JP5510118B2 - Method for producing high-tensile steel plate excellent in chemical conversion treatment and production apparatus therefor - Google Patents
Method for producing high-tensile steel plate excellent in chemical conversion treatment and production apparatus therefor Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- Materials Engineering (AREA)
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- Grinding Of Cylindrical And Plane Surfaces (AREA)
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Description
本発明は、化成処理性に優れた高Si含有高張力鋼板の製造に際して、焼鈍後にSi含有酸化物層を効率よく除去して、化成処理性に優れた高張力鋼板を得るための製造方法および装置に関するものである。 The present invention provides a method for producing a high-strength steel sheet excellent in chemical conversion treatment by efficiently removing the Si-containing oxide layer after annealing in the production of a high-Si high-strength steel sheet excellent in chemical conversion treatment, and It relates to the device.
近年、地球環境の保全という観点から自動車の燃費改善が求められている。また、衝突時における乗員保護の観点から自動車の安全性向上も要求されている。このため、自動車の車体には軽量化と高強度化が必要とされ、最近では、自動車部品の薄肉化と高強度化が積極的に行われている。 In recent years, improvement in fuel efficiency of automobiles has been demanded from the viewpoint of conservation of the global environment. There is also a demand for improving the safety of automobiles from the viewpoint of occupant protection in the event of a collision. For this reason, it is necessary to reduce the weight and strength of automobile bodies, and recently, automobile parts have been actively reduced in thickness and strength.
一方、自動車部品の多くは鋼板をプレス成形して製造されることから、鋼板には高いプレス成形性、特に高い強度と高い延性、すなわち優れた強度-延性バランスが強く求められる。高い延性を有する高強度冷延鋼板には、強化元素としてSiが多量に含有される場合が多く、焼鈍時にSiの酸化物が鋼板表面に形成される。 On the other hand, since many automobile parts are manufactured by press-forming steel sheets, the steel sheets are strongly required to have high press formability, particularly high strength and high ductility, that is, excellent strength-ductility balance. A high strength cold-rolled steel sheet having high ductility often contains a large amount of Si as a strengthening element, and an Si oxide is formed on the steel sheet surface during annealing.
そのため、こうしたSi含有量の多い高強度冷延鋼板は、次工程にて化成処理を行ったとしても、均一かつ微細に化成結晶を形成させることができず、部分的に欠損した表面状態となる。この様な化成処理不良の鋼板表面では電着塗装等の塗装を施したとしても、密着性の良好な塗膜が得られないばかりでなく、塗装後の耐食性が劣化することとなる。 Therefore, such a high-strength cold-rolled steel sheet with a high Si content cannot be formed uniformly and finely even if chemical conversion treatment is performed in the next step, resulting in a partially deficient surface state. . Even if a coating such as electrodeposition coating is applied on the surface of such a steel sheet with poor chemical conversion treatment, a coating film with good adhesion cannot be obtained, and the corrosion resistance after coating is deteriorated.
これまで、この様な課題を解決すべく様々な技術が提案されており、例えば、特許文献1には、焼鈍炉出側に配置した液体噴射装置から、気体を加圧溶解した液体を吹付けることにより、鋼帯表面に生成した濃化物を除去する方法が開示されている。また、特許文献2〜5には、炉内雰囲気の酸素分圧を特定条件として焼鈍した後、特定速度で冷却を行い、表面を特定厚さの研削を行った後、酸洗して酸化膜を除去する方法が開示されている。 Various techniques have been proposed so far to solve such problems. For example, in Patent Document 1, a liquid in which a gas is dissolved under pressure is sprayed from a liquid injection device arranged on the exit side of an annealing furnace. Thus, a method for removing the concentrate formed on the surface of the steel strip is disclosed. Further, in Patent Documents 2 to 5, after annealing with the oxygen partial pressure in the furnace atmosphere as a specific condition, cooling is performed at a specific speed, the surface is ground to a specific thickness, and then pickled and oxidized. A method of removing is disclosed.
しかしながら、0.5質量%以上ものSiを含有する高張力鋼板に焼鈍を施すと、非常に強固で、かつ厚肉なSi含有酸化物層が鋼板表面に形成されるだけでなく、鋼板表面の粗度形態に対応して不均一に分布している。 However, when annealing a high-tensile steel sheet containing 0.5 mass% or more of Si, not only a very strong and thick Si-containing oxide layer is formed on the steel sheet surface, It is unevenly distributed corresponding to the roughness form.
そのため、連続焼鈍出側において表面研削を行う際は、強固でかつ厚肉なSi含有酸化物層を除去するために重研削が必要となる。研削後の鋼板表面は非常に活性が高い新生面となるので、研削時に供給されるクーラントと相まって、重研削後の鋼板表面は非常に錆びやすくなる。 Therefore, when surface grinding is performed on the continuous annealing side, heavy grinding is necessary to remove a strong and thick Si-containing oxide layer. Since the steel plate surface after grinding becomes a new surface with very high activity, the steel plate surface after heavy grinding becomes very susceptible to rusting together with the coolant supplied during grinding.
