JPH08218144A - Aluminum alloy sheet for can end excellent in stress corrosion cracking resistance in score part - Google Patents
Aluminum alloy sheet for can end excellent in stress corrosion cracking resistance in score partInfo
- Publication number
- JPH08218144A JPH08218144A JP2522695A JP2522695A JPH08218144A JP H08218144 A JPH08218144 A JP H08218144A JP 2522695 A JP2522695 A JP 2522695A JP 2522695 A JP2522695 A JP 2522695A JP H08218144 A JPH08218144 A JP H08218144A
- Authority
- JP
- Japan
- Prior art keywords
- stress corrosion
- score
- corrosion cracking
- present
- hydrogen
- 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.)
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- Containers Opened By Tearing Frangible Portions (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ビール、炭酸飲料等の
容器に用いられるキャンエンド用Ａｌ合金板に係り、さ
らに詳細には、内容物充填、捲き締め後の内圧負荷状態
におけるスコア部の対応力腐食割れに優れたキャンエン
ド用Ａｌ合金板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy plate for can ends used in containers for beer, carbonated drinks, and the like, and more specifically, to a score part in an internal pressure loaded state after filling contents and winding. The present invention relates to an aluminum alloy plate for can ends which is excellent in corrosion cracking.
【０００２】[0002]
【従来の技術】環境問題の観点から、現在の金属缶容器
のキャンエンドの多くはプルタブがキャンエンドから離
れないステイオンタブ方式（ＳＯＴ）が採用されている
が、ＳＯＴ式のキャンエンドは、これまで主流であった
プルタブがキャンエンドから離れるリングプル方式（Ｒ
Ｐ）に比べ、開缶荷重が高いため、スコア加工後の残厚
を薄くし、開缶性の向上を図っている。しかしながら、
このスコア残厚の薄肉化により種々の問題が生じてい
る。2. Description of the Related Art From the viewpoint of environmental problems, most of the can ends of the present metal can containers adopt the Steion tab system (SOT) in which the pull tab does not separate from the can end. The ring pull method (R
Compared with P), since the can opening load is higher, the remaining thickness after the score processing is thinned to improve the can opening property. However,
Various problems are caused by the thinning of the remaining thickness of the score.
【０００３】その中でも、ＪＩＳ ５０８２、５１８２
等のＡｌ合金板を使用している炭酸飲料等の内圧の高い
陽圧缶エンドにおいて、保管時にスコア部が破断し、開
口部が破裂するという問題を生じている。このスコア部
の破断はＲＰ方式の場合でもごく稀に生じていたが、Ｓ
ＯＴ方式の導入によってその頻度は急激に増加してい
る。これら飲料缶は、内容物充填、捲き締め、缶洗浄後
にシュリンク包装等を施して倉庫等に保管されるが、高
温・多湿の保管状態では早くて一週間程で破裂を生ずる
ものがある。このスコアの破裂は、スコア部に内圧によ
る応力集中が生じ、タブの内側等に残留した洗浄液が腐
食液となりうることから応力腐食割れであるが、一般的
にＡｌ−Ｍｇ系合金で生じる応力腐食割れとは異なる形
態を示す。Among them, JIS 5082, 5182
In a positive pressure can end having a high internal pressure, such as a carbonated beverage using an Al alloy plate, there is a problem that the score part breaks during storage and the opening part bursts. This breakage of the score part occurred very rarely even in the case of the RP method, but S
With the introduction of the OT method, its frequency has increased rapidly. These beverage cans are stored in a warehouse or the like after being filled with contents, wrapped and shredded after washing the cans. However, some of them can burst in about one week at the earliest when stored at high temperature and high humidity. The rupture of this score is stress corrosion cracking because stress concentration due to internal pressure occurs in the score part and the cleaning liquid remaining inside the tab or the like can become a corrosive liquid, but stress corrosion generally occurs in Al-Mg alloys. It shows a different form from cracking.
【０００４】一般的なＡｌ−Ｍｇ系合金の応力腐食割れ
は、結晶粒界に析出した第２相であるβ相（Ａｌ3 Ｍｇ
2 ）が、電気化学的不均一性により優先的に溶解し、溶
解により生じた亀裂が伝播して破壊に到ることが知られ
ている。しかしながら、キャンエンドで生じているスコ
ア割れは、結晶粒界からの破壊を示しておらず、一般的
な応力腐食割れの事例とは合致しない。The stress corrosion cracking of a general Al-Mg alloy is the second phase β phase (Al 3 Mg) precipitated at the grain boundaries.
