JP2002180225A - Plated steel sheet with excellent corrosion resistance and workability - Google Patents
Plated steel sheet with excellent corrosion resistance and workabilityInfo
- Publication number
- JP2002180225A JP2002180225A JP2000379402A JP2000379402A JP2002180225A JP 2002180225 A JP2002180225 A JP 2002180225A JP 2000379402 A JP2000379402 A JP 2000379402A JP 2000379402 A JP2000379402 A JP 2000379402A JP 2002180225 A JP2002180225 A JP 2002180225A
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- Prior art keywords
- corrosion resistance
- steel sheet
- workability
- mass
- plating layer
- Prior art date
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Abstract
(57)【要約】
【課題】 耐食性、加工性に優れためっき鋼板を提供す
る。
【解決手段】 鋼板表面に質量％で、Ａｌ：０．１〜２
０％、Ｍｇ：１〜１５％、Ｓｉ：０．１〜５％、Ｓｎ：
０．３〜２０％を含有し、かつ、ＳｉとＳｎが「０．５
≦Ｓｉ（％）＋Ｓｎ（％）≦２０」を満たし、Ｃａ，Ｂ
ｅ，Ｇａの１種あるいは２種以上の総和が０．１％以上
５％以下で残部がＺｎおよび不可避不純物からなる溶融
めっきが１ｍ2 当たり片面で１０グラム以上８０グラム
以下被覆されたことを特徴とする耐食性、加工性に優れ
ためっき鋼板。
【効果】 耐食性、加工性に優れる主として自動車用途
に使用される溶融めっき鋼板を提供することができる。(57) [Problem] To provide a plated steel sheet excellent in corrosion resistance and workability. SOLUTION: Al: 0.1 to 2% by mass% on the surface of a steel sheet.
0%, Mg: 1 to 15%, Si: 0.1 to 5%, Sn:
0.3-20%, and Si and Sn are "0.5
≦ Si (%) + Sn (%) ≦ 20 ”, Ca, B
e, characterized in that the balance of Zn and unavoidable impurities hot-dipping was coated to 80 grams 10 grams or more per side 1 m 2 with one or two or more of the sum of Ga is less than 5% 0.1% Coated steel sheet with excellent corrosion resistance and workability. [Effect] It is possible to provide a hot-dip coated steel sheet which is excellent in corrosion resistance and workability and is mainly used for automotive applications.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、耐食性、加工性に
優れる主として自動車用途に使用される溶融めっき鋼板
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip coated steel sheet having excellent corrosion resistance and workability and mainly used for automobiles.
【０００２】[0002]
【従来の技術】鋼板に亜鉛めっき後に加熱合金化するい
わゆる合金化溶融亜鉛めっき鋼板は、その優れた塗装性
および溶接性のために主として自動車、家電製品などの
用途に広範に使用されその生産量は非常に大きなものと
なっている。このような鋼板に求められる特性として
は、耐食性、加工性、溶接性、塗装性などがあり、その
うち耐食性は非常に重要である。自動車の車体防錆基準
として、表面錆は５年、穴開きは１０年発生しないとい
う基準が一般的に認識されているが、最近の環境問題な
どから自動車の更なる長寿命化が求められつつあり、車
体防錆もより高い性能のものが期待されている。耐食性
向上という要求から、めっき層の厚さを厚くすることが
考えられるが、めっき層の厚さを厚くすることはめっき
鋼板のプレス成形時の「パウダリング」、「かじり」や
「フレーキング」などの欠陥を発生させる原因となる。
そのような状況の中、近年、マグネシウムが亜鉛の防錆
能を向上させる働きがあるのに注目して、マグネシウム
を用いた亜鉛−マグネシウム合金めっきの開発が盛んに
行われている。2. Description of the Related Art A so-called alloyed hot-dip galvanized steel sheet, which is hot-alloyed after galvanizing a steel sheet, is widely used mainly in applications such as automobiles and home appliances due to its excellent paintability and weldability. Has become very large. Characteristics required for such a steel sheet include corrosion resistance, workability, weldability, paintability, and the like, of which corrosion resistance is very important. As standards for preventing rust on automobile bodies, it is generally recognized that rust does not occur on the surface for 5 years and holes do not occur for 10 years. There is also a need for higher performance rust prevention in vehicle bodies. In order to improve corrosion resistance, it is conceivable to increase the thickness of the plating layer. However, increasing the thickness of the plating layer can be used to increase the powdering, galling and flaking during press forming of plated steel sheets. And other defects.
