JP5195271B2 - Tin-plated steel sheet and method for producing the same - Google Patents

Tin-plated steel sheet and method for producing the same Download PDF

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JP5195271B2
JP5195271B2 JP2008270646A JP2008270646A JP5195271B2 JP 5195271 B2 JP5195271 B2 JP 5195271B2 JP 2008270646 A JP2008270646 A JP 2008270646A JP 2008270646 A JP2008270646 A JP 2008270646A JP 5195271 B2 JP5195271 B2 JP 5195271B2
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steel sheet
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秀夫 木島
啓 久保
卓矢 坂本
為彦 藍
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JFE Steel Corp
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Description

本発明は、ぶりき(電気錫めっき鋼板)に代表される錫めっき鋼板およびその製造方法に関する。   The present invention relates to a tin-plated steel sheet represented by tinplate (electro tin-plated steel sheet) and a method for producing the same.

一般に、ぶりき鋼板は、熱間圧延、冷間圧延、焼鈍の処理が行われた後、調質圧延にて材質および表面性状が調整され、その後めっきラインで錫めっきが施されて製造される。   In general, tinplate steel sheets are manufactured by hot rolling, cold rolling and annealing treatments, and then the material and surface properties are adjusted by temper rolling, followed by tin plating on the plating line. .

ぶりきは表面が脆く、表面が削れやすいという特徴を持っている。このため、ぶりき材が通過するラインでは、削られた粉が堆積し、通過材の表面をさらに削ったり、堆積した粉が製品に付着するといった問題がある。このような問題を避けるため、定期的に清掃し、堆積した粉を取り除く必要がある。削られた粉は、ぶりき表層の油、化成処理皮膜、錫めっきなどの混成成分で、スマッジと呼ばれる。スマッジが多く発生するぶりき材を通板すると、短時間で清掃が必要となったり、製品へ粉が付着する危険性が高くなる。スマッジは、ぶりきの歴史とともに存在する問題であり、スマッジを少なくすること、つまり耐スマッジ性の改善が求められている。   Tinplate has a characteristic that the surface is brittle and the surface is easy to scrape. For this reason, in the line through which the tinting material passes, there is a problem that the scraped powder accumulates, the surface of the passing material is further shaved, and the deposited powder adheres to the product. In order to avoid such problems, it is necessary to periodically clean and remove the accumulated powder. The ground powder is a mixed component such as oil on the surface layer, chemical conversion coating, and tin plating, and is called smudge. If a plate that produces a lot of smudge is passed through, cleaning will be necessary in a short time, and the risk of powder adhering to the product will increase. Smudge is a problem that exists with the history of tinplate, and there is a demand for reducing smudge, that is, improving smudge resistance.

このようなスマッジの問題に対しては、めっき処理方法の調整によって、めっき層構造の最適化を図ることにより改善する方法が知られている(例えば、特許文献1参照)。   A method for improving such a smudge problem by optimizing the plating layer structure by adjusting the plating method is known (see, for example, Patent Document 1).

また、スマッジは、表層の油分量が少ないと顕著に発生しやすくなることが知られており(非特許文献1)、油分量には十分気を配る必要がある。
特開昭61−104099号公報 「ぶりきとティンフリー・スチール」東洋鋼鈑株式会社 アグネ 1970
In addition, it is known that smudge is prominently generated when the amount of oil in the surface layer is small (Non-Patent Document 1), and it is necessary to pay sufficient attention to the amount of oil.
Japanese Patent Application Laid-Open No. 61-104099 “Buri and Tin Free Steel” Toyo Kohan Co., Ltd. Agne 1970

