JP2003034845A - Aluminum-base plated steel sheet for hot press superior in corrosion resistance and heat resistance, and member for automobile using it - Google Patents
Aluminum-base plated steel sheet for hot press superior in corrosion resistance and heat resistance, and member for automobile using itInfo
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- JP2003034845A JP2003034845A JP2001190707A JP2001190707A JP2003034845A JP 2003034845 A JP2003034845 A JP 2003034845A JP 2001190707 A JP2001190707 A JP 2001190707A JP 2001190707 A JP2001190707 A JP 2001190707A JP 2003034845 A JP2003034845 A JP 2003034845A
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- Prior art keywords
- corrosion resistance
- steel sheet
- steel
- aluminum
- heat resistance
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車の足回り等
の高強度を要求される部品を製造するための鋼素材、及
びそれを使用した自動車部品を提供するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a steel material for producing parts such as undercarriage of automobiles which are required to have high strength, and automobile parts using the same.
【０００２】[0002]
【従来の技術】近年、地球環境問題を発端とした低燃費
化の動きから自動車用鋼板に対しては高強度化に対する
要望が強い。しかし、一般に高強度化は加工性、成形性
の低下を伴い、高強度，高成形性を両立する鋼板が要望
されている。これに対する一つの回答は、残留オーステ
ナイトのマルテンサイト変態を利用したＴＲＩＰ（ＴＲ
ａｎｓｆｏｒｍａｔｉｏｎ Ｉｎｄｕｃｅｄ Ｐｌａｃ
ｉｔｉｃｉｔｙ）鋼であり、近年用途が拡大しつつあ
る。しかしこの鋼により、成形性の優れた１０００ＭＰ
ａ級の高強度鋼板は製造することは可能であるが、更に
高強度、例えば１５００ＭＰａというような超高強度鋼
で成形性を確保することは困難である。2. Description of the Related Art In recent years, there has been a strong demand for high strength steel sheets for automobiles due to the movement toward lower fuel consumption caused by global environmental problems. However, in general, higher strength is accompanied by lowering of workability and formability, and a steel sheet satisfying both high strength and high formability is desired. One answer to this is TRIP (TRIP) that utilizes the martensitic transformation of retained austenite.
transformation Induced Plac
steel), and its applications are expanding in recent years. However, with this steel, 1000MP with excellent formability
Although it is possible to manufacture a high-strength steel sheet of class a, it is difficult to secure formability with even higher strength, for example, ultra-high strength steel of 1500 MPa.
【０００３】そこで、高強度、高成形性を両立する別の
形として最近注目を浴びているのがホットプレスであ
る。これは鋼板を８００℃以上の高温に加熱した状態で
成形することにより高強度鋼板の成形性の問題を無く
し、成型後の冷却により所望の材質を得るというもので
ある。しかし、大気中での加熱を伴うため、表面に酸化
物が生成してこれを後工程で除去する必要がある。これ
を改善したものが特開２０００−３８６４０号公報であ
り、０．１５〜０．５％の炭素を含有する鋼板にアルミ
めっきして加熱時の酸化抑制を図っている。Therefore, hot pressing has recently been attracting attention as another form that achieves both high strength and high formability. This is to eliminate the problem of formability of a high-strength steel sheet by forming the steel sheet in a state of being heated to a high temperature of 800 ° C. or higher, and obtain a desired material by cooling after forming. However, since it is accompanied by heating in the atmosphere, an oxide is generated on the surface and needs to be removed in a later step. Japanese Patent Laid-Open No. 2000-38640 has improved this problem by aluminizing a steel plate containing 0.15 to 0.5% carbon to suppress oxidation during heating.
【０００４】[0004]
【発明が解決しようとする課題】この発明は高強度の成
形部品を効率良く製造するのに有効であるが、アルミめ
っき層はクラックを生じやすく、また通常の腐食環境で
は地鉄よりも貴な電位を有し、クラックから地鉄の腐食
が起こりやすいという欠点を有している。厳しい成形を
した後には、クラック部からの短期間での腐食、あるい
は塗装後耐食性の低下という問題が生じる。Although the present invention is effective in efficiently manufacturing a high-strength molded part, the aluminum plating layer is prone to cracks and is more noble than base steel in a normal corrosive environment. It has an electric potential and has a drawback that corrosion of base metal easily occurs from cracks. After severe molding, there is a problem that corrosion from the cracked portion in a short period of time or corrosion resistance after coating is deteriorated.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、上記のよ
うな課題を克服するためにアルミめっき鋼板の加工後の
耐食性への影響因子を詳細に検討した結果、次の知見を
得た。めっき層中にＭｇとＳｉを複合添加することによ
り、クラック自体の発生が大きく抑制され、またクラッ
クが発生しても短期間でのクラックからの素地腐食は起
こり難く、更に塗装後耐食性も大きく向上していた。Ｍ
ｇ，Ｓｉを複合添加することにより、ホットプレスのた
めの加熱時にこれら元素を含有する金属間化合物層が生
成し、その加工性は通常のアルミめっきをベースとした
ものよりも向上していたものと推察される。Means for Solving the Problems The present inventors have obtained the following findings as a result of detailed investigation of factors affecting corrosion resistance of aluminum plated steel sheets after processing in order to overcome the above problems. . By adding Mg and Si together in the plating layer, the occurrence of cracks is greatly suppressed, and even if cracks occur, the base corrosion from the cracks does not occur in a short period of time, and the corrosion resistance after coating is also greatly improved. Was. M
By adding g and Si together, an intermetallic compound layer containing these elements was formed during heating for hot pressing, and its workability was improved over that of ordinary aluminum plating. It is presumed that.
