JP2000290762A - Production of hot dip metal coated steel sheet - Google Patents
Production of hot dip metal coated steel sheetInfo
- Publication number
- JP2000290762A JP2000290762A JP10039999A JP10039999A JP2000290762A JP 2000290762 A JP2000290762 A JP 2000290762A JP 10039999 A JP10039999 A JP 10039999A JP 10039999 A JP10039999 A JP 10039999A JP 2000290762 A JP2000290762 A JP 2000290762A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- hot
- plating
- dip
- atmosphere
- 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.)
- Pending
Links
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、溶融めっき鋼板の
製造方法に係わり、さらに詳しくは、例えば自動車用、
家電用、建材用に適用可能な溶融めっき性に優れた溶融
めっき鋼板の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a hot-dip coated steel sheet,
The present invention relates to a method for manufacturing a hot-dip coated steel sheet having excellent hot-dipability that can be applied to home appliances and building materials.
【０００２】[0002]
【従来の技術】溶融めっき鋼板は、通常、鋼板を脱脂
後、無酸化炉において予熱し、次に還元炉において、表
面の清浄化および材質確保のために、還元焼鈍を行い、
その後、溶融めっき浴に浸漬することにより製造され
る。2. Description of the Related Art Hot-dip coated steel sheets are usually preheated in a non-oxidizing furnace after degreasing the steel sheets, and then subjected to reduction annealing in a reduction furnace to clean the surface and secure the material.
Then, it is manufactured by dipping in a hot-dip plating bath.
【０００３】また近年、自動車の燃費向上を目的とし
て、車体の軽量化のために、めっき鋼板の鋼中に、Ｓ
ｉ，Ｍｎ，Ｃｒなどの合金元素を積極的に添加して、鋼
板の高強度化を図ったものが使用されている。めっき前
の還元焼鈍の際の雰囲気は、Ｆｅには、還元性であって
も、Ｓｉ，Ｍｎ，Ｃｒなどにとっては、酸化性である。
すなわち、該高強度鋼板を、例えば溶融亜鉛めっきする
場合、還元焼鈍時に、Ｓｉ，Ｍｎ，Ｃｒなどの易酸化性
元素が選択的に酸化されて酸化物となり、鋼板表面でい
わゆる濃化皮膜（表面酸化物）を形成する。[0003] In recent years, in order to improve the fuel efficiency of automobiles, in order to reduce the weight of vehicle bodies, S
A steel plate is used in which alloy elements such as i, Mn, and Cr are positively added to increase the strength of the steel sheet. The atmosphere during the reduction annealing before plating is reductive to Fe, but oxidative to Si, Mn, Cr and the like.
That is, when the high-strength steel sheet is hot-dip galvanized, for example, during reductive annealing, easily oxidizable elements such as Si, Mn, and Cr are selectively oxidized to oxides, and a so-called concentrated film (surface) is formed on the steel sheet surface. Oxide).
【０００４】該酸化物は、溶融金属との濡れ性が著しく
悪く、かつ形成されためっき層との密着性も悪いため、
鋼板に溶融金属が付着しない、いわゆる“不めっき”が
しばしば発生する（溶融めっき性が劣る）。このため、
従来は特開昭５５−１２２８６５号公報に開示されてい
るように、無酸化炉型焼鈍炉で鋼板を予め酸化して鉄系
酸化物を生成し、その後、還元することにより易酸化性
元素の酸化物を減少させてから、溶融めっきする方法が
採られている。[0004] The oxide has extremely poor wettability with molten metal and poor adhesion with the formed plating layer.
The so-called “non-plating”, in which the molten metal does not adhere to the steel sheet, often occurs (poor hot-dipability). For this reason,
Conventionally, as disclosed in JP-A-55-122865, a steel sheet is oxidized in advance in a non-oxidizing furnace type annealing furnace to form an iron-based oxide, and then reduced to reduce the oxidizable element. A method of performing hot-dip plating after reducing oxides has been adopted.
【０００５】該無酸化炉を用いる方法は、鋼板表面をバ
ーナーの火炎または排気により加熱し、炉内の雰囲気、
すなわち空気比を制御して、鋼板を酸化または還元する
方式である。したがって、微妙な空気比の変化により鋼
板表面の鉄系酸化物の存在量、状態等が微妙に変化し、
安定性を欠いたり、鉄系酸化物が不足したり、鋼板表面
の清浄化が十分でなく、溶融めっき性が不十分であると
いう問題があった。上記問題を解決するために、無酸化
炉を用いずに、易酸化性元素を含有する高強度鋼板に、
溶融めっきする方法が、特開平５−２７１８９４号公
報、特開平６−３０６５６１号公報、特開平７−２６８
５８５号公報、特開平７−３４２１０号公報、特開平１
０−２５９４６６号公報に開示されている。[0005] In the method using the non-oxidizing furnace, the surface of the steel sheet is heated by flame or exhaust of a burner, and the atmosphere in the furnace,
That is, the air ratio is controlled to oxidize or reduce the steel sheet. Therefore, the abundance, state, etc. of the iron-based oxide on the steel sheet surface change delicately due to delicate changes in the air ratio,
There were problems such as lack of stability, lack of iron-based oxides, insufficient cleaning of the steel sheet surface, and insufficient hot-dip plating properties. To solve the above problem, without using an oxidation-free furnace, to a high-strength steel sheet containing an easily oxidizable element,
The hot-dip plating method is described in JP-A-5-271894, JP-A-6-306561, and JP-A-7-268.
585, JP-A-7-34210, JP-A-1
No. 0-259466.
【０００６】特開平５−２７１８９４号公報には、無酸
化炉を経由しない鋼板を、露点の異なる２ゾーン以上に
分割された炉内で、酸化および還元を行なう方法が開示
されている。この場合、炉内の雰囲気を安定して制御で
きれば、目標通りの効果を達成することができるが、雰
囲気中の露点を安定して高精度に制御することが困難で
あり、露点の変化により酸化挙動あるいは還元挙動が変
化して、溶融めっき性が不安定であるという問題があっ
た。Japanese Patent Application Laid-Open No. Hei 5-271894 discloses a method of oxidizing and reducing a steel sheet which does not pass through a non-oxidizing furnace in a furnace divided into two or more zones having different dew points. In this case, if the atmosphere in the furnace can be controlled stably, the desired effect can be achieved.However, it is difficult to control the dew point in the atmosphere stably and with high accuracy. There was a problem that the behavior or the reduction behavior changed, and the hot-dipability was unstable.