しかしながら、表面を適正に制御して耐スマッジ性を改善する試みは、一定の効果を得てはいるものの、スマッジ問題を解消したわけではない。特に、製缶メーカーの塗装工程などでは、耐スマッジ性が著しく問題となる場合がある。塗装後は、表面が保護されるため、スマッジ発生の心配はなくなるが、その途中段階が問題となる。すなわち、片面を塗装するために熱処理を加えた場合、塗装面は保護されるので問題はないが、非塗装面は、熱処理の影響で表面の油が揮発し、酸化錫が増加した状態となる。酸化錫は脆く、酸化錫の増加は耐スマッジ性に悪影響を及ぼす。そのため、油がなく、酸化錫が増加した表面は、耐スマッジ性が著しく劣ることとなる。したがって、特許文献1のように初期の酸化錫量を低くしたり、非特許文献1に従って十分な塗油を行っていたとしても、塗装工程で、酸化錫が増加し、油が揮発してしまえば、ほとんど効果がなくなる。   However, attempts to improve the smudge resistance by appropriately controlling the surface have achieved a certain effect, but have not solved the smudge problem. In particular, smudge resistance may be a significant problem in the painting process of can manufacturers. After painting, the surface is protected, so there is no need to worry about smudge, but the middle stage becomes a problem. That is, when heat treatment is applied to paint one side, the painted surface is protected and there is no problem, but the oil on the non-painted surface is volatilized due to the heat treatment, and tin oxide is increased. . Tin oxide is brittle, and the increase in tin oxide adversely affects smudge resistance. Therefore, the surface without oil and with increased tin oxide is significantly inferior in smudge resistance. Therefore, even if the initial tin oxide amount is lowered as in Patent Document 1 or sufficient oil is applied according to Non-Patent Document 1, tin oxide increases and the oil volatilizes in the painting process. For example, it is almost ineffective.

本発明は、かかる事情に鑑みてなされたものであって、耐スマッジ性に優れた錫めっき鋼板およびその製造方法を提供することを目的とする。   This invention is made | formed in view of this situation, Comprising: It aims at providing the tin-plated steel plate excellent in smudge resistance, and its manufacturing method.

本発明者らは、表面の状態によらず、耐スマッジ性が良好になる解決方法を見出すべく検討を重ねた。その結果、めっき原板(下地鋼板)の表面粗さ(Ra)を大きくすると、耐スマッジ性が良好になることを見出した。しかし、表面粗さ(Ra)は、製品の外観や溶接性などにも影響し、製品規格ともなっているため、表面粗さ(Ra)のみの変更で耐スマッジ性を十分なものとすることが困難であることが判明した。そこで、さらに検討を重ねた結果、めっき原板の表面粗さ(Ra)のみではなく、粗さピークの形状も重要であることを知見し、本発明を完成するに至った。   The present inventors have repeatedly studied to find a solution that improves smudge resistance regardless of the surface condition. As a result, it was found that when the surface roughness (Ra) of the plating original plate (underlying steel plate) is increased, the smudge resistance is improved. However, since the surface roughness (Ra) also affects the appearance and weldability of the product and has become a product standard, changing the surface roughness (Ra) alone may provide sufficient smudge resistance. It turned out to be difficult. As a result of further studies, it was found that not only the surface roughness (Ra) of the plating original plate but also the shape of the roughness peak is important, and the present invention has been completed.

すなわち、本発明は、被めっき面の表面粗さ形状が、1.0>Rsk≧0、Ra≧0.2μm(ただし、Ra>0.4μmの範囲を除く)を満たす下地鋼板の上に錫めっきを形成してなることを特徴とする錫めっき鋼板、および、下地鋼板の被めっき面の表面粗さ形状を、1.0>Rsk≧0、Ra≧0.2μm(ただし、Ra>0.4μmの範囲を除く)を満たすように調整し、その後、その下地鋼板の上に錫めっきを形成することを特徴とする錫めっき鋼板の製造方法を提供する。
ただし、Rskは、幅方向に測定した表面スキューネスを示し、Raは算術平均粗さを示す。
That is, according to the present invention, the surface roughness shape of the surface to be plated satisfies 1.0> Rsk ≧ 0, Ra ≧ 0.2 μm (however, excluding the range of Ra> 0.4 μm). The surface roughness of the plated surface of the tin-plated steel sheet and the base steel sheet characterized by forming a plating is 1.0> Rsk ≧ 0, Ra ≧ 0.2 μm (where Ra> 0. The present invention provides a method for producing a tin-plated steel sheet, characterized in that a tin plating is formed on the base steel sheet, and then adjusted so as to satisfy ( excluding the range of 4 μm) .
However, Rsk shows the surface skewness measured in the width direction, and Ra shows the arithmetic average roughness.

