JP5614219B2 - Cold rolled steel sheet manufacturing method - Google Patents

Cold rolled steel sheet manufacturing method Download PDF

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JP5614219B2
JP5614219B2 JP2010227701A JP2010227701A JP5614219B2 JP 5614219 B2 JP5614219 B2 JP 5614219B2 JP 2010227701 A JP2010227701 A JP 2010227701A JP 2010227701 A JP2010227701 A JP 2010227701A JP 5614219 B2 JP5614219 B2 JP 5614219B2
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steel sheet
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rolled steel
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木村 幸雄
幸雄 木村
宗康 徳永
宗康 徳永
文吾 舘野
文吾 舘野
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JFE Steel Corp
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Description

本発明は、冷延鋼板の製造方法に関するもので、特に冷間圧延後の製品エッジ部の性状不良および表面疵を防止して、品質が良好な冷延鋼板を安定して製造する方法に関する。   The present invention relates to a method for producing a cold-rolled steel sheet, and more particularly to a method for stably producing a cold-rolled steel sheet having good quality by preventing defective properties and surface flaws at the product edge after cold rolling.

冷延鋼板は、自動車や電機製品、建材などの幅広い用途に用いられる鋼板である。冷間圧延したままの鋼板は、その用途に応じて、めっき処理、焼鈍熱処理、レベラー矯正、プレス加工などの工程を経て最終製品となる。一般に、冷間圧延したままの鋼板では、エッジ部が切り欠け状の性状(耳割れ、耳荒れ、エッジクラックなどとも称される)となりやすく、冷間圧延後のめっきライン、焼鈍ライン、レベラー矯正などでの通板の際、あるいは、冷間圧延そのものにおいて、板破断などの操業トラブルを引き起こしやすく、特に、板厚の薄い鋼板の場合には、冷間圧延中にエッジ性状が悪化して板破断を引き起こし易く、生産性を低下させ易かった。また、板材の最終製品としてエッジ部がそのまま使用される用途では、かえり(バリとも称される)などがない良好なエッジ性状が要求されるのはいうまでもない。そのため、冷間圧延後に鋼板のエッジ部分をトリミングすることが行われているが、冷間圧延して長さが増大した鋼板の全長にわたってトリミングすることは、作業負荷が膨大であるばかりでなく、歩留り低下も招いていた。また、冷延鋼板のトリミングを行った場合、トリミング後のエッジ性状がかえりを有することが多く、プレス加工での疵発生などの原因となっていた。そのため、冷延鋼板の製品エッジ部の性状を良好にする方法について種々の技術が開発されてきた。   A cold-rolled steel sheet is a steel sheet used for a wide range of applications such as automobiles, electrical products, and building materials. The steel sheet that has been cold-rolled becomes a final product through processes such as plating, annealing heat treatment, leveler correction, and press working according to the application. Generally, steel sheets that have been cold-rolled tend to have edge-like properties (also referred to as edge cracks, edge roughness, edge cracks, etc.), and plating lines, annealing lines, and leveler correction after cold rolling. It is easy to cause operational troubles such as plate breakage when passing through the plate or in cold rolling itself. Especially in the case of a thin steel plate, the edge properties deteriorate during cold rolling and the plate It was easy to cause breakage and to reduce productivity. Needless to say, in applications where the edge portion is used as it is as the final product of the plate material, good edge properties without burr (also referred to as burr) are required. Therefore, trimming the edge portion of the steel sheet after cold rolling has been performed, but trimming over the entire length of the steel sheet increased in length by cold rolling, not only the work load is enormous, Yield decline was also invited. Further, when trimming a cold-rolled steel sheet, the edge property after trimming often has a burr, which has been a cause of wrinkles in press working. For this reason, various techniques have been developed for improving the properties of the product edge portion of a cold-rolled steel sheet.

特許文献1では、冷延鋼帯でのエッジ性状の悪化を防止するために、冷間圧延前の熱延鋼帯のエッジ部をトリミングした後、グラインダーやバイトによる機械加工によってトリミングによる加工硬化部分を除去する方法を開示している。
特許文献2では、帯状金属板端部をトリミングした後、帯状金属板端部の上下の角部にホーニング加工を施し、上下の角部に丸みを付与する方法を開示している。
In Patent Document 1, in order to prevent deterioration of the edge properties in the cold-rolled steel strip, after the edge portion of the hot-rolled steel strip before cold rolling is trimmed, the work hardened portion by trimming is performed by machining with a grinder or a bite. Is disclosed.
Patent Document 2 discloses a method of trimming the end portions of the strip-shaped metal plate, then honing the upper and lower corner portions of the end portions of the strip-shaped metal plate, and rounding the upper and lower corner portions.

