ｅ１４度を低Ｆｅ％にして、「相の形成を抑制したζ相
主体の合金層構造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、プレス加工時に鱗片状ば
くり、いわゆるフレーキングしゃずいという欠点がある
。即ち、プレス成形において「相が形成し成長した高Ｆ
ｅ％の合金化溶融Ｚｎめっき鋼板は、パウダリングしや
すく、逆にζ相が多い低Ｆｅ％の合金化熔融Ｚｎめっき
鋼板は、めっき層が比較的やわらかいため、型かじりを
起こし、フレーキングしやすい。この合金化溶融Ｚｎめ
っき鋼板のフレーキング性及びパウダリング性について
は、薄目（１１４５ｇ／ｎ（以下）の場合、比較的問題
は少ないが、近年厚目付合金化熔融Ｚｎめっき鋼板の要
求が増し、更に一層の耐フレーキング性及び耐パウダリ
ング性に優れた合金化溶融Ｚｎめっきｗ４仮の開発が強
く要望されてきた。Therefore, in order to suppress powdering, F in the plating layer was
Generally, the e14 degree is made low in Fe% to create an alloy layer structure mainly composed of ζ phase that suppresses the formation of phases. However, there is a drawback of so-called flaking resistance.In other words, in press molding, "high F.
E% alloyed hot-dip Zn-plated steel sheets are susceptible to powdering, while low Fe% alloyed hot-dip Zn-plated steel sheets, which have a large amount of ζ phase, cause mold galling and flaking because the plating layer is relatively soft. Cheap. Regarding the flaking and powdering properties of this alloyed hot-dip Zn-plated steel sheet, there are relatively few problems in the case of thin (1145 g/n (or less)), but in recent years the demand for thicker-gained alloyed hot-dip Zn-plated steel sheets has increased. Furthermore, there has been a strong demand for the development of alloyed hot-dip Zn plating w4 which has even better flaking resistance and powdering resistance.
〈発明が解決しようとする課題〉
これらの耐フレーキング性及び耐パウダリング性を改善
する技術に関しては、例えば特開昭６４−６８４５６号
公報、特開平１−１３６９５２号公報では、めっき層中
Ｆｅ’４度を低Ｆｅ％にしてｒ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
、ｒｅ濃度を高Ｆｅ％にして、ζ相のないδ１、「相か
らなる層にする方法等が提案されている。<Problems to be Solved by the Invention> Regarding techniques for improving flaking resistance and powdering resistance, for example, JP-A-64-68456 and JP-A-1-136952 disclose Fe in the plating layer. '4 degree is made low Fe% to suppress the formation of r phase,
In JP-A-1-172553, a method of applying Fe-based plating to the upper layer of an alloyed hot-dip Zn-plated steel sheet is described, in which the re concentration is increased to a high Fe% to form a layer consisting of a δ1 phase without a ζ phase. Several methods have been proposed.
これらの方法によってプレス成形時のパウダリング、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、「相が形
成し成長した、δ１＋ｒ相主体の合金層構造をもつもの
がほとんどで、現状では対策が十分とはいえない。Although powdering and flaking during press forming can be suppressed to some extent by these methods, when we obtained commercially available hot-dip Zn-plated steel sheets and investigated them, we found that "an alloy layer structure consisting mainly of the δ1+r phase, in which phases have formed and grown. Most of the cases have this problem, and countermeasures cannot be said to be sufficient at present.
本発明は、このような問題を解決したプレス成形性に優
れた合金化溶融Ｚｎめっき鋼板を提供することを目的と
する。An object of the present invention is to provide an alloyed hot-dip Zn-plated steel sheet that solves these problems and has excellent press formability.
く課題を解決するための手段〉
第１の発明は、鋼板表面に平均Ｆｅ含有率が７〜１１ｗ
ｔ％であり、ζ相１０〜６０ｗｔ％、残部が６１相と「
相からなり、素地鉄界面に形成される「相が０．４ｐｍ
以下のＺｎ −Ｐｅ合金めっき層を有し、かつ当該めっ
き層の表面粗度をＲｍ≦８μとしたことを特１故とする
プレス成形性に優れた合金化溶融Ｚｎめっき鋼板である
。Means for Solving the Problems〉 The first invention has an average Fe content of 7 to 11w on the surface of the steel sheet.
t%, the ζ phase is 10 to 60 wt%, and the balance is 61 phase.
The “phase” formed at the interface between the base iron and the steel is 0.4 pm.
This is an alloyed hot-dip Zn-plated steel sheet with excellent press formability, which has the following Zn-Pe alloy plating layer and has a surface roughness of Rm≦8μ.