【０００６】また、めっき層中にＭｇ2 Ｓｉが生成し、
これが腐食環境下でＭｇイオンを放出して地鉄、あるい
はめっき層表面に皮膜を形成してクラック部位からの素
地腐食を抑制する作用を持つ。更には、Ｍｇの沸点は１
０９０℃で９００℃以上の高温域で表面から一部飛散し
て、表面に微細な凹凸が生じて、その結果塗料の密着性
が向上して塗装後耐食性にも有利に働いたものと推定し
ている。更に、Ｚｎを複合添加することで、Ｚｎの鋼素
地の犠牲防食作用も発現し、更に安定した耐食性、塗装
後耐食性が得られる。Ｍｇを添加せず、Ｚｎ−Ｓｉを添
加した系でも、Ｍｇ−Ｓｉ添加系Ｍｇ−Ｓｉ−Ｚｎ添加
系ほどではないが、良好な耐食性、塗装後耐食性が得ら
れる。Further, Mg 2 Si is generated in the plating layer,
This has the action of releasing Mg ions in a corrosive environment to form a film on the surface of the base iron or the plating layer and suppress the base corrosion from the crack site. Furthermore, the boiling point of Mg is 1
It is presumed that in a high temperature range of 090 ° C or higher, 900 ° C or higher, a part of the particles scatter from the surface, resulting in fine irregularities on the surface, and as a result, the adhesion of the paint is improved and the corrosion resistance after coating is also favorably worked. ing. Furthermore, by adding Zn in combination, a sacrificial anticorrosive action of Zn on the steel base material is exhibited, and more stable corrosion resistance and corrosion resistance after coating are obtained. Even in a system in which Mg is not added and Zn-Si is added, good corrosion resistance and post-coating corrosion resistance can be obtained, though not to the same extent as the Mg-Si addition system Mg-Si-Zn addition system.
【０００７】[0007]
【発明の実施の形態】次に、本発明の限定理由について
説明する。まず、鋼成分の限定理由を以下に述べる。
Ｃ：本発明は成型後に１０００ＭＰａ以上の高強度を有
するものであり、ホットプレス後に急冷してマルテンサ
イトを主体とする組織に変態させるものであり、そのた
めにはＣ量０．１％が必要である。一方、Ｃ量を０．５
％以上に増大させても強度が飽和してしまうことに加
え、溶接割れを生じやすくするため、上限を０．５％に
定める。BEST MODE FOR CARRYING OUT THE INVENTION Next, the reasons for limitation of the present invention will be described. First, the reasons for limiting the steel components will be described below. C: The present invention has a high strength of 1000 MPa or more after molding, and is rapidly cooled after hot pressing to transform into a structure mainly composed of martensite. For that purpose, a C content of 0.1% is required. is there. On the other hand, the amount of C is 0.5
%, The strength is saturated, and in addition, the upper limit is set to 0.5% in order to easily cause weld cracking.
【０００８】Ｓｉ：Ｓｉは低すぎると疲労特性の低下を
惹起するため、０．０５％以上の添加が必要である。ま
た、ＳｉはめっきのＡｌとＦｅ間の反応を促進して鋼板
の耐熱性を向上させる効果を有する。しかし、Ｓｉは再
結晶焼鈍中に安定な酸化皮膜を鋼板表面に形成し、アル
ミめっき性を阻害する元素でもある。この意味からＳｉ
の上限を０．５％とする。Si: If Si is too low, it causes deterioration of fatigue characteristics, so 0.05% or more is required to be added. In addition, Si has the effect of promoting the reaction between Al and Fe of the plating to improve the heat resistance of the steel sheet. However, Si is also an element that forms a stable oxide film on the surface of the steel sheet during the recrystallization annealing and impairs the aluminum plating property. From this meaning Si
Is 0.5%.