It is known that 2 ) is preferentially melted due to electrochemical non-uniformity, and cracks generated by the melting propagate and lead to destruction. However, the score cracking occurring at the can end does not show the fracture from the grain boundary, and does not match the case of general stress corrosion cracking.
【０００５】[0005]
【発明が解決しようとする課題】特開平５−３３１６０
５号公報（文献１）には、割れはスコア加工による剪断
帯に沿って生じるため、Ｍｇ量を規制することにより、
結晶粒内、粒界を問わずβ相を低減し、スコア割れを低
減させることを述べている。この文献１では基本的にβ
相の溶解を抑制することを目的としているが、実際のキ
ャンエンドでは結晶粒内、粒界ともほとんどβ相の析出
のないものでも割れを生じている。また、これらの破面
を観察すると明らかにβ相の溶解による破面とは異なる
形態を示している。したがって文献１に示すようなβ相
を抑制する従来技術ではスコア割れを防止するには充分
とはいえない。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In Japanese Patent Laid-Open No. 5 (Reference 1), since cracks occur along the shear band due to score processing, by controlling the amount of Mg,
It states that the β phase is reduced regardless of the grain boundaries and grain boundaries, and score cracking is reduced. In this document 1, basically β
The purpose is to suppress the dissolution of the phases, but in the actual can ends, cracks occur even in the crystal grains and grain boundaries where there is almost no precipitation of β phase. Moreover, when these fracture surfaces are observed, it clearly shows a morphology different from the fracture surface due to the dissolution of the β phase. Therefore, it cannot be said that the conventional technique for suppressing the β phase as shown in Document 1 is sufficient to prevent score cracking.
【０００６】キャンエンドのスコア部の応力腐食割れの
原因について米国の文献「ＢＬＯＷＯＵＴ ＯＦ ＡＬ
ＵＭＩＮＩＵＭ ＡＬＬＯＹ ５１８２ ＣＡＮ ＥＮ
ＤＳＣＡＵＳＥＤ ＢＹ ＴＲＡＮＳＧＲＡＮＵＬＡＲ
ＳＴＲＥＳＳ ＣＯＲＲＯＳＩＯＮ ＣＲＡＣＫＩＮ
Ｇ」［Ｔ．Ｄ．Ｂｕｒｌｅｉｇｈ，Ｅ．Ｈ．Ｇｉｌｌｅ
ｓｐｉｅ ａｎｄ Ｓ．Ｃ．Ｂｉｏｎｄｉｃｈ，Ａｌｕ
ｍｉｎｕｍ Ａｌｌｏｙｓ ｆｏｒ Ｐａｃｋａｇｉｎ
ｇ，Ｔｈｅ Ｍｉｎｅｒａｌｓ，Ｍｅｔａｌ＆Ｍａｔｅ
ｒｉａｌｓ Ｓｏｃｉｅｔｙ，１９９３］（文献２）で
は、タブ内側に残留する洗浄水から水素が発生して微小
欠陥の多いスコア部に吸着し、水素脆性割れを生じさせ
ると明記している。したがって残留する洗浄水の水分そ
のものが水素の発生を招くため、洗浄後の水分および保
管雰囲気中の水分除去が重要である。しかしながら、洗
浄時、保管時の飲料メーカーでのコストアップを招くと
ともに小売店ごとの保管条件を統一する必要があるた
め、完全に水分を除去することは困難である。Regarding the cause of stress corrosion cracking in the score part of the can end, US document "BLOWOUT OF AL"
UMINIUM ALLOY 5182 CAN EN
DSCAUSED BY TRANSGRANULAR
STRESS CORRECTION CRACKIN
G ”[T. D. Burleight, E .; H. Gille
spie and S. C. Biondich, Alu
minum Alloys for Packagin
g, The Minerals, Metal & Mate
Rials Society, 1993] (reference 2), it is specified that hydrogen is generated from the cleaning water remaining inside the tab and is adsorbed to the score portion having many fine defects to cause hydrogen brittle cracking. Therefore, the residual water content of the cleaning water itself causes generation of hydrogen, and it is important to remove the water content after cleaning and the water content in the storage atmosphere. However, it is difficult to completely remove water, since it causes an increase in cost at the beverage manufacturer during cleaning and storage and it is necessary to unify the storage conditions for each retail store.