【０００７】特開平６−３０６５６１号公報には、バー
ナーの火炎を高張力鋼板より遠ざけて、鋼板がその火炎
で直接酸化されないようにし、かつ酸素を０．０１〜５
ｖｏｌ％、水分を２ｖｏｌ％以上含む雰囲気中で酸化
後、水素を３ｖｏｌ％以上含む雰囲気中で還元焼鈍する
方法が開示されている。この場合、炉内の雰囲気を安定
して制御できれば、目標通りの効果を達成することがで
きるが、雰囲気中の水分を安定して高精度で制御するこ
とが困難であり、水分が２ｖｏｌ％以上の範囲で変化し
た場合、特に高温時に酸化挙動に変化が生じて、溶融め
っき性がばらつく問題があった。JP-A-6-306561 discloses that the flame of a burner is kept away from a high-tensile steel sheet so that the steel sheet is not directly oxidized by the flame, and oxygen is added to the steel sheet by 0.01 to 5 times.
A method is disclosed in which oxidation is performed in an atmosphere containing 2% by volume or more of water and then reduction annealing is performed in an atmosphere containing 3% by volume or more of hydrogen. In this case, if the atmosphere in the furnace can be controlled stably, the desired effect can be achieved, but it is difficult to control the moisture in the atmosphere stably and with high accuracy, and the moisture content is 2 vol% or more. When the temperature changes within the range described above, there is a problem that the oxidation behavior changes, particularly at high temperatures, and the hot-dipability varies.
【０００８】特開平７−２６８５８５号公報には、酸素
を０．０１〜５ｖｏｌ％、水分を２ｖｏｌ％以上含む雰
囲気中で、特定の昇温速度で高張力鋼板を酸化後、水素
を３ｖｏｌ％以上含む雰囲気中で還元焼鈍する方法が開
示されている。この場合も上記と同様な問題点があっ
た。Japanese Patent Application Laid-Open No. 7-268585 discloses that a high-strength steel sheet is oxidized at a specific heating rate in an atmosphere containing 0.01 to 5 vol% of oxygen and 2 vol% or more of moisture, and then hydrogen is added at 3 vol% or more. A method of performing reduction annealing in an atmosphere containing the same is disclosed. Also in this case, there was a problem similar to the above.
【０００９】特開平７−３４２１０号公報には、焼鈍炉
の予熱帯において、（酸素＋窒素）雰囲気を制御して、
温度４００〜６５０℃で高張力鋼板を酸化する方法が開
示されている。この場合、雰囲気制御が安定して、適正
量の鉄系酸化物を生成することができれば、目標通りの
効果を達成することができるが、予熱帯を必要とするこ
とから、設備費の増大が避けられない。また、４００〜
６５０℃の温度では、鋼種によっては適正量の鉄系酸化
物を生成することができず、十分な溶融めっき性を確保
することができないという問題があった。Japanese Patent Application Laid-Open No. 7-34210 discloses that an (oxygen + nitrogen) atmosphere is controlled in a pre-tropical zone of an annealing furnace.
A method for oxidizing a high-strength steel sheet at a temperature of 400 to 650 ° C is disclosed. In this case, if the atmosphere control is stable and an appropriate amount of iron-based oxide can be generated, the desired effect can be achieved. However, since pre-tropical zone is required, equipment cost increases. Inevitable. Also, 400-
At a temperature of 650 ° C., an appropriate amount of iron-based oxide cannot be produced depending on the type of steel, and there has been a problem that sufficient hot-dip plating cannot be ensured.
【００１０】特開平１０−２５９４６６号公報には、無
酸化炉を有しない溶融めっきラインにおいて、硝酸イオ
ンを含む酸化剤溶液中に浸漬し、鉄系酸化物が０．０１
〜１ｇ／ｍ2 となるように酸化を行なう方法が開示され
ている。この場合、酸化剤溶液に浸漬する必要があるた
め、設備費の増大は避けられない。また酸化剤溶液の使
用によるコストアップを回避できない問題があった。[0010] Japanese Patent Application Laid-Open No. 10-259466 discloses that in a hot-dip plating line having no non-oxidizing furnace, an iron-based oxide is immersed in an oxidizing agent solution containing nitrate ions to reduce the amount of iron-based oxide to 0.01.
A method of performing oxidation so as to be 1 g / m 2 is disclosed. In this case, since it is necessary to immerse in an oxidizing agent solution, an increase in equipment cost is inevitable. Further, there is a problem that the cost increase due to the use of the oxidizing agent solution cannot be avoided.
【００１１】[0011]
【発明が解決しようとする課題】本発明は、安価でかつ
安定して溶融めっき性の良好な溶融めっき鋼板の製造方
法を提供することを目的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a hot-dip coated steel sheet which is inexpensive, stable and excellent in hot-dip coating properties.
【００１２】[0012]
【課題を解決するための手段】上記の目的を解決するた
めの本発明は、加熱設備を有する連続溶融めっき設備を
用いて、溶融めっき鋼板を製造するに際し、酸素を０．
０１〜５ｖｏｌ％含有し、残部が窒素からなり、かつ実
質的に水を含まない雰囲気中、６５０℃超の温度で鋼板
を加熱処理した後、実質的に水を含まない還元性雰囲気
で還元してから、めっき浴に浸漬して溶融めっき処理す
ることを特徴とする溶融めっき鋼板の製造方法である。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for producing hot-dip coated steel sheets by using a continuous hot-dip coating equipment having a heating equipment.
After heat-treating the steel sheet at a temperature of more than 650 ° C. in an atmosphere containing 0.1 to 5 vol%, the balance being nitrogen and containing substantially no water, the steel sheet is reduced in a reducing atmosphere containing substantially no water. A hot-dip galvanized steel sheet which is immersed in a plating bath and then subjected to a hot-dip plating process.
【００１３】好ましい本発明は、前記加熱処理により、
鋼板表面に片面当たり２μｍ以下の厚さの鉄系酸化物層
を形成することを特徴とする溶融めっき鋼板の製造方法
である。[0013] In a preferred aspect of the present invention, the heat treatment
A method for producing a hot-dip coated steel sheet, wherein an iron-based oxide layer having a thickness of 2 μm or less per side is formed on the surface of the steel sheet.
【００１４】[0014]
【発明の実施の形態】以下に、本発明を詳細に説明す
る。本発明は、加熱設備を有する連続溶融めっき設備を
用いて実施される。本発明の加熱設備は、オールラジア
ント式、誘導加熱式、ガスジェット式、通電加熱式、電
気炉式であるのが好ましい。オールラジアント式が実用
性の点で最も優れている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The present invention is implemented using a continuous hot-dip plating facility having a heating facility. The heating equipment of the present invention is preferably of an all-radiant type, an induction heating type, a gas jet type, a current heating type, or an electric furnace type. The all-radiant type is the best in terms of practicality.
