JP2007291472A - Method for producing hot dip galvannealed steel strip - Google Patents
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Abstract
Description
本発明は、合金化溶融亜鉛メッキ鋼帯の製造方法に関するものである。 The present invention relates to a method for producing an alloyed hot-dip galvanized steel strip.
溶融合金化亜鉛メッキ鋼板の製造方法としては、一般に溶融亜鉛メッキ後のメッキ鋼板を加熱してメッキ層中へ熱拡散によりメッキ原板の鉄を拡散してＦｅ−Ｚｎ合金メッキ鋼板とするものである。このような製造方法においては合金層の生成を均一にすることが最も重要なことであるが、特に高リン、高マンガン、高シリコン鋼板のごとき、一般に言われるハイテン鋼板（高張力鋼板）は、合金化層の生成が不均一になり品質を著しく劣化させる等の欠点を伴うのである。 As a method for producing a galvannealed steel sheet, generally, a galvanized steel sheet is heated, and iron of the plating base plate is diffused into the plating layer by thermal diffusion to form a Fe-Zn alloy galvanized steel sheet. . In such a production method, it is most important to make the formation of the alloy layer uniform. Particularly, high-tensile steel plates (high-tensile steel plates) generally referred to as high phosphorus, high manganese, high silicon steel plates, This is accompanied by drawbacks such as non-uniform formation of the alloyed layer and significant deterioration in quality.
自動車の外板を中心として、加工性に優れた高張力鋼板が必要とされ、鋼板にＰを添加したものが用いられる。また、自動車や家電、建材の耐食性を向上するため、溶融亜鉛メッキ鋼板が使用されている。特に、経済性と防錆効果、塗装後の性能の良さが評価されて合金化溶融亜鉛メッキ鋼板が広く用いられている。 A high-tensile steel plate excellent in workability is required centering on an automobile outer plate, and a steel plate with P added thereto is used. Moreover, in order to improve the corrosion resistance of automobiles, home appliances, and building materials, hot dip galvanized steel sheets are used. In particular, alloyed hot-dip galvanized steel sheets are widely used because they are evaluated for economic efficiency, rust prevention effect, and good performance after coating.
合金化溶融亜鉛メッキにおいては、鋼板表面においてメッキ時の合金化の程度に不均一が生じ、合金化遅れ部分でメッキ厚が薄くなって線状の模様状欠陥となる場合がある。自動車用の外板として使用する場合に、特にこの模様状欠陥の発生が問題となる。 In alloyed hot dip galvanizing, nonuniformity occurs in the degree of alloying at the time of plating on the surface of the steel sheet, and the plating thickness may be reduced at a portion where alloying is delayed, resulting in a linear pattern defect. When used as an outer panel for automobiles, the occurrence of this pattern defect becomes a problem.
ＰもしくはＳｉ添加鋼を用いた合金化溶融亜鉛メッキ鋼板において線状の疵が発生しやすい原因は、ＰやＳｉが非常に偏析しやすい元素であり、スラブ表面に偏析したＰやＳｉが熱間圧延、冷間圧延によって長手方向に圧延されてコイル表面にＰの濃化層が形成され、このＰやＳｉの濃化層においてメッキ時に合金化が遅れるためであるとされ、そして、Ｐの添加量を０．０５０％以下とすれば、Ｐの粒界偏析、表面濃化に起因する不良を防止できることが知られている。（例えば、特許文献１）
また、Ｐ含有量が０．０３％以上の合金化溶融亜鉛メッキ鋼板の製造において、鋼板表面の不均一性を解消するために鋼板中Ｐ量に応じた研削量で鋼板表面研削を行い、合金化処理を誘導加熱方式の合金化炉で行う方法が知られている。
The reason why linear flaws are likely to occur in alloyed hot-dip galvanized steel sheets using P or Si-added steel is that P and Si are very segregated, and P and Si segregated on the slab surface are hot. Rolling and cold rolling are performed in the longitudinal direction to form a P-enriched layer on the coil surface. In this P- or Si-enriched layer, alloying is delayed at the time of plating. It is known that if the amount is 0.050% or less, defects due to P grain boundary segregation and surface concentration can be prevented. (For example, Patent Document 1)
In addition, in the production of alloyed hot-dip galvanized steel sheets having a P content of 0.03% or more, in order to eliminate the non-uniformity of the steel sheet surface, the steel sheet surface is ground with a grinding amount corresponding to the P content in the steel sheet. There is known a method in which the alloying treatment is performed in an induction heating type alloying furnace.