In such a situation, in recent years, attention has been paid to the fact that magnesium has a function of improving the rust prevention ability of zinc, and zinc-magnesium alloy plating using magnesium has been actively developed.
【０００３】例えば、特開昭６４−１７８５３号公報に
は、０．５〜４０質量％のＭｇを含有するＺｎ−Ｍｇ合
金めっき層を形成することが開示されている。また、特
開平２−１４１５８号公報にはＺｎ−Ｍｇ合金めっき層
と下地の間にＺｎ，Ｎｉ，Ｃｕ，Ｍｇ，Ａｌ，Ｆｅ，Ｃ
ｏなどの中間層を介在させることによりめっき性の密着
性および加工性が向上することが開示されている。ま
た、例えば特開平１１−２６９６２６号公報などには、
耐食性に優れる溶融めっき鋼板としてＡｌ，Ｍｇを含有
するＺｎめっき鋼板が開示されている。この溶融めっき
鋼板はＡｌとＭｇの含有によって非常に優れた耐食性を
呈することが開示されている。さらに、例えば、特開２
０００−１０４１５４号公報には、Ｍｇ，Ａｌ，Ｓｉを
含有するるＺｎめっき鋼板が開示されている。この溶融
めっき鋼板は、めっき層中にＭｇ2 Ｓｉが混在した金属
組織を有することにより優れた耐食性を有することが開
示されている。For example, Japanese Patent Application Laid-Open No. 64-17853 discloses that a Zn—Mg alloy plating layer containing 0.5 to 40% by mass of Mg is formed. Japanese Patent Application Laid-Open No. 2-14158 discloses that Zn, Ni, Cu, Mg, Al, Fe, C
It is disclosed that the interposition of an intermediate layer such as o improves the plating adhesion and workability. Also, for example, in Japanese Patent Application Laid-Open No. 11-269626,
A Zn-plated steel sheet containing Al and Mg is disclosed as a hot-dip coated steel sheet having excellent corrosion resistance. It is disclosed that this hot-dip coated steel sheet exhibits extremely excellent corrosion resistance due to the inclusion of Al and Mg. In addition, for example,
000-104154 discloses a Zn-plated steel sheet containing Mg, Al, and Si. It is disclosed that this hot-dip coated steel sheet has excellent corrosion resistance by having a metal structure in which Mg 2 Si is mixed in a plating layer.
【０００４】[0004]
【発明が解決しようとする課題】これらＭｇを添加した
鋼板は優れた耐食性を有するが、鋼板とＭｇを含むめっ
き層の間に存在する合金層や硬いＭｇ2 Ｓｉの存在によ
り自動車のような厳しい加工を行う場合、「パウダリン
グ」、「かじり」や「フレーキング」などの欠陥が発生
するのが現状である。本発明はこのような状況にかんが
みなされたものであって、自動車用途にも用いることが
できるような耐食性、加工性のいずれにも優れた溶融め
っき鋼板を提供することを課題としてなされたものであ
る。The steel sheet containing Mg has excellent corrosion resistance. However, the steel sheet containing the Mg and the Mg-containing plating layer is hard due to the presence of an alloy layer and hard Mg 2 Si. At the time of processing, defects such as "powdering", "galling" and "flaking" occur at present. The present invention has been made in view of such a situation, and has been made with the object of providing a hot-dip coated steel sheet excellent in both corrosion resistance and workability that can be used for automobiles. is there.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、上記目的
を達成するために検討を重ねた結果、亜鉛系めっき層中
にＳｎを添加させることで耐食性が向上すると共に、め
っき層中に硬質な物質を作らないことを見出したという
新知見に基づき、鋼板の表面にめっき層厚さを限定した
Ｚｎ−Ａｌ−Ｍｇ−Ｓｎ合金めっきを形成することによ
って、優れた耐食性、加工性が得られることを見出して
本発明をなした。また、めっき層中にＳｉを含有させた
Ｚｎ−Ａｌ−Ｍｇ−Ｓｎ−Ｓｉ合金めっきを形成するこ
とで耐食性がさらに向上することを見出して本発明をな
した。さらに、鋼板の表面にＺｎ−Ａｌ−Ｍｇ−Ｓｉ−
Ｓｎ合金めっきを形成する際に、該めっき層の凝固組織
中にＭｇ2 Ｓｎ、Ｍｇ2 Ｓｉを混在させることによって
さらに優れた耐食性、加工性を得られることを見出して
本発明をなした。Means for Solving the Problems As a result of repeated studies to achieve the above object, the present inventors have found that the addition of Sn to a zinc-based plating layer improves the corrosion resistance and improves the corrosion resistance of the plating layer. Based on the new finding that hard materials are not formed, excellent corrosion resistance and workability are obtained by forming Zn-Al-Mg-Sn alloy plating with a limited plating layer thickness on the surface of the steel sheet. SUMMARY OF THE INVENTION Further, the present inventors have found that the formation of Zn-Al-Mg-Sn-Si alloy plating containing Si in the plating layer further improves the corrosion resistance, and made the present invention. Furthermore, Zn-Al-Mg-Si-
The present invention has been made by finding that even better corrosion resistance and workability can be obtained by mixing Mg 2 Sn and Mg 2 Si in the solidification structure of the plating layer when forming the Sn alloy plating.
