JP4325436B2 - Steel plate for cans, steel plate for cans and method for producing them - Google Patents
Steel plate for cans, steel plate for cans and method for producing them Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 71
- 239000010959 steel Substances 0.000 title claims description 71
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 238000005096 rolling process Methods 0.000 claims description 42
- 238000007747 plating Methods 0.000 claims description 39
- 230000003746 surface roughness Effects 0.000 claims description 27
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 description 11
- 238000000137 annealing Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000005028 tinplate Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000005029 tin-free steel Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
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Description
本発明は、缶用鋼板用原板と缶用鋼板に関し、特に、すずめっき後の表面光沢に優れる缶用鋼板用原板とその製造方法ならびにその原板から製造される缶用鋼板とその製造方法に関するものである。 TECHNICAL FIELD The present invention relates to a steel plate for cans and a steel plate for cans, and more particularly, to a steel plate for cans excellent in surface gloss after tin plating, a manufacturing method thereof, a steel plate for cans manufactured from the original plate, and a manufacturing method thereof. It is.
ぶりきやティンフリースチール等の缶用鋼板は、各種の飲料缶、食缶、菓子缶等の化粧缶、ガロン缶、ペール缶およびその他雑缶などに広く用いられている。これら缶用鋼板は、消費者の嗜好に合った表面(表面粗度、表面光沢、表面色調)とするために、用途によりその表面仕上げを、Ｂ(ブライト仕上げ)、Ｒ(粗面仕上げ)、Ｓ(シルバー仕上げ)およびＭ(マット仕上げ)等に区分して製造されている。 Steel plates for cans such as tinplate and tin-free steel are widely used in cosmetic cans such as various beverage cans, food cans and confectionery cans, gallon cans, pail cans and other cans. These steel sheets for cans have a surface (surface roughness, surface gloss, surface color tone) that suits consumers' tastes. Depending on the application, the surface finish may be B (bright finish), R (rough finish), Manufactured by dividing into S (silver finish) and M (matte finish).
ところで、近年、消費者の好みの多様化に伴い、表面光沢に優れる缶用鋼板(特に、ぶりき)が要求されることが多くなった。また、鋼板の表面にすず(Sn)を電気めっきしたぶりきの場合、めっき金属であるSnが希少金属であることから、できるだけ目付量を低減したいという要求がある。しかし、目付量を減らすことは、表面光沢度の低下を招くといういう問題がある。 Incidentally, in recent years, with the diversification of consumer preferences, steel plates for cans (especially tinplate) that are excellent in surface gloss have been increasingly demanded. Further, when tin (Sn) is electroplated on the surface of a steel sheet, there is a demand for reducing the basis weight as much as possible because Sn, which is a plating metal, is a rare metal. However, reducing the basis weight has a problem that the surface glossiness is lowered.
表面光沢を改善する方法としては、すずめっきの目付量を増やしたり、めっき浴中に光沢剤などを添加したりすることも行われているが、調質圧延(スキンパス圧延)において使用するロール粗度を調整することにより、めっき原板の表面粗度を低減する方法が一般的である。例えば、特許文献１には、鋼板を複数スタンドの圧延機にて調質圧延を行うに当たり、少なくとも最前段の圧延ロール粗度をＲa 1.2μm以下のスクラッチブライトロールとし、少なくとも最後段の圧延ロール粗度をＲa 0.5μm以下のブライトロールとして調質圧延を行うことにより、高光沢の缶用鋼板を得る技術が開示されている。また、特許文献２には、２スタンドの調質圧延機を用いて調質圧延するに当たり、前段スタンドのワークロールとして、放電加工によりＰＰＩを300以上、Ｒaを0.5〜1.5μmに調整したダル仕上げロールを用い、後段スタンドのワークロールとして、Ｒaが0.1超〜0.4μmのブライトロールを用いて行うことにより、表面光沢に優れた硬質缶用鋼板を得る技術が開示されている。
しかしながら、上記従来技術のように、調質圧延のロール粗度を制御して調質圧延を行っていても、工程的に生産している缶用鋼板の中には、時として、すずめっき後の光沢不良が大量に発生することがあった。また、調質圧延後の鋼板(即ち、めっき原板)の表面粗度は、ロールを交換した当初は低粗度であっても、圧延距離の増加に伴いロール粗度が急激に大きくなり、安定して板面粗度を小さく制御できず、めっき後の光沢不良を発生することがあり、ロール交換を頻繁に行わざるを得ないという問題もあった。特に、その傾向は、Ｃが0.0050mass％以下の極低Ｃ材で、Mnを0.3〜0.6mass％と比較的高めに含有する缶用鋼板において多発する傾向があった。 However, even if temper rolling is performed by controlling the roll roughness of the temper rolling as in the above prior art, some of the steel plates for cans produced in the process are sometimes after tin plating. In some cases, a large amount of poor gloss occurred. Also, the surface roughness of the steel sheet after temper rolling (i.e., the plating plate) is low roughness at the beginning of replacing the roll. Thus, the roughness of the plate surface cannot be controlled to be small, a gloss failure after plating may occur, and rolls must be frequently replaced. In particular, the tendency tended to occur frequently in steel sheets for cans, in which C is an extremely low C material having 0.0050 mass% or less and Mn is relatively high at 0.3 to 0.6 mass%.
