JPH06248409A - Checkered steel plate excellent in workability and corrosion resistance - Google Patents
Checkered steel plate excellent in workability and corrosion resistanceInfo
- Publication number
- JPH06248409A JPH06248409A JP3293193A JP3293193A JPH06248409A JP H06248409 A JPH06248409 A JP H06248409A JP 3293193 A JP3293193 A JP 3293193A JP 3293193 A JP3293193 A JP 3293193A JP H06248409 A JPH06248409 A JP H06248409A
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- Prior art keywords
- layer
- corrosion resistance
- workability
- steel plate
- steel sheet
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は床板をはじめ構造物の化
粧板などに用いられる縞鋼板に関し、特に加工性、耐蝕
性に優れた縞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 striped steel sheet used as a decorative board for structures such as floor boards, and more particularly to a striped steel sheet excellent in workability and corrosion resistance.
【０００２】[0002]
【従来の技術】縞鋼板は鋼板の片面に図１に示す様に、
熱間圧延により圧延方向に対し角度Ａで、幅Ｃ、長さ
Ｂ、高さＨの突起をピッチＥでつけた鋼板であり、主に
床板に用いられる。2. Description of the Related Art Striped steel plates are formed on one side of a steel plate as shown in FIG.
It is a steel plate formed by hot rolling at an angle A with respect to the rolling direction and having protrusions having a width C, a length B, and a height H at a pitch E, and is mainly used for floor boards.
【０００３】従来、その使用方法は熱間圧延のまま、又
は塗装して使用されて来た。しかしながら、近年防錆を
考慮し縞鋼板上に溶融亜鉛めっきをして使用される様に
なって来た。Conventionally, the method of use has been hot rolling or coating. However, in recent years, in consideration of rust prevention, hot-dip galvanizing has been performed on striped steel sheets for use.
【０００４】従来、一般に良耐蝕性縞鋼板とはバッチ式
の溶融亜鉛めっきにより得られており、「鉛と亜鉛」第
１６５号「溶融亜鉛めっきの一般的な特性」の中にある
様に、脱脂処理、ブラスト処理、酸洗処理、フラックス
処理からなる前処理作業、溶融亜鉛めっき工程、冷却か
らなるめっき作業とから製造されていたが、この様にし
て得られた良耐蝕性縞鋼板は、図４に示す様に縞鋼板１
の表面に、第１層としてＺｎ−Ｆｅ合金層５を有し、第
２層としてＺｎ層６を有する。通常は床用鋼板の耐蝕性
を確保するために、第１層、第２層合わせて５μｍ以上
の厚みになる様にする。バッチ式の製造方法では、第１
層の厚みは５０％以上になるため、この場合２μｍを超
す事になる。Conventionally, a striped steel sheet with good corrosion resistance is generally obtained by batch-type hot dip galvanizing, and as described in "Lead and Zinc" No. 165 "General characteristics of hot dip galvanizing", Degreasing treatment, blasting treatment, pickling treatment, pretreatment work consisting of flux treatment, hot dip galvanizing process, was manufactured from the plating work consisting of cooling, the good corrosion-resistant striped steel sheet thus obtained, Striped steel plate 1 as shown in FIG.
Has a Zn—Fe alloy layer 5 as a first layer and a Zn layer 6 as a second layer. Usually, in order to ensure the corrosion resistance of the floor steel sheet, the total thickness of the first layer and the second layer is 5 μm or more. In the batch type manufacturing method,
Since the layer thickness is 50% or more, in this case, it exceeds 2 μm.
【０００５】縞鋼板を構造物等に使用する場合は加工が
必要となるが、従来の様にバッチ式で溶融亜鉛めっきし
た縞鋼板では加工後、溶融亜鉛めっき層に割れが入り、
剥離してしまうため、溶融亜鉛めっきした後に加工する
事は極めて難しかった。これは、比較的固く、脆いＺｎ
−Ｆｅ合金層５の厚みが厚いために生じる。When the striped steel sheet is used for a structure or the like, it is necessary to process it. However, in the case of a striped steel sheet which is hot-dip galvanized by a batch method as in the past, after the processing, the hot-dip galvanized layer is cracked,
Since it peels off, it was extremely difficult to process it after hot-dip galvanizing. This is a relatively hard and brittle Zn
This occurs because the thickness of the —Fe alloy layer 5 is large.
