JP3574836B2

JP3574836B2 - BeCu alloy clad steel sheet and method of manufacturing the same

Info

Publication number: JP3574836B2
Application number: JP4564496A
Authority: JP
Inventors: 幸彦馬場; 博之泉; 弓彦久野
Original assignee: Japan Steel Works Ltd
Current assignee: Japan Steel Works Ltd
Priority date: 1996-02-08
Filing date: 1996-02-08
Publication date: 2004-10-06
Anticipated expiration: 2016-02-08
Also published as: JPH09216074A

Description

【０００１】
【産業上の利用分野】
本発明は、ＢｅＣｕ合金クラッド鋼板及びその製造方法に関する。
【０００２】
【従来の技術及びその課題】
従来、発電所、海水淡水化プラント等の海水配管には、海生物の付着に起因する発電支障や機器障害を防止するため、塗装等による防汚対策を行つている。しかしながら、塗装等による防汚対策にあつては、メンテナンスの手間、付着物の処理、公害・環境等の問題がある。
そこで、例えばＣｕ−Ｎｉ合金（キュプロニッケル）を合せ材とし、鋼を母材とし、この合せ材と母材とを接合させて防汚対策を施したクラッド鋼板が提案されている。
【０００３】
しかしながら、このような従来のクラッド鋼板にあつては、比較的短期での海生物の付着防止効果が認められるが、長期になるとその持続性が低下し、防汚性が損なわれるので、定期的に清掃が必要とされていた。
【０００４】
このため、本発明者等は、Ｃｕ−Ｎｉ合金を使用せずに、海生物の付着しない防汚性に優れるクラッド鋼板の研究を種々行つた。そして、衝撃で火花の出ない安全工具やコネクター、リレーの接点、海底通信用中継器等に広く応用されているＢｅＣｕ合金が、長期防汚材として有望であることを見出した。
しかし、ＢｅＣｕ合金クラッド鋼板の場合、クラッド鋼板製造時に合せ材の接合面の酸化防止のため知られているＮｉメッキ適用のみでは、ＢｅとＮｉの金属間化合物が生じ易い。更に、クラッド鋼板の使用用途によつて焼きならし等の熱処理を必要とする母材を使用した場合、熱処理によつて脆弱な金属間化合物が成長して接合強度が低下し、実用に耐え得なくなるという技術的課題がある。
【０００５】
【課題を解決するための手段】
本発明は、このような従来の技術的課題に鑑みてなされたもので、その構成は、次の通りである。
請求項１の発明は、Ｂｅを０．５〜２．０重量％含有するＢｅＣｕ合金を合せ材１０とし、合せ材１０の合せ面側に炭素鋼又は低合金鋼からなる母材１１が接合されるＢｅＣｕ合金クラッド鋼板であつて、合せ材１０の合せ面の上にＣｕメッキ層１、Ｎｉメッキ層２の順に、２重メッキ層が形成されていることを特徴とするＢｅＣｕ合金クラッド鋼板である。
請求項２は、Ｂｅを０．５〜２．０重量％含有するＢｅＣｕ合金を合せ材１０とし、合せ材１０の合せ面側に炭素鋼又は低合金鋼からなる母材１１が接合されるＢｅＣｕ合金クラッド鋼板の製造方法であつて、合せ材１０の合せ面の上に１００〜５００μｍの厚さでＣｕメッキ層１を形成し、該Ｃｕメッキ層１の上に２０〜１００μｍの厚さでＮｉメッキ層２を形成した後、合せ材１０のＮｉメッキ層２と母材１１とを重ね合わせた組合せ体に７５０〜８３０℃の温度で加熱圧延を行つて接合させ、その後、必要に応じて７８０〜８２０℃の温度で固溶化熱処理を施すことを特徴とするＢｅＣｕ合金クラッド鋼板の製造方法である。
