JPH08218146A - Steel sheet for welded can excellent in flange workability and neck formability and production thereof - Google Patents
Steel sheet for welded can excellent in flange workability and neck formability and production thereofInfo
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- JPH08218146A JPH08218146A JP2054195A JP2054195A JPH08218146A JP H08218146 A JPH08218146 A JP H08218146A JP 2054195 A JP2054195 A JP 2054195A JP 2054195 A JP2054195 A JP 2054195A JP H08218146 A JPH08218146 A JP H08218146A
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、板取り性、フランジ加
工性、及びネック加工性に優れた溶接缶用鋼板及びその
製造法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel plate for a welded can which is excellent in stripping property, flange processability and neck processability, and a method for producing the same.
【０００２】[0002]
【従来の技術】従来から、製缶時における鋼板の接合
は、はんだ付け、樹脂接着、溶接などの方法で行われて
いるが、その中でも特に鋼板歩留り向上のため、接合代
を少なくできる溶接による方法が近年主流になってい
る。ところで、この溶接缶の製造工程において、溶接し
た缶胴に蓋をつけるためには、缶胴の両端部に直径方向
外側に向かって延出するフランジ部を形成する工程があ
り、これをフランジ加工と称している。このフランジ加
工の際、該フランジ部に缶内容物の漏れの原因となるフ
ランジ割れとよばれる欠陥が生じる場合がある。そし
て、フランジ割れを生じる原因としては、溶接による接
合不良、鋼板の介在物、溶接熱影響部（以下、ＨＡＺ部
という）の軟化、溶接物の硬化などがある。2. Description of the Related Art Conventionally, the joining of steel sheets during can making has been performed by methods such as soldering, resin bonding, and welding. Among them, welding is particularly effective for improving the yield of steel sheets. Methods have become mainstream in recent years. By the way, in the process of manufacturing the welded can, in order to put a lid on the welded can body, there is a step of forming flange portions extending outward in the diametrical direction at both ends of the can body. Is called. During this flanging, a defect called a flange crack that causes leakage of the contents of the can may occur in the flange portion. The causes of the flange crack include joint failure due to welding, inclusions in the steel sheet, softening of the heat affected zone (hereinafter referred to as HAZ portion), hardening of the welded material, and the like.
【０００３】一方、缶製造コストの低減の観点から、缶
用素材の板厚は薄くなる傾向にあり、板厚の薄肉化に伴
う缶強度の低下に対しては、特開昭５１−１３１４１３
号公報に開示された焼鈍後の２次冷延、いわゆるダブル
レデュース（以下ＤＲと称す）を施すことにより鋼板の
硬さを硬くして対処しているのが現状である。しかしな
がら、ＤＲ素材は、２次冷延時の圧延歪みに起因する鋼
板の加工性の劣化及びＨＡＺ部の軟化が著しく、溶接後
のフランジ加工時にフランジ割れを起こすことが多いと
いう欠点がある。また、最近では，鋼板の歩留り向上の
ため、鋼板の圧延方向が缶胴の軸方向に平行となるよう
な板取り方法（以下これをリバースグレーン法と称す
る）で製缶する方法が主流になりつつあるが、従来のＤ
Ｒ材では材質統制の異方性が大きく、特に圧延直角方向
の延性に乏しく硬質化しているため、溶接後フランジ割
れが多発するという問題もあった。さらに、缶蓋材のコ
スト低減を図り、缶胴両端部に口絞り加工（ネック加
工）を施して小径化した後に、フランジ加工、蓋取付を
行う場合が多くなっており、その際にもリバースグレー
ン法で製缶した場合は同上の理由により、ネックにしわ
が発生し易くなるという問題があった。On the other hand, from the viewpoint of reducing the cost of manufacturing cans, the plate thickness of the can material tends to be thin, and with respect to the decrease in can strength as the plate thickness becomes thinner, JP-A-51-131413 is used.
In the present situation, the secondary cold rolling after annealing disclosed in Japanese Patent Publication, so-called double reduce (hereinafter referred to as DR), is performed to increase the hardness of the steel sheet. However, the DR material has a drawback that the workability of the steel sheet is deteriorated and the HAZ portion is significantly softened due to rolling strain during secondary cold rolling, and often causes flange cracks during flange processing after welding. In addition, recently, in order to improve the yield of steel sheet, a method of making a can by a stripping method (hereinafter referred to as a reverse grain method) in which the rolling direction of the steel sheet is parallel to the axial direction of the can body has become mainstream. The conventional D
The R material has a large anisotropy in material control, and in particular, it has poor ductility in the direction perpendicular to the rolling and is hardened, so that there is a problem that flange cracks frequently occur after welding. In addition, in order to reduce the cost of the can lid material, it is often the case that flange processing and lid mounting are performed after narrowing the diameter by performing necking on both ends of the can body, and in that case also reverse. When the cans were produced by the grain method, there was a problem that wrinkles were likely to occur on the neck for the same reason.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記問題点
を解決し、従来の板取り方法（ノーマルグレーン）、リ
バースグレーン法のいずれの板取り方法でも製缶可能で
あり、フランジ割れ及びネックしわが発生せず、かつ溶
接缶として必要な缶強度を確保できるような溶接缶用鋼
板及びその製造方法を提供することを目的としている。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and can make cans by any of the conventional planing methods (normal grain) and reverse grain method, and can be used for flange cracking and necking. It is an object of the present invention to provide a steel plate for a welding can and a method for producing the same, in which wrinkles do not occur and the can strength required for a welding can is secured.