【０００６】本発明者らの調査結果によれば、溶融亜鉛
めっきをした縞鋼板を加工するには、地鉄と溶融亜鉛め
っき層の間に存在する合金層つまり従来法においては第
１層であるＺｎ−Ｆｅ合金層５を２μｍ以下にする必要
がある。しかしながら、従来法で得られた縞鋼板では第
１層の厚みが５０％以上あるため、第１層の厚みを２μ
ｍ以下にしようとすると、第１層、第２層合わせためっ
き層の厚みは４μｍ以下となり充分な耐蝕性を確保する
ことが出来ない。According to the investigation results of the present inventors, in order to process a striped steel sheet subjected to hot dip galvanization, the alloy layer existing between the base iron and the hot dip galvanized layer, that is, the first layer in the conventional method is used. It is necessary to make a certain Zn-Fe alloy layer 5 2 μm or less. However, in the striped steel sheet obtained by the conventional method, the thickness of the first layer is 50% or more.
If the thickness is set to m or less, the thickness of the plating layer including the first layer and the second layer becomes 4 μm or less, and sufficient corrosion resistance cannot be ensured.
【０００７】この様に、従来法では耐蝕性を確保しつ
つ、且つ加工する事が出来る縞鋼板は得られなかった。As described above, the conventional method has not been able to obtain a striped steel sheet which can be processed while ensuring corrosion resistance.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、加工性、耐
蝕性に優れた縞鋼板を提供する事にある。DISCLOSURE OF THE INVENTION The present invention is to provide a striped steel sheet excellent in workability and corrosion resistance.
【０００９】[0009]
【課題を解決するための手段】本発明者らは、上記課題
を解決すべく、様々なめっき層構造よりなるめっき縞鋼
板を作成し密着性テストを行なった。In order to solve the above problems, the inventors of the present invention prepared plated strip steel sheets having various plating layer structures and conducted an adhesion test.
【００１０】その結果、加工性、耐蝕性に優れた縞鋼板
を得るには、第１層にＦｅ−Ａｌ−Ｚｎ合金層、第２層
にＺｎ−Ｆｅ合金層、第３層に重量換算で１％以下のＡ
ｌを有するＺｎ−Ａｌ層からなるめっき層中の第２層で
あるＺｎ−Ｆｅ合金層の厚みを２μｍ以下とし、第１
層、第２層、第３層合わせためっき層全体の厚みが５μ
ｍ以上になる縞鋼板を得ればよい事を見出した。As a result, in order to obtain a striped steel sheet excellent in workability and corrosion resistance, the first layer is a Fe—Al—Zn alloy layer, the second layer is a Zn—Fe alloy layer, and the third layer is in terms of weight. A less than 1%
The thickness of the Zn-Fe alloy layer, which is the second layer in the plating layer formed of the Zn-Al layer having 1
The total thickness of the plating layer including the 3rd layer, the 2nd layer and the 3rd layer is 5μ
It was found that a striped steel plate having a size of m or more should be obtained.