【０００６】
【作用】
請求項１の発明によれば、合せ材１０がＢｅＣｕ合金からなるので、長期防汚材が得られる。また、合せ材１０は、Ｂｅを０．５〜２．０重量％含有するＢｅＣｕ合金であるので、強固な酸化皮膜が生じ、耐食性に優れると共に、熱間加工性も良好であり、割れが防止できる。また、合せ材１０の合せ面の上にＣｕメッキ層１、Ｎｉメッキ層２の順に、２重メッキ層が形成されているで、Ｃｕメッキ層１によつて合せ材１０中のＢｅの拡散が抑制でき、Ｎｉメッキ層２とＢｅとが、固くて脆い金属間化合物相を作ることが良好に防止されると同時に、Ｃｕメッキ層１の酸化がＮｉメッキ層２によつて防止される。
【０００７】
請求項２によれば、請求項１と同様の作用が得られる他、次の作用が得られる。すなわち、合せ材１０の合せ面の上に形成するＣｕメッキ層１が１００〜５００μｍの厚さを有するので、無益なメッキ作業を抑制しながら、圧延加熱中に合せ材１０中のＢｅがＣｕメッキ層１を拡散貫通し、Ｎｉメッキ層２と反応して脆弱な金属間化合物を作り、接合性が低下することが良好に防止される。また、Ｃｕメッキ層１の上に形成するＮｉメッキ層２が２０〜１００μｍの厚さを有するので、Ｃｕメッキ層１の酸化が良好に防止される。
【０００８】
更に、合せ材１０のＮｉメッキ層２と母材１１とを重ね合わせた組合せ体に、溶解温度以下である７５０〜８３０℃の温度で加熱圧延を行つて接合させるので、所定のクラッド比が容易に得られると共に、合せ材１０を形成するＢｅＣｕ合金の結晶粒が粗大化し、圧延後、表面肌荒れを起こすことが良好に防止される。ＢｅＣｕ合金クラッド鋼板に固溶化熱処理を施し、硬化させる必要がある場合には、７８０〜８２０℃の温度で処理する。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照して説明する。
図１，図２に示すサンドイッチ方式に係るクラッド鋼板の製造方法に使用する組合せ体に基づいて、本発明の第１実施の形態について説明する。
【００１０】
図中において符号１０は合せ材を示し、合せ材１０は耐食性を有する軟質材よりなり、具体的にはＢｅを０．５〜２．０重量％含有するＢｅＣｕ合金である。この合せ材１０の合せ面側には、予め、Ｃｕメッキ層１及びＮｉメッキ層２からなる２重メッキ層を形成する。Ｃｕメッキ層１は、合せ材１０の合せ面に直接形成し、Ｎｉメッキ層２は、Ｃｕメッキ層１の上に形成する。
【００１１】
ここで、Ｃｕメッキ層１の厚さは、１００〜５００μｍとし、また、Ｎｉメッキ層２の厚さは、２０〜１００μｍとする。圧延加熱時に合せ材１０の接合面が酸化されることを防止するためだけであるなら、合せ材１０の合せ面に界面酸化防止のために直接Ｎｉメッキを施せば良い。しかしながら、クラッド化に際して界面酸化防止のために用いるＮｉメッキと合せ材１０中のＢｅとが、固くて脆い金属間化合物相を作るため、バッファ層が必要となつた。そこで、合せ材１０の合せ面にＣｕメッキを施せば、合せ材１０中のＢｅの拡散が抑制でき、金属間化合物の生成を良好に防止できることが分かつた。このため、合せ材１０の合せ面には、Ｃｕメッキ層１の上にＮｉメッキ層２を形成し、Ｂｅの拡散を抑制しながらＣｕメッキ層１の酸化を防止する。
