JPH10225778A - Titanium clad steel plate superior in workability - Google Patents
Titanium clad steel plate superior in workabilityInfo
- Publication number
- JPH10225778A JPH10225778A JP2998997A JP2998997A JPH10225778A JP H10225778 A JPH10225778 A JP H10225778A JP 2998997 A JP2998997 A JP 2998997A JP 2998997 A JP2998997 A JP 2998997A JP H10225778 A JPH10225778 A JP H10225778A
- Authority
- JP
- Japan
- Prior art keywords
- titanium
- base material
- clad steel
- crystal grain
- steel
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はチタンクラッド鋼
板、特に、曲げ加工性に優れた板厚の薄いチタンクラッ
ド鋼板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a titanium clad steel sheet, and more particularly to a thin titanium clad steel sheet having excellent bending workability.
【０００２】[0002]
【従来の技術】チタンはその優れた耐食性から防食材料
として最適なものの一つであるが高価なため、近年、鋼
（母材と呼ばれる）とチタン（合わせ材と呼ばれる）を
組み合わせて低コスト化したチタンクラッド鋼板が開発
され、腐食環境の厳しい海洋構造物、化学プラント、発
電プラントなどの分野でその需要が増している。2. Description of the Related Art Titanium is one of the most suitable anticorrosion materials due to its excellent corrosion resistance, but it is expensive. In recent years, titanium (called a base material) and titanium (called a composite material) have been combined to reduce costs. Titanium-clad steel sheets have been developed and their demand is increasing in fields such as marine structures, chemical plants, and power plants that are in a severely corrosive environment.
【０００３】クラッド鋼板の製造方法としては、溶鋼レ
ベルで行う鋳込み法と爆着法及び圧延法に代表される固
相接合法が一般的である。しかし、チタンクラッド鋼板
の場合には、鋼とチタンの界面にＦｅーＴｉ系金属間化
合物や炭化物（ＴｉＣ）などの脆弱層が形成されて容易
に界面剥離が生じることから鋳込み法を用いることはで
きず、固相接合法が採用されている。[0003] As a method for producing a clad steel sheet, a casting method performed at a molten steel level, a solid-state joining method represented by a bombardment method and a rolling method are generally used. However, in the case of a titanium clad steel sheet, a brittle layer such as an Fe-Ti intermetallic compound or a carbide (TiC) is formed at the interface between the steel and titanium, and the interface is easily peeled off. No, the solid-state joining method has been adopted.
【０００４】固相接合法のうち爆着法は、金属間化合物
や炭化物等の脆弱層が生じることがなく接合強度に対す
る信頼性が高いため、現在広く採用されているが、生産
性が低く製造コストが高い上に、板厚の薄いものが製造
できないという欠点がある。[0004] Among the solid-state joining methods, the explosion method is widely used at present because it has high reliability in joining strength without forming a brittle layer such as an intermetallic compound or a carbide. In addition to the high cost, there is a drawback that a thin plate cannot be manufactured.
【０００５】一方、固相接合法であるいま一つの圧延
法、特に熱間圧延による拡散接合を利用した圧延法は生
産性が高く、板厚も比較的自由に変えられるため爆着法
に比べて有利な方法である。しかしながら、接合界面に
金属間化合物等の脆弱層が生成する可能性が高く、接合
強度の信頼性は爆着法に比べて低いとされている。On the other hand, another rolling method which is a solid-phase bonding method, particularly a rolling method utilizing diffusion bonding by hot rolling, has high productivity and the thickness of the sheet can be changed relatively freely, so that it is compared with the explosion method. This is an advantageous method. However, there is a high possibility that a brittle layer such as an intermetallic compound is generated at the bonding interface, and the reliability of the bonding strength is said to be lower than that of the explosion method.