【０００５】[0005]
【課題を解決するための手段】発明者は、上記目的を達
成するために実験、研究を繰返した結果、リバースグレ
ーン法等のいずれの板取り方法でも製缶可能であり、フ
ランジ割れ及びネックしわを発生させないためには、Ｈ
ＡＺ部での軟化を抑え、かつ圧延直角方向の延性劣化、
硬質化を生じさせないことが重要であり、これには、特
にＣ量、Ｎｂ量の調整と、最適２次冷延圧下率を組み合
わせればよいことを発見した。As a result of repeated experiments and studies for achieving the above object, the inventor has found that it is possible to make cans by any of the plate removing methods such as the reverse grain method, flange cracking and neck wrinkling. In order not to generate
Suppresses softening in the AZ part and deteriorates ductility in the direction perpendicular to the rolling,
It has been found that it is important not to cause hardening, and it is necessary to combine the adjustment of the amounts of C and Nb with the optimum secondary cold rolling reduction ratio.
【０００６】本発明は、この知見に基づいてなされたも
のであり、Ｃ：０．００５０重量％以下、Ｓｉ：０．０
４重量％以下、Ｍｎ：０．１〜０．６重量％、Ｐ：０．
０２重量％以下、Ａｌ：０．０１〜０．１５重量％、
Ｎ：０．００５重量％以下、Ｎｂ：０．００２〜０．０
３重量％を含有し、残部がＦｅ及び不可避的不純物から
なることを特徴とするフランジ加工性及びネック成形性
に優れた溶接缶用鋼板である。また、本発明は、Ｃ：
０．００５０重量％以下、Ｓｉ：０．０４重量％以下、
Ｍｎ：０．１〜０．６重量％、Ｐ：０．０２重量％以
下、Ａｌ：０．０１〜０．１５重量％、Ｎ：０．００５
重量％以下、Ｎｂ：０．００２〜０．０３重量％を含有
し、残部がＦｅ及び不可避的不純物からなる鋼片を１１
５０℃〜１３００℃の温度に加熱した後、仕上圧延温度
を（Ａｒ3 変態点温度−３０℃）以上として熱間圧延を
行い、その後４５０〜７００℃の巻取り温度で巻取った
後、酸洗、次いで圧下率８０％以上で冷間圧延した後、
均熱温度を再結晶温度以上８００℃以下で連続焼鈍を行
い、その後、圧下率２０〜４０％の２次圧延を施すこと
を特徴とするフランジ加工性及びネック成形性に優れた
溶接缶用鋼板の製造方法である。The present invention was made on the basis of this finding. C: 0.0050% by weight or less, Si: 0.0
4% by weight or less, Mn: 0.1 to 0.6% by weight, P: 0.
02% by weight or less, Al: 0.01 to 0.15% by weight,
N: 0.005% by weight or less, Nb: 0.002-0.0
A steel plate for a welded can having excellent flange formability and neck formability, which is characterized by containing 3% by weight and the balance being Fe and inevitable impurities. The present invention also provides C:
0.0050 wt% or less, Si: 0.04 wt% or less,
Mn: 0.1 to 0.6% by weight, P: 0.02% by weight or less, Al: 0.01 to 0.15% by weight, N: 0.005
A steel slab containing not more than 10% by weight, Nb: 0.002 to 0.03% by weight, and the balance being Fe and inevitable impurities is 11
After heating to a temperature of 50 ° C. to 1300 ° C., hot rolling is performed at a finish rolling temperature of (Ar 3 transformation point temperature −30 ° C.) or higher, and then winding at a winding temperature of 450 to 700 ° C. After washing and then cold rolling at a rolling reduction of 80% or more,
A steel plate for a welded can excellent in flange formability and neck formability, which is characterized by performing continuous annealing at a soaking temperature of not lower than the recrystallization temperature and not higher than 800 ° C., and then performing secondary rolling with a reduction rate of 20 to 40%. Is a manufacturing method.