また、特許文献3では、冷間圧延を施して、総圧下率が50%以上になった時点で帯状金属板端部を少なくとも1回以上研削し、その後更に総圧下率80%以上で冷間圧延を行う方法を開示している。   Further, in Patent Document 3, when cold rolling is performed, the end of the strip metal plate is ground at least once when the total reduction rate becomes 50% or more, and then the cold reduction is further performed at a total reduction rate of 80% or more. A method of rolling is disclosed.


特開昭54−124857号公報JP 54-124857 A 特開昭61−209703号公報JP-A 61-209703 特開平2−290603号公報JP-A-2-290603

上述のように、冷延鋼板のエッジ部の性状が良好であることは製造工程上および製品品質上、極めて重要である。
特許文献1で開示された方法を適用した場合、冷間圧延前の熱延鋼帯のエッジ部をトリミングした後、さらにグラインダーやバイトによる機械加工によってトリミングによる加工硬化部分を除去するという工程が必要となるために、作業能率が著しく低下するという問題がある。一般に、このような機械加工の工程における通板速度は、トリミングや冷間圧延での通板速度に対して著しく遅いため、これらグラインダーやバイトによる機械加工をオンラインで行うことができず、別のオフライン工程が必要となる。また、グラインダーやバイトなどの機械加工によって、エッジ部の一部を除去した場合には、除去部分が切り屑として発生するため、鋼板上へ飛散して表面品質の低下の原因になるという問題も生じやすい。
As described above, good quality of the edge portion of the cold-rolled steel sheet is extremely important in terms of manufacturing process and product quality.
When the method disclosed in Patent Document 1 is applied, after the edge portion of the hot-rolled steel strip before cold rolling is trimmed, a step of removing the work-hardened portion by trimming by machining with a grinder or a bit is necessary. Therefore, there is a problem that the work efficiency is remarkably lowered. In general, the threading speed in such a machining process is significantly slower than the threading speed in trimming and cold rolling, so machining with these grinders and tools cannot be performed online. An offline process is required. In addition, when a part of the edge part is removed by machining such as a grinder or a bite, the removed part is generated as chips, so that it may be scattered on the steel plate and cause deterioration of the surface quality. Prone to occur.

特許文献2で開示された方法を適用した場合も同様の問題が生じ、ホーニング加工によって帯状金属板端部の上下の角部に丸みをもたせるような除去加工は、通板速度に比べて著しく遅いため作業能率が低下するという問題がある。また、ホーニング加工に使用した固体粒子が飛散して、金属板表面に残留すると、表面に押込み疵を発生させるため、表面品質の低下の原因となる。   When the method disclosed in Patent Document 2 is applied, the same problem occurs, and removal processing that rounds the upper and lower corners of the end of the strip-shaped metal plate by honing processing is significantly slower than the plate passing speed. Therefore, there is a problem that work efficiency is lowered. Further, if the solid particles used in the honing process are scattered and remain on the surface of the metal plate, indentation flaws are generated on the surface, which causes deterioration of the surface quality.

さらに、特許文献3で開示された方法を適用する場合には、総圧下率が50%以上の冷間圧延を施した後に、帯状金属板端部を少なくとも1回以上研削する必要があるため、タンデム圧延のように連続スタンドによる生産が困難であり、追加工程を必要とするため、作業能率が低下するという問題が生じる。
以上のように、従来は、帯状金属板端部のトリミング後に付加的な加工を鋼板エッジ部に施すか、冷間圧延の途中で機械加工を施すかのいずれかしか、エッジ性状が良好な冷延鋼板を製造する技術は見当たらなかった。
Furthermore, when applying the method disclosed in Patent Document 3, it is necessary to grind the end of the strip-shaped metal plate at least once after performing cold rolling with a total rolling reduction of 50% or more. As in tandem rolling, production by a continuous stand is difficult, and an additional process is required, resulting in a problem that work efficiency is lowered.
As described above, conventionally, only the edge processing of the steel plate edge after the trimming of the end portion of the strip-shaped metal plate or the machining during the cold rolling is performed. There was no technology for producing rolled steel sheets.