スマッジの直接的な発生原因は、ロールなどによる鋼板表面の擦過である。油が耐スマッジ性に有効なのは、鋼板表面の潤滑性が上がることで擦過の程度が弱まっているためと考えられている。また、表面粗さ(Ra)が高いほど耐スマッジ性が良好になるのは、Raが高くなると、物体との接触点が少なくなるためと考えられる。したがって、表面粗さ形状に着目すると、物体による擦過を受けたときに、表面が削れにくい形状が好ましいと考えられる。   The direct cause of smudge is the abrasion of the steel sheet surface with a roll or the like. The reason why oil is effective for smudge resistance is considered to be that the degree of abrasion is weakened due to the increased lubricity of the steel sheet surface. Also, the higher the surface roughness (Ra), the better the smudge resistance, because the higher the Ra, the fewer contact points with the object. Therefore, when focusing on the surface roughness shape, it is considered that a shape in which the surface is difficult to be scraped when scratched by an object is preferable.

そこで、本発明者らは、擦過を受けた部分の疵付き状態を詳細に調べた。その結果、擦過による疵が観察された部分は、粗さピークの頂点のみでなく、頂点近傍まで及んでいることが明らかとなった。また、擦過の程度は、擦過の初期の部分より、後続の部分のほうが酷くなっている様子が観察された。このことは、擦過により発生したスマッジが、研磨剤的な役割を果たしているためではないかと考えた。すなわち、物体との接触は、その初期においては点接触に近い状態であると考えられるが、スマッジを巻き込むことで、擦過幅が増大し、面接触となると同時に、擦過程度が酷くなるという仮説を立てた。この仮説から、粗さ形状を考慮した場合、粗さピークの深さや分布のみではなく、ピークの形状に着目する必要があるという考えに至った。   Therefore, the present inventors have examined in detail the wrinkled state of the part that has been rubbed. As a result, it was clarified that the part in which wrinkles due to scratching were observed extended not only to the peak of the roughness peak but also to the vicinity of the peak. Further, it was observed that the degree of abrasion was more severe in the subsequent part than in the initial part of the abrasion. This was thought to be due to the fact that smudge generated by rubbing plays a role of an abrasive. In other words, it is considered that contact with an object is in a state close to point contact in the initial stage, but by entraining smudge, the rubbing width increases, and at the same time, surface contact occurs, and at the same time, the degree of rubbing process becomes severe. Stood up. This hypothesis has led to the idea that when considering the roughness shape, it is necessary to focus not only on the depth and distribution of the roughness peak, but also on the peak shape.

具体的には、例えば、鋭いピーク形状と、なだらかなピーク形状では、擦過性に差異が生ずるのではないかと考えた。擦過後の表面は、ピーク近傍も疵付いている様子が観察されたが、この場合、鋭いピーク形状であれば、擦過される範囲が狭くなると考えられる。なぜならば、より高い位置にある部分ほど削られやすいからである。鋭いピーク形状であれば、なだらかなピーク形状よりも高い位置に相当する部分の面積が少なくなるはずである。   Specifically, for example, it was considered that there was a difference in scratching between a sharp peak shape and a gentle peak shape. On the surface after rubbing, it was observed that the vicinity of the peak was also scratched, but in this case, if the peak shape is sharp, it is considered that the range of rubbing becomes narrow. This is because the higher the part, the easier it is to cut. If the peak shape is sharp, the area corresponding to the position higher than the gentle peak shape should be reduced.

このようなピーク形状を表す粗さの指標としては、Rsk(スキューネス)やRku(クルトシス)がある。Rskは、粗さ曲線が、下に凸の形状であればRsk>0となり、上に凸の形状であればRsk<0となり、Rskが大きいほど、より尖ったピーク形状となる。   Rsk (skewness) and Rku (kurtosis) are examples of the roughness index representing the peak shape. Rsk is Rsk> 0 if the roughness curve is convex downward, and Rsk <0 if the roughness curve is convex upward. The larger Rsk, the sharper the peak shape.

そこで、本発明者らは、調質圧延条件を様々に振って、耐スマッジ性に影響を及ぼすと考えられるRsk、Rku、Raが異なる種々の表面粗さ形状のめっき原板(下地鋼板)を作製し、これらめっき原板を用いて錫めっき鋼板を作製して、表面粗さ形状と耐スマッジ性との関係を調査した。   Therefore, the present inventors produced various surface roughness-shaped plating original plates (underlying steel plates) with different Rsk, Rku, and Ra, which are considered to affect smudge resistance by varying the temper rolling conditions. Then, a tin-plated steel sheet was prepared using these plated original sheets, and the relationship between the surface roughness shape and smudge resistance was investigated.