このような鋼板表面が錆びた状態で次工程の酸洗工程を通しても、表層の鉄酸化物によって酸洗効率が阻害され、均一に表層酸化物を除去することが困難であった。
また、Si添加に伴う固溶強化により変形抵抗が増大し、冷間圧延における圧延荷重が増加するので、鋼板の形状が乱れやすくなる。圧延時の鋼板の形状を制御するための代表的な方法としては、ロールベンディングやロールシフトなどがあるが、これらの形状制御アクチュエータによる形状制御能力には限界があるため、比較的表面の急峻度の高い状態の鋼板が連続焼鈍ラインに搬送される。
Even when the steel plate surface is rusted, the pickling efficiency of the surface layer is hindered by the iron oxide of the surface layer, and it is difficult to uniformly remove the surface layer oxide.
Moreover, since the deformation resistance increases due to the solid solution strengthening accompanying the addition of Si and the rolling load in cold rolling increases, the shape of the steel sheet tends to be disturbed. Typical methods for controlling the shape of a steel sheet during rolling include roll bending and roll shift. However, the shape control ability of these shape control actuators is limited, so the surface sharpness is relatively high. Steel sheets in a high state are conveyed to a continuous annealing line.
こういった形状不良が残存した鋼板を連続焼鈍した場合、連続焼鈍後にも同様の形状不良が残存している。このため、特許文献1〜5に記載の従来の方法では均一に表層酸化物を除去することが困難であった。 When a steel sheet in which such shape defects remain is subjected to continuous annealing, similar shape defects remain even after continuous annealing. For this reason, it was difficult for the conventional methods described in Patent Documents 1 to 5 to uniformly remove the surface layer oxide.
そこで、本発明では、焼鈍時に鋼板表面に形成されたSi含有酸化物層を効率よく除去して、化成処理性に優れた高張力鋼板の製造方法、その製造する方法を実施するために使用する製造装置を提供することを目的とする。 Therefore, in the present invention, the Si-containing oxide layer formed on the surface of the steel sheet during annealing is efficiently removed, and the method for producing a high-tensile steel sheet excellent in chemical conversion treatment and the method for producing the same are used. An object is to provide a manufacturing apparatus.
発明者は、焼鈍時に鋼板表面に形成されたSi含有酸化物層を効率よく除去して、化成処理性に優れた高張力鋼板を製造する方法について検討を重ね、以下の知見を得た。 The inventor repeatedly studied a method for producing a high-tensile steel sheet having excellent chemical conversion properties by efficiently removing the Si-containing oxide layer formed on the steel sheet surface during annealing, and obtained the following knowledge.
重研削後に露出する鋼板新生面上にクーラントが付着していると錆の発生が進行していくが、研削後の経過時間と酸洗での除去効率の関係について種々検討した結果、研削後酸洗設備までの時間が所定以内の経過時間であれば酸洗での除去効率に影響しないことを見出した。すなわち、研削後表面に生じる錆を防止するため、研削クーラントを除去する乾燥工程を設けると共に、表面研削後の鋼板が酸洗処理に到達するまでの時間を60秒以内とする。 Rust generation occurs when coolant adheres to the new steel surface exposed after heavy grinding, but as a result of various studies on the relationship between elapsed time after grinding and removal efficiency by pickling, It has been found that if the time to equipment is within a predetermined time, the removal efficiency in pickling is not affected. That is, in order to prevent rust generated on the surface after grinding, a drying step for removing the grinding coolant is provided, and the time until the steel plate after surface grinding reaches the pickling treatment is set within 60 seconds.
また、高Si含有鋼のように冷間圧延後に形状不良が大きい(表面の急峻度が大きい)鋼板に対して、連続焼鈍時に形成されるSi含有酸化物層を効率的に除去する方法について検討した結果、連続焼鈍の前工程(例えば、冷間タンデム圧延の最終圧延スタンド出側)において、鋼板形状計を設置して焼鈍前の鋼板表面の形状(急峻度)を測定し、形状計にて測定された鋼板表面の急峻度に応じて、焼鈍後の鋼板表面を研削する条件を調整することにより、Si含有酸化物層を効率的に除去することができることがわかった。具体的な研削条件としては、例えば、研削体(回転研削体)の回転数、圧下量及び供給されるクーラント流量を調整することで研削量を調整する。 Also, a method for efficiently removing the Si-containing oxide layer formed during continuous annealing on steel sheets with large shape defects (high surface steepness) after cold rolling, such as high-Si steels. As a result, in the pre-process of continuous annealing (for example, the final rolling stand exit side of cold tandem rolling), a steel plate shape meter is installed to measure the shape (steepness) of the surface of the steel plate before annealing. It was found that the Si-containing oxide layer can be efficiently removed by adjusting the conditions for grinding the steel plate surface after annealing according to the measured steepness of the steel plate surface. As specific grinding conditions, for example, the grinding amount is adjusted by adjusting the number of rotations of the grinding body (rotary grinding body), the amount of rolling reduction, and the supplied coolant flow rate.
形状計での鋼板表面の形状測定は鋼板長手方向の全長に亘っているため、冷間圧延における加速・減速時の非定常部においても適切な表面研削条件を付与することが出来るのでコイル全長にわたって均一に表層酸化物を除去することができる。 Since the shape measurement of the steel sheet surface with the shape meter covers the entire length in the longitudinal direction of the steel sheet, appropriate surface grinding conditions can be applied even in the unsteady part during acceleration / deceleration in cold rolling, The surface oxide can be uniformly removed.