また第２の発明は、鉄板表面に平均Ｆｅ含有率が７〜１
１ｗＬ％であり、ζ相１０〜６（ＩＨｔ％、残部が６１
相と「相からなり、素地鉄界面に形成される「相が０，
４μ躍以下のＺｎ −Ｆｅ合金めっき層を有し、その上
にＰ、 Ｎｉ、 Ｚｎのうちの１種を２０％以下含有し
、残部ＦｅからなるＦｅ系めっきを有することを特徴と
するプレス成形性に優れた合金化溶融Ｚｎめっき鋼牟反
である。Moreover, the second invention has an average Fe content of 7 to 1 on the surface of the iron plate.
1 wL%, ζ phase 10-6 (IHt%, the remainder is 61
phase and the phase formed at the interface between the base iron and the base iron.
Press forming characterized by having a Zn-Fe alloy plating layer with a thickness of 4μ or less, and having an Fe-based plating containing 20% or less of one of P, Ni, and Zn thereon, and the balance being Fe. This is an alloyed hot-dip Zn-plated steel with excellent properties.
〈作 用〉 以下に本発明を具体的に説明する。<For production> The present invention will be specifically explained below.
既に述べたように、一般に合金化溶融Ｚｎめっき鋼板の
めっき層中Ｐｅ％は、パウダリング抑制のため、低Ｆｅ
％濃度に管理しているが、本発明においても平均Ｆｅ含
有率を７〜１１ｗｔ％とし、めっき相構成としてζ相の
割合が１０〜６０％、残部が６１相と「相からなり素地
鉄界面に形成するｒ相が０．４Ｐｍ以下にすれば、パウ
ダリングが著しく向上することを見出した。As already mentioned, the Pe% in the plating layer of alloyed hot-dip Zn-plated steel sheets is generally low in order to suppress powdering.
% concentration, but in the present invention, the average Fe content is 7 to 11 wt%, and the plating phase composition is composed of ζ phase of 10 to 60%, and the remainder consisting of 61 phases and the base iron interface. It has been found that powdering can be significantly improved if the r-phase formed in the alloy is 0.4 Pm or less.
Ｆｅを７〜□１１ｗＬ％にしたのは、”１ｗｔ％以下で
あればη相が残存して焼けむらが発生しやすく、Ｆｅが
１１ｗｔ％以上になるとぐ相がほとんど形成せず（１０
ｗｔ％以下）、δ、相相体体合金層となるものの、「相
が０．４μｍ以上形成するので、パウダリングしやすく
なるためである。またＦｅ７〜１１ｗｔ％とし、ζ相の
割合をｌＯ〜６０−１％としたのは、１０ｗｔ％以下で
は上述のごとく、「相が厚く形成してパウダリング性が
劣り、６０ｗｔ％を超えるとぐ相がほとんどとなって著
しくフレーキングが発生しやすいためである。The reason for setting the Fe content to 7 to □11wL% is that ``If the Fe content is less than 1wt%, the η phase remains and uneven burning tends to occur, whereas if the Fe content is 11wt% or more, the η phase hardly forms (10wL% or less).
(wt% or less), δ, phase body alloy layer is formed, but the phase is formed with a thickness of 0.4 μm or more, making it easier to powder.Also, Fe is set to 7 to 11 wt%, and the ratio of ζ phase is lO The reason for setting it at ~60-1% is that, as mentioned above, if it is less than 10 wt%, the phase will form thickly and the powdering property will be poor, and if it exceeds 60 wt%, most of the phase will be thick and flaking will occur easily. It's for a reason.
以上述べたように、平均Ｆｅ含有率が７〜１１ｗｔ％で
、ζ相１０〜６０ｗｔ％、残部δ１相と「相としためっ
き層の合金化溶融Ｚｒｉめっき鋼板は、パウダリング性
と共にフレーキング性が優れていることを見出したが、
実プレスに近い厳しい絞り加工を行うと、フレーキング
性の点でまだ完全でないことがわかった。実プレスでは
同一金型で連続プレスするので金型温度が上昇する。そ
こで実プレスをシュミレートした試験機を用いて、６０
〜７０’Ｃの温度で引抜き絞り加工でフレーキング試験
したところ、上記のめっき組成でもまれにフレーキング
が発生ずることを見出した。As mentioned above, an alloyed hot-dip Zri-plated steel sheet with an average Fe content of 7 to 11 wt%, a ζ phase of 10 to 60 wt%, and the remainder δ1 phase as a phase, has both powdering and flaking properties. found that it is superior, but
When subjected to a severe drawing process similar to that of an actual press, it was found that the flaking property was still not perfect. In actual pressing, the same mold is used for continuous pressing, so the mold temperature rises. Therefore, using a test machine that simulates an actual press, we
When a flaking test was conducted by drawing and drawing at a temperature of ~70'C, it was found that flaking occasionally occurred even with the above plating composition.