その結果、Raが高いほど耐スマッジ性に優れることが確認された。また、RskはRaが0.2μm以上あれば、Rskの増加にともない、耐スマッジ性が向上し、0.2μm未満の場合は、Rskが増加しても耐スマッジ性が向上しない場合があることが確認された。Rkuについては明確な傾向が認められなかった。   As a result, it was confirmed that the higher the Ra, the better the smudge resistance. In addition, if Rsk is 0.2 μm or more, Rsk increases the smudge resistance as Rsk increases, and if Rsk is less than 0.2 μm, the smudge resistance may not improve even if Rsk increases. Was confirmed. No clear tendency was observed for Rku.

さらなる調査の結果、Raが低い場合は、Rskの値に関わらず、擦過痕が全面に観察された。一方、Raが高い領域では、擦過痕はピーク周辺に多く、Rskの増加にともなって、擦過面積が小さくなっていることが確認された。   As a result of further investigation, when Ra was low, scratch marks were observed over the entire surface regardless of the value of Rsk. On the other hand, in the region where Ra is high, there were many scratch marks around the peak, and it was confirmed that the scratch area was reduced as Rsk increased.

この結果は、以下のことを示していると考えられる。すなわち、ある粗さ形状のめっき原板を用いて錫めっき鋼板を製造した場合、Raが小さい場合は、原板粗さピーク(山)と谷の高さレベルが近くなり、ピークの尖り形状が有効に効かない。つまり、谷部が錫で埋め尽くされて、山と谷の差がほとんどなくなってしまった状態と推定される。逆にRaが大きい場合は、粗さピーク(山)と谷の高さレベルが大きく異なるため、山の形状が効いてくる。すなわち、谷部には擦過が及ばず、山部にのみ擦過が起こるが、この場合は、山の形状が尖っているほど、擦過面積が小さくなるということである。ピークの尖り形状の指標であるRkuは、その値が大きくなると、山部のピークは尖るが、谷部の断面積も小さくなるため、錫で埋め尽くされやすくなる。その結果、明瞭な傾向が見られなかったものと解釈することができる。一方Rskは、その値が大きくなると、ピークが尖ると同時に、谷部の断面積も大きくなる。このため、Raの高い領域ではRskの増加に対して耐スマッジ性が良好となる明瞭な傾向を示したものと考えられる。   This result is considered to indicate the following. In other words, when a tin-plated steel sheet is manufactured using a plating raw plate having a certain roughness shape, when Ra is small, the height level of the original plate roughness peak (mountain) and valley is close, and the peak shape of the peak is effective. It does not work. In other words, it is presumed that the valley has been filled with tin, and the difference between the peaks and valleys has almost disappeared. On the other hand, when Ra is large, the height level of the roughness peak (mountain) and the valley is greatly different, so the shape of the mountain is effective. In other words, the trough does not rub, but only the ridges are rubbed. In this case, the sharper the ridge shape, the smaller the rubbed area. When the value of Rku, which is an index of the peak shape of the peak, increases, the peak of the peak portion becomes sharp, but the cross-sectional area of the valley portion also decreases, so that it is easily filled with tin. As a result, it can be interpreted that a clear tendency was not observed. On the other hand, as the value of Rsk increases, the peak becomes sharp and the cross-sectional area of the valley also increases. For this reason, it is considered that the region where Ra is high shows a clear tendency that smudge resistance is good with respect to the increase in Rsk.

以上の検討結果から、めっき原板(下地鋼板)の粗さ形状を、Ra≧0.2μmかつRsk≧0の条件を満たすことにより、耐スマッジ性に優れた錫めっき鋼板が得られることを見出した。   From the above examination results, it was found that a tin-plated steel sheet excellent in smudge resistance can be obtained by satisfying the condition of Ra ≧ 0.2 μm and Rsk ≧ 0 for the roughness shape of the plating base plate (underlying steel plate). .

本発明によれば、調質圧延後の下地鋼板のパラメータの一つであるスキューネス(Rsk)と算術平均粗さ(Ra)を所定の値に制御することで、スマッジの発生を著しく低減した耐スマッジ性の優れた錫めっき鋼板を得ることができる。これにより、ぶりき鋼板に代表される錫めっき鋼板の表面欠陥を防止することができるとともに、めっきラインや、出荷後の客先でのプロセスラインにおけるスマッジ起因の汚れや欠陥の発生を防止することができるので、生産性も向上する。   According to the present invention, by controlling the skewness (Rsk) and the arithmetic average roughness (Ra), which are one of the parameters of the base steel sheet after temper rolling, to predetermined values, the occurrence of smudge is significantly reduced. A tin-plated steel sheet having excellent smudge properties can be obtained. As a result, surface defects of tin-plated steel sheets such as tinplate steel sheets can be prevented, and smudge-induced dirt and defects can be prevented from occurring in plating lines and process lines at customers after shipment. Can improve productivity.