本発明では、機械的研削のあとに化学的研削を組合せて行なう。つまり、機械的研削の後に、化学的研削として酸洗を行うことで、研削により剥離強度が低下した残存酸化物層を効率よく除去でき、部分的に酸化物層が残存しない全面にわたって均一な研削表面が得られる。 In the present invention, mechanical grinding is combined with chemical grinding. In other words, by performing pickling as chemical grinding after mechanical grinding, the remaining oxide layer whose peel strength has decreased due to grinding can be efficiently removed, and uniform grinding over the entire surface where no oxide layer remains partially A surface is obtained.
本発明は、上記した知見に基づきなされたもので以下のような特徴を有する。 The present invention has been made based on the above findings and has the following characteristics.
第一の発明は、質量%で、Siを0.5%以上含有する高張力鋼板を連続焼鈍後に、表面研削処理と酸洗処理を行うにあたり、前記表面研削処理時には、連続焼鈍前の高張力鋼板の急峻度に応じて、研削体の回転数、圧下量及び研削体に供給されるクーラント流量のいずれか1つまたは2つ以上を調整し、さらに前記表面研削処理後の鋼板が酸洗設備に到達するまでの時間を60秒以内とすることを特徴とする化成処理性に優れた高張力鋼板の製造方法である。 In the first invention, in performing surface grinding treatment and pickling treatment after continuous annealing of a high-tensile steel sheet containing 0.5% or more of Si by mass%, during the surface grinding treatment, high tension before continuous annealing is used. According to the steepness of the steel sheet, one or more of the number of revolutions of the grinding body, the reduction amount and the coolant flow rate supplied to the grinding body are adjusted, and the steel sheet after the surface grinding treatment is pickled. It is the manufacturing method of the high-tensile steel plate excellent in chemical conversion property characterized by making time to reach | attain within 60 second.
第二の発明は、前記表面研削処理は、少なくとも上下一対の回転研削体にて行うことを特徴とする第一の発明に記載の化成処理性に優れた高張力鋼板の製造方法である。 The second invention is the method for producing a high-tensile steel sheet excellent in chemical conversion treatment property according to the first invention, wherein the surface grinding treatment is performed by at least a pair of upper and lower rotary grinding bodies.
第三の発明は、研削及び酸洗による鋼板質量の減少量をFe換算で4.0g/m2以上とすることを特徴とする第一または第二の発明に記載の化成処理性に優れた高張力鋼板の製造方法である。 The third invention is excellent in chemical conversion treatment as described in the first or second invention, characterized in that the reduction amount of the steel sheet mass by grinding and pickling is 4.0 g / m 2 or more in terms of Fe. It is a manufacturing method of a high-tensile steel plate.
第四の発明は、第一乃至第三の発明のいずれかに記載の製造方法に用いる鋼板の製造装置であって、連続焼鈍設備を有し、連続焼鈍設備の上流側に鋼板表面の急峻度を測定する形状測定手段を有し、前記連続焼鈍設備の下流側には、前記形状測定手段により測定した急峻度に基づいて鋼板表面を研削する際に、研削体の回転数、圧下量及び供給されるクーラント流量のいずれか1つまたは2つ以上を調整できる表面研削手段、さらにその下流側に酸洗設備を設けていることを特徴とする鋼板の製造装置である。 A fourth invention is a steel sheet manufacturing apparatus used in the manufacturing method according to any one of the first to third inventions, has a continuous annealing facility, and the steepness of the steel sheet surface upstream of the continuous annealing facility. A shape measuring means for measuring the rotational speed of the grinding body, the amount of reduction and the supply when the steel sheet surface is ground on the downstream side of the continuous annealing equipment based on the steepness measured by the shape measuring means. A surface grinding means capable of adjusting any one or two or more of the coolant flow rate, and further a pickling facility provided downstream thereof.
本発明によれば、高Si含有鋼板であっても焼鈍で生ずる表層酸化物を完全に除去し、鋼板表面の全面に亘って良好な化成被膜を形成させることができるため、高張力鋼板において強度と加工性だけでなく塗装後耐食性の向上も図れる。 According to the present invention, even in a high-Si steel sheet, the surface layer oxide generated by annealing can be completely removed, and a good chemical conversion film can be formed over the entire surface of the steel sheet. In addition to workability, it can improve corrosion resistance after painting.
以下、本発明を実施するための最良の形態の一例を説明する。 Hereinafter, an example of the best mode for carrying out the present invention will be described.