【０００６】こうした圧延法における界面での金属間化
合物等の生成を抑え、接合強度を改善する技術は従来か
ら多数提案されている。例えば、特開昭６２ー６７８３
号公報ではスラブ加熱温度を最適化する方法が、特開昭
５５ー４８４６８号公報、特開昭５７ー１０９５８８号
公報、特開昭５７ー１１２９８５号公報、特開昭５７ー
１９２２５６号公報では、鉄、ニッケル、銅などの板ま
たは箔を中間媒接材として挿入して圧延する方法が提案
されている。[0006] Many techniques have been proposed for suppressing the formation of intermetallic compounds and the like at the interface in such a rolling method and improving the bonding strength. For example, JP-A-62-26783
Japanese Patent Application Laid-Open No. 55-48468, Japanese Patent Application Laid-Open No. Sho 57-109588, Japanese Patent Application Laid-Open No. Sho 57-112285, and Japanese Patent Application Laid-Open No. Sho 57-192256 disclose a method of optimizing a slab heating temperature. There has been proposed a method of rolling by inserting a plate or foil of iron, nickel, copper, or the like as an intermediate contact material.
【０００７】これらの方法はいずれも加工性のほとんど
要求されない板厚の厚いチタンクラッド鋼板を対象とし
たものであるが、最近では、建材、自動車部品、家電製
品などの分野で板厚の薄いチタンクラッド鋼板を適用し
ようという動きがある。したがって、板厚の薄いチタン
クラッド鋼板に対しては、寸法精度( スプリングバッ
ク) などの観点から少なくとも限界曲げ半径が０．５ｔ
（ｔは板厚）以下の曲げ加工性を具備させる必要があ
る。[0007] All of these methods are intended for a thick titanium clad steel sheet, which hardly requires workability. Recently, however, thin titanium clad steel sheets have been used in the fields of building materials, automobile parts, home electric appliances and the like. There is a movement to apply clad steel sheets. Therefore, for a thin titanium clad steel sheet, at least the critical bending radius is 0.5t from the viewpoint of dimensional accuracy (spring back).
(T is a plate thickness).
【０００８】板厚の薄いチタンクラッド鋼板の製造方法
としては、例えば、特開昭６３ー１４４８８１号公報や
特開平１ー１２２６７７号公報には、銅の中間媒接材を
用いて、また特許第２５４６５８９号公報、特開平８ー
１４１７５４号公報、特開平８ー２７６２８３号公報な
どには熱延条件を最適化して接合性に優れた板厚の薄い
チタンクラッド鋼板の製造方法が開示されている。[0008] As a method for producing a titanium-clad steel sheet having a small thickness, for example, Japanese Patent Application Laid-Open Nos. 63-148881 and 1-122677 disclose the use of an intermediate contact material of copper. JP-A-2546589, JP-A-8-141754, JP-A-8-276283 and the like disclose a method of manufacturing a thin titanium-clad steel sheet having excellent joining properties by optimizing hot rolling conditions.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、本発明
者等が上記特許公報に記載された板厚の薄いチタンクラ
ッド鋼板の製造方法を検討したところ、加工性、特に曲
げ性に関してはその限界曲げ半径が温間曲げ加工を施し
ても高々１ｔ（ｔは板厚）程度で、建材、自動車部品、
家電製品などに適用する場合に必要な０．５ｔ以下の限
界曲げ半径が得られなかった。However, the present inventors have studied the method of manufacturing a thin titanium-clad steel sheet described in the above-mentioned patent gazette. Is at most about 1t (t is the plate thickness) even when subjected to warm bending.
A critical bending radius of 0.5 t or less required for application to home electric appliances or the like could not be obtained.
【００１０】本発明はこのような課題を解決するために
なされたもので、０．５ｔ以下の限界曲げ半径を有する
板厚の薄いチタンクラッド鋼板を提供することを目的と
する。The present invention has been made to solve such a problem, and an object of the present invention is to provide a thin titanium clad steel sheet having a critical bending radius of 0.5 t or less.