合金化溶融亜鉛メッキ鋼板の線状の模様状欠陥を防止するため、例えばＰ含有量が０．０３％以上の極低炭Ｔｉ添加鋼板を用いる場合には、連続鋳造鋳片段階で表面を３ｍｍ以上スカーフ除去し、さらにメッキ前の鋼板段階で表面を５μｍ以上研削する。これにより、メッキ後の模様状欠陥発生を防止して表面品質を確保することができる。Ｐ含有量が少ない極低炭Ｔｉ添加鋼板を用いる場合であっても、鋳片段階で表面を３ｍｍ以上スカーフ（溶削）し、重研削ブラシにて鋼板表面を２μｍ以上研削することも知られている。（例えば、特許文献２）
合金化溶融亜鉛メッキ前の鋼板表面の研削方法としては、重研削ブラシロールによりアルカリ性水溶液を吹き付けつつ研削除去する方法が開示されている。（例えば、特許文献３）
冷間圧延された直後の表面鋼板に付着しているカーボンや残留鉄粉の汚れを除去することも加味し、鋼帯表面の研削とブラッシング洗浄の双方を目的としたブラシ設備を備える方法が開示されている。（例えば、特許文献４）
このように鋼帯表面の研削装置は、ブラッシング洗浄装置と兼ねることが従来技術として一般的である。
In order to prevent linear pattern defects in the alloyed hot-dip galvanized steel sheet, for example, when using an ultra-low carbon Ti-added steel sheet having a P content of 0.03% or more, the surface is 3 mm in the continuous cast slab stage. The scarf is removed as described above, and the surface is ground by 5 μm or more in the steel plate stage before plating. As a result, the occurrence of pattern defects after plating can be prevented to ensure surface quality. Even when using an ultra-low carbon Ti-added steel sheet with low P content, it is also known to scarf (melt) the surface at least 3 mm at the slab stage and grind the surface of the steel sheet by 2 μm or more with a heavy grinding brush. ing. (For example, Patent Document 2)
As a method for grinding a steel sheet surface before galvannealing, a method of grinding and removing while spraying an alkaline aqueous solution with a heavy grinding brush roll is disclosed. (For example, Patent Document 3)
Disclosed is a method including brush equipment for both grinding and brushing of the steel strip surface, taking into account the removal of carbon and residual iron powder adhering to the steel sheet immediately after cold rolling. Has been. (For example, Patent Document 4)
As described above, it is general as a conventional technique that the steel strip surface grinding device also serves as a brushing cleaning device.
溶融亜鉛メッキ鋼板の設備列の例としては、例えば、特許文献５に記載されている。圧延機で巻き取られた鋼帯は、溶接後洗浄部を通過し、入側ルーパーを通過して加熱炉以降のメッキ処理をおこなうことが一般的である。入側ルーパー後に洗浄装置を設けると、冷間圧延直後のカーボンや残留鉄粉の汚れの付着した鋼帯が入側ルーパー内の搬送ローラー上に付着し、鋼帯押し疵となって歩留まり落ちを助長する。そのため洗浄装置は入側ルーパー前に設け、研削装置も兼ねるのが一般的である。
本発明は熱処理前にメッキ原板表層部に機械的加工を施し表層部を除去する合金化溶融亜鉛メッキ鋼帯の製造方法において、初期投資を抑え、尚且つ製品歩留まりを向上させるための技術を提供するものである。 The present invention provides a technique for reducing the initial investment and improving the product yield in a method of manufacturing an alloyed hot-dip galvanized steel strip in which the surface layer portion is mechanically processed to remove the surface layer portion before heat treatment. To do.