【０００９】Ｍｎ：この元素は鋼板の焼入れ性を高める
元素としてよく知られている。また、不可避的に混入す
るＳに起因する熱間脆性を防ぐために必要な元素でもあ
る。この理由から０．５％以上の添加が必要である。ま
た、Ｍｎはアルミめっき後の耐熱性も向上させる。しか
し、３％を超えてＭｎを添加すると焼入れ後の衝撃特性
が低下するためここを上限とする。
Ｂ：この元素も鋼板の焼入れ性を向上させる元素として
よく知られている。本発明でもより焼入れ性を向上のた
め添加する。このとき焼入れ性の観点から下限を０．０
００３％に、また、過剰に添加すると鋼板の脆性を劣化
させるため、上限を０．０３％とする。Mn: This element is well known as an element that enhances the hardenability of steel sheets. It is also an element necessary for preventing hot brittleness due to S inevitably mixed. For this reason, it is necessary to add 0.5% or more. Mn also improves the heat resistance after aluminum plating. However, if Mn is added in excess of 3%, the impact properties after quenching deteriorate, so this is the upper limit. B: This element is also well known as an element that improves the hardenability of a steel sheet. Also in the present invention, it is added to improve the hardenability. At this time, the lower limit is 0.0 from the viewpoint of hardenability.
If added to 003% or excessively, the brittleness of the steel sheet deteriorates, so the upper limit is made 0.03%.
【００１０】Ｔｉ：Ｂは焼入れ性に効果が大きいが、鋼
中に存在するＮとＢＮを形成しやすい。これを防止して
Ｂの効果を十分発揮させるためにＴｉを添加する必要が
ある。このときＮはＴｉＮを形成する。この目的のた
め、０．０１％以上必要である。また、Ｔｉはアルミめ
っきの耐熱性への影響が最も大きい。本用途のような９
００℃を超すような高温域で使用するには、耐熱性とい
う意味から０．１％以上の添加が望ましい。その効果は
０．７％程度で飽和するため、ここを上限とする。Although Ti: B has a great effect on the hardenability, it easily forms N and BN existing in the steel. In order to prevent this and bring out the effect of B sufficiently, it is necessary to add Ti. At this time, N forms TiN. For this purpose, 0.01% or more is necessary. Further, Ti has the greatest effect on the heat resistance of aluminum plating. 9 like this application
For use in a high temperature range exceeding 00 ° C., it is desirable to add 0.1% or more from the viewpoint of heat resistance. Since the effect is saturated at about 0.7%, this is the upper limit.
【００１１】さらに、本発明ではＢ，Ｔｉに変えてＭ
ｏ，Ｃｒ，Ｎｉの１種または２種以上を添加することも
可能である。これらの元素はいずれも焼入れ性を向上さ
せる元素である。これらの元素は０．０２％以上の添加
で焼入れ性を向上せしめる。また、Ｍｏ，Ｎｉは高価な
元素であることから、Ｃｒは添加しすぎるとめっき性が
低下することからそれぞれ０．５％を上限に定める。Further, in the present invention, M is used in place of B and Ti.
It is also possible to add one or more of o, Cr and Ni. All of these elements are elements that improve hardenability. Addition of 0.02% or more of these elements improves the hardenability. Further, Mo and Ni are expensive elements, and if Cr is added too much, the plating property is deteriorated.
【００１２】次に、めっき層の限定理由を述べる。
Ｓｉ：Ｓｉはアルミ系めっきの合金層（めっき−鋼板界
面に生じる金属間化合物の層）厚みを低減するために有
効である。また、Ｍｇと複合添加することでＭｇ 2 Ｓｉ
を形成し、耐食性向上効果も有する。このためには１％
以上の添加が有効である。過剰の添加は融点上昇を伴
い、またＳｉ単相がめっき層に晶出すると耐食性を低下
させる。このため１５％を上限とする。Next, the reasons for limiting the plating layer will be described.
Si: Si is an aluminum-based plating alloy layer (plating-steel sheet boundary
Yes, to reduce the thickness of the intermetallic compound layer generated on the surface.
It is effective. In addition, by adding Mg together with Mg, 2Si
And also has the effect of improving corrosion resistance. 1% for this
The above additions are effective. Excessive addition will increase melting point
In addition, the corrosion resistance decreases when the Si single phase crystallizes in the plating layer.
Let Therefore, the upper limit is 15%.