【０００７】また、外的要因である洗浄水の影響の他
に、Ａｌ合金板中に含有される水素も洗浄水と同様の影
響を及ぼし、Ａｌ合金板中の水素含有量の低減が重要と
なってくる。これまで、Ａｌ合金板中の水素含有量の規
制については、特開平５−３２０８０８号公報（文献
３）に示されるように、絞りしごき加工（ＤＩ加工）用
のＡｌ合金板として提案されている。しかしながら文献
３はキャンボディ等に使用されるＤＩ加工用Ａｌ合金板
であり、成形性向上のため水素含有量を規制している
が、応力腐食割れ（水素脆性割れ）については一切述べ
られていない。また、文献３の実施例の耐力値と化学成
分を考慮すると、本発明の対象である高内圧の陽圧缶用
キャンエンドに必要な耐力を得ることは困難であるとと
もに、Ｍｎ量が比較的多いためにリベット成形時の割
れ、スコア加工による割れを招く可能性があり、キャン
エンドの特性を満足するものではない。本発明は、前記
した従来技術における問題点を解消し、前述した要望に
応えるべくなされたものであって、特にスコア部の対応
力腐食割れに優れたキャンエンド用Ａｌ合金板を提供す
ることを目的としている。[0007] Further, in addition to the influence of cleaning water, which is an external factor, hydrogen contained in the Al alloy plate has the same effect as cleaning water, and it is important to reduce the hydrogen content in the Al alloy plate. Is coming. Up to now, the regulation of the hydrogen content in the Al alloy plate has been proposed as an Al alloy plate for drawing and ironing (DI processing), as shown in JP-A-5-320808 (Reference 3). . However, Document 3 is an Al alloy plate for DI processing used for can bodies and the like, and regulates the hydrogen content to improve formability, but does not mention stress corrosion cracking (hydrogen embrittlement cracking) at all. . Further, considering the yield strength value and the chemical composition of the example of Document 3, it is difficult to obtain the yield strength required for the can end for a high internal pressure positive pressure can, which is the object of the present invention, and the Mn content is relatively high. Since there are many of them, there is a possibility of causing cracks at the time of rivet molding and cracks due to score processing, which does not satisfy the can end characteristics. The present invention has been made to solve the above-mentioned problems in the prior art and to meet the above-mentioned demand, and particularly to provide an Al alloy plate for can end which is excellent in the corresponding corrosion cracking of the score part. Has an aim.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明者等は鋭意研究を重ねた結果、Ａｌ合金板中
の水素含有量が少ないほどスコア割れの発生率が低減す
ることと、高内圧の陽圧缶用キャンエンドに必要な耐
力、成形性を考慮して化学成分を調整することにより所
期の目的達成が可能であることを知見し、本発明を完成
するに至った。前記知見に基づいてなされた本発明は、
重量％でＭｇ：３．００〜５．５０％、Ｍｎ：０．３５
〜０．６０％、Ｆｅ：０．１０〜０．６０％、Ｃｕ：
０．０３〜０．２０％、Ｓｉ：０．０５〜０．２５％を
含み、残部がＡｌおよび不可避不純物から構成され、ア
ルミニウム合金中の水素含有量が０．０８ｃｃ／１００
ｇ以下であることを特徴とするスコア部の対応力腐食割
れに優れたキャンエンド用Ａｌ合金板を要旨としてい
る。[Means for Solving the Problems] In order to achieve the above object, the inventors of the present invention have conducted extensive studies, and as a result, the lower the hydrogen content in the Al alloy plate, the lower the occurrence rate of score cracking. The inventors have found that the intended purpose can be achieved by adjusting the chemical composition in consideration of the yield strength and moldability required for a can end for a positive pressure can with high internal pressure, and have completed the present invention. The present invention made based on the above findings,
Mg: 3.00 to 5.50% by weight%, Mn: 0.35
~ 0.60%, Fe: 0.10 to 0.60%, Cu:
0.03 to 0.20%, Si: 0.05 to 0.25%, the balance consisting of Al and unavoidable impurities, and the hydrogen content in the aluminum alloy is 0.08 cc / 100.
The gist is an Al alloy plate for can ends, which is excellent in corrosion resistance cracking of the score portion, which is characterized by being g or less.
【０００９】[0009]
【作用】本発明の構成と作用を説明する。先ず、本発明
において使用されるＡｌ合金の化学成分を限定した理由
について説明する。 Ｍｇ： Ｍｇは強度を付与するために重要な元素であ
り、本発明では必須成分とするものである。炭酸飲料等
のキャンエンド材としては少なくとも３．００％以上添
加しないと十分な強度を得ることが出来ない。しかし過
剰に添加すると強度が高くなりすぎることによって成形
性の低下を招くため、添加量の上限は５．５０％であ
る。したがってＭｇの添加量は３．００〜５．５０％と
する。The structure and operation of the present invention will be described. First, the reason for limiting the chemical composition of the Al alloy used in the present invention will be described. Mg: Mg is an important element for imparting strength, and is an essential component in the present invention. As a can end material for carbonated drinks, sufficient strength cannot be obtained unless at least 3.00% is added. However, if added excessively, the strength becomes too high and the moldability is lowered, so the upper limit of the addition amount is 5.50%. Therefore, the addition amount of Mg is set to 3.00 to 5.50%.