本発明の高張力鋼板の製造方法においては、Siを0.5質量%以上含有する鋼板を用いる。鋼板組成については、Si量が0.5質量%未満では焼鈍時に鋼板表層に濃化するSi量が僅かであり、特別な前処理を施さなくても充分な化成処理性が確保されるので、Si量を0.5質量%以上とする。Si量の上限は特に規定しないが、鋼中Si量が3質量%を超えると鋼板の加工性が劣化する傾向があるため、Si量は3質量%以下が望ましい。他の成分については、C、Mn、P、S、Sol.Al、Cr、Mo、Ti、Nb等が適量添加された鋼板においても本発明の趣旨が損なわれることはない。 In the method for producing a high-tensile steel plate of the present invention, a steel plate containing 0.5% by mass or more of Si is used. For the steel sheet composition, if the Si amount is less than 0.5% by mass, the amount of Si concentrated on the steel sheet surface layer during annealing is small, and sufficient chemical conversion treatment properties are ensured without special pretreatment. The amount of Si is 0.5% by mass or more. The upper limit of the amount of Si is not particularly specified, but if the amount of Si in the steel exceeds 3% by mass, the workability of the steel sheet tends to deteriorate, so the amount of Si is preferably 3% by mass or less. For other components, C, Mn, P, S, Sol. Even in a steel sheet to which an appropriate amount of Al, Cr, Mo, Ti, Nb or the like is added, the gist of the present invention is not impaired.
図1は、本発明に係る高張力鋼板の製造方法が適用される鋼板の製造装置の一例を示す概略構成図である。図1に示す鋼板の製造装置は、タンデム圧延機2にて冷間圧延された鋼板1を連続焼鈍するものであり、連続焼鈍設備4の出側に回転研削体5及び水切り装置7及び酸洗設備8が配置されている。そして、調質圧延機9を通ってコイラー10で巻き取られる構成となっている。 FIG. 1 is a schematic configuration diagram illustrating an example of a steel plate manufacturing apparatus to which a high-strength steel plate manufacturing method according to the present invention is applied. The steel plate manufacturing apparatus shown in FIG. 1 continuously anneals a steel plate 1 that has been cold-rolled by a tandem rolling mill 2, and a rotating grinding body 5, a draining device 7, and pickling are provided on the exit side of the continuous annealing equipment 4. Facility 8 is arranged. And it is the structure wound up with the coiler 10 through the temper rolling mill 9. FIG.
図1においてタンデム圧延機2は4段式のスタンドとして表記されているが、本発明は4段式の場合に限定するものではなく、6段式或いはクラスタ型の圧延スタンドでもよい。また、タンデム圧延機2の圧延スタンド数も図1では5スタンドとして図示されているがこれに限定されない。 In FIG. 1, the tandem rolling mill 2 is represented as a four-stage stand, but the present invention is not limited to the four-stage type, and may be a six-stage or cluster type rolling stand. Moreover, although the number of rolling stands of the tandem rolling mill 2 is shown as five stands in FIG. 1, it is not limited to this.
本発明に係る高張力鋼板の製造方法が適用される表面研削設備は連続焼鈍設備と連続した設備である必要は無い。例えば、連続焼鈍した鋼帯を独立した表面研削ラインに適用することも可能である。 The surface grinding equipment to which the method for producing a high-strength steel sheet according to the present invention is applied does not need to be a continuous equipment with a continuous annealing equipment. For example, a continuously annealed steel strip can be applied to an independent surface grinding line.
連続焼鈍時に生成する表層酸化膜に対し、表層酸化膜除去の第一段階として、回転研削体5による機械的研削を行う。研削手段は特に限定せず、研磨布紙、ワイヤブラシ、砥粒入ナイロンブラシ、弾性砥石ロール等の何れを用いてもよいが、JIS−R6001規格の砥粒番号は♯60〜♯400、より好ましくは♯80〜♯240であることが望ましい。また、研削体の回転数は600〜1500rpmが好ましい。 As a first step of removing the surface oxide film, mechanical grinding by the rotary grinding body 5 is performed on the surface oxide film generated during the continuous annealing. The grinding means is not particularly limited, and any of a polishing cloth, a wire brush, a nylon brush with abrasive grains, an elastic grindstone roll or the like may be used. The abrasive grain number of JIS-R6001 standard is # 60 to # 400. # 80 to # 240 is preferable. Further, the rotational speed of the grinding body is preferably 600 to 1500 rpm.
上記機械的研削では、前工程であるタンデム圧延機2の出側に設けられた形状計3にて計測された鋼板急峻度に応じて、図示しないコントローラーからの指令11によって研削手段(例えば、回転研削体5)の回転数、圧下量及び供給クーラント流量のいずれか1つまたは2つ以上が調整される。研削手段(例えばブラシ等の回転研削体)の圧下量は1〜4mmが好ましい。ここで、圧下量とは回転研削体が鋼板表面と接触する位置を基準位置とし、この基準位置と実際の設置位置との間の、鋼板板厚方向への距離のことである。 In the mechanical grinding, grinding means (for example, rotation) according to a command 11 from a controller (not shown) according to the steepness of the steel plate measured by the shape meter 3 provided on the exit side of the tandem rolling mill 2 as the previous process. Any one or more of the number of rotations, the reduction amount and the supply coolant flow rate of the grinding body 5) are adjusted. The rolling amount of the grinding means (for example, a rotating grinding body such as a brush) is preferably 1 to 4 mm. Here, the amount of reduction is the distance in the steel plate thickness direction between the reference position and the actual installation position, with the position where the rotary grinding body contacts the steel plate surface as the reference position.
