JP2003105445A - Method for heating and forming plated steel sheet with superior appearance - Google Patents
Method for heating and forming plated steel sheet with superior appearanceInfo
- Publication number
- JP2003105445A JP2003105445A JP2001299181A JP2001299181A JP2003105445A JP 2003105445 A JP2003105445 A JP 2003105445A JP 2001299181 A JP2001299181 A JP 2001299181A JP 2001299181 A JP2001299181 A JP 2001299181A JP 2003105445 A JP2003105445 A JP 2003105445A
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- Japan
- Prior art keywords
- steel sheet
- heating
- plated steel
- oxygen concentration
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、高い機械強度と優
れたプレス成形性を両立するための高温プレス成形に使
用する加熱成形用鋼板の加熱成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot forming method for a hot forming steel sheet used in high temperature press forming for achieving both high mechanical strength and excellent press formability.
【０００２】[0002]
【従来の技術】近年、環境保護と地球温暖化を防止する
ため、化石燃料の消費を抑制する動きが強まっており、
移動手段として我々の生活に欠かせない自動車において
も車体の軽量化が強く求められている。この軽量化を達
成するためには、従来に比べ高い機械強度を有する材料
を使用することが必要となるが、一般に高い強度を有す
る材料は曲げ加工などの成形加工において形状凍結性が
低下する傾向にあり、また複雑な形状のものに対しては
成形そのものが困難である。これらの問題を解決する方
法のひとつとして鋼板を８００℃以上の高温に加熱し、
プレス加工を行った後冷却するいわゆる高温（ホット）
プレスによる方法が有望である。高温プレスに使用する
鋼板はめっきを行っていない材料を用いた場合、鋼板を
８００℃以上の高温に加熱するために表面に酸化物（ス
ケール）が発生し、それを取り除くための工程が必要と
なる。また、耐食性を必要とする部材などでは、表面に
防錆処理や金属被覆する必要があり、表面清浄化工程、
表面処理工程が必要となる。これらの欠点を克服する方
法として、特開２０００−３８６４０公報に開示されて
いるように、Ａｌ（アルミニウム）系の金属被覆を施し
た鋼板を用いる知見が示されている。2. Description of the Related Art In recent years, in order to protect the environment and prevent global warming, there is an increasing tendency to reduce the consumption of fossil fuels.
Even in automobiles, which are indispensable to our lives as a means of transportation, there is a strong demand for weight reduction of the vehicle body. In order to achieve this weight reduction, it is necessary to use a material having higher mechanical strength than that of the conventional one, but in general, a material having high strength tends to have a low shape fixability during forming such as bending. In addition, it is difficult to mold a complicated shape. As one of the methods to solve these problems, the steel plate is heated to a high temperature of 800 ° C or higher,
So-called high temperature (hot) cooling after press working
The press method is promising. When the steel plate used for high temperature pressing uses a material that is not plated, an oxide (scale) is generated on the surface to heat the steel plate to a high temperature of 800 ° C or higher, and a process for removing it is required. Become. Also, for members that require corrosion resistance, etc., it is necessary to rust-prevent or metal-coat the surface.
A surface treatment process is required. As a method for overcoming these drawbacks, as disclosed in Japanese Patent Laid-Open No. 2000-38640, it is known that a steel sheet coated with an Al (aluminum) -based metal is used.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
た加熱成形用鋼板では、目的とする材料強度は得られる
ものの、プレス加工前の予備加熱条件によっては、めっ
き表層に生成するＡｌとＦｅの金属間化合物の酸化物
（スケール）が発生し、外観を損ねると共に表面に塗装
が出来なくなるといった問題点があった。本発明はかか
る事情に鑑みてなされたもので、加熱時における金属間
化合物の酸化反応を制御することで美麗な外観を有し、
かつ優れた被塗装性を可能とする外観の優れためっき鋼
板の加熱成形方法を提供することを目的とする。However, although the above-mentioned hot-forming steel sheet can obtain the intended material strength, it may be formed between the Al and Fe metals formed in the plating surface layer depending on the preheating conditions before press working. There are problems that oxides (scales) of the compound are generated, impairing the appearance, and that the surface cannot be coated. The present invention has been made in view of such circumstances, and has a beautiful appearance by controlling the oxidation reaction of the intermetallic compound during heating,
It is also an object of the present invention to provide a hot forming method for a plated steel sheet having an excellent appearance that enables excellent coatability.
