JP2005015907A - Molten al-based galvanized steel sheet having excellent high-temperature strength and oxidation resistance - Google Patents
Molten al-based galvanized steel sheet having excellent high-temperature strength and oxidation resistance Download PDFInfo
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本発明は、自動車の排気系部材、建材、各種熱器具等に使用する際に、高温においても強度の低下が少なく、高温での耐酸化性にも優れた鋼板に関する。このような特性を有する鋼板としてステンレス系の鋼板があるが、本発明によるＡｌ系めっき鋼板はステンレス系の材料よりも低廉で同等の特性を有することに特徴がある。 TECHNICAL FIELD The present invention relates to a steel sheet that is less susceptible to strength reduction at high temperatures and excellent in oxidation resistance at high temperatures when used in automobile exhaust system members, building materials, various heat appliances, and the like. There is a stainless steel sheet as a steel sheet having such characteristics, but the Al-based plated steel sheet according to the present invention is characterized by being cheaper and having the same characteristics as a stainless steel material.
溶融Ａｌ系のめっき鋼板はめっき層の耐熱性、耐食性が溶融Ｚｎ系のめっき鋼板よりも優れることから、自動車排気系部材、燃料タンク、建材、各種熱器具等に使用されている。溶融Ａｌめっき鋼板にはＳｉを添加したタイプと添加しないタイプがあり、一般にそれぞれＴｙｐｅ１、Ｔｙｐｅ２と呼ばれている。Ｓｉを添加したＡｌめっき鋼板は特に耐熱性（耐酸化性）が優れることが知られ、耐熱用途へ使用されている。一方で鋼成分も耐熱性（耐酸化性）、あるいは高温強度に影響することが知られ、例えば特開昭６０−１３０５９号公報（特許文献１）、特開２００１−８１５３２号公報（特許文献２）において耐熱性と高温強度に優れたＡｌめっき鋼板が開示されている。 Since the molten Al-based plated steel sheet is superior in heat resistance and corrosion resistance of the plated layer to the molten Zn-based plated steel sheet, it is used for automobile exhaust system members, fuel tanks, building materials, various heat appliances, and the like. There are two types of hot-dip Al-plated steel sheets with and without Si added, and they are generally referred to as Type 1 and Type 2, respectively. Al-plated steel sheets to which Si is added are known to be particularly excellent in heat resistance (oxidation resistance), and are used for heat resistance applications. On the other hand, it is known that steel components also affect heat resistance (oxidation resistance) or high-temperature strength. For example, JP-A-60-13059 (Patent Document 1), JP-A-2001-81532 (Patent Document 2). ) Discloses an Al-plated steel sheet excellent in heat resistance and high-temperature strength.
これらは確かに常温での加工性と高温での強度のバランスを高めたものであるが、本発明者らがこれらの系で再試験をしたところ、耐酸化性のバラツキが大きいという事実を見出した。これはＡｌめっき時の欠陥に起因してその箇所が異常酸化を起こしていると推定された。特許文献１の成分系は鋼中のＣｒ，Ｓｉが高く、これらの元素は溶融Ａｌめっき時に不めっきを起こしやすいことが知られている。また、特許文献２の成分系はＭｎとＮｂの含有量が高く、このような場合にはやはり不めっきが発生しやすい傾向が認められた。その詳細な原因は不明であるが、これらの元素の複合酸化物が鋼板表面に濃化してＡｌめっき時に何らかの悪影響を及ぼしているものと推定される。 These have certainly improved the balance between workability at normal temperature and strength at high temperature, but when the inventors re-tested these systems, they found the fact that there was a large variation in oxidation resistance. It was. This was estimated to be caused by abnormal oxidation due to defects during Al plating. The component system of Patent Document 1 is high in Cr and Si in steel, and these elements are known to easily cause non-plating during hot-dip Al plating. Further, the component system of Patent Document 2 has a high content of Mn and Nb. In such a case, a tendency that non-plating is likely to occur is recognized. Although the detailed cause is unknown, it is estimated that the complex oxide of these elements has concentrated on the steel plate surface and has some bad influence at the time of Al plating.
