JP2006045615A - Method for producing cold rolled steel sheet - Google Patents
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本発明は、冷延鋼板の製造方法、特に、表面性状及び化成処理性に優れる高張力冷延鋼板の製造に好適な冷延鋼板の製造方法に関する。 The present invention relates to a method for producing a cold-rolled steel sheet, and more particularly, to a method for producing a cold-rolled steel sheet suitable for producing a high-tensile cold-rolled steel sheet having excellent surface properties and chemical conversion properties.
従来、高張力鋼板は、主として、自動車のシートフレームやセンターピラー等の補強材など、主に内装材に使用されてきた。しかし、近年の自動車産業においては、更なる軽量化や安全性の向上を目指して、高張力鋼板をピラーアウターやサイメンアウターなどの外装材として適用する要請が拡大してきている。 Conventionally, high-tensile steel sheets have been mainly used for interior materials such as reinforcing materials such as automobile seat frames and center pillars. However, in the automobile industry in recent years, there has been an increasing demand for applying high-tensile steel plates as exterior materials such as pillar outers and cycle outers in order to further reduce weight and improve safety.
一方で、上記ピラーアウターやサイメンアウターなどの部品は形状も複雑であり、これらに使用される高張力鋼板は、高い成形性を有すると共に、化成処理性に優れることが求められる。そこで、高張力鋼板に高い成形性や、優れた化成処理性を持たせるため、高張力鋼板に添加されるＳｉやＭｎなどの添加物の量を所定の範囲内とするように調整が行われている。 On the other hand, parts such as the above-mentioned pillar outer and cycle outer are also complicated in shape, and high-tensile steel plates used for these are required to have high formability and excellent chemical conversion properties. Therefore, in order to give the high-tensile steel sheet high formability and excellent chemical conversion treatment, adjustments are made so that the amount of additives such as Si and Mn added to the high-tensile steel sheet is within a predetermined range. ing.
例えば、特開２００３−１９３１９２号公報（特許文献１）には、成形性と化成処理性に優れる高強度鋼板およびその製造方法について記載されている。ここでは、質量％で、Ｃ：0.01〜0.30％、Ｓｉ：0.005〜0.2％、Ｍｎ：0.1〜2.2％、Ｐ：0.001〜0.06％、Ｓ：0.001〜0.01％、Ｎ：0.0005〜0.01％、Ａｌ：0.25〜1.8％を含有し、残部Ｆｅおよび不可避不純物からなる高強度鋼板において、鋼成分の最適化、すなわち、ＳｉやＡｌの添加量、及び、ＴＳ狙い値（強度設計値）のバランスを特定範囲とすることで、成形性と化成処理性が向上するとしている。なお、前記特許文献１では、特にＡｌ添加量を調整することで、従来の残留オーステナイト鋼並に準ずる程度に延性が向上し、また、Ｓｉを低減することにより化成処理性を向上させ、さらに合金化めっきをおこなっても特性が劣化することが少ない高強度鋼板が提供できるとしている。
鋼板に含有されるＳｉやＭｎなどの添加物は、鉄の還元領域での焼鈍過程においても非常に酸化され易い。そのため、特に、質量％で、Ｓｉを０．１％以上、及び／又は、Ｍｎを１．０％以上含有する鋼板を焼鈍する場合、Ｓｉ酸化物やＭｎ酸化物が鋼板表面に濃化、析出し、鋼板表面の変色、或いは化成処理性の劣化という問題を生じさせる。 Additives such as Si and Mn contained in the steel sheet are very easily oxidized even in the annealing process in the reduction region of iron. Therefore, in particular, when annealing a steel sheet containing 0.1% or more of Si and / or 1.0% or more of Mn by mass%, Si oxide or Mn oxide is concentrated and precipitated on the steel sheet surface. However, it causes problems such as discoloration of the steel sheet surface or deterioration of chemical conversion treatment.
従来、高張力鋼板は、主に補強材等の内装材として使用されていたため、表面の変色や化成処理性は特に問題視されることが無かった。しかし、最近、高張力鋼板の外装材への適応が拡大しつつあり、鋼板表面の変色及び化成処理性の劣化が大きな問題となってきた。 Conventionally, high-strength steel sheets have been mainly used as interior materials such as reinforcing materials, and therefore, surface discoloration and chemical conversion treatment have not been particularly problematic. However, recently, the application of high-strength steel sheets to exterior materials has been expanding, and discoloration of the steel sheet surface and deterioration of chemical conversion treatment have become major problems.
鋼板表面の変色や化成処理性の劣化の問題は、焼鈍後に酸洗を行うことや、表面にＮｉメッキを行うことにより改善することが可能であるが、コストがかかるなどの問題がある。 The problem of discoloration of the steel sheet surface and deterioration of chemical conversion treatment can be improved by pickling after annealing or Ni plating on the surface, but there are problems such as high costs.
