JP3534960B2 - Steel plate for welded can body having high yield strength and method for producing the same - Google Patents
Steel plate for welded can body having high yield strength and method for producing the sameInfo
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- JP3534960B2 JP3534960B2 JP28456596A JP28456596A JP3534960B2 JP 3534960 B2 JP3534960 B2 JP 3534960B2 JP 28456596 A JP28456596 A JP 28456596A JP 28456596 A JP28456596 A JP 28456596A JP 3534960 B2 JP3534960 B2 JP 3534960B2
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、缶胴部の降伏が高
く、かつ、ネック成形性およびフランジ成形性に優れた
溶接缶胴用鋼板およびその製造方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 body having a high yield of the can body and excellent neck formability and flange formability, and a method for producing the same.
【０００２】[0002]
【従来の技術】３ピース缶と称される天蓋、円筒状の
胴、底蓋からなる鋼製容器の成形法は、半田付け、樹脂
接着による方法および溶接による方法で行われている。
その中で、接合代が少なく素材歩留り向上に有利な溶接
による方法が近年の主流である。この溶接による胴成形
後、その両端の径を縮めるネックイン加工が行われ、フ
ランジ加工を施して天蓋、底蓋を捲き締めて３ピース溶
接缶が完成する。2. Description of the Related Art A steel container comprising a canopy called a three-piece can, a cylindrical body, and a bottom cover is formed by soldering, resin bonding, or welding.
Among them, a welding method, which has a small joining cost and is advantageous for improving the material yield, has been the mainstream in recent years. After forming the barrel by welding, neck-in processing is performed to reduce the diameter of both ends, and flange processing is performed to wind up the canopy and the bottom lid to complete a three-piece welded can.
【０００３】近年の製缶においては、省資源・コストダ
ウンの観点から３ピース溶接缶への素材使用量を削減す
る方向で製造法の変更が広がりつつあり、最近では鋼板
の板厚を薄くする（以下、薄手化と称す）方向にあるの
みならず製缶技術面からネックイン加工による缶径の小
径化、いわゆる縮径化も進められている。In recent years, in the production of cans, the production method is being changed to reduce the amount of materials used in the three-piece welded cans from the viewpoint of resource saving and cost reduction, and recently, the thickness of steel sheets has been reduced. Not only in the direction of (hereinafter, referred to as thinning), but also from the viewpoint of can manufacturing technology, the can diameter is reduced by neck-in processing, that is, so-called diameter reduction.
【０００４】この薄手化対応によって缶胴部の塑性変形
が容易に生じるため、素材の鋼板強度は薄手化にともな
い徐々に高くなっている。[0004] Since the can body portion is easily plastically deformed in response to the reduction in thickness, the strength of the steel sheet as a raw material gradually increases with the reduction in thickness.
【０００５】このような薄鋼板としては、特開昭５１−
１３１４１３号公報にみられるように、熱間圧延鋼板を
冷間圧延後、焼鈍し、調質圧延段階で再度冷間圧延を行
う２回冷延法（以下、２ＣＲ法、２ＣＲ鋼板と称す）に
より製造した鋼板、いわゆる２ＣＲ鋼板がある。As such a thin steel plate, Japanese Patent Laid-Open No. 51-
As can be seen in Japanese Patent No. 131413, by a two-time cold rolling method (hereinafter, referred to as a 2CR method and a 2CR steel sheet) in which a hot-rolled steel sheet is cold-rolled, annealed, and cold-rolled again in a temper rolling stage. There is a manufactured steel plate, a so-called 2CR steel plate.
【０００６】しかし、２ＣＲ鋼板は、２ＣＲ伸び率が高
いほど冷延蓄積歪みに起因する鋼板の加工性劣化、特に
ネックイン加工による缶端部の座屈しわや溶接部近傍の
熱影響部（以下ＨＡＺ部と称す）の軟化が著しく、フラ
ンジ加工においてＨＡＺ部へのフランジ加工歪みが集中
することに起因する局部的なくびれ（以下、ネッキング
と称す）やネッキングが長じてフランジ割れが生じやす
くなる欠点がある。However, the higher the 2CR elongation of the 2CR steel plate, the more deteriorated the workability of the steel plate due to cold rolling accumulated strain, particularly the buckling wrinkles at the can end due to neck-in processing and the heat-affected zone near the weld (hereinafter The HAZ portion is markedly softened, and local constriction (hereinafter referred to as necking) or necking due to the concentration of flanging strain on the HAZ portion during flanging becomes prone to flange cracking. There are drawbacks.
【０００７】[0007]
【発明が解決しようとする課題】そこで本発明は、溶接
缶用鋼板の薄手化において、従来２ＣＲ法による冷延蓄
積歪みを利用した溶接缶用鋼板にある上記のような欠点
をなくして、缶胴部の降伏強度が高く、ネックイン成形
性およびフランジ成形性の劣化がない溶接缶胴用鋼板お
よびその製造方法を提供することにある。SUMMARY OF THE INVENTION Therefore, the present invention eliminates the above-mentioned drawbacks of the conventional steel plate for welding cans utilizing cold rolling accumulated strain by the 2CR method in thinning the steel plate for welding cans, and the cans are eliminated. It is an object of the present invention to provide a steel plate for a welded can body, which has a high yield strength in the body portion and does not deteriorate in neck-in formability and flange formability, and a method for producing the same.