以下、添付図面を参照して本発明の実施の形態について説明する。
代表的な錫めっき鋼板であるぶりき鋼板用の原板(下地鋼板)は、通常、熱間圧延、冷間圧延により所定の厚みに圧延された後、焼鈍により加工ひずみの影響を除去して、調質圧延により機械的性質の調整および表面粗さの調整が行われる。
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
The original plate (base steel plate) for tinplate steel plate, which is a typical tin-plated steel plate, is usually rolled to a predetermined thickness by hot rolling and cold rolling, and then the influence of processing strain is removed by annealing. Mechanical properties and surface roughness are adjusted by temper rolling.

図1は、本発明の表面粗さ形状を得るために用いられる調質圧延機の構成例を示す概略図である。この調質圧延機は、2つの圧延機(以下、圧延スタンドと呼ぶ)5を有する2スタンド連続式の調質圧延機として構成されている。各圧延スタンド5は、一対のワークロール2とそれらを支える一対のバックアップロール3がハウジング4内に収容されてなる4段式のものである。調質圧延されるめっき原板となる鋼板1は左方から右方に向かって連続的に供給されて圧延される。圧延はドライ(潤滑油を供給しない状態)あるいはウエット(調質圧延液を供給する状態)で行われる。   FIG. 1 is a schematic view showing a configuration example of a temper rolling mill used for obtaining the surface roughness shape of the present invention. This temper rolling mill is configured as a two-stand continuous temper rolling mill having two rolling mills (hereinafter referred to as rolling stands) 5. Each rolling stand 5 is a four-stage type in which a pair of work rolls 2 and a pair of backup rolls 3 supporting them are accommodated in a housing 4. The steel plate 1 that is the plating base plate to be temper-rolled is continuously supplied and rolled from the left to the right. Rolling is performed dry (in a state where no lubricating oil is supplied) or wet (in a state where a tempered rolling liquid is supplied).

ぶりき鋼板の製造プロセスでは、このような2スタンド連続式の調質圧延機が一般的であるが、スタンド数は2スタンドに限られるものではない。また、調質圧延機は、連続焼鈍ライン内に設置されたものでも、焼鈍ラインとは別のライン内に設置されたものでもよい。   Such a 2-stand continuous temper rolling mill is common in the manufacturing process of tinplate steel sheet, but the number of stands is not limited to 2 stands. Further, the temper rolling mill may be installed in a continuous annealing line or installed in a line different from the annealing line.

本実施形態では、調質圧延後の鋼板1の表面粗さにつき鋼板表面二次元プロフィールを接触式粗さ計により測定する。測定距離は助走区間を除き4mm以上(カットオフ値である0.8mmの5倍)であることが望ましい。測定方向は幅方向とするが、長手方向(圧延方向)にも同様に測定するとなお良い。幅方向測定位置は、少なくとも板幅中央付近であることが望ましい。生産の余裕により測定数を増加することには問題はない。長手方向測定位置は、コイルの先端部付近、または尾端部付近であることが望ましいが、同じく生産の余裕により測定数を増加することには問題はない。   In this embodiment, the steel plate surface two-dimensional profile is measured with a contact-type roughness meter for the surface roughness of the steel plate 1 after temper rolling. The measurement distance is desirably 4 mm or more (5 times the cut-off value of 0.8 mm) except for the run-up section. Although the measurement direction is the width direction, it is better to measure in the longitudinal direction (rolling direction) in the same manner. The width direction measurement position is preferably at least near the center of the plate width. There is no problem in increasing the number of measurements due to production margin. The longitudinal measurement position is preferably near the tip or tail of the coil, but there is no problem in increasing the number of measurements due to the margin of production.