【００１１】[0011]
【課題を解決するための手段】上記課題は、母材の鋼に
合わせ材のチタンまたはチタン合金が中間媒接材を介さ
ずに接合されたチタンクラッド鋼板において、下記の条
件を満足することを特徴とする加工性に優れたチタンク
ラッド鋼板により解決される。SUMMARY OF THE INVENTION The object of the present invention is to provide a titanium clad steel sheet in which a base material steel and a matching material, titanium or a titanium alloy, are joined without using an intermediate material, and satisfy the following conditions. The problem is solved by a titanium clad steel sheet with excellent workability.
【００１２】（イ）前記鋼のＣ量が０．０１ｗｔ％以下
である。 （ロ）前記チタンクラッド鋼板の任意の断面を観察し、
前記母材と前記合わせ材の接合界面に形成される前記母
材と前記合わせ材の構成元素が混在している拡散層に前
記母材の鋼の任意の結晶粒界が交わる点ｉから前記拡散
層に前記合わせ材のチタンまたはチタン合金の結晶粒界
が交わる点までの距離のうち最小の距離をｄi （Ｆｅ）
μｍとし、ｎ個の結晶粒界についてｄi （Ｆｅ）を求め
たとき、５≦ｄav（Ｆｅ）＝（Σｄi （Ｆｅ））／ｎ≦
６０μｍである。 （ハ）前記拡散層に前記合わせ材のチタンまたはチタン
合金の任意の結晶粒界が交わる点ｉから前記拡散層に前
記母材の鋼の結晶粒界が交わる点までの距離のうち最小
の距離をｄi （Ｔｉ）μｍとし、ｎ個の結晶粒界につい
てｄi （Ｔｉ）を求めたとき、５≦ｄav（Ｔｉ）＝（Σ
ｄi （Ｔｉ））／ｎ≦６０μｍである。(A) The C content of the steel is 0.01 wt% or less. (B) observing any cross section of the titanium clad steel sheet,
From the point i at which an arbitrary crystal grain boundary of steel of the base material intersects with a diffusion layer formed at the bonding interface between the base material and the base material and in which the constituent elements of the base material are mixed, The minimum distance among the distances to the point where the crystal grain boundary of the titanium or titanium alloy of the bonding material intersects the layer is d i (Fe)
and [mu] m, when seeking d i (Fe) for n grain boundaries, 5 ≦ d av (Fe) = (Σd i (Fe)) / n ≦
60 μm. (C) the minimum distance among the distances from the point i at which the titanium or titanium alloy of the bonding material intersects the crystal grain boundary of the base material steel to the diffusion layer. Is d i (Ti) μm, and when d i (Ti) is obtained for n crystal grain boundaries, 5 ≦ d av (Ti) = (Σ
d i (Ti)) / n ≦ 60 μm.
【００１３】ここでｄi （Ｆｅ）の測定は、具体的には
以下のようにして行う。図２に、ｄi （Ｆｅ）の測定法
を示す。Here, the measurement of d i (Fe) is specifically performed as follows. FIG. 2 shows a method for measuring d i (Fe).
【００１４】最初に、チタンクラッド鋼板の任意の断面
を研磨後エッチングし、光学顕微鏡で観察する。First, an arbitrary cross section of a titanium clad steel plate is polished, etched and observed with an optical microscope.
【００１５】次に、鋼のある結晶粒界に注目し、その結
晶粒界が母材と合わせ材の接合界面に形成される拡散層
と交わる点をｉとする。そして、点ｉの周辺にある複数
のチタンの結晶粒界に注目し、それらの結晶粒界が拡散
層と交わる点のうち点ｉに一番近い点を決定する。この
点と点ｉを直線で結んだときの長さ（以後、最近接結晶
粒界間距離と呼ぶ）を測定すればｄi （Ｆｅ）が求ま
る。Next, paying attention to a certain grain boundary of steel, let i be a point where the grain boundary intersects a diffusion layer formed at a joint interface between the base material and the composite material. Then, attention is paid to the crystal grain boundaries of the plurality of titanium around the point i, and the point closest to the point i is determined among the points where the crystal grain boundaries intersect with the diffusion layer. Length (hereinafter, recently referred to as contact grain boundary distance) when connecting this point and the point i by a straight line d i (Fe) is obtained by measuring the.