【００１３】Ｍｇ：この元素は特に塩害環境下での耐食
性向上に有効であることが知られている。特に、Ｍｇ2
Ｓｉとすることで環境中への放出効率が高められ、耐食
性向上に奏功する。耐食性のために０．５％以上の添加
とする。過剰の添加はめっき浴面での激しい酸化を引起
こし、まためっき浴の融点も上昇させるため、１０％以
下とする。Ｍｇの浴面酸化を抑制するにはＣａの微量
（０．５％以下）の添加が有効で、この程度のＣａを添
加してもよい。Mg: This element is known to be particularly effective in improving the corrosion resistance under salt damage environment. In particular, Mg 2
By using Si, the efficiency of release into the environment is increased and it is effective in improving corrosion resistance. Add 0.5% or more for corrosion resistance. Excessive addition causes severe oxidation on the plating bath surface and also raises the melting point of the plating bath, so the content is made 10% or less. It is effective to add a trace amount of Ca (0.5% or less) in order to suppress the bath surface oxidation of Mg, and Ca in this amount may be added.
【００１４】Ｚｎ：ＺｎはＡｌあるいは鋼よりも卑な電
位を有し、地鉄の腐食を抑制する作用を有する。Ｚｎの
添加量は１％以上で効果を発揮し始め、Ｚｎ量が２０〜
６０％で最も良好な特性を示し、６０％超の添加量では
寧ろ耐食性を害する。従って、Ｚｎ量の下限を１％に、
上限を６０％に定める。本発明によるＡｌ系めっき鋼板
を使用して実際に部品を製造する際には、プレス後金型
で急速に冷却して焼入れを行うものであり、その組織と
してはマルテンサイトを主体とする組織を呈する。部材
として十分な強度を確保するために、マルテンサイト比
率が６０体積％以上であるものとする。なお、マルテン
サイトの存在比率は研磨、エッチング後に光学顕微鏡観
察を行い画像解析することで計算するものとする。Zn: Zn has a base potential lower than that of Al or steel and has an action of suppressing the corrosion of the base metal. When the added amount of Zn is 1% or more, the effect begins to be exhibited, and the Zn amount is 20 to
60% shows the best characteristics, and addition amount over 60% impairs corrosion resistance. Therefore, the lower limit of Zn content is set to 1%,
The upper limit is set to 60%. When a part is actually manufactured using the Al-plated steel sheet according to the present invention, it is rapidly cooled by a die after pressing and quenched, and the structure mainly composed of martensite is used. Present. In order to secure sufficient strength as a member, the martensite ratio is 60% by volume or more. Note that the abundance ratio of martensite is calculated by observing with an optical microscope and performing image analysis after polishing and etching.
【００１５】本発明において、Ａｌ系めっきの付着量、
めっき前処理，後処理等については特に限定するもので
はない。付着量は通常の片面３０〜８０ｇ／ｍ2 の範囲
ではなんら問題ない。めっき後処理として一次防錆、潤
滑性を目的としてクロメート処理、樹脂被覆処理等があ
りうるが、有機樹脂は加熱すると消失してしまうため好
ましくない。クロメート処理も近年の６価クロム規制を
考慮すると、電解クロメート等の３価の処理皮膜が好ま
しい。めっきへの添加元素として、上記した元素以外に
Ｍｎ，Ｃｒ，Ｔｉ，Ｓｎ，Ｓｂ，ミッシュメタル等あり
うるが、これらを添加することも可能である。めっき鋼
板の製造法についても何ら限定するものではない。通常
の製鋼、熱延条件が適用可能である。Ａｌ−Ｚｎめっき
は通常溶融めっき法で施されるが、これに限定せず、非
水溶媒からの電気めっき、蒸着処理等も使用可能であ
る。めっき前処理としてＮｉプレめっき等もありうる
が、これも適用可能である。In the present invention, the amount of Al-based plating adhered,
The plating pretreatment and posttreatment are not particularly limited. There is no problem if the amount of adhesion is within the usual range of 30 to 80 g / m 2 on one side. Although post-plating treatment may include primary rust prevention, chromate treatment for the purpose of lubricity, resin coating treatment, etc., it is not preferable because the organic resin disappears when heated. Considering the recent regulation of hexavalent chromium, the chromate treatment is preferably a trivalent treatment film such as electrolytic chromate. In addition to the above-mentioned elements, Mn, Cr, Ti, Sn, Sb, misch metal, and the like can be added as elements to the plating, but it is also possible to add these. There is no limitation on the method for producing the plated steel sheet. Normal steelmaking and hot rolling conditions can be applied. The Al-Zn plating is usually performed by a hot dipping method, but the present invention is not limited to this, and electroplating from a non-aqueous solvent, vapor deposition treatment, etc. can also be used. As the pretreatment for plating, Ni pre-plating or the like may be used, but this is also applicable.