【００１０】Ｍｎ： Ｍｎは強度を付与するために重要
な元素であり、開缶性の向上にも寄与するため本発明で
は必須成分とするものである。炭酸飲料等のキャンエン
ド材として十分な強度、開缶性を得るためには、少なく
とも０．３５％以上添加する必要がある。ただし過剰に
添加すると微細な晶出物の生成数が多くなり過ぎ、リベ
ット張り出し性、スコア加工性等の成形性が著しく低下
するため、上限は０．６０％とする。したがってＭｎの
添加量は０．３５〜０．６０％とする。Mn: Mn is an important element for imparting strength, and contributes to the improvement of can openability, so it is an essential component in the present invention. In order to obtain sufficient strength and can openability as a can end material for carbonated beverages, it is necessary to add at least 0.35% or more. However, if added excessively, the number of fine crystallized products will be too large, and the formability such as rivet overhangability and score workability will be significantly reduced, so the upper limit is made 0.60%. Therefore, the addition amount of Mn is set to 0.35 to 0.60%.
【００１１】Ｆｅ： Ｆｅの添加は、キャンエンド材と
して重要な特性である成形性を向上させる結晶粒微細化
に大きな効果を示すとともに、開缶性を改善するＡｌ−
Ｆｅ−Ｍｎ系晶出物の生成に効果を有するため、本発明
では必須成分とするものである。その添加量が多いほど
結晶粒微細化、開缶性は向上するものの、０．１０％未
満ではその効果が認められず、０．６０％を超える添加
は、巨大晶出物の生成および晶出物の生成数が多くなり
すぎて、リベット張り出し性、スコア加工性等の成形性
が著しく低下する。したがってＦｅの添加量は０．１０
〜０．６０％とする。Fe: The addition of Fe has a great effect on the refinement of crystal grains to improve the moldability, which is an important property as a can end material, and at the same time, to improve the can openability of Al-.
Since it has an effect on the formation of Fe-Mn-based crystallized substances, it is an essential component in the present invention. The larger the amount added, the finer the crystal grains and the better the can openability, but the effect is not observed at less than 0.10%, and the addition exceeding 0.60% results in the formation and crystallization of giant crystallized substances. The number of products produced becomes too large, and the formability such as rivet overhangability and score workability is remarkably reduced. Therefore, the amount of Fe added is 0.10.
~ 0.60%.
【００１２】Ｃｕ： Ｃｕの添加は強度向上に効果を示
すため、本発明では必須成分とするものである。０．０
３％未満では強度向上にほとんど寄与せず、０．３０％
を超える過多の添加では加工効果が大きくなるために強
度が高くなり過ぎ、成形性の低下を招く。したがってＣ
ｕの添加量は０．１０〜０．３０％とする。Cu: Since addition of Cu has an effect of improving strength, it is an essential component in the present invention. 0.0
If it is less than 3%, it hardly contributes to the strength improvement, and it is 0.30%.
If it is added in excess, the processing effect will be large and the strength will be too high, resulting in a decrease in moldability. Therefore C
The addition amount of u is 0.10 to 0.30%.
【００１３】Ｓｉ： Ｓｉの添加は、キャンエンド材と
して重要な特性である開缶性を向上させるＭｇ−Ｓｉ系
晶出物の生成および組織の安定化に効果を有するため、
本発明では必須成分とするものである。０．０５％未満
ではその効果が認められず、０．２５％を超えて過剰に
添加すると晶出物生成数が多くなりすぎて、成形性の低
下を招く。したがってＳｉの添加量は０．０５〜０．２
５％とする。その他、不純物としてはＺｒ、Ｚｎ、Ｔ
ｉ、Ｂ、Ｃｒ等が考えられるが、０．０５％以下であれ
ば本発明に重大な影響は与えない。Si: Since the addition of Si has the effect of stabilizing the structure and the formation of Mg-Si type crystallized substances that improve the can openability, which is an important property as a can end material,
In the present invention, it is an essential component. If it is less than 0.05%, the effect is not recognized, and if it exceeds 0.25% and is excessively added, the number of crystallized products is excessively increased, resulting in deterioration of formability. Therefore, the amount of Si added is 0.05 to 0.2.