合金化溶融亜鉛メッキ鋼板の原材料となる鋼帯は、冷間圧延もしくは熱間圧延により圧延処理をされてコイル状に巻き取られた状態になっている。この鋼帯をメッキ目的とする連続ラインで処理するためには、アンコイラーでまきほどされた鋼帯先端を処理設備入側で先行材の尾端と溶接し、焼鈍炉およびその後のメッキ処理処理装置に連続的に送り出される。この溶接作業時は、鋼帯を停止した状態でおこなうが、一方焼鈍炉およびメッキ処理装置で停止すると、その部分の鋼帯は歩留まり落ちしてしまうので、一定の速度で通板する必要がある。材料鋼帯を溶接しているときにも焼鈍炉以降の設備を停止させないために溶接機と焼鈍炉との間には、鋼帯を蓄積するための入側ルーパー設備を設ける。溶接中はアンコイラーからの鋼帯送り出しは停止するため、入側ルーパーに蓄積した鋼帯を焼鈍炉に吐き出す。溶接終了後入側ルーパーへ、アンコイラーから焼鈍炉での通板速度より高速で鋼帯を送り込み吐き出した鋼帯を蓄積する。前記したように洗浄と研削を兼ねた装置が入側ルーパー前にあるので、通板速度が変動する度研削量がばらついてしまう問題があった。特に溶接時に鋼帯が停止すると、その部分をブラシで局所的に過剰に研削してしまうため、縞模様になり製品としては外観不適で前後部分の鋼帯の歩留まり落ちを招くという課題があった。 A steel strip that is a raw material of the alloyed hot-dip galvanized steel sheet is rolled into a coil shape by cold rolling or hot rolling. In order to process this steel strip in a continuous line for plating purposes, the steel strip tip wound by an uncoiler is welded to the tail end of the preceding material on the processing equipment entry side, and an annealing furnace and subsequent plating treatment equipment Are sent out continuously. During this welding operation, the steel strip is stopped. However, if the steel strip is stopped in the annealing furnace and the plating apparatus, the steel strip in that portion will drop in yield, so it is necessary to pass the plate at a constant speed. . In order to prevent the equipment after the annealing furnace from being stopped even when the steel strip is being welded, an entrance-side looper equipment for accumulating the steel strip is provided between the welding machine and the annealing furnace. During welding, the steel strip feeding from the uncoiler stops, so the steel strip accumulated in the inlet looper is discharged into the annealing furnace. After welding is complete, the steel strip is accumulated from the uncoiler to the entrance looper at a speed higher than the plate speed in the annealing furnace. As described above, there is a device that performs both cleaning and grinding in front of the entrance looper. Therefore, there is a problem that the grinding amount varies every time the sheet passing speed fluctuates. In particular, when the steel strip stops during welding, the portion is locally ground excessively with a brush, resulting in a striped pattern and unsuitable appearance as a product, leading to a drop in the yield of the steel strip in the front and rear portions. .
研削装置はブラシで鉄板の表面を削るものであるから強力な駆動モーターが必要であるために初期投資が大きく、消費電力も大きい装置である。また溶接後の入側ルーパーへの鋼帯蓄積時間帯には研削装置での通板速度が焼鈍炉以降の通板速度より一時的に速くする必要がある。研削装置としてはこの一時的に早い速度でも所定の研削量を確保する仕様である必要がある。よって研削装置を入側ルーパーの上流側に設置する従来技術では、さらに初期投資が高く、消費電力も大きくなるという課題があった。 The grinding device is a device that sharpens the surface of the iron plate with a brush, and therefore requires a powerful drive motor. Therefore, the initial investment is large and the power consumption is also large. In addition, during the steel band accumulation time zone on the entry side looper after welding, it is necessary to temporarily increase the plate passing speed in the grinding device than the plate passing speed after the annealing furnace. The grinding apparatus needs to have specifications that ensure a predetermined grinding amount even at a temporarily high speed. Therefore, in the conventional technique in which the grinding apparatus is installed on the upstream side of the entry side looper, there are problems that the initial investment is higher and the power consumption is also increased.