【０００４】[0004]
【課題を解決するための手段】前記目的に沿う第１の発
明に係る外観の優れためっき鋼板の加熱成形方法は、め
っきした鋼板を加熱時の雰囲気中の酸素濃度を２０％以
下として加熱して、高温成形している。また、第２の発
明に係る外観の優れためっき鋼板の加熱成形方法は、ア
ルミを主体とするめっき鋼板を、少なくとも４５０℃以
上の温度範囲の雰囲気中の酸素濃度を２０％以下として
加熱して、高温成形している。このようにめっきした鋼
板を成形加工するための加熱中の酸素濃度を設定するの
で、加熱中に形成されるめっき層と鋼板（Ｆｅ）の金属
間化合物の酸化による変色を防止することができる。According to a first aspect of the present invention, a hot forming method for a plated steel sheet having an excellent appearance according to the above object is carried out by heating a plated steel sheet with an oxygen concentration in an atmosphere during heating of 20% or less. And high temperature molding. Further, the hot forming method of a plated steel sheet having an excellent appearance according to the second aspect of the present invention heats a plated steel sheet mainly containing aluminum with an oxygen concentration of 20% or less in an atmosphere in a temperature range of at least 450 ° C. or higher. , High temperature molding. Since the oxygen concentration during heating for forming the plated steel sheet is set in this way, discoloration due to the oxidation of the intermetallic compound of the plating layer and the steel sheet (Fe) formed during heating can be prevented.
【０００５】[0005]
【発明の実施の形態】続いて、添付した図面を参照しつ
つ、本発明を具体化した実施の形態につき説明し、本発
明の理解に供する。ここに図１は本発明の一実施の形態
に係る外観の優れためっき鋼板の加熱成形方法を使用し
た加熱雰囲気の説明図、図２は同外観の優れためっき鋼
板の加熱成形方法を使用した変形例に係る加熱雰囲気の
説明図である。本発明の一実施の形態に係る外観の優れ
ためっき鋼板の加熱成形方法は、厚みが例えば１〜２ｍ
ｍ程度で、例えば自動車の製造に使用するめっきした鋼
板を、めっきに使用した金属の融点以上、例えば８００
〜１０００℃程度に加熱し、プレス加工（成形加工）を
行なった後冷却するいわゆる高温（ホット）プレスを行
なう場合に適用する方法で、鋼板の加熱を２０％以下の
酸素濃度の雰囲気下で行なう方法である。BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. Here, FIG. 1 is an explanatory view of a heating atmosphere using a hot forming method of a plated steel sheet having an excellent appearance according to an embodiment of the present invention, and FIG. 2 uses a heat forming method of a plated steel sheet having an excellent appearance. It is explanatory drawing of the heating atmosphere which concerns on a modification. In the hot forming method for a plated steel sheet having an excellent appearance according to one embodiment of the present invention, the thickness is, for example, 1 to 2 m.
At about m, for example, a plated steel sheet used for manufacturing automobiles is higher than the melting point of the metal used for plating, for example, 800
This method is applied when performing so-called high-temperature (hot) pressing in which the material is heated to about 1000 ° C., subjected to press working (forming work), and then cooled, and the steel sheet is heated in an atmosphere having an oxygen concentration of 20% or less. Is the way.