また、前記特許文献１に記載されている方法は、鋼板にＡｌを含有することを前提としているが、Ａｌを含有するとＡｌＮが粒界偏析し、高温脆化が発生してスラブ割れの原因となる。また、酸洗ライン等の連続ライン入側での溶接性を悪化させるという問題があり、好ましくない。 The method described in Patent Document 1 is based on the premise that the steel sheet contains Al, but if Al is contained, AlN segregates at the grain boundaries, causing high-temperature embrittlement and causing slab cracking. Become. Moreover, there exists a problem of degrading the weldability in the continuous line entrance side, such as a pickling line, and is unpreferable.
そこで、本発明は、冷延鋼板の製造、特に高張力鋼板の製造において、製造コストを増大させることなく、鋼板表面の変色及び化成処理性の劣化を防止することが可能な冷延鋼板の製造方法を提供することを目的とする。 Accordingly, the present invention provides a cold-rolled steel sheet that can prevent discoloration of the steel sheet surface and deterioration of chemical conversion treatment without increasing the manufacturing cost in the manufacture of cold-rolled steel sheets, particularly high-tensile steel sheets. It aims to provide a method.
本発明者等は、高張力鋼板の製造過程において、鋼板表面の変色及び化成処理性の劣化がどのように発生するのかについて検討した。 The present inventors examined how discoloration of the steel sheet surface and deterioration of chemical conversion treatment occur in the manufacturing process of the high-tensile steel sheet.
図４に、高張力鋼板として、例えば、後述する表１中のＡで示す成分系の鋼板を製造した場合において、焼鈍工程終了後に表面の変色及び化成処理性の劣化が起こっている鋼板の表面から内部へかけての元素分析を行った結果を示す。 In FIG. 4, for example, when a steel sheet having a component system indicated by A in Table 1 described below is manufactured as a high-strength steel sheet, the surface of the steel sheet undergoes surface discoloration and chemical conversion treatment deterioration after the annealing process is completed. The result of the elemental analysis from to the inside is shown.
図４に示すように、鋼板の表面近傍には、Ｓｉ及びＭｎの酸化物による表層濃化が起こっており、これが、化成処理性の劣化を引き起こす原因と推測される。 As shown in FIG. 4, surface layer concentration by the oxides of Si and Mn occurs in the vicinity of the surface of the steel sheet, and this is presumed to cause the deterioration of chemical conversion treatment.
また、図５に高張力鋼板として、例えば、後述する表１中のＡで示す成分系の鋼板を製造した場合において、焼鈍工程終了後に表面の変色及び化成処理性の劣化が起こっている鋼板の表面ＳＥＭ像を示す。 Further, as a high-strength steel plate in FIG. 5, for example, in the case where a component steel plate indicated by A in Table 1 described later is manufactured, the discoloration of the surface and the deterioration of the chemical conversion treatment property are caused after the annealing process is finished. A surface SEM image is shown.
図５より、変色のあった鋼板の表面には、１μｍ以下の細かい突起が無数にあることがわかる。これは、Ｓｉ、Ｍｎが表面濃化される際、粒界を伝って表面に到達するので、表面粒界に沿って雫状にＳｉ、Ｍｎ酸化物が生成されたためである。これらの凹凸が光の乱反射を生み出し鋼板表面の変色を引き起こすと推測される。 From FIG. 5, it can be seen that the surface of the discolored steel sheet has innumerable fine protrusions of 1 μm or less. This is because when Si and Mn are concentrated on the surface, they reach the surface through the grain boundary, so that Si and Mn oxides are generated in a bowl shape along the surface grain boundary. It is speculated that these irregularities cause irregular reflection of light and cause discoloration of the steel sheet surface.
鋼板表面近傍にＳｉ及びＭｎの酸化物の表層濃化が起こる原因は、焼鈍工程で一般的に用いられている炉内雰囲気において、Ｆｅは還元されるのに対し、Ｓｉ及びＭｎは酸化されるため、鋼板表面近傍にＳｉ酸化物及びＭｎ酸化物の濃化が起こり、それが鋼板表面の変色及び化成処理性の劣化を引き起こしたと考えられる。 The reason why the surface concentration of oxides of Si and Mn occurs in the vicinity of the steel sheet surface is that Fe is reduced while Si and Mn are oxidized in the furnace atmosphere generally used in the annealing process. Therefore, it is considered that concentration of Si oxide and Mn oxide occurred in the vicinity of the steel sheet surface, which caused discoloration of the steel sheet surface and deterioration of chemical conversion treatment.