本発明は、かかる課題を解決するために鋭意検討の結果なされたものであり、その要旨とするところは特許請求の範囲に記載した通りの下記内容である。
（１）熱処理前のメッキ原板表層部に機械的加工を施して該表層部を除去する合金化溶融亜鉛メッキ鋼帯の製造方法において、入側ルーパー通過後連続焼鈍処理前に前記メッキ原板表層部に機械的加工を施し、該表層部を除去することを特徴とする合金化溶融亜鉛メッキ鋼帯の製造方法。
（２）熱処理前のメッキ原板表層部に機械的加工を施して該表層部を除去する合金化溶融亜鉛メッキ鋼帯の製造方法において、前記メッキ原板のアルカリ洗浄を入側ルーパー前に施し、該入側ルーパー通過後連続焼鈍処理前に前記メッキ原板表層部に機械的加工を施し、該表層部を除去することを特徴とする合金化溶融亜鉛メッキ鋼帯の製造方法。
（３）熱処理前のメッキ原板表層部に機械的加工を施して該表層部を除去する合金化溶融亜鉛メッキ鋼帯の製造方法において、前記メッキ原板のアルカリ洗浄を入側ルーパー前に施し、該入側ルーパー通過後連続焼鈍処理前に前記メッキ原板表層部にアルカリ洗浄および機械的加工を施し、該表層部を除去することを特徴とする合金化溶融亜鉛メッキ鋼帯の製造方法。
（４）前記メッキ原板表層部における表層片面当たり１〜４ｇ／ｍ２除去することを特徴とする（１）乃至（３）いずれか一項に記載の合金化溶融亜鉛メッキ鋼帯製造方法。
（５）前記メッキ原板は、鋼中Ｓｉ濃度：０．０３〜２．０質量％、もしくは、鋼中Ｐ濃度：０．０３〜０．１質量％であることを特徴とする（１）乃至（４）のいずれか一項に記載の合金化溶融亜鉛メッキ鋼帯の製造方法。
The present invention has been made as a result of intensive studies in order to solve such problems, and the gist thereof is the following contents as described in the claims.
(1) In the method for producing an alloyed hot-dip galvanized steel strip in which the surface layer portion is mechanically processed to remove the surface layer portion before the heat treatment, the surface layer portion of the plating original plate before passing through the entrance looper and before the continuous annealing treatment A method for producing an alloyed hot-dip galvanized steel strip, wherein the surface layer portion is removed by subjecting to mechanical processing.
(2) In the method for producing an alloyed hot-dip galvanized steel strip in which the surface layer part is mechanically processed to remove the surface layer part before the heat treatment, the plating original sheet is subjected to alkali cleaning before the entrance looper, A method for producing an alloyed hot-dip galvanized steel strip, wherein the surface layer portion of the plated original plate is mechanically processed after passing through the entrance looper and before the continuous annealing treatment, and the surface layer portion is removed.
(3) In the method for producing an alloyed hot-dip galvanized steel strip in which the surface layer portion is mechanically processed to remove the surface layer portion before the heat treatment, the plating plate is subjected to alkali cleaning before the entrance looper, A method for producing an alloyed hot-dip galvanized steel strip, characterized by subjecting a surface layer portion of the plating original plate to alkali cleaning and mechanical processing after passing through an entrance side looper and before continuous annealing, and removing the surface layer portion.
(4) The method for producing an alloyed hot-dip galvanized steel strip according to any one of (1) to (3), wherein 1 to 4 g / m 2 is removed per one surface layer in the surface layer portion of the plating original plate.
(5) The plating original plate has an Si concentration in steel: 0.03 to 2.0 mass%, or a P concentration in steel: 0.03 to 0.1 mass% (1) to (1) to (4) The manufacturing method of the galvannealed steel strip as described in any one of (4).
本発明によれば、熱処理前にメッキ原板表層部に機械的加工を施し表層部を除去する溶融合金化亜鉛メッキ鋼帯の製造方法において、初期投資を抑えつつ、消費電力を削減し、歩留まり良好な製品を製造することが可能である。 According to the present invention, in the manufacturing method of a galvannealed steel strip that is mechanically processed to remove the surface layer portion before the heat treatment, the power consumption is reduced and the yield is good while suppressing initial investment. Product can be manufactured.
以下図を参酌して本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to the drawings.
なお、本発明における機械加工は、メッキ原板の表層部を除去することができれば加工方法は問わないが、以下の説明においては、ブラシによりメッキ原板表層部を研削する方法を例示して説明する。 In addition, the machining method in the present invention is not limited as long as the surface layer portion of the plating original plate can be removed, but in the following description, a method of grinding the surface layer portion of the plating original plate with a brush will be described as an example.