【００１５】無酸化炉型焼鈍炉においては、バーナーの
火炎やその排気により、加熱する方式であるため、鋼板
の幅方向、長手方向とも雰囲気が均一でなく、酸化条件
が不安定になるため、無酸化炉型の加熱設備では、安定
して均一な鉄系酸化物層を形成できない。本発明の加熱
設備は、バーナーの火炎やその排気により加熱する方式
とは異なる方式であり、下記の雰囲気の加熱帯を構築す
る。この加熱帯において、鋼板の幅方向、長手方向の双
方向の雰囲気を均一にし、鋼板表面に均一な鉄系酸化物
層を形成することができる。また、前記加熱帯は、酸素
が０．０１〜５ｖｏｌ％，残部が窒素からなる雰囲気
で、かつ実質的に水を含まない雰囲気で満たす必要があ
る。In the non-oxidizing furnace type annealing furnace, since the heating is performed by the flame of the burner or the exhaust thereof, the atmosphere is not uniform in the width direction and the longitudinal direction of the steel sheet, and the oxidation conditions become unstable. The non-oxidizing furnace type heating equipment cannot form a stable and uniform iron-based oxide layer. The heating equipment of the present invention is a method different from the method of heating by the flame of the burner or the exhaust from the burner, and constructs a heating zone of the following atmosphere. In this heating zone, the atmosphere in both the width direction and the longitudinal direction of the steel sheet can be made uniform, and a uniform iron-based oxide layer can be formed on the steel sheet surface. Further, it is necessary to fill the heating zone with an atmosphere containing 0.01 to 5% by volume of oxygen and the balance being nitrogen and containing substantially no water.
【００１６】実質的に水を含まない雰囲気とは、積極的
に加湿した雰囲気ではないという意味であり、大気中に
含まれる程度の微量の水を含んでいても差支えない。こ
の雰囲気は露点を−２０℃以下にすることが好ましい。
実質的に（窒素＋酸素）からなる雰囲気は、空気と窒素
ガスの混合比を調整することで、容易に制御することが
可能であり、ガス量を減量でき、混合装置も従来に比べ
簡略化できる。したがって大幅な製造費の低減が可能で
ある。雰囲気を実質的に水を含まない状態にすることに
より、水分量の変化による鋼板の酸化挙動の変化を防止
するためであるが、加湿器等の設備を省略できるという
付加的効果もある。An atmosphere that does not substantially contain water means that the atmosphere is not an actively humidified atmosphere, and a slight amount of water contained in the atmosphere may be contained. This atmosphere preferably has a dew point of −20 ° C. or less.
The atmosphere consisting essentially of (nitrogen + oxygen) can be easily controlled by adjusting the mixing ratio of air and nitrogen gas, the amount of gas can be reduced, and the mixing device is simplified as compared with the conventional one. it can. Therefore, it is possible to significantly reduce manufacturing costs. By making the atmosphere substantially free of water, it is possible to prevent the oxidation behavior of the steel sheet from changing due to the change in the amount of water, but there is an additional effect that equipment such as a humidifier can be omitted.
【００１７】酸素濃度を０．０１〜５ｖｏｌ％と規定し
たのは、０．０１ｖｏｌ％未満であると、鋼板表面に鉄
系酸化物が十分に生成せず、本発明の溶融めっき性の改
善効果の達成が十分でない。また、酸素濃度が５ｖｏｌ
％超であると、溶融めっき性の改善効果が飽和する一方
で、鋼板表面に鉄系酸化物が必要以上に生成するので、
めっき設備内を搬送中に鉄系酸化物が剥離し、鋼板表面
に付着して、異物付着欠陥を引き起こしたり、溶融めっ
き浴中でのドロス発生量が増加するなどの不具合を引き
起こす。さらに、加熱帯自体の酸化劣化が顕著になるの
で、メンテナンスに手間、時間を要するという問題があ
るからである。The reason why the oxygen concentration is defined as 0.01 to 5 vol% is that if the oxygen concentration is less than 0.01 vol%, iron-based oxides are not sufficiently generated on the surface of the steel sheet, and the effect of improving the hot-dipability of the present invention is obtained. Achievement is not enough. The oxygen concentration is 5 vol.
%, The effect of improving hot-dip coating is saturated, but iron-based oxides are generated more than necessary on the steel sheet surface.
The iron-based oxide peels during transportation in the plating equipment and adheres to the surface of the steel sheet, causing defects such as foreign matter adhesion defects and an increase in the amount of dross generated in the hot-dip plating bath. Furthermore, since the oxidative deterioration of the heating zone itself becomes remarkable, there is a problem that maintenance requires time and effort.
【００１８】鋼板は上記の雰囲気で、鋼板温度を６５０
℃超に加熱しなければならない。６５０℃以下では、十
分な鉄系酸化物が生成しない。さらにこの加熱処理の際
に、鋼の再結晶を同時に実施するために、再結晶温度で
加熱処理するのが好適である。一方鋼の再結晶温度を大
きく越えると、鋼板の材質確保に要する温度以上に加熱
することになり、製造コストを押し上げることになる。
再結晶温度で加熱処理する場合、加熱時間は３０秒以下
が好ましい。３０秒を超えると溶融めっき性の改善効果
が飽和し、設備費の増大または鋼板搬送速度の低下を引
き起こすことになり、好ましくない。さらに好ましいの
は、再結晶温度で１〜１０秒間加熱保持する場合であ
る。再結晶温度で１秒未満であると、溶融めっき性の改
善効果が安定せず、一方再結晶温度で１０秒を超える
と、溶融めっき性の改善効果が飽和するからである。The steel sheet is heated at 650 in the above atmosphere.
Must be heated above ℃. At 650 ° C. or lower, sufficient iron-based oxide is not generated. Further, at the time of this heat treatment, in order to simultaneously carry out the recrystallization of the steel, it is preferable to carry out the heat treatment at the recrystallization temperature. On the other hand, if the recrystallization temperature of the steel is greatly exceeded, the steel sheet is heated to a temperature higher than the temperature required for securing the material of the steel sheet, and the production cost is increased.
When performing the heat treatment at the recrystallization temperature, the heating time is preferably 30 seconds or less. If the time exceeds 30 seconds, the effect of improving the hot-dip coating property is saturated, which leads to an increase in equipment cost or a decrease in the speed at which the steel sheet is conveyed. More preferably, the heating and holding are performed at the recrystallization temperature for 1 to 10 seconds. If the recrystallization temperature is less than 1 second, the effect of improving the hot-dip plating property is not stable, while if the temperature exceeds 10 seconds at the recrystallization temperature, the effect of improving the hot-dip plating property is saturated.