【００１１】以下、図面を用いて本発明を詳細に説明す
る。まず図１に本発明の対象となる縞鋼板の形状を示
す。次に図２に本発明鋼板のめっき層構造を示す。本発
明鋼板は地鉄が縞鋼板１であり、第１層としてＦｅ−Ａ
ｌ−Ｚｎ合金層２を有し、第２層に厚みが２μｍ以下の
Ｚｎ−Ｆｅ合金層３を有し、第３層に重量換算で１％以
下のＡｌを含むＺｎ−Ａｌ層４を有し、第１層、第２
層、第３層合わせためっき層全体の厚みが５μｍ以上で
ある。ここで、第１層であるＦｅ−Ａｌ−Ｚｎ合金層２
は第２層であるＺｎ−Ｆｅ合金層３の成長を抑制する効
果があると同時に、地鉄の縞鋼板１と第２層のＺｎ−Ｆ
ｅ合金層３との一種のバインダー的効果があると考えら
れる。又、第２層のＺｎ−Ｆｅ合金層３は比較的硬く、
脆いが２μｍ以下であれば加工性は良好となる。これら
の効果により、本発明鋼板は良好な加工性をえる事が出
来る。第３層であるＺｎ−Ａｌ層４は、比較的軟らかく
加工性を悪化させる事はなく、むしろ耐蝕性を確保する
ためのものであり、第１層、第２層、第３層合わせため
っき層全体の厚みを５μｍ以上にする事で耐蝕性は良好
となる。この様なめっきを施した縞鋼板は、密着性テス
トの結果、同一目付量のメッキ材において従来のフラッ
クス法より優れている。The present invention will be described in detail below with reference to the drawings. First, FIG. 1 shows the shape of a striped steel plate that is the subject of the present invention. Next, FIG. 2 shows the plating layer structure of the steel sheet of the present invention. In the steel sheet of the present invention, the base steel is the striped steel sheet 1, and Fe-A is used as the first layer.
1-Zn alloy layer 2, the second layer has a Zn-Fe alloy layer 3 having a thickness of 2 μm or less, and the third layer has a Zn-Al layer 4 containing 1% or less Al by weight. Then the first layer, the second
The total thickness of the plating layer including the third layer and the third layer is 5 μm or more. Here, the Fe-Al-Zn alloy layer 2 which is the first layer
Has the effect of suppressing the growth of the Zn-Fe alloy layer 3 which is the second layer, and at the same time the striped steel plate 1 of the base metal and the Zn-F of the second layer.
It is considered that there is a kind of binder effect with the e-alloy layer 3. Further, the Zn-Fe alloy layer 3 of the second layer is relatively hard,
If it is fragile but not more than 2 μm, the workability becomes good. Due to these effects, the steel sheet of the present invention can have good workability. The Zn—Al layer 4, which is the third layer, is relatively soft and does not deteriorate workability, but rather is for ensuring corrosion resistance. The plating of the first layer, the second layer, and the third layer is performed together. By setting the thickness of the entire layer to 5 μm or more, the corrosion resistance becomes good. As a result of the adhesion test, the striped steel sheet plated in this way is superior to the conventional flux method in the plated material having the same basis weight.
【００１２】又、図３に第３層のＺｎ−Ａｌ層４中のＡ
ｌ濃度を０．３％とし、第１層、第２層、第３層合わせ
ためっき層全体の厚みを３０μｍとした時の、第２層で
あるＺｎ−Ｆｅ合金層３の厚みと、めっき密着性の関係
を示す。この時、第１層であるＦｅ−Ａｌ−Ｚｎ合金層
２の厚みは０．５μｍ以下である。又、めっき密着性は
表１に示す基準で評価した。めっき密着性は、第２層で
あるＺｎ−Ｆｅ合金層３の厚みが２μｍ以下で良好であ
る。Further, in FIG. 3, A in the third Zn-Al layer 4 is used.
The thickness of the Zn—Fe alloy layer 3, which is the second layer, when the total concentration of the plating layers including the first layer, the second layer, and the third layer is 30 μm, and the concentration is 0.3%. The relationship of adhesion is shown. At this time, the thickness of the Fe—Al—Zn alloy layer 2 as the first layer is 0.5 μm or less. The plating adhesion was evaluated according to the criteria shown in Table 1. The plating adhesion is good when the thickness of the Zn—Fe alloy layer 3 as the second layer is 2 μm or less.
【００１３】耐蝕性を考慮した場合、第３層であるＺｎ
−Ａｌ層４において層中のＡｌが重量換算で１％を超え
るとＺｎ−Ａｌの局部電池を形成し耐蝕性が劣化するた
め１％以下が好ましい。Considering the corrosion resistance, the third layer Zn
In the -Al layer 4, if the Al content in the layer exceeds 1% by weight, a Zn-Al local battery is formed and the corrosion resistance deteriorates, so 1% or less is preferable.
【００１４】母材となる縞鋼板１は、熱延Ａｌキルド鋼
や高張力鋼板等種々の物が適用出来る。Various materials such as hot rolled Al-killed steel and high-strength steel can be applied to the striped steel plate 1 as the base material.
