JP2003253416A - Hot-dip zincing steel sheet - Google Patents
Hot-dip zincing steel sheetInfo
- Publication number
- JP2003253416A JP2003253416A JP2002051503A JP2002051503A JP2003253416A JP 2003253416 A JP2003253416 A JP 2003253416A JP 2002051503 A JP2002051503 A JP 2002051503A JP 2002051503 A JP2002051503 A JP 2002051503A JP 2003253416 A JP2003253416 A JP 2003253416A
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- steel sheet
- phase
- plating layer
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- mass
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- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、合金化溶融亜鉛め
っき鋼板に係わり、特に、パウダリング性及び摺動性に
優れた新規な合金化溶融亜鉛めっき鋼板に関する。TECHNICAL FIELD The present invention relates to an alloyed hot-dip galvanized steel sheet, and more particularly to a novel alloyed hot-dip galvanized steel sheet having excellent powdering properties and slidability.
【０００２】[0002]
【従来の技術】溶融亜鉛めっき鋼板を加熱処理した所謂
「合金化溶融亜鉛めっき鋼板」は、自動車を始め、家
電、建材の材料として広く用いられており、プレス成形
性、溶接性、耐食性、塗装性等の性能に優れていること
が望ましい。特に、プレス成形性としては、パウダリン
グやフレーキングが起きないこと（以下、耐パウダリン
グ性及び耐フレーキング性という）が要求される。ここ
で、パウダリングやフレーキングとは、プレス成形時に
めっき層が剥離する現象であり、この現象は、素地であ
る鋼板（地鉄と称する）とめっき層との界面に、金属組
織としてＦｅ濃度の高い、固くて脆いΓ相が厚く生成さ
れると、発生し易い。パウダリングやフレーキングが発
生すると、鋼板をプレス成形する際に、金型に剥離片が
付着し、それが転写して製品に押し疵等が生じるので、
プレス金型の清掃が余儀なくされ、プレス工程の歩留り
低下を引き起こすという問題があった。2. Description of the Related Art The so-called "alloyed hot dip galvanized steel sheet" obtained by heat-treating hot-dip galvanized steel sheet is widely used as a material for automobiles, home appliances and building materials, and has press formability, weldability, corrosion resistance and coating. It is desirable to have excellent properties such as properties. In particular, the press moldability is required to prevent powdering and flaking (hereinafter referred to as powdering resistance and flaking resistance). Here, powdering or flaking is a phenomenon in which the plating layer peels off during press forming. This phenomenon is caused by the Fe concentration as a metallographic structure at the interface between the base steel plate (called the base iron) and the plating layer. If a thick and hard and brittle Γ phase having a high temperature is generated, it is likely to occur. When powdering or flaking occurs, a peeling piece adheres to the mold when the steel sheet is press-formed, and this is transferred to the product to cause a flaw or the like.
There is a problem that the press die is forced to be cleaned and the yield of the press process is reduced.
【０００３】この問題を解決するため、特公平３−５５
５４４号公報は、めっき浴中の有効Ａｌ量を０．１０質
量％以下、浸漬時間３秒、好ましくは２秒以下とするこ
とで、該めっき浴中で形成されるＦｅ−Ａｌ合金層を薄
くし、かつ健全なままの状態で合金化炉に導く技術を提
案した。その結果、めっき表層にη相やζ相が存在せ
ず、かつ素地鋼板とめっき層との界面でのΓ相厚さを１
μｍ以下にすることができ、耐パウダリング性や耐フレ
ーキング性に優れた合金化溶融亜鉛めっき鋼板を製造す
ることができるようになった。なお、かかるめっき層の
組成は、Ｆｅ：８１２質量％、Ａｌ：０．０５〜０．２
５質量％、残部Ｚｎからなるものであった。To solve this problem, Japanese Patent Publication No. 3-55
No. 544 discloses that the Fe-Al alloy layer formed in the plating bath is made thin by setting the effective Al amount in the plating bath to 0.10 mass% or less and the dipping time to 3 seconds, preferably 2 seconds or less. In addition, we have proposed a technique that leads to an alloying furnace in a sound state. As a result, there is no η phase or ζ phase in the plating surface layer, and the Γ phase thickness at the interface between the base steel sheet and the plating layer is 1
It has become possible to manufacture an alloyed hot-dip galvanized steel sheet having excellent powdering resistance and flaking resistance. The composition of the plating layer is Fe: 812 mass%, Al: 0.05 to 0.2.