本発明は上記の課題を解決するためにさなれ、常温での加工性、高温での強度に加えて安定した耐酸化性を有する溶融Ａｌめっき鋼板を提供するものである。高温強度の向上に対してＮｂは大きな影響を持つが、Ｍｎと共存すると前述したように表面めっき欠陥の懸念があるため、鋼成分の最適化を図ったものである。 上記目的を達成するために、第１の発明は、質量％で、Ｃ：０．００１〜０．２５％、Ｓｉ：０．００１〜０．０２５％、Ｍｎ：０．４２〜０．９５％、Ｐ：０．００３〜０．０２５％、Ｎｂ：０．０１〜０．５％を含有し、残部および不可避的不純物からなる鋼の表面にＡｌを主体とする金属被覆を有することを特徴とする高温強度、耐酸化性に優れたＡｌ系めっき鋼板である。 In order to solve the above problems, the present invention provides a hot-dip Al-plated steel sheet having stable oxidation resistance in addition to workability at normal temperature and strength at high temperature. Although Nb has a great influence on the improvement of the high-temperature strength, there is a concern about surface plating defects when it coexists with Mn, so that the steel components are optimized. In order to achieve the above object, the first invention is, in mass%, C: 0.001 to 0.25%, Si: 0.001 to 0.025%, Mn: 0.42 to 0.95% , P: 0.003 to 0.025%, Nb: 0.01 to 0.5%, characterized by having a metal coating mainly composed of Al on the surface of the steel composed of the balance and inevitable impurities. It is an Al-based plated steel sheet with excellent high-temperature strength and oxidation resistance.
第２の発明は、第１の発明に記載した鋼板の化学組成において、更に、Ｔｉ：０．０１〜０．５％、Ｍｏ：０．０１〜０．０４％を含む点を規定したものである。
第３の発明は第１または２の発明において、更に、Ｎｉ：０．０１〜０．１％、Ｃｕ：０．０１〜０．１％、Ｂ：０．０００３〜０．００１％の１種または２種以上を含有する点を規定したものである。
第４の発明は、第１〜３の発明において、溶融Ａｌ系めっきが、Ｓｉ：１〜１５質量％を含有するＡｌ−Ｓｉ合金めっきである点を規定したものである。
2nd invention prescribed | regulated the point which contains Ti: 0.01-0.5% and Mo: 0.01-0.04% further in the chemical composition of the steel plate described in 1st invention. is there.
The third invention is the first or second invention, and further includes one of Ni: 0.01 to 0.1%, Cu: 0.01 to 0.1%, and B: 0.0003 to 0.001%. Or the point which contains 2 or more types is prescribed | regulated.
4th invention prescribes | regulates the point whose molten Al type plating is Al: Si alloy plating containing 1-15 mass% of Si in 1st-3rd invention.
第５の発明は、第１〜３の発明において、溶融Ａｌ系めっきが、Ｚｎ：１〜５０％、Ｓｉ：０．５〜１０％を含有するＡｌ−Ｚｎ−Ｓｉ合金めっきである点を規定したものである。
第６の発明は、第１〜５の発明において、溶融Ａｌ系めっきが、更に、Ｍｇ：０．１〜１０％、Ｃａ：０．００１〜５％、Ｓｒ：０．００５〜２％。Ｍｎ：０．０１〜２％、Ｃｒ：０．０１〜２％、Ｍｏ：０．０１〜２％、Ｓｎ：０．１〜１０％の１種または２種以上を含有することを規定したものである。
5th invention prescribes | regulates that the hot-dip Al type plating is Al: Zn-Si alloy plating containing Zn: 1-50% and Si: 0.5-10% in 1st-3rd invention. It is a thing.
6th invention WHEREIN: Molten Al system plating is further Mg: 0.1-10%, Ca: 0.001-5%, Sr: 0.005-2% in 1st-5th invention. Mn: 0.01 to 2%, Cr: 0.01 to 2%, Mo: 0.01 to 2%, Sn: 0.1 to 10%, specified to contain one or more It is.