図１に従来技術による鋼帯の合金化溶融亜鉛メッキ装置の設備列例を示す。図右側のアンコイラー１に材料コイルをセットし、溶接機２にて先行材の尾端と当該コイル先端を溶接する。その後鋼帯は洗浄装置および研削装置３を通過したのち、入側ルーパー４を経て焼鈍炉以降のプロセスを通過する。出側ルーパー１１を経てシャー１２にて所定の長さにカットされた鋼帯５はコイラー１３に巻き取られ製品となる。
FIG. 1 shows an example of an equipment row of a conventional steel strip alloying hot dip galvanizing apparatus. A material coil is set in the uncoiler 1 on the right side of the drawing, and the tail end of the preceding material and the coil tip are welded by the welding machine 2. Thereafter, the steel strip passes through the cleaning device and the grinding device 3, and then passes through the process after the annealing furnace through the entrance looper 4. The steel strip 5 cut to a predetermined length by the
このような連続式の合金化溶融亜鉛メッキ装置において、入側ルーパー４から出側ルーパー１１までの間は一定の速度で通板する。しかし入側ルーパー４手前のアンコイラー１から洗浄装置および研削装置３までは先行材と後行材の溶接時には停止するので研削装置部分の鋼帯を過剰に研削してしまい、鋼帯にストップマークが出来てしまう。この部分前後は製品としては不適となってしまう。 In such a continuous alloying hot dip galvanizing apparatus, the passage from the entrance side looper 4 to the exit side looper 11 passes at a constant speed. However, since the uncoiler 1 in front of the entrance looper 4 to the cleaning device and the grinding device 3 are stopped when welding the preceding material and the following material, the steel strip of the grinding device is excessively ground, and a stop mark is present on the steel strip. I can do it. Before and after this part, it becomes unsuitable as a product.
溶接中は焼鈍炉６以降の設備を一定速で通板するために、入側ルーパー４に蓄積しておいた鋼帯を送り出す。溶接終了後には次の溶接タイミングまでに入側ルーパー４に再度鋼帯を蓄積するために、アンコイラー１から洗浄装置および研削装置３は通板速度を焼鈍炉以降の通板速度より増して入側ルーパーを追い込む必要がある。通板速度が増すと研削量が落ちるが、そのため研削装置３は追い込み時の通板速度でも所望の研削量を達成できるような仕様にしなくてはならない。入側ルーパー４内の鋼帯蓄積が十分になった後は次回の溶接まで研削装置３での通板速度は焼鈍炉６以降の速度と同じになるため、このとき研削装置３の仕様としては無駄に大きいものをもつことになる。 During welding, the steel strip accumulated in the entry-side looper 4 is sent out in order to pass the equipment after the annealing furnace 6 at a constant speed. After the end of welding, in order to accumulate the steel strip again in the entrance side looper 4 by the next welding timing, the cleaning device and the grinding device 3 from the uncoiler 1 increase the plate passing speed from the plate passing speed after the annealing furnace to the entrance side. You need to drive the looper. The grinding amount decreases as the plate passing speed increases. For this reason, the grinding device 3 must have specifications that can achieve the desired grinding amount even at the passing plate speed at the time of driving. After the steel strip accumulation in the entry side looper 4 is sufficient, the plate passing speed in the grinding apparatus 3 is the same as the speed after the annealing furnace 6 until the next welding. You have a big thing in vain.
図２に本発明による鋼帯の合金化溶融亜鉛メッキ装置の設備列例を示す。この場合研削装置１５は入側ルーパー後４の焼鈍炉６前に設置されているため、溶接時および入側ルーパー追い込み時に関わらず、一定の速度で通板がおこなわれる。このため溶接時にもストップマークは発生せず、追い込み速度に対応した設備仕様とする必要がないため、初期投資も従来技術に比べて小さくできる。 FIG. 2 shows an example of the equipment line of the steel strip alloying hot dip galvanizing apparatus according to the present invention. In this case, since the grinding device 15 is installed in front of the annealing furnace 6 after the entry side looper 4, the plate is passed at a constant speed regardless of the time of welding and the entry side looper driving. For this reason, no stop mark is generated even during welding, and it is not necessary to use equipment specifications corresponding to the driving speed, so that the initial investment can be reduced as compared with the prior art.