【００１２】
Ｃｕメッキ層１の厚さは、１００μｍ以下では圧延加熱中に合せ材１０中のＢｅがＣｕメッキ層１を拡散貫通し、Ｎｉメッキ層２と反応して上記金属間化合物を作り、接合性が低下する。一方、Ｃｕメッキ層１の厚さが５００μｍ以上になると、Ｂｅの拡散の抑制にとつて過剰厚さとなり、メッキ作業の無駄となる。そこで、Ｃｕメッキ層１の厚さは、１００〜５００μｍとする。また、Ｎｉメッキ層２は、界面酸化防止の目的から、その厚さは２０〜１００μｍとする。更に、合せ材１０中のＢｅの含有量については、０．５重量％以下では、強固な酸化皮膜ができずらく、耐食性に劣ることになる一方、２．０重量％以上では、熱間加工性が低下し、割れが発生しやすくなる。そこで、合せ材１０は、Ｂｅを０．５〜２．０重量％含有するＢｅＣｕ合金（ベリリュウム−銅合金）とする。
【００１３】
１１は母材を示し、実用鋼である炭素鋼又は低合金鋼からなる。この母材１１と合せ材１０のＮｉ（ニッケル）メッキ層２とを密着させた重合板を２組用意し、各合せ材１０を内側として対向させ、サンドイッチ状に組合せる。この合せ材１０と合せ材１０との間には、分離剤Ｓを予め塗布してあり、分離剤Ｓはサンドイッチ状に組合せる前に十分乾燥させる。
【００１４】
次に、両母材１１，１１間に通気孔１４を有する接合板１５を溶接固定する。具体的には、合せ材１０，１０の四周を囲むように、母材１１，１１間に接合板１５を溶接固定し、合せ材１０，１０の周囲に、接合板１５によつて区画され、通気孔１４によつて外気と連通する空間１６を形成する。この組合せ体には、通気孔１４を通して真空処理を施し、通気孔１４を溶接等の手段によつて閉塞させる。なお、分離剤Ｓの種類によつては、この真空処理工程を省略することが可能である。
【００１５】
このようにして製作した組合せ体は、溶解温度以下の温度、具体的には７５０〜８３０℃の範囲の圧延温度に加熱する。所定温度に加熱した組合せ体は図外の圧延機によつて所定の圧延比にて圧延し、各組合せ体の合せ材１０と母材１１とを接合する。圧延後に、接合板１５付近となる母材１１の周縁部を切断除去し、２枚のクラッド鋼板を得る。分離剤Ｓの機能により、合せ材１０，１０の間の剥離面は容易に分離する。
【００１６】
加熱圧延温度については、７５０℃未満では、母材１１の熱間変形能が著しく低下し、所定のクラッド比（板厚比）を得ることが困難になる。一方、加熱圧延温度が８３０℃を超えた場合には、合せ材１０を形成するＢｅＣｕ合金の結晶粒が粗大化し、圧延後、表面肌荒れを起こす。
このようにして２枚のクラッド鋼板が得られたなら、その後、必要に応じて７８０〜８２０℃で固溶化熱処理を施し、硬化させる。
【００１７】
表１には、メッキ層１，２の種類及び厚さを異ならせた本発明材▲１▼〜▲３▼及び比較材▲４▼〜▲６▼に対する、圧延後のＵＴ（超音波探傷試験）、圧延まま材及び固溶化熱処理材のせん断強さ試験（Ｎ／ｍｍ^２）及び側曲げ試験（２ＴＲ）の結果を示す。せん断強さ試験の規格は、ＪＩＳＧ３６０４＞９８Ｎ／ｍｍ^２である。母材１１は、ＳＭ４００Ａ（３７ｍｍ〔ｔ〕×１３０ｍｍ〔ｗ〕×１８０ｍｍ〔Ｌ〕）とし、合せ材１０，１０（Ｂｅ２．０重量％）は、それぞれＢ３１３０Ｃ１７２０（９ｍｍ〔ｔ〕×１２０ｍｍ〔ｗ〕×１７０ｍｍ〔Ｌ〕）とした。
圧延条件は、次の通りである。
加熱条件：８００℃×３ｈｒｓ
圧延比：２．５
圧下率：１パス当たり５〜１５％
また、固溶化熱処理の条件は、８００℃×３０ｍｉｎ、空冷とした。
【００１８】
【表１】