そこで、このめっき層の合金化溶融Ｚｎめっき鋼板をさ
らに表面処理することによってフレーキング性を一層改
善できないか検討した結果、第１に、上述の合金化溶融
めっき鋼板の表面粗度をＲ［≦８−に調整すれば、実プ
レスに近いこの絞り加工においてもフレーキングが発生
しないことを新たに見出した。このような表面粗度を得
るためには、圧下率１％以」二の調質圧延を施すのがよ
い。圧下率１％以下では、一般に行われている調質圧延
と同程度のＲｍ９〜１２μｍとなり、フレーキングを完
全に防止することはできない。Therefore, as a result of considering whether it is possible to further improve the flaking property by further surface treating the alloyed hot-dip coated steel sheet of this coating layer, we found that, first, the surface roughness of the above-mentioned alloyed hot-dip coated steel sheet is R [≦ It was newly discovered that if adjusted to 8-, flaking does not occur even in this drawing process, which is close to actual pressing. In order to obtain such surface roughness, it is preferable to perform skin pass rolling at a reduction rate of 1% or less. If the rolling reduction is 1% or less, the Rm will be 9 to 12 μm, which is about the same as that of the commonly used temper rolling, and flaking cannot be completely prevented.
更に、第２の発明は、前述の層表面に更にＰ、Ｎｉ、
Ｚｎのうちの１種を２０ｗｔ％以下含有したＦｅ系めっ
きを施した合金化熔融Ｚｎめっき鋼板であり、この電気
Ｆｅ系めっきすることにより、プレス成形時にめっき層
の金型への凝着を抑制し、結果的にフレーキング性及び
パウダリング性を改善することができる。Furthermore, in the second invention, P, Ni,
This is an alloyed hot-dip Zn-plated steel sheet that has been subjected to Fe-based plating containing 20 wt% or less of one type of Zn, and this electrolytic Fe-based plating suppresses adhesion of the plating layer to the mold during press forming. As a result, flaking properties and powdering properties can be improved.
電気Ｆｅ系めっき層中の各Ｐ、 Ｎｉ、 Ｚｎの割合を
２０ｗｔ％以下としたのは、これを超えるとめっきが軟
質となって、プレス成形性、特にフレーキング性が低下
するからである。また、Ｆｅ系めっきの付着量は特に規
制しないが、Ｆｅ系めっきそのものの密着性の点から上
限は１０ｇ／ｎｆ以下が望ましい。この電気Ｆｅ−Ｐめ
っきは、硫酸浴、塩化物浴のいずれを使用してもよい。The reason why the proportions of each of P, Ni, and Zn in the electrolytic Fe-based plating layer is set to 20 wt% or less is that if it exceeds this, the plating becomes soft and press formability, especially flaking property, decreases. Furthermore, the amount of Fe-based plating deposited is not particularly regulated, but from the viewpoint of the adhesion of the Fe-based plating itself, the upper limit is preferably 10 g/nf or less. This electric Fe-P plating may be performed using either a sulfuric acid bath or a chloride bath.
平均Ｆｅ含打率が７〜１１ｗｔ％で、ζ相の割合１０〜
６０−Ｌ％、残部δ１相と「相からなり素地鉄界面に形
成する「相が０．４μｍ以下のめっき層を有する合金化
熔融Ｚｎめっき鋼板を得る製造条件は、一般的に浴中へ
！濃度０．ｌＯ〜０．１５ｗｔ％、浸入板温４３０〜５
５０°Ｃ８浴温４５０〜４９０°Ｃでめっきし、４６０
〜５１０°Ｃの中温合金化温度域で合金化処理すること
で得られる。The average Fe content is 7 to 11 wt%, and the proportion of ζ phase is 10 to 10.
The manufacturing conditions for obtaining an alloyed hot-dip Zn-plated steel sheet having a coating layer of 0.4 μm or less consisting of 60-L%, the remainder δ1 phase, and a phase formed at the interface of the base iron are generally as follows: Concentration 0.1O~0.15wt%, penetration plate temperature 430~5
Plating at 50°C8 bath temperature 450-490°C, 460°C
It is obtained by alloying in a medium temperature alloying temperature range of ~510°C.