It consisted of 5 mass% and the balance Zn.
【０００４】また、特開平１０−２２６８６２号公報
は、パウダリングやフレーキングの発生を抑制し、従来
よりプレス成形性及びめっき皮膜の平滑性に優れた合金
化溶融亜鉛めっき鋼板を提案している。それは、Ｆｅ：
７〜１５重量％、Ａｌ：０．３５〜１．０重量％、残部
Ｚｎ及び不可避不純物からなり、付着量が片面当り１５
〜１００ｇ／ｍ2であると共に、η相を０．１重量％未
満、地鉄／めっき層界面のΓ相厚さが１．０μｍ以下で
あるめっき層を、少なくとも片面に有することを特徴と
するものである。Japanese Unexamined Patent Publication No. 10-226862 proposes an alloyed hot-dip galvanized steel sheet which suppresses the occurrence of powdering and flaking and is more excellent in press formability and the smoothness of the plating film than before. . It is Fe:
7 to 15% by weight, Al: 0.35 to 1.0% by weight, balance Zn and unavoidable impurities.
It is characterized by having a plating layer having a η phase of less than 0.1% by weight and a Γ phase thickness of 1.0 μm or less at the base metal / plating layer interface on at least one side as well as ˜100 g / m 2. It is a thing.
【０００５】また、自動車等の部品へのプレス加工時に
は、金型との摺動性といっためっき表層に関与する特性
も重要である。この特性は、めっき表層のζ相の存在に
より大きく劣化する傾向にある。そのため、良好な摺動
性を確保するには、めっき層表面のζ相が金型に接触す
ることを極力抑制するようにした鋼板であることが望ま
しい。このような考え方から、特開２００１−１３１７
６９号公報は、めっき表面に平坦部を有し、その平坦部
の表層にＡｌ酸化物を２０ｍａｓｓ％以上含有した酸化
物層を有することを特徴とする合金化溶融亜鉛めっき鋼
板を開示している。Further, during press working of parts such as automobiles, the characteristics related to the plating surface layer such as slidability with a die are also important. This characteristic tends to be greatly deteriorated due to the presence of the ζ phase in the plating surface layer. Therefore, in order to ensure good slidability, it is desirable that the steel plate is a steel plate that suppresses the contact of the ζ phase on the surface of the plating layer with the mold as much as possible. From such an idea, JP 2001-1317 A
Japanese Patent Publication No. 69 discloses an alloyed hot-dip galvanized steel sheet having a flat portion on the plating surface and an oxide layer containing Al oxide in an amount of 20 mass% or more on the surface layer of the flat portion. .
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、本発明
者の研究によれば、前記した特公平３−５５５４４号公
報、特開平１０−２２６８６２号公報及び特開２００１
−１３１７６９に開示された合金化溶融亜鉛めっき鋼板
でも、実際の自動車等の部品をより厳しい条件下でプレ
ス加工する際には、耐パウダリングや摺動性についての
問題が残った。つまり、満足できる程度に耐パウダリン
グ性が優れ、且つ摺動性に優れた合金化溶融亜鉛めっき
鋼板を提供できなかったのである。However, according to the research conducted by the present inventor, the above-described Japanese Patent Publication No. 3-55544, Japanese Unexamined Patent Publication No. 10-226862 and Japanese Unexamined Patent Publication No. 2001-2001.
Even with the alloyed hot-dip galvanized steel sheet disclosed in No. 131317, problems such as powdering resistance and slidability remained when press-working actual automobile parts under more severe conditions. In other words, it was not possible to provide a galvannealed steel sheet having a satisfactory powdering resistance and an excellent sliding property.
【０００７】本発明は、かかる事情を鑑み、自動車等の
部品にプレス加工しても、耐パウダリング性、且つ摺動
性に優れた合金化溶融亜鉛めっき鋼板を提供することを
目的としている。In view of such circumstances, it is an object of the present invention to provide an alloyed hot-dip galvanized steel sheet which is excellent in powdering resistance and slidability even when pressed into parts such as automobiles.