【００１９】
表１から、本発明材▲１▼〜▲３▼は比較材▲４▼〜▲６▼と比較して、次のことが分かる。すなわち、本発明材▲１▼〜▲３▼は、圧延後のＵＴ（超音波探傷試験）の結果、未接合部が形成されず接合状態が良好である。圧延まま材及び固溶化熱処理材のせん断強さ共に、良好である。圧延まま材及び固溶化熱処理材の側曲げ試験の結果についても、はく離を生ずることなく良好である。
【００２０】
次に、第３，４図に示す犠牲板方式に係るクラッド鋼板の製造方法に使用する組合せ体に基づいて、本発明の第２実施の形態について説明する。但し、第１実施の形態と同一部分には同一符号を付してある。
【００２１】
この実施の形態にあつては、犠牲板１７を使用し、１枚の合せ材１０及び母材１１からなる重合板に対し、加熱圧延を行う。この合せ材１０の母材１１との合せ面側には、Ｃｕメッキ層１、Ｎｉメッキ層２の順に、２重メッキ層が第１実施の形態と同一厚さで形成されている。合せ材１０の合せ面と反対面は、犠牲板１７に対向させ、母材１１−合せ材１０−犠牲板１７の順に組合せる。合せ材１０と犠牲板１７との間の剥離面には、予め、分離剤Ｓを塗布し、乾燥させる。更に、母材１１と犠牲板１７との間に通気孔１４を有する接合板１５を溶接固定する。
【００２２】
このような組合せ体は、必要に応じて真空処理を施し、第１実施の形態と同様の圧延温度（７５０〜８３０℃）にまで加熱し、その後圧延機によつて所定の圧延比にて圧延し、合せ材１０と母材１１とを２重メッキ層を介して接合させる。圧延後には、接合板１５付近となる母材１１及び犠牲板１７の周縁部を切断除去し、犠牲板１７を取り除いて１枚のクラッド鋼板を得る。クラッド鋼板には、必要に応じて７８０〜８２０℃で固溶化熱処理をする。
しかして、この実施の形態によつても、第１実施の形態と同様の作用を得ることができる。
【００２３】
【発明の効果】
以上の説明によつて理解されるように、本発明によれば、長期の防汚機能に優れるＢｅＣｕ合金クラッド鋼板が提供される。また、このＢｅＣｕ合金クラッド鋼板は、高い接合強度が得られ、剥離が発生し難いと共に、曲げ延性が良好であることもあつて、加工性に優れる。加えて、実用上の接合強度を確保しながら、固溶化熱処理を施し、硬化させることも可能である。
【図面の簡単な説明】
【図１】本発明の第１実施の形態に係る組合せ体を示す断面図。
【図２】図１のＩＩ−ＩＩ線断面図。
【図３】本発明の第２実施の形態に係る組合せ体を示す断面図。
【図４】図３のＩＶ−ＩＶ線断面図。
【符号の説明】
１：Ｃｕメッキ層、２：Ｎｉメッキ層、１０：合せ材、１１：母材、１５：接合板、１７：犠牲板、Ｓ：分離剤。[0001]
[Industrial applications]
The present invention relates to a BeCu alloy clad steel sheet and a method for manufacturing the same.
[0002]
[Prior art and its problems]
BACKGROUND ART Conventionally, antifouling measures such as painting have been applied to seawater pipes of power plants, desalination plants, and the like in order to prevent power generation troubles and equipment troubles due to the attachment of marine organisms. However, antifouling measures such as painting have problems such as maintenance work, treatment of adhered substances, pollution and the environment.
Therefore, there has been proposed a clad steel plate in which, for example, a Cu—Ni alloy (cupronickel) is used as a bonding material, steel is used as a base material, and the bonding material and the base material are joined to take antifouling measures.
[0003]
However, such a conventional clad steel sheet has a relatively short-term effect of preventing marine organisms from adhering.However, the long-term effect of the clad steel sheet decreases its sustainability and impairs the antifouling property. Cleaning was needed.
[0004]
For this reason, the present inventors have conducted various studies on clad steel sheets having excellent antifouling properties to which marine organisms do not adhere without using a Cu-Ni alloy. They have found that BeCu alloy, which is widely applied to safety tools, connectors, relay contacts, submarine communication repeaters, etc., which does not emit sparks due to impact, is promising as a long-term antifouling material.
However, in the case of a BeCu alloy clad steel sheet, an intermetallic compound of Be and Ni is easily generated only by applying Ni plating, which is known to prevent the bonding surface of the joining material from being oxidized during the production of the clad steel sheet. Furthermore, when a base material that requires heat treatment such as normalization is used depending on the use of the clad steel sheet, the heat treatment causes fragile intermetallic compounds to grow, lowering the bonding strength and withstanding practical use. There is a technical problem of disappearing.
[0005]
[Means for Solving the Problems]
The present invention has been made in view of such a conventional technical problem, and has the following configuration.
According to the first aspect of the present invention, a BeCu alloy containing 0.5 to 2.0% by weight of Be is used as the composite material 10, and a base material 11 made of carbon steel or low alloy steel is joined to the mating surface of the composite material 10. BeCu alloy clad steel sheet, characterized in that a Cu plating layer 1 and a Ni plating layer 2 are formed in this order on the mating surface of the joining material 10 and a double plating layer is formed. .
The BeCu alloy in which BeCu alloy containing 0.5 to 2.0% by weight of Be is used as the composite material 10 and the base material 11 made of carbon steel or low alloy steel is joined to the mating surface side of the composite material 10 A method for manufacturing an alloy-clad steel sheet, comprising forming a Cu plating layer 1 with a thickness of 100 to 500 μm on a mating surface of a joining material 10, and forming a Ni plating with a thickness of 20 to 100 μm on the Cu plating layer 1. After the plating layer 2 is formed, the Ni-plated layer 2 of the composite material 10 and the base material 11 are joined together by heating and rolling at a temperature of 750 to 830 ° C., and then 780 if necessary. A method for producing a BeCu alloy-clad steel sheet, comprising performing a solution heat treatment at a temperature of up to 820 ° C.
[0006]
[Action]
According to the first aspect of the invention, the long-term antifouling material can be obtained because the composite material 10 is made of a BeCu alloy. Further, since the composite material 10 is a BeCu alloy containing 0.5 to 2.0% by weight of Be, a strong oxide film is formed, the corrosion resistance is excellent, the hot workability is good, and the crack is prevented. it can. Further, since the Cu plating layer 1 and the Ni plating layer 2 are formed on the mating surface of the joining material 10 in the order of the double plating layer, diffusion of Be in the joining material 10 by the Cu plating layer 1 is prevented. The formation of a hard and brittle intermetallic compound phase between the Ni plating layer 2 and Be can be effectively prevented, and at the same time, the oxidation of the Cu plating layer 1 is prevented by the Ni plating layer 2.