【００１６】[0016]
【実施例】次に、実施例で本発明をより詳細に説明す
る。
（実施例１）通常の熱延、冷延工程を経た、表１に示す
ような鋼成分の酸洗鋼板（板厚１．８ｍｍ）、冷延鋼板
（板厚１．２ｍｍ）を材料として、溶融Ａｌ−Ｓｉ−Ｍ
ｇめっきを行った。表１の鋼種Ａ，Ｃ，Ｅ，Ｇは冷延鋼
板であり、残りは熱延鋼板である。溶融めっきは無酸化
炉−還元炉タイプのラインを使用し、めっき後ガスワイ
ピング法でめっき付着量を片面４０ｇ／ｍ2 に調節し、
その後冷却し、ゼロスパングル処理を施した。この際の
めっき浴組成としてはＡｌ−８％Ｓｉ−６％Ｍｇ−１％
Ｆｅ−０．１％Ｃａとした。浴中のＦｅは浴中のめっき
機器やストリップから供給される不可避のものである。
めっき外観はスパングル模様を呈し、不めっき等なく良
好であった。このときの製造条件を表２に示す。EXAMPLES Next, the present invention will be described in more detail by way of examples. (Example 1) As a material, a pickled steel sheet (sheet thickness 1.8 mm) and a cold rolled steel sheet (sheet thickness 1.2 mm) having steel components as shown in Table 1 which have undergone ordinary hot rolling and cold rolling steps are used. Molten Al-Si-M
g plating was performed. Steel types A, C, E, and G in Table 1 are cold-rolled steel sheets, and the rest are hot-rolled steel sheets. Hot-dip galvanizing uses a non-oxidizing furnace-reducing furnace type line, and after plating, adjust the coating amount by gas wiping method to 40 g / m 2 on one side,
After that, it was cooled and subjected to zero spangle treatment. The composition of the plating bath at this time is Al-8% Si-6% Mg-1%
Fe-0.1% Ca was used. Fe in the bath is unavoidable supplied from plating equipment and strips in the bath.
The plating appearance showed a spangle pattern and was good with no plating. Table 2 shows the manufacturing conditions at this time.
【００１７】このようにして製造した溶融めっき鋼板の
焼入れ性、耐食性を評価した。評価方法を以下に記す。
溶融めっき鋼板に５％の引張り加工を付与し、その後９
５０℃に５分間加熱した後、鋼板間に挟んで冷却した。
冷却速度は約３０℃／秒であった。冷却後の目視外観よ
り耐熱性を評価した。次に、この鋼板の裸耐食性を湿気
槽試験（相対湿度９５％、温度４０℃）３日で、また塗
装後耐食性をクロスカットを施した後、塩水噴霧試験
（ＪＩＳ−Ｚ２１３４）３０日で評価した。このときの
塗装はカチオン系電着塗装であり、膜厚は１５μｍとし
た。また鋼板のビッカース硬度を荷重１００ｇで測定し
た。The hot-dip galvanized steel sheet thus produced was evaluated for hardenability and corrosion resistance. The evaluation method is described below.
5% tensile processing is applied to the hot dip plated steel sheet, and then 9
After heating at 50 ° C. for 5 minutes, it was sandwiched between steel plates and cooled.
The cooling rate was about 30 ° C./sec. The heat resistance was evaluated from the visual appearance after cooling. Next, the bare corrosion resistance of this steel plate was evaluated in a humidity tank test (relative humidity 95%, temperature 40 ° C.) for 3 days, and after the corrosion resistance after coating was cross-cut, a salt spray test (JIS-Z2134) was evaluated for 30 days. did. The coating at this time was cationic electrodeposition coating, and the film thickness was 15 μm. The Vickers hardness of the steel sheet was measured with a load of 100 g.