【０００８】[0008]
【課題を解決するための手段】発明者は、上記目的を達
成するため、めっき層の組成、地鉄とめっき層との界面
のΓ相量、めっき層表面のη相及びζ相の排除、目付量
を高度にバランスさせることに着目して鋭意研究を行
い、その成果を本発明に具現化した。Means for Solving the Problems In order to achieve the above object, the inventor has made the composition of the plating layer, the amount of Γ phase at the interface between the base metal and the plating layer, the elimination of η phase and ζ phase on the surface of the plating layer, Focused on highly balancing the areal weight, the inventors have conducted earnest research, and realized the results in the present invention.
【０００９】すなわち、本発明は、溶融亜鉛めっき浴へ
鋼板を浸漬し、その表面にめっき層を形成させ、次いで
めっき浴から引き上げた鋼板を加熱して、めっき層を合
金化して得られる合金化溶融亜鉛めっき鋼板であって、
前記めっき層の組成がＦｅ：１２〜１５質量％、Ａｌ：
０．０５〜０．５０質量％、残部Ｚｎ及び不可避不純物
からなり、目付量が２５〜９０ｇ／ｍ2のめっき層を少
なくとも片面に有すると共に、地鉄とめっき層との界面
に形成されるΓ相の厚みが平均１．０μｍ以下（０を含
まず）で、めっき層表面にη相及びζ相が存在しないこ
とを特徴とする合金化溶融亜鉛めっき鋼板である。この
場合、前記めっき層のＡｌ含有量が０．２２〜０．３５
質量％であると一層好ましい。That is, according to the present invention, a steel sheet is immersed in a hot dip galvanizing bath to form a plating layer on the surface thereof, and then the steel sheet pulled out of the plating bath is heated to alloy the plating layer. A galvanized steel sheet,
The composition of the plating layer is Fe: 12 to 15 mass%, Al:
0.05 to 0.50% by mass, balance Zn and unavoidable impurities, and a coating layer having a basis weight of 25 to 90 g / m 2 on at least one side, and formed at the interface between the base metal and the plating layer. A hot-dip galvanized steel sheet having an average phase thickness of 1.0 μm or less (not including 0) and having no η phase or ζ phase on the surface of the plated layer. In this case, the Al content of the plating layer is 0.22 to 0.35.
It is even more preferable if it is mass%.
【００１０】本発明によれば、自動車等の部品にプレス
加工しても、耐パウダリング性や摺動性において問題の
生じない合金化溶融亜鉛めっき鋼板が安定して入手でき
るようになる。According to the present invention, it becomes possible to stably obtain an alloyed hot-dip galvanized steel sheet which does not cause a problem in powdering resistance and slidability even when pressed into parts such as automobiles.
【００１１】[0011]
【発明の実施の形態】以下に、本発明の実施の形態を説
明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
【００１２】まず、本発明に係わる合金化溶融亜鉛めっ
き鋼板は、耐パウダリング性に対し不利なΓ相の厚みを
抑制しなければならない。このため、発明者は、多くの
試験操業を行い、その結果の解析より、地鉄／めっき層
界面のΓ相の厚みは、平均１．０μｍとする必要がある
ことを見出し、それを本発明の１要件にした。１．０μ
ｍを超えると、耐パウダリング性が著しく劣化するから
である。First, the alloyed hot-dip galvanized steel sheet according to the present invention must suppress the thickness of the Γ phase, which is disadvantageous to the powdering resistance. Therefore, the inventor conducted many test operations, and based on the analysis of the results, found that the thickness of the Γ phase at the base iron / plating layer interface needs to be 1.0 μm on average, It was made into 1 requirement. 1.0μ
This is because if it exceeds m, the powdering resistance is significantly deteriorated.
【００１３】また、めっき層中のη相およびζ相は存在
してはならない。この要件は、めっき層にη相およびζ
相が存在すると、そのような合金化溶融亜鉛めっき鋼板
をプレス成形した時に、所謂「型かじり」という現象が
発生し、摺動性が低下するからである。ここで「存在し
ない」とは、η相及びζ相の量をＸ線回折の半定量にお
いてもほとんど検出されない程度にまで低減させること
である。このような合金化溶融亜鉛めっき鋼板の製造
は、ζ相を低減させるために、亜鉛浴成分や合金化温度
に加えて、特に合金化昇温速度及び冷却速度の両者が重
要であることを見出し、これらを管理することで達成が
可能になった。Further, the η phase and the ζ phase in the plating layer must not exist. This requirement is that the η phase and ζ
This is because when a phase is present, a phenomenon called "mold galling" occurs when such an alloyed hot-dip galvanized steel sheet is press-formed, and the slidability deteriorates. Here, “absent” means that the amounts of the η phase and the ζ phase are reduced to such an extent that they are hardly detected even in the semiquantitative determination of X-ray diffraction. In the production of such alloyed hot-dip galvanized steel sheet, it was found that, in addition to the zinc bath component and the alloying temperature, both the alloying temperature rising rate and the cooling rate are important in order to reduce the ζ phase. , It was possible to achieve by managing these.