5%. In addition, as impurities, Zr, Zn, T
Although i, B, Cr and the like are considered, if the content is 0.05% or less, the present invention is not seriously affected.
【００１４】さらに本発明ではＡｌ合金板中の水素含有
量を規制することにより、スコア部の応力腐食割れを抑
制することを重要なポイントとしている。スコア部の応
力腐食割れは水素量を低減すればするほど減少する。こ
れは、スコア割れメカニズムがアルミニウム合金中に存
在する水素を原因とする水素脆性であるためであり、、
この水素脆性を抑制するためにはアルミニウム合金中の
水素量を０．０８ｃｃ／１００ｇ以下とすることが好ま
しく、より好ましくは０．０６ｃｃ／１００ｇ以下であ
る。Further, in the present invention, it is an important point to suppress the stress corrosion cracking of the score portion by regulating the hydrogen content in the Al alloy plate. The stress corrosion cracking of the score portion decreases as the amount of hydrogen decreases. This is because the score cracking mechanism is hydrogen embrittlement due to the hydrogen present in the aluminum alloy,
In order to suppress this hydrogen embrittlement, the amount of hydrogen in the aluminum alloy is preferably 0.08 cc / 100 g or less, more preferably 0.06 cc / 100 g or less.
【００１５】[0015]
【実施例】本発明の実施例を説明するが、これによって
本発明はなんら限定されるものではない。 実施例 表１に示す化学成分を有するＡｌ合金の溶湯に脱ガスを
実施し、表２に示すそれぞれの水素量となった後、鋳造
を行なった。EXAMPLES Examples of the present invention will be described, but the present invention is not limited thereto. Example Degassing was performed on the molten metal of the Al alloy having the chemical composition shown in Table 1, and the casting was performed after the respective hydrogen contents shown in Table 2 were obtained.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【表２】 [Table 2]
【００１８】表２のＡ、Ｂの合金の脱ガスは、ポーラス
プラグを使用することにより水素量を低減させた。ま
た、Ｃの合金ではＳＮＩＦプロセスにより脱ガスを行な
った。鋳造後、鋳塊を均質化処理（５１０℃×４ｈｒ）
し、熱間圧延を施して３．００ｍｍの板厚とした後、中
間焼鈍工程を含む冷間圧延を施し、０．２６ｍｍの製品
板厚とした。その後リン酸クロメート処理（皮膜量３０
ｍｇ／ｄｍ2 ）を施し、エポキシ系塗料を塗布してＰ．
Ｍ．Ｔ２６０℃で焼付けを行なった後、キャンエンド加
工を行ない、応力腐食割れの試験、その他キャンエンド
特性、材料特性測定を実施した。その結果を表３および
表４に示した。なお、Ｐ．Ｍ．Ｔとは、Ａｌ板の最高到
達温度のことで焼き付け時にＡｌ板が加熱された温度で
ある。For degassing the alloys A and B in Table 2, the amount of hydrogen was reduced by using a porous plug. The alloy of C was degassed by the SNIF process. After casting, the ingot is homogenized (510 ° C x 4hr)
Then, after hot rolling to a plate thickness of 3.00 mm, cold rolling including an intermediate annealing step was performed to a product plate thickness of 0.26 mm. After that, phosphoric acid chromate treatment (coating amount 30
mg / dm @ 2) and apply an epoxy-based paint.
M. After baking at T260 ° C., can end processing was performed, stress corrosion cracking test, and other can end properties and material property measurements were performed. The results are shown in Tables 3 and 4. In addition, P. M. T is the highest temperature reached by the Al plate and is the temperature at which the Al plate was heated during baking.
【００１９】[0019]
【表３】 [Table 3]
【００２０】[0020]
【表４】 [Table 4]
【００２１】本発明例である表３および表４の１−Ａ〜
９−Ａおよび１−Ｂ〜３−Ｂは、従来例の水素含有量で
ある比較例１−Ｃ〜３−Ｃと比べ、材料特性、キャンエ
ンド特性は同等であるが、応力腐食によるスコア割れの
発生率が低くなっている。比較例の中には応力腐食割れ
の発生率を満足するものも認められるが（１０−Ａ、１
２−Ａ、１６−Ａは内圧によりキャンエンドが変形し、
測定不可能）、本発明の化学成分範囲外であるため、成
形性、耐圧強度、開缶性等のキャンエンド特性が充分で
ないため、炭酸飲料等の陽圧缶用キャンエンドに使用す
ることは困難である。1-A of Tables 3 and 4 which are examples of the present invention
9-A and 1-B to 3-B have the same material properties and can end properties as Comparative Example 1-C to 3-C, which is the hydrogen content of the conventional example, but score cracking due to stress corrosion. The incidence of is low. Although some of the comparative examples satisfy the rate of stress corrosion cracking (10-A, 1
In 2-A and 16-A, the can end is deformed by the internal pressure,
(Cannot be measured), since it is out of the chemical composition range of the present invention, the can end characteristics such as moldability, pressure strength, and can openability are not sufficient. Have difficulty.