【００１９】本発明が適用される鋼種は、特に限定され
るものではないが、例えば、鋼中に添加される不可避的
不純物が鋼板中に何らかの原因で偏在すると、その部分
だけ、溶融めっき時の鋼板からのＦｅと亜鉛めっき層か
らのＺｎの拡散反応が促進、あるいは抑制されて合金相
の生成が不均一になり、めっき密着性がばらつく。特に
溶融めっき後に合金化処理した合金化溶融めっき鋼板に
おいては、部分的に合金化反応速度が異なって、いわゆ
る筋状の“焼けむら”といわれる表面欠陥を引き起こ
す。このような、母材起因の表面欠陥を抑制するため
に、本発明では、めっき前工程において、加熱帯で鋼板
表面に均一な鉄系酸化物を生成させ、その後、還元処理
することで鋼板表面に均一な還元鉄層を形成させ、鋼板
とめっき層間の合金化反応を均一化して、表面欠陥を防
止するものである。The type of steel to which the present invention is applied is not particularly limited. For example, if unavoidable impurities added to steel are unevenly distributed in the steel plate for some reason, only that portion is subjected to hot-dip plating. The diffusion reaction between Fe from the steel sheet and Zn from the galvanized layer is promoted or suppressed, so that the formation of an alloy phase becomes non-uniform and the plating adhesion varies. In particular, in the alloyed hot-dip coated steel sheet subjected to alloying treatment after hot-dip coating, the alloying reaction rate partially differs, causing a so-called streak-like surface defect called “burn unevenness”. In order to suppress such surface defects caused by the base material, in the present invention, in the pre-plating step, a uniform iron-based oxide is generated on the surface of the steel sheet in the heating zone, and then the reduction treatment is performed. To form a uniform reduced iron layer, thereby making the alloying reaction between the steel sheet and the plating layer uniform, thereby preventing surface defects.
【００２０】さらに、本発明は、鋼中にＳｉ，Ｍｎ，Ｃ
ｒのような易酸化性元素を合計で１．０ｗｔ％以上含有
する鋼板を、溶融めっきする場合に好適である。通常溶
融めっきラインでの加熱処理（再結晶焼鈍）は、（窒素
＋水素）雰囲気中で行なわれる。この雰囲気は、前述の
通り、鉄には還元性雰囲気であっても、Ｓｉ，Ｍｎ，Ｃ
ｒのような易酸化性元素には、酸化性雰囲気である。す
なわち、前記のような鋼板を母材として溶融めっき鋼板
を製造する場合、加熱処理（再結晶焼鈍）時に、Ｓｉ，
Ｍｎ，Ｃｒのような易酸化性元素が選択的に酸化され、
酸化物となる。Further, the present invention relates to a method for producing Si, Mn, C
This is suitable for hot-dip coating a steel sheet containing a total of 1.0 wt% or more of an easily oxidizable element such as r. Usually, the heat treatment (recrystallization annealing) in the hot-dip plating line is performed in a (nitrogen + hydrogen) atmosphere. This atmosphere is, as described above, even if iron is a reducing atmosphere, Si, Mn, C
An easily oxidizable element such as r has an oxidizing atmosphere. That is, when a hot-dip coated steel sheet is manufactured using the above-described steel sheet as a base material, Si,
Oxidizable elements such as Mn and Cr are selectively oxidized,
Oxides.
【００２１】このような酸化物は、前述の通り“不めっ
き”といわれる表面欠陥の原因になる。このような表面
欠陥を抑制するために、本発明では、加熱帯で鋼板表面
に２μｍ以下の厚さの鉄系酸化物を形成する。その後、
これを還元することで、Ｓｉ，Ｍｎ，Ｃｒのような易酸
化性元素の選択的酸化を防止し、かつ鋼板表面に均一な
還元鉄層を形成し、鋼板と溶融金属との濡れ性を向上さ
せて、表面欠陥を防止することができる。Such an oxide causes a surface defect called "non-plating" as described above. In order to suppress such surface defects, in the present invention, an iron-based oxide having a thickness of 2 μm or less is formed on the steel sheet surface in the heating zone. afterwards,
By reducing this, selective oxidation of easily oxidizable elements such as Si, Mn, and Cr is prevented, and a uniform reduced iron layer is formed on the surface of the steel sheet to improve the wettability between the steel sheet and the molten metal. Thus, surface defects can be prevented.
【００２２】ここで鉄系酸化物は、Ｆｅ3 Ｏ4 ，Ｆｅ2
Ｏ3 ，ＦｅＯを主成分とする複合酸化物であり、微量の
Ｓｉ，Ｍｎ，Ｃｒなどを含む場合もある。鉄系酸化物層
の厚みが２μｍを超えると、加熱設備内を搬送中に、鋼
板から剥離し、加熱設備を汚染したり、ロールに付着
し、鋼板の欠陥を引き起こす問題があるので、好ましく
ない。また、鉄系酸化物層の厚みが０．２μｍ未満で
は、溶融めっき性の改善効果が小さいため好ましくな
い。よって０．２〜２μｍであるのが好ましい。鉄系酸
化物層の厚さは、平均厚さであり、例えば、断面を光学
的顕微鏡で観察し、任意の１０点の厚さを測定し、その
平均値を求めたものである。Here, the iron-based oxide is Fe 3 O 4 , Fe 2
It is a composite oxide containing O 3 and FeO as main components, and may contain trace amounts of Si, Mn, Cr and the like. When the thickness of the iron-based oxide layer exceeds 2 μm, it is not preferable because there is a problem that the steel sheet is separated from the steel sheet during transportation in the heating equipment, contaminates the heating equipment or adheres to a roll, and causes a defect of the steel sheet. . On the other hand, if the thickness of the iron-based oxide layer is less than 0.2 μm, the effect of improving the hot-dip plating properties is small, which is not preferable. Therefore, the thickness is preferably 0.2 to 2 μm. The thickness of the iron-based oxide layer is an average thickness. For example, the thickness is obtained by observing a cross section with an optical microscope, measuring the thickness at any 10 points, and calculating the average value.
【００２３】本発明においては、加熱帯中の雰囲気と還
元帯の雰囲気を分割することが好ましい。そのために、
加熱帯の出口側および還元帯の入口側に仕切り壁を設け
たり、さらにシールロールを設けたり、加熱帯の出口側
および還元帯の入口側に接した位置に非酸化性雰囲気
（例えば、実質的に窒素からなる雰囲気）で満たされた
中間室を設けると、好適である。また加熱帯に直接、
（窒素＋酸素）雰囲気を供給するための供給設備および
加熱帯中の雰囲気を大気中に排出するための排気設備が
設置されていると、制御性が向上するので好ましい。加
熱帯中の雰囲気の酸素濃度を測定する分析計、および分
析計の指示値で供給雰囲気中の酸素濃度を制御する制御
弁等の制御機器が設置されているとさらによい。In the present invention, it is preferable to divide the atmosphere in the heating zone and the atmosphere in the reduction zone. for that reason,
A partition wall is provided on the outlet side of the heating zone and the inlet side of the reduction zone, a seal roll is further provided, and a non-oxidizing atmosphere (for example, substantially It is preferable to provide an intermediate chamber filled with a nitrogen atmosphere. Also directly into the heating zone,
It is preferable to provide a supply facility for supplying a (nitrogen + oxygen) atmosphere and an exhaust facility for exhausting the atmosphere in the heating zone to the atmosphere because controllability is improved. It is further preferable that a control device such as an analyzer for measuring the oxygen concentration in the atmosphere in the heating zone and a control valve for controlling the oxygen concentration in the supply atmosphere based on the indicated value of the analyzer be provided.