また、クーラント流量は、流量密度(単位面積・単位時間当たりのクーラント流量)で1000〜5000L/min/m2が好ましい。 The coolant flow rate is preferably 1000 to 5000 L / min / m 2 in terms of flow density (a coolant flow rate per unit area / unit time).
ここで、急峻度に応じた研削条件は、予め次のようにして求めておく。すなわち、形状計3にて計測された鋼板急峻度に対して所定の研削量を確保できる研削条件を、材料(材質や板厚、板幅の寸法)毎に整理した実験データや操業データなどから求めておく。 Here, the grinding conditions corresponding to the steepness are obtained in advance as follows. That is, from the experimental data and operation data arranged for each material (material, plate thickness, plate width dimensions), grinding conditions that can secure a predetermined grinding amount for the steel plate steepness measured by the shape meter 3 I ask for it.
図2〜図4は、Si量が0.5質量%以上の鋼板について、焼鈍出側にて表面研削及び酸洗を行った操業データより、急峻度とFe換算で4.0g/m2以上、15.0g/m2以下を得るために必要な研削条件との関係を整理した結果である。 FIGS. 2 to 4 show that the steel content is 0.5 mass% or more and the operation data obtained by surface grinding and pickling on the annealing side are 4.0 g / m 2 or more in terms of steepness and Fe. This is the result of arranging the relationship with the grinding conditions necessary to obtain 15.0 g / m 2 or less.
コントローラーでは例えば、図2〜図4に示すグラフに基づき、上記鋼板急峻度に応じた研削手段の研削条件を算出して、研削条件を調整する。なお、ここで、上記実施形態においては、鋼板急峻度に対して一次比例した量だけ研削条件を変化させているが、これに限定されない。例えば階段状や2次以上の曲線にて鋼板急峻度と研削条件とを対応付けておいてもよい。
ここで、鋼板急峻度(%)とは、鋼板長手方向の一定区間(一定の長さ)Lにおける鋼板波高さをδとした場合に、δ/L×100で表される。鋼板波高さは一定区間Lで切り出した鋼板を水平な定盤上に置いたときの鋼板の反り高さである。
In the controller, for example, based on the graphs shown in FIG. 2 to FIG. 4, the grinding condition of the grinding means corresponding to the steel plate steepness is calculated to adjust the grinding condition. Here, in the above-described embodiment, the grinding condition is changed by an amount that is linearly proportional to the steel sheet steepness, but the present invention is not limited to this. For example, the steepness of the steel sheet and the grinding conditions may be associated with each other in a stepped shape or a quadratic or higher curve.
Here, the steel sheet steepness (%) is represented by δ / L × 100, where δ is the steel plate wave height in a certain section (constant length) L in the longitudinal direction of the steel sheet. The steel plate wave height is the warp height of the steel plate when the steel plate cut out in a certain section L is placed on a horizontal surface plate.
鋼板急峻度の測定方法については特に限定しないが、ロードセルや圧電素子等により計測した板幅方向の荷重分布を板形状として算出する接触式形状計や電磁吸引式といった非接触式形状計を用いることにより測定することができる。 The method for measuring the steepness of the steel plate is not particularly limited, but a non-contact type shape meter such as a contact type shape meter or electromagnetic suction type that calculates the load distribution in the plate width direction measured by a load cell or piezoelectric element as the plate shape should be used. Can be measured.
クーラントヘッダー6から回転研削体5に供給されるクーラント流量を調整することで回転研削体5及び鋼板1との接触面積が調整されると共に、研削を促進させると考えられる脱落した砥粒や研削粉の滞留時間が変化し、研削量が調整できる。研削体の回転数や圧下量の調整も研削体及び鋼板との接触面積が変化する点で同様である。 By adjusting the coolant flow rate supplied from the coolant header 6 to the rotating grinding body 5, the contact area between the rotating grinding body 5 and the steel plate 1 is adjusted, and dropped abrasive grains and grinding powder that are thought to promote grinding The dwell time changes, and the grinding amount can be adjusted. Adjustment of the rotational speed and reduction amount of the grinding body is the same in that the contact area between the grinding body and the steel plate changes.
なお、上記機械的研削では、形状計3にて計測された鋼板急峻度に応じて研削手段が調整されると説明したが、連続焼鈍設備4内に形状計3が設置されている場合は、連続焼鈍設備4内での鋼板急峻度をコントローラーへの指令値に適用しても良い。 In the above mechanical grinding, it has been described that the grinding means is adjusted according to the steel sheet steepness measured by the shape meter 3, but when the shape meter 3 is installed in the continuous annealing equipment 4, The steepness of the steel plate in the continuous annealing equipment 4 may be applied to the command value to the controller.
このように、形状計3により鋼板急峻度を測定して研削条件を設定することが、研削工程の前段階にて行うことができれば良いので、研削工程の前(例えば、連続焼鈍設備4の出側で回転研削体5の前)に形状計3を設置してもよい。 In this way, it is only necessary to measure the steepness of the steel sheet by the shape meter 3 and set the grinding conditions in the previous stage of the grinding process. Therefore, before the grinding process (for example, the output of the continuous annealing equipment 4). The shape meter 3 may be installed on the side in front of the rotating grinding body 5).