【０００６】すなわち、本発明の要旨とするところは以
下の通り、 （１）鋼板表面に質量％で、Ａｌ：０．１〜２０％、Ｍ
ｇ：１〜１５％、Ｓｉ：０．１〜５％、Ｓｎ：０．３〜
２０％を含有し、かつ、ＳｉとＳｎが式０．５≦Ｓｉ
（％）＋Ｓｎ（％）≦２０を満たし、残部がＺｎおよび
不可避不純物からなる溶融めっきが１ｍ2 当たり片面で
１０グラム以上８０グラム以下被覆されたことを特徴と
する耐食性、加工性に優れためっき鋼板。Specifically, the gist of the present invention is as follows: (1) Al: 0.1 to 20% by mass%
g: 1 to 15%, Si: 0.1 to 5%, Sn: 0.3 to
20% and Si and Sn satisfy the formula 0.5 ≦ Si
(%) + Sn (%) ≦ 20, with hot-dip plating comprising Zn and unavoidable impurities being coated on one side in an amount of 10 g or more and 80 g or less per m 2 , which is excellent in corrosion resistance and workability. steel sheet.
【０００７】（２）鋼板表面に質量％で、Ａｌ：０．１
〜２０％、Ｍｇ：１〜１５％、Ｓｉ：０．１〜５％、Ｓ
ｎ：０．３〜２０％を含有し、かつ、ＳｉとＳｎが式
０．５≦Ｓｉ（％）＋Ｓｎ（％）≦２０を満たし、かつ
Ｃａ，Ｂｅ，Ｇａの１種あるいは２種以上の総和が質量
％で０．１％以上５％以下で、残部がＺｎおよび不可避
不純物からなる溶融めっきが１ｍ2 当たり片面で１０グ
ラム以上８０グラム以下被覆されたことを特徴とする耐
食性、加工性に優れためっき鋼板。(2) Al: 0.1% by mass on the steel sheet surface
-20%, Mg: 1-15%, Si: 0.1-5%, S
n: 0.3 to 20%, and Si and Sn satisfy the formula: 0.5 ≦ Si (%) + Sn (%) ≦ 20, and one or more of Ca, Be, and Ga total of 5% or less than 0.1% by mass%, the corrosion resistance and the balance of the molten plating composed of Zn and unavoidable impurities was coated to 80 grams 10 grams or more per side 1 m 2, workability Excellent plated steel sheet.
【０００８】（３）前記（１）、（２）の鋼板のめっき
成分に、さらに、質量％で、Ｆｅ：１５％以下を含むこ
とを特徴とする耐食性、加工性に優れためっき鋼板。 （４）前記（１）、（２）（３）の鋼板のめっき層に、
Ｍｇ2 Ｓｉ、Ｍｇ2 Ｓｎの一方あるいは双方の総和がめ
っき層中の体積％で０．５％以上１０％以下であること
を特徴とする耐食性、加工性に優れためっき鋼板にあ
る。(3) A plated steel sheet excellent in corrosion resistance and workability, characterized in that the plating component of the steel sheets of (1) and (2) further contains Fe: 15% or less by mass%. (4) In the plating layer of the steel sheet of (1), (2) or (3),
A plated steel sheet excellent in corrosion resistance and workability, characterized in that one or both of Mg 2 Si and Mg 2 Sn is 0.5% or more and 10% or less by volume in the plating layer.