上記のように、従来技術だけでは、調質圧延後のめっき原板の表面粗度を安定して小さく制御できないという問題があった。この問題に対しては、調質圧延後のコイルを、抜き取りで試験的にめっき工程に流したり、各コイルからサンプルを採取してめっき試験を行い事前に評価を行ったりしていたため、生産性の低下の原因となっていた。そのため、安定して、めっき原板の表面粗度を小さく制御できる技術の開発が求められていた。 As described above, the conventional technique alone has a problem that the surface roughness of the plated original sheet after the temper rolling cannot be stably controlled to be small. To deal with this problem, the coil after temper rolling was sampled and flowed to the plating process on a trial basis, or samples were taken from each coil and a plating test was conducted to evaluate in advance. Was the cause of the decline. Therefore, development of a technique that can stably control the surface roughness of the original plating plate to be small has been demanded.
本発明の目的は、上記のような極低Ｃ高Mn材を素材とする缶用鋼板においても、めっき原板の表面粗度を安定して小さく制御でき、すずめっき後の光沢不良を引き起こすことのない缶用鋼板用原板とその製造方法ならびにその原板から得られる缶用鋼板とその製造方法を提案することにある。 The object of the present invention is that the surface roughness of the original plating plate can be stably controlled to be small even in the steel plate for cans made of the extremely low C high Mn material as described above, which causes poor gloss after tin plating. An object of the present invention is to propose an original steel plate for cans and a manufacturing method thereof, a steel plate for cans obtained from the original plate and a manufacturing method thereof.
発明者らは、極低Ｃ高Mn材における上記光沢不良の発生原因について種々の調査を行った。その結果、鋼素材中のＳ含有量が低い材料において、光沢不良が多発していること、従って、Ｓ含有量を適正範囲に規制することにより、缶用鋼板用原板の調質圧延後の表面粗度を安定して小さく制御でき、ひいては表面光沢に優れるすずめっき鋼板を安定して製造できることを見出し、本発明を想到した。 The inventors conducted various investigations on the cause of the occurrence of the gloss failure in the extremely low C high Mn material. As a result, the surface after the temper rolling of the steel plate for cans by regulating the S content to an appropriate range because of poor glossiness in the low S content in the steel material. The present inventors have conceived that the present invention has been conceived by finding that a tin-plated steel sheet which can stably control the roughness to be small and can be stably manufactured with excellent surface gloss.
すなわち、本発明は、Ｃ：０．００５０ｍａｓｓ％以下、Ｍｎ：０．３０〜０．６０ｍａｓｓ％、Ｐ：０．０２ｍａｓｓ％以下、Ｓ：０．０１０〜０．０３ｍａｓｓ％、Ａｌ：０．０２〜０．２０ｍａｓｓ％、Ｎ：０．００５ｍａｓｓ％以下、Ｎｂ：０．０１０〜０．０２０ｍａｓｓ％を含有し、残部がＦｅおよび不可避的不純物からなり、板面粗度Ｒａが０．１５μm以下であることを特徴とする缶用鋼板用原板である。 That is, the present invention includes C: 0.0050 mass% or less, Mn: 0.30 to 0.60 mass%, P: 0.02 mass% or less, S: 0.010 to 0.03 mass%, Al: 0.02 0.20 mass%, N: 0.005 mass% or less, Nb: 0.010 to 0.020 mass%, the balance is made of Fe and inevitable impurities, and the plate surface roughness Ra is 0.15 μm or less. It is the original plate for steel plates for cans characterized by these.