【００２２】なお、キャンエンド特性は次のようにして
測定した。また、機械的性質は、通常の引張試験を行な
った。スコア部破断率は、キャンエンド成型後、クエン
酸水溶液（２．５％）＋炭酸水素ナトリウム（０．４ｇ
／１００ｃｃ）を充填して捲き締めし、内圧を３．０ｋ
ｇｆ／ｃｍ2 に調整した後イオン交換水をキャンエンド
外面に満たし、密閉したのち４０℃−ＲＨ８５％の雰囲
気下で２週間保管後の破断率を調査した。張出限界高さ
は、６ｍｍφの球頭ポンチによって張出測定をした。耐
圧強度は、水圧により缶内に圧力をかけ、キャンエンド
がバックリングした圧力を測定した。開缶荷重は、スコ
ア開缶開始時の荷重ＰＯＰと、開缶中の最大荷重ＴＥＡ
Ｒを測定した。The can end characteristics were measured as follows. For the mechanical properties, a normal tensile test was performed. The breakage rate of the score part is the citric acid aqueous solution (2.5%) + sodium hydrogen carbonate (0.4 g
/ 100cc) and wrap it up to 3.0k
After adjusting to gf / cm 2 , the outer surface of the can end was filled with ion-exchanged water and sealed, and then the fracture rate after storage for 2 weeks in an atmosphere of 40 ° C.-RH85% was investigated. The overhang limit height was measured by a 6 mmφ ball head punch. The pressure resistance was measured by applying pressure to the can with water pressure and buckling the can end. The can open load is the load POP at the start of score open and the maximum load TEA during can open.
R was measured.
【００２３】[0023]
【発明の効果】本発明は以上説明したように構成されて
いるから、炭酸飲料等の比較的内圧の高い陽圧缶用キャ
ンエンド材において、スコア部の応力腐食割れによる破
裂の抑制に優れ、かつその他のキャンエンド特性を充分
に満足させることが可能であり、薄肉、高強度化にも充
分対応し、低コストで安定して製造できることが可能で
あり、産業上極めて有用である。Since the present invention is configured as described above, in a can end material for a positive pressure can having a relatively high internal pressure such as carbonated beverages, it is excellent in suppressing the rupture due to stress corrosion cracking of the score portion, In addition, other can end properties can be sufficiently satisfied, thin wall and high strength can be sufficiently coped with, and stable production at low cost can be achieved, which is extremely useful industrially.
【手続補正書】[Procedure amendment]
【提出日】平成７年３月１５日[Submission date] March 15, 1995
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】発明の名称[Name of item to be amended] Title of invention
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【発明の名称】 スコア部の耐応力腐食割れに優れたキ
ャンエンド用Ａｌ合金板Al alloy plate for [entitled] the can end having excellent stress corrosion cracking of the score portion
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Name of item to be amended] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【特許請求の範囲】[Claims]
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００１[Correction target item name] 0001
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００１】[0001]
【産業上の利用分野】本発明は、ビール、炭酸飲料等の
容器に用いられるキャンエンド用Ａｌ合金板に係り、さ
らに詳細には、内容物充填、捲き締め後の内圧負荷状態
におけるスコア部の耐応力腐食割れに優れたキャンエン
ド用Ａｌ合金板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy plate for can ends used in containers for beer, carbonated drinks, and the like, and more specifically, to a score part in an internal pressure loaded state after filling contents and winding. on Al alloy plate for better scan-end resistance to stress corrosion cracking.