また研削装置１５を入側ルーパー後４の焼鈍炉６前に設置するときに、別に洗浄装置１４を入側ルーパー４の上流側に設置するほうが品質上有利である。洗浄装置は材料鋼板上の残留鉄粉や油分を除去するが、これらが除去されない鋼帯を入側ルーパー４に通板すると、入側ルーパー４内の搬送ローラー上に付着し鋼帯の押し疵となるからである。 In addition, when the grinding device 15 is installed in front of the annealing furnace 6 4 after the entrance looper, it is more advantageous in terms of quality to separately install the cleaning device 14 on the upstream side of the entrance looper 4. The cleaning device removes residual iron powder and oil on the steel plate, but if a steel strip that does not remove these is passed through the entrance looper 4, it adheres to the transport rollers in the entrance looper 4 and pushes the steel strip. Because it becomes.
従来は実際上洗浄装置と研削装置が兼用一体である。洗浄装置を入側ルーパー前に設置する場合に、これらから洗浄機能を分離して入側ルーパー４の上流側に設置して、研削装置のみ入側ルーパー後４の焼鈍炉６前に設置してもよいが、図３に示すごとく洗浄および研削装置を入側ルーパー後４の焼鈍炉６前に設置し、洗浄装置のみ側ルーパー４の上流側に設置してもよい。この場合設備投資は図２の構成に比べて若干増加するが、洗浄装置をルーパー入側と出側で２回通過するため、鋼帯の洗浄度が向上しより品質のよい製品を得ることが出来る。 Conventionally, the cleaning device and the grinding device are practically combined. When the cleaning device is installed before the entrance looper, the cleaning function is separated from these and installed upstream of the entrance looper 4, and only the grinding device is installed before the annealing furnace 6 after the entrance looper 4. However, as shown in FIG. 3, the cleaning and grinding apparatus may be installed in front of the annealing furnace 6 after the entrance side looper 4 and only the cleaning apparatus may be installed upstream of the side looper 4. In this case, the capital investment is slightly increased as compared with the configuration of FIG. 2, but since the cleaning device passes twice on the entrance side and the exit side of the looper, the degree of cleaning of the steel strip is improved and a product with better quality can be obtained. I can do it.
このような方法によって鋼板表面付近に濃化したＰ偏析を除去することにより、不良を防止することができる。この偏析層の深さは表面から１．０μｍ程度に分布している。これだけ全て研削により除去するのが好ましいが、これを実現するには膨大な装置となってしまう。実際的には０．１３μｍ〜０．５μｍ程度研削すれば、十分な歩留まり向上効果が得られる。これは１ｇ／ｍ２〜４ｇ／ｍ２の研削量に相当する。一方０．１μｍ以下では研削量過小で十分な歩留まり向上効果が得られない。 By removing P segregation concentrated in the vicinity of the steel sheet surface by such a method, defects can be prevented. The depth of the segregation layer is distributed about 1.0 μm from the surface. It is preferable to remove all of this by grinding, but to realize this, it becomes a huge apparatus. In practice, a sufficient yield improvement effect can be obtained by grinding about 0.13 μm to 0.5 μm. This corresponds to a grinding amount of 1 g / m 2 to 4 g / m 2. On the other hand, if it is 0.1 μm or less, a sufficient yield improvement effect cannot be obtained if the grinding amount is too small.
鋼中Ｓｉと鋼中Ｐ濃度が０．０３質量％以下のメッキ原板を使用する場合、表層部への偏析が軽微となる。また鋼中Ｓｉが２％かつ鋼中Ｐ濃度が０．１％を越えるようであると、偏析が鋼中にも起きてしまい、表面研削で除去できない筋模様となってしまう。本発明の主旨である鋼中表面に偏析したＳｉ・Ｐを除去する技術を適用するには鋼中Ｓｉ濃度０．０３〜２．０質量％もしくは鋼中Ｐ濃度０．０３〜０．１質量％のメッキ原板を用いる必要がある。 In the case where a plating original plate having a Si concentration in steel and a P concentration in steel of 0.03% by mass or less is used, segregation to the surface layer portion becomes minor. If the Si content in steel is 2% and the P concentration in steel is more than 0.1%, segregation also occurs in the steel, resulting in a streak pattern that cannot be removed by surface grinding. In order to apply the technology for removing Si · P segregated on the steel surface, which is the gist of the present invention, the Si concentration in the steel is 0.03 to 2.0% by mass or the P concentration in the steel is 0.03 to 0.1% by mass. % Of the plating plate must be used.