本発明は、従来よりも優れた高温強度と耐酸化性を有するＡｌ系めっき鋼板を提供するものであり、より低廉な製品の品質を安定して向上させたものである。これによりＡｌ系めっき鋼板の適用部位が広がることになり、産業上の寄与は大きい。 The present invention provides an Al-based plated steel sheet having high-temperature strength and oxidation resistance superior to those of the prior art, and stably improves the quality of inexpensive products. Thereby, the application site | part of an Al type plated steel plate spreads, and the industrial contribution is large.
以下、本発明について詳細に説明する。
溶融Ａｌ系めっき鋼板の鋼成分がＡｌめっき後の特性に及ぼす影響として、以下のことが言える。まず高温強度に関しては、Ｎｂ，Ｍｎ，Ｂ，Ｍｏが高温強度に効果がある。また、Ａｌめっきの耐酸化性に関しては、Ｔｉ添加の効果がある。また、Ｃｒ，Ｓｉ，Ａｌ等の元素はそれ自体Ａｌめっき鋼板の耐酸化性に効果を及ぼすが、その一方で焼鈍炉の中で表面に濃化してＡｌめっき時の表面欠陥を増大させる。この表面欠陥は結果として耐酸化性の低下をもたらすために、これらの元素は耐酸化性に対してバラツキの大きな結果を与える。
Hereinafter, the present invention will be described in detail.
The following can be said as the influence of the steel component of the hot-dip Al-based plated steel sheet on the properties after Al plating. First, regarding high temperature strength, Nb, Mn, B, and Mo are effective in high temperature strength. Moreover, regarding the oxidation resistance of Al plating, there is an effect of adding Ti. In addition, elements such as Cr, Si, and Al themselves have an effect on the oxidation resistance of the Al-plated steel sheet, but on the other hand, they are concentrated on the surface in an annealing furnace to increase surface defects during Al plating. Since this surface defect results in a reduction in oxidation resistance, these elements give great results to the oxidation resistance.
本発明の知見によれば、更にＮｂとＭｎ、あるいはＮｂとＭｏが共存するときにも同様の効果が認められ、これらの元素はいずれも高温強度には寄与するが、耐酸化性という意味では必ずしも良い影響を及ぼさない。本発明においては、Ｓｉ，Ｃｒ，Ａｌ等の元素はできるだけ低減することが望ましく、また、Ｎｂ，Ｍｎ，Ｍｏの量を最適化したところに特徴がある。また、Ｔｉ，Ｎｉ，Ｃｕ等の元素は表面欠陥を防止する効果があり、その結果として耐酸化性の向上に寄与する。以下、各鋼成分の限定理由について詳述する。 According to the knowledge of the present invention, when Nb and Mn or Nb and Mo coexist, the same effect is recognized, and these elements all contribute to high temperature strength, but in the sense of oxidation resistance. Does not necessarily have a positive effect. In the present invention, it is desirable to reduce elements such as Si, Cr, and Al as much as possible, and the feature is that the amounts of Nb, Mn, and Mo are optimized. In addition, elements such as Ti, Ni, and Cu have an effect of preventing surface defects, and as a result, contribute to improvement in oxidation resistance. Hereinafter, the reason for limitation of each steel component is explained in full detail.
本発明において、鋼板中のＣは上限を０．２５％とする。これ以上添加すると鋼板の靱性、延性の低下が著しいためである。下限は製鋼工程における負荷から決定される。しかし、常温での加工性を考慮すると、望ましくは０．０５％以下であり、更に望ましくは０．０２％以下である。
鋼中のＳｉは、前述したようにＡｌめっき時の表面欠陥を増大させて結果として耐酸化性を低下させる要因となる。この影響はＭｎとの共存でより助長され、この意味から０．０２５％以下とする。下限は製鋼工程での負荷に依存する。
In the present invention, the upper limit of C in the steel sheet is 0.25%. This is because if the amount is more than this, the toughness and ductility of the steel sheet are significantly reduced. The lower limit is determined from the load in the steel making process. However, considering the workability at room temperature, it is preferably 0.05% or less, and more preferably 0.02% or less.
As described above, Si in steel increases surface defects during Al plating, and as a result, decreases oxidation resistance. This effect is further promoted by coexistence with Mn, and in this sense, it is made 0.025% or less. The lower limit depends on the load in the steelmaking process.