【０００６】なお、本実施の形態では、図１に示すよう
に、酸素濃度を２０％以下（例えば、１５％）として加
熱した。このめっきした鋼板は、例えば０．１５＜Ｃ＜
０．５、０．１５＜Ｍｎ＜０．５、０．１＜Ｓｉ＜０．
５、０．０１＜Ｃｒ＜１、Ｔｉ＜０．２、Ａｌ＜０．
１、Ｐ＜０．１、Ｓ＜０．０５、０．０００５＜Ｂ＜
０．０８の成分を有し、残部がＦｅと不可避的不純物で
構成されている。なお、単位はｗｔ％である。以下、詳
しく説明する。めっきに使用する金属としては、Ａｌを
主体とする金属として、例えば純Ａｌ、Ａｌ−１０Ｓ
ｉ、Ａｌ−Ｓｉ−Ｃｒ等を、また、Ｓｎを主体とする金
属として、例えば純Ｓｎやその合金等を使用できる。め
っきにＡｌを主体とする金属を使用した場合、鋼板を加
熱することで、めっき皮膜（この実施の形態では５〜３
０μｍ程度の厚み）の表層部に、Ａｌと鋼板の成分であ
るＦｅとの金属間化合物、例えばＦｅＡｌ3 が形成され
る。この金属間化合物は耐酸化性がＡｌに比べて劣る
が、加熱時の酸素濃度を１５％としているため、前記金
属間化合物が酸化されることを防止できる。また、図２
に示すように、めっきにＡｌを主体とする金属を使用し
た場合、Ａｌそのものは良好な耐酸化性を有しているこ
とから、ＡｌとＦｅの金属間化合物が形成される温度
（ここでは４５０℃）以上の温度域のみ酸素濃度を２０
％以下とすれば金属間化合物の酸化を防止できる。In the present embodiment, as shown in FIG. 1, the oxygen concentration is heated to 20% or less (for example, 15%). This plated steel sheet has, for example, 0.15 <C <
0.5, 0.15 <Mn <0.5, 0.1 <Si <0.
5, 0.01 <Cr <1, Ti <0.2, Al <0.
1, P <0.1, S <0.05, 0.0005 <B <
It has a component of 0.08 and the balance is Fe and inevitable impurities. The unit is wt%. The details will be described below. As a metal used for plating, a metal mainly composed of Al, for example, pure Al or Al-10S
i, Al-Si-Cr, or the like, and as a metal mainly containing Sn, for example, pure Sn or an alloy thereof can be used. When a metal mainly composed of Al is used for plating, by heating the steel plate, the plating film (in this embodiment, 5 to 3
An intermetallic compound of Al and Fe, which is a component of the steel plate, for example, FeAl 3 is formed in the surface layer portion (thickness of about 0 μm). This intermetallic compound is inferior in oxidation resistance to Al, but since the oxygen concentration during heating is 15%, the intermetallic compound can be prevented from being oxidized. Also, FIG.
As shown in, when a metal mainly composed of Al is used for plating, since Al itself has good oxidation resistance, the temperature at which the intermetallic compound of Al and Fe is formed (here, 450). Oxygen concentration is 20 only in the temperature range above
If it is at most%, the oxidation of the intermetallic compound can be prevented.
【０００７】[0007]
【実施例】本発明に係る外観の優れためっき鋼板の加熱
成形方法を適用し、試験を行った結果について説明す
る。なお、ここではめっきした鋼板を成形加工するため
の加熱時に設定する最も好ましい条件、即ち常温から最
高加熱温度までの領域の全ての酸素濃度を２０％以下と
して試験を行った。熱間圧延、冷間圧延を経て製造され
た板厚１．２ｍｍの冷延鋼板（Ｃ：０．２０、Ｓｉ：
０．０２、Ｍｎ：０．１６、Ｐ：０．００９、Ｓ：０．
０１０、Ａｌ：０．０５、Ｔｉ：０．１２、Ｃｒ：０．
００３を有し、残部がＦｅと不可避的不純物からなる）
を無酸化炉・還元炉方式のラインを使用して７００〜８
００℃程度で還元焼鈍を行った後、表１に示すめっき浴
に浸漬して溶融めっきを行った。なお、鋼板中の各成分
の単位はｗｔ％である。EXAMPLES The results of tests conducted by applying the hot-forming method for plated steel sheets having an excellent appearance according to the present invention will be described. Here, the test was conducted under the most preferable conditions set during heating for forming the plated steel sheet, that is, the oxygen concentration in all the region from room temperature to the maximum heating temperature was 20% or less. Cold-rolled steel sheet (C: 0.20, Si: 1.2 mm in thickness) manufactured through hot rolling and cold rolling.