〈実施例〉
極低炭素鋼（極低Ｃ−Ｔｉ−Ｎｂ系）を素材に、連！？
８融Ｚｎめっきラインでめっきし、合金化処理した。<Example> Using ultra-low carbon steel (ultra-low C-Ti-Nb system) as a material! ?
It was plated on an 8-dip Zn plating line and alloyed.
合金化処理後の目付量、Ｆｅｗｔ％、合金層構造、ζ相
の割合、及び調質圧延の有無、上ＪＩＦ［！−Ｚｎ、Ｆ
ｅ−Ｎｉ、 Ｆｅ −Ｐめっきの目付量、及びＦｅと各
元素の添加割合等を比較例と共に第１表に示した。The basis weight after alloying treatment, Fewt%, alloy layer structure, ratio of ζ phase, presence or absence of skin pass rolling, upper JIF [! -Zn,F
Table 1 shows the basis weight of e-Ni and Fe-P plating, the addition ratio of Fe and each element, etc. together with comparative examples.
なお、めっき層に関し、目付量は、めっき層を二酸化ア
ンヂモン法（Ｊ Ｉ Ｓ Ｈ０４０１）によって熔解
し、重量差から目付量を求めた。合金量（ζ相のめっき
層に占める割合）の測定は、めっき層を２００ ｇ ／
ｌ２ＮａＣ！−Ｆｌｏｏ ｇ ／ ｌ Ｚｎ５Ｏａ
・ ７１１ｚＯ水？容ン夜中で定電流アノード溶解（
２０ｍ八／へ艷）に、電位時間曲線を求め、この電位変
化からη、ζ、δ０、「各層を定量し、全めっき量に対
するζ相の割合を求めた。ｉｉｔ気Ｆｅ系めっきは、通
常の硫酸浴、塩化物浴を用いて、浴中のＦｅとＰ、 Ｎ
ｉ、 Ｚｎ各イオン濃度と電流密度を変えてＰ、 Ｎｉ
、 Ｚｎ含有率とめっき付着量を調整した。Regarding the plating layer, the basis weight was determined by melting the plating layer by the andimon dioxide method (JIS H0401) and calculating the basis weight from the difference in weight. The amount of alloy (ratio of ζ phase in the plating layer) was measured by measuring the plating layer at 200 g/
l2NaC! -Floo g/l Zn5Oa
・711zO water? Constant current anodic dissolution in the middle of the night (
A potential-time curve was obtained for 20m/height), and from this potential change, η, ζ, δ0, and each layer were quantified and the ratio of ζ phase to the total plating amount was determined. Using a sulfuric acid bath and a chloride bath, Fe, P, and N
i, Zn, P, Ni by changing each ion concentration and current density.
, Zn content and coating amount were adjusted.
耐パウダリング性は、合金化溶融Ｚｎめっき鋼板の圧縮
曲げ側にセロテープを貼り、９０°曲げ戻しテスト後、
セロテープはくすし、テープに付着したはくり■をＦｅ
ｗ Ｌ％で測定した。次の５段階に分けて８ｆ価した。Powdering resistance was determined by pasting cellophane tape on the compression bending side of an alloyed hot-dip Zn-plated steel plate, and after a 90° bend back test.
Clean the cellophane tape and remove any peelings that stick to the tape.
Measured in wL%. The 8f value was divided into the following five stages.
◎ ○ Δ ×
良 不良
耐フレーキング性は１０ （Ｗ） Ｘ ｔｏｏ （Ｌ
） ｍＩｍのサンプルを第１閲に示ずビードをもつビー
ド型引抜き試験機で、押え荷重５０〜１００ｋｇ４、引
抜き速度５００ｍｍ／ｍｍで引っ張りテスト後、摺動部
をセロテープはくすし、テープに付着したはくり粉から
フレーキングを目視判定した（試験は無塗油で実施）。◎ ○ Δ × Good Defective flaking resistance is 10 (W)
) The mIm sample was subjected to a tensile test using a bead-type pull-out tester with a bead at a presser load of 50 to 100 kg4 and a pull-out speed of 500 mm/mm. Flaking was determined visually from the flaking powder (the test was conducted without oil).
フレー；トング性の評価は、次の５段階法によった。Flare: Evaluation of tongability was based on the following five-step method.
◎ Ｏ△ × 良 不良 なお第１図において、１はダイス、２はサンプル、 ３はポンチである。◎ O△ × Good Bad In Figure 1, 1 is a die, 2 is a sample, 3 is punch.