機械的研削後は、水切り装置7にて鋼板表面に付着した研削クーラントを除去する。水切り手段は特に限定せず、リンガーロール、乾燥ドライヤー等の何れを用いても良い。 After mechanical grinding, the grinding coolant adhering to the steel plate surface is removed by the draining device 7. The draining means is not particularly limited, and any of a ringer roll, a drying dryer, etc. may be used.
本発明では、機械的研削に次いで酸洗設備8に通すことにより、機械的研削によりSi含有酸化物が除去されて露出した母材と残存するSi含有酸化物層との境界に酸が浸透し、残存するSi含有酸化物層が剥離除去される。前記酸洗設備8に用いる酸洗液は、濃度が5体積%以上の塩酸または硫酸が好ましく、また酸洗は5秒間以上、より好ましくは8秒間以上行うことが好ましい。 In the present invention, by passing through the pickling equipment 8 after mechanical grinding, the acid penetrates into the boundary between the base material exposed by removing the Si-containing oxide by mechanical grinding and the remaining Si-containing oxide layer. The remaining Si-containing oxide layer is peeled off. The pickling solution used for the pickling equipment 8 is preferably hydrochloric acid or sulfuric acid having a concentration of 5% by volume or more, and the pickling is preferably performed for 5 seconds or more, more preferably 8 seconds or more.
表面研削後の鋼板1が酸洗設備8に到達するまでの時間は60秒以内とする。
60秒を超えると、鋼板表面に発生した錆が成長し、その後の酸洗での除去効率が低下するからである。
The time until the steel plate 1 after surface grinding reaches the pickling equipment 8 is within 60 seconds.
This is because, if it exceeds 60 seconds, rust generated on the surface of the steel sheet grows and the removal efficiency in the subsequent pickling decreases.
回転研削体5による機械的研削及び酸洗設備8による化学的研削による鋼板質量の減少量の合計がFe換算で4.0g/m2未満では、Si含有酸化物層が全面に亘って均一に除去されず、化成結晶が欠損した表面状態となる可能性があるため、鋼板質量の減少量の合計はFe換算で4.0g/m2以上とするのが好ましい。鋼板質量の減少量の合計の上限は特に規定しないが、鋼板質量の減少量が15.0g/m2を超えると材料歩留が悪化する上、作業能率も悪くなる傾向があるため、鋼板質量の減少量の合計は15.0g/m2以下であることが望ましい。 When the total reduction in the mass of the steel sheet by mechanical grinding by the rotating grinding body 5 and chemical grinding by the pickling equipment 8 is less than 4.0 g / m 2 in terms of Fe, the Si-containing oxide layer is uniformly distributed over the entire surface. Since there is a possibility that a surface state in which the chemical conversion crystal is lost without being removed, the total reduction in the mass of the steel sheet is preferably 4.0 g / m 2 or more in terms of Fe. The upper limit of the total amount of reduction in the steel sheet mass is not particularly specified, but if the reduction in the steel sheet mass exceeds 15.0 g / m 2 , the material yield tends to deteriorate and the work efficiency tends to deteriorate. The total reduction amount is preferably 15.0 g / m 2 or less.
ここで、鋼板質量の減少量は、次のようにして求めた。つまり、同一鋼種、同一製造条件のコイルを2つ準備し、前者のコイルでは研削・酸洗・調質圧延を行い、後者のコイルでは調質圧延のみを行い研削なしで酸洗なしのものを製造した。両方のコイル中、鋼板長手方向のT部(TOP)、M部(MIDDLE)、B部(BOTTOM)から、研削なしで酸洗なしの鋼板(後者コイル)、研削・酸洗した鋼板(前者コイル)を一定面積だけ切り出して鋼板質量を測定し、それを切り出した面積で除して両者の差を算出することにより、研削および酸洗による鋼板質量の減少量を求めた。 Here, the reduction | decrease amount of the steel plate mass was calculated | required as follows. In other words, two coils of the same steel type and the same production conditions are prepared, and the former coil is ground, pickled, and temper rolled, and the latter coil is tempered and rolled without grinding and without pickling. Manufactured. Among both coils, from steel part longitudinal T part (TOP), M part (MIDDLE), B part (BOTTOM), steel plate without grinding without pickling (latter coil), steel plate with grinding and pickling (former coil) ) Was cut out by a certain area, and the mass of the steel sheet was measured, and the difference between the two was calculated by dividing it by the area of the cut out, whereby the amount of reduction in the mass of the steel sheet by grinding and pickling was determined.
図1の本実施の形態では、二対の回転研削体5を示したが、本発明では、これに限定されるものではなく、要求される製品の外観品質や性能を得ることができるのであれば回転研削体5は1対のみ配置してもよいし、設備の設置スペースを確保できれば回転研削体5は3対以上設置するようにしてもよい。 In the present embodiment of FIG. 1, two pairs of rotary grinding bodies 5 are shown. However, the present invention is not limited to this, and the required appearance quality and performance of the product can be obtained. For example, only one pair of the rotating grinding bodies 5 may be arranged, or three or more pairs of the rotating grinding bodies 5 may be installed as long as an installation space for equipment can be secured.