【手続補正５】[Procedure Amendment 5]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００７[Correction target item name] 0007
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００７】また、外的要因である洗浄水の影響の他
に、Ａｌ合金板中に含有される水素も洗浄水と同様の影
響を及ぼし、Ａｌ合金板中の水素含有量の低減が重要と
なってくる。これまで、Ａｌ合金板中の水素含有量の規
制については、特開平５−３２０８０８号公報（文献
３）に示されるように、絞りしごき加工（ＤＩ加工）用
のＡｌ合金板として提案されている。しかしながら文献
３はキャンボディ等に使用されるＤＩ加工用Ａｌ合金板
であり、成形性向上のため水素含有量を規制している
が、応力腐食割れ（水素脆性割れ）については一切述べ
られていない。また、文献３の実施例の耐力値と化学成
分を考慮すると、本発明の対象である高内圧の陽圧缶用
キャンエンドに必要な耐力を得ることは困難であるとと
もに、Ｍｎ量が比較的多いためにリベット成形時の割
れ、スコア加工による割れを招く可能性があり、キャン
エンドの特性を満足するものではない。本発明は、前記
した従来技術における問題点を解消し、前述した要望に
応えるべくなされたものであって、特にスコア部の耐応
力腐食割れに優れたキャンエンド用Ａｌ合金板を提供す
ることを目的としている。[0007] Further, in addition to the influence of cleaning water, which is an external factor, hydrogen contained in the Al alloy plate has the same effect as cleaning water, and it is important to reduce the hydrogen content in the Al alloy plate. Is coming. Up to now, the regulation of the hydrogen content in the Al alloy plate has been proposed as an Al alloy plate for drawing and ironing (DI processing), as shown in JP-A-5-320808 (Reference 3). . However, Document 3 is an Al alloy plate for DI processing used for can bodies and the like, and regulates the hydrogen content to improve formability, but does not mention stress corrosion cracking (hydrogen embrittlement cracking) at all. . Further, considering the yield strength value and the chemical composition of the example of Document 3, it is difficult to obtain the yield strength required for the can end for a high internal pressure positive pressure can, which is the object of the present invention, and the Mn content is relatively high. Since there are many of them, there is a possibility of causing cracks at the time of rivet molding and cracks due to score processing, which does not satisfy the can end characteristics. The present invention is to solve the problems in the above-mentioned prior art, which has been made to meet the requirements described above, Al alloy plate for the can end, particularly excellent resistance to respond <br/> stress corrosion cracking of the score portion Is intended to provide.
【手続補正６】[Procedure correction 6]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００８[Correction target item name] 0008
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明者等は鋭意研究を重ねた結果、Ａｌ合金板中
の水素含有量が少ないほどスコア割れの発生率が低減す
ることと、高内圧の陽圧缶用キャンエンドに必要な耐
力、成形性を考慮して化学成分を調整することにより所
期の目的達成が可能であることを知見し、本発明を完成
するに至った。前記知見に基づいてなされた本発明は、
重量％でＭｇ：３．００〜５．５０％、Ｍｎ：０．３５
〜０．６０％、Ｆｅ：０．１０〜０．６０％、Ｃｕ：
０．０３〜０．２０％、Ｓｉ：０．０５〜０．２５％を
含み、残部がＡｌおよび不可避不純物から構成され、ア
ルミニウム合金中の水素含有量が０．０８ｃｃ／１００
ｇ以下であることを特徴とするスコア部の耐応力腐食割
れに優れたキャンエンド用Ａｌ合金板を要旨としてい
る。[Means for Solving the Problems] In order to achieve the above object, the inventors of the present invention have conducted extensive studies, and as a result, the lower the hydrogen content in the Al alloy plate, the lower the occurrence rate of score cracking. The inventors have found that the intended purpose can be achieved by adjusting the chemical composition in consideration of the yield strength and moldability required for a can end for a positive pressure can with high internal pressure, and have completed the present invention. The present invention made based on the above findings,
Mg: 3.00 to 5.50% by weight%, Mn: 0.35
~ 0.60%, Fe: 0.10 to 0.60%, Cu:
0.03 to 0.20%, Si: 0.05 to 0.25%, the balance consisting of Al and unavoidable impurities, and the hydrogen content in the aluminum alloy is 0.08 cc / 100.
are summarized as the can end for Al alloy plate having excellent stress corrosion cracking of the score portion, characterized in that g or less.
【手続補正７】[Procedure Amendment 7]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１２[Correction target item name] 0012
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１２】Ｃｕ： Ｃｕの添加は強度向上に効果を示
すため、本発明では必須成分とするものである。０．０
３％未満では強度向上にほとんど寄与せず、０．３０％
を超える過多の添加では加工硬化が大きくなるために強
度が高くなり過ぎ、成形性の低下を招く。したがってＣ
ｕの添加量は０．１０〜０．３０％とする。Cu: Since addition of Cu has an effect of improving strength, it is an essential component in the present invention. 0.0
If it is less than 3%, it hardly contributes to the strength improvement, and it is 0.30%.
If added in excess, the work hardening becomes large and the strength becomes too high, resulting in deterioration of moldability. Therefore C
The addition amount of u is 0.10 to 0.30%.