〈発明の効果〉
自動車用表面処理鋼板として塗装後耐食性及び溶接性等
が優れている合金化熔融Ｚｎめっき鋼板の使用が増大し
ており、この合金化溶融Ｚｎめっき鋼板は、実プレスに
おいてパウダリング及びフレーキングを起こしやすく、
プリントスルーの発生原因となる。<Effects of the Invention> The use of alloyed hot-dip Zn-plated steel sheets, which have excellent corrosion resistance and weldability after painting, as surface-treated steel sheets for automobiles is increasing, and this alloyed hot-dip Zn-plated steel sheets cannot be powdered in actual presses. and prone to flaking,
This may cause print-through.
本発明により、上記の耐パウダリング性及び耐フレーキ
ング性の優れた合金化熔融Ｚｎめっき鋼板が１）られ、
自動車用表面処理鋼板として益々需要拡大が期待できる
。According to the present invention, the above-mentioned alloyed melt-dipped Zn-plated steel sheet with excellent powdering resistance and flaking resistance is obtained (1),
Demand for surface-treated steel sheets for automobiles is expected to increase.
第１図は耐フレーキング性のビード型引抜き試験機の説
明図である。
■・・・ダイス、
２・・・サンプル、
３・・・ポンチ。FIG. 1 is an explanatory diagram of a bead-type pull-out tester for flaking resistance. ■...Dice, 2...Sample, 3...Punch.
Claims (2)
り、ζ相１０〜６０ｗｔ％、残部がδ＿１相とΓ相から
なり、素地鉄界面に形成されるΓ相が０．４μｍ以下の
Ｚｎ−Ｆｅ合金めっき層を有し、かつ当該めっき層の表
面粗度をＲｍｍ≦８μｍとしたことを特徴とするプレス
成形性に優れた合金化溶融Ｚｎめっき鋼板。(1) The average Fe content on the steel plate surface is 7 to 11 wt%, the ζ phase is 10 to 60 wt%, and the remainder is δ_1 phase and Γ phase, and the Γ phase formed at the interface with the base iron is 0.4 μm or less. An alloyed hot-dip Zn-plated steel sheet with excellent press formability, which has a Zn-Fe alloy plating layer and has a surface roughness of Rmm≦8 μm.
り、ζ相１０〜６０ｗｔ％、残部がδ＿１相とΓ相から
なり、素地鉄界面に形成されるΓ相が０．４μｍ以下の
Ｚｎ−Ｆｅ合金めっき層を有し、その上にＰ、Ｎｉ、Ｚ
ｎのうちの１種を２０％以下含有し、残部Ｆｅからなる
Ｆｅ系めっきを有することを特徴とするプレス成形性に
優れた合金化溶融Ｚｎめっき鋼板。(2) The average Fe content on the iron plate surface is 7 to 11 wt%, the ζ phase is 10 to 60 wt%, and the remainder is δ_1 phase and Γ phase, and the Γ phase formed at the interface with the base iron is 0.4 μm or less. It has a Zn-Fe alloy plating layer, and P, Ni, Z
An alloyed hot-dip Zn-plated steel sheet with excellent press formability, characterized by having an Fe-based plating containing 20% or less of one of n, and the balance consisting of Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32720189A JP2695259B2 (en) | 1989-12-19 | 1989-12-19 | Alloyed hot-dip galvanized steel sheet with excellent press formability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32720189A JP2695259B2 (en) | 1989-12-19 | 1989-12-19 | Alloyed hot-dip galvanized steel sheet with excellent press formability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03191045A true JPH03191045A (en) | 1991-08-21 |
| JP2695259B2 JP2695259B2 (en) | 1997-12-24 |
Family
ID=18196446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32720189A Expired - Fee Related JP2695259B2 (en) | 1989-12-19 | 1989-12-19 | Alloyed hot-dip galvanized steel sheet with excellent press formability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2695259B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012004889A1 (en) | 2010-07-09 | 2012-01-12 | 新日本製鐵株式会社 | Hot-dip zinc-coated steel sheet |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100992225B1 (en) | 2005-12-06 | 2010-11-05 | 가부시키가이샤 고베 세이코쇼 | High-strength galvannealed sheet steels excellent in powdering resistance and process for production of the same |
| KR102484978B1 (en) | 2020-12-11 | 2023-01-05 | 주식회사 포스코 | High strength galvannealed steel sheet having excellent powdering resistance and manufacturing method for the same |
-
1989
- 1989-12-19 JP JP32720189A patent/JP2695259B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012004889A1 (en) | 2010-07-09 | 2012-01-12 | 新日本製鐵株式会社 | Hot-dip zinc-coated steel sheet |
| US8852753B2 (en) | 2010-07-09 | 2014-10-07 | Nippon Steel & Sumitomo Metal Corporation | Galvanized steel sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2695259B2 (en) | 1997-12-24 |
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