【００１６】同様なことを合わせ材のチタンでも行え
ば、ｄi （Ｔｉ）が求まる。このような操作をｎ個の鋼
の結晶粒界について行えば、平均最近接結晶粒界間距離
ｄav（Ｆｅ）＝（Σｄi （Ｆｅ））／ｎが求まる。If the same operation is performed for titanium as a bonding material, d i (Ti) can be obtained. By performing such an operation for the crystal grain boundaries of n steel, the average nearest neighbor grain boundary distance d av (Fe) = (Σd i (Fe)) / n is determined.
【００１７】ｎ個の結晶粒界は、図２のようにｉ＋１、
ｉ＋２、ｉ＋３・・・・と連続的に選択してもよいし、
ランダムに選択してもよい。また、曲げ性との相関を調
べるには、ｎが２０以上であることが望ましい。As shown in FIG. 2, the n grain boundaries are i + 1,
i + 2, i + 3... may be selected continuously,
It may be selected at random. In order to examine the correlation with the bending property, it is desirable that n is 20 or more.
【００１８】本発明者等が検討した範囲では、中間媒接
材を用いると０．５ｔ以下の限界曲げ半径を有するチタ
ンクラッド鋼板が得られなかった。これは、母材／合わ
せ材界面に母材と異なる強度の脆弱層や金属間化合物が
形成されるためである。In the range studied by the present inventors, a titanium clad steel sheet having a critical bending radius of 0.5 t or less could not be obtained using an intermediate contact material. This is because a brittle layer or an intermetallic compound having a strength different from that of the base material is formed at the base material / laminated material interface.
【００１９】また、母材の鋼のＣ量が０．０１ｗｔ％を
超えると０．５ｔ以下の限界曲げ半径が得られなかっ
た。ＴｉＣが多量に生成し、それを起点にクラックが発
生し易くなるためである。When the C content of the base steel exceeds 0.01 wt%, a critical bending radius of 0.5 t or less could not be obtained. This is because a large amount of TiC is generated, and cracks tend to be generated from the TiC.
【００２０】こうした条件を満足させても、母材と合わ
せ材の界面近傍の組織を適正化しないと、曲げ加工時に
クラックが発生する。Even if these conditions are satisfied, cracks will occur during bending unless the structure near the interface between the base material and the composite material is optimized.
【００２１】本発明者等が、表１に示す主な成分を有す
る鋼を母材に、純チタンを合わせ材に用い、加熱温度、
仕上温度、仕上圧延の全圧下率、巻取温度などの熱間圧
延条件を変えて母材および合わせ材の組織を意識的に変
化させて、１８０°Ｕ曲げ試験（剪断縁、曲げ方向Ｌ）
をチタン面を表にして曲げ半径０．５ｔで行い、クラッ
クの発生状況を調査したところ、クラックの発生は母材
と合わせ材の界面近傍の結晶粒径よりむしろ母材と合わ
せ材の界面における結晶粒の重なり方（相互の結晶粒界
間距離）に大きく依存し、上記した平均最近接結晶粒界
間距離ｄav（Ｆｅ）、ｄav（Ｔｉ）と密接な関係にある
ことを見出した。The present inventors used steel having the main components shown in Table 1 as a base metal and pure titanium as a composite material,
180 ° U bending test (shear edge, bending direction L) by intentionally changing the structure of the base material and the laminated material by changing the hot rolling conditions such as the finishing temperature, the total rolling reduction of the finish rolling, and the winding temperature.