以上示した鋼板の製造方法を用いることにより、高Si含有鋼板であっても焼鈍で生ずる表層酸化物を完全に除去し、鋼板表面の全面に亘って良好な化成被膜を形成させることが可能となる。また、化成処理性に優れた高張力鋼板の製造方法に用いる製造装置としては、連続焼鈍設備を有し、連続焼鈍設備の上流側に鋼板表面の急峻度を測定する形状測定手段を有し、前記連続焼鈍設備の下流側には、前記形状測定手段により測定した急峻度に基づいて鋼板表面を研削する条件を調整できる表面研削手段、さらにその下流側に酸洗設備を設けていることを特徴とする鋼板の製造装置であればよいので、図1の構成に限定されることはない。 By using the steel plate manufacturing method shown above, it is possible to completely remove the surface layer oxide generated by annealing even in the case of a high Si content steel plate, and to form a good conversion coating over the entire surface of the steel plate surface. Become. Moreover, as a manufacturing apparatus used for a method of manufacturing a high-strength steel sheet excellent in chemical conversion processability, it has a continuous annealing facility, and has a shape measuring means for measuring the steepness of the steel sheet surface on the upstream side of the continuous annealing facility, On the downstream side of the continuous annealing equipment, surface grinding means capable of adjusting conditions for grinding the steel sheet surface based on the steepness measured by the shape measuring means, and further provided with pickling equipment on the downstream side thereof. Therefore, the present invention is not limited to the configuration shown in FIG.
以下、本発明を実施例に基づいて説明する。 Hereinafter, the present invention will be described based on examples.
図1に示す鋼板の製造装置にて、板厚1.2mmで板幅950mmの鋼中Si濃度0.4〜1.5質量%の高張力鋼板を連続焼鈍した後、機械的研削と化学的研削を組み合わせて表層酸化物層の除去を行い、調質圧延を実施した。その際、用いた鋼板の組成、研削条件、及び得られた鋼板の化成処理評価結果を表1に示す。
なお、連続焼鈍時のラインスピードは90mpmであり、連続焼鈍前の鋼板急峻度は、タンデム圧延機出側に設置された接触式形状計により測定した結果、0.8〜1.6%であった。
In a steel plate manufacturing apparatus shown in FIG. 1, after continuous annealing of a high-tensile steel plate having a plate thickness of 1.2 mm and a plate width of 950 mm and having a Si concentration of 0.4 to 1.5 mass%, mechanical grinding and chemical The surface oxide layer was removed by combining grinding and temper rolling was performed. Table 1 shows the composition of the steel plate used, the grinding conditions, and the chemical conversion treatment evaluation results of the obtained steel plate.
The line speed at the time of continuous annealing was 90 mpm, and the steel sheet steepness before continuous annealing was 0.8 to 1.6% as a result of measurement by a contact type shape meter installed on the tandem rolling mill outlet side. It was.
ここで、機械的研削では、JIS−R6001規格の砥粒番号♯80の砥粒入ブラシを用い、回転方向はアップカット(鋼板搬送方向とは逆の回転)とした。乾燥工程はブラシ研削の後、リンガーロールにて行った。化学的研削となる酸洗条件は、酸として60℃、濃度10体積%の硫酸を使用し、酸洗時間はラインスピードから換算して10秒であった。 Here, in the mechanical grinding, an abrasive brush with abrasive grain number # 80 of JIS-R6001 standard was used, and the rotation direction was up-cut (rotation opposite to the steel plate conveyance direction). The drying process was performed with a ringer roll after brush grinding. The pickling conditions for chemical grinding were 60 ° C. and 10% by volume sulfuric acid as the acid, and the pickling time was 10 seconds in terms of line speed.
また、鋼板の化成処理性については、調質圧延後の鋼板についてコイル長手方向(T:先端部、M:中間部、B:尾端部)からサンプルを採取して以下の方法により評価した。 Moreover, about the chemical conversion property of a steel plate, the sample was extract | collected from the coil longitudinal direction (T: front-end | tip part, M: intermediate part, B: tail end part) about the steel plate after temper rolling, and the following method evaluated.
化成処理では表2に示す条件にて、脱脂、水洗、表面調整工程を経た後、市販の化成処理薬剤(日本パーカライジング株式会社製パルボンドPB−L3020)を用いて化成処理を行った。 In the chemical conversion treatment, the chemical conversion treatment was performed using a commercially available chemical conversion treatment agent (Palbond PB-L3020 manufactured by Nihon Parkerizing Co., Ltd.) under the conditions shown in Table 2 after degreasing, washing with water, and a surface adjustment step.
高張力鋼板の化成処理を行った後、その表面を走査型電子顕微鏡にて倍率500倍で5視野観察し、面積率95%以上の均一な化成結晶が5視野全てにおいて生成しているものを○とし、面積率5%超えの隙間が1視野認められた場合は△、2視野以上認められた場合は×として評価した。 After the chemical conversion treatment of the high-tensile steel plate, the surface is observed with a scanning electron microscope at 5 magnifications at 500 magnifications, and a uniform chemical crystal having an area ratio of 95% or more is generated in all 5 visual fields. It was evaluated as ◯, and when 1 field of view with an area ratio exceeding 5% was observed, Δ was evaluated when 2 fields or more were recognized.
