JPS60261682A - Titanium clad steel material and its production - Google Patents

Abstract

PURPOSE:To provide high joint strength to a titanium clad steel material by constituting the metallic intermediate layer of said material of two layers; a nickel layer disposed on the base metal side and a molybdenum layer disposed on the titanium material side. CONSTITUTION:The titanium clad steel material consists of a titanium material 11, a steel plate 12 and the intermediate metallic layer which is provided between the opposed surfaces thereof and is formed by disposing respectively the molybdenum layer 13 of a thin film on the titanium material 11 side and the nickel layer 14 of a thin film on the plate 12 side and rolling and joining these layers. The titanium clad steel material having the excellent joint strength is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a titanium clad steel material consisting of a steel material as a base material and a titanium material as a laminate material, and a method for manufacturing the same.

(Prior art) So-called clad materials, which are made by laminating and integrating dissimilar metals in layers, have properties that cannot be obtained with individual metals, combine the excellent characteristics of each material, and compensate for the shortcomings of each material. It is widely used because it is inexpensive. Among these, titanium-steel clad materials are technically and economically important from the viewpoints of making use of titanium's excellent corrosion resistance, and reducing manufacturing costs by reducing the amount of titanium used by cladding. .

(Problems to be Solved by the Invention) Among various methods for producing titanium-steel clad materials, that is, titanium clad steel materials, particularly titanium clad steel materials,
In a method called a rolling method or an explosion rolling method, a method has been proposed in which various metal intermediate layers are arranged between a base material and a laminate material to join them. however,
There is a problem that a brittle intermetallic compound is formed in the metal intermediate layer interposed between the titanium material and the steel material, and this causes material deterioration of the titanium clad steel.
The method of using copper alone as the metal intermediate layer has problems such as wetting of the base steel and copper and deterioration of the base steel due to diffusion of copper into the base steel. Another problem is that hydrogen and oxygen from the surrounding environment react with the titanium material as a bonding material, resulting in material deterioration.

(Object of the Invention) Therefore, an object of the present invention is to provide a titanium clad steel material, particularly a titanium clad steel plate, and a method for manufacturing the same, which solve the problems of the conventional method described above and have low bonding strength.

(Structure of the Invention) Here, the gist of the present invention is that a steel material is used as a base material, a titanium material as a laminate material, and a metal intermediate layer rolled and joined between opposing surfaces of these two materials. This is a titanium clad steel material characterized in that the metal intermediate layer is composed of two layers: a nickel layer placed on the base metal side and a molybdenum layer placed on the titanium H side.

Further, in the present invention, a metal intermediate layer is sandwiched and bonded between a steel material as a base material and a titanium material as a mating material to form a clad assembly material, and a release agent is applied to the two clad assembly materials so that the titanium material side faces each other. A sandwich-like cladding assembly is formed by combining the steel materials with the two sides interposed and sealing the entire periphery of the steel materials on both sides, and after performing exhaust treatment on the internal cavity of the assembly, the resulting evacuated assembly is The metal intermediate layer is composed of two layers: a nickel layer placed on the base material side and a molybdenum layer placed on the titanium material side, and the hot rolling is applied to This is a method for manufacturing titanium clad steel material, characterized in that it is carried out at a temperature range of .degree.

In the present invention, in order to sandwich and join the metal intermediate layer between the base material and the laminate material, it is preferable to perform this by explosive bonding. However, other conventional methods can also be used, such as partial brazing or spot welding.

As described above, the present invention is characterized by using molybdenum and nickel as a metal intermediate layer between the base material and the composite material. Using nickel as the metal interlayer,
Furthermore, this is based on the new finding that the bondability between titanium and steel is improved by hot rolling in a temperature range of 650 to 1000°C.

In this way, in the present invention, the molybdenum layer and the nickel layer are used as the intermediate metal layer, but in that case, the molybdenum layer is placed on the titanium material side, so that the metal intermediate layer is Improves wettability and enables strong bonding. On the other hand, by placing the nickel layer on the base material side, it improves the wettability of the metal intermediate layer to the base material and creates a strong bond. It also acts as a barrier layer against the diffusion of base material carbon into molybdenum, and the interface Prevents deterioration caused by molybdenum carbide.