【００１８】〔耐熱性の評価基準〕 ○：良好 △：表面にクラック状の模様発生 ×：赤スケール発生 〔裸耐食性の評価基準〕 ○：良好 ×：赤錆発生 〔塗装後耐食性の評価基準〕 ◎：塗装膨れ１ｍｍ以内 ○：塗装膨れ２ｍｍ以内 △：塗装膨れ２〜４ｍｍ ×：塗装膨れ４ｍｍ超[Heat Resistance Evaluation Criteria] ○: Good Δ: Crack-like pattern is generated on the surface ×: Red scale occurred [Evaluation criteria for bare corrosion resistance] ○: Good ×: Red rust occurred [Evaluation criteria for corrosion resistance after painting] ◎: Paint swelling within 1 mm ○: Paint swelling within 2 mm Δ: Paint swelling 2 to 4 mm ×: Paint swelling over 4 mm
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【表２】 [Table 2]
【００２１】Ｎｏ．７のようにＣが低すぎると十分な強
度が得られない。ビッカース硬度は一般に３倍するとそ
の材料の強度（ＭＰａ）に近い値となるが、この場合、
８００ＭＰａクラスの強度しか得られない。また、Ｎ
ｏ．８のようにＭｎ，Ｂ等の焼入れ元素が低いとＣが高
くても焼入れ効果が得られない。鋼中元素の添加量が適
正に制御された、Ｎｏ．１〜６については、Ｍｎ−Ｂ
系，Ｍｏ−Ｃｒ−Ｎｉ系いずれも強度，耐食性の双方と
も良好な結果が得られた。No. If C is too low as in No. 7, sufficient strength cannot be obtained. Generally, the Vickers hardness becomes a value close to the strength (MPa) of the material when it is tripled, but in this case,
Only strength of 800 MPa class can be obtained. Also, N
o. If the quenching elements such as Mn and B are low as in No. 8, the quenching effect cannot be obtained even if C is high. No. 3, in which the addition amount of the element in the steel was properly controlled. For 1 to 6, Mn-B
Good results were obtained in both strength and corrosion resistance in both the Mo-Cr-Ni system and the Mo-Cr-Ni system.
【００２２】（実施例２）表１のＡの鋼を使用して、溶
融めっきラインのめっき組成を変化させてめっき組成と
特性の関係を調査した。めっき後のめっき層組成と特性
の関係を表３にまとめる。なお、ビッカース硬度はいず
れも４７０〜５１０の間であった。Ｎｏ．１の全くＺｎ
を含有しない系では、裸で短期で赤錆が発生しやすく、
また塗装後でも膨れが発生しやすい。一方、Ｚｎ量が多
すぎるＮｏ．７においても塗装後耐食性に低下が認めら
れる。Ｚｎ量を適正にすることで、優れた加工後耐食性
が得られる。Example 2 Using the steel of A in Table 1, the composition of the hot-dip galvanizing line was changed and the relationship between the composition and the characteristics was investigated. Table 3 shows the relationship between the plating layer composition after plating and the characteristics. The Vickers hardness was in the range of 470 to 510. No. 1 totally Zn
In a system that does not contain, red rust is likely to occur in a short period of time,
In addition, swelling is likely to occur even after painting. On the other hand, when the Zn content is too large, No. In No. 7 as well, a decrease in corrosion resistance after coating is recognized. By adjusting the amount of Zn appropriately, excellent corrosion resistance after processing can be obtained.
【００２３】[0023]
【表３】 [Table 3]
【００２４】（実施例３）表１のＥの鋼を使用して、溶
融めっきラインのめっき組成を変化させてめっき組成と
特性の関係を調査した。めっき後のめっき層組成と特性
の関係を表４にまとめる。なお、ビッカース硬度はいず
れも４７０〜５１０の間であった。Ｎｏ．８のＳｉのみ
添加、Ｎｏ．９のＭｇ−Ｚｎ添加系ではいずれも耐食性
に劣る。一方、Ｓｉ−Ｍｇ添加系のＮｏ．４〜７は優れ
た耐食性を示した。Ｓｉ−Ｍｇ−Ｚｎ添加系のＮｏ．１
〜３においても、同様に耐食性に優れている。(Example 3) Using the steel E of Table 1, the relationship between the plating composition and the characteristics was investigated by changing the plating composition of the hot dip coating line. Table 4 summarizes the relationship between the plating layer composition after plating and the characteristics. The Vickers hardness was in the range of 470 to 510. No. No. 8 added Si only. All of the 9-Mg-Zn-added systems are inferior in corrosion resistance. On the other hand, Si-Mg addition system No. Nos. 4 to 7 showed excellent corrosion resistance. Si-Mg-Zn addition system No. 1
Similarly, in Nos. 3 to 3, the corrosion resistance is excellent.
【００２５】[0025]
【表４】 [Table 4]
【００２６】[0026]
【発明の効果】以上述べたように、本発明は、耐食性、
特に加工後の耐食性に優れたホットプレス用Ａｌ−Ｚｎ
系めっき鋼板を提供する。本発明は、今後の自動車軽量
化に大きく寄与するものと思われ、産業上の寄与は大き
い。As described above, the present invention provides corrosion resistance,
Especially Al-Zn for hot press with excellent corrosion resistance after processing
Provide a system-plated steel sheet. The present invention is expected to make a great contribution to the weight reduction of automobiles in the future, and makes a great contribution to industry.