【０００７】[0007]
【作用】本発明では、Ｃ：０．００５０重量％以下、Ｓ
ｉ：０．０４重量％以下、Ｍｎ：０．１〜０．６重量
％、Ｐ：０．０２重量％以下、Ａｌ：０．０１〜０．１
５重量％、Ｎ：０．００５重量％以下、Ｎｂ：０．００
２〜０．０３重量％を含有し、残部がＦｅ及び不可避的
不純物からなることを特徴とするフランジ加工性及びネ
ック成形性に優れた溶接缶用鋼板としたので、従来の板
取り方法（ノーマルグレーン）及びリバースグレーン法
のいずれの板取り方法でも製缶可能であり、フランジ割
れ及びネックしわが発生せず、かつ溶接缶として必要な
缶強度を確保できるようになる。In the present invention, C: 0.0050% by weight or less, S
i: 0.04 wt% or less, Mn: 0.1 to 0.6 wt%, P: 0.02 wt% or less, Al: 0.01 to 0.1
5% by weight, N: 0.005% by weight or less, Nb: 0.00
Since it is a steel plate for a welded can having excellent flange formability and neck formability, which is characterized by containing 2 to 0.03% by weight, and the balance being Fe and unavoidable impurities, the conventional stripping method (normal It is possible to make a can by any of the plate removing methods such as the grain) and the reverse grain method, and it becomes possible to secure the required can strength as a welding can without causing flange cracks and neck wrinkles.
【０００８】また、本発明では、Ｃ：０．００５０重量
％以下、Ｓｉ：０．０４重量％以下、Ｍｎ：０．１〜
０．６重量％、Ｐ：０．０２重量％以下、Ａｌ：０．０
１〜０．１５重量％、Ｎ：０．００５重量％以下、Ｎ
ｂ：０．００２〜０．０３重量％を含有し、残部がＦｅ
及び不可避的不純物からなる鋼片を１１５０℃〜１３０
０℃の温度に加熱した後、仕上圧延温度を（Ａｒ3 変態
点温度−３０℃）以上として熱間圧延を行い、その後４
５０〜７００℃の巻取り温度で巻取った後、酸洗、次い
で圧下率８０％以上で冷間圧延した後、均熱温度を再結
晶温度以上８００℃以下で連続焼鈍を行い、その後、圧
下率２０〜４０％の２次圧延を施すフランジ加工性及び
ネック成形性に優れた溶接缶用鋼板の製造方法としたの
で、上記効果を有する鋼板が確実に製造できるようにな
る。以下、本発明の内容を説明する。In the present invention, C: 0.0050% by weight or less, Si: 0.04% by weight or less, Mn: 0.1
0.6% by weight, P: 0.02% by weight or less, Al: 0.0
1 to 0.15% by weight, N: 0.005% by weight or less, N
b: 0.002 to 0.03% by weight, with the balance being Fe
And a slab of unavoidable impurities at 1150 ° C to 130 ° C.
After heating to a temperature of 0 ° C., hot rolling is performed at a finish rolling temperature of (Ar 3 transformation point temperature −30 ° C.) or higher, and then 4
After winding at a coiling temperature of 50 to 700 ° C., pickling, and then cold rolling at a rolling reduction of 80% or more, continuous annealing is performed at a soaking temperature of 800 ° C. or more, and then rolling. Since the method for producing a steel plate for a welding can having excellent flange formability and neck formability in which secondary rolling with a rate of 20 to 40% is performed, a steel plate having the above effects can be reliably produced. The contents of the present invention will be described below.
【０００９】まず、本発明に係る溶接缶用鋼板の化学成
分の限定理由について説明する。 Ｃ：０．００５０重量％以下 本発明においてＣは非常に重要である。Ｃは、０．００
５０重量％を超えると２次圧延後の鋼板が硬質化し、フ
ランジ加工性、ネック加工性とも劣化するので、その上
限を０．００５０重量％とした。また、Ｃが極端に低い
場合には、必要な缶強度を確保するのに高圧下率の２次
圧延を施す必要があるが、その２次圧延の結果、圧延直
角方向の延性が特に劣化して、リバースグレーン法では
フランジ割れが多発するようになるので、０．００１０
重量％以上のＣを含有していることが望ましい。First, the reasons for limiting the chemical components of the steel plate for a welding can according to the present invention will be described. C: 0.0050% by weight or less C is very important in the present invention. C is 0.00
If it exceeds 50% by weight, the steel sheet after the secondary rolling becomes hard and the flange formability and neck formability are deteriorated, so the upper limit was made 0.0050% by weight. Further, when C is extremely low, it is necessary to carry out secondary rolling at a high pressure reduction rate in order to secure the required can strength, but as a result of the secondary rolling, ductility in the direction perpendicular to the rolling is particularly deteriorated. In the reverse grain method, flange cracks frequently occur, so 0.0010
It is desirable to contain C by weight or more.