[0007]
According to the second aspect, the same operation as the first aspect is obtained, and the following operation is obtained. That is, since the Cu plating layer 1 formed on the mating surface of the joining material 10 has a thickness of 100 to 500 μm, Be in the joining material 10 is plated with Cu during the rolling and heating while suppressing useless plating work. Diffusion penetrates through the layer 1 and reacts with the Ni plating layer 2 to form a brittle intermetallic compound, whereby the deterioration of the bondability is well prevented. In addition, since the Ni plating layer 2 formed on the Cu plating layer 1 has a thickness of 20 to 100 μm, the oxidation of the Cu plating layer 1 is favorably prevented.
[0008]
Furthermore, since the Ni-plated layer 2 of the joining material 10 and the base material 11 are joined together by hot rolling at a temperature of 750 to 830 ° C. which is lower than the melting temperature, a predetermined clad ratio can be easily obtained. In addition, the crystal grains of the BeCu alloy forming the composite material 10 are coarsened, and the occurrence of surface roughening after rolling is well prevented. If the BeCu alloy clad steel sheet needs to be subjected to a solution heat treatment and hardened, it is processed at a temperature of 780 to 820 ° C.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A first embodiment of the present invention will be described based on a combination used in the method for manufacturing a clad steel sheet according to the sandwich system shown in FIGS.
[0010]
In the drawing, reference numeral 10 denotes a composite material, and the composite material 10 is made of a soft material having corrosion resistance, specifically, a BeCu alloy containing 0.5 to 2.0% by weight of Be. On the mating surface side of this mating material 10, a double plating layer composed of a Cu plating layer 1 and a Ni plating layer 2 is formed in advance. The Cu plating layer 1 is formed directly on the mating surface of the joining material 10, and the Ni plating layer 2 is formed on the Cu plating layer 1.
[0011]
Here, the thickness of the Cu plating layer 1 is 100 to 500 μm, and the thickness of the Ni plating layer 2 is 20 to 100 μm. If it is only to prevent the bonding surface of the composite material 10 from being oxidized at the time of rolling and heating, Ni plating may be directly applied to the mating surface of the composite material 10 to prevent interfacial oxidation. However, since the Ni plating used to prevent interfacial oxidation during the cladding and Be in the composite material 10 form a hard and brittle intermetallic compound phase, a buffer layer is required. Therefore, it has been found that if Cu mating is applied to the mating surface of the joining material 10, the diffusion of Be in the joining material 10 can be suppressed, and the generation of an intermetallic compound can be favorably prevented. Therefore, on the mating surface of the joining material 10, the Ni plating layer 2 is formed on the Cu plating layer 1 to prevent the oxidation of the Cu plating layer 1 while suppressing the diffusion of Be.
[0012]
When the thickness of the Cu plating layer 1 is 100 μm or less, Be in the composite material 10 diffuses and penetrates the Cu plating layer 1 during rolling and heating, and reacts with the Ni plating layer 2 to form the above-mentioned intermetallic compound. descend. On the other hand, if the thickness of the Cu plating layer 1 is 500 μm or more, the thickness of the Cu plating layer 1 becomes excessively large for suppressing the diffusion of Be, and the plating operation is wasted. Therefore, the thickness of the Cu plating layer 1 is set to 100 to 500 μm. The Ni plating layer 2 has a thickness of 20 to 100 μm for the purpose of preventing interface oxidation. Further, if the content of Be in the composite material 10 is 0.5% by weight or less, a strong oxide film is hardly formed and the corrosion resistance is deteriorated. On the other hand, if the content is 2.0% by weight or more, hot working is performed. And the cracks are likely to occur. Therefore, the composite material 10 is a BeCu alloy (Beryllium-copper alloy) containing 0.5 to 2.0% by weight of Be.
[0013]
Reference numeral 11 denotes a base material, which is made of carbon steel or low alloy steel which is a practical steel. Two sets of superposed boards in which the base material 11 and the Ni (nickel) plating layer 2 of the composite material 10 are in close contact with each other are prepared, and the composite materials 10 are opposed to each other with the respective composite materials 10 inside and combined in a sandwich shape. A separating agent S is applied between the joining materials 10 in advance, and the separating agent S is sufficiently dried before being combined in a sandwich shape.
[0014]
Next, a joining plate 15 having a vent hole 14 between the base materials 11 is fixed by welding. Specifically, a joining plate 15 is welded and fixed between the