以下本発明を、発明例及び比較例に基づいて詳細に述べる。 Hereinafter, the present invention will be described in detail based on invention examples and comparative examples.
合金化溶融亜鉛メッキ鋼帯の製造ラインにおいて、熱処理前に原板表面片面あたり３ｇ／ｍ２を研削するための装置を設置する。本装置の通板速度は焼鈍炉部分で１５０ｍｐｍ、入側ルーパー手前は追い込み速度を考慮し最高２５０ｍｐｍである。材料となる鋼帯成分中のＳｉ濃度は０．４５％、Ｐ濃度は０．０１５％であった。
比較例として従来技術を採用し、図１のように入側ルーパー上流側に研削装置を設置した場合、研削ブラシスタンドは３台必要であった。溶接毎にブラシスタンド部分にストップマークが発生し、歩留まり落ちが発生した。（比較例１）
次に本発明を適用し、入側ルーパーと焼鈍炉との間に研削装置を設けた場合、研削ブラシスタンドは２台で所要の能力を発揮したため、従来技術に比して多額の初期投資を削減できた。また溶接時においても一定速で研削を続けることができ、比較例に比して製品歩留まりが０．９％向上した。（本発明例１）
次に本発明に基づき図２のように、洗浄装置を入側ルーパー上流側に設置した場合、入側ルーパー内搬送ローラーでの押し疵が消滅し、比較例に比して製品歩留まりが１．０％向上した。（本発明例２）
次に本発明に基づき図３のように、洗浄装置と研削装置を入側ルーパーと焼鈍炉との間に設け洗浄装置を入側ルーパー上流側に設置した場合、メッキ前鋼帯表面洗浄度が向上し比較例に比して製品歩留まりが１．１％向上した（本発明例３）。
In the production line of the alloyed hot-dip galvanized steel strip, an apparatus for grinding 3 g / m 2 per one surface of the original plate is installed before the heat treatment. The plate passing speed of this device is 150 mpm at the annealing furnace part, and the maximum before the entry side looper is 250 mpm in consideration of the driving speed. The Si concentration in the material steel strip component was 0.45%, and the P concentration was 0.015%.
When the conventional technique is adopted as a comparative example and the grinding apparatus is installed on the upstream side of the entrance looper as shown in FIG. 1, three grinding brush stands are necessary. Every time welding, a stop mark was generated in the brush stand, resulting in a drop in yield. (Comparative Example 1)
Next, when the present invention is applied and a grinding apparatus is provided between the entry side looper and the annealing furnace, two grinding brush stands exhibit the required capacity. Reduced. In addition, grinding could be continued at a constant speed during welding, and the product yield was improved by 0.9% compared to the comparative example. (Invention Example 1)
Next, as shown in FIG. 2, when the cleaning device is installed upstream of the entry side looper according to the present invention, the pushing rods at the entry side looper conveyance roller disappear, and the product yield is 1. Improved by 0%. (Invention Example 2)
Next, according to the present invention, as shown in FIG. 3, when the cleaning device and the grinding device are provided between the entrance side looper and the annealing furnace and the cleaning device is installed upstream of the entrance side looper, The product yield was improved by 1.1% as compared with the comparative example (Example 3 of the present invention).
次に装置は上記本発明例２の構成で、研削量を０．８ｇ／ｍ２とした。このとき製品に筋模様が発生しこれにより製品歩留まりが比較例１に比し１％悪化した（比較例２）。 Next, the apparatus had the configuration of the present invention example 2, and the grinding amount was 0.8 g / m 2. At this time, a streak pattern was generated in the product, which caused the product yield to deteriorate by 1% compared to Comparative Example 1 (Comparative Example 2).