【００１４】次に、発明者は、前記したΓ相、η相及び
ζ相に関する特性を得るために必要なめっき層の要件に
ついて検討した。そして、めっき層の組成がＦｅ：１２
〜１５質量％、Ａｌ：０．０５〜０．５０質量％、残部
Ｚｎ及び不可避不純物からなる組成であることを見出し
た。Next, the inventor examined the requirements of the plating layer necessary to obtain the above-mentioned characteristics concerning the Γ phase, the η phase and the ζ phase. The composition of the plating layer is Fe: 12
It was found that the composition consisted of ˜15% by mass, Al: 0.05 to 0.50% by mass, the balance Zn and unavoidable impurities.
【００１５】亜鉛めっき層のＡｌ含有量を０．０５〜
０．５０質量％にするのは、０．０５質量％未満では、
合金化で加熱処理する際に、地鉄とめっき層との界面に
厚みが１μｍ以上のΓ相が出現し、耐パウダリング性を
劣化させ、０．５０質量％超えでは、合金化の進行が遅
くなり、焼けムラと呼ばれる金属光沢の欠陥を呈するめ
っき外観になるからである。この合金化の進行遅れの対
策として、焼けムラ防止に加熱温度を高めたり、加熱時
間を延ばしても、結果としては、前記したように、地鉄
とめっき層との界面に厚みが１μｍ以上のΓ相が出現
し、耐パウダリング性を劣化させる。なお、実際には、
前記めっき層のＡｌ含有量は、０．２２〜０．３５質量
％であるのが一層好ましい。The Al content of the galvanized layer is 0.05 to
0.50 mass% is less than 0.05 mass%,
At the time of heat treatment for alloying, a Γ phase having a thickness of 1 μm or more appears at the interface between the base metal and the plating layer, deteriorating the powdering resistance, and if it exceeds 0.50% by mass, the alloying progresses. This is because the plating appearance becomes slower and exhibits a metallic luster defect called uneven burning. As a measure against the delay in the progress of alloying, even if the heating temperature is increased to prevent uneven burning or the heating time is extended, as a result, as described above, the thickness of the interface between the base metal and the plating layer is 1 μm or more. The Γ phase appears and deteriorates the powdering resistance. In addition, in fact,
The Al content of the plating layer is more preferably 0.22 to 0.35 mass%.
【００１６】また、めっき層のＦｅ含有率を１２〜１５
質量％にするのは、１２質量％未満だとめっき層の表面
にζ相が残り、摺動性が低下し、１５質量％超えでは地
鉄とめっき層との界面にΓ相が１μｍ以上の厚みで成長
してしまい、耐パウダリング性を劣化させてしまうから
である。Further, the Fe content of the plating layer is set to 12 to 15
If it is less than 12% by mass, the ζ phase remains on the surface of the plating layer and the slidability deteriorates. If it exceeds 15% by mass, the Γ phase at the interface between the base metal and the plating layer is 1 μm or more. This is because it grows with a thickness and deteriorates the powdering resistance.
【００１７】さらに、本発明では、めっき層の目付量
は、片面において２５〜９０ｇ／ｍ2とする必要があ
る。その理由は、目付量が２５ｇ／ｍ2未満では、耐食
性が悪化し、９０ｇ／ｍ2超では、そのめっき厚みによ
る曲げ加工時の表面に働く引っ張り及び圧縮の応力が高
くなり、結果的に不都合だからである。Further, in the present invention, the basis weight of the plating layer needs to be 25 to 90 g / m 2 on one side. The reason is that when the basis weight is less than 25 g / m 2 , the corrosion resistance deteriorates, and when it exceeds 90 g / m 2 , the tensile and compression stresses that act on the surface during bending due to the plating thickness become high, resulting in inconvenience. That's why.