そこで、本発明は、特に冷間圧延後の製品エッジ部の性状不良を防止して、品質が良好な冷延鋼板を安定して製造する方法を提供することを目的とする。   Therefore, an object of the present invention is to provide a method for stably producing a cold-rolled steel sheet having a good quality by preventing a defective property of a product edge part after cold rolling.

本発明は、前記課題を解決するための手段であって、その要旨構成は、熱間圧延後の、C≦0.010%でかつC+N≦0.012%、Si≦0.01%、Mn≦0.15%、P≦0.02%、S≦0.020%、残部がFeおよび不可避的不純物からなる低炭素鋼板を酸洗した後に冷間圧延して所定の寸法の冷延鋼板を製造する方法において、前記酸洗した後前記冷間圧延するに、鋼板のエッジ部をトリミングする際に、トリマー装置のクリアランスGを鋼板の板厚hに対して、G/hが0.15以上、0.25以下の条件にてトリミングを行った後、冷間圧延の各パスの圧延荷重を、全パス中での最大値に対する最小値の比率が0.75以上となるように設定し、総圧下率85%以上の冷間圧延を施すことを特徴とする冷延鋼板の製造方法である。 The present invention is a means for solving the above-mentioned problems, the gist of which is C ≦ 0.010% and C + N ≦ 0.012%, Si ≦ 0.01%, Mn after hot rolling. ≦ 0.15%, P ≦ 0.02%, S ≦ 0.020%, a low-carbon steel sheet consisting of Fe and unavoidable impurities in the balance is pickled, and then cold-rolled to obtain a cold-rolled steel sheet having a predetermined size. a method for producing, prior to rolling the cold after the pickling, when trimming the edge portion of the steel plate, the clearance G of the trimmer device against steel plate thickness h, G / h 0.15 As described above, after trimming under the condition of 0.25 or less, the rolling load of each cold rolling pass is set so that the ratio of the minimum value to the maximum value in all passes is 0.75 or more. Manufacturing a cold-rolled steel sheet, which is cold-rolled with a total rolling reduction of 85% or more It is the law.

本発明によれば、冷間圧延における総圧下率が大きくても、冷間圧延後の製品エッジ部の性状不良を防止して品質が良好な冷延鋼板を安定して製造することが可能となる。   According to the present invention, even if the total rolling reduction in cold rolling is large, it is possible to stably produce a cold-rolled steel sheet having good quality by preventing defective properties of the product edge portion after cold rolling. Become.

冷間タンデム圧延における各スタンドの圧延荷重パターンの例を示す線図Diagram showing examples of rolling load patterns for each stand in cold tandem rolling 冷延鋼板においてエッジ部が切り欠け状の性状(耳割れ、耳荒れ、エッジクラックなどとも称される)になった状態を示す模式図Schematic diagram showing a state in which the edge portion of the cold-rolled steel sheet has a notch-like property (also referred to as an ear crack, rough ear, or edge crack). トリマー装置の1例を示す模式図Schematic diagram showing an example of a trimmer device 図3の部分拡大図Partial enlarged view of FIG. 本発明の実施に用いられる冷延鋼板製造設備の1例を示す模式図The schematic diagram which shows an example of the cold-rolled steel plate manufacturing equipment used for implementation of this invention