【００１０】Ｓｉ：０．０４重量％以下 Ｓｉは、多量添加すると表面処理時の酸化増量が大きく
なり、長時間の加熱によりめっき層が剥離する等の問題
が生じてくるので、その上限を０．０４重量％とした。 Ｍｎ：０．１〜０．６重量％ Ｍｎは、Ｓによる熱間割れを防止する有効な元素であ
り、含有するＳ量に応じて添加する必要がある。その効
果を発揮するためには、少なくとも０．１重量％以上の
Ｍｎ添加が必要である。一方、Ｍｎを多量に添加する
と、鋼板を硬質化させ，フランジ加工性、ネック加工性
を劣化させるので，その上限を０．６重量％とした。Si: 0.04 wt% or less If Si is added in a large amount, the amount of increase in oxidation during surface treatment becomes large and problems such as peeling of the plating layer due to long-term heating occur, so the upper limit is 0. It was set to 0.04% by weight. Mn: 0.1 to 0.6 wt% Mn is an effective element that prevents hot cracking due to S, and needs to be added according to the amount of S contained. In order to exert the effect, it is necessary to add at least 0.1% by weight of Mn. On the other hand, if a large amount of Mn is added, the steel sheet is hardened and the flange formability and neck formability are deteriorated, so the upper limit was made 0.6 wt%.
【００１１】Ｐ：０．０２重量％以下 Ｐは、鋼を著しく硬質化させ、フランジ加工性やネック
加工性を劣化させると同時に、耐食性を著しく劣化させ
る元素であるので、その上限を０．０２重量％と抑え
た。 Ｓ：０．０１重量％以下 Ｓは、ぶりきの延性を減少させ、脆化や耐食性の劣化を
もたらす元素なので、その上限を０．０１重量％と抑え
た。P: 0.02% by weight or less P is an element which significantly hardens steel and deteriorates flange formability and neck formability, and at the same time, significantly deteriorates corrosion resistance, so its upper limit is 0.02. Reduced to wt%. S: 0.01 wt% or less Since S is an element that reduces the ductility of tinplate and causes embrittlement and deterioration of corrosion resistance, its upper limit was suppressed to 0.01 wt%.
【００１２】Ａｌ：０．０１〜０．１５重量％ Ａｌは、固溶ＮをＡｌＮとして析出させるのに必要な元
素であり、少なくとも０．００５重量％以上の添加が必
要である。しかし、過剰に添加するとコストの上昇、介
在物によるＤＷＩ加工性、フランジ加工性の劣化を招く
ので、その上限を０．１５重量％とする。Al: 0.01 to 0.15% by weight Al is an element necessary for precipitating solid solution N as AlN, and it is necessary to add at least 0.005% by weight. However, excessive addition causes a cost increase and deterioration of DWI workability and flange workability due to inclusions, so the upper limit is made 0.15% by weight.
【００１３】Ｎ：０．００５％以下 Ｎは、固溶状態で存在すると、鋼板を硬質化させフラン
ジ加工性やネック加工性を劣化させるので、その上限を
０．００５重量％に抑えた。 Ｎｂ：０．００２〜０．０３重量％ 本発明において素材中のＮｂは、以下に述べる理由から
極めて重要な添加元素である。N: 0.005% or less When N is present in a solid solution state, it hardens the steel sheet and deteriorates flange formability and neck formability, so the upper limit was limited to 0.005% by weight. Nb: 0.002 to 0.03 wt% In the present invention, Nb in the material is an extremely important additive element for the reason described below.
【００１４】即ち、Ｎｂは、炭化物形成元素であり、固
溶Ｃの残存量を少なくすることで、詳細な機構は不明で
あるが、２次圧延後の鋼板特性の異方性が少なく、圧延
直角方向の延性劣化及び加工硬化量を抑えることができ
るので、リバースグレーン法でもフランジ割れ、ネック
しわの発生が抑制できる。また、フランジ割れの原因の
１つにＨＡＺ部の著しい軟化が上げられるが、本発明者
らは，熱影響による素材の軟化は同一溶接条件下では主
として素材の再結晶温度に依存し、再結晶温度が低いほ
ど軟化しやすく、したがって、フランジ割れの発生率も
高くなることを発見した。そして、さらにＮｂが再結晶
温度の上昇に有効であることをも知見した。これらの効
果を発揮するには、Ｎｂは最低０．００２重量％以上が
必要である。一方、Ｎｂを過剰に添加すると、素材コス
トが高くなると同時に、再結晶温度の過剰な上昇により
連続焼鈍工程で操業上支障が生じるので、その上限を
０．０３重量％とした。That is, Nb is a carbide forming element, and the detailed mechanism is unknown by reducing the residual amount of solid solution C, but the anisotropy of the steel sheet properties after secondary rolling is small, Since it is possible to suppress the deterioration of ductility and the amount of work hardening in the perpendicular direction, it is possible to suppress the occurrence of flange cracks and neck wrinkles even in the reverse grain method. Further, one of the causes of flange cracking is remarkable softening of the HAZ part. However, the inventors of the present invention have found that the softening of the material due to the heat effect mainly depends on the recrystallization temperature of the material under the same welding conditions, and the recrystallization is caused. It was discovered that the lower the temperature, the easier it is to soften, and thus the higher the incidence of flange cracking. Further, they also found that Nb is effective for increasing the recrystallization temperature. In order to exert these effects, Nb must be at least 0.002% by weight or more. On the other hand, if Nb is excessively added, the material cost becomes high, and at the same time, the excessive increase in the recrystallization temperature causes a trouble in the operation in the continuous annealing step. Therefore, the upper limit was made 0.03% by weight.