0.02, Mn: 0.16, P: 0.009, S: 0.
010, Al: 0.05, Ti: 0.12, Cr: 0.
003, with the balance consisting of Fe and unavoidable impurities)
700 to 8 using a non-oxidizing furnace / reducing furnace system line
After carrying out reduction annealing at about 00 ° C., it was immersed in a plating bath shown in Table 1 to carry out hot dip plating. The unit of each component in the steel sheet is wt%.
【０００８】[0008]
【表１】 [Table 1]
【０００９】鋼板をめっきした後は、ガスワイピングで
鋼板に対するめっき付着量を片面あたり５〜３０μｍに
調整した。このときのめっき組成は表１中の元素以外に
２ｗｔ％のＦｅが含まれていたが、Ｆｅは浴中の機器や
鋼板（ストリップ）から供給される不可避のものであ
る。このＡｌを主体とする金属及びＳｎを主体とする金
属でそれぞれめっきした鋼板を、９５０℃に温度設定し
た電気ヒーター炉に入れて表２、表３に示す酸素濃度雰
囲気で加熱し、熱処理した。こうして製造しためっき鋼
板について、熱処理後の鋼板の酸化状態と塗装密着性を
評価した。熱処理を行うための加熱手段としては交流に
よる直接通電加熱を用い、表２に示す加熱パターンで熱
処理を行った。なお、表２は本発明の実施例であり、表
３は比較例である。また、表２、表３中の表面酸化と
は、金属をめっきした鋼板の表面外観に変化がないも
の、即ち良品を○、鋼板の表面外観がブルーイング（酸
化膜による光の干渉色）が発生したもの、即ち不良品を
×とした。また表２、表３中の被塗装性とは、金属をめ
っきした鋼板の加熱、冷却後に電着塗装が可能なもの、
即ち良品を○、電着塗装が均一に付着しないもの、即ち
不良品を×とした。After the steel sheet was plated, the amount of coating adhered to the steel sheet was adjusted to 5 to 30 μm per side by gas wiping. The plating composition at this time contained 2 wt% of Fe in addition to the elements shown in Table 1, but Fe is unavoidable supplied from the equipment in the bath or the steel plate (strip). The steel plates plated with the metal mainly containing Al and the metal mainly containing Sn were placed in an electric heater furnace whose temperature was set to 950 ° C. and heated in an oxygen concentration atmosphere shown in Tables 2 and 3 to be heat-treated. With respect to the plated steel sheet thus manufactured, the oxidation state and coating adhesion of the steel sheet after heat treatment were evaluated. Direct heating by alternating current was used as the heating means for performing the heat treatment, and the heat treatment was performed according to the heating pattern shown in Table 2. Table 2 is an example of the present invention, and Table 3 is a comparative example. Further, the surface oxidation in Tables 2 and 3 means that the surface appearance of the steel sheet plated with metal does not change, that is, the good product is ◯, and the surface appearance of the steel sheet is bluing (light interference color due to the oxide film). The generated product, that is, the defective product was marked with x. Further, the coatability in Tables 2 and 3 means that the steel sheet plated with metal can be electrodeposited after heating and cooling,
That is, a good product was evaluated as ◯, and a product in which the electrodeposition coating did not uniformly adhere, that is, a defective product was evaluated as x.