【００２４】本発明においては、加熱処理の前に、予め
鋼板表面を脱脂、酸洗浄することが好ましい。これは、
鋼板表面に前工程で生成した酸化物などが残存している
と、前記加熱設備内の加熱帯での鉄系酸化物生成が抑制
され、不均一になるからである。脱脂、酸洗浄を行い、
加熱処理することにより鋼板表面に鉄系酸化物層を均一
に生成することができ、溶融めっき性の改善効果の安定
性を高めることができる。脱脂、酸洗浄の手段としては
特に制限されないが、例えば、脱脂としては水酸化ナト
リウム水溶液等の脱脂液を使用し、電解脱脂、あるいは
浸漬脱脂等の従来法が使用できる。また酸洗浄として
は、塩酸水溶液等の酸洗浄液を使用し、浸漬酸洗浄等の
従来法が使用できる。In the present invention, the surface of the steel sheet is preferably degreased and acid-washed before the heat treatment. this is,
This is because if oxides and the like generated in the previous step remain on the surface of the steel sheet, the generation of iron-based oxides in the heating zone in the heating equipment is suppressed, and the oxides become uneven. Degreasing, acid cleaning,
By performing the heat treatment, an iron-based oxide layer can be uniformly formed on the surface of the steel sheet, and the stability of the hot-dipability improvement effect can be enhanced. Means for degreasing and acid washing are not particularly limited. For example, a conventional degreasing method such as electrolytic degreasing or immersion degreasing can be used using a degreasing solution such as an aqueous sodium hydroxide solution. As the acid cleaning, an acid cleaning liquid such as an aqueous hydrochloric acid solution is used, and a conventional method such as immersion acid cleaning can be used.
【００２５】図１は本発明を好適に実施することができ
る溶融めっき設備の一例を示す概略図である。鋼帯１
を、予め脱脂設備２、酸洗浄設備３において、脱脂、酸
洗浄した後、加熱設備１３内に搬送し、加熱帯４で鉄系
酸化物を鋼帯１の表面に形成する。次に該鋼帯１を、加
熱帯４と仕切り壁５で仕切った還元帯６に搬送し、還元
処理し、冷却設備８にてめっきに適した温度まで冷却
後、めっき浴１０に浸漬して、めっきする。めっき浴１
０より鋼帯１を垂直方向に引き上げ、付着量調整装置１
１にて、表面のめっき層厚さを調整し、合金化炉１２
で、加熱合金化処理して合金化溶融めっき鋼帯１が得ら
れる。FIG. 1 is a schematic diagram showing an example of a hot-dip plating facility in which the present invention can be suitably implemented. Steel strip 1
Is preliminarily degreased and acid-cleaned in the degreasing equipment 2 and the acid cleaning equipment 3, and then transported into the heating equipment 13, where the iron-based oxide is formed on the surface of the steel strip 1 in the heating zone 4. Next, the steel strip 1 is conveyed to a reduction zone 6 partitioned by a heating zone 4 and a partition wall 5, subjected to a reduction treatment, cooled to a temperature suitable for plating in a cooling facility 8, and then immersed in a plating bath 10. , Plating. Plating bath 1
Vertically pull up the steel strip 1 from 0 and adjust the adhesion amount 1
In step 1, the thickness of the plating layer on the surface was adjusted, and
Thus, the alloyed hot-dip steel strip 1 is obtained by the heat alloying treatment.
【００２６】上記加熱帯で鋼帯表面に鉄系酸化物を形成
した後、実質的に水を含まない還元性雰囲気、例えば実
質的に（窒素＋水素）のみからなる雰囲気中で還元す
る。実質的に水を含まない雰囲気とは、積極的に加湿し
た雰囲気ではないという意味であり、大気中に含まれる
程度の微量の水を含んでいても差支えない。この雰囲気
は、還元に適した温度、例えば６００〜９００℃で、露
点を−２０℃以下にすることが好ましい。After the iron-based oxide is formed on the surface of the steel strip in the heating zone, the iron-based oxide is reduced in a reducing atmosphere substantially free of water, for example, an atmosphere consisting essentially of (nitrogen + hydrogen). An atmosphere that does not substantially contain water means that the atmosphere is not an actively humidified atmosphere, and may contain a trace amount of water contained in the atmosphere. This atmosphere is preferably at a temperature suitable for reduction, for example, 600 to 900 ° C., and has a dew point of −20 ° C. or less.
【００２７】その後、めっきに適した温度、例えば４５
０〜５５０℃まで、鋼帯を冷却してから、溶融めっき浴
に浸漬して、溶融めっきすればよい。めっき条件は、特
に限定されるものではなく、例えば、亜鉛めっきの場
合、浴温４５０〜５２０℃で、浴中には従来の亜鉛めっ
きと同様に、アルミニウム０．１〜０．２ｗｔ％とその
他の不可避的不純物を含む亜鉛めっき浴を用いて、めっ
きすることができる。さらに、めっき付着量を調整した
後、加熱合金化処理してもよい。この場合、合金化炉内
で４５０〜６００℃の板温で、５〜３０秒間加熱すれば
よい。Thereafter, a temperature suitable for plating, for example, 45
The steel strip may be cooled to 0 to 550 ° C., then immersed in a hot-dip plating bath and hot-dip plated. The plating conditions are not particularly limited. For example, in the case of galvanizing, the bath temperature is 450 to 520 ° C., and in the bath, 0.1 to 0.2 wt% of aluminum and Can be plated using a galvanizing bath containing unavoidable impurities. Furthermore, after adjusting the plating adhesion amount, a heat alloying treatment may be performed. In this case, heating may be performed in an alloying furnace at a plate temperature of 450 to 600 ° C. for 5 to 30 seconds.
【００２８】[0028]
【実施例】以下に本発明を実施例に基づいて具体的に説
明する。 （実施例１）図１に示す、オールラジアント式の加熱設
備１３を有する溶融めっき設備を用いて、加熱、還元、
めっきの一連の処理を実施した。Ｓｉが０．７ｗｔ% 、
Ｍｎが１．５ｗｔ% 、Ｃｒが０．０１ｗｔ% およびその
他の不可避的不純物を含む高強度鋼帯（厚さ０．７ｍ
ｍ) を陽極として、８０℃の５ｗｔ％水酸化ナトリウム
水溶液中で、電解脱脂を行い、水洗後、５０℃の１０ｗ
ｔ％塩酸水溶液中で１０秒間の浸漬酸洗浄を行い、水洗
し、乾燥した。前記処理を行なった鋼帯を、鋼帯搬送速
度８０ｍ／分で、かつ表１に示す条件で加熱処理した。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments. (Example 1) Using a hot-dip plating facility having an all-radiant heating facility 13 shown in FIG.