【００１５】次に、本発明に係る製造方法における製造
条件の限定理由について説明する。 スラブ加熱温度：１１５０〜１３００℃ 連続鋳造後のスラブを熱延に先立って加熱する温度が１
１５０℃以下では、熱延において十分高い熱延仕上げ温
度を確保することは困難である。一方、加熱温度が１３
００℃を越えると、最終的に鋼板の表面性状が著しく劣
化するので、その上限を１３００℃とした。Next, the reasons for limiting the manufacturing conditions in the manufacturing method according to the present invention will be described. Slab heating temperature: 1150 to 1300 ° C. The temperature at which the slab after continuous casting is heated prior to hot rolling is 1
At 150 ° C or lower, it is difficult to secure a sufficiently high hot rolling finish temperature in hot rolling. On the other hand, the heating temperature is 13
If the temperature exceeds 00 ° C, the surface properties of the steel sheet will be significantly deteriorated in the end, so the upper limit was made 1300 ° C.
【００１６】仕上げ圧延温度：Ａｒ変態点−３０℃以上 仕上げ圧延温度は，冷間圧延、連続焼鈍後のｒ値に代表
される深絞り性を良好にするためには（Ａｒ3 変態点−
３０℃）以上とすることが望ましい。この温度を下回っ
た場合には，最終的な組織が粗粒化する傾向にあり、製
缶時に肌荒れが生じたり、深絞り加工性が劣化するの
で、２ピース缶用鋼板としては望ましくない。さらに、
これを下回るような低温での仕上げ圧延を行った場合に
は、リジング現象が発生し易くなることで、ユーザー使
用段階で外観不良が指摘される危険性が大きくなる。し
たがって、本発明では、仕上圧延温度は（Ａｒ3 変態点
−３０℃）以上とした。Finish rolling temperature: Ar transformation point −30 ° C. or higher In order to improve the deep drawability represented by the r value after cold rolling and continuous annealing, the finish rolling temperature (Ar 3 transformation point−
It is preferable that the temperature is 30 ° C. or higher. When the temperature is lower than this temperature, the final structure tends to be coarse-grained, resulting in rough skin during can making and deep drawability being deteriorated, which is not desirable as a steel plate for a two-piece can. further,
When finish rolling is performed at a temperature lower than this, the ridging phenomenon is likely to occur, which increases the risk that a defective appearance is pointed out at the stage of user use. Therefore, in the present invention, the finish rolling temperature is set to (Ar 3 transformation point −30 ° C.) or higher.
【００１７】巻取温度：４５０〜７００℃ 巻取温度は、低過ぎると熱延板の形状が劣化し、次工程
の酸洗、冷間圧延に支障をきたすので、その下限を４５
０℃とする。一方、逆に高くなりすぎると、熱延母板中
にカーバイトが凝集した組織が形成され、これが鋼板の
耐食性に悪影響を与える。また、鋼板表面に生じるスケ
ール厚の増大に伴い酸洗性が劣化するので、その上限を
７００℃とした。Winding temperature: 450 to 700 ° C. If the winding temperature is too low, the shape of the hot-rolled sheet deteriorates and the pickling and cold rolling in the next step are hindered. Therefore, the lower limit is 45.
Set to 0 ° C. On the other hand, if it is too high, on the other hand, a structure in which carbide is aggregated is formed in the hot-rolled base plate, which adversely affects the corrosion resistance of the steel plate. In addition, since the pickling property deteriorates as the scale thickness increases on the surface of the steel sheet, the upper limit was set to 700 ° C.
【００１８】冷間圧下率：８０％以上 冷間圧下率が８０％未満であると、十分な深絞り性が得
られないので下限を８０％としたが、本発明の容易極低
炭素を素材とした鋼板で、十分な深絞り性を得るために
は、８５〜９５％とするのが望ましい。 焼鈍温度：再結晶温度以上８００℃以下 未再結晶残存組織では、材質のばらつき及び製缶時の成
形性が劣化するので、再結晶温度以上での焼鈍が必要で
ある。一方、焼鈍温度を過剰に上げると、連続焼鈍時に
ヒートバックルや板破断等の欠陥を生じる危険性が増加
するのみならず、表面濃化の増大などで、表面処理性の
劣化につながり望ましくない。したがって、その上限を
８００℃とした。Cold reduction ratio: 80% or more If the cold reduction ratio is less than 80%, sufficient deep drawability cannot be obtained, so the lower limit was made 80%, but the easy ultra-low carbon of the present invention is used as a material. In order to obtain sufficient deep drawability with the steel sheet described above, it is desirable that the content be 85 to 95%. Annealing temperature: Recrystallization temperature or higher and 800 ° C. or lower In the unrecrystallized residual structure, variations in material and moldability during can manufacturing are deteriorated, so annealing at a recrystallization temperature or higher is necessary. On the other hand, if the annealing temperature is excessively increased, not only the risk of causing defects such as heat buckle and plate rupture during continuous annealing is increased, but also the surface concentration is increased and the surface treatment property is deteriorated, which is not desirable. Therefore, the upper limit is set to 800 ° C.