【００１０】[0010]
【表２】 [Table 2]
【００１１】[0011]
【表３】 [Table 3]
【００１２】符号１から１０は、常温から９５０℃まで
の加熱の際の酸素濃度を全て２０％以下としているた
め、加熱時に形成される金属間化合物の酸化を防止で
き、すぐれた被塗装性が得られている。また、符号１１
から１３は、めっきに、いずれもＡｌを主体とした金属
を使用しているため、常温から４００℃までの加熱時の
酸素濃度が２１％であっても、金属間化合物の酸化を防
止でき、優れた被塗装性が得られている。一方符号１４
から２３は、いずれも前記温度域、とくに４５０℃以上
の温度域において酸素濃度が２１％と高く、被塗装性が
低下した。以上、本発明を、一実施の形態を参照して説
明してきたが、本発明は何ら上記した実施の形態に記載
の構成に限定されるものではなく、特許請求の範囲に記
載されている事項の範囲内で考えられるその他の実施の
形態や変形例も含むものである。例えば、前記実施の形
態においては、めっきに使用する金属として、Ａｌ及び
Ｓｎを主体とした金属を使用した場合について説明した
が、めっきに使用した金属の融点が、めっきした鋼板を
成形加工するための加熱時における最高加熱温度（例え
ば８００〜１０００℃程度）以下で、その金属から形成
される金属間化合物が成形加工時の加熱温度、即ち前記
最高加熱温度より高い融点を備えた金属であれば、すべ
て適用可能である。また、めっきした鋼板の加熱方法と
しては、特に限定されるものではなく、例えば誘導加
熱、赤外線加熱、燃焼炉等を使用することができる。更
に酸素濃度を低減する手段についても、特に限定される
ものではなく、例えば窒素、アルゴン、二酸化炭素等の
非酸化性ガスであれば、すべて適用可能である。Reference numerals 1 to 10 indicate that the oxygen concentration during heating from room temperature to 950 ° C. is not more than 20%, so that the intermetallic compound formed during heating can be prevented from being oxidized and excellent coatability can be obtained. Has been obtained. Also, reference numeral 11
Since Nos. 13 to 13 use a metal mainly composed of Al for plating, even if the oxygen concentration during heating from room temperature to 400 ° C. is 21%, oxidation of the intermetallic compound can be prevented, Excellent coatability is obtained. On the other hand, reference numeral 14
In Nos. 23 to 23, the oxygen concentration was as high as 21% in the above temperature range, particularly in the temperature range of 450 ° C. or higher, and the coatability was lowered. Although the present invention has been described with reference to the exemplary embodiment, the present invention is not limited to the configuration described in the above exemplary embodiment, and the matters described in the claims are included. Other embodiments and modified examples that are conceivable within the range are included. For example, in the above-described embodiment, the case where a metal mainly composed of Al and Sn is used as the metal used for plating has been described, but the melting point of the metal used for plating is for forming the plated steel plate. If the intermetallic compound formed from the metal has a maximum heating temperature (for example, about 800 to 1000 ° C.) at the time of heating, the heating temperature at the time of molding, that is, a metal having a melting point higher than the maximum heating temperature , All applicable. The method of heating the plated steel sheet is not particularly limited, and for example, induction heating, infrared heating, combustion furnace, etc. can be used. Further, the means for reducing the oxygen concentration is not particularly limited, and any non-oxidizing gas such as nitrogen, argon, carbon dioxide or the like can be applied.
【００１３】[0013]
【発明の効果】請求項１及び２記載の外観の優れためっ
き鋼板の加熱成形方法においては、めっきした鋼板を成
形加工するための加熱時に、所定の酸素濃度を設定する
ので、耐酸化性の劣る、めっきに使用した金属とＦｅの
金属間化合物が形成されても、酸化が抑制され、表面外
観が変化したり、被塗装性が低下することを防止でき
る。In the method of hot forming a plated steel sheet having an excellent appearance according to claims 1 and 2, a predetermined oxygen concentration is set at the time of heating for forming the plated steel sheet. Even if an inferior intermetallic compound of Fe and the metal used for plating is formed, it is possible to prevent oxidation, prevent a change in surface appearance, and a decrease in coatability.
【図１】本発明の一実施の形態に係る外観の優れためっ
き鋼板の加熱成形方法を使用した加熱雰囲気の説明図で
ある。FIG. 1 is an explanatory diagram of a heating atmosphere using a hot forming method for a plated steel sheet having an excellent appearance according to an embodiment of the present invention.