【０００９】[0009]
【発明の実施の形態】以下に、本発明を詳細に説明す
る。本発明において、めっき鋼板とは鋼板上にＺｎ−Ａ
ｌ−Ｍｇ−Ｓｎのめっき層を付与したものである。本発
明の下地鋼板としては、Ａｌキルド鋼、Ｔｉ，Ｎｂなど
を添加した極低炭素鋼、および、Ｓｉ，Ｍｎを含有した
高強度鋼板など種々のものが適用できる。さらに、めっ
き鋼板上に化成処理を施したものを含む。Ｚｎ−Ａｌ−
Ｍｇ−Ｓｉ−Ｓｎめっき層は鋼板表面に質量％でＡｌ：
０．１〜２０％、Ｍｇ：１〜１５％、Ｓｉ：０．１〜５
％、Ｓｎ：０．３〜２０％を含有し、かつ、ＳｉとＳｎ
が「１≦Ｓｉ（％）＋Ｓｎ（％）≦２０」を満たし、残
部がＺｎおよび不可避不純物からなる溶融めっきが１ｍ
2 当たり片面で１０グラム以上８０グラム以下被覆され
たＺｎ合金めっき層である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. In the present invention, a plated steel sheet refers to Zn-A
It is provided with a 1-Mg-Sn plating layer. As the base steel sheet of the present invention, various kinds such as an Al-killed steel, an ultra-low carbon steel added with Ti, Nb, and the like, and a high-strength steel sheet containing Si and Mn can be applied. Further, it includes those subjected to a chemical conversion treatment on a plated steel sheet. Zn-Al-
The Mg-Si-Sn plating layer has a mass%
0.1-20%, Mg: 1-15%, Si: 0.1-5
%, Sn: 0.3 to 20%, and Si and Sn
Satisfies “1 ≦ Si (%) + Sn (%) ≦ 20”, and the balance is 1 m of hot-dip plating composed of Zn and unavoidable impurities.
2 is a Zn alloy plating layer coated on one side from 10 g to 80 g.
【００１０】以下に、これらの限定理由について示す。
Ａｌは耐食性向上のために含有させる。Ａｌの含有量を
０．１〜２０質量％に限定した理由は、０．１質量％未
満ではＭｇの酸化物が顕著に生成し、ドロスの発生なら
びにめっき表面の性状が悪化し操業に支障をきたすため
である。２０質量％超では溶融めっきの温度が高くなり
操業コストが上がるためである。ＭｇはＳｉと金属間化
合物をめっき層中に形成し、この金属間化合物が耐食性
に寄与する。Ｍｇの含有量を１〜１５質量％に限定した
理由は、１質量％未満では耐食性を向上させる効果が不
十分であるためであり、１５質量％超ではめっき層が脆
くなって加工性が低下するためである。The reasons for these limitations will be described below.
Al is contained for improving corrosion resistance. The reason for limiting the Al content to 0.1 to 20% by mass is that if it is less than 0.1% by mass, oxides of Mg are remarkably formed, dross is generated, and the properties of the plating surface are deteriorated, which hinders the operation. This is to help. If the content exceeds 20% by mass, the temperature of the hot-dip plating increases, and the operating cost increases. Mg forms an intermetallic compound with Si in the plating layer, and this intermetallic compound contributes to corrosion resistance. The reason why the content of Mg is limited to 1 to 15% by mass is that if the content is less than 1% by mass, the effect of improving the corrosion resistance is insufficient. To do that.
【００１１】ＳｉはＭｇと金属間化合物をめっき層中に
形成し、この金属間化合物が耐食性に寄与する。Ｓｉの
含有量を０．１〜５質量％に限定した理由は、０．１質
量％未満ではめっき層中のＡｌと鋼板中のＦｅが反応し
めっき層が脆くなって成形性が劣化するためであり、５
質量％を超えると溶融めっきの温度が高くなり操業上問
題が生じると同時に、めっき中に硬質なＳｉ化合物が形
成される結果、成形性が劣化するためである。耐食性の
向上効果を発揮させるためにはＳｉを０．３質量％以
上、良好な成形性を得るためには、Ｓｉを３質量％未満
にすることが望ましい。ＳｎはＳｉ，と同様Ｍｇと金属
間化合物をめっき層中に形成し、この金属間化合物が耐
食性に寄与する。Si forms Mg and an intermetallic compound in a plating layer, and this intermetallic compound contributes to corrosion resistance. The reason why the content of Si is limited to 0.1 to 5% by mass is that if the content is less than 0.1% by mass, Al in the plating layer and Fe in the steel plate react to make the plating layer brittle and deteriorate the formability. And 5
If the content is more than 10% by mass, the temperature of the hot-dip plating becomes high, causing a problem in operation, and at the same time, a hard Si compound is formed during the plating, resulting in deterioration in formability. In order to exhibit the effect of improving corrosion resistance, it is desirable to make Si 0.3% by mass or more, and to obtain good moldability, it is desirable to make Si less than 3% by mass. Sn forms Mg and an intermetallic compound in the plating layer like Si, and this intermetallic compound contributes to corrosion resistance.