本発明が対象とする冷延鋼板は、主として低炭素鋼又は極低炭素鋼の鋼板であり、主として建材用途に使用される鋼板を対象とする。冷延鋼板の板厚については特に制限はないものの、主として0.1〜0.3mm程度の薄物材を対象とする。冷間圧延での総圧下率が大きく、鋼板エッジ部の性状不良が発生しやすい条件だからである。
前記鋼板エッジ部の性状不良とは、図2に模式的に示すように、冷間圧延後の鋼板1のエッジ部が切り欠け状の性状(耳割れ、耳荒れ、エッジクラックなどとも称される)になる状態をいう。冷間圧延中に、このようなエッジ部の性状不良が発生すると、板破断が起きやすく安定して圧延することが難しくなる。また、冷間圧延後に残留すると、次工程のプレスなどにおいて疵を発生させやすく問題である。
The cold-rolled steel sheet targeted by the present invention is mainly a low-carbon steel or extremely low-carbon steel sheet, and is mainly intended for steel sheets used for building materials. Although there is no restriction | limiting in particular about the plate | board thickness of a cold-rolled steel plate, it mainly targets the thin material about 0.1-0.3 mm. This is because the total rolling reduction in cold rolling is large, and the property of the steel plate edge portion is likely to occur.
As shown schematically in FIG. 2, the poor quality of the steel plate edge portion is called a shape in which the edge portion of the steel plate 1 after cold rolling is notched (ear cracks, rough ears, edge cracks, etc.). ). If such edge defects occur during cold rolling, plate breakage tends to occur and it becomes difficult to perform stable rolling. Moreover, if it remains after cold rolling, it is a problem that wrinkles are likely to occur in the press of the next process.

熱間圧延後の鋼板は、酸洗によって脱スケールが行われた後に、トリマー装置によって鋼板端部のトリミングが行われる場合がある。トリマー装置では、図3に示すように、冷間圧延前の鋼板のエッジ部に対して、上下対の円形回転刃を上下から所定の深さまで押し当てて、切断する。ここで、1は鋼板、1A、1Bはトリミングによって切り捨てられる部分(エッジ切捨て部)、10A、10Bはそれぞれ両端部の上側の回転刃、11A、11Bはそれぞれ下側の回転刃を示している。回転刃の設定方法について詳細に説明するため、図4に、片側の回転刃10A、11Aを拡大した図を示す。図4において、Gは、上下の回転刃の水平方向の間隙(クリアランスという)であり、両者の間隙が開く方を正(+)とする。Lは、上下の回転刃10Aと11Aの垂直方向の重なり量(ラップとも称す)であり、上下回転刃の重なり量が大きくなる方を正(+)とする。   The steel sheet after hot rolling may be trimmed by a trimmer device after descaling is performed by pickling. In the trimmer device, as shown in FIG. 3, a pair of upper and lower circular rotary blades are pressed from the upper and lower sides to a predetermined depth against the edge portion of the steel sheet before cold rolling, and cut. Here, 1 is a steel plate, 1A and 1B are portions to be cut off by trimming (edge cut-off portions), 10A and 10B are upper rotary blades at both ends, and 11A and 11B are lower rotary blades, respectively. In order to explain the setting method of the rotary blade in detail, FIG. 4 shows an enlarged view of the rotary blades 10A and 11A on one side. In FIG. 4, G is a horizontal gap (referred to as clearance) between the upper and lower rotary blades, and the direction in which the gap between the two opens is positive (+). L is an amount of overlap (also referred to as a wrap) in the vertical direction between the upper and lower rotary blades 10A and 11A, and a direction in which the amount of overlap between the upper and lower rotary blades becomes larger is positive (+).

本発明においては、トリマー装置のクリアランスGを鋼板の板厚hに対して、G/hが0.15以上、0.25以下の条件にてトリミングを行う。トリミング後の板端部には、せん断面と破断面が形成されるが、クリアランスが小さい場合にはせん断面の面積比率が増加するものの、せん断面と破断面の境界部の凹凸が大きくなり、G/hが0.15未満では冷間圧延後にエッジ性状が悪化しやすいからである。一方、クリアランスが過大となるとせん断面と破断面の境界部の凹凸は低減するものの、破断面の端部に形成されるかえりが大きくなり、G/hが0.25を超えると、かえりの部分を起点として冷間圧延後のエッジ性状が悪化してしまうからである。   In the present invention, trimming is performed on the condition that the clearance G of the trimmer device is G5 / h is 0.15 or more and 0.25 or less with respect to the plate thickness h of the steel plate. At the edge of the plate after trimming, a shear surface and a fracture surface are formed, but if the clearance is small, the area ratio of the shear surface increases, but the unevenness at the boundary between the shear surface and the fracture surface increases. This is because if G / h is less than 0.15, the edge properties are likely to deteriorate after cold rolling. On the other hand, if the clearance is excessive, the unevenness at the boundary between the shear plane and the fractured surface is reduced, but the burr formed at the end of the fractured surface becomes larger, and when G / h exceeds 0.25, the burred part This is because the edge property after cold rolling deteriorates starting from.