A series of plating processes was performed. Si is 0.7wt%,
High-strength steel strip containing 1.5 wt% Mn, 0.01 wt% Cr and other unavoidable impurities (thickness 0.7 m
m) as an anode, electrolytic degreasing in a 5 wt% aqueous sodium hydroxide solution at 80 ° C., washing with water, and 10 watts at 50 ° C.
It was immersed in a t% hydrochloric acid aqueous solution for 10 seconds, washed with water, washed with water, and dried. The steel strip subjected to the above treatment was subjected to a heat treatment under the conditions shown in Table 1 at a steel strip transport speed of 80 m / min.
【００２９】次に水素を７ｖｏｌ％含有する窒素雰囲気
中で、板温８８０℃で、６０秒間の還元処理を行い、４
７０℃に冷却した後、浴温４７０℃のアルミニウムを
０．１４ｗｔ％含有する溶融亜鉛めっき浴に、約３秒間
浸漬し、溶融亜鉛めっきを行なった。その直後に、ガス
ワイパーで、付着量を片面で約５０ｇ／ｍ2 に調整し
て、溶融亜鉛めっき鋼帯を製造した。Next, in a nitrogen atmosphere containing 7 vol% of hydrogen, a reduction treatment is performed at a plate temperature of 880 ° C. for 60 seconds, and
After cooling to 70 ° C., it was immersed for about 3 seconds in a hot-dip galvanizing bath containing 0.14 wt% of aluminum at a bath temperature of 470 ° C. to perform hot-dip galvanizing. Immediately thereafter, the amount of adhesion was adjusted to about 50 g / m 2 on one side with a gas wiper to produce a hot-dip galvanized steel strip.
【００３０】上記条件にて、２４時間連続操業し、６時
間毎に、溶融亜鉛めっき鋼帯の任意の位置を４回サンプ
リングし、溶融めっき性（めっき外観、めっき密着性）
を下記の試験法に準じて測定し、下記の基準に従って評
価した。また加熱設備内をオンライン目視観察して、加
熱帯において鋼帯表面に形成された酸化物の密着性を評
価した。評価結果もあわせて表１に示した。Under the above conditions, continuous operation was performed for 24 hours, and an arbitrary position of the hot-dip galvanized steel strip was sampled four times every 6 hours, and hot-dip galvanizing property (plating appearance, plating adhesion)
Was measured according to the following test method, and evaluated according to the following criteria. In addition, the inside of the heating equipment was visually observed online to evaluate the adhesion of the oxide formed on the surface of the steel strip in the heating zone. The evaluation results are also shown in Table 1.
【００３１】（１）めっき外観 溶融亜鉛めっき鋼板のめっき表面を１０倍に拡大して、
不めっき面積率を測定し、３段階評価した。 ○＝不めっき全くなし △＝少なくとも１回のサンプリングで、僅かに不めっき
あり（不めっき面積率１％未満） ×＝少なくとも１回のサンプリングで、不めっきあり
（不めっき面積率１％以上）(1) Appearance of plating The surface of the galvanized steel sheet is magnified 10 times
The unplated area ratio was measured and evaluated in three steps. ○ = No plating at all △ = Slightly non-plated with at least one sampling (Unplated area ratio less than 1%) × = Unplated with at least one sampling (Unplated area ratio 1% or more)
【００３２】（２）めっき密着性 直径１／２インチの突起物上に、溶融亜鉛めっき鋼板を
載せ、その上方１ｍの高さから、重量１ｋｇの重りを鋼
板上に自然落下させるデュポン衝撃試験を行なった溶融
亜鉛めっき鋼板に、市販のセロファンテープを貼り、次
いで剥がして、接着力を４段階評価した。 ○＝めっき層の亀裂、剥離全くなし △＝少なくとも１回のサンプリングで、めっき層の亀裂
あり ×＝少なくとも１回のサンプリングで、めっき層の剥離
あり(2) Adhesion of plating A hot-dip galvanized steel sheet was placed on a projection having a diameter of 1/2 inch, and a 1 kg weight was dropped naturally on the steel sheet from a height of 1 m above the DuPont impact test. A commercially available cellophane tape was applied to the hot-dip galvanized steel sheet, and then peeled off, and the adhesive strength was evaluated on a four-point scale. ○ = No cracking or peeling of plating layer at all △ = Plating layer cracking at least once sampling × = Plating layer peeling at least once sampling
【００３３】（３）酸化物密着性 加熱設備内ののぞき窓から、炉内をカメラによりオンラ
イン観察して、加熱帯において鋼板表面に形成された酸
化物の密着性を目視で、２段階評価した。 ○＝酸化物の剥離なし ×＝酸化物の剥離あり(3) Oxide adhesion Adhesion of oxide formed on the surface of the steel sheet in the heating zone was visually evaluated in two stages by observing the inside of the furnace online with a camera through a viewing window in the heating equipment. . ○ = No oxide peeling × = Oxide peeling
【００３４】[0034]
【表１】 [Table 1]
【００３５】（実施例２）図１に示す、オールラジアン
ト式の加熱設備１３を有する溶融めっき設備を用いて、
加熱、還元、めっき、合金化の一連の処理を実施した。
Ｓｉが０．１ｗｔ% 、Ｍｎが１．７ｗｔ% 、Ｃｒが０．
０１ｗｔ% およびその他の不可避的不純物を含む高強度
鋼帯（厚さ０．８ｍｍ) を、８０℃の５ｗｔ％水酸化ナ
トリウム水溶液中で、電解脱脂を行い、水洗後、５０℃
の１０ｗｔ％塩酸水溶液中で１０秒間の浸漬酸洗浄を行
い、水洗し、乾燥した。前記処理を行なった鋼帯を、鋼
帯搬送速度８０ｍ／分で、かつ表２に示す条件で加熱処
理した。Example 2 Using a hot-dip plating facility having an all-radiant heating facility 13 shown in FIG.
A series of heating, reduction, plating, and alloying processes were performed.
0.1 wt% of Si, 1.7 wt% of Mn, and 0.1 wt% of Cr.
A high-strength steel strip (0.8 mm thick) containing 01 wt% and other unavoidable impurities is subjected to electrolytic degreasing in a 5 wt% aqueous sodium hydroxide solution at 80 ° C, washed with water, and then washed at 50 ° C.
Was immersed in a 10 wt% hydrochloric acid aqueous solution for 10 seconds, washed with water, and dried. The treated steel strip was heat-treated at a steel strip transport speed of 80 m / min and under the conditions shown in Table 2.