【００１２】本発明で最も重要な成分であり、亜鉛系の
めっき合金中にＳｎを含有させることにより優れた耐食
性と成形性を両立させている。その理由はＭｇ2 Ｓｎは
Ｍｇ 2 Ｓｉのようには硬くないので、Ｓｉと異なりめっ
き層中に硬質な合金層を形成するからであると推定して
いる。Ｓｎ含有量を０．３〜２０質量％に限定した理由
は、０．３％未満では耐食性の向上効果が小さいためで
あり、２０質量％超では耐食性の向上効果が飽和するた
めである。良好な耐食性を得るためにはＳｎを０．６質
量％以上にすることが望ましい。また、ＳｉとＳｎをあ
わせて「０．５≦Ｓｉ（％）＋Ｓｎ（％）≦２０」にし
なければならない。Ｓｉ（％）＋Ｓｎ（％）が０．５％
未満では耐食性の向上効果が小さい。Ｓｉ（％）＋Ｓｎ
（％）が２０％を超えると耐食性の向上効果が飽和する
と同時に成形性が劣化するためである。良好な耐食性を
確保するためにはＳｉ（％）＋Ｓｎ（％）が１％以上に
することが望ましい。The most important component of the present invention is a zinc-based component.
Excellent corrosion resistance by including Sn in plating alloy
And moldability. The reason is MgTwoSn is
Mg TwoIt is not as hard as Si, so unlike Si
Presumably because it forms a hard alloy layer in the
I have. Reason for limiting the Sn content to 0.3 to 20% by mass
Is less than 0.3% because the effect of improving corrosion resistance is small.
If more than 20% by mass, the effect of improving corrosion resistance is saturated.
It is. 0.6 quality Sn to obtain good corrosion resistance
It is desirable that the amount be not less than%. In addition, Si and Sn
Therefore, "0.5 ≦ Si (%) + Sn (%) ≦ 20”
There must be. 0.5% of Si (%) + Sn (%)
If less, the effect of improving corrosion resistance is small. Si (%) + Sn
If (%) exceeds 20%, the effect of improving corrosion resistance is saturated.
At the same time, the moldability deteriorates. Good corrosion resistance
In order to secure, Si (%) + Sn (%) should be 1% or more
It is desirable to do.
【００１３】本発明のめっき層は以上を基本成分とする
が、これらの元素およびＺｎ以外にＣａ，Ｂｅ，Ｇａの
１種または２種以上の総和が０．１質量％以上５質量％
以下含んでもよい。これら元素はめっき鋼板表面の外観
を悪化させる酸化物の成長を抑えることができる。０．
１質量％未満では上記効果が得られない。一方、５質量
％を超えるとめっき層が脆くなり加工性が劣化する。め
っき層中にはさらに、Ｓｂ，Ｐｂ，Ｍｎ，Ｚｒなどを単
独あるいは複合で１質量％以内含有してもよい。さら
に、Ｆｅを１５質量％以下含んでもよい。Ｆｅをめっき
層中に含有させることでめっき層の融点、硬度が高くな
ることから溶接性が向上する。また、Ｆｅを含有させる
ことでめっき層の電位が母材に近づくので塗装後耐食性
も向上する。ただ、Ｆｅ含有量を増やしすぎると加工性
が劣化するので、１５％を上限とする必要がある。The plating layer of the present invention has the above basic components, and in addition to these elements and Zn, the total of one or more of Ca, Be, and Ga is 0.1% by mass to 5% by mass.
The following may be included. These elements can suppress the growth of oxides that deteriorate the appearance of the surface of the plated steel sheet. 0.
If it is less than 1% by mass, the above effect cannot be obtained. On the other hand, if it exceeds 5% by mass, the plating layer becomes brittle and the workability deteriorates. The plating layer may further contain Sb, Pb, Mn, Zr, etc., alone or in combination, within 1% by mass. Further, Fe may be contained in an amount of 15% by mass or less. The inclusion of Fe in the plating layer increases the melting point and hardness of the plating layer, thereby improving the weldability. Further, by containing Fe, the potential of the plating layer approaches the base material, so that the corrosion resistance after painting is improved. However, if the Fe content is excessively increased, the workability is degraded, so the upper limit must be 15%.