【００１５】製造法は特に限定しないが、例えば一般的
なゼンジマー法により得ることが出来る。つまり、熱間
圧延後の縞鋼板を酸洗し、雰囲気温度５５０℃以上、Ｈ
2 濃度１０％以上の雰囲気下において鋼板表面を還元し
活性な状態にした後、重量換算で１％以下のＡｌを含む
溶融亜鉛浴へ侵入させ、その直上に配置された溶融亜鉛
付着量調整装置により付着量を調整し、以降冷却する事
で、加工性、耐蝕性に優れた縞鋼板コイルとして得る事
が出来る。The production method is not particularly limited, but it can be obtained by, for example, a general Sendzimer method. That is, the striped steel sheet after hot rolling is pickled, and the atmospheric temperature is 550 ° C. or higher, and H
(2 ) After reducing the steel plate surface to an active state in an atmosphere with a concentration of 10% or more, it is introduced into a molten zinc bath containing 1% or less by weight of Al, and the molten zinc adhesion amount adjusting device is arranged immediately above it. By adjusting the amount of adhesion by means of the above and then cooling, it is possible to obtain a striped steel plate coil excellent in workability and corrosion resistance.
【００１６】[0016]
【作用】本発明により得られた良加工性、良耐蝕性縞鋼
板の第１層であるＦｅ−Ａｌ−Ｚｎ合金層２は、溶融亜
鉛めっき後の加熱処理等、意図的に合金層を成長させな
い限り合金層の成長を抑制する効果、つまり、バリヤー
効果が有り、第２層のＺｎ−Ｆｅ合金層３を過大成長さ
せない作用がある。又、そのため、第１層、第２層、及
び第３層を合わせためっき層を充分な耐蝕性を確保する
ために５μｍ以上にしても、第２層であるＺｎ−Ｆｅ合
金層３の厚みは２μｍ以下となる。又、このＦｅ−Ａｌ
−Ｚｎ合金層２は、地鉄の縞鋼板１と第２層であるＺｎ
−Ｆｅ合金層３との一種のバインダー効果を果たすと考
えられる。第２層であるＺｎ−Ｆｅ合金層３は、比較的
硬く、脆いが２μｍ以下であれば加工性は良好となる。
これらの効果により、本発明鋼板は良好な加工性をえる
事が出来る。第３層であるＺｎ−Ａｌ層４は、比較的軟
らかく加工性を悪化させる事はなく、むしろ耐蝕性を確
保するためのものであり、第１層、第２層、第３層合わ
せためっき層全体の厚みを５μｍ以上にする事で耐蝕性
は良好となる。The Fe-Al-Zn alloy layer 2, which is the first layer of the striped steel sheet with good workability and good corrosion resistance obtained by the present invention, intentionally grows an alloy layer by heat treatment after hot dip galvanizing. Unless it is made, there is an effect of suppressing the growth of the alloy layer, that is, a barrier effect and an effect of preventing the Zn—Fe alloy layer 3 of the second layer from growing excessively. Therefore, even if the plating layer including the first layer, the second layer, and the third layer is 5 μm or more in order to ensure sufficient corrosion resistance, the thickness of the Zn—Fe alloy layer 3 as the second layer Is 2 μm or less. Also, this Fe-Al
-Zn alloy layer 2 is striped steel plate 1 of base metal and Zn which is the second layer.
It is considered to have a kind of binder effect with the —Fe alloy layer 3. The Zn—Fe alloy layer 3, which is the second layer, is relatively hard and brittle, but if it is 2 μm or less, the workability becomes good.
Due to these effects, the steel sheet of the present invention can have good workability. The Zn—Al layer 4, which is the third layer, is relatively soft and does not deteriorate workability, but rather is for ensuring corrosion resistance. The plating of the first layer, the second layer, and the third layer is performed together. By setting the thickness of the entire layer to 5 μm or more, the corrosion resistance becomes good.