Was conducted at a bending radius of 0.5 t with the titanium surface facing up, and the state of occurrence of cracks was investigated. The occurrence of cracks was found at the interface between the base material and the composite material rather than at the crystal grain size near the interface between the base material and the composite material. It has been found that the average distance between the crystal grains greatly depends on the overlapping manner of the crystal grains (distance between the crystal grain boundaries) and is closely related to the above-mentioned average distances between the nearest crystal grain boundaries d av (Fe) and d av (Ti). .
【００２２】図１に、０．５ｔ曲げ時のクラックの発生
の有無とｄav（Ｆｅ）、ｄav（Ｔｉ）との関係を示す。FIG. 1 shows the relationship between the presence or absence of cracks at the time of 0.5t bending and d av (Fe) and d av (Ti).
【００２３】５≦ｄav（Ｆｅ）≦６０μm 、かつ５≦ｄ
av（Ｔｉ）≦６０μm であれば、クラックが発生しない
ことがわかる。5 ≦ d av (Fe) ≦ 60 μm and 5 ≦ d
If av (Ti) ≦ 60 μm, it can be seen that no crack occurs.
【００２４】[0024]
【表１】 [Table 1]
【００２５】これは、曲げ変形時に、母材または合わせ
材の結晶粒界に働く応力が母材、合わせ材単独で変形に
寄与するのではなく、拡散層を挟んだ他方の最近接結晶
粒界との応力分布のバランスによって曲げ変形に寄与す
るためと考えられる。すなわち、次のようなメカニズム
によりクラックの発生が左右されると考えられる。[0025] This is because the stress acting on the crystal grain boundary of the base material or the composite material during bending deformation does not contribute to the deformation by the base material or the composite material alone, but the other nearest crystal grain boundary sandwiching the diffusion layer. This is considered to contribute to bending deformation by the balance of the stress distribution with the above. That is, it is considered that the occurrence of cracks is affected by the following mechanism.
【００２６】最近接結晶粒界間距離が短いと、結晶粒界
に働く応力と拡散層を挟んだ他方の最近接結晶粒界に働
く応力とが互いに増幅し、結晶粒界間の応力集中が増大
してクラックが発生する。一方、最近接結晶粒界間距離
が長いと、曲げ加工時に拡散層を挟んだ他方の最近接結
晶粒界との間ではなく、クラックの伝播速度が速い母材
と拡散層あるいは合わせ材と拡散層の界面で割れが生じ
やすくなる。これに対し、結晶粒界間距離が適正範囲内
では、拡散層を挟んだ相互の最近接結晶粒界に働く応力
分布が最近接結晶粒界間で増幅することがないためにこ
のような問題が生じない。When the distance between the nearest crystal grain boundaries is short, the stress acting on the crystal grain boundaries and the stress acting on the other nearest crystal grain boundary sandwiching the diffusion layer are mutually amplified, and the stress concentration between the crystal grain boundaries is reduced. Cracks occur due to increase. On the other hand, if the distance between the nearest crystal grain boundaries is long, the diffusion speed between the base material and the diffusion layer or the composite material, which is high in the propagation speed of cracks, will not be between the nearest crystal grain boundary that sandwiches the diffusion layer during bending and the other material. Cracks tend to occur at the interface of the layers. On the other hand, when the distance between crystal grain boundaries is within an appropriate range, the stress distribution acting on the mutually closest crystal grain boundaries sandwiching the diffusion layer does not amplify between the closest crystal grain boundaries. Does not occur.
【００２７】[0027]
【発明の実施の形態】本発明のポイントは、チタンクラ
ッド鋼板の曲げ性改善のために母材と合わせ材の接合界
面における平均最近接結晶粒界間距離を適正化すること
であり、その適正化が図られている限り製造条件は限定
されない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The point of the present invention is to optimize the average closest crystal grain boundary distance at the joint interface between a base material and a composite material in order to improve the bendability of a titanium clad steel sheet. The production conditions are not limited as long as the production is achieved.