また、本発明は、上記原板の表面に、すずめっき層を形成してなることを特徴とする缶用鋼板である。 Moreover, this invention is a steel plate for cans characterized by forming the tin plating layer in the surface of the said original plate.
また、本発明は、Ｃ：０．００５０ｍａｓｓ％以下、Ｍｎ：０．３０〜０．６０ｍａｓｓ％、Ｐ：０．０２ｍａｓｓ％以下、Ｓ：０．０１０〜０．０３ｍａｓｓ％、Ａｌ：０．０２〜０．２０ｍａｓｓ％、Ｎ：０．００５ｍａｓｓ％以下、Ｎｂ：０．０１０〜０．０２０ｍａｓｓ％を含有し、残部がＦｅおよび不可避的不純物からなる鋼素材を、熱間圧延、冷間圧延して連続焼鈍し、その後、調質圧延を行うことにより缶用鋼板用原板を製造する方法において、調質圧延時の最終スタンドにおけるワークロール粗度をＲａ≦０．２０μｍとして圧延を行うことを特徴とする缶用鋼板用原板の製造方法を提案する。上記製造方法により、板面粗度Ｒａが０．１５μｍ以下の缶用鋼板用原板を得ることができる。 Moreover, this invention is C: 0.0050 mass% or less, Mn: 0.30-0.60 mass%, P: 0.02 mass% or less, S: 0.010-0.03 mass% , Al: 0.02- A steel material containing 0.20 mass%, N: 0.005 mass% or less, Nb: 0.010 to 0.020 mass% , with the balance being Fe and inevitable impurities , hot rolled and cold rolled continuously. In the method of manufacturing an original sheet for steel plate for cans by annealing and then performing temper rolling, the work roll roughness at the final stand during temper rolling is rolled with Ra ≦ 0.20 μm. A method for manufacturing a steel plate for cans is proposed. By the said manufacturing method, plate | board surface roughness Ra can obtain the original plate for steel plates for cans of 0.15 micrometer or less.
また、本発明は、上記調質圧延後の原板表面に、すずめっきを施すことを特徴とする缶用鋼板の製造方法を提案する。上記製造方法により、めっき後の光沢度Ｇs(20°)が120以上の缶用鋼板を得ることができる。 Moreover, this invention proposes the manufacturing method of the steel plate for cans characterized by performing tin plating on the surface of the original plate after the temper rolling. By the above production method, a steel plate for cans having a gloss Gs (20 °) after plating of 120 or more can be obtained.
本発明によれば、缶用鋼板用原板の表面粗度を安定して小さく制御することができる。その結果、調質圧延における圧延ロールの交換頻度を大幅に低減できると共に、表面光沢に優れた缶用鋼板(すずめっき鋼板)を安定して製造することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, the surface roughness of the original plate for steel plates for cans can be controlled stably small. As a result, it is possible to significantly reduce the replacement frequency of rolling rolls in temper rolling, and to stably produce a steel plate for cans (tin-plated steel plate) having excellent surface gloss.
発明者らは、連続焼鈍後の冷延鋼板(ＪＩＳ規格：ＳＰＢ−Ｔ３、板厚0.3mm×板幅800mm×Ｃ)を、２スタンドの調質圧延機の第２スタンド(後段スタンド)に、表面粗度Ｒa：0.15μmのブライトロールを用いて調質圧延(圧下率：2.3％)を行った原板コイルに、片面辺り2.8ｇ/m2の付着量で両面に電気すずめっきを行った後、リフロー処理して製造したすずめっき鋼板について、めっき後の表面光沢不良とめっき原板の各種因子との関係を調査した。その結果、図１に示したように、光沢不良の発生率と素材中のＳ含有量との間に相関があり、Ｓが低い程、光沢不良率が高いことが明らかとなった。ここで、上記表面粗度Ｒaとは、JIS B 0601-1982に規定された中心線平均粗さのことであり、また、上記表面光沢とは、JIS Z 8741に規定された、試料面に20度の入射角で光束を入射し、鏡面反対方向に反射する光速を受光器で測定した20度鏡面光沢(Ｇs(20°))のことである。また、光沢不良とは、上記JIS Z 8741に準拠して測定しためっき後の光沢度Ｇs(20°)が120未満のものを言い、またその不良率とは、調質圧延後の各原板コイルを切板にした時に、光沢不良で格落ちした枚数の比率を表したものである。 The inventors of the present invention applied the cold-rolled steel sheet (JIS standard: SPB-T3, plate thickness 0.3 mm × plate width 800 mm × C) after continuous annealing to the second stand (second stage stand) of the two-stand temper rolling mill, After electroplating on both sides with a coating amount of 2.8 g / m 2 per side of a raw coil that has been temper rolled (rolling ratio: 2.3%) using a bright roll with a surface roughness Ra of 0.15 μm Regarding the tin-plated steel sheet manufactured by reflow treatment, the relationship between the surface gloss failure after plating and various factors of the plating original sheet was investigated. As a result, as shown in FIG. 