【００１９】焼鈍後の２次冷延の圧下率：２０〜４０％ 本発明において、２次冷延の圧下率は、以下の述べる理
由から重要である。溶接缶の胴部の耐圧強度（バネリン
グ強度）を確保するには、缶胴の軸と垂直の方向の降伏
強度ＹＳが６２ｋｍ／ｍｍ2 以上で鋼板硬さＨＲ３０Ｔ
が６８以上必要であると言われている。それを下回る場
合は、特にコーヒー缶のような陰圧缶に用いる際に、缶
の内圧と外圧の差により缶胴部が内側に座屈したり、外
からの応力により変形しやすくなるので、不良缶となる
危険性が高い。したがって、本発明のように比較的軟質
な極低炭素鋼を素材に用いる場合には、圧下率にして最
低２０％の２次冷延が必要である。Reduction ratio of secondary cold rolling after annealing: 20 to 40% In the present invention, the reduction ratio of secondary cold rolling is important for the following reasons. In order to secure the pressure resistance strength (spring ring strength) of the body of the welding can, the yield strength YS in the direction perpendicular to the axis of the can is 62 km / mm 2 or more and the steel plate hardness HR30T.
Is said to be required for 68 or more. If it is less than that, especially when used in a negative pressure can such as a coffee can, the body of the can is likely to buckle inward due to the difference between the internal pressure and the external pressure of the can, or it is easily deformed due to external stress. There is a high risk of becoming a can. Therefore, when using a relatively soft ultra-low carbon steel as a raw material as in the present invention, it is necessary to carry out secondary cold rolling with a reduction rate of at least 20%.
【００２０】一方で、２次冷延圧下率が４０％を越える
と、材質特性の異方性が大きくなり、リバースグレーン
法におけるフランジ加工性、ネック加工性が顕著に劣化
する。また、２次冷延による加工歪が大きくなりすぎる
と、溶接による歪の開放量が大きく、それに伴うＨＡＺ
部での軟化が著しくなるので，フランジ割れが発生し易
くなる。したがって、その上限を４０％とした。On the other hand, when the secondary cold rolling reduction exceeds 40%, the anisotropy of material properties becomes large, and the flange workability and neck workability in the reverse grain method are significantly deteriorated. Further, if the processing strain due to the secondary cold rolling becomes too large, the amount of strain released by welding becomes large, and the HAZ accompanying it
Flange cracking is more likely to occur because the softening of parts becomes significant. Therefore, the upper limit is set to 40%.
【００２１】[0021]
【実施例】以下に、本発明の実施例について説明する。
まず、表１に示す成分組成を含み、残部が実質的にＦｅ
からなる鋼を転炉で溶製し、この鋼スラブを表２に示す
条件で熱間圧延、冷間圧延、連続焼鈍、そして２次冷延
を行い、最終仕上板厚を０．１７ｍｍとした。そして、
ハロゲンタイプの電気錫めっきラインにて２５番相当の
錫めっきを連続的に施してぶりきに仕上げた。比較例と
して、同じ板厚に仕上げた従来鋼に対しても同様の錫め
っきを施し、以降の各種評価に供した。EXAMPLES Examples of the present invention will be described below.
First, the composition shown in Table 1 is included, and the balance is substantially Fe.
Steel was melted in a converter, and the steel slab was hot-rolled, cold-rolled, continuously annealed, and secondary cold-rolled under the conditions shown in Table 2 to give a final finished plate thickness of 0.17 mm. . And
No. 25 tin plating was continuously applied on a halogen type electric tin plating line to finish it in a tin plate. As a comparative example, the same tin plating was applied to the conventional steel finished to the same plate thickness and subjected to the following various evaluations.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】このようにして得られた錫めっき鋼板の硬
さＨＲ３０Ｔ、板圧延方向（Ｌ方向）と垂直方向（Ｃ方
向）の引張強度、再結晶温度、そして製缶後の評価とし
て、ＨＡＺ部の高度Ｈｖと母材高度Ｈｖの差、ネックし
わ発生率、フランジ割れ発生率の調査を行い、それらの
結果を表３、表４及び表５に示した。なお、ネックしわ
発生率の調査は、製缶機によるノーマルグレーン法及び
リバースグレーン法により市販１９０ｇ缶と同径の缶胴
部を成形した後に、実験室のネッカー（口絞り加工機）
により１段ネックを行った際のネックしわ発生の目視検
査により評価し、また、フランジ割れ発生率の調査は、
開口端部をトリム後、円錐台上のパンチを開口端に挿入
しながら、実缶のフランジ加工と同程度の加工率にいた
るまで開口端の径を広げる試験を行い、その際の割れの
発生率で評価した。The hardness HR30T of the tin-plated steel sheet thus obtained, the tensile strength in the sheet rolling direction (L direction) and the vertical direction (C direction), the recrystallization temperature, and the HAZ part were evaluated after the can making. The difference between the height Hv and the base material height Hv, the neck wrinkle occurrence rate, and the flange crack occurrence rate were investigated, and the results are shown in Tables 3, 4, and 5. In addition, the neck wrinkle occurrence rate was investigated by molding a can body having the same diameter as a commercially available 190 g can by a normal grain method and a reverse grain method using a can making machine, and then using a necker (narrowing machine) in a laboratory.