【図２】同外観の優れためっき鋼板の加熱成形方法を使
用した変形例に係る加熱雰囲気の説明図である。FIG. 2 is an explanatory view of a heating atmosphere according to a modified example using the hot forming method of a plated steel sheet having the same excellent appearance.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２３Ｃ 2/40 Ｃ２３Ｃ 2/40 Ｆターム(参考） 4K027 AA02 AB02 AB09 AB15 AB48 AC12 AC32 AC52 AC73 AD25 AE12 AE32 AE33 4K037 EA06 EA15 EA18 EA23 EA25 EA27 GA03 GA05 Front page continuation (51) Int.Cl. 7 Identification code FI theme code (reference) C23C 2/40 C23C 2/40 F term (reference) 4K027 AA02 AB02 AB09 AB15 AB48 AC12 AC32 AC52 AC73 AD25 AE12 AE32 AE33 4K037 EA06 EA15 EA18 EA23 EA25 EA27 GA03 GA05
Claims (2)
素濃度を２０％以下として加熱して、高温成形すること
を特徴とする外観の優れためっき鋼板の加熱成形方法。1. A hot forming method for a plated steel sheet having an excellent appearance, which comprises heating a plated steel sheet at an oxygen concentration of 20% or less in a heating atmosphere to perform high temperature forming.
くとも４５０℃以上の温度範囲の雰囲気中の酸素濃度を
２０％以下として加熱して、高温成形することを特徴と
する外観の優れためっき鋼板の加熱成形方法。2. A plated steel sheet having an excellent appearance, characterized in that a plated steel sheet containing aluminum as a main component is heated at a temperature of at least 450 ° C. in an atmosphere having an oxygen concentration of 20% or less to be hot-formed. Method of heat molding.
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| JP2001299181A JP4884622B2 (en) | 2001-09-28 | 2001-09-28 | Heat forming method for coated steel sheet with excellent appearance |
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| JP2001299181A JP4884622B2 (en) | 2001-09-28 | 2001-09-28 | Heat forming method for coated steel sheet with excellent appearance |
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| JP4884622B2 JP4884622B2 (en) | 2012-02-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008069398A (en) * | 2006-09-13 | 2008-03-27 | Sumitomo Metal Ind Ltd | Al-BASED PLATED HEAT-TREATED STEEL MATERIAL, AND ITS PRODUCTION METHOD |
| CN100404703C (en) * | 2003-08-29 | 2008-07-23 | 丰田铁工株式会社 | Heating treatment process of plated steel sheet for hot stamping |
| WO2010079995A3 (en) * | 2009-01-09 | 2010-09-30 | 주식회사 포스코 | Aluminum-plated steel sheet having superior corrosion resistance, hot press formed product using the same, and method for production thereof |
| KR101333977B1 (en) * | 2013-03-26 | 2013-12-02 | 현대하이스코 주식회사 | Hot stamping parts with excellent surface property and method of manufacturing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100404703C (en) * | 2003-08-29 | 2008-07-23 | 丰田铁工株式会社 | Heating treatment process of plated steel sheet for hot stamping |
| JP2008069398A (en) * | 2006-09-13 | 2008-03-27 | Sumitomo Metal Ind Ltd | Al-BASED PLATED HEAT-TREATED STEEL MATERIAL, AND ITS PRODUCTION METHOD |
| WO2010079995A3 (en) * | 2009-01-09 | 2010-09-30 | 주식회사 포스코 | Aluminum-plated steel sheet having superior corrosion resistance, hot press formed product using the same, and method for production thereof |
| KR101008042B1 (en) | 2009-01-09 | 2011-01-13 | 주식회사 포스코 | Aluminum Coated Steel Sheet with Excellent Corrosion Resistance and Hot Press Formed Article Using The Same and Manufacturing Method Thereof |
| KR101333977B1 (en) * | 2013-03-26 | 2013-12-02 | 현대하이스코 주식회사 | Hot stamping parts with excellent surface property and method of manufacturing the same |
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|---|---|
| JP4884622B2 (en) | 2012-02-29 |
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