base materials

11 and 11 so as to surround four circumferences of the joining

materials

10 and 10, and is divided around the joining

materials

10 and 10 by the joining plate 15. A space 16 communicating with the outside air is formed by the ventilation hole 14. The combination is subjected to a vacuum treatment through the air holes 14, and the air holes 14 are closed by means such as welding. Note that this vacuum processing step can be omitted depending on the type of the separating agent S.
[0015]
The combination thus manufactured is heated to a temperature below the melting temperature, specifically, a rolling temperature in the range of 750 to 830 ° C. The combined body heated to a predetermined temperature is rolled by a rolling mill (not shown) at a predetermined rolling ratio, and the combined material 10 and the base material 11 of each combined body are joined. After the rolling, the periphery of the base material 11 near the joining plate 15 is cut and removed to obtain two clad steel plates. Due to the function of the separating agent S, the peeled surface between the bonding materials 10 can be easily separated.
[0016]
When the hot rolling temperature is lower than 750 ° C., the hot deformability of the base material 11 is significantly reduced, and it is difficult to obtain a predetermined clad ratio (plate thickness ratio). On the other hand, when the hot rolling temperature exceeds 830 ° C., the crystal grains of the BeCu alloy forming the composite material 10 become coarse, and after rolling, the surface becomes rough.
After the two clad steel sheets are obtained in this way, a solution heat treatment is performed at 780 to 820 ° C., if necessary, to be cured.
[0017]
Table 1 shows the UT (ultrasonic flaw test) after rolling with respect to the inventive materials (1) to (3) and the comparative materials (4) to (6) in which the types and thicknesses of the plating layers 1 and 2 were different. ), The results of the shear strength test (N / mm ² ) and the side bending test (2TR) of the as-rolled material and the solution heat treated material. The standard of the shear strength test is JIS G3604> 98 N / mm ² . The base material 11 is SM400A (37 mm [t] x 130 mm [w] x 180 mm [L]), and the composite materials 10 and 10 (Be 2.0 wt%) are B3130C1720 (9 mm [t] x 120 mm [w]). × 170 mm [L]).
The rolling conditions are as follows.
Heating condition: 800 ° C x 3 hrs
Rolling ratio: 2.5
Reduction rate: 5 to 15% per pass
The solution heat treatment conditions were 800 ° C. × 30 min and air cooling.
[0018]
[Table 1]