By the visual inspection of the neck wrinkle occurrence when performing a one-step neck by
After trimming the opening end, insert a punch on the truncated cone into the opening end, and perform a test to expand the diameter of the opening end to a processing rate equivalent to the flange processing of the actual can, and cracks occur at that time. The rate was evaluated.
【００２５】[0025]
【表３】 [Table 3]
【００２６】[0026]
【表４】 [Table 4]
【００２７】[0027]
【表５】 [Table 5]
【００２８】表３〜５から明らかなように、本発明の鋼
板は、硬さＨＲ３０Ｔが６８以上であり、Ｌ方向、Ｃ方
向の降伏強度がいずれも６２ｋｍ／ｍｍ2 以上持つた
め、板厚０．１７ｍｍまで薄肉化した場合でも十分な缶
体強度を確保できる。また、本発明鋼は、Ｎｂの添加に
より、従来鋼に比して、再結晶温度が高いこと、固溶Ｃ
の固定化による加工硬化量の低減、そして、溶接部にお
ける（溶接部と母材の硬度差Ｈｖ）が小さい等の理由に
より、ノーマルグレーン法、リバースグレーン法のいず
れを問わずフランジ割れは全く発生しなかった。また、
ネックしわも全く発生しなかった。As is clear from Tables 3 to 5, the steel sheet of the present invention has a hardness HR30T of 68 or more and a yield strength in the L direction and the C direction of 62 km / mm 2 or more. Even if the wall thickness is reduced to 0.17 mm, sufficient can strength can be secured. Further, the steel of the present invention has a higher recrystallization temperature than the conventional steel due to the addition of Nb, and solid solution C
Due to the reduction of work hardening amount due to the fixation of the steel and the small difference (hardness difference Hv between the weld and the base metal) at the weld, flange cracking occurs at all regardless of the normal grain method or the reverse grain method. I didn't. Also,
Neck wrinkles did not occur at all.
【００２９】一方、比較例としての従来鋼１９では、固
溶Ｃ量が多く鋼板自体が硬質であるためにネックしわが
発生したり、溶接後の焼付け硬化により溶接部で著しく
硬質化が起こってしまい、フランジ割れが発生してい
る。従来鋼２０、２１では（１）圧下率が高すぎる、
（２）再結晶温度が低い、等の理由によりネックしわ発
生率、フランジ割れ発生率共に高い。そして、従来鋼２
２は、ネックしわ発生率、フランジ割れ発生率共に比較
的良好であるが、ＤＲ圧下率が低いために十分な缶体強
度が得られていない。On the other hand, in the conventional steel 19 as a comparative example, since the amount of solid solution C is large and the steel plate itself is hard, neck wrinkles occur, and bake hardening after welding causes remarkable hardening in the welded portion. The flange has cracked. With conventional steels 20 and 21, (1) the rolling reduction is too high,
(2) Neck wrinkle occurrence rate and flange crack occurrence rate are both high because of the low recrystallization temperature. And conventional steel 2
In No. 2, the neck wrinkle occurrence rate and the flange crack occurrence rate are relatively good, but sufficient DR strength is not obtained because the DR reduction rate is low.
【００３０】なお、本実施例では、鋼板に錫めっきを施
したものについて述べたが、本発明は、テインフリー鋼
板、複合めっき鋼板などに適用しても良く、さらにめっ
きを施さない塗油鋼板に適用しても良い。In this embodiment, the steel sheet is tin-plated. However, the present invention may be applied to a tin-free steel sheet, a composite-plated steel sheet, and the like. May be applied to.