以上のようにして測定した表面プロフィールを、JIS B0601(および付随するJIS規格 JIS B0632、B0633、B0651など)に基づき粗さパラメータを求める。通常、算術平均粗さRaは客先より範囲が指定されている。本発明ではRaに加えてスキューネスRskも同時に求める。   The surface profile measured as described above is used to obtain a roughness parameter based on JIS B0601 (and accompanying JIS standards JIS B0632, B0633, B0651, etc.). Usually, the range of the arithmetic average roughness Ra is specified by the customer. In the present invention, skewness Rsk is also obtained in addition to Ra.

Raを客先より指定された範囲に制御しつつ、高Rskとなるように調質圧延条件を調整することが重要である。ぶりき用原板である下地鋼板の調質圧延は、材質条件、硬度(SR:一回冷延材、DR:二回冷延材)等の条件により、スタンド数やその表面粗さ(Raおよび、ダル/円筒研磨)の組み合わせ、ドライ(無潤滑)/ウエット(調質圧延油供給)等、調質圧延条件は種々異なるので、それぞれの条件につき調整することが必要である。   It is important to adjust the temper rolling conditions so as to achieve a high Rsk while controlling Ra within a range specified by the customer. The temper rolling of the base steel plate, which is the tin plate base plate, depends on conditions such as material conditions and hardness (SR: cold-rolled material once, DR: cold-rolled material twice) and the number of stands and its surface roughness (Ra and Ra). The temper rolling conditions such as the combination of dull / cylindrical polishing, dry (non-lubricated) / wet (tempered rolling oil supply), etc. are different, so it is necessary to adjust each condition.

上記調質圧延条件を調整することにより、めっき原板となる下地鋼板の被めっき面の表面粗さ形状を、Rsk≧0、Ra≧0.2μmを満たすように調整する。これにより、良好な耐スマッジ性を得ることができる。なお、Ra<0.2μmの場合にはRskがRsk≧0であっても本発明の範囲外であり、本発明の効果が得られないことは言うまでもない。   By adjusting the temper rolling conditions, the surface roughness shape of the surface to be plated of the base steel plate to be the plating original plate is adjusted so as to satisfy Rsk ≧ 0 and Ra ≧ 0.2 μm. Thereby, favorable smudge resistance can be obtained. In the case of Ra <0.2 μm, it goes without saying that even if Rsk is Rsk ≧ 0, it is outside the scope of the present invention, and the effects of the present invention cannot be obtained.

ダルロールを用いる場合には、ダルロールの表面をポリッシング処理する方法(特開昭62−238003号公報)、伸び率を非常に大きくとる方法(特開平03−281756号公報)、円筒研磨ロールでは、回転処理によりロールの凸部を平らにする方法(特開平09−262603号公報)などが公知となっている。   In the case of using a dull roll, a method of polishing the surface of the dull roll (Japanese Patent Laid-Open No. 62-238003), a method of taking a very high elongation rate (Japanese Patent Laid-Open No. 03-281756), A method of flattening the convex portion of the roll by processing (Japanese Patent Laid-Open No. 09-262603) is known.

スマッジに対してはRsk≧0でその値が大きいほど好ましく、その上限は存在しない。しかし、調質圧延において、Rskを鋼板表面算術平均粗さRaと無関係に変化させることは困難であり、製品の鋼板表面粗さが規定されるという観点から、測定時のばらつきを考慮しても、実際にはRsk<1.0である。   For smudge, it is preferable that Rsk ≧ 0 and the value is larger, and there is no upper limit. However, in temper rolling, it is difficult to change Rsk regardless of the steel sheet surface arithmetic average roughness Ra, and from the viewpoint that the steel sheet surface roughness of the product is specified, even when variations in measurement are taken into account Actually, Rsk <1.0.

図1に示す調質圧延機を用いて、板厚0.2mm、板幅900mmの低炭素鋼板を調質圧延した。潤滑状態はドライとした。第1スタンドのワークロールはショットダルでロール粗さをRa=0.7〜0.8μmとし、第2スタンドのワークロールは円筒研磨でロール粗さをRa=0.4〜0.5μmとした。   A temper rolling machine shown in FIG. 1 was used to temper and roll a low carbon steel plate having a thickness of 0.2 mm and a width of 900 mm. The lubrication state was dry. The work roll of the first stand is shot dull and the roll roughness is Ra = 0.7 to 0.8 μm, and the work roll of the second stand is cylindrical polished and the roll roughness is Ra = 0.4 to 0.5 μm. .