そこで、鋼板表面へのＳｉ酸化物及びＭｎ酸化物の濃化を抑制する方法として、次の方法を用いた。まず、焼鈍工程における熱処理を行う際に、鉄の酸化雰囲気下で熱処理を行い、鋼板表面に酸化膜を形成させる。この際、鉄の酸化雰囲気では、鋼板表面には主に酸化鉄の層が形成され、それと比較して添加元素であるＳｉやＭｎの酸化物が生成される量は微量であるため、Ｓｉ酸化物及びＭｎ酸化物が鋼板表面近傍で濃化することがない。 Then, the following method was used as a method of suppressing concentration of Si oxide and Mn oxide on the steel plate surface. First, when performing heat treatment in the annealing step, heat treatment is performed in an iron oxidizing atmosphere to form an oxide film on the surface of the steel sheet. At this time, in an iron oxidizing atmosphere, a layer of iron oxide is mainly formed on the surface of the steel sheet. Compared with this, the amount of oxides of additive elements such as Si and Mn is very small. The product and Mn oxide are not concentrated near the steel sheet surface.
その後、その鋼板を鉄の還元雰囲気下に置くことで、酸化鉄は還元され、表面にはＦｅの還元層が形成される。その結果、鋼板表面へのＳｉ酸化物及びＭｎ酸化物の濃化は抑制され、鋼板表面の変色及び化成処理性の劣化を防止できる。 Thereafter, by placing the steel sheet in an iron reducing atmosphere, the iron oxide is reduced, and a reduced layer of Fe is formed on the surface. As a result, concentration of Si oxide and Mn oxide on the steel sheet surface is suppressed, and discoloration of the steel sheet surface and deterioration of chemical conversion treatment can be prevented.
本発明は、以上のような知見に基づいてなされたものであり、以下のような特徴を有する。
［１］ 質量％で、Ｓｉを０．１％以上、及び／又は、Ｍｎを１．０％以上含有する冷延鋼板の製造方法であって、
鋼板温度４００℃以上で、鉄の酸化雰囲気下で鋼板表面に酸化膜を形成させ、その後、鉄の還元雰囲気下で前記鋼板表面の酸化膜を還元する
ことを特徴とする冷延鋼板の製造方法。
［２］ 質量％で、Ｓｉを０．１％以上、及び／又は、Ｍｎを１．０％以上含有する冷延鋼板の製造方法であって、
直火バーナを備えた加熱炉内の鋼板温度４００℃以上で、空気比０．９３以上１．１０以下の直火バーナにて鋼板を加熱して鋼板表面に酸化膜を形成させ、その後、ラジアントチューブバーナを備えた還元雰囲気の均熱炉内で前記鋼板表面の酸化膜を還元することを特徴とする冷延鋼板の製造方法。
［３］ 質量％で、Ｓｉを０．１％以上、及び／又は、Ｍｎを１．０％以上含有する冷延鋼板の製造方法であって、
直火バーナを備えた加熱炉内の鋼板温度４００℃以上で、空気比０．９３以上１．３０以下の直火バーナにて鋼板を加熱して鋼板表面に酸化膜を形成させ、その後、空気比０．８９以下の直火バーナにて鋼板を加熱し、さらにラジアントチューブバーナを備えた還元雰囲気の均熱炉内で、前記鋼板表面の酸化膜を還元する
ことを特徴とする冷延鋼板の製造方法。
［４］ 上記［１］乃至［３］のいずれかにおいて、鋼板表面に形成される酸化膜の平均の厚さが０．０４〜０．２μｍであることを特徴とする冷延鋼板の製造方法。
The present invention has been made based on the above findings and has the following characteristics.
[1] A method for producing a cold-rolled steel sheet containing, by mass%, 0.1% or more of Si and / or 1.0% or more of Mn,
A method for producing a cold-rolled steel sheet, comprising forming an oxide film on a steel sheet surface in an iron oxidizing atmosphere at a steel sheet temperature of 400 ° C. or higher, and thereafter reducing the oxide film on the steel sheet surface in an iron reducing atmosphere. .
[2] A method for producing a cold-rolled steel sheet containing, in mass%, 0.1% or more of Si and / or 1.0% or more of Mn,
The steel sheet is heated in a direct fire burner with an air ratio of 0.93 or more and 1.10 or less to form an oxide film on the steel sheet surface at a temperature of 400 ° C. or higher in a heating furnace equipped with a direct fire burner, and then radiant A method for producing a cold-rolled steel sheet, comprising reducing an oxide film on the surface of the steel sheet in a soaking furnace in a reducing atmosphere equipped with a tube burner.
[3] A method for producing a cold-rolled steel sheet containing, by mass%, 0.1% or more of Si and / or 1.0% or more of Mn,
A steel plate temperature in a heating furnace equipped with a direct fire burner is 400 ° C. or higher, and the steel plate is heated with a direct fire burner having an air ratio of 0.93 or more and 1.30 or less to form an oxide film on the steel plate surface. A steel sheet is heated by a direct-fired burner having a ratio of 0.89 or less, and an oxide film on the surface of the steel sheet is reduced in a soaking furnace in a reducing atmosphere equipped with a radiant tube burner. Production method.