1, there was a correlation between the occurrence rate of poor gloss and the S content in the material, and it became clear that the lower the S, the higher the gloss failure rate. Here, the surface roughness Ra is the centerline average roughness specified in JIS B 0601-1982, and the surface gloss is 20 on the sample surface specified in JIS Z 8741. This is a 20-degree specular gloss (Gs (20 °)) obtained by measuring the speed of light incident on a light beam at an incident angle of 50 degrees and reflected in the opposite direction of the specular surface with a light receiver. In addition, the gloss failure means that the glossiness Gs (20 °) after plating measured in accordance with the above JIS Z 8741 is less than 120, and the failure rate means each original coil after temper rolling. This is the ratio of the number of sheets that have been degraded due to poor gloss when is cut into plates.
上記のように、素材中に含まれるＳが、鋼板の表面粗度ひいてはめっき後の表面光沢に影響を及ぼす原因については明らかではないが、発明者らは以下のように考えている。Ｓは、焼鈍時のMnの表面濃化を抑制する効果がある。そのため、Ｓが低いと、鋼中に含まれているMnが表面に濃化して圧延ロールの表面を荒らす結果、調質圧延後の鋼板表面粗度が大きくなり、めっき後の光沢不良を引き起こすものと考えられる。また、Ｓが高い場合には、MnとSが結合してMnＳを形成し、焼鈍時におけるMnの表面濃化を抑制されることも考えられる。また、極低Ｃ材で、光沢異常が多いのは、Ｃ量が少ない場合には、Mnの表面濃化が促進されるからと考えられる。本発明は、上記知見に基き開発したものである。 As described above, the reason why S contained in the material affects the surface roughness of the steel sheet and thus the surface gloss after plating is not clear, but the inventors consider as follows. S has an effect of suppressing the surface concentration of Mn during annealing. Therefore, when S is low, Mn contained in the steel concentrates on the surface and roughens the surface of the rolling roll. As a result, the surface roughness of the steel sheet after temper rolling increases, resulting in poor gloss after plating. it is conceivable that. In addition, when S is high, Mn and S combine to form MnS, and it is considered that the surface concentration of Mn during annealing is suppressed. In addition, it is considered that the reason why the gloss is abnormal in the extremely low C material is that the surface concentration of Mn is promoted when the amount of C is small. The present invention has been developed based on the above findings.
次に、本発明の缶用鋼板についての限定理由について説明する。
Ｃ：0.0050mass％以下
すずめっきした缶用鋼板の光沢不良は、極低Ｃ材で主に発生する。そこで、本発明においては、対象材を、Ｃが0.0050mass％以下の極低Ｃ材に限定する。また、Ｃが0.0050mass％超えでは、固溶Ｃが多くなり過ぎて時効性等の材質劣化を引き起こし、また、固溶Ｃを固定するためのNb等の炭窒化物形成元素の増加を招くため実用上好ましくない。好ましくは、0.0030mass％以下である。一方、Ｃ含有量の下限は、特に定めないが、精錬コストから、0.0010mass％以上であることが好ましい。より好ましくは、0.0015〜0.0030mass％の範囲である。
Next, the reason for limitation about the steel plate for cans of this invention is demonstrated.
C: 0.0050 mass% or less The gloss failure of tin-plated steel plates for cans mainly occurs in extremely low C materials. Therefore, in the present invention, the target material is limited to an extremely low C material having C of 0.0050 mass% or less. On the other hand, if C exceeds 0.0050 mass%, the amount of solute C increases so much that it causes material deterioration such as aging, and also causes an increase in carbonitride forming elements such as Nb for fixing solute C. It is not preferable for practical use. Preferably, it is 0.0030 mass% or less. On the other hand, the lower limit of the C content is not particularly defined, but is preferably 0.0010 mass% or more from the refining cost. More preferably, it is the range of 0.0015-0.0030 mass%.