【００３６】次に水素を７ｖｏｌ％含有する窒素雰囲気
中で、板温８００℃で、６０秒間の還元処理を行い、４
７０℃に冷却した後、浴温４７０℃のアルミニウムを
０．１３ｗｔ％含有する溶融亜鉛めっき浴に、約３秒間
浸漬し、溶融亜鉛めっきを行なった。その直後に、ガス
ワイパーで、付着量を片面で約６０ｇ／ｍ2 に調整した
後、板温５２０℃で３０秒間の合金化処理を行い、合金
化溶融亜鉛めっき鋼帯を製造した。Next, in a nitrogen atmosphere containing 7 vol% of hydrogen, a reduction treatment is performed at a plate temperature of 800 ° C. for 60 seconds, and
After cooling to 70 ° C., it was immersed in a hot-dip galvanizing bath containing 0.13 wt% of aluminum at a bath temperature of 470 ° C. for about 3 seconds to perform hot-dip galvanizing. Immediately after that, the adhesion amount was adjusted to about 60 g / m 2 on one side with a gas wiper, and an alloying treatment was performed at a plate temperature of 520 ° C. for 30 seconds to produce an alloyed hot-dip galvanized steel strip.
【００３７】上記条件にて、２４時間連続操業し、６時
間毎に、溶融亜鉛めっき鋼帯の任意の位置を４回サンプ
リングし、溶融めっき性（不めっき性、焼けむら）を下
記の試験法に準じて測定し、下記の基準に従って評価し
た。また加熱設備内をオンライン目視観察して、加熱帯
において鋼帯表面に形成された酸化物の密着性を、前述
の通り２段階評価した。評価結果もあわせて表２に示し
た。Under the above conditions, continuous operation was performed for 24 hours, and every six hours, an arbitrary position of the hot-dip galvanized steel strip was sampled four times, and the hot-dip galvanizability (non-plating property, uneven burning) was determined by the following test method. And measured according to the following criteria. Further, the inside of the heating equipment was visually observed online, and the adhesion of the oxide formed on the surface of the steel strip in the heating zone was evaluated in two steps as described above. The evaluation results are also shown in Table 2.
【００３８】（１）めっき外観 合金化溶融亜鉛めっき鋼帯のめっき表面を１０倍に拡大
して、不めっき面積率の測定と、焼けむら欠陥の有無を
観察し、３段階評価した。 ○＝不めっきあるいは焼けむら全くなし △＝少なくとも１回のサンプリングで、僅かに不めっき
あり、あるいは僅かに焼けむらあり（不めっきおよび焼
けむら面積率１％未満） ×＝少なくとも１回のサンプリングで、不めっきあり、
あるいは焼けむらあり（不めっきおよび焼けむら面積率
１％以上）(1) Appearance of Plating The plating surface of the alloyed hot-dip galvanized steel strip was magnified 10 times, the non-plating area ratio was measured, and the presence or absence of burn unevenness was observed. ＝= no plating or no unevenness in the color △ = slightly non-plated or slightly uneven in the burning with at least one sampling (non-plating and unevenness in the area of less than 1%) × = with at least one sampling , Unplated,
Or there is uneven burning (unplated and uneven burning area ratio 1% or more)
【００３９】[0039]
【表２】 [Table 2]
【００４０】（実施例３）図１に示す誘導加熱式加熱設
備を有する溶融めっき設備を用いて、加熱、還元、めっ
きの一連の処理を実施した。Ｓｉが０．５ｗｔ% 、Ｍｎ
が１．５ｗｔ% 、Ｃｒが０．０１ｗｔ% およびその他の
不可避的不純物を含む高強度鋼帯（厚さ０．７ｍｍ) を
陽極として、８０℃の５ｗｔ％水酸化ナトリウム水溶液
中で、電解脱脂を行い、水洗後、５０℃の１０ｗｔ％塩
酸水溶液中で１０秒間の浸漬酸洗浄を行い、水洗し、乾
燥した。前記処理を行なった鋼帯を、鋼帯搬送速度８０
ｍ／分で、かつ表３に示す条件で加熱処理した。Example 3 A series of heating, reduction, and plating processes were performed using a hot-dip plating facility having an induction heating type heating facility shown in FIG. Si is 0.5wt%, Mn
Using a high-strength steel strip (thickness 0.7 mm) containing 1.5 wt%, Cr 0.01 wt% and other unavoidable impurities as an anode, electrolytic degreasing is performed in a 5 wt% sodium hydroxide aqueous solution at 80 ° C. Then, after washing with water, immersion in a 10 wt% hydrochloric acid aqueous solution at 50 ° C. for 10 seconds was performed, followed by washing with water and drying. The steel strip that has been subjected to the above processing is transferred to a steel strip transport speed of 80.
Heat treatment was performed at m / min and under the conditions shown in Table 3.
【００４１】次に水素を７ｖｏｌ％含有する窒素雰囲気
中で、板温８８０℃で、６０秒間の還元処理を行い、４
４０℃に冷却した後、浴温４４０℃のアルミニウムを４
ｗｔ％含有する溶融亜鉛アルミニウムめっき浴に、約３
秒間浸漬し、溶融亜鉛アルミニウムめっきを行なった。
その直後に、ガスワイパーで、付着量を片面で約５０ｇ
／ｍ2 に調整して、溶融亜鉛アルミニウムめっき鋼帯を
製造した。Next, in a nitrogen atmosphere containing 7 vol% of hydrogen, a reduction treatment is performed at a plate temperature of 880 ° C. for 60 seconds, and
After cooling to 40 ° C, aluminum at a bath temperature of 440 ° C was
about 3% in a hot-dip galvanized aluminum plating bath containing
For 2 seconds, hot dip galvanized aluminum plating was performed.
Immediately afterwards, with a gas wiper, the attached amount is about 50 g on one side.
/ M 2 to produce a hot-dip galvanized aluminum strip.
【００４２】上記条件にて、２４時間連続操業し、６時
間毎に、溶融亜鉛アルミニウムめっき鋼帯の任意の位置
を４回サンプリングし、溶融めっき性（めっき外観、め
っき密着性）を実施例１に記載の試験法と基準に従って
評価した。また加熱設備内をオンライン目視観察して、
加熱帯において鋼帯表面に形成された酸化物の密着性を
評価した。評価結果もあわせて表３に示した。Under the above conditions, continuous operation was carried out for 24 hours, and an arbitrary position of the hot-dip galvanized aluminum strip was sampled four times every 6 hours, and the hot-dip plating property (plating appearance, plating adhesion) was measured in Example 1. The evaluation was carried out according to the test methods and criteria described in 1. Also, online observation of the inside of the heating equipment,
The adhesion of the oxide formed on the steel strip surface in the heating zone was evaluated. The evaluation results are also shown in Table 3.