[4] The method for producing a cold-rolled steel sheet according to any one of the above [1] to [3], wherein an average thickness of an oxide film formed on the steel sheet surface is 0.04 to 0.2 μm. .
本発明によれば、冷延鋼板の製造、特に高張力鋼板の製造において、製造コストを増大させることなく、鋼板表面の変色及び化成処理性の劣化を防止することが可能な冷延鋼板の製造方法が提供される。 According to the present invention, in the production of cold-rolled steel sheets, particularly in the production of high-tensile steel sheets, the production of cold-rolled steel sheets capable of preventing discoloration of the steel sheet surface and deterioration of chemical conversion treatment properties without increasing the production cost. A method is provided.
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.
図１は、本発明にかかる冷延鋼板の製造方法が適用される、連続焼鈍ラインの構成の一例を示した図である。図１に示すように、この連続焼鈍ラインは、鋼板１を所定温度まで加熱するための加熱炉２と、前記加熱した鋼板１を所定温度で所定時間熱処理するための均熱炉３とを有している。図１において、洗浄工程（図示せず）から焼鈍工程に入る鋼板１は、まず加熱炉２内で所定の温度まで加熱される。その後、均熱炉３内で、所定温度で所定時間熱処理された後、冷却され次の工程に送られる。 Drawing 1 is a figure showing an example of composition of a continuous annealing line to which a manufacturing method of a cold-rolled steel sheet concerning the present invention is applied. As shown in FIG. 1, this continuous annealing line has a heating furnace 2 for heating the steel plate 1 to a predetermined temperature and a soaking furnace 3 for heat-treating the heated steel plate 1 at a predetermined temperature for a predetermined time. is doing. In FIG. 1, a steel plate 1 entering an annealing process from a cleaning process (not shown) is first heated to a predetermined temperature in a heating furnace 2. Then, after heat-treating for a predetermined time at a predetermined temperature in the soaking furnace 3, it is cooled and sent to the next step.
ここで、前記加熱炉２としては、加熱手段として直火バーナを備えた加熱炉が用いられる。また、前記均熱炉３としては、加熱手段としてラジアントチューブバーナを備えた加熱炉が用いられる。 Here, as the heating furnace 2, a heating furnace provided with a direct fire burner is used as a heating means. As the soaking furnace 3, a heating furnace provided with a radiant tube burner is used as a heating means.
このような連続焼鈍ラインにおいて本発明にかかる第一の実施形態は、質量％で、Ｓｉを０．１％以上、及び／又は、Ｍｎを１．０％以上含有する高張力冷延鋼板の製造方法であって、直火バーナを備えた加熱炉内の鋼板温度４００℃以上で、空気比０．９３以上１．３０以下の直火バーナにて鋼板を加熱し、鋼板表面に酸化膜を形成させる。その後、ラジアントチューブバーナを備えた還元雰囲気の均熱炉３内で、前記鋼板表面の酸化膜を還元するものである。 In such a continuous annealing line, the first embodiment according to the present invention is the production of a high-tensile cold-rolled steel sheet containing, by mass%, Si of 0.1% or more and / or Mn of 1.0% or more. This is a method in which a steel plate is heated at a temperature of 400 ° C. or more in a heating furnace equipped with a direct fire burner and an air ratio of 0.93 or more and 1.30 or less to form an oxide film on the surface of the steel plate. Let Thereafter, the oxide film on the surface of the steel sheet is reduced in a soaking furnace 3 in a reducing atmosphere equipped with a radiant tube burner.
加熱炉２内では、鋼板温度４００℃以上の温度領域において、鋼板表面における酸化が活発化する。ここで、Ｓｉ及びＭｎはＦｅと比較して圧倒的に酸化されやすく、通常の加熱炉雰囲気であるＦｅの還元雰囲気下では、高張力鋼板中のＳｉ及びＭｎの酸化が優先的に行われ、鋼板表面にＳｉ酸化物及びＭｎ酸化物の濃化が起こる。 In the heating furnace 2, oxidation on the steel sheet surface is activated in a temperature region where the steel sheet temperature is 400 ° C. or higher. Here, Si and Mn are overwhelmingly easier to oxidize than Fe, and in the reducing atmosphere of Fe, which is a normal heating furnace atmosphere, Si and Mn in the high-tensile steel plate are preferentially oxidized, Concentration of Si oxide and Mn oxide occurs on the steel plate surface.
そこで、本実施形態においては、直火バーナを備えた加熱炉内の鋼板温度４００℃以上で、空気比０．９３以上１．１０以下の直火バーナにて鋼板を加熱して、鉄の酸化膜を形成するものである。 Therefore, in the present embodiment, the steel plate is heated in a direct fire burner with a steel plate temperature of 400 ° C. or more in a heating furnace equipped with a direct fire burner and an air ratio of 0.93 or more and 1.10 or less to oxidize iron. A film is formed.