【００１７】[0017]
【実施例】本発明により提供する良加工性、良耐蝕性鋼
板を実施例、及び比較例で具体的に説明する。EXAMPLES The good workability and corrosion resistant steel plates provided by the present invention will be specifically described with reference to Examples and Comparative Examples.
【００１８】（本発明例の製造方法）母材に熱延Ａｌキ
ルド鋼を用いた図１に示す様な角度Ａ＝４５°、幅Ｃ＝
５．１ｍｍ、長さＢ＝２５．３ｍｍ、高さＨ＝２．０ｍ
ｍの突起がピッチＥ＝２８．６ｍｍで規則的に配列した
縞鋼板を、酸洗した後、雰囲気温度６００℃、Ｈ2 濃度
１５％の還元雰囲気中で加熱還元し、引き続いて重量換
算で０．１、０．３、０．６％のＡｌを添加した溶融亜
鉛浴へ浸漬させて製造した。浸漬時間は１０秒とし、第
１層、第２層、第３層合わせためっき層全体の厚みは、
溶融亜鉛めっき装置出側の溶融亜鉛付着量調整装置によ
り調整した。(Manufacturing method of the example of the present invention) Hot rolled Al killed steel was used as the base material, and angle A = 45 ° and width C = as shown in FIG.
5.1 mm, length B = 25.3 mm, height H = 2.0 m
The striped steel plate in which the projections of m are regularly arranged at a pitch E = 28.6 mm is pickled, and then heat-reduced in a reducing atmosphere at an atmospheric temperature of 600 ° C. and a H 2 concentration of 15%, and subsequently 0 in terms of weight. It was manufactured by immersing it in a molten zinc bath containing Al, 0.3, 0.6%. The immersion time was 10 seconds, and the total thickness of the plating layers including the first layer, the second layer, and the third layer was
It was adjusted by the hot-dip galvanizing device outlet adjustment device.
【００１９】（比較例の製造方法）比較例においても、
母材に熱延Ａｌギルド鋼を用い本発明例の製造方法で用
いた縞鋼板と同様の形状の母材を用いて製造した。製造
方法は、「鉛と亜鉛」第１６５号「溶融亜鉛めっきの一
般的な特性」にある製造方法に基づいて、縞鋼板を脱
脂、酸洗した後、塩化アンモニウムでフラックス処理を
し、Ａｌの添加されていない４５０℃の溶融亜鉛浴へ浸
漬させて製造した。亜鉛めっき付着量は、溶融亜鉛浴へ
の浸漬時間を変えて調整した。(Manufacturing Method of Comparative Example) Also in the comparative example,
A hot rolled Al guild steel was used as a base material, and a base material having the same shape as the striped steel sheet used in the manufacturing method of the present invention was used for manufacturing. The manufacturing method is based on the manufacturing method in "Lead and Zinc" No. 165 "General characteristics of hot-dip galvanizing". After degreasing and pickling the striped steel sheet, a flux treatment with ammonium chloride is performed to remove Al. It was manufactured by immersing it in a molten zinc bath at 450 ° C. to which it was not added. The amount of zinc plating deposited was adjusted by changing the immersion time in the molten zinc bath.
【００２０】本発明例の製造方法と比較例の製造方法に
より、本発明例１〜３と比較例１〜３のサンプルを作成
した。作成したサンプル鋼板より試験片を切出し、９０
度曲げ試験により加工後めっき層の密着性評価を行なっ
た。めっき密着性は、表１に示す基準で評価した。その
結果を表２に示した。Samples of Examples 1 to 3 of the present invention and Comparative Examples 1 to 3 were prepared by the method of the present invention and the method of the comparative example. Cut a test piece from the created sample steel plate,
After processing, the adhesion of the plated layer was evaluated by a bending test. The plating adhesion was evaluated according to the criteria shown in Table 1. The results are shown in Table 2.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【表２】 [Table 2]
【００２３】表２から明らかな様に、本発明の床用鋼板
は充分な耐蝕性を得るだけの溶融亜鉛めっきをしても、
加工性に優れている事がわかる。As is clear from Table 2, the floor steel sheet of the present invention can be hot-dip galvanized to obtain sufficient corrosion resistance,
You can see that it has excellent workability.