【００４３】[0043]
【表３】 [Table 3]
【００４４】（実施例４）図１に示すオールラジアント
式加熱設備を有する溶融めっき設備を用い、加熱、還
元、めっきの一連の処理を実施した。Ｓｉが０．５ｗｔ
% 、Ｍｎが１．５ｗｔ% 、Ｃｒが０．０１ｗｔ% および
その他の不可避的不純物を含む高強度鋼帯（厚さ０．７
ｍｍ) を、８０℃の５ｗｔ％水酸化ナトリウム水溶液中
で、電解脱脂を行い、水洗後、５０℃の１０ｗｔ％塩酸
水溶液中で１０秒間の浸漬酸洗浄を行い、水洗し、乾燥
した。前記処理を行なった鋼帯を、鋼帯搬送速度８０ｍ
／分で、かつ表３に示す条件で加熱処理した。Example 4 A series of heating, reduction, and plating processes were performed using a hot-dip plating facility having an all-radiant heating facility shown in FIG. Si is 0.5wt
%, Mn 1.5 wt%, Cr 0.01 wt% and other high-strength steel strips containing other unavoidable impurities (thickness 0.7
mm) was subjected to electrolytic degreasing in a 5 wt% aqueous sodium hydroxide solution at 80 ° C., washed with water, immersed in an aqueous 10 wt% hydrochloric acid solution at 50 ° C. for 10 seconds, washed with water, and dried. The steel strip subjected to the above treatment is transported at a steel strip transport speed of 80 m.
/ Min and under the conditions shown in Table 3.
【００４５】次に水素を７ｖｏｌ％含有する窒素雰囲気
中で、板温８８０℃で、６０秒間の還元処理を行い、４
４０℃に冷却した後、浴温４４０℃のアルミニウムを４
５ｗｔ％含有する溶融亜鉛アルミニウムめっき浴に、約
３秒間浸漬し、溶融亜鉛アルミニウムめっきを行なっ
た。その直後に、ガスワイパーで、付着量を片面で約５
０ｇ／ｍ2 に調整して、溶融亜鉛アルミニウムめっき鋼
帯を製造した。Next, in a nitrogen atmosphere containing 7 vol% of hydrogen, a reduction treatment was performed at a plate temperature of 880 ° C. for 60 seconds, and
After cooling to 40 ° C, aluminum at a bath temperature of 440 ° C was
It was immersed in a galvanized aluminum plating bath containing 5 wt% for about 3 seconds to perform galvanized aluminum plating. Immediately afterwards, use a gas wiper to reduce the adhesion amount to about 5 on one side.
It was adjusted to 0 g / m 2 to produce a hot-dip galvanized aluminum strip.
【００４６】上記条件にて、２４時間連続操業し、６時
間毎に、溶融亜鉛アルミニウムめっき鋼帯の任意の位置
を４回サンプリングし、溶融めっき性（めっき外観、め
っき密着性）を実施例１に記載の試験法と基準に従って
評価した。また加熱設備内をオンライン目視観察して、
加熱帯において鋼帯表面に形成された酸化物の密着性を
評価した。評価結果もあわせて表４に示した。Under the above conditions, continuous operation was carried out for 24 hours, and an arbitrary position of the hot-dip galvanized aluminum strip was sampled four times every 6 hours, and the hot-dip plating property (plating appearance, plating adhesion) was measured in Example 1. The evaluation was carried out according to the test methods and criteria described in 1. Also, online observation of the inside of the heating equipment,
The adhesion of the oxide formed on the steel strip surface in the heating zone was evaluated. The evaluation results are also shown in Table 4.
【００４７】[0047]
【表４】 [Table 4]
【００４８】[0048]
【発明の効果】本発明により、溶融めっき性を改善で
き、安価でかつ安定して、めっき外観、めっき密着性、
酸化物密着性の良好な溶融めっき鋼板を製造することが
できる。According to the present invention, the hot-dip plating properties can be improved, and the plating appearance, plating adhesion,
A hot-dip coated steel sheet having good oxide adhesion can be manufactured.
【図１】 本発明の加熱設備を有する連続溶融めっき設
備の概略図である。FIG. 1 is a schematic diagram of a continuous hot-dip plating facility having a heating facility of the present invention.
１：鋼帯 ２：脱脂設備 ３：酸洗浄設備 ４：加熱帯 ５：仕切り壁 ６：還元帯 ７：排気口 ８：冷却設備 ９：ハースロール １０：めっき浴 １１：付着量調整装置 １２：合金化炉 １３：加熱設備 1: Steel strip 2: Degreasing equipment 3: Acid cleaning equipment 4: Heating zone 5: Partition wall 6: Reduction zone 7: Exhaust port 8: Cooling equipment 9: Hearth roll 10: Plating bath 11: Adhesion amount adjusting device 12: Alloy Furnace 13: Heating equipment
フロントページの続き Ｆターム(参考） 4K027 AA02 AA22 AA23 AB07 AB26 AC12 AD25 AD29 AE12 AE33 AE34 Continued on the front page F term (reference) 4K027 AA02 AA22 AA23 AB07 AB26 AC12 AD25 AD29 AE12 AE33 AE34
Claims (2)
いて、溶融めっき鋼板を製造するに際し、酸素を０．０
１〜５ｖｏｌ％含有し、残部が窒素からなり、かつ実質
的に水を含まない雰囲気中、６５０℃超の温度で、鋼板
を加熱処理した後、実質的に水を含まない還元性雰囲気
で還元処理してから、めっき浴に浸漬して溶融めっき処
理することを特徴とする溶融めっき鋼板の製造方法。When producing a hot-dip coated steel sheet using a continuous hot-dip plating equipment having a heating equipment, oxygen is added to the hot-dip coated steel sheet at a temperature of 0.01%.
After heat-treating a steel sheet at a temperature of more than 650 ° C. in an atmosphere containing 1 to 5 vol% and the balance being nitrogen and containing substantially no water, the steel sheet is reduced in a reducing atmosphere containing substantially no water. A method for producing a hot-dip coated steel sheet, wherein the hot-dip coated steel sheet is dipped in a plating bath and then hot-dip coated.
り２μｍ以下の厚さの鉄系酸化物層を形成することを特
徴とする請求項１に記載の溶融めっき鋼板の製造方法。2. The method according to claim 1, wherein an iron-based oxide layer having a thickness of 2 μm or less per side is formed on the surface of the steel sheet by the heat treatment.
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|---|---|---|---|
| JP10039999A JP2000290762A (en) | 1999-04-07 | 1999-04-07 | Production of hot dip metal coated steel sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10039999A JP2000290762A (en) | 1999-04-07 | 1999-04-07 | Production of hot dip metal coated steel sheet |
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