前記直火バーナの空気比を０．９３以上１．１０以下とすることで、この直火バーナの近傍における加熱炉２内の雰囲気は、未燃酸素が多く存在する鉄の酸化雰囲気となる。そのため、含有量の少ないＳｉ及びＭｎの酸化物が生成される量は微量であり、鋼板表面には主に酸化鉄の層が形成される。その結果、Ｓｉ酸化物及びＭｎ酸化物が鋼板表面近傍で濃化することを防止できる。 By setting the air ratio of the direct fire burner to 0.93 or more and 1.10 or less, the atmosphere in the heating furnace 2 in the vicinity of the direct fire burner becomes an iron oxidizing atmosphere containing a large amount of unburned oxygen. Therefore, the amount of Si and Mn oxides with a small content is very small, and an iron oxide layer is mainly formed on the steel sheet surface. As a result, it is possible to prevent Si oxide and Mn oxide from being concentrated near the steel sheet surface.
ここで、前記直火バーナの空気比を０．９３より小さくすると、未燃酸素が減少し、鋼板表面の鉄分を十分に酸化させることができず、Ｓｉ酸化物及びＭｎ酸化物が鋼板表面近傍で濃化してしまう。また、前記直火バーナの空気比を１．１０より大きくした場合、鋼板表面に厚い酸化物を生成させた状態で炉内ロールに接触するため、炉内ロールに酸化物が堆積し、いわゆるピックアップが発生する。そしてこのピックアップによって、炉内を搬送される鋼板に押し疵が発生する。 Here, when the air ratio of the direct fire burner is smaller than 0.93, unburned oxygen is reduced, iron on the steel sheet surface cannot be sufficiently oxidized, and Si oxide and Mn oxide are in the vicinity of the steel sheet surface. It will thicken. Further, when the air ratio of the direct fire burner is larger than 1.10, the oxide is deposited on the in-furnace roll because it contacts the in-furnace roll in a state where a thick oxide is generated on the steel plate surface, so-called pickup. Will occur. And by this pick-up, pressing iron is generated in the steel sheet conveyed in the furnace.
また、前記鋼板表面に形成される鉄の酸化膜の厚さは、Ｓｉ酸化物及びＭｎ酸化物が鋼板表面近傍で濃化することを抑制し、且つ、次工程の均熱炉において十分還元できる約０．０４〜０．２μｍとすることが好ましい。 Further, the thickness of the iron oxide film formed on the steel sheet surface suppresses the concentration of Si oxide and Mn oxide in the vicinity of the steel sheet surface, and can be sufficiently reduced in a soaking furnace in the next step. The thickness is preferably about 0.04 to 0.2 μm.
本実施形態においては、前記鋼板表面に鉄の酸化膜を形成させた後、ラジアントチューブバーナを備えた還元雰囲気の均熱炉３内で、前記鋼板表面の鉄の酸化膜を還元させる。 In this embodiment, after an iron oxide film is formed on the steel plate surface, the iron oxide film on the steel plate surface is reduced in a soaking furnace 3 in a reducing atmosphere equipped with a radiant tube burner.
以上により、焼鈍後の酸洗の実施や、鋼板表面にＮｉメッキを施すことなく鋼板表面の変色及び化成処理性の劣化を防止することが可能となる。 As described above, it becomes possible to prevent pickling after annealing and discoloration of the steel sheet surface and deterioration of chemical conversion treatment properties without performing Ni plating on the steel sheet surface.
また、図１に示す連続焼鈍ラインにおいて本発明の第二の実施形態は、質量％で、Ｓｉを０．１％以上、及び／又は、Ｍｎを１．０％以上含有する冷延鋼板の製造方法であって、直火バーナを備えた加熱炉２内の鋼板温度４００℃以上の温度領域で、空気比０．９３以上１．３０以下の直火バーナにて鋼板表面を加熱し、鋼板表面に酸化膜を形成させる。その後、加熱炉２に備えた空気比０．８９以下の直火バーナにて鋼板表面を加熱して酸化膜を還元させ、さらに、ラジアントチューブバーナを備えた還元雰囲気の均熱炉３内で、前記鋼板表面の酸化膜が還元されるまで熱処理を行うものである。 Moreover, in the continuous annealing line shown in FIG. 1, the second embodiment of the present invention is a production of a cold-rolled steel sheet containing, by mass%, 0.1% or more of Si and / or 1.0% or more of Mn. A method of heating a steel plate surface with a direct fire burner having an air ratio of 0.93 or more and 1.30 or less in a temperature range of a steel plate temperature of 400 ° C. or more in a heating furnace 2 equipped with a direct fire burner, An oxide film is formed. Thereafter, the surface of the steel sheet is heated by a direct fire burner with an air ratio of 0.89 or less provided in the heating furnace 2 to reduce the oxide film, and further, in a soaking furnace 3 in a reducing atmosphere equipped with a radiant tube burner, Heat treatment is performed until the oxide film on the steel sheet surface is reduced.