Mn：0.30〜0.60mass％
Mnは、鋼板強度を高めるために必要な元素である。0.30mass％未満では、強度向上効果が小さい。一方、MnはＡＳＴＭ(A623-00)で、その上限が0.60mass％と規定されており、汎用性を確保するためMnの上限は0.60mass％に制限する。よって、本発明は、Mnを0.30〜0.60mass％添加する。好ましくは、0.40〜0.60mass％の範囲である。
Mn: 0.30 ~ 0.60mass%
Mn is an element necessary for increasing the steel sheet strength. If it is less than 0.30 mass%, the strength improvement effect is small. On the other hand, Mn is ASTM (A623-00), and the upper limit is defined as 0.60 mass%. In order to ensure versatility, the upper limit of Mn is limited to 0.60 mass%. Therefore, the present invention adds 0.30 to 0.60 mass% of Mn. Preferably, it is in the range of 0.40 to 0.60 mass%.
Ｓ：0.010〜0.03mass％
Ｓは、焼鈍時のMnの表面濃化を抑制する、本発明において最も重要な元素である。上記効果を得るためには、Ｓは0.010mass％以上添加する必要がある。一方、ＳはＡＳＴＭ(A623-00)で、その上限が0.03mass％と規定されており、汎用性を確保するためＳの上限は0.03mass％に制限する。よって、本発明では、Ｓの含有量を0.010〜0.03mass％の範囲に限定する。好ましくは、0.010〜0.020mass％の範囲である。
S: 0.010-0.03mass%
S is the most important element in the present invention that suppresses the surface concentration of Mn during annealing. In order to acquire the said effect, S needs to add 0.010 mass% or more. On the other hand, S is ASTM (A623-00), and its upper limit is defined as 0.03 mass%. In order to ensure versatility, the upper limit of S is limited to 0.03 mass%. Therefore, in this invention, content of S is limited to the range of 0.010-0.03 mass%. Preferably, it is the range of 0.010-0.020 mass%.
本発明の缶用鋼板においては、上記Ｃ，MnおよびＳ以外の成分については、下記の範囲に規定することが好ましい。
Ｐ：0.02mass％以下
Ｐは、偏析し、粒界を脆化させる元素であり、0.02mass％以下に制限することが好ましい。より好ましくは、0.020mass％以下である。
In the steel plate for cans of the present invention, components other than the above C, Mn and S are preferably specified in the following ranges.
P: 0.02 mass% or less P is an element that segregates and embrittles grain boundaries, and is preferably limited to 0.02 mass% or less. More preferably, it is 0.020 mass% or less.
Al：0.02〜0.20mass％
Alは、製鋼工程において脱酸のために添加される元素である。また、固溶ＮをAlＮとして固定する効果もある。それらの効果を得るためには、0.02mass％以上添加することが好ましい。一方、0.20mass％を超えて添加すると、介在物が多くなり、表面性状を低下させるとともに、加工性を害するという問題があるため、0.20mass％以下に制限するのが好ましい。より好ましくは、0.020〜0.070mass％の範囲である。
Al: 0.02-0.20mass%
Al is an element added for deoxidation in the steelmaking process. Also, there is an effect of fixing the solid solution N as AlN. In order to obtain those effects, 0.02 mass% or more is preferably added. On the other hand, if it is added in excess of 0.20 mass%, the amount of inclusions increases, the surface properties are deteriorated, and the workability is impaired. Therefore, it is preferably limited to 0.20 mass% or less. More preferably, it is the range of 0.020-0.070 mass%.
Ｎ：0.005mass％以下
Ｎは、0.005mass％を超えて添加すると、時効劣化を引き起こすため、0.005mass％以下に制限するのが好ましい。より好ましくは、0.004mass％以下である。
N: 0.005 mass% or less Since N causes aging deterioration when added over 0.005 mass%, it is preferable to limit it to 0.005 mass% or less. More preferably, it is 0.004 mass% or less.