さらに、本発明に係る冷間圧延は、タンデム式の多スタンド圧延またはレバース圧延等の、2パス以上のパス数を要する多パス圧延を対象とする。その際、冷間圧延前の板厚から、所定の板厚まで圧下する場合に、1パスごとの圧延荷重を算出または過去の荷重データから設定するが、そのとき、全パス中の圧延荷重の最大値に対する最小値の比率が0.75以上,1.00以下となる条件が満たされるように圧延荷重を設定して圧延を行う。1パスごとあるいは1スタンドごとの圧延荷重が大きく変化すると冷間圧延時に鋼板エッジ部に生じる引張応力が過大に生じて、冷間圧延前に形成されたせん断面と破断面の境界部の凹凸又はかえりの部分を起点として、エッジ性状が悪化しやすいからである。   Furthermore, the cold rolling according to the present invention is intended for multi-pass rolling that requires two or more passes, such as tandem multi-stand rolling or lever rolling. At that time, when rolling down from the plate thickness before cold rolling to a predetermined plate thickness, the rolling load for each pass is calculated or set from past load data, but at that time, the rolling load in all passes Rolling is performed by setting the rolling load so that the condition that the ratio of the minimum value to the maximum value is 0.75 or more and 1.00 or less is satisfied. If the rolling load for each pass or stand changes greatly, the tensile stress generated at the edge of the steel plate during cold rolling will be excessive, resulting in irregularities at the boundary between the shear surface and the fracture surface formed before cold rolling or This is because the edge property tends to deteriorate starting from the burr portion.

これは、冷間圧延において鋼板エッジ部に生じる引張応力は、ロールの幅方向たわみと偏平量の幅方向分布、鋼板の幅方向厚みが影響し、鋼板端部のパスごとのエッジドロップ比率変化に依存して、ロールバイト入側のエッジドロップが大きい鋼板をロール偏平が生じにくい低荷重で圧延する場合に鋼板エッジ部の引張応力が過大となるため、そのような鋼板エッジ部の引張応力を低減しながら圧延を行う必要があるからである。また、ロールバイト出側のエッジドロップ量は、ロールバイト入側のエッジドロップ量が一定程度影響するため、多パス圧延におけるいずれかのパスにおいて鋼板幅方向端部に大きなエッジドロップを形成させると、その鋼板形状によって、ロールが鋼板幅方向最端部まで接触しなくなり、板幅方向最端部が板中央部に比べて変形しないため、その後のいずれかの圧延パスにおいて鋼板エッジ部に過大な引張応力が生じることになる。一方、エッジドロップはそのパスの圧延荷重に左右されやすい。そのため、本発明では全パスに渡って圧延荷重がほぼ一定の範囲に収まるように圧延パススケジュールを選択し、多パス圧延の任意のパスにおいて鋼板エッジ部に過大な引張応力が負荷されるのを抑制する。   This is because the tensile stress generated at the edge of the steel plate during cold rolling is affected by the deflection in the width direction of the roll, the width direction distribution of the flat amount, and the thickness in the width direction of the steel plate. Depending, when rolling a steel sheet with a large edge drop on the roll bite entry side at a low load where roll flatness is unlikely to occur, the tensile stress at the steel sheet edge becomes excessive, reducing the tensile stress at the steel sheet edge. This is because it is necessary to perform rolling. Moreover, since the amount of edge drop on the roll bite exit side affects the amount of edge drop on the roll bite entry side to a certain extent, when a large edge drop is formed at the end in the steel plate width direction in any pass in multi-pass rolling, Due to the shape of the steel plate, the roll does not come into contact with the end of the steel sheet in the width direction, and the end of the width direction of the plate does not deform as compared with the center of the plate. Stress will occur. On the other hand, the edge drop is easily influenced by the rolling load of the path. For this reason, in the present invention, a rolling pass schedule is selected so that the rolling load falls within a substantially constant range over all passes, and an excessive tensile stress is applied to the edge of the steel plate in any pass of multi-pass rolling. Suppress.