本実施形態においては、まず、加熱炉２の鋼板温度４００℃以上の温度領域において、鋼板の進行方向上流側に備えた空気比０．９３以上１．３０以下の直火バーナにて鋼板表面を加熱し、鉄の酸化膜を形成するものである。 In the present embodiment, first, in the temperature range of the steel plate temperature of the heating furnace 2 of 400 ° C. or higher, the steel plate surface is covered with a direct fire burner with an air ratio of 0.93 or more and 1.30 or less provided on the upstream side in the traveling direction of the steel plate. By heating, an iron oxide film is formed.
前記直火バーナの空気比を０．９３以上１．３０以下とすることで、この直火バーナの近傍における加熱炉２内の雰囲気は、未燃酸素が多く存在する鉄の酸化雰囲気となる。そのため、含有量の少ないＳｉ及びＭｎの酸化物が生成される量は微量であり、鋼板表面には主に酸化鉄の層が形成される。その結果、Ｓｉ酸化物及びＭｎ酸化物が鋼板表面近傍で濃化することを防止できる。 By setting the air ratio of the direct fire burner to 0.93 or more and 1.30 or less, the atmosphere in the heating furnace 2 in the vicinity of the direct fire burner becomes an iron oxidizing atmosphere in which a large amount of unburned oxygen exists. Therefore, the amount of Si and Mn oxides with a small content is very small, and an iron oxide layer is mainly formed on the steel sheet surface. As a result, it is possible to prevent Si oxide and Mn oxide from being concentrated near the steel sheet surface.
ここで、前記直火バーナの空気比を０．９３より小さくすると、未燃酸素が減少し、鋼板表面の鉄分を十分に酸化させることができず、Ｓｉ酸化物及びＭｎ酸化物が鋼板表面近傍で濃化してしまう。 Here, when the air ratio of the direct fire burner is smaller than 0.93, unburned oxygen is reduced, iron on the steel sheet surface cannot be sufficiently oxidized, and Si oxide and Mn oxide are in the vicinity of the steel sheet surface. It will thicken.
さらに、本実施形態においては、前記鋼板表面に鉄の酸化膜を形成させた後、引き続き前記加熱炉２の鋼板の進行方向下流側に備えた空気比を０．８９以下とした直火バーナで熱処理を行う。 Further, in the present embodiment, after an iron oxide film is formed on the steel plate surface, a direct fire burner in which the air ratio provided on the downstream side in the traveling direction of the steel plate of the heating furnace 2 is 0.89 or less is used. Heat treatment is performed.
ここで、直火バーナの空気比を０．８９以下とすることで、この直火バーナの近傍における加熱炉２内の雰囲気は未燃酸素がほとんど存在しない鉄の還元雰囲気となり、鋼板表面に形成された酸化鉄の少なくとも一部の還元を行う。これにより、前述の第一の実施形態の場合と比較して、空気比の上限が大きくなったことにより鋼板表面での酸化鉄の形成がより進んだ場合においても、炉内ロールへの接触時には、表層の酸化膜は還元されているのでピックアップ発生を押さえることが可能となる。ただし、前記上流側の直火バーナーの空気比を１．３０より大きくした場合、均熱炉で還元された後でも鋼板表面に残ってしまうような厚い酸化膜が形成されてしまうので不適である。 Here, by setting the air ratio of the direct fire burner to 0.89 or less, the atmosphere in the heating furnace 2 in the vicinity of the direct fire burner becomes an iron reducing atmosphere in which almost no unburned oxygen exists, and is formed on the surface of the steel plate. Reduction of at least a portion of the iron oxide formed. Thereby, as compared with the case of the first embodiment described above, even when the formation of iron oxide on the steel sheet surface is further advanced due to an increase in the upper limit of the air ratio, at the time of contact with the in-furnace roll Since the surface oxide film is reduced, it is possible to suppress the occurrence of pickup. However, if the air ratio of the upstream direct-fired burner is larger than 1.30, a thick oxide film that remains on the steel plate surface even after being reduced in a soaking furnace is not suitable. .
さらに、本実施形態においては、ラジアントチューブバーナを備えた還元雰囲気の均熱炉３内で、前記鋼板表面の鉄の酸化膜を還元させる。 Furthermore, in this embodiment, the iron oxide film on the surface of the steel sheet is reduced in a soaking furnace 3 in a reducing atmosphere equipped with a radiant tube burner.
以上により、上述の第一の実施形態と同様に、焼鈍後の酸洗の実施や、鋼板表面にＮｉメッキを施すことなく鋼板表面の変色及び化成処理性の劣化を防止することが可能となる。 As described above, as in the first embodiment described above, it is possible to prevent pickling after annealing and discoloration of the steel sheet surface and deterioration of chemical conversion treatment without performing Ni plating on the steel sheet surface. .