【００１４】本発明において、めっきの付着量も重要で
ある。耐食性の観点から、１ｍ2 当たり片面で１０グラ
ム以上必要である。また、めっきの付着量を多くすると
加工性が劣化するので８０グラム以下にしなければなら
ない。本発明において、さらに耐食性、加工性に優れた
めっき鋼板を得るためには、めっき層中にＭｇ2 Ｓｉ、
Ｍｇ2 Ｓｎの一方あるいは双方の総和がめっき層中の体
積％で０．５％以上１０％以下であることが望ましい。
これら、Ｍｇ2 Ｓｉ、Ｍｇ2 Ｓｎ相はめっき層の凝固組
織中に明確な境界を持って島状に見える相であり、光学
顕微鏡観察によって明確に区別できるものである。In the present invention, the amount of plating is also important. From the viewpoint of corrosion resistance, it is necessary 10 grams or more per side 1 m 2. Further, if the amount of plating is increased, the workability is deteriorated. In the present invention, in order to further obtain a plated steel sheet having excellent corrosion resistance and workability, Mg 2 Si,
It is desirable that the sum of one or both of Mg 2 Sn is 0.5% or more and 10% or less by volume% in the plating layer.
These Mg 2 Si and Mg 2 Sn phases are phases that look like islands with a clear boundary in the solidification structure of the plating layer, and can be clearly distinguished by optical microscope observation.
【００１５】Ｍｇ2 Ｓｉ相は耐食性向上に明確に寄与す
る。これはＭｇ2 Ｓｉが非常に活性であるために犠牲防
食効果を発揮するためと考えられる。一方、Ｍｇ2 Ｓｎ
相は非常に活性であるために犠牲防食効果を発揮すると
同時に、硬質な化合物ではないので耐食性向上だけでな
く加工性を劣化しない効果を有する。これらＭｇ2 Ｓ
ｉ、Ｍｇ2 Ｓｎの一方あるいは双方の総和が０．５％以
上で明確に観察される。良好な耐食性を得るためには１
％以上が望ましい。一方、Ｍｇ2 Ｓｉ、Ｍｇ2 Ｓｎの一
方あるいは双方の総和が１０％を超えると成形性が劣化
するので１０％以下である必要がある。成形性確保の観
点ではＭｇ2 Ｓｉは硬質な化合物であるのでＭｇ2 Ｓｉ
の量を５％未満にした方が望ましい。The Mg 2 Si phase clearly contributes to the improvement of corrosion resistance. This is considered to be because Mg 2 Si is very active and exhibits a sacrificial anticorrosion effect. On the other hand, Mg 2 Sn
Since the phase is very active, it exhibits a sacrificial anticorrosion effect, and at the same time has the effect of not only improving corrosion resistance but also not deteriorating workability since it is not a hard compound. These Mg 2 S
It is clearly observed that the sum of one or both of i and Mg 2 Sn is 0.5% or more. To obtain good corrosion resistance, 1
% Or more is desirable. On the other hand, if the sum total of one or both of Mg 2 Si and Mg 2 Sn exceeds 10%, the formability deteriorates, so that it is necessary to be 10% or less. Since Mg 2 Si is a hard compound from the viewpoint of ensuring formability, Mg 2 Si
Is desirably less than 5%.
【００１６】[0016]
【実施例】表１に示す種々の冷延鋼板を母材とし、実機
の溶融亜鉛めっき設備を用いて溶融めっきを行った。溶
融めっき時の焼鈍温度は８００℃と一定とし、浴温度は
４００〜６００℃とし、浴中の重量比を変化させた浴で
３秒溶融めっきを行い、窒素ガスワイピングでめっき付
着量を変化させた。さらに、一部についてはその後合金
化炉で５００℃に加熱し、めっき層と母材を反応させた
合金化溶融めっきにした。EXAMPLES Various cold-rolled steel sheets shown in Table 1 were used as base materials, and hot-dip galvanizing was performed using actual hot-dip galvanizing equipment. The annealing temperature at the time of hot-dip plating is fixed at 800 ° C, the bath temperature is 400 to 600 ° C, hot-dip plating is performed for 3 seconds in a bath having a different weight ratio in the bath, and the amount of plating applied is changed by nitrogen gas wiping. Was. Further, a part thereof was heated to 500 ° C. in an alloying furnace to form alloyed hot-dip plating in which the plating layer and the base material were reacted.