本発明例では、前工程である冷間タンデムにおける圧延機出側にて計測された鋼板急峻度に応じて、コントローラーからの指令によって回転研削体の回転数、ブラシ圧下量及びクーラント流量が調整され、図2〜4に応じて制御された。 In the present invention example, the rotational speed, brush reduction amount and coolant flow rate of the rotating grinding body are adjusted by a command from the controller according to the steel sheet steepness measured at the rolling mill outlet side in the cold tandem which is the previous process. 2 to 4 were controlled.
例えば、No.2においてブラシ圧下量は、図3に基づき、回転研削体を通過する長手鋼板位置に対応する急峻度が0.8%の場合に2.9mmに設定し、急峻度が1.2%のときに3.1mmに変更するように調整した。
鋼板質量の減少量は、次のようにして求めた。つまり、同一鋼種、同一製造条件のコイルを2つ準備し、前者のコイルでは研削・酸洗・調質圧延を行い、後者のコイルでは調質圧延のみを行い研削なしで酸洗なしのものを製造した。両方のコイル中、鋼板長手方向のT部(TOP)、M部(MIDDLE)、B部(BOTTOM)から、研削なしで酸洗なしの鋼板(後者コイル)、研削・酸洗した鋼板(前者コイル)を一定面積だけ切り出して鋼板質量を測定し、それを切り出した面積で除して両者の差を算出することにより、研削および酸洗による鋼板質量の減少量を求めた。表1中の減少量は、T部、M部、B部における測定値の平均値を示している。
For example, no. 2, the brush reduction amount is set to 2.9 mm when the steepness corresponding to the position of the longitudinal steel plate passing through the rotating grinding body is 0.8% based on FIG. 3, and when the steepness is 1.2% It was adjusted to change to 3.1 mm.
The amount of reduction in the steel plate mass was determined as follows. In other words, two coils of the same steel type and the same production conditions are prepared, and the former coil is ground, pickled, and temper rolled, and the latter coil is tempered and rolled without grinding and without pickling. Manufactured. Among both coils, from steel part longitudinal T part (TOP), M part (MIDDLE), B part (BOTTOM), steel plate without grinding without pickling (latter coil), steel plate with grinding and pickling (former coil) ) Was cut out by a certain area, and the mass of the steel sheet was measured, and the difference between the two was calculated by dividing it by the area of the cut out, whereby the amount of reduction in the mass of the steel sheet by grinding and pickling was determined. The amount of decrease in Table 1 indicates the average value of the measured values in the T part, M part, and B part.
表1に示すように、No.2〜4は本発明例であり、No.1は参考例及びNo.5〜7は比較例である。 As shown in Table 1, no. 2 to 4 are examples of the present invention. No. 1 is a reference example and no. 5-7 are comparative examples.
No.1は鋼中Si量が低いため、研削条件によらず良好な化成処理性が得られている。No.5の鋼板質量の減少量は発明の範囲内であるが、鋼板急峻度が不安定であるコイル先尾端部の圧延非定常部では満足な研削が行われず、一部Si含有酸化物が観察された。このため、化成処理においても部分的に結晶が欠損し化成処理不良となった。No.6は、鋼板の急峻度に応じて機械的研削の条件を調整していないため、コイル長手方向の全体に亘って、化成不良となった。No.7は、機械的研削から酸洗までの到達時間が本発明を満足しておらず、酸洗効率の低下から化成不良となった。 No. Since No. 1 has a low amount of Si in steel, good chemical conversion processability is obtained regardless of grinding conditions. No. Although the amount of reduction in the steel plate mass of 5 is within the scope of the invention, satisfactory grinding is not performed at the rolling unsteady portion of the coil leading end where the steel plate steepness is unstable, and some Si-containing oxides are observed. It was done. For this reason, even in the chemical conversion treatment, crystals were partially lost, resulting in a chemical conversion treatment failure. No. In No. 6, since the mechanical grinding conditions were not adjusted according to the steepness of the steel plate, the formation failure occurred over the entire length of the coil. No. No. 7 did not satisfy the present invention from the mechanical grinding to the pickling, and the chemical conversion was poor due to the decrease in pickling efficiency.
これに対し、本発明例であるNo.2〜4のいずれも全面に亘って良好な化成被膜が得られ、かつ塗装密着性のよい強度・加工性に優れた高張力鋼板が得られることが判る。 On the other hand, No. which is an example of the present invention. It can be seen that in any of 2 to 4, a good chemical conversion film can be obtained over the entire surface, and a high-tensile steel plate excellent in coating adhesion and excellent in strength and workability can be obtained.
1 鋼板
2 タンデム圧延機
3 形状計
4 連続焼鈍設備(連続焼鈍炉)
5 回転研削体
6 ク−ラントヘッダ
7 水切り装置
8 酸洗設備(酸洗装置)
9 調質圧延機
10 コイラー
11 鋼板形状情報
DESCRIPTION OF SYMBOLS 1 Steel plate 2 Tandem rolling mill 3 Shape meter 4 Continuous annealing equipment (continuous annealing furnace)
5 Rotating grinding body 6 Coolant header 7 Draining device 8 Pickling equipment (pickling device)
9 Temper rolling mill 10 Coiler 11 Steel plate shape information
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