なお、上記二つの実施形態においては、加熱炉２として直火バーナを備えた加熱炉を、また均熱炉３としてラジアントチューブバーナを備えた加熱炉を用いているが、これらの加熱炉方式はこれらに限定されるものではない。本発明の効果を奏するように鉄の酸化雰囲気や還元雰囲気に調整できるものであれば加熱方式はどのようなものであってもよく、例えば、加熱炉３としてラジアントチューブバーナを備えた加熱炉を用い、炉内雰囲気を鉄の酸化雰囲気に調整してもよい。 In the above two embodiments, a heating furnace provided with a direct fire burner is used as the heating furnace 2, and a heating furnace equipped with a radiant tube burner is used as the soaking furnace 3, but these heating furnace methods are It is not limited to these. Any heating method may be used as long as it can be adjusted to an iron oxidizing atmosphere or a reducing atmosphere so as to achieve the effects of the present invention. For example, a heating furnace provided with a radiant tube burner is used as the heating furnace 3. The furnace atmosphere may be adjusted to an iron oxidizing atmosphere.
図１に示す冷延鋼板の連続焼鈍ラインにおいて、以下表１に示す組成（単位は質量％）の高張力鋼板のサンプルＡ，Ｂ，Ｃを用いて、表２に示すバーナ空気比条件で熱処理を行い、鋼板表面の化成処理性及び表面性状の評価を行った。さらに、炉内ロールへのピックアップの有無の評価もあわせて行い、その評価結果を表２に記載した。 In the continuous annealing line of the cold-rolled steel sheet shown in FIG. 1, heat treatment is performed under the burner air ratio conditions shown in Table 2, using samples A, B, and C of the high-strength steel sheets having the composition (unit: mass%) shown in Table 1 below. Then, chemical conversion treatment properties and surface properties of the steel sheet surface were evaluated. Furthermore, the presence / absence of pickup on the in-furnace roll was also evaluated, and the evaluation results are shown in Table 2.
以下表２において、直火バーナ空気比の欄の前段とは、図１において図中イで示す加熱炉２の上流側の部分をいい、後段とは、図中ロで示す加熱炉２の下流側の部分をいう。 In Table 2 below, the first stage in the column of the direct flame burner air ratio means the upstream portion of the heating furnace 2 shown in FIG. 1 by “a” in the drawing, and the latter stage is the downstream of the heating furnace 2 shown in FIG. The side part.
上記表２において、ピックアップ性評価、化成処理性評価及び表面性状評価の評価基準を以下に示す。
［ピックアップ性評価］
○：炉内ロール２ａへのピックアップの発生がなかった場合
×：炉内ロール２ａへのピックアップの発生があった場合
［化成処理性評価］
○：質量％で、Ｓｉの含有量０．１％未満、及び、Ｍｎの含有量１．０％未満である一般冷延鋼板と比較してリン酸亜鉛処理後のリン酸塩付着量が同等の場合
×：質量％で、Ｓｉの含有量０．１％未満、及び、Ｍｎの含有量１．０％未満である一般冷延鋼板と比較してリン酸亜鉛処理後のリン酸塩付着量が少ない場合
［表面性状評価］
○：変色が自動車外装材として使用できる程度
×：変色が自動車外装材として不適な場合
表２に示すように、本発明例に関しては、鋼板表面の変色及び化成処理性の劣化は見られず、また、炉内ロールへのピックアップも見られなかった。
In Table 2 above, evaluation criteria for pickup property evaluation, chemical conversion property evaluation, and surface property evaluation are shown below.
[Pickup evaluation]
◯: When there is no pickup to the in-furnace roll 2a ×: When there is pickup to the in-furnace roll 2a [chemical conversion treatment evaluation]
○: The amount of phosphate adhering after zinc phosphate treatment is the same as that of general cold-rolled steel sheets with mass%, Si content less than 0.1%, and Mn content less than 1.0%. In the case of x: The amount of phosphate adhering after zinc phosphate treatment in comparison with a general cold-rolled steel sheet having mass%, Si content less than 0.1% and Mn content less than 1.0% When there is little [Evaluation of surface properties]
○: Degree of discoloration that can be used as an automobile exterior material ×: When discoloration is unsuitable as an automobile exterior material As shown in Table 2, regarding the present invention example, no discoloration of the steel sheet surface and deterioration of chemical conversion treatment property were observed. In addition, pickup to the in-furnace roll was not observed.