なお、ここでは冷間圧延における総圧下率(略して冷延総圧下率)は85%以上とする。冷延総圧下率が85%未満の条件では、本来的に鋼板エッジ部の性状が悪化しにくいから問題とならないためである。一方、冷延総圧下率の上限については、エッジ性状の面からは上限はないが、工業的に実施されている冷間圧延における総圧下率は95%程度が上限であるので、本発明の適用上の上限も95%とした。   Here, the total rolling reduction in cold rolling (abbreviated as cold rolling total rolling reduction) is 85% or more. This is because under the condition that the total cold rolling reduction is less than 85%, the properties of the steel plate edge portion are inherently unlikely to deteriorate, so that there is no problem. On the other hand, the upper limit of the cold rolling total rolling reduction is not an upper limit from the aspect of edge properties, but the total rolling reduction in cold rolling practiced industrially is about 95%, so the upper limit of the present invention is The upper limit for application was also 95%.

本発明について、5スタンドから構成される冷間タンデム圧延機にて冷延鋼板を製造した例を用いて、詳細に説明する。
図5は、本発明による、冷間タンデム圧延機にて冷延鋼板を製造する工程の一部を模式的に示した図である。図5において、1は冷延鋼板であり、21はトリマー装置、22は通板中の鋼板に付与される張力を制御するためのブライドルロール、23は4段圧延ロールスタンドを5スタンド直列に配置してなる冷間タンデム圧延機、24は圧延後の冷延鋼板を巻き取ったコイルである。図5において、鋼板1は矢印の向きに通板され、図中に示していない上流側には、熱延コイルまたは酸洗コイルを払い出すためのペイオフリール、先行材の尾端と後行材の先端をつなぎ合わせるための溶接装置、溶接中の通板速度調整をするためのルーパー部、熱延コイルの場合は鋼板表面の酸化鉄(スケール)を除去するための酸洗セクションなどが配置されている。なお、本発明例での冷間タンデム圧延機のワークロール径は5スタンドとも500mmとした。
The present invention will be described in detail using an example in which a cold-rolled steel sheet is manufactured by a cold tandem rolling mill composed of 5 stands.
FIG. 5 is a view schematically showing a part of a process for producing a cold-rolled steel sheet by a cold tandem rolling mill according to the present invention. In FIG. 5, 1 is a cold-rolled steel plate, 21 is a trimmer device, 22 is a bridle roll for controlling the tension applied to the steel plate being threaded, and 23 is a 5-stage rolling roll stand arranged in series. A cold tandem rolling mill 24, which is a coil wound around a rolled cold-rolled steel sheet. In FIG. 5, a steel plate 1 is passed in the direction of the arrow, and on the upstream side not shown in the figure, a payoff reel for delivering a hot-rolled coil or pickling coil, a tail end of a preceding material, and a succeeding material A welding device for joining the tips of the steel, a looper part for adjusting the plate passing speed during welding, and a pickling section for removing iron oxide (scale) on the surface of the steel sheet in the case of a hot rolled coil ing. In addition, the work roll diameter of the cold tandem rolling mill in the example of the present invention was 500 mm for all 5 stands.

トリマー装置21は、鋼板の両エッジ側に円形回転刃が配置されており、図4に示すように刃のクリアランスGおよびラップLを調整することが可能である。
本発明例では、厚みが2.0mmで幅が1020mmの熱延鋼板から、厚みが0.2mmで幅が1000mmの冷延鋼板を製造する例について説明する。なお、鋼板はC≦0.010%でかつC+N≦0.012%、Si≦0.01%、Mn≦0.15%、P≦0.02%、S≦0.020%、残部がFeおよび不可避的不純物からなる鋼である。
In the trimmer device 21, circular rotary blades are arranged on both edges of the steel plate, and the clearance G and lap L of the blades can be adjusted as shown in FIG.
In the present invention example, an example in which a cold-rolled steel sheet having a thickness of 0.2 mm and a width of 1000 mm is manufactured from a hot-rolled steel sheet having a thickness of 2.0 mm and a width of 1020 mm will be described. The steel sheet has C ≦ 0.010% and C + N ≦ 0.012%, Si ≦ 0.01%, Mn ≦ 0.15%, P ≦ 0.02%, S ≦ 0.020%, and the balance is Fe. And steel consisting of inevitable impurities.