【０００８】[0008]
【課題を解決すべき手段】２ＣＲ強化法は、冷間圧延を
施すことで鋼板内に冷延歪みを蓄積し、結晶格子のすべ
りに制限を与えて外力に抗しうる強度を得るものであ
る。In the 2CR strengthening method, cold rolling is performed to accumulate cold rolling strain in the steel sheet and limit slip of the crystal lattice to obtain strength that can resist external force. .
【０００９】しかしながらこの方法では、鋼のフェライ
ト結晶格子が非常に多くのすべり面を持つ特性から、破
断に対する抵抗が強くなる反面、外力が加わると抵抗の
少ないすべり面から素材の変形（塑性変形）が容易に起
こる欠点がある。これは降伏点が消失することで弾性変
形域が縮小し、外力を塑性変形で吸収することに当た
り、引張り強度の増加ほど缶胴部が強化されないためと
考えられる。In this method, however, the ferrite crystal lattice of steel has a large number of slip planes, so that resistance to fracture increases, but deformation of the material (plastic deformation) occurs from the slip plane with little resistance when external force is applied. There is a drawback that can happen easily. It is considered that this is because the elastic deformation region is reduced due to the disappearance of the yield point, and the external force is absorbed by plastic deformation, and the can body is not strengthened as much as the tensile strength is increased.
【００１０】３ピース缶の缶胴部の強度は、缶胴部を圧
力容器内に入れ、外圧をかけて缶が変形したときの圧力
で評価する方法や缶胴側面を指で押さえつけた状態を装
置内でシミュレートして缶が凹んだときの荷重を評価す
る方法等があるが、いずれにしても缶に永久歪み（塑性
変形）が生じた荷重が缶強度になると考えられる。The strength of the can body of a three-piece can is evaluated by a method in which the can body is placed in a pressure vessel and external pressure is applied to deform the can, or the side of the can body is pressed with fingers. There are methods such as simulating in the device to evaluate the load when the can is dented, but in any case, the load that causes permanent strain (plastic deformation) in the can is considered to be the can strength.
【００１１】つまり弾性変形域を広げれば、溶接缶胴部
に高い強度が付与できることになるのである。一般に降
伏点の大きい鋼板は、弾性変形域が広い特徴がある。さ
らに歪み時効性が強くなると上降伏点が大きくなる傾向
にあり、弾性変形域を広げる場合は歪み時効性の利用が
有効である。That is, if the elastic deformation region is widened, high strength can be imparted to the body of the welding can. In general, a steel sheet having a high yield point is characterized by a wide elastic deformation range. Further, when the strain aging becomes stronger, the upper yield point tends to increase, and it is effective to use the strain aging when expanding the elastic deformation range.
【００１２】以上のことから、高強度材に歪み時効性を
持たせることに着眼した。即ち、一般に調質圧延の圧下
率が大きい高強度材の場合、歪み時効性は小さくなり消
失するが、この歪み時効性を残せれば弾性変形域の広い
高強度材が得られることになり、効果的に溶接缶胴部を
強化出来るのである。From the above, the inventors have focused on imparting strain aging to high strength materials. That is, in general, in the case of a high-strength material having a large rolling reduction in temper rolling, strain aging becomes small and disappears, but if this strain aging is left, a high-strength material with a wide elastic deformation range can be obtained, The body of the welding can can be effectively strengthened.
【００１３】本発明の具体的解決手段は以下の通りであ
る。
（１） 重量％で、
Ｃ：０．００５〜０．０５％、
ＡＬ：０．０８％以下、
Ｎ：０．０１２％以下
を含有し、かつ鋼板中に固溶するＣおよびＮの間に、５
０ｐｐｍ≦固溶Ｃ＋固溶Ｎなる関係を有し、さらに上降
伏点が４２ｋｇｆ／ｍｍ2以上であることを特徴とす
る、缶胴部の降伏強度が高く、かつネック成形性および
フランジ成形性に優れた溶接缶胴用鋼板。The specific means of solving the present invention is as follows. (1) By weight%, C: 0.005 to 0.05%, AL: 0.08% or less, N: 0.012% or less, and between C and N which form a solid solution in the steel sheet. 5,
0 ppm ≦ solid solution C + solid solution N, and the upper yield point is 42 kgf / mm 2 or more, the yield strength of the can body is high, and the neck formability and
Steel plate for welding can bodies with excellent flange formability .
【００１４】[0014]
【００１５】（２）上記（１）に記載の溶接缶用薄鋼板
において、鋼板中に固溶するＮ量が、５０ｐｐｍ≦固溶
Ｎの範囲で、かつ上降伏点が４２ｋｇｆ／ｍｍ2以上で
あることを特徴とする、缶胴部の降伏強度が高く、かつ
ネック成形性およびフランジ成形性に優れた溶接缶胴用
鋼板。( 2 ) In the thin steel plate for a welding can according to the above (1), the amount of N dissolved in the steel plate is in the range of 50 ppm ≦ dissolved N, and the upper yield point is 42 kgf / mm 2 or more. A steel plate for a welded can body, which is characterized by having a high yield strength in the can body portion and excellent neck formability and flange formability.