図２に、上記表２中の本発明例１に示す鋼板の焼鈍工程終了後における鋼板表面から内部へかけての元素分析を行った結果を示す。前述の図４に示す、焼鈍工程終了後に表面の変色及び化成処理性の劣化が起こっている鋼板の表面から内部へかけての元素分析を行った結果と比較すると、鋼板表面近傍でのＳｉ酸化物及びＭｎ酸化物の濃度が低く抑えられていることが確認できた。 In FIG. 2, the result of having conducted the elemental analysis from the steel plate surface to the inside after the completion | finish of the annealing process of the steel plate shown in this invention example 1 in the said Table 2 is shown. Compared with the result of the elemental analysis from the surface of the steel sheet where the discoloration of the surface and the deterioration of the chemical conversion treatment have occurred after the annealing process shown in FIG. It was confirmed that the concentration of the product and Mn oxide was kept low.
また、図３に、上記表２中の本発明例１及び比較例４に示す鋼板の焼鈍工程終了後における化成処理性評価の結果として、リン酸亜鉛浴浸漬時間を変化させた場合のリン酸亜鉛処理後の鋼板表面へのリン酸塩付着量を、Ｓｉの含有量０．１％未満、及び、Ｍｎの含有量１．０％未満である一般冷延鋼板と比較した結果を示す。図３に示すように、本発明例１の場合は、一般冷延鋼板とほぼ同等の化成処理性が得られていることが確認できた。 Moreover, in FIG. 3, phosphoric acid when the zinc phosphate bath immersion time is changed as a result of the chemical conversion treatment evaluation after the annealing process of the steel sheet shown in Invention Example 1 and Comparative Example 4 in Table 2 above is completed. The result of having compared the phosphate adhesion amount to the steel plate surface after zinc processing with the general cold-rolled steel plate which is less than 0.1% of Si content and less than 1.0% of Mn content is shown. As shown in FIG. 3, in the case of this invention example 1, it has confirmed that the chemical conversion property substantially equivalent to a general cold-rolled steel plate was acquired.
１ 鋼板
２ 加熱炉
３ 均熱炉
1 Steel plate 2 Heating furnace 3 Soaking furnace
Claims (4)
鋼板温度４００℃以上で、鉄の酸化雰囲気下で鋼板表面に酸化膜を形成させ、その後、鉄の還元雰囲気下で前記鋼板表面の酸化膜を還元する
ことを特徴とする冷延鋼板の製造方法。 A method for producing a cold-rolled steel sheet containing, in mass%, 0.1% or more of Si and / or 1.0% or more of Mn,
A method for producing a cold-rolled steel sheet, comprising forming an oxide film on a steel sheet surface in an iron oxidizing atmosphere at a steel sheet temperature of 400 ° C. or higher, and thereafter reducing the oxide film on the steel sheet surface in an iron reducing atmosphere. .
直火バーナを備えた加熱炉内の鋼板温度４００℃以上で、空気比０．９３以上１．１０以下の直火バーナにて鋼板を加熱して鋼板表面に酸化膜を形成させ、その後、ラジアントチューブバーナを備えた還元雰囲気の均熱炉内で前記鋼板表面の酸化膜を還元することを特徴とする冷延鋼板の製造方法。 A method for producing a cold-rolled steel sheet containing, in mass%, 0.1% or more of Si and / or 1.0% or more of Mn,
The steel sheet is heated in a direct fire burner with an air ratio of 0.93 or more and 1.10 or less to form an oxide film on the steel sheet surface at a temperature of 400 ° C. or higher in a heating furnace equipped with a direct fire burner, and then radiant A method for producing a cold-rolled steel sheet, comprising reducing an oxide film on the surface of the steel sheet in a soaking furnace with a tube burner in a reducing atmosphere.
直火バーナを備えた加熱炉内の鋼板温度４００℃以上で、空気比０．９３以上１．３０以下の直火バーナにて鋼板を加熱して鋼板表面に酸化膜を形成させ、その後、空気比０．８９以下の直火バーナにて鋼板を加熱し、さらにラジアントチューブバーナを備えた還元雰囲気の均熱炉内で、前記鋼板表面の酸化膜を還元する
ことを特徴とする冷延鋼板の製造方法。 A method for producing a cold-rolled steel sheet containing, in mass%, 0.1% or more of Si and / or 1.0% or more of Mn,
A steel plate temperature in a heating furnace equipped with a direct fire burner is 400 ° C. or higher, and the steel plate is heated with a direct fire burner having an air ratio of 0.93 or more and 1.30 or less to form an oxide film on the steel plate surface. A steel sheet is heated by a direct-fired burner having a ratio of 0.89 or less, and an oxide film on the surface of the steel sheet is reduced in a soaking furnace in a reducing atmosphere equipped with a radiant tube burner. Production method.
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| JP5218386B2 (en) * | 2009-12-22 | 2013-06-26 | Ｊｆｅスチール株式会社 | Cold rolled steel sheet manufacturing method |
| CN105177413A (en) * | 2015-08-31 | 2015-12-23 | 铜陵市大明玛钢有限责任公司 | High-Si cold-rolled steel plate for vehicle manufacturing |
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