Nb：0.010〜0.020mass％
Nbは、Ｃ，Ｎを析出物として固定するという効果を有する元素である。この効果を得るためには、0.010mass％以上添加することが好ましい。一方、0.020mass％を超えて添加すると、原料コストの上昇を招くため、0.020mass％以下に制限するのが好ましい。より好ましくは、0.014〜0.018mass％の範囲である。
Nb: 0.010-0.020mass%
Nb is an element having an effect of fixing C and N as precipitates. In order to obtain this effect, 0.010 mass% or more is preferably added. On the other hand, if added over 0.020 mass%, the cost of raw materials will increase, so it is preferable to limit it to 0.020 mass% or less. More preferably, it is the range of 0.014-0.018 mass%.
本発明の缶用鋼板においては、上記成分以外は、Feおよび不可避的不純物からなることが好ましい。 In the steel plate for cans of this invention, it is preferable to consist of Fe and an unavoidable impurity other than the said component.
次に、本発明の缶用鋼板用原板およびその原板にすずめっきした缶用鋼板について説明する。
本発明の缶用鋼板用原板は、すずめっきした後、優れた表面光沢度を有することが必要とされる。具体的には、前述したように、片面当たり付着量2.8ｇ/m2の電気すずめっき後、リフロー処理したすずめっき鋼板の表面光沢度Ｇs(20°)が120以上であることが必要である。
Next, the original plate for steel plate for cans of the present invention and the steel plate for cans plated with tin on the original plate will be described.
The original plate for steel plate for cans of the present invention is required to have excellent surface gloss after tin plating. Specifically, as described above, the surface glossiness Gs (20 °) of the tin-plated steel sheet that has been subjected to reflow treatment after electrotin plating with an adhesion amount of 2.8 g / m 2 per side needs to be 120 or more. .
図２は、片面当たり付着量2.8ｇ/m2の電気すずめっき後、リフロー処理したすずめっき鋼板の表面光沢度に及ぼす原板の表面粗度の影響を示したものである。この図２から、めっき原板とすずめっき鋼板の表面光沢度の間には相関があり、表面光沢度Ｇs(20°)120以上を得るためには、原板の表面粗度をＲa 0.15μm以下に制御する必要があることがわかる。よって、本発明においては、缶用鋼板用原板の表面粗度Ｒaを0.15μm以下に制限する。 FIG. 2 shows the influence of the surface roughness of the original plate on the surface gloss of a tin-plated steel sheet that has been subjected to reflow treatment after electrotin plating with an adhesion amount of 2.8 g / m 2 per side. From FIG. 2, there is a correlation between the surface gloss of the plating base plate and the tin plated steel plate, and in order to obtain the surface glossiness Gs (20 °) of 120 or more, the surface roughness of the base plate should be Ra 0.15 μm or less. It turns out that it needs to be controlled. Therefore, in the present invention, the surface roughness Ra of the steel plate for cans is limited to 0.15 μm or less.
次に、本発明の缶用鋼板用原板の製造方法について説明する。
本発明の缶用鋼板用原板は、上述した成分組成を有する鋼を常法に従い溶製し、鋼スラブとした後、熱間圧延と冷間圧延した後、連続焼鈍し、調質圧延を行う工程を経て製造される。この時の連続焼鈍までの製造条件については、特に規定する必要はなく、従来公知の条件で行えばよい。
Next, the manufacturing method of the original plate for steel plates for cans of the present invention will be described.
The original steel plate for cans according to the present invention is prepared by melting steel having the above-described component composition according to a conventional method to form a steel slab, hot rolling and cold rolling, continuous annealing, and temper rolling. It is manufactured through a process. The manufacturing conditions up to the continuous annealing at this time do not need to be specified in particular, and may be performed under conventionally known conditions.
次に、上記缶用鋼板用原板の表面粗度を得るための調質圧延について説明する。
上記原板の表面粗度Ｒa 0.15μm以下を得るためには、調質圧延における最終スタンドに用いるロール粗度は低いほどよく、Ｒa 0.20μm以下に規制する必要がある。好ましくは、Ｒa 0.10〜0.18μmである。また、調質圧延における圧下率は、特に制限しないが、通常の操業の圧下率であれば、ロール粗度Ｒa：0.20μm以下で、原板の板面粗度Ｒa：0.15μm以下を得ることができる。好ましい圧下率は、２〜３％である。
Next, temper rolling for obtaining the surface roughness of the original steel plate for cans will be described.