【００２８】ｄav（Ｆｅ）やｄav（Ｔｉ）の平均最近接
結晶粒界間距離を本発明範囲内にするには、例えば、後
述の実施例に示されるように、既存の薄鋼板用熱間圧延
プロセスを用い、仕上温度、仕上圧延における合計圧下
率、巻取温度をコントロールして、鋼とチタンの再結晶
や粒成長を最適化することによって行える。In order to make the average inter-granular distance between d av (Fe) and d av (Ti) within the range of the present invention, for example, as shown in the examples described later, existing thin steel sheet This can be achieved by optimizing the recrystallization and grain growth of steel and titanium by using a hot rolling process and controlling the finishing temperature, the total rolling reduction in finish rolling, and the winding temperature.
【００２９】母材としてＣ量を０．００５ｗｔ％以下に
した鋼やＴｉやＮｂなどを添加したインタースティシャ
ルフリー鋼を用いると、接合界面におけるＴｉＣの形成
をほぼ完全に抑制できるので、より優れた曲げ加工性が
得られる。When a steel having a C content of 0.005 wt% or less or an interstitial-free steel to which Ti or Nb is added is used as a base material, the formation of TiC at the joining interface can be almost completely suppressed, so that a more excellent result is obtained. Bending workability is obtained.
【００３０】合わせ材としてチタン合金を用いるとき
は、曲げ性の劣化を招く場合があるので、合金元素量の
総量が１０ｗｔ％以下の合金を用いることが望ましい。When a titanium alloy is used as the bonding material, the bending property may be deteriorated. Therefore, it is preferable to use an alloy having a total amount of alloy elements of 10 wt% or less.
【００３１】[0031]
【実施例】表１に示す主な成分を有するａ〜ｈの鋼を母
材に、純チタン（ＪＩＳ 第１種相当）を合わせ材に用
いて、全板厚４ｍｍ（合わせ材１ｍｍ＋母材３ｍｍ）の
チタンクラッド鋼板を次の条件で作成した。なお、鋼の
主成分以外の残部は、Ｆｅと不可避的不純物からなって
いる。[Examples] A total thickness of 4 mm (1 mm of a joint material + 3 mm of a base material) was obtained using a steel of a to h having main components shown in Table 1 as a base material and pure titanium (equivalent to JIS Class 1) as a base material. ) Was produced under the following conditions. The balance other than the main component of steel is composed of Fe and inevitable impurities.
【００３２】母材および合わせ材の接合すべき面をグラ
インダーで研磨し、表面粗さＲａを５．５〜６．３μｍ
に調整後、母材と合わせ材を重ね、合わせ材の上にＡｌ
2 Ｏ 3 の剥離材を介して母材と同じ鋼の犠牲材を重ね、
６×１０-4Ｔｏｒｒの真空中で電子ビーム溶接してセミ
サンドイッチ方式のスラブを組み立てた。このスラブを
表２に示す熱延条件で熱間圧延し、犠牲材を剥離して試
料Ｎｏ．１〜８のチタンクラッド鋼板を作成した。The surfaces to be joined of the base material and the laminated material are
Polished with an inder, surface roughness Ra of 5.5 to 6.3 μm
After the adjustment, the base material and the composite material are overlapped, and Al is placed on the composite material.
TwoO ThreeOverlapping sacrificial material of the same steel as the base material through the release material of
6 × 10-FourElectron beam welding in Torr vacuum
The sandwich slab was assembled. This slab
Hot rolling was performed under the hot rolling conditions shown in Table 2, and the sacrificial material was peeled off and tested.
Charge No. 1 to 8 titanium clad steel sheets were prepared.