【図面の簡単な説明】[Brief description of drawings]
【図１】めっき層のＺｎ量と塗装後のクロスカットから
の塗装膨れの関係を示す図である。FIG. 1 is a diagram showing a relationship between a Zn amount in a plating layer and a coating swelling after a cross cut after coating.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 末廣 正芳 福岡県北九州市戸畑区飛幡町１番１号 新 日本製鐵株式会社八幡製鐵所内 (72)発明者 宮腰 寿拓 福岡県北九州市戸畑区飛幡町１番１号 新 日本製鐵株式会社八幡製鐵所内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Masayoshi Suehiro No. 1-1 Tobatacho, Tobata-ku, Kitakyushu City, Fukuoka Prefecture New Nippon Steel Co., Ltd., Yawata Works (72) Inventor, Hisashi Miyakoshi No. 1-1 Tobatacho, Tobata-ku, Kitakyushu City, Fukuoka Prefecture New Nippon Steel Co., Ltd., Yawata Works
Claims (5)
Ｓｉ：１〜１５％、Ｍｇ：０．５〜１０％を含有するＡ
ｌ系金属被覆を有することを特徴とする、耐熱性、耐食
性に優れたホットプレス用アルミ系めっき鋼板。1. In mass%, C: 0.1-0.5%, Si: 0.05-0.5%, Mn: 0.5-3%, B: 0.0003-0.03% , Ti: Mainly Al on the surface of steel having a steel component containing 0.01 to 0.7%,
A containing Si: 1 to 15% and Mg: 0.5 to 10%
An aluminum-based plated steel sheet for hot pressing having excellent heat resistance and corrosion resistance, which is characterized by having an l-based metal coating.
面にＡｌを主体とし、Ｓｉ：１〜１５％、Ｍｇ：０．５
〜１０％を含有するＡｌ系金属被覆を有することを特徴
とする、耐熱性、耐食性に優れたホットプレス用アルミ
系めっき鋼板。2. In mass%, C: 0.1-0.5%, Si: 0.05-0.5%, Mn: 0.5-3% are contained, and Mo: 0.02-. 0.5%, Cr: 0.02 to 0.5%, Ni: 0.02 to 0.5% Steel having a steel component containing one or more of Al is mainly contained on the surface of Si, : 1 to 15%, Mg: 0.5
An aluminum-based plated steel sheet for hot pressing having excellent heat resistance and corrosion resistance, which has an Al-based metal coating containing 10% to 10%.
有することを特徴とする、請求項１または２に記載の耐
熱性、耐食性に優れたホットプレス用アルミ系めっき鋼
板。3. The aluminum-based plated steel sheet for hot press having excellent heat resistance and corrosion resistance according to claim 1 or 2, wherein the plating layer further contains Zn: 1 to 60%.
し、Ｚｎ：１〜６０％、Ｓｉ／Ａｌ：０．０１〜０．３
となるような組成を有し、鋼組成が請求項１または２に
記載の成分からなることを特徴とする、耐熱性、耐食性
に優れたホットプレス用アルミ系めっき鋼板。4. The plating layer composition is mass% and is mainly composed of Al, Zn: 1 to 60%, Si / Al: 0.01 to 0.3.
An aluminum-based plated steel sheet for hot press having excellent heat resistance and corrosion resistance, characterized in that the steel composition is composed of the components according to claim 1 or 2.
ト組織を有し、請求項１〜３に記載の鋼成分を有するこ
とを特徴とする耐熱性、耐食性に優れたアルミ系めっき
鋼板を使用した自動車用部材。5. An aluminum-based plated steel sheet having excellent heat resistance and corrosion resistance, characterized in that the steel structure has a martensite structure of 60% or more in volume and has the steel composition according to claims 1 to 3. Parts for automobiles.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001190707A JP4023710B2 (en) | 2001-06-25 | 2001-06-25 | Aluminum-plated steel sheet for hot press with excellent corrosion resistance and heat resistance, and automotive parts using the same |
| TW091113018A TWI317383B (en) | 2001-06-15 | 2002-06-14 | High-strength alloyed aluminum-system plated steel sheet and high-strength automotive part excellent in heat resistance and after-painting corrosion resistance |
| AU2002309283A AU2002309283B2 (en) | 2001-06-15 | 2002-06-14 | High-strength Alloyed Aluminum-system Plated Steel Sheet and High-strength Automotive Part Excellent in Heat Resistance and After-painting Corrosion Resistance |
| CNB028120361A CN100370054C (en) | 2001-06-15 | 2002-06-14 | High-strength alloyed aluminum-system plated steel sheet and high-strength automotive part excellent in heat resistance and after-painting corrosion resistance |
| KR1020037016351A KR100836282B1 (en) | 2001-06-15 | 2002-06-14 | High-strength alloyed aluminum-system palted steel sheet |
| KR1020077027723A KR20070119096A (en) | 2001-06-15 | 2002-06-14 | High-strength alloyed aluminum-system palted steel sheet |
| KR1020087029007A KR20080108163A (en) | 2001-06-15 | 2002-06-14 | Hot press method of high-strength alloyed aluminum-system palted steel sheet |
| KR1020077017549A KR20070087240A (en) | 2001-06-15 | 2002-06-14 | Hot press method of high-strength alloyed aluminum-system palted steel sheet |