鋼中Ｍｎは、０．４２〜０．９５％の範囲となるように添加する必要がある。Ｍｎは高温強度に効果があり、Ｎｂとの共存を前提として０．４２％以上の添加が必要であるが、０．９５％を超えると耐酸化性のバラツキが大きくなる。
鋼中Ｐは、鋼板の冷間、熱間加工性を害する元素であるため、必要以上の添加は望ましくなく、本発明においても０．０２５％以下に限定する。下限を限定したのは製鋼工程の負荷が過大になるためである。
It is necessary to add Mn in steel so that it may become the range of 0.42-0.95%. Mn is effective in high-temperature strength and needs to be added in an amount of 0.42% or more on the premise of coexistence with Nb. However, if it exceeds 0.95%, the variation in oxidation resistance increases.
P in the steel is an element that impairs the cold and hot workability of the steel sheet, so addition beyond necessity is not desirable, and in the present invention, it is limited to 0.025% or less. The reason why the lower limit is limited is that the load of the steelmaking process becomes excessive.
鋼中Ｎｂは高温強度への影響が大きく、０．０１％以上添加が必要である。より望ましくは０．０８％以上で安定した高温強度が得られる。一方、Ｍｎとの共存によりＡｌめっき時の表面欠陥に影響するため、必要以上に添加することは望ましくなく、上限を０．５％とする。
鋼中Ｍｏも、Ｎｂ同様に高温強度への影響が大きい。この意味で添加することが好ましいが、ＭｏもＮｂと同様に共存する時にＡｌめっきへの表面欠陥を増大させることが判明した。従って、添加する場合には、０．０１％以上、０．０４％以下に制限する必要がある。
Nb in steel has a large effect on high-temperature strength, and it is necessary to add 0.01% or more. More desirably, a stable high temperature strength can be obtained at 0.08% or more. On the other hand, since coexistence with Mn affects surface defects during Al plating, it is not desirable to add more than necessary, and the upper limit is set to 0.5%.
Similarly to Nb, Mo in steel has a great influence on high temperature strength. It is preferable to add in this sense, but it has been found that Mo also increases surface defects to the Al plating when coexisting in the same manner as Nb. Therefore, when adding, it is necessary to restrict | limit to 0.01% or more and 0.04% or less.
鋼中Ｔｉは、前述したようにＡｌめっきの表面欠陥を抑制する効果、あるいは表面欠陥があったときの耐酸化性劣化を抑制する効果があり、０．０１％以上添加することが好ましい。その効果が飽和することから上限を０．５％とするのが望ましい。
鋼中Ｎｉ，Ｃｕも、Ｔｉ同様にＡｌめっき時の表面欠陥防止効果が認められた。このため、０．０１％以上添加することが好ましい。しかし、必要以上に添加すると鋼板の加工性を低下させ、また、比較的高価な元素でもあることから上限を０．１％とするのが望ましい。
Ti in steel has an effect of suppressing surface defects of Al plating as described above, or an effect of suppressing deterioration of oxidation resistance when there are surface defects, and is preferably added in an amount of 0.01% or more. Since the effect is saturated, the upper limit is preferably set to 0.5%.
Ni and Cu in the steel were also found to have the effect of preventing surface defects during Al plating similarly to Ti. For this reason, it is preferable to add 0.01% or more. However, if it is added more than necessary, the workability of the steel sheet is lowered, and since it is a relatively expensive element, the upper limit is preferably made 0.1%.
Ｂも、Ｎｂ，Ｍｏと同様に高温強度に寄与する。この意味から添加する場合には０．０００３％以上とするが、必要以上に添加すると鋼板の加工性を低下させるために上限を０．００１％とするのが望ましい。
上記した以外の元素については特に限定しないが、通常の鋼板に含有されうる元素としてＡｌ，Ｓ，Ｎ等がある。これらは通常Ａｌ：０．０１〜０．１％、Ｓ：０．０１％以下、Ｎ：０．００１％以下程度の範囲で含有されることが多い。
B also contributes to the high-temperature strength like Nb and Mo. When added in this sense, the content is made 0.0003% or more, but if added more than necessary, the upper limit is preferably made 0.001% in order to reduce the workability of the steel sheet.