【００３３】そして、１８０°Ｕ曲げ試験（剪断縁、曲
げ方向Ｌ）をチタン面を表にして曲げ半径０．５ｔで行
い、割れの有無を調査した。Then, a 180 ° U bending test (shear edge, bending direction L) was performed with a bending radius of 0.5 t with the titanium surface facing up, and the presence or absence of cracks was examined.
【００３４】結果を表２に示す。平均最近接結晶粒界間
距離ｄav（Ｆｅ）、ｄav（Ｔｉ）が本発明範囲内にある
試料Ｎｏ．１〜３は、０．５ｔ曲げでも割れが発生して
おらず、優れた曲げ加工性を有していることがわかる。Table 2 shows the results. Sample No. 1 in which the average closest grain boundary distances d av (Fe) and d av (Ti) were within the range of the present invention. Nos. 1 to 3 show no cracks even when bent by 0.5 t, indicating that they have excellent bending workability.
【００３５】一方、試料Ｎｏ．４、試料Ｎｏ．５、試料
Ｎｏ．６〜７は、それぞれ試料Ｎｏ．１、試料Ｎｏ．
２、試料Ｎｏ．３と母材、合わせ材の結晶粒径が同じで
あるが、平均最近接結晶粒界間距離が本発明範囲内にな
いので、０．５ｔ曲げで割れが発生している。この結果
より、上記した「チタンクラッド鋼板の曲げ性が結晶粒
径よりむしろ平均最近接結晶粒界間距離に支配される」
ということが確認できる。On the other hand, the sample No. 4, sample no. 5, sample no. Sample Nos. 6 and 7 are sample Nos. 1, sample no.
2, Sample No. Although the crystal grain diameters of the base material and the composite material were the same as those of No. 3, but the average distance between the closest crystal grain boundaries was not within the range of the present invention, cracks were generated by 0.5t bending. From this result, the above-mentioned "the bendability of the titanium clad steel sheet is governed by the average distance between the nearest crystal grain boundaries rather than the crystal grain size"
It can be confirmed that.
【００３６】母材の鋼のＣ量が本発明範囲を超えている
試料Ｎｏ．８は、０．５ｔ曲げで割れが発生している。
この試料の界面にはＴｉＣが多量に認められた。Sample No. 1 in which the C content of the base steel exceeded the range of the present invention. In No. 8, a crack was generated by 0.5t bending.
A large amount of TiC was observed at the interface of this sample.
【００３７】[0037]
【表２】 [Table 2]
【００３８】[0038]
【発明の効果】本発明は以上説明したように構成されて
いるので、０．５ｔ以下の限界曲げ半径を有する板厚の
薄いチタンクラッド鋼板を提供できる。According to the present invention, as described above, a thin titanium clad steel sheet having a critical bending radius of 0.5t or less can be provided.
【００３９】本発明のチタンクラッド鋼板は、このよう
に板厚が薄くて、加工性に優れているので建材、自動車
部品、家電部品等にも適用でき、その耐食性を安価に著
しく改善できるので、その産業上の効果は多大である。The titanium clad steel sheet of the present invention has such a small thickness and excellent workability, so that it can be applied to building materials, automobile parts, home electric parts and the like, and its corrosion resistance can be remarkably improved at low cost. The industrial effects are enormous.
【図１】０．５ｔ曲げ時のクラックの発生の有無とｄav
（Ｆｅ）、ｄav（Ｔｉ）との関係を示す図である。FIG. 1 shows the occurrence of cracks and d av during 0.5t bending.
It is a figure which shows the relationship with (Fe) and dav (Ti).
【図２】ｄi （Ｆｅ）の測定法を示す図である。FIG. 2 is a diagram showing a method for measuring d i (Fe).
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高野 俊夫 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 崎山 哲雄 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 松野 隆 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Takano 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Tetsuo Sakiyama 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan (72) Inventor Takashi Matsuno 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd.