【００３１】[0031]
【発明の効果】以上述べたように、本発明により、従来
の板取り方法（リバースグレーン）だけではなく、鋼板
歩留りに優れるリバースグリーン法で板取り、製缶した
場合でも、ネックしわ及びフランジ割れの発生がなく、
十分な缶体強度を有する溶接缶用鋼板を提供できるよう
になった。As described above, according to the present invention, not only the conventional stripping method (reverse grain), but also the reverse green method, which is excellent in the yield of steel sheet, is used for stripping and canning. The occurrence of
It has become possible to provide a steel plate for a welding can having sufficient can strength.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 加藤 俊之 千葉市中央区川崎町１番地 川崎製鉄株式 会社技術研究所内 (72)発明者 久々湊 英雄 千葉市中央区川崎町１番地 川崎製鉄株式 会社千葉製鉄所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Kato 1 Kawasaki-cho, Chuo-ku, Chiba City Research Institute of Kawasaki Steel Co., Ltd. (72) Inventor Hideo Kuminato 1 Kawasaki-cho, Chuo-ku, Chiba Steel Co. In-house
Claims (2)
ｅ及び不可避的不純物からなることを特徴とするフラン
ジ加工性及びネック成形性に優れた溶接缶用鋼板。1. C: 0.0050% by weight or less, Si: 0.04% by weight or less, Mn: 0.1-0.6% by weight P: 0.02% by weight or less Al: 0.01-0. 15% by weight N: 0.005% by weight or less Nb: 0.002 to 0.03% by weight, with the balance being F
A steel plate for a welded can having excellent flange formability and neck formability, which is characterized by comprising e and unavoidable impurities.
ｅ及び不可避的不純物からなる鋼片を１１５０℃〜１３
００℃の温度に加熱した後、仕上圧延温度を（Ａｒ3 変
態点温度−３０℃）以上として熱間圧延を行い、その後
４５０〜７００℃の巻取り温度で巻取った後、酸洗、次
いで圧下率８０％以上で冷間圧延した後、均熱温度を再
結晶温度以上８００℃以下で連続焼鈍を行い、その後、
圧下率２０〜４０％の２次圧延を施すことを特徴とする
フランジ加工性及びネック成形性に優れた溶接缶用鋼板
の製造方法。2. C: 0.0050% by weight or less, Si: 0.04% by weight or less, Mn: 0.1-0.6% by weight P: 0.02% by weight or less Al: 0.01-0. 15% by weight N: 0.005% by weight or less Nb: 0.002 to 0.03% by weight, with the balance being F
1150 ° C. to 13 ° C. for a steel slab consisting of e and unavoidable impurities
After heating to a temperature of 00 ° C., hot rolling was performed with a finish rolling temperature (Ar 3 transformation point temperature −30 ° C.) or higher, followed by winding at a winding temperature of 450 to 700 ° C., pickling, and then After cold rolling at a rolling reduction of 80% or more, continuous annealing is performed at a soaking temperature of not less than the recrystallization temperature and not more than 800 ° C., and thereafter,
A method for producing a steel plate for a welded can having excellent flange formability and neck formability, which is characterized by performing a secondary rolling with a reduction rate of 20 to 40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2054195A JPH08218146A (en) | 1995-02-08 | 1995-02-08 | Steel sheet for welded can excellent in flange workability and neck formability and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2054195A JPH08218146A (en) | 1995-02-08 | 1995-02-08 | Steel sheet for welded can excellent in flange workability and neck formability and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08218146A true JPH08218146A (en) | 1996-08-27 |
Family
ID=12030023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2054195A Withdrawn JPH08218146A (en) | 1995-02-08 | 1995-02-08 | Steel sheet for welded can excellent in flange workability and neck formability and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08218146A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015224384A (en) * | 2014-05-30 | 2015-12-14 | Ｊｆｅスチール株式会社 | Steel sheet for crown cap, manufacturing method therefor and crown cap |
| JP2016130361A (en) * | 2015-01-09 | 2016-07-21 | Ｊｆｅスチール株式会社 | Steel sheet for can and method for manufacturing steel sheet for can |
| CN106029926A (en) * | 2014-02-25 | 2016-10-12 | 杰富意钢铁株式会社 | Steel plate for crown cap, method for manufacturing same, and crown cap |
| US10655199B2 (en) | 2015-02-26 | 2020-05-19 | Jfe Steel Corporation | Steel sheet for crown cap, method for manufacturing steel sheet for crown cap, and crown cap |
-
1995
- 1995-02-08 JP JP2054195A patent/JPH08218146A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106029926A (en) * | 2014-02-25 | 2016-10-12 | 杰富意钢铁株式会社 | Steel plate for crown cap, method for manufacturing same, and crown cap |
| JPWO2015129191A1 (en) * | 2014-02-25 | 2017-03-30 | Ｊｆｅスチール株式会社 | Crown steel plate, method for producing the same, and crown |
| JP2015224384A (en) * | 2014-05-30 | 2015-12-14 | Ｊｆｅスチール株式会社 | Steel sheet for crown cap, manufacturing method therefor and crown cap |
| JP2016130361A (en) * | 2015-01-09 | 2016-07-21 | Ｊｆｅスチール株式会社 | Steel sheet for can and method for manufacturing steel sheet for can |
| US10655199B2 (en) | 2015-02-26 | 2020-05-19 | Jfe Steel Corporation | Steel sheet for crown cap, method for manufacturing steel sheet for crown cap, and crown cap |
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