次に研削量を５ｇ／ｍ２とした。このとき研削装置を入側ルーパーと焼鈍炉との間に設置したにも関わらず、研削ブラシが４スタンド必要であり、設備費が大きくなった。その割りに製品歩留まりは比較例１に比して１．２％向上したに過ぎず、歩留まり向上効果は小さかった。（比較例３）これらの結果をまとめて表１に示す。 Next, the grinding amount was set to 5 g / m2. At this time, although the grinding device was installed between the entrance side looper and the annealing furnace, four grinding brushes were necessary, and the equipment cost was increased. On the other hand, the product yield was only improved by 1.2% compared to Comparative Example 1, and the yield improvement effect was small. Comparative Example 3 These results are summarized in Table 1.
次に装置は上記本発明例２の構成で、鋼材中のＳｉ：０．０２％、Ｐ：０．０１％の鋼帯を使用し、研削量を０．８ｇ／ｍ２、３ｇ／ｍ２、５ｇ／ｍ２として比較したが、どのケースでも筋模様は発生しなかった。次に鋼材中のＳｉ：１．２％、Ｐ：０．１２％の鋼帯を使用し、研削量を０．８ｇ／ｍ２、３ｇ／ｍ２、５ｇ／ｍ２として比較したが、どのケースでも筋模様は消滅しなかった。よって本発明を適用する鋼帯は鋼中Ｓｉ濃度０．０３〜２．０質量％もしくは鋼中Ｐ濃度０．０３〜０．１質量％のどちらかの条件を満たすメッキ原板を用いる必要がある。 Next, the apparatus has the configuration of the present invention example 2 and uses a steel strip of Si: 0.02% and P: 0.01% in the steel material, and the grinding amount is 0.8 g / m2, 3 g / m2, 5 g. / M2 was compared, but no streak pattern was generated in any case. Next, using steel strips of Si: 1.2% and P: 0.12% in steel materials, the grinding amount was 0.8g / m2, 3g / m2, and 5g / m2. The pattern did not disappear. Therefore, the steel strip to which the present invention is applied needs to use a plating plate that satisfies either the Si concentration in the steel of 0.03 to 2.0 mass% or the P concentration in the steel of 0.03 to 0.1 mass%. .
これらより本発明の優位性が確認できた。 From these, the superiority of the present invention was confirmed.
１ アンコイラー
２ 溶接機
３ 洗浄装置および研削装置
４ 入側ルーパー
５ 鋼帯
６ 焼鈍炉
７ 溶融亜鉛浴
８ 合金化炉
９ 冷却帯
１０ 調質圧延機
１１ 出側ルーパー
１２ シャー
１３ コイラー
１４ 洗浄装置
１５ 研削装置
DESCRIPTION OF SYMBOLS 1 Uncoiler 2 Welding machine 3 Cleaning apparatus and grinding apparatus 4 Incoming looper 5 Steel strip 6 Annealing furnace 7 Molten zinc bath 8 Alloying furnace 9 Cooling zone 10 Temper rolling mill 11
Claims (5)
5. The plating base plate according to claim 1, wherein the Si concentration in the steel is 0.03 to 2.0 mass%, or the P concentration in the steel is 0.03 to 0.1 mass%. A method for producing an alloyed hot-dip galvanized steel strip according to claim 1.
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Cited By (3)
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| WO2014006749A1 (en) | 2012-07-06 | 2014-01-09 | 中外炉工業株式会社 | Continuous heating device |
| JP2015525685A (en) * | 2013-04-28 | 2015-09-07 | 宝山鋼鉄股▲分▼有限公司 | Method and system for combined shearing of steel plates |
| WO2022016614A1 (en) * | 2020-07-24 | 2022-01-27 | 惠博新型材料有限公司 | High-efficiency heat absorption device for hot galvanizing pot |
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| JP2015525685A (en) * | 2013-04-28 | 2015-09-07 | 宝山鋼鉄股▲分▼有限公司 | Method and system for combined shearing of steel plates |
| WO2022016614A1 (en) * | 2020-07-24 | 2022-01-27 | 惠博新型材料有限公司 | High-efficiency heat absorption device for hot galvanizing pot |
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