Elements other than those described above are not particularly limited, but there are Al, S, N, and the like as elements that can be contained in a normal steel sheet. These are usually contained in a range of usually Al: 0.01 to 0.1%, S: 0.01% or less, and N: 0.001% or less.
次に、Ａｌ系被覆層の限定理由について詳述する。溶融Ａｌ系めっきとしては、純Ａｌめっきを適用することもできるが、耐酸化性を要求される用途であることを考慮するとＳｉ：１〜１５％を含有するＡｌ−Ｓｉ合金めっきとすることがより好ましい。このとき耐酸化性を得るためにはＳｉが１％以上必要で、一方、過剰なＳｉの添加は浴温の上昇や粗大なＳｉ初晶の晶出につながり、耐食性やめっきの加工性が低下することから上限値を１５％とする。 Next, the reason for limiting the Al-based coating layer will be described in detail. Although pure Al plating can be applied as the molten Al-based plating, considering that it is an application that requires oxidation resistance, an Al-Si alloy plating containing Si: 1 to 15% may be used. More preferred. At this time, in order to obtain oxidation resistance, 1% or more of Si is necessary. On the other hand, excessive addition of Si leads to an increase in bath temperature and crystallization of coarse Si primary crystals, resulting in decreased corrosion resistance and plating workability. Therefore, the upper limit is set to 15%.
溶融Ａｌ系めっきにおいて、Ａｌ−Ｚｎ合金めっきが主として建材用途で使用が広がりつつある。Ａｌ−Ｚｎ合金めっき系においても本発明は有効である。このときＺｎ量は１〜５０％とする。Ｚｎを添加するときにはＺｎによる犠牲防食機能が発揮されることが望ましいが、Ｚｎ１％以下ではその効果は認められない。また、Ｚｎを５０％超含有すると、Ｚｎの酸化により鋼板自体の耐酸化性が大きく低下する。Ｓｉは、耐酸化性に寄与し、０．５％以上が必要で、一方過剰な添加は耐食性、めっきの加工性から望ましくなく、０．５〜１０％に限定する。 In hot-dip Al-based plating, Al—Zn alloy plating is being used mainly for building materials. The present invention is also effective in an Al—Zn alloy plating system. At this time, the Zn content is 1 to 50%. When Zn is added, it is desirable that the sacrificial anticorrosion function by Zn is exhibited, but the effect is not recognized when Zn is 1% or less. If Zn is contained in excess of 50%, the oxidation resistance of the steel sheet itself is greatly reduced due to the oxidation of Zn. Si contributes to oxidation resistance, and 0.5% or more is necessary. On the other hand, excessive addition is undesirable from corrosion resistance and plating workability, and is limited to 0.5 to 10%.
その他の元素については必要に応じて、Ｍｇ：０．１〜１０％、Ｃａ：０．００１〜５％、Ｓｒ：０．００５〜２％、Ｍｎ：０．０１〜２％、Ｃｒ：０．０１〜２％、Ｍｏ：０．０１〜２％、Ｓｎ：０．１〜１０％の１種または２種以上を含有することができる。これらの元素はＡｌ系めっき層の耐食性をより向上させることができる。 About other elements, Mg: 0.1-10%, Ca: 0.001-5%, Sr: 0.005-2%, Mn: 0.01-2%, Cr: 0.1% as needed. One or two or more of 01 to 2%, Mo: 0.01 to 2%, Sn: 0.1 to 10% can be contained. These elements can further improve the corrosion resistance of the Al-based plating layer.
本発明において、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。めっき付着量は通常の片面３０〜１００ｇ／ｍ2 の範囲でなんら問題ない。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。 In the present invention, the amount of adhesion, plating pretreatment, post-treatment, etc. are not particularly limited. There is no problem with the amount of plating attached within the range of 30 to 100 g / m 2 on a normal side. As the post-plating treatment, there may be a chromate treatment, a resin coating treatment, etc. for the purpose of primary rust prevention and lubricity, but the organic resin disappears when heated, which is not preferable. In consideration of the recent hexavalent chromium regulation, the chromate treatment is preferably a trivalent treatment film such as electrolytic chromate.