Claims (1)
ン合金が中間媒接材を介さずに接合されたチタンクラッ
ド鋼板において、下記の条件を満足することを特徴とす
る加工性に優れたチタンクラッド鋼板。 （イ）前記鋼のＣ量が０．０１ｗｔ％以下である。 （ロ）前記チタンクラッド鋼板の任意の断面を観察し、
前記母材と前記合わせ材の接合界面に形成される前記母
材と前記合わせ材の構成元素が混在している拡散層に前
記母材の鋼の任意の結晶粒界が交わる点ｉから前記拡散
層に前記合わせ材のチタンまたはチタン合金の結晶粒界
が交わる点までの距離のうち最小の距離をｄi （Ｆｅ）
μｍとし、ｎ個の結晶粒界についてｄi （Ｆｅ）を求め
たとき、５≦ｄav（Ｆｅ）＝（Σｄi （Ｆｅ））／ｎ≦
６０μｍである。 （ハ）前記拡散層に前記合わせ材のチタンまたはチタン
合金の任意の結晶粒界が交わる点ｉから前記拡散層に前
記母材の鋼の結晶粒界が交わる点までの距離のうち最小
の距離をｄi （Ｔｉ）μｍとし、ｎ個の結晶粒界につい
てｄi （Ｔｉ）を求めたとき、５≦ｄav（Ｔｉ）＝（Σ
ｄi （Ｔｉ））／ｎ≦６０μｍである。1. A titanium clad steel sheet in which a base material steel and a matching material, titanium or a titanium alloy, are joined without an intermediary intermediate material, and satisfy the following conditions, and have excellent workability. Titanium clad steel sheet. (A) The steel has a C content of 0.01 wt% or less. (B) observing any cross section of the titanium clad steel sheet,
From the point i at which an arbitrary crystal grain boundary of steel of the base material intersects with a diffusion layer formed at the bonding interface between the base material and the base material and in which the constituent elements of the base material are mixed, The minimum distance among the distances to the point where the crystal grain boundary of the titanium or titanium alloy of the bonding material intersects the layer is d i (Fe)
and [mu] m, when seeking d i (Fe) for n grain boundaries, 5 ≦ d av (Fe) = (Σd i (Fe)) / n ≦
60 μm. (C) the minimum distance among the distances from the point i at which the titanium or titanium alloy of the bonding material intersects the crystal grain boundary of the base material steel to the diffusion layer. Is d i (Ti) μm, and when d i (Ti) is obtained for n crystal grain boundaries, 5 ≦ d av (Ti) = (Σ
d i (Ti)) / n ≦ 60 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2998997A JPH10225778A (en) | 1997-02-14 | 1997-02-14 | Titanium clad steel plate superior in workability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2998997A JPH10225778A (en) | 1997-02-14 | 1997-02-14 | Titanium clad steel plate superior in workability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10225778A true JPH10225778A (en) | 1998-08-25 |
Family
ID=12291373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2998997A Pending JPH10225778A (en) | 1997-02-14 | 1997-02-14 | Titanium clad steel plate superior in workability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10225778A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6716554B2 (en) | 1999-04-08 | 2004-04-06 | Quallion Llc | Battery case, cover, and feedthrough |
| DE102009038650A1 (en) * | 2009-08-13 | 2011-02-24 | Eurolaser Gmbh | Upper extraction unit removing gaseous emissions from laser machining equipment, has suction hood formed by upper and lower casings held together by magnets and locking screws |
-
1997
- 1997-02-14 JP JP2998997A patent/JPH10225778A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6716554B2 (en) | 1999-04-08 | 2004-04-06 | Quallion Llc | Battery case, cover, and feedthrough |
| DE102009038650A1 (en) * | 2009-08-13 | 2011-02-24 | Eurolaser Gmbh | Upper extraction unit removing gaseous emissions from laser machining equipment, has suction hood formed by upper and lower casings held together by magnets and locking screws |
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