【手続補正８】[Procedure Amendment 8]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１４[Correction target item name] 0014
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１４】さらに本発明ではＡｌ合金板中の水素含有
量を規制することにより、スコア部の応力腐食割れを抑
制することを重要なポイントとしている。スコア部の応
力腐食割れは水素量を低減すればするほど減少する。こ
れは、スコア割れメカニズムがアルミニウム合金中に存
在する水素を原因とする水素脆性であるためであり、こ
の水素脆性を抑制するためにはアルミニウム合金中の水
素量を０．０８ｃｃ／１００ｇ以下とすることが好まし
く、より好ましくは０．０６ｃｃ／１００ｇ以下であ
る。Further, in the present invention, it is an important point to suppress the stress corrosion cracking of the score portion by regulating the hydrogen content in the Al alloy plate. The stress corrosion cracking of the score portion decreases as the amount of hydrogen decreases. This is because the score cracking mechanism is hydrogen embrittlement caused by hydrogen present in the aluminum alloy. In order to suppress this hydrogen embrittlement, the amount of hydrogen in the aluminum alloy is set to 0.08 cc. / 100 g or less, more preferably 0.06 cc / 100 g or less.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 稲葉 隆 栃木県真岡市鬼怒ケ丘15番地 株式会社神 戸製鋼所真岡製造所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Inaba 15 Kinugaoka, Moka City, Tochigi Prefecture Kamido Steel Works Co., Ltd. Moka Works
Claims (1)
Ｍｎ：０．３５〜０．６０％、Ｆｅ：０．１０〜０．６
０％、Ｃｕ：０．０３〜０．２０％、Ｓｉ：０．０５〜
０．２５％を含み、残部がＡｌおよび不可避不純物から
構成され、アルミニウム合金中の水素含有量が０．０８
ｃｃ／１００ｇ以下であることを特徴とするスコア部の
対応力腐食割れに優れたキャンエンド用Ａｌ合金板。1. Mg: 3.00 to 5.50% by weight,
Mn: 0.35 to 0.60%, Fe: 0.10 to 0.6
0%, Cu: 0.03 to 0.20%, Si: 0.05 to
0.25%, the balance is composed of Al and unavoidable impurities, and the hydrogen content in the aluminum alloy is 0.08.
Al alloy plate for can ends, which is excellent in corrosion resistance cracking of the score part, characterized in that it is cc / 100 g or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2522695A JPH08218144A (en) | 1995-02-14 | 1995-02-14 | Aluminum alloy sheet for can end excellent in stress corrosion cracking resistance in score part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2522695A JPH08218144A (en) | 1995-02-14 | 1995-02-14 | Aluminum alloy sheet for can end excellent in stress corrosion cracking resistance in score part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08218144A true JPH08218144A (en) | 1996-08-27 |
Family
ID=12160061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2522695A Withdrawn JPH08218144A (en) | 1995-02-14 | 1995-02-14 | Aluminum alloy sheet for can end excellent in stress corrosion cracking resistance in score part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08218144A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009504918A (en) * | 2005-08-16 | 2009-02-05 | アレリス、アルミナム、コブレンツ、ゲゼルシャフト、ミット、ベシュレンクテル、ハフツング | High strength weldable Al-Mg alloy |
| WO2012070391A1 (en) * | 2010-11-26 | 2012-05-31 | 住友軽金属工業株式会社 | Coated aluminum alloy sheet for pressurized-can lid and process for producing same |
| JP2014009398A (en) * | 2012-07-03 | 2014-01-20 | Uacj Corp | Al-Mg BASED ALLOY FOR HIGH PRESSURE HYDROGEN GAS VESSEL |
-
1995
- 1995-02-14 JP JP2522695A patent/JPH08218144A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009504918A (en) * | 2005-08-16 | 2009-02-05 | アレリス、アルミナム、コブレンツ、ゲゼルシャフト、ミット、ベシュレンクテル、ハフツング | High strength weldable Al-Mg alloy |
| WO2012070391A1 (en) * | 2010-11-26 | 2012-05-31 | 住友軽金属工業株式会社 | Coated aluminum alloy sheet for pressurized-can lid and process for producing same |
| JP2012112007A (en) * | 2010-11-26 | 2012-06-14 | Sumitomo Light Metal Ind Ltd | Aluminum alloy coated sheet for positive pressure can lid, and method for producing the same |
| JP2014009398A (en) * | 2012-07-03 | 2014-01-20 | Uacj Corp | Al-Mg BASED ALLOY FOR HIGH PRESSURE HYDROGEN GAS VESSEL |
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