【００１６】（３）重量％で、
Ｃ：０．００５〜０．０５％、
ＡＬ：０．０８％以下、
Ｎ：０．０１２％以下
を含有する連続鋳造鋼片を素材とし、熱間圧延し、達続
焼鈍法を施した後、５％以上１５％未満の圧下率の調質
圧延を行い、鋼板中に固溶するＣおよびＮの間に、５０
ｐｐｍ≦固溶Ｃ＋固溶Ｎ、または５０ｐｐｍ≦固溶Ｎな
る関係を有し、さらに上降伏点が４２ｋｇｆ／ｍｍ2以
上であることを特徴とする、缶胴部の降伏強度が高く、
かつネック成形性およびフランジ成形性に優れた溶接缶
胴用鋼板の製造方法。( 3 ) Hot rolling using a continuously cast steel slab containing C: 0.005 to 0.05%, AL: 0.08% or less, and N: 0.012% or less by weight. Then, after subjecting to the continuous annealing method, temper rolling with a rolling reduction of 5% or more and less than 15% is performed, and between C and N which form a solid solution in the steel sheet,
The yield strength of the can body is high, which has a relationship of ppm ≦ solid solution C + solid solution N, or 50 ppm ≦ solid solution N, and an upper yield point of 42 kgf / mm 2 or more,
A method for producing a steel plate for a welding can body having excellent neck formability and flange formability.
【００１７】[0017]
【発明の実施の形態】本発明者らは、特に０．１９ｍｍ
未満の極薄溶接缶に要求される諸特性について種々研究
した結果、溶接の接合部やＨＡＺ部の健全性、およびネ
ックイン成形性等の製缶性、さらには内容物充填前後の
缶強度等の実用特性を総合すると、缶強度に関して板厚
効果が期待できない極薄溶接缶用鋼板には、冷延蓄積歪
みによる強度増よりは、侵入型固溶元素による歪み時効
性を利用する方が、容易な加工性と缶強度を両立させる
上で優れていることを新たに知見し、連続焼鈍による歪
み時効強化型素材を製造することで本発明の完成に至っ
た。DETAILED DESCRIPTION OF THE INVENTION The inventors have found that in particular 0.19 mm.
As a result of various researches on various properties required for ultra-thin welded cans of less than 50%, the soundness of welded joints and HAZ parts, and can-making properties such as neck-in formability, and can strength before and after filling contents To summarize the practical characteristics of, for ultra-thin steel plates for welded cans where the plate thickness effect cannot be expected with respect to can strength, it is better to use strain aging due to interstitial solid solution elements rather than strength increase due to cold rolling accumulated strain. The inventors have newly found that they are excellent in achieving both easy workability and can strength, and have completed the present invention by producing a strain-age strengthened material by continuous annealing.
【００１８】本発明者らは、連続焼鈍法による溶接缶用
鋼板の製缶工程での材料強度変化について検討した。The present inventors examined the change in material strength in the can manufacturing process of steel plates for welding cans by the continuous annealing method.
【００１９】図２は、溶接缶製造工程の加工履歴と缶胴
強度の変化を示す実験例に基づく図である。FIG. 2 is a diagram based on an experimental example showing changes in working history and can body strength in the welding can manufacturing process.
【００２０】図２に示すように、調質圧延での圧下率が
低く、かつ固溶元素の少ない従来鋼板（ａ）は、歪み時
効性が小さいことで塗装印刷時の加熱での強度増加はわ
ずかである。塗装後に溶接工程に移り、円筒成形前に溶
接機内にあるレベリング機構により曲げと曲げ戻し加工
を受けるが、降伏点はわずかに低下する程度である。As shown in FIG. 2, the conventional steel sheet (a), which has a low rolling reduction in temper rolling and a small amount of solid solution elements, has a low strain aging property, so that the strength increase by heating during coating printing does not increase. Few. After painting, the process moves to the welding process, where it is bent and unbent by the leveling mechanism in the welder before forming the cylinder, but the yield point is only slightly lowered.
【００２１】従って溶接直前の円筒成形性や溶接後のネ
ックイン加工性は、固溶元素が少なく軟質な鋼板特性か
ら良好であったが、製缶後の経時による歪み時効硬化が
小さいため缶胴部の強度が確保できない致命的問題があ
る。Therefore, the cylindrical formability immediately before welding and the neck-in workability after welding were good due to the characteristics of the soft steel sheet with few solid solution elements, but the strain age hardening after the can making was small and the can body was small. There is a fatal problem that the strength of the part cannot be secured.