【００１８】以下、実施例において、本発明に係る合金
化溶融亜鉛めっき鋼板の製造条件を具体的に示すと共
に、得られた合金化溶融亜鉛めっき鋼板の評価を行う。In the following examples, the production conditions of the galvannealed steel sheet according to the present invention will be specifically shown, and the obtained galvannealed steel sheet will be evaluated.
【００１９】[0019]
【実施例】表１に示す組成のＴｉ-Ｎｂ系の極低炭素鋼
からなる鋼鋳片を冷間圧延し、得られた冷延鋼帯を未焼
鈍の状態で連続式溶融亜鉛めっき装置（所謂オールラジ
アントチューブ型ＣＧＬ）を通過させて、種々の条件下
で溶融亜鉛めっき及びめっき層の合金化を行った。その
際の該連続式溶融亜鉛めっき装置に対する通板速度は、
６０〜１００ｍ／ｍｉｎとした。そして、得られた合金
化溶融亜鉛めっき鋼帯より試料片を採取し、下記の耐パ
ウダリング性試験及び摺動性試験を行い、耐パウダリン
グ性及び摺動性を調査した。EXAMPLE A steel slab made of a Ti—Nb-based ultra-low carbon steel having the composition shown in Table 1 was cold-rolled, and the cold-rolled steel strip thus obtained was continuously annealed in an unannealed state ( The so-called all-radiant tube type CGL) was passed through to carry out hot dip galvanization and alloying of the plating layer under various conditions. At that time, the plate passing speed for the continuous hot dip galvanizing apparatus is
It was set to 60 to 100 m / min. Then, a sample piece was taken from the obtained galvannealed steel strip, and the following powdering resistance test and slidability test were conducted to investigate the powdering resistance and slidability.
【００２０】試験結果を参照すると、本発明例は、パウ
ダリング試験及び摺動性試験の両方が優れており、いず
れかの試験結果が劣る比較例よりも、自動車等の部品に
プレス加工する合金化溶融亜鉛めっき鋼板として適する
ことが明らかである。Referring to the test results, the invention examples are superior in both the powdering test and the slidability test, and the alloys to be pressed into parts such as automobiles are better than the comparative examples in which either test result is inferior. It is clear that it is suitable as a galvanized steel sheet.
【００２１】[0021]
【表１】 [Table 1]
【００２２】（１）耐パウダリング性試験
平面サイズが８０×８０ｍｍの試験片（厚み０．８ｍ
ｍ）にビニールテープを貼り、該テープを貼った面を内
側にして、二つ折で６０°までの角度で曲げ伸ばした
後、テープを剥がしてめっき層が該テープに付着して黒
変した部分の面積割合で相対的に判断した。つまり、該
面積割合の小さいものを耐パウダリング性が良好（記号
○）、大きいものを劣（記号×）、中間を普通（記号
△）として評価した。
（２）摺動性試験
平面サイズが幅２０ｍｍ×長さ２００ｍｍ（厚み０．８
ｍｍ）の試験片１を図１に示すように、上下一対の平板
金型２（Ｒは角部の曲率半径）の間を一定の押し付け力
（Ｐ：単位Ｎ）の下で通過させ、引き抜き力（Ｆ：単位
Ｎ）を測定し、下記式で摩擦係数（μ）を求めた。つま
り、この摩擦係数が小さいものほど摺動性が良好とし
た。なお、この場合、試験片１と平板金型２との接触面
積は、１０×２０ｍｍ，押し付け圧力（Ｐ）は１９６２
Ｎとした。(1) Powdering resistance test test piece having a plane size of 80 × 80 mm (thickness 0.8 m
m) a vinyl tape is applied, the surface with the tape applied is inward, and the tape is peeled off at an angle of up to 60 °, then the tape is peeled off and the plating layer adheres to the tape and turns black. It was judged relative to the area ratio. That is, the one having a small area ratio was evaluated as having a good powdering resistance (symbol ◯), the one having a large area ratio was inferior (symbol ×), and the middle was evaluated as normal (symbol Δ). (2) Sliding property test Plane size: width 20 mm x length 200 mm (thickness 0.8
As shown in FIG. 1, the test piece 1 of (mm) is passed between a pair of upper and lower flat plate dies 2 (R is a radius of curvature of a corner) under a constant pressing force (P: unit N), and then pulled out. The force (F: unit N) was measured, and the friction coefficient (μ) was determined by the following formula. That is, the smaller the friction coefficient, the better the slidability. In this case, the contact area between the test piece 1 and the flat plate mold 2 was 10 × 20 mm, and the pressing pressure (P) was 1962.