ペイオフリールから払い出された熱延鋼板は、酸洗セクションで表面スケールが除去されたのち、両側のエッジ部をそれぞれ10mmずつトリミングされる。ここで、本発明例でのトリミングは、トリマー装置21において、クリアランスGを0.4mmに、ラップLを0.3mmに設定した。クリアランスGと板厚hの比は0.20とした。
そして、両エッジをトリミングして幅が1000mmになった2mm厚の酸洗済みの熱延鋼板を、5スタンドの冷間タンデム圧延機23で、0.2mm厚まで圧延した。各スタンドの圧下率は、全スタンドにわたり圧延荷重の最大値と最小値の比率が0.75以上になるように設定した。図1は、図5の冷間タンデム圧延機の各スタンドの圧延荷重の例を示したものである。冷間圧延中の鋼板の幅変化は無視できる程度に小さいため、単位幅あたりの圧延荷重で表記している。図中の例1(従来例)では、第2スタンドの圧延荷重が最も大きく、第5スタンドの圧延荷重が最小となり、その比率は0.64となっている。一方、図中の例2(本発明例)では、最大荷重に対する最小荷重の比率が0.86となっており、本発明では、このような圧延荷重パターンとなるように各スタンドの圧下率配分を決定する。
The hot-rolled steel sheet paid out from the payoff reel is trimmed by 10 mm on both edge portions after the surface scale is removed in the pickling section. Here, the trimming in the example of the present invention was performed by setting the clearance G to 0.4 mm and the lap L to 0.3 mm in the trimmer device 21. The ratio between the clearance G and the plate thickness h was 0.20.
Then, both edges were trimmed and the pickled hot-rolled steel sheet having a thickness of 1000 mm was rolled to a thickness of 0.2 mm by a 5-stand cold tandem rolling mill 23. The reduction ratio of each stand was set so that the ratio of the maximum value and the minimum value of the rolling load over all the stands was 0.75 or more. FIG. 1 shows an example of the rolling load of each stand of the cold tandem rolling mill of FIG. Since the change in the width of the steel sheet during cold rolling is so small that it can be ignored, the rolling load per unit width is indicated. In Example 1 (conventional example) in the figure, the rolling load of the second stand is the largest, the rolling load of the fifth stand is the smallest, and the ratio is 0.64. On the other hand, in Example 2 (example of the present invention) in the figure, the ratio of the minimum load to the maximum load is 0.86, and in the present invention, the reduction ratio distribution of each stand so as to have such a rolling load pattern. To decide.

なお、このような条件で冷間圧延したままの鋼板について、長手方向で任意に10箇所を選んで、エッジ部の性状を調査したが、いずれの箇所においてもエッジクラックは0.1mm未満と極めて小さく、エッジ性状は良好であった。
なお、図5に示したような、トリミング工程とその後の冷間圧延工程が直結した製造装置では、従来技術であるグラインダーやバイトなどの機械加工を適用しようとすると、通板速度が著しく律速されるため、生産効率が低下する。また、これら機械加工で生じた切り屑が鋼板上へ巻き込まれたまま冷間圧延され、表面品質の低下の原因になる危険性が極めて高くなるため、前記機械加工の適用は不可能であった。
In addition, about the steel plate which has been cold-rolled under such conditions, 10 locations were arbitrarily selected in the longitudinal direction, and the properties of the edge portion were investigated, but the edge crack was extremely less than 0.1 mm in any location. Small and good edge properties.
In addition, in the manufacturing apparatus in which the trimming process and the subsequent cold rolling process are directly connected as shown in FIG. 5, when the conventional machining such as a grinder or a bite is applied, the sheet passing speed is significantly limited. Therefore, production efficiency is reduced. In addition, since the chips generated by the machining are cold-rolled while being wound on the steel sheet, the risk of lowering the surface quality becomes extremely high, so the application of the machining is impossible. .

以上説明したように、本発明によれば、冷間圧延後の製品エッジ部の性状が良好な冷延鋼板の製造方法を提供することが可能になる。   As described above, according to the present invention, it is possible to provide a method for manufacturing a cold-rolled steel sheet having good properties at the product edge after cold rolling.