Ａｌ系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系めっきは現在工業的に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，Ｆｅ系プレめっき等もありうるが、これも適用可能である。 The production method of the Al-based plated steel sheet is not limited at all. Usual steelmaking and hot rolling conditions are applicable. Al-based plating is currently industrially usually performed by a hot dipping method, but is not limited thereto, and electroplating from a non-aqueous solvent, vapor deposition, or the like can also be used. Ni, Fe-based pre-plating or the like may be used as the plating pretreatment, but this is also applicable.
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冷延鋼板（板厚０．８ｍｍ）を材料として、溶融Ａｌめっきを行った。溶融Ａｌ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両面１２０ｇ／ｍ2 に調節してその後冷却し、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−１０％Ｓｉ−２％Ｆｅであった。浴中のＦｅは浴中のめっき機器やスリップから供給される不可避のものである。めっき外観は不めっき等なく良好であった。Ａｌめっき前の焼鈍時の板温を変えることで、強度レベルの制御をした。このようにして製造した溶融Ａｌめっき鋼板の耐酸化性、高温強度を評価した。その結果を表２に示す。
Next, the present invention will be described in more detail with reference to examples.
(Example 1)
Using a cold-rolled steel plate (thickness 0.8 mm) having a steel component as shown in Table 1 that had undergone normal hot rolling and cold rolling processes, hot-dip Al plating was performed. For hot-dip Al plating, a non-oxidation furnace-reduction furnace type line was used. After plating, the amount of plating adhered was adjusted to 120 g / m 2 on both sides by gas wiping, followed by cooling and zero spangle treatment. The plating bath composition at this time was Al-10% Si-2% Fe. Fe in the bath is inevitable supplied from plating equipment or slip in the bath. The plating appearance was good with no plating. The strength level was controlled by changing the plate temperature during annealing before Al plating. The oxidation resistance and high temperature strength of the hot-dip Al-plated steel sheet produced in this way were evaluated. The results are shown in Table 2.
（１）耐酸化性
５０×５０ｍｍの試料を７００℃で保定した大気炉中に挿入して２００ｈｒ保定した。加熱後の外観から耐酸化性を評価した。耐酸化性の良くない試料は表面に鉄の酸化起因の赤スケールが発生するため、これの有無で判定した。このとき製品バラツキを明確にするために、各１０枚づつ試験を行ない、１枚でも赤スケールが発生したものは赤スケール発生との評価とした。
○：赤スケール無し
×：赤スケール発生
（２）高温強度
ＪＩＳ Ｇ ０５６７に準拠した高温引張試験を実施し、６００℃における圧延方向の引張強さで評価した。
○：ＴＳ２００ＭＰａ以上
×：ＴＳ２００ＭＰａ未満
(1) Oxidation resistance A 50 × 50 mm sample was inserted into an atmospheric furnace held at 700 ° C. and held for 200 hours. The oxidation resistance was evaluated from the appearance after heating. The sample with poor oxidation resistance produced a red scale due to oxidation of iron on the surface, and was judged by the presence or absence of this. At this time, in order to clarify the product variation, a test was performed for each 10 sheets, and the evaluation that the red scale was generated was generated even if one sheet had a red scale.
○: No red scale ×: Red scale generated (2) High-temperature strength A high-temperature tensile test based on JIS G 0567 was performed, and the tensile strength in the rolling direction at 600 ° C. was evaluated.
○: TS200 MPa or more ×: TS less than 200 MPa
Ｎｏ．１のＮｂを添加しない成分系においては、十分な高温強度が得られなかった。また、Ｎｏ．５，６のＮｂを添加し、Ｍｎ，Ｍｏを高めた系については、１０枚の耐酸化性試験において１〜３枚の赤スケール発生が認められた。これ以外の水準の試験においては、耐酸化性、高温強度共に優れた溶融Ａｌめっき鋼板が得られた。 No. In the component system to which 1 Nb was not added, sufficient high-temperature strength was not obtained. No. In the system in which 5 and 6 Nb were added to increase Mn and Mo, 1 to 3 red scales were observed in 10 oxidation resistance tests. In other tests, a hot-dip Al-plated steel sheet excellent in both oxidation resistance and high-temperature strength was obtained.