| PCT/JP2002/005978 WO2002103073A2 (en) | 2001-06-15 | 2002-06-14 | High-strength alloyed aluminum-system plated steel sheet and high-strength automotive part excellent in heat resistance and after-painting corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001190707A JP4023710B2 (en) | 2001-06-25 | 2001-06-25 | Aluminum-plated steel sheet for hot press with excellent corrosion resistance and heat resistance, and automotive parts using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003034845A true JP2003034845A (en) | 2003-02-07 |
| JP4023710B2 JP4023710B2 (en) | 2007-12-19 |
Family
ID=19029442
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001190707A Expired - Fee Related JP4023710B2 (en) | 2001-06-15 | 2001-06-25 | Aluminum-plated steel sheet for hot press with excellent corrosion resistance and heat resistance, and automotive parts using the same |
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| Country | Link |
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| JP2007302982A (en) * | 2006-05-15 | 2007-11-22 | Nippon Steel Corp | Al-PLATED STEEL MATERIAL TO BE HOT-PRESSED WHICH IS EASILY HEATED, HAS SUPERIOR WORKABILITY AND HAS SUPERIOR CORROSION RESISTANCE AFTER HAVING BEEN COATED |
| KR100810319B1 (en) * | 2004-11-19 | 2008-03-04 | 가부시키가이샤 고베 세이코쇼 | Steel material having a high errosion resistant property |
| WO2014181653A1 (en) | 2013-05-07 | 2014-11-13 | 新日鐵住金株式会社 | Aluminum-based alloy plated steel material having excellent post-coating corrosion resistance |
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|---|---|---|---|---|
| KR100810319B1 (en) * | 2004-11-19 | 2008-03-04 | 가부시키가이샤 고베 세이코쇼 | Steel material having a high errosion resistant property |
| JP2007302982A (en) * | 2006-05-15 | 2007-11-22 | Nippon Steel Corp | Al-PLATED STEEL MATERIAL TO BE HOT-PRESSED WHICH IS EASILY HEATED, HAS SUPERIOR WORKABILITY AND HAS SUPERIOR CORROSION RESISTANCE AFTER HAVING BEEN COATED |
| WO2014181653A1 (en) | 2013-05-07 | 2014-11-13 | 新日鐵住金株式会社 | Aluminum-based alloy plated steel material having excellent post-coating corrosion resistance |
| US10174413B2 (en) | 2013-05-07 | 2019-01-08 | Nippon Steel & Sumitomo Metal Corporation | Al-based alloy plated steel material having excellent post-coating corrosion resistance |
| KR20150075435A (en) * | 2013-12-25 | 2015-07-06 | 주식회사 포스코 | Steel sheet for hot press forming having high microcracking resistance and corrosion property and hot press formed article using the same and method for manufacturing the same |
| KR101568549B1 (en) * | 2013-12-25 | 2015-11-11 | 주식회사 포스코 | Steel sheet for hot press formed product having high bendability and ultra high strength, hot press formed product using the same and method for manufacturing the same |
| KR101585736B1 (en) * | 2013-12-25 | 2016-01-15 | 주식회사 포스코 | Steel sheet for hot press forming having high microcracking resistance and corrosion property and hot press formed article using the same and method for manufacturing the same |
| JP2017508069A (en) * | 2013-12-25 | 2017-03-23 | ポスコＰｏｓｃｏ | Steel sheet for hot press-formed product having excellent bendability and ultra-high strength, hot press-formed product using the same, and manufacturing method thereof |
| WO2015099382A1 (en) * | 2013-12-25 | 2015-07-02 | 주식회사 포스코 | Steel sheet for hot press formed product having superior bendability and ultra-high strength, hot press formed product using same, and method for manufacturing same |
| US10253388B2 (en) | 2013-12-25 | 2019-04-09 | Posco | Steel sheet for hot press formed product having superior bendability and ultra-high strength, hot press formed product using same, and method for manufacturing same |
| US10590522B2 (en) | 2015-12-23 | 2020-03-17 | Posco | Aluminum-iron alloy-coated steel sheet for hot press forming, having excellent hydrogen delayed fracture resistance, peeling resistance, and weldability and hot-formed member using same |
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