本発明の実施例として、図5に示す5スタンドからなる冷間タンデム圧延機での冷延鋼板の製造に本発明を適用した例について説明する。
供試材は、一般的な冷延鋼板である低炭素鋼の母板となる熱延鋼板である。母板厚1.8〜2.6mmであり、冷間圧延後の厚みは0.12〜0.30mmである。
実施条件を表1に示す。酸洗後の母板の板端部をトリマー装置21によってトリミングする際のクリアランスGを変更すると共に、冷間圧延における最大荷重と最小荷重の比を変更している。なお、トリミング時のラップLはいずれの条件においても0.3mmで一定とした。
As an embodiment of the present invention, an example in which the present invention is applied to the production of a cold-rolled steel sheet in a cold tandem rolling mill having five stands shown in FIG. 5 will be described.
The test material is a hot-rolled steel plate that is a base plate of a low-carbon steel that is a general cold-rolled steel plate. The base plate thickness is 1.8 to 2.6 mm, and the thickness after cold rolling is 0.12 to 0.30 mm.
Implementation conditions are shown in Table 1. While changing the clearance G at the time of trimming the edge part of the mother board after pickling with the trimmer device 21, the ratio of the maximum load to the minimum load in the cold rolling is changed. Note that the lap L during trimming was constant at 0.3 mm under any conditions.

エッジ性状の評価として、冷間圧延したままの鋼板について、長手方向で任意に10箇所を選んでエッジ部の性状を調査した。いずれの箇所においてもエッジクラックは0.1mm未満であれば良好、1箇所でも0.1mm以上の部分があれば不良とした。
表1に示すように、比較例9〜17ではエッジ性状が不良であったのに対し、本発明例1〜8ではいずれもエッジ性状が良好であった。
As an evaluation of the edge properties, the properties of the edge portions were investigated by arbitrarily selecting 10 locations in the longitudinal direction of the steel sheets that had been cold-rolled. In any part, the edge crack was good if it was less than 0.1 mm, and if there was a part of 0.1 mm or more even in one place, it was considered bad.
As shown in Table 1, the edge properties were poor in Comparative Examples 9 to 17, while the edge properties were all good in Invention Examples 1 to 8.

Figure 0005614219
Figure 0005614219

1 鋼板
1A、1B トリミングにより切り捨てる部分
10A、10B 上側の回転刃
11A、11B 下側の回転刃
21 トリマー装置
22 ブライドルロール
23 冷間タンデム圧延機
24 巻き取りコイル
DESCRIPTION OF SYMBOLS 1 Steel plate 1A, 1B The part 10A, 10B to cut off by trimming Upper rotary blade 11A, 11B Lower rotary blade 21 Trimmer device 22 Bridle roll 23 Cold tandem rolling mill 24 Winding coil

Claims (1)

熱間圧延後の、C≦0.010%でかつC+N≦0.012%、Si≦0.01%、Mn≦0.15%、P≦0.02%、S≦0.020%、残部がFeおよび不可避的不純物からなる低炭素鋼板を酸洗した後に冷間圧延して所定の寸法の冷延鋼板を製造する方法において、前記酸洗した後前記冷間圧延するに、鋼板のエッジ部をトリミングする際に、トリマー装置のクリアランスGを鋼板の板厚hに対して、G/hが0.15以上、0.25以下の条件にてトリミングを行った後、冷間圧延の各パスの圧延荷重を、全パス中での最大値に対する最小値の比率が0.75以上となるように設定し、総圧下率85%以上の冷間圧延を施すことを特徴とする冷延鋼板の製造方法。 After hot rolling , C ≦ 0.010% and C + N ≦ 0.012%, Si ≦ 0.01%, Mn ≦ 0.15%, P ≦ 0.02%, S ≦ 0.020%, balance a method but for producing a cold-rolled steel sheet having predetermined dimensions and cold rolled after pickling low-carbon steel sheet consisting of Fe and unavoidable impurities, prior to rolling the cold after the pickling, the steel sheet edge When trimming the part, the clearance G of the trimmer device is trimmed on the condition that G / h is 0.15 or more and 0.25 or less with respect to the plate thickness h of the steel plate, Cold rolled steel sheet, characterized in that the rolling load of the pass is set so that the ratio of the minimum value to the maximum value in all passes is 0.75 or more, and cold rolling is performed with a total reduction ratio of 85% or more. Manufacturing method.
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