【００２４】[0024]
【発明の効果】本発明の縞鋼板は加工性、耐蝕性ともに
優れるため、床鋼板その他に広く適用可能であり、その
工業的意義は非常に大きい。Since the striped steel sheet of the present invention is excellent in workability and corrosion resistance, it can be widely applied to floor steel sheets and the like, and its industrial significance is very large.
【図１】縞鋼板の説明図で、（ａ）は平面図、（ｂ）は
（ａ）のＧ−Ｇ’断面図、（ｃ）はＦ−Ｆ’断面図。FIG. 1 is an explanatory view of a striped steel plate, (a) is a plan view, (b) is a GG ′ sectional view of (a), and (c) is a FF ′ sectional view.
【図２】本発明品のメッキ層構造を示す図。FIG. 2 is a diagram showing a plated layer structure of the product of the present invention.
【図３】従来品のメッキ層構造を示す図。FIG. 3 is a diagram showing a plating layer structure of a conventional product.
【図４】第２層であるＺｎ−Ｆｅ合金層３とメッキ密着
性の関係を示した図。FIG. 4 is a diagram showing a relationship between a Zn—Fe alloy layer 3 as a second layer and plating adhesion.
１…縞鋼板 ２…第１層 ３…第２層 ３…第３層 1 ... Striped steel plate 2 ... 1st layer 3 ... 2nd layer 3 ... 3rd layer
フロントページの続き (72)発明者 西村信明 姫路市広畑区富士町１番地 新日本製鐵株 式会社広畑製鐵所内Front page continuation (72) Nobuaki Nishimura Inventor No. 1 Fuji-machi, Hirohata-ku, Himeji City Nippon Steel Co., Ltd. Hirohata Works
Claims (1)
ｌ−Ｚｎ合金層、第２層にＺｎ−Ｆｅ合金層、第３層に
重量換算で１％以下のＡｌを含んだＺｎ−Ａｌ層からな
るめっき層を有し、第２層であるＺｎ−Ｆｅ合金層の厚
みが２μｍ以下で、且つ第１層、第２層、第３層を合計
しためっき層全体の厚みが５μｍ以上である事を特徴と
する、加工性、耐蝕性に優れた縞鋼板。1. Fe-A as a first layer on the surface of a striped steel sheet.
1-Zn alloy layer, the second layer is a Zn-Fe alloy layer, and the third layer is a Zn-Al layer containing a Zn-Al layer containing 1% or less by weight of Al. Stripes excellent in workability and corrosion resistance, characterized in that the Fe alloy layer has a thickness of 2 μm or less, and the total thickness of the plating layers including the first layer, the second layer and the third layer is 5 μm or more. steel sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3293193A JP2825724B2 (en) | 1993-02-23 | 1993-02-23 | Striped steel sheet with excellent workability and corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3293193A JP2825724B2 (en) | 1993-02-23 | 1993-02-23 | Striped steel sheet with excellent workability and corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06248409A true JPH06248409A (en) | 1994-09-06 |
| JP2825724B2 JP2825724B2 (en) | 1998-11-18 |
Family
ID=12372675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3293193A Expired - Fee Related JP2825724B2 (en) | 1993-02-23 | 1993-02-23 | Striped steel sheet with excellent workability and corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2825724B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200044936A (en) | 2017-09-15 | 2020-04-29 | 닛폰세이테츠 가부시키가이샤 | Hot-dip galvanized steel sheet and its manufacturing method |
| CN111411301A (en) * | 2020-05-06 | 2020-07-14 | 攀钢集团西昌钢钒有限公司 | Weather-resistant steel used as roof, weather-resistant steel plate and preparation method thereof |
-
1993
- 1993-02-23 JP JP3293193A patent/JP2825724B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200044936A (en) | 2017-09-15 | 2020-04-29 | 닛폰세이테츠 가부시키가이샤 | Hot-dip galvanized steel sheet and its manufacturing method |
| CN111411301A (en) * | 2020-05-06 | 2020-07-14 | 攀钢集团西昌钢钒有限公司 | Weather-resistant steel used as roof, weather-resistant steel plate and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2825724B2 (en) | 1998-11-18 |
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