In order to obtain the surface roughness Ra of 0.15 μm or less of the original sheet, the roll roughness used for the final stand in the temper rolling is preferably as low as possible and must be regulated to Ra of 0.20 μm or less. Preferably, Ra is 0.10 to 0.18 μm. Further, the rolling reduction in temper rolling is not particularly limited, but if it is a rolling reduction in normal operation, roll roughness Ra: 0.20 μm or less and plate surface roughness Ra: 0.15 μm or less can be obtained. it can. A preferable rolling reduction is 2-3%.
上記缶用鋼板用原板の表面に、すずめっき層を形成して缶用鋼板(ぶりき)を得る方法は、特に制限する必要はなく、常法に従いすずめっきを施せばよい。なお、缶用鋼板の製造において、すずめっきは通常、電気めっきにて行われる。本発明の缶用鋼板原板は、片面当たりの付着量が2.8ｇ/m2という比較的薄い電気すずめっきであっても、リフロー処理後の表面光沢度Ｇs(20°)120以上を得ることができる。 The method for obtaining a steel plate for tins (cover) by forming a tin plating layer on the surface of the original steel plate for cans is not particularly limited, and tin plating may be performed according to a conventional method. In the production of steel plates for cans, tin plating is usually performed by electroplating. The original steel plate for cans of the present invention can obtain a surface glossiness Gs (20 °) of 120 or more after the reflow treatment even when the amount of adhesion per side is relatively thin 2.8 g / m 2. it can.
なお、上記の説明においては、缶用鋼板として、すずめっきをしたぶりきを中心に説明してきたが、表面光沢あるいは表面粗度が小さいことが要求される他のめっき鋼板、例えば、ティンフリースチール等にも、本発明の技術を有効に適用することができる。 In the above description, the tin steel plate has been mainly described as the steel plate for cans, but other plated steel plates that are required to have low surface gloss or low surface roughness, such as tin-free steel, are used. The technique of the present invention can be effectively applied to the above.
Ｃ：0.0010〜0.0030mass％、Mn：0.40〜0.60mass％、Ｐ：0.020mass％以下、Al：0.020〜0.070mass％、Ｎ：0.004mass％以下、Nb：0.014〜0.018mass％を含有し、Ｓが0.008mass％と0.015mass％の２水準とした鋼素材を夫々15本ずつ用意し、これらの素材を、同一の条件で、熱間圧延し、冷間圧延して板厚0.30mm×板幅800mmの冷延コイルとし、その後、このコイルを760℃×10秒で連続焼鈍後、２スタンドの圧延機で圧下率2.5％のドライで調質圧延を行い、ＪＩＳ規格：ＳＰＢ−Ｔ３の缶用鋼板用原板コイルとした。この時の調質圧延は、第１スタンド(前段スタンド)のワークロールには、ロール粗度Ｒa 0.5μmのブライトロールを用い、また、第２スタンド(後段スタンド)のワークロールには、ロール粗度Ｒa 0.18μmのブライトロールを用いて行った。また、Ｓが0.008mass％と0.015mass％の２水準の各１5コイルは、それぞれ新しいロールに交換した後、１５コイルをまとめて調質圧延した。調質圧延後の原板コイルは、コイル準備ラインに通板し、耳切りとコイル先後端の不良部分をカットすると共に、コイル長手中央部から原板サンプルを採取した。その後、原板コイルを、電気すずめっきラインに通板し、片面当たり2.8ｇ/m2の付着量で両面に電気すずめっきを施すと共におよびリフロー処理を行うすずめっき処理を施した後、剪断ラインにて切板とした。この際、コイル中央部からサンプルを採取した。上記採取した原板サンプルおよび切板サンプルについては、JIS B 0601-1982に規定された中心線平均粗さＲaおよびJIS Z 8741に規定された表面光沢度Ｇs(20°)を測定した。 C: 0.0010 to 0.0030 mass%, Mn: 0.40 to 0.60 mass%, P: 0.020 mass% or less, Al: 0.020 to 0.070 mass%, N: 0.004 mass% or less, Nb: 0.014 to 0.018 mass%, S Prepare 15 steel materials of 0.008mass% and 0.015mass%, each of which has 15 levels, hot rolled under the same conditions, cold rolled, plate thickness 0.30mm × sheet width 800mm cold-rolled coil, after which this coil is continuously annealed at 760 ° C for 10 seconds, and then temper rolled with a two-stand rolling mill with a rolling reduction of 2.5%. For cans of JIS standard: SPB-T3 A steel sheet coil was used. The temper rolling at this time uses a bright roll with a roll roughness Ra of 0.5 μm for the work roll of the first stand (front stage stand) and the roll roll for the work roll of the second stand (rear stage stand). A bright roll having a degree Ra of 0.18 μm was used. Further, 15 coils each having two levels of S of 0.008 mass% and 0.015 mass% were replaced with new rolls, and then 15 coils were subjected to temper rolling. The original coil after the temper rolling was passed through a coil preparation line to cut off a defective portion of the edge cut and the coil tip rear end, and an original plate sample was collected from the longitudinal center of the coil. After that, the original coil was passed through the electric tin plating line, electroplated on both sides with a coating amount of 2.8 g / m 2 per side and tin-plated with reflow treatment. It was cut and cut. At this time, a sample was taken from the center of the coil. With respect to the collected original plate sample and cut plate sample, the center line average roughness Ra specified in JIS B 0601-1982 and the surface glossiness Gs (20 °) specified in JIS Z 8741 were measured.