【００２２】また、図２に示した固溶元素が少なく、か
つ調質圧延で圧下率の高い従来の高強度鋼板（ｂ）は、
製缶前の平板では冷延歪みの効果で引張り強度が高い
が、塗装印刷時の加熱での強度増加はわずかである。ま
た、溶接機内のレベリング機構の影響（以下、レベラー
効果と称す）も僅かで、高強度のまま溶接加工されるた
め円筒成形での加工不良や溶接ＨＡＺ部の軟化による割
れ、さらに溶接後のネックイン加工でのしわ発生などが
生じやすい。Further, the conventional high-strength steel plate (b) shown in FIG. 2 which has a small amount of solid solution elements and has a high reduction ratio in temper rolling is
The flat plate before can making has high tensile strength due to the effect of cold rolling strain, but the increase in strength due to heating during coating printing is slight. In addition, the effect of the leveling mechanism in the welder (hereinafter referred to as the leveler effect) is slight, and since welding is performed with high strength, processing defects in cylindrical forming, cracking due to softening of the weld HAZ part, and neck after welding Wrinkles are likely to occur during in-processing.
【００２３】従って、冷延歪みで高強度化した（ｂ）の
ような場合は、缶胴部の強度確保が容易な反面、製缶作
業が困難になり歩留が劣化するという弊害がある。Therefore, in the case of (b) in which the strength is increased by cold rolling strain, it is easy to secure the strength of the can body portion, but the can manufacturing work becomes difficult and the yield deteriorates.
【００２４】これに対して、図２に示した固溶元素が多
く、調質圧延率が（ｂ）よりも低い本発明鋼板（ｃ）
は、製缶工程において素材強度が大きく変化するという
従来製法材（ａ）、（ｂ）にない特徴がある。On the other hand, the steel sheet of the present invention (c) having many solid solution elements shown in FIG. 2 and having a temper rolling reduction lower than that of (b).
Has a characteristic that the material strength largely changes in the can manufacturing process, which is not present in the conventional manufacturing materials (a) and (b).
【００２５】まず、塗装印刷での熱処理で著しい歪み時
効硬化があり、ついで円筒成形前のレベリング機構によ
る曲げと曲げ戻し加工により著しい軟化が起きる特徴が
ある。First, there is a characteristic that there is a remarkable strain age hardening by the heat treatment in the coating printing, and then a remarkable softening occurs by bending and bending back by the leveling mechanism before the cylindrical forming.
【００２６】これは一般に、歪み時効性が強い材料は、
塗装印刷での加熱で著しい強度増加があるため、円筒成
形でのフォーミング不良や溶接後のネックイン加工性が
劣化するという考えが一面的なものである事を示してい
る。Generally, this is because a material having a strong strain aging property is
This indicates that the idea that forming defects in cylindrical molding and the neck-in processability after welding deteriorate is one-sided because the strength increases remarkably by heating during painting printing.
【００２７】つまり、レベリング直後であれば歪み時効
性がなくなって素材が軟化（降伏点が小さくなる現象）
しているのでフォーミング不良やネックイン加工不良の
弊害が生じない。That is, immediately after leveling, the strain aging is lost and the material is softened (a phenomenon that the yield point becomes small).
Therefore, there is no adverse effect of defective forming or defective neck-in processing.
【００２８】また鋼板に強い時効性があるとレベラー効
果による軟化程度は、鋼板（ａ）以上に良好であること
も確認された。これは、鋼板に強い時効性があると溶接
機内のレベラー効果がより大きく働き、軟化しやすくな
るものと考えられる。It was also confirmed that if the steel sheet has a strong aging property, the degree of softening due to the leveler effect is better than that of the steel sheet (a). This is considered to be because if the steel sheet has a strong aging property, the leveler effect in the welding machine works more greatly, and it becomes easier to soften.
【００２９】また、図２の経時変化（２４時間後）にあ
るように、強い時効性があるとネックイン加工後の常温
雰囲気で短時間に歪み時効硬化が起こり、缶胴部の強度
は塗装印刷の加熱処理後と同等レベルまで大きくなるこ
とも確認された。Further, as shown in the change with time (after 24 hours) in FIG. 2, when strong aging occurs, strain age hardening occurs in a short time in a normal temperature atmosphere after neck-in processing, and the strength of the can body is painted. It was also confirmed that the size increased to the same level as after the heat treatment of printing.
【００３０】従って、時効性の強い鋼板は、条件によっ
ては難加工性素材とならず、溶接機内のレベリング機構
を考慮すれば、缶の成形加工が容易にできるとともに、
製缶後の速やかな歪み時効硬化の利用によって高強度鋼
板（ｂ）と同等の強度が得られるので薄手化に極めて有
用な素材でなる。Therefore, a steel plate having a strong aging property does not become a difficult-to-work material depending on the conditions, and if the leveling mechanism in the welding machine is taken into consideration, the can can be easily formed and processed.
The strength equivalent to that of the high-strength steel plate (b) can be obtained by utilizing the rapid strain age hardening after the can making, so that it is a very useful material for thinning.
【００３１】以下、本発明を詳細に説明する。The present invention will be described in detail below.
【００３２】鋼成分について説明すると、Ｃ量が多い場
合には焼鈍板の結晶粒成長が抑制され、不均一な組織と
なり硬質で延性に乏しくなること、さらに結晶粒界に固
溶Ｃが速やかに折出して時効性が小さくなり、缶胴の強
度が充分得られない等の問題を生じるので、上限を０．
０５％とする。Explaining the steel composition, when the amount of C is large, the growth of crystal grains in the annealed sheet is suppressed, resulting in a non-uniform structure and being hard and poor in ductility. Since the aging property becomes small and the strength of the can body is not sufficiently obtained, the upper limit is set to 0.