（実施例２）
表１のＮｏ．７の冷延鋼板を使用して、表３に示すようにＡｌ系めっきのめっき組成を変更した。めっき付着量は両面約１２０ｇ／ｍ2 で一定とした。こうして得られたＡｌ系めっき鋼板の耐酸化性と高温強度を評価した。高温強度はめっき組成によらずほぼ一定で、良好であった。また、耐酸化性もＺｎ含有量増大に伴い、表面のＺｎ酸化物と思われる粉体の付着は認められたが、赤スケールは全水準において発生しなかった。
(Example 2)
No. in Table 1 The cold-rolled steel sheet No. 7 was used and the plating composition of the Al-based plating was changed as shown in Table 3. The plating adhesion amount was constant at about 120 g / m 2 on both sides. The oxidation resistance and high temperature strength of the Al-based plated steel sheet thus obtained were evaluated. The high temperature strength was almost constant regardless of the plating composition and was good. In addition, with respect to oxidation resistance, as the Zn content increased, adhesion of powder that was thought to be Zn oxide on the surface was observed, but red scale did not occur at all levels.
特許出願人 新日本製鐡株式会社
代理人 弁理士 椎 名 彊 他１
Patent applicant: Nippon Steel Corporation
Attorney Attorney Shiina and others 1
Claims (6)
Ｃ ：０．００１〜０．２５％、
Ｓｉ：０．００１〜０．０２５％、
Ｍｎ：０．４２〜０．９５％、
Ｐ ：０．００３〜０．０２５％、
Ｎｂ：０．０１〜０．５％
を含有し、残部が鉄および不可避的不純物である鋼の表面にＡｌを主体とする金属被覆を有することを特徴とする高温強度、耐酸化性に優れた溶融Ａｌ系めっき鋼板。 % By mass
C: 0.001 to 0.25%,
Si: 0.001 to 0.025%,
Mn: 0.42 to 0.95%,
P: 0.003-0.025%,
Nb: 0.01 to 0.5%
A hot-dip, Al-plated steel sheet excellent in high-temperature strength and oxidation resistance, characterized by having a metal coating mainly composed of Al on the surface of steel containing iron and the inevitable impurities.
Ｎｉ：０．０１〜０．１％、
Ｃｕ：０．０１〜０．１％、
Ｂ ：０．０００３〜０．００１％
の１種または２種以上を含有することを特徴とする請求項１または２に記載の高温強度、耐酸化性に優れた溶融Ａｌ系めっき鋼板。 % By mass, further Ni: 0.01 to 0.1%,
Cu: 0.01 to 0.1%,
B: 0.0003 to 0.001%
1 or 2 types or more of these, The hot-dip Al type plated steel plate excellent in high temperature strength and oxidation resistance of Claim 1 or 2 characterized by the above-mentioned.
Ｍｇ：０．１〜１０％、
Ｃａ：０．００１〜５％、
Ｓｒ：０．００５〜２％、
Ｍｎ：０．０１〜２％、
Ｃｒ：０．０１〜２％、
Ｍｏ：０．０１〜２％、
Ｓｎ：０．１〜１０％
の１種または２種以上を含有することを特徴とする請求項１〜５に記載の高温強度、耐酸化性に優れた溶融Ａｌ系めっき鋼板。 The composition of the Al-based metal coating is mass%, and further Mg: 0.1 to 10%,
Ca: 0.001 to 5%,
Sr: 0.005 to 2%,
Mn: 0.01-2%
Cr: 0.01-2%
Mo: 0.01-2%
Sn: 0.1 to 10%
1 type or 2 types or more of these are included, The hot-melting Al type plated steel plate excellent in the high temperature strength and oxidation resistance of Claims 1-5 characterized by the above-mentioned.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003315096A JP2005015907A (en) | 2003-06-05 | 2003-09-08 | Molten al-based galvanized steel sheet having excellent high-temperature strength and oxidation resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003160495 | 2003-06-05 | ||
| JP2003315096A JP2005015907A (en) | 2003-06-05 | 2003-09-08 | Molten al-based galvanized steel sheet having excellent high-temperature strength and oxidation resistance |
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| JP2007327116A (en) * | 2006-06-09 | 2007-12-20 | Nisshin Steel Co Ltd | High-strength hot-dip aluminum-plated steel sheet for fuel tank |
| JP2009120943A (en) * | 2007-10-24 | 2009-06-04 | Nippon Steel Corp | Aluminum-based alloy plated steel sheet having excellent oxidation resistance and spot weldability |
| KR101205183B1 (en) | 2010-06-18 | 2012-11-27 | 한국기계연구원 | Aluminum - zinc alloys |