It was set to N.
【００２３】これらの試験結果を、溶融亜鉛めっき及び
合金化の条件と共に一括して表２に示す。表２より、Ｆ
ｅ含有率：１２〜１５質量％、めっき層中のＡｌ濃度：
０．０５〜０．５質量％、残部Ｚｎからなる組成であっ
て、地鉄とめっき層との界面のΓ相が平均１．０μｍ以
下で、めっき層表面にη相及びζ相が存在しない本発明
に係る合金化溶融亜鉛めっき鋼板は、耐パウダリング性
及び摺動性のいずれもが、本発明の要件を満足していな
い比較例に比べて優れていることが明らかである。The results of these tests are shown in Table 2 together with the conditions of hot dip galvanizing and alloying. From Table 2, F
e content rate: 12 to 15 mass%, Al concentration in the plating layer:
The composition is composed of 0.05 to 0.5 mass% and the balance Zn, the Γ phase at the interface between the base iron and the plating layer is 1.0 μm or less on average, and the η phase and the ζ phase do not exist on the plating layer surface. It is clear that the alloyed hot-dip galvanized steel sheet according to the present invention is superior in both powdering resistance and slidability as compared with Comparative Examples that do not satisfy the requirements of the present invention.
【００２４】[0024]
【表２】 [Table 2]
【００２５】[0025]
【発明の効果】以上、説明したように、本発明により、
自動車等の部品にプレス加工しても、耐パウダリング性
や摺動性において問題の生じない合金化溶融亜鉛めっき
鋼板が提供できる。As described above, according to the present invention,
It is possible to provide an alloyed hot-dip galvanized steel sheet that does not cause a problem in powdering resistance and slidability even when pressed into parts such as automobiles.
【図面の簡単な説明】[Brief description of drawings]
【図１】摺動性試験を行った装置を示す横断面図であ
る。FIG. 1 is a cross-sectional view showing an apparatus that has been tested for slidability.
１ 試験片 ２ 平板金型 1 test piece 2 Flat plate mold
Claims (2)
表面にめっき層を形成させ、次いでめっき浴から引き上
げた鋼板を加熱して、めっき層を合金化して得られる合
金化溶融亜鉛めっき鋼板であって、 前記めっき層の組成がＦｅ：１２〜１５質量％、Ａｌ：
０．０５〜０．５０質量％、残部Ｚｎ及び不可避不純物
からなり、目付量が２５〜９０ｇ／ｍ2のめっき層を少
なくとも片面に有すると共に、地鉄とめっき層との界面
に形成されるΓ相の厚みが平均１．０μｍ以下（０を含
まず）で、めっき層表面にη相及びζ相が存在しないこ
とを特徴とする合金化溶融亜鉛めっき鋼板。1. An alloyed hot dip galvanized steel sheet obtained by dipping a steel sheet in a hot dip galvanizing bath to form a plating layer on the surface of the steel sheet and then heating the steel sheet pulled out of the plating bath to alloy the plating layer. And the composition of the plating layer is Fe: 12 to 15 mass%, Al:
0.05 to 0.50% by mass, balance Zn and unavoidable impurities, and a coating layer having a basis weight of 25 to 90 g / m 2 on at least one side, and formed at the interface between the base metal and the plating layer. An alloyed hot dip galvanized steel sheet having an average phase thickness of 1.0 μm or less (not including 0) and having no η phase or ζ phase on the surface of the plating layer.
０．３５質量％であることを特徴とする請求項１記載の
合金化溶融亜鉛めっき鋼板。2. The Al content of the plating layer is 0.22 to 0.22.
The galvannealed steel sheet according to claim 1, wherein the galvannealed steel sheet is 0.35% by mass.
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|---|---|---|---|
| JP2002051503A JP2003253416A (en) | 2002-02-27 | 2002-02-27 | Hot-dip zincing steel sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002051503A JP2003253416A (en) | 2002-02-27 | 2002-02-27 | Hot-dip zincing steel sheet |
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|---|---|
| JP2003253416A true JP2003253416A (en) | 2003-09-10 |
Family
ID=28663459
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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| Country | Link |
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