05%.
【００３３】なお、一般的にＣ量が少ないほど素材の結
晶粒が粗大化して軟質となり、調質圧延率が高くなり、
冷延歪みの増加を招くので、５％〜１５％未満の低圧下
率で缶胴の強度が得られる最少のＣ量として、下限を
０．００５％とする。Generally, the smaller the amount of C, the coarser the crystal grains of the material become, and the higher the temper rolling rate becomes.
Since it causes an increase in cold rolling strain, the lower limit is made 0.005% as the minimum amount of C that can obtain the strength of the can body at a low pressure ratio of 5% to less than 15%.
【００３４】ＡＬ量は、固溶Ｎを確保するために少ない
ほど好ましい。ＡＬ量が、０．０８％を越えると、固溶
ＡＬによる組織の細粒化が起きて結晶粒界に固溶Ｃが速
やかに析出して時効性が小さくなり、加工歪みも蓄積し
やすくなってネックイン成形、フランジ成形を困難にす
るほか、ＡＬＮ析出が多くなり固溶Ｎ不足による缶胴の
強度不足が生じる。The AL amount is preferably as small as possible in order to secure the solid solution N. When the amount of AL exceeds 0.08%, the fine grain structure of the structure occurs due to the solid solution AL, the solid solution C is rapidly precipitated at the grain boundaries, the aging becomes small, and the working strain easily accumulates. In addition to making neck-in molding and flange molding difficult, the strength of the can body becomes insufficient due to insufficient ALN precipitation and insufficient solid solution N.
【００３５】Ｎ量は、固溶Ｎを確保し鋼板に時効性を付
与するため多い方が好ましいが、０．０１２％を越える
と微細なＡＬＮが析出して組織の細粒化が起き、結晶粒
界に固溶Ｃが速やかに析出して歪み時効性を小さくし缶
胴の強度不足が生じる。また、著しい硬質化によってネ
ックイン成形、フランジ成形が困難になる。The amount of N is preferably large in order to secure the solid solution N and impart the aging property to the steel sheet. However, if it exceeds 0.012%, fine ALN is precipitated and the structure becomes fine-grained, resulting in crystal. Solid solution C is rapidly precipitated at the grain boundaries to reduce strain aging, resulting in insufficient strength of the can body. Further, due to the significant hardening, neck-in molding and flange molding become difficult.
【００３６】固溶Ｃと固溶Ｎの合計が５０ｐｐｍ未満で
は、缶胴の強度を満足するほどの降伏点が得られないの
で、固溶Ｃと固溶Ｎの合計は５０ｐｐｍ以上が必要であ
る。If the total amount of solid solution C and solid solution N is less than 50 ppm, a yield point sufficient to satisfy the strength of the can body cannot be obtained. Therefore, the total amount of solid solution C and solid solution N must be 50 ppm or more. .
【００３７】一方、固溶Ｃと固溶Ｎが多すぎると著しい
硬質化によってネックイン成形、フランジ成形が困難に
なるので上限は２００ｐｐｍとすることが望ましい。On the other hand, if the amount of solid solution C and the amount of solid solution N are too large, it becomes difficult to perform neck-in molding and flange molding due to remarkable hardening, so the upper limit is preferably set to 200 ppm.
【００３８】また、板厚が０．１９ｍｍ以上で鋼板強度
が４２ｋｇｆ／ｍｍ2以上の従来鋼板では、板厚効果に
よって必要な溶接缶胴の強度を確保できるが、板厚が
０．１９ｍｍ未満の従来の薄鋼板では、鋼板強度が４２
ｋｇｆ／ｍｍ2以上でも溶接缶胴の強度が確保できな
い。従って、本発明の効果は板厚が０．１９ｍｍ未満の
鋼板において発揮される。In the case of a conventional steel plate having a plate thickness of 0.19 mm or more and a steel plate strength of 42 kgf / mm 2 or more, the necessary strength of the welding can body can be secured by the plate thickness effect, but the plate thickness is less than 0.19 mm. With conventional thin steel sheets, the steel sheet strength is 42
Even if it is more than kgf / mm 2, the strength of the welding can body cannot be secured. Therefore, the effect of the present invention is exerted on a steel plate having a plate thickness of less than 0.19 mm.