| KR101473550B1 (en) | 2010-06-21 | 2014-12-16 | 신닛테츠스미킨 카부시키카이샤 | Hot-dip al-coated steel sheet with excellent thermal blackening resistance and process for production of same |
| JP2015214747A (en) * | 2014-04-23 | 2015-12-03 | Ｊｆｅスチール株式会社 | MOLTEN Al-Zn-BASED PLATED SHEET STEEL, AND PRODUCTION METHOD THEREOF |
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| JP2017536472A (en) * | 2014-09-05 | 2017-12-07 | ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトＴｈｙｓｓｅｎＫｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ ＡＧ | Flat steel product having Al coating, flat steel product manufacturing method, steel member, and steel member manufacturing method |
| KR101889193B1 (en) | 2016-12-22 | 2018-08-16 | 주식회사 포스코 | Cold-rolled steel sheet having excellent corrosion resistance and formability and method for manufacturing the same |
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| US11807941B2 (en) | 2009-03-13 | 2023-11-07 | Bluescope Steel Limited | Corrosion protection with Al/Zn-based coatings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007327116A (en) * | 2006-06-09 | 2007-12-20 | Nisshin Steel Co Ltd | High-strength hot-dip aluminum-plated steel sheet for fuel tank |
| JP2009120943A (en) * | 2007-10-24 | 2009-06-04 | Nippon Steel Corp | Aluminum-based alloy plated steel sheet having excellent oxidation resistance and spot weldability |
| US11840763B2 (en) | 2008-03-13 | 2023-12-12 | Bluescope Steel Limited | Metal-coated steel strip |
| US11807941B2 (en) | 2009-03-13 | 2023-11-07 | Bluescope Steel Limited | Corrosion protection with Al/Zn-based coatings |
| KR101205183B1 (en) | 2010-06-18 | 2012-11-27 | 한국기계연구원 | Aluminum - zinc alloys |
| KR101473550B1 (en) | 2010-06-21 | 2014-12-16 | 신닛테츠스미킨 카부시키카이샤 | Hot-dip al-coated steel sheet with excellent thermal blackening resistance and process for production of same |
| JP2015214747A (en) * | 2014-04-23 | 2015-12-03 | Ｊｆｅスチール株式会社 | MOLTEN Al-Zn-BASED PLATED SHEET STEEL, AND PRODUCTION METHOD THEREOF |
| JP2017536472A (en) * | 2014-09-05 | 2017-12-07 | ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトＴｈｙｓｓｅｎＫｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ ＡＧ | Flat steel product having Al coating, flat steel product manufacturing method, steel member, and steel member manufacturing method |
| KR101657833B1 (en) | 2014-12-24 | 2016-09-20 | 주식회사 포스코 | Aluminum clad steel sheet having excellent high temperature brazing-resistance and strength and manufacturing method thereof |
| KR20160078797A (en) * | 2014-12-24 | 2016-07-05 | 주식회사 포스코 | Aluminum clad steel sheet having excellent high temperature brazing-resistance and strength and manufacturing method thereof |
| KR101889193B1 (en) | 2016-12-22 | 2018-08-16 | 주식회사 포스코 | Cold-rolled steel sheet having excellent corrosion resistance and formability and method for manufacturing the same |
| KR20190077874A (en) * | 2017-12-26 | 2019-07-04 | 주식회사 포스코 | Cold-rolled steel sheet for exhaust system having excellent corrosion resistance and formability ad manufacturing method thereof |
| KR102031457B1 (en) | 2017-12-26 | 2019-10-11 | 주식회사 포스코 | Cold-rolled steel sheet for exhaust system having excellent corrosion resistance and formability ad manufacturing method thereof |
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