[0019]
From Table 1, it can be seen that the present invention materials (1) to (3) are as follows as compared with the comparative materials (4) to (6). That is, as a result of UT (ultrasonic test) after rolling, the unbonded portions are not formed and the bonded materials of the materials (1) to (3) of the present invention are good. Both the as-rolled material and the solution heat treated material have good shear strength. The results of the side bending test of the as-rolled material and the solution heat treated material are good without peeling.
[0020]
Next, a second embodiment of the present invention will be described based on the combination used in the method for manufacturing a clad steel sheet according to the sacrificial plate system shown in FIGS. However, the same parts as those in the first embodiment are denoted by the same reference numerals.
[0021]
In this embodiment, the sacrificial plate 17 is used, and the superposed plate composed of one piece of the composite material 10 and the base material 11 is heated and rolled. On the mating surface of the joining material 10 with the base material 11, a double plating layer is formed in the order of Cu plating layer 1 and Ni plating layer 2 with the same thickness as in the first embodiment. The mating surface of the joining material 10 and the opposite surface are opposed to the sacrifice plate 17, and the base material 11, the joining material 10, and the sacrifice plate 17 are combined in this order. The separating agent S is applied in advance to the separation surface between the bonding material 10 and the sacrificial plate 17 and dried. Further, a joining plate 15 having a vent hole 14 between the base material 11 and the sacrificial plate 17 is fixed by welding.
[0022]
Such a combination is subjected to a vacuum treatment as necessary, heated to the same rolling temperature (750 to 830 ° C.) as in the first embodiment, and then rolled at a predetermined rolling ratio by a rolling mill. Then, the bonding material 10 and the base material 11 are joined via a double plating layer. After rolling, the peripheral portions of the base material 11 and the sacrifice plate 17 near the joining plate 15 are cut and removed, and the sacrifice plate 17 is removed to obtain one clad steel plate. The clad steel sheet is subjected to a solution heat treatment at 780 to 820 ° C. as necessary.
Thus, according to this embodiment, the same operation as that of the first embodiment can be obtained.
[0023]
【The invention's effect】
As understood from the above description, according to the present invention, a BeCu alloy clad steel sheet having an excellent long-term antifouling function is provided. Further, the BeCu alloy clad steel sheet is excellent in workability because high bonding strength is obtained, peeling is unlikely to occur and bending ductility is good. In addition, it is also possible to perform solution heat treatment and harden while ensuring practical bonding strength.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a combination according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a cross-sectional view showing a combination according to a second embodiment of the present invention.
FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;
[Explanation of symbols]
1: Cu plating layer, 2: Ni plating layer, 10: composite material, 11: base material, 15: joining plate, 17: sacrificial plate, S: separating agent.

Claims

A BeCu alloy containing 0.5 to 2.0% by weight of Be is used as a composite material (10), and a base material (11) made of carbon steel or low alloy steel is joined to a mating surface of the composite material (10). A BeCu alloy clad steel sheet, wherein a double plating layer is formed in the order of a Cu plating layer 1 and a Ni plating layer 2 on a joining surface of a joining material (10).

A BeCu alloy containing 0.5 to 2.0% by weight of Be is used as a composite material (10), and a base material (11) made of carbon steel or low alloy steel is joined to a mating surface of the composite material (10). A method for manufacturing a BeCu alloy-clad steel sheet, comprising forming a Cu plating layer (1) with a thickness of 100 to 500 μm on a mating surface of a mating material (10), and forming a copper plating layer on the Cu plating layer (1). After forming the Ni plating layer (2) with a thickness of １００100 μm, the Ni-plated layer (2) of the bonding material (10) and the base material (11) are superposed at a temperature of 750 to 830 ° C. A method for producing a BeCu alloy-clad steel sheet, comprising performing heat rolling and joining, and then performing a solution heat treatment at a temperature of 780 to 820 ° C. as necessary.