【００１７】[0017]
【表１】 [Table 1]
【００１８】以上のようにして作製しためっき鋼板につ
いて、下記に示す「加工性評価」、「耐食性評価」を行
った。「加工性評価」は１５０×７０ｍｍに切断したも
のについて、１８０度折り曲げ試験を行い、以下の基準
に従い評価した。 テープテスト黒化度（％） 評価：◎ … ０〜１０ 評価：○ … １０〜２０未満 評価：△ … ２０〜３０未満 評価：× … ３０以上 （◎と○が合格、△・×は不合格）The plated steel sheet produced as described above was subjected to the following “workability evaluation” and “corrosion resistance evaluation”. "Evaluation of workability" was evaluated by a 180-degree bending test on a sample cut to 150 x 70 mm according to the following criteria. Tape test blackness (%) Evaluation:… ０〜 0 to 10 Evaluation: 未 満 Less than 10 to 20 Evaluation: △ 未 満 Less than 20 to 30 Evaluation: × 30 or more (◎ and ○ passed, △ ・ × failed) )
【００１９】「耐食性評価」は１５０×７０ｍｍに切断
したものについて、５％、３５℃の塩水を２０００時間
噴霧した後の赤錆発生率を調べた。耐食性評価基準を以
下に示すが、評点は３以上を合格とした。 評価５：５％未満 評価４：５％以上１０％未満 評価３：１０％以上２０％未満 評価２：２０％以上３０％未満 評価１：３０％以上"Evaluation of corrosion resistance" was evaluated for the occurrence of red rust after spraying 5%, 35 ° C. salt water for 2,000 hours on a piece cut to 150 × 70 mm. The evaluation criteria for corrosion resistance are shown below, and a score of 3 or more was regarded as a pass. Evaluation 5: less than 5% Evaluation 4: 5% to less than 10% Evaluation 3: 10% to less than 20% Evaluation 2: 20% to less than 30% Evaluation 1: 30% or more
【００２０】また、「溶接試験」は、溶接電流：１０ｋ
Ａ、加圧力：２２０ｋｇ、溶接時間：１２サイクル、電
極径：６ｍｍ、電極形状：ドーム型，先端６φ−４０Ｒ
の溶接条件でスポット溶接を行い、ナゲット径が４√ｔ
（ｔ：板厚）を切った時点までの連続打点数を評価し
た。評価基準は◎：連続打点２０００点超、○：連続打
点１０００〜２０００点、△：連続打点５００〜１００
０点、×：連続打点５００点未満とした。ここでは、
◎、○を合格とし、△・×は不合格とした。さらに、Ｍ
ｇ2 Ｓｉ、Ｍｇ2 Ｓｎの量は、それぞれ断面のＳＥＭ、
ＥＰＭＡ分析から、めっき層中に島状に観察されＭｇと
ＳｉあるいはＳｎが重なっている領域を測定し、断面の
面積率で算出した。製造条件と評価試験結果を表２、表
３に示すが、本発明材はいずれも耐食性、加工性に優
れ、溶接性も特に問題はない。The "welding test" was conducted with a welding current of 10 k.
A, pressure: 220 kg, welding time: 12 cycles, electrode diameter: 6 mm, electrode shape: dome, tip 6φ-40R
Spot welding is performed under the following welding conditions and the nugget diameter is 4√t
The number of continuous hitting points up to the point where (t: plate thickness) was cut was evaluated. The evaluation criteria are ：: more than 2000 continuous hit points, ○: 1000 to 2000 continuous hit points, Δ: 500 to 100 continuous hit points.
0 points, ×: Continuous hit points were less than 500 points. here,
◎, ○ were accepted, and △, × were failed. Further, M
The amounts of g 2 Si and Mg 2 Sn were determined by SEM,
From the EPMA analysis, a region where Mg and Si or Sn were observed in the form of an island in the plating layer was measured, and the area ratio of the cross section was calculated. The production conditions and evaluation test results are shown in Tables 2 and 3. The materials of the present invention are all excellent in corrosion resistance and workability, and there is no particular problem in weldability.