図３に、原板の表面粗度とめっき後の表面光沢度との関係を、Ｓが0.008mass％のコイルと0.015mass％のコイルに分けて示した。なお、図中の○印や▲印に示したＳは、ロール替え１コイル目のコイル、Ｅはロール替え15コイル目のコイルであることを示す。この結果から、Ｓ含有量を0.010mass％以上とした本発明例に係る原板はいずれも原板の表面粗度がＲa≦0.15μmであり、かつ、めっき後の表面光沢もＧs(20°)で120以上が得られている。また、調質圧延のロール替え１コイル目と15コイル目とで、原板の表面粗度、めっき後の表面光沢度に大きな変化はなく安定していることがわかる。一方、Ｓが0.010mass％未満である本発明外のコイルでは、ロール替え１コイル目の原板の表面粗度およびめっき後の表面光沢度は良好であるものの、調質圧延のコイル数が増すにつれて原板粗度が大きくなり、それに伴って、めっき後の表面光沢度が悪化しており、表面光沢が安定していないことがわかる。 FIG. 3 shows the relationship between the surface roughness of the original plate and the surface gloss after plating, divided into a coil having S of 0.008 mass% and a coil having 0.015 mass%. In the figure, S indicated by a circle mark or a triangle mark indicates that the coil is the first coil of roll change and E is the coil of the 15th coil of roll change. From these results, all of the original plates according to the present invention having an S content of 0.010 mass% or more had a surface roughness Ra ≦ 0.15 μm, and the surface gloss after plating was Gs (20 °). More than 120 have been obtained. It can also be seen that the surface roughness of the original sheet and the surface gloss after plating are stable with no significant change between the first coil and the 15th coil of roll change in temper rolling. On the other hand, in the coil outside the present invention in which S is less than 0.010 mass%, the surface roughness and the surface glossiness after plating of the original sheet of the first coil of roll change are good, but as the number of coils for temper rolling increases. It can be seen that the roughness of the original plate is increased, and accordingly, the surface gloss after plating is deteriorated and the surface gloss is not stable.
本発明の技術は、ぶりき以外の缶用鋼板にも適用することができる。 The technology of the present invention can also be applied to can steel plates other than tinplate.
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| JP7256747B2 (en) | 2017-10-25 | 2023-04-12 | 日本板硝子株式会社 | glass composition |
| CN113661148B (en) * | 2019-04-12 | 2023-09-29 | Ａｇｃ株式会社 | Alkali-free glass and glass plate |
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| JP4695618B2 (en) * | 2007-04-06 | 2011-06-08 | 新日本製鐵株式会社 | Steel plate for 3-piece can, manufacturing method thereof, and apparatus used for manufacturing the same |
| JP5104413B2 (en) * | 2008-03-07 | 2012-12-19 | Ｊｆｅスチール株式会社 | Manufacturing method of steel plate for cans |
| CN102766800A (en) * | 2011-05-05 | 2012-11-07 | 上海梅山钢铁股份有限公司 | Steel for hard tinplate bottle caps and production method thereof |
| CN111344075B (en) * | 2017-11-27 | 2022-07-08 | 杰富意钢铁株式会社 | Steel sheet, method for producing same, and secondary cold rolling mill |
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| JP7256747B2 (en) | 2017-10-25 | 2023-04-12 | 日本板硝子株式会社 | glass composition |
| CN113661148B (en) * | 2019-04-12 | 2023-09-29 | Ａｇｃ株式会社 | Alkali-free glass and glass plate |
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