表1に示すように、各スタンドの圧延荷重を調整し、調質圧延後の低炭素鋼板コイル先端部、幅方向中央にて、カットオフ0.8mm、測定距離4mm、助走および後走0.4mmで幅方向の表面二次元プロフィールを測定し、算術平均粗さRaおよびスキューネスRskを求めた。測定は5回ずつ行い、それらの平均値を求めた。これらの測定値を同じく表1に示す。   As shown in Table 1, the rolling load of each stand was adjusted, the tip of the low carbon steel plate coil after temper rolling, the center in the width direction, a cutoff of 0.8 mm, a measurement distance of 4 mm, a run and a run. The surface two-dimensional profile in the width direction was measured at 4 mm, and the arithmetic average roughness Ra and the skewness Rsk were obtained. The measurement was performed 5 times, and the average value was obtained. These measured values are also shown in Table 1.

この全コイルを錫めっきし、上記特許文献1の第1表に記載された条件によりクロメート処理を施した。このめっきライン出側(クロメート処理後)において、スマッジの発生状況を目視により観察した。その結果を同様に表1に示した。表1の「耐スマッジ性」の欄において、○は客先(製缶メーカー)に出荷して問題ない表面状態であることを示し、×は客先より表面品質不良として返品される状態であることを示す。   All the coils were tin-plated and subjected to chromate treatment under the conditions described in Table 1 of Patent Document 1 above. On the plating line exit side (after chromate treatment), the occurrence of smudge was visually observed. The results are also shown in Table 1. In the column of “Smudge resistance” in Table 1, ○ indicates that there is no problem in shipping to the customer (can manufacturer), and × indicates that the product is returned as a defective surface quality from the customer. It shows that.

表1において、めっき原板である低炭素鋼板の表面粗さ形状がRa≧0.2μmかつRsk≧0を満たす本発明例では、いずれも耐スマッジ性が良好であるのに対し、この条件から外れる比較例では耐スマッジ性が悪いものとなった。以上の結果から、本発明により耐スマッジ性に優れた錫めっき鋼板が得られることが確認された。   In Table 1, in the present invention example in which the surface roughness shape of the low carbon steel plate which is the plating original plate satisfies Ra ≧ 0.2 μm and Rsk ≧ 0, all of them have good smudge resistance, but deviate from this condition. In the comparative example, the smudge resistance was poor. From the above results, it was confirmed that a tin-plated steel sheet excellent in smudge resistance can be obtained by the present invention.

Figure 0005195271
Figure 0005195271

本発明の表面粗さ形状を得るために用いられる調質圧延機の構成例を示す概略図。Schematic which shows the structural example of the temper rolling mill used in order to obtain the surface roughness shape of this invention.

符号の説明Explanation of symbols

1;鋼板
2;ワークロール
3;バックアップロール
4;ハウジング
5;圧延機(圧延スタンド)
DESCRIPTION OF SYMBOLS 1; Steel plate 2; Work roll 3; Backup roll 4; Housing 5; Rolling mill (rolling stand)

Claims (2)

被めっき面の表面粗さ形状が、1.0>Rsk≧0、Ra≧0.2μm(ただし、Ra>0.4μmの範囲を除く)を満たす下地鋼板の上に錫めっきを形成してなることを特徴とする錫めっき鋼板。
ただし、Rskは、幅方向に測定した表面スキューネスを示し、Raは算術平均粗さを示す。
The surface roughness of the surface to be plated is 1.0> Rsk ≧ 0, Ra ≧ 0.2 μm (however, excluding the range of Ra> 0.4 μm). A tin-plated steel sheet characterized by that.
However, Rsk shows the surface skewness measured in the width direction, and Ra shows the arithmetic average roughness.
下地鋼板の被めっき面の表面粗さ形状を、1.0>Rsk≧0、Ra≧0.2μm(ただし、Ra>0.4μmの範囲を除く)を満たすように調整し、その後、その下地鋼板の上に錫めっきを形成することを特徴とする錫めっき鋼板の製造方法。
ただし、Rskは、幅方向に測定した表面スキューネスを示し、Raは算術平均粗さを示す。
The surface roughness shape of the surface of the base steel plate to be plated is adjusted to satisfy 1.0> Rsk ≧ 0, Ra ≧ 0.2 μm (excluding the range of Ra> 0.4 μm) , and then the base A method for producing a tin-plated steel sheet, comprising forming tin plating on the steel sheet.
However, Rsk shows the surface skewness measured in the width direction, and Ra shows the arithmetic average roughness.
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