【００２１】[0021]
【表２】 [Table 2]
【００２２】[0022]
【表３】 [Table 3]
【００２３】[0023]
【発明の効果】以上説明したように、本発明によれば、
耐食性、加工性に優れる主として自動車用途に使用され
る溶融めっき鋼板を市場に安価に提供することができ
る。As described above, according to the present invention,
A hot-dip coated steel sheet excellent in corrosion resistance and workability and mainly used for automobiles can be provided to the market at low cost.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 瀬沼 武秀 福岡県北九州市戸畑区飛幡町１番１号 新 日本製鐵株式会社八幡製鐵所内 (72)発明者 山口 伸一 福岡県北九州市戸畑区飛幡町１番１号 新 日本製鐵株式会社八幡製鐵所内 (72)発明者 後藤 靖人 福岡県北九州市戸畑区飛幡町１番１号 新 日本製鐵株式会社八幡製鐵所内 Ｆターム(参考） 4K027 AA05 AA22 AB02 AB05 AB28 AB43 AB44 AC52 AC73 AE02 AE03 AE23 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takehide Senuma 1-1, Tobata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation Yawata Works (72) Inventor Shinichi Yamaguchi Tobata-ku, Tobata-ku, Kitakyushu, Fukuoka No. 1-1, New Town Nippon Steel Corporation Yawata Works (72) Inventor Yasuhito Goto 1-1, Hibata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka Prefecture F-term in Nippon Steel Corporation Yawata Works (reference) 4K027 AA05 AA22 AB02 AB05 AB28 AB43 AB44 AC52 AC73 AE02 AE03 AE23
Claims (4)
０％、Ｍｇ：１〜１５％、Ｓｉ：０．１〜５％、Ｓｎ：
０．３〜２０％を含有し、かつ、ＳｉとＳｎが式０．５
≦Ｓｉ（％）＋Ｓｎ（％）≦２０を満たし、残部がＺｎ
および不可避不純物からなる溶融めっきが１ｍ2 当たり
片面で１０グラム以上８０グラム以下被覆されたことを
特徴とする耐食性、加工性に優れためっき鋼板。1. Al: 0.1 to 2% by mass on the steel sheet surface
0%, Mg: 1 to 15%, Si: 0.1 to 5%, Sn:
0.3 to 20%, and Si and Sn are represented by the formula 0.5
≦ Si (%) + Sn (%) ≦ 20, the balance being Zn
And corrosion resistance consisting of unavoidable impurities hot dipping is characterized in that it is coated to 80 grams 10 grams or more per side 1 m 2, plated steel sheet excellent in workability.
０％、Ｍｇ：１〜１５％、Ｓｉ：０．１〜５％、Ｓｎ：
０．３〜２０％を含有し、かつ、ＳｉとＳｎが式０．５
≦Ｓｉ（％）＋Ｓｎ（％）≦２０を満たし、かつＣａ，
Ｂｅ，Ｇａの１種あるいは２種以上の総和が質量％で
０．１％以上５％以下で、残部がＺｎおよび不可避不純
物からなる溶融めっきが１ｍ2 当たり片面で１０グラム
以上８０グラム以下被覆されたことを特徴とする耐食
性、加工性に優れためっき鋼板。2. Al: 0.1 to 2% by mass on a steel sheet surface.
0%, Mg: 1 to 15%, Si: 0.1 to 5%, Sn:
0.3 to 20%, and Si and Sn are represented by the formula 0.5
≦ Si (%) + Sn (%) ≦ 20 and Ca,
Be, 1 kind or two or more of the sum of Ga is 5% or less than 0.1% by mass%, the balance being molten plating composed of Zn and unavoidable impurities is coated to 80 grams 10 grams or more per surface 1 m 2 A plated steel sheet with excellent corrosion resistance and workability.
Ｆｅ：１５％以下を含むことを特徴とする請求項１また
は２記載の耐食性、加工性に優れためっき鋼板。3. The composition according to claim 1, further comprising:
The plated steel sheet having excellent corrosion resistance and workability according to claim 1 or 2, characterized by containing Fe: 15% or less.
方あるいは双方の総和がめっき層中の体積％で０．５％
以上１０％以下であることを特徴とする請求項１〜３記
載の耐食性、加工性に優れためっき鋼板。4. The plating layer has a total content of one or both of Mg 2 Si and Mg 2 Sn of 0.5% by volume in the plating layer.
The plated steel sheet having excellent corrosion resistance and workability according to any one of claims 1 to 3, which is at least 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000379402A JP2002180225A (en) | 2000-12-13 | 2000-12-13 | Plated steel sheet with excellent corrosion resistance and workability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000379402A JP2002180225A (en) | 2000-12-13 | 2000-12-13 | Plated steel sheet with excellent corrosion resistance and workability |
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| Publication Number | Publication Date |
|---|---|
| JP2002180225A true JP2002180225A (en) | 2002-06-26 |
Family
ID=18847782
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000379402A Withdrawn JP2002180225A (en) | 2000-12-13 | 2000-12-13 | Plated steel sheet with excellent corrosion resistance and workability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002180225A (en) |
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| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20080304 |