【００３９】本発明の溶接缶用鋼板の鋼成分としては、
重量％でＣ：０．００５〜０．０５％、ＡＬ：０．０８
％以下、Ｎ：０．０１２％以下を含有することが必要で
あるが、公知の溶接缶用鋼板中に一般的に含有される成
分元素を含有していても良い。例えば、Ｓｉ：０．０２
％以下、Ｍｎ：０．６％以下、Ｐ：０．０２％以下、
Ｓ：０．０５％以下、Ｃｒ：０．１０％以下、Ｃｕ：
０．２０％以下、Ｎｉ：０．１５％以下、Ｍｏ：０．０
５％以下、Ｂ：０．００２０％以下、Ｔｉ、Ｎｂ、Ｚ
ｒ、Ｖ等の１種または２種以上を０．３％以下、Ｃａ：
０．０１％以下等の成分元素を目的に応じて含有させる
ことができる。The steel composition of the steel plate for a welding can of the present invention is as follows:
C: 0.005-0.05% by weight%, AL: 0.08
% Or less, and N: 0.012% or less is necessary, but the constituent elements generally contained in known steel plates for welding cans may be contained. For example, Si: 0.02
% Or less, Mn: 0.6% or less, P: 0.02% or less,
S: 0.05% or less, Cr: 0.10% or less, Cu:
0.20% or less, Ni: 0.15% or less, Mo: 0.0
5% or less, B: 0.0020% or less, Ti, Nb, Z
0.3% or less of one or more of r, V, etc., Ca:
Ingredients such as 0.01% or less can be contained according to the purpose.
【００４０】[0040]
【実施例】以下、本発明の実施例を比較例と対比して説
明する。EXAMPLES Examples of the present invention will be described below in comparison with comparative examples.
【００４１】表１に示す成分の連続鋳造鋼片を素材と
し、熱間圧延し、達続焼鈍し、調質圧延を行った。調質
圧延後の板厚は０．１７ｍｍとした。Continuously cast steel slabs having the components shown in Table 1 were used as raw materials, hot-rolled, continuously annealed, and temper-rolled. The plate thickness after temper rolling was 0.17 mm.
【００４２】比較例には本発明と異なる条件および材質
実績の部分に下線をつけている。In the comparative example, the condition and material performance different from those of the present invention are underlined.
【００４３】鋼材の成分は、本発明例および比較例とも
本発明範囲内にある。固溶Ｃ量は、調質圧延後の板厚が
０．１７ｍｍと薄いため直接に固溶Ｃ量を測定できない
が、本発明例のＮｏ．１、２はＣ量が少ないことから、
固溶Ｃ量は３０ｐｐｍ以上で、分析した固溶Ｎ量を加え
ると、固溶元素量の合計は５０ｐｐｍ以上ある。The components of the steel material are within the scope of the present invention in both the examples of the present invention and the comparative examples. The amount of solute C cannot be directly measured because the plate thickness after temper rolling is as thin as 0.17 mm. Since 1 and 2 have a small amount of C,
The amount of solid solution C is 30 ppm or more , and when the analyzed amount of solid solution N is added, the total amount of solid solution elements is 50 ppm or more.
【００４４】また本発明例のＮｏ．３は、Ｃ量が多いの
で固溶Ｃ量は少ないが、固溶Ｎ量のみで９９ｐｐｍであ
るから、固溶Ｃ量に左右されずに固溶元素量の合計は５
０ｐｐｍ以上ある。従って、製缶後に自然時効にて本発
明材の缶胴強度は著しく強化されている。Further, in No. 1 of the present invention example. No. 3 had a large amount of C, so the amount of dissolved C was small, but the amount of dissolved N was 99 ppm.
Therefore, the total amount of solid solution elements is 5 regardless of the amount of solid solution C.
It is 0 ppm or more. Therefore, the can body strength of the material of the present invention is remarkably enhanced by natural aging after can making.
【００４５】比較例のＮｏ．４、６はイニシャルのＣ量
が多く、加えて過時効処理が施されており、固溶Ｃ量は
１０ｐｐｍ程度に減少した。またＮ量も少ないので、固
溶元素量の合計は５０ｐｐｍを越えない。No. of the comparative example. Nos. 4 and 6 had a large amount of initial C, and were additionally overaged, and the amount of solute C was reduced to about 10 ppm. Since the amount of N is small, the total amount of solid solution elements does not exceed 50 ppm.
【００４６】また、比較例のＮｏ．５は、調質圧延の圧
下率が４．０％と低いため、いずれの比較例も製缶後の
缶胴強度は低いままである。Further, in Comparative Example No. In No. 5, since the rolling reduction in temper rolling is as low as 4.0%, the can body strength after can making remains low in all Comparative Examples.
【００４７】図１は、溶接缶の実作業に沿って材質の変
化を時系列的に調査するため、各製缶工程で素材に施さ
れる加工を実験的にシミュレーションした要領を示す図
である。FIG. 1 is a diagram showing a procedure of experimentally simulating the processing performed on the material in each can making process in order to investigate the change of the material in time series along the actual work of the welding can. .
【００４８】ここで調圧板は、製缶前の鋼板の材質に相
当する。塗装、印刷は鋼板の材質変化が加熱によって生
じるため、一貫の塗装、印刷での加熱条件を２１０℃×
３０分とした。Here, the pressure regulating plate corresponds to the material of the steel plate before can making. For painting and printing, because the material change of the steel plate occurs due to heating, the heating conditions for consistent painting and printing are 210 ° C x
30 minutes.
【００４９】塗装後の鋼板は、溶接機内でレベリング機
構による曲げと曲げ戻し加工を受けるが、このレベリン
グ機構による歪み量を１．３％と想定して冷間圧延を行
った。The coated steel sheet was bent and unbent by a leveling mechanism in a welding machine, and cold rolling was performed on the assumption that the distortion amount by the leveling mechanism was 1.3%.
【００５０】冷間圧延後の鋼板は缶胴に成形して、溶接
装置にて溶接し、ダイネッキング装置にてネック加工を
施した。The steel sheet after cold rolling was formed into a can body, welded by a welding device, and necked by a die necking device.
【００５１】ネック成形後の缶円周に座屈しわの発生が
ない場合は、ネックイン成形性が良好であるとして評点
に〇印をつけ、しわが確認されたものは不良として評点
に×印をつけた。×印は比較例の高強度材Ｎｏ．４のみ
である。When there is no buckling wrinkle on the circumference of the can after neck forming, a mark of ◯ is given to indicate that the neck-in formability is good. I put on. The cross mark indicates the high-strength material No. of the comparative example. Only four.
【００５２】次いで、フランジ成形性を評価するコーン
テストの圧壊ストローク長さを調査した。圧壊ストロー
ク長さが５ｍｍ以上の場合は、経験的にフランジ成形性
が良好とされているため、評点に〇印をつけ、圧壊スト
ローク長さが５ｍｍ未満では、フランジ割れの懸念あり
として評点に×印をつけた。×印は比較例の高強度材Ｎ
ｏ．４のみである。Next, the crushing stroke length of the cone test for evaluating the flange formability was investigated. If the crush stroke length is 5 mm or more, the flange formability is empirically considered to be good, so a mark is marked, and if the crush stroke length is less than 5 mm, there is a risk of flange cracking. I marked it. The cross indicates the high-strength material N of the comparative example.
o. Only four.
【００５３】また、シュミレーション実験の各工程の材
質を引張り試験にて調査した。The material of each step of the simulation experiment was investigated by a tensile test.
【００５４】缶胴の強度評価は、基準を比較例Ｎｏ．４
の自然時効後０．２％耐力とした。Ｎｏ．４材は加工性
に問題があるが実用レベルの缶胴強度を有するためであ
る。For the evaluation of the strength of the can body, the standard was used as Comparative Example No. Four
0.2% proof stress after natural aging. No. This is because the four materials have a problem in workability, but have a practical barrel strength.
【００５５】降伏点の調査結果のうち、代表例を
（ａ）、（ｂ）、（ｃ）として、図２に示す。Of the results of the yield point investigation, representative examples (a), (b), and (c) are shown in FIG.
【００５６】本発明材（ｃ）および本発明材Ｎｏ．２、
３の自然時効後の降伏強度は、Ｎｏ．４材の基準強度以
上にあり、ネック加工、フランジ加工後の缶胴部の強度
は、２ＣＲ高強度材（ｂ）に劣らぬ優れた強度を有して
いる。Inventive material (c) and inventive material No. 2,
The yield strength after natural aging of No. 3 is No. The strength of the can body portion after the neck processing and the flange processing is equal to or higher than the standard strength of the four materials, and is as good as that of the 2CR high strength material (b).
【００５７】[0057]
【表１】 [Table 1]
【００５８】[0058]
【発明の効果】従来の連続焼鈍材は、２ＣＲ法による冷
延加工硬化を用いてきたため、ネック成形性やフランジ
加工性と缶胴強度を両立できず不十分な改善効果しか得
られなかった。Since the conventional continuous annealed material has been cold-rolled and hardened by the 2CR method, the neck formability and flange formability and the strength of the can body cannot be achieved at the same time, and only an insufficient improvement effect is obtained.
【００５９】本発明によって、従来は製缶加工面から阻
害要因として扱われてきた残留固溶Ｃ、固溶Ｎが（食缶
用溶接機の製缶プロセスを詳細に検討することにより）
ネックイン加工性を含め、製缶加工性と缶胴強度確保を
両立させる有効な成分であることが初めて確認され、そ
の利用法も確立した。According to the present invention, the residual solid solution C and solid solution N, which have been conventionally treated as an inhibiting factor from the can manufacturing process side (by examining the can manufacturing process of the food can welding machine in detail).
It has been confirmed for the first time that it is an effective component that achieves both can-making processability and securing of can body strength, including neck-in processability, and its utilization method has also been established.
【００６０】これまでの溶接缶素材の加工性改善には、
残留固溶Ｃ、固溶Ｎの低減に多大な努力が払われていた
だけに、省資源、省エネルギーに寄与するところ大であ
り、その経済的効果は非常に大きい。In order to improve the workability of the material of the welding can thus far,
Great efforts have been made to reduce the amount of residual solid solution C and solid solution N, and the fact that it contributes to resource saving and energy saving is great, and its economic effect is very large.
【図１】溶接缶の実作業に沿って材質の変化を時系列的
に調査するため、各製缶工程で素材に施される加工を実
験的にシミュレーションした要領を示す図である。FIG. 1 is a diagram showing a procedure of experimentally simulating the processing performed on a material in each can manufacturing process in order to time-sequentially investigate changes in the material along the actual work of the welding can.
【図２】溶接缶製造工程の加工履歴と缶胴強度の変化を
示す実験例に基づく図である。FIG. 2 is a diagram based on an experimental example showing changes in processing history and can body strength in a welding can manufacturing process.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 廣渡 美真 北九州市戸畑区飛幡町１−１ 新日本製 鐵株式会社 八幡製鐵所内 (56)参考文献 特開 平６−306534（ＪＰ，Ａ) 特開 平６−41681（ＪＰ，Ａ) 特開 平８−60298（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Mima Hiroto 1-1, Tobata-cho, Tobata-ku, Kitakyushu Inside the Yawata Works, (56) References JP-A-6-306534 (JP, A) JP-A-6-41681 (JP, A) JP-A-8-60298 (JP, A)
Claims (3)
０ｐｐｍ≦固溶Ｃ＋固溶Ｎなる関係を有し、さらに上降
伏点が４２ｋｇｆ／ｍｍ2以上であることを特徴とす
る、缶胴部の降伏強度が高く、かつネック成形性および
フランジ成形性に優れた溶接缶胴用鋼板。1. By weight%, C: 0.005 to 0.05%, AL: 0.08% or less, N: 0.012% or less, and C and N which form a solid solution in the steel sheet. In between 5
It has a relationship of 0 ppm ≦ solid solution C + solid solution N, and has an upper yield point of 42 kgf / mm 2 or more, which has a high yield strength of the body of the can and has good neck formability and flange formability. Excellent steel plate for welding can bodies.
て、鋼板中に固溶するＮ量が、５０ｐｐｍ≦固溶Ｎの範
囲で、かつ上降伏点が４２ｋｇｆ／ｍｍ2以上であるこ
とを特徴とする、缶胴部の降伏強度が高く、かつネック
成形性およびフランジ成形性に優れた溶接缶胴用鋼板。2. The thin steel plate for a welding can according to claim 1, wherein the amount of N dissolved in the steel plate is within a range of 50 ppm ≦ solid solution N, and the upper yield point is 42 kgf / mm 2 or more. A steel plate for a welded can body having high yield strength of the can body and excellent neck formability and flange formability.
焼鈍法を施した後、５％以上１５％未満の圧下率の調質
圧延を行い、鋼板中に固溶するＣおよびＮの間に、５０
ｐｐｍ≦固溶Ｃ＋固溶Ｎ、または５０ｐｐｍ≦固溶Ｎな
る関係を有し、さらに上降伏点が４２ｋｇｆ／ｍｍ2以
上であることを特徴とする、缶胴部の降伏強度が高く、
かつネック成形性およびフランジ成形性に優れた溶接缶
胴用鋼板の製造方法。3. A continuously cast steel slab containing C: 0.005 to 0.05%, AL: 0.08% or less, and N: 0.012% or less by weight, and hot-rolled. After performing the continuous annealing method, temper rolling with a reduction ratio of 5% or more and less than 15% is performed, and between C and N that form a solid solution in the steel sheet, 50
The yield strength of the can body is high, which has a relationship of ppm ≦ solid solution C + solid solution N, or 50 ppm ≦ solid solution N, and an upper yield point of 42 kgf / mm 2 or more,
A method for producing a steel plate for a welding can body having excellent neck formability and flange formability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28456596A JP3534960B2 (en) | 1996-10-08 | 1996-10-08 | Steel plate for welded can body having high yield strength and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28456596A JP3534960B2 (en) | 1996-10-08 | 1996-10-08 | Steel plate for welded can body having high yield strength and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10110238A JPH10110238A (en) | 1998-04-28 |
| JP3534960B2 true JP3534960B2 (en) | 2004-06-07 |
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ID=17680114
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28456596A Expired - Lifetime JP3534960B2 (en) | 1996-10-08 | 1996-10-08 | Steel plate for welded can body having high yield strength and method for producing the same |
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| Country | Link |
|---|---|
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| JP5316036B2 (en) * | 1999-08-04 | 2013-10-16 | Ｊｆｅスチール株式会社 | Mother board for high-strength ultrathin cold-rolled steel sheet and manufacturing method thereof |
| JP4486414B2 (en) * | 2004-06-11 | 2010-06-23 | 新日本製鐵株式会社 | Thin steel plate for cans with strong can body strength and good press workability and method for producing the same |
| JP4546922B2 (en) * | 2005-12-28 | 2010-09-22 | 新日本製鐵株式会社 | Continuously annealed DR steel sheet for 3-piece welded can and method for producing the same |
| TW200827460A (en) * | 2006-08-11 | 2008-07-01 | Nippon Steel Corp | DR steel sheet and manufacturing method thereof |
| JP4943244B2 (en) * | 2007-06-27 | 2012-05-30 | 新日本製鐵株式会社 | Steel sheet for ultra-thin containers |
| BRPI0911139B1 (en) * | 2008-04-03 | 2018-03-13 | Jfe Steel Corporation | HIGH RESISTANCE STEEL PLATE FOR CAN AND METHOD FOR PRODUCTION |
| CN106086643B (en) * | 2016-06-23 | 2018-03-30 | 宝山钢铁股份有限公司 | The uncoated tinplate base and its secondary cold-rolling method of a kind of high-strength high-elongation |
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