Here, the nickel layer includes not only pure nickel but also general nickel alloys as long as they are effective in improving wettability and preventing carbide formation.

Similarly, the molybdenum layer includes not only pure molybdenum but also general molybdenum alloys as long as they are effective in improving wettability.

Note that the metal intermediate layer may be in the form of a thin plate, a foil, or a film, and is preferably as thin as possible.

The composition and shape of the titanium material used as a base material and as a composite material in the present invention are not particularly limited, and may be, for example, those used in conventional titanium clad steel materials.

As already mentioned, in the method of the present invention, the base material,
Clad assembly materials consisting of a metal intermediate layer and a cladding material are assembled so that the cladding materials (i.e., titanium) are facing each other,
Generally, they are assembled using a release agent, and then the entire periphery of the steel members on both sides of the assembly material is sealed to exhaust air from the internal void. This prevents the formation of titanium nitrides and oxides at the joint surface between titanium and steel during heating and rolling, and also prevents gas absorption from the surrounding atmosphere into the titanium material. Since there is no need to take into account the deterioration of the titanium material, it has the advantage of being able to be hot rolled under the same conditions as the heating and rolling atmosphere for ordinary steel materials.

In the present invention, the rolling temperature is limited to a temperature range of 650°C to 1000°C. The reason for this is that rolling becomes redundant at temperatures below 650°C, while rolling at temperatures above 1000°C causes breakage of the molybdenum layer in the middle layer, which has poor hot workability, and causes the nickel layer and titanium material to separate. This is because a titanium-nickel alloy layer is formed between the two, and this alloy layer may melt, which is undesirable (the melting point of the titanium-nickel alloy layer is about 1000° C.).

Therefore, the rolling temperature is in the range of 650 to 1000°C, preferably 750 to 900°C. The hot rolling method may be any conventional method, and the present invention is not particularly limited thereto.

The invention will now be described in more detail with reference to the accompanying drawings, the examples of which are shown for purposes of illustration only, and in which:
The present invention is not particularly limited to this.

FIG. 1 is a schematic cross-sectional view showing a titanium clad steel material of the present invention. In the figure, numeral 11 is a titanium material as a laminating material;
Reference numeral 12 indicates a steel plate as a base material, 13 indicates a molybdenum layer, and 14 indicates an intermediate metal layer including a nickel layer.

That is, as shown in FIG. 1, the titanium clad steel material of the present invention includes a titanium material 11, a steel plate 12, and a thin molybdenum layer 1 on the titanium material 11 side between these opposing surfaces.
3. A thin nickel layer 14 is disposed on the steel plate 12 side, and an intermediate metal layer is rolled and bonded.

FIG. 2 is a schematic sectional view showing a sandwich-like clad assembly for explaining the method for molding titanium clad steel materials of the present invention. In the figure, numerals 21 to 24 are respectively 1 in Fig. 1.
Corresponds to 1 to 14. Reference numeral 25 indicates a welded portion for sealing the entire periphery of the base material, 26 indicates a patch plate, and 27 indicates a release agent.

That is, according to the method for molding a titanium clad steel material of the present invention, as shown in the illustrated example, the titanium material 21 is bonded to the steel plate 22 in advance through the nickel layer 24 and the molybdenum layer 23 by, for example, explosive bonding, and the cladding is assembled. Form the material. Two clad assembly materials obtained in this way are prepared and placed with their titanium material sides facing each other, and between them, for example, zirconium oxide powder is interposed as a release agent 27, and both clad assembly materials are separated into a sandwich shape. A cladding assembly is formed and pasted, and then a welded portion 25 is provided using a patch plate 26 provided on the entire periphery of the steel plate 22, and the internal cavity is evacuated through the welded portion 25, and then heated at 650 to 1000°C. Rolling is performed by heating to . After cooling, cut and remove the ears around the entire periphery.
It is separated into two upper and lower single-sided titanium clad steel plates as shown in FIG.

The present invention will be further explained below with reference to Examples.

EXAMPLE A titanium clad steel material according to the present invention was manufactured by the method illustrated in FIG. The compositions of the steel plate used as the thick layer and the titanium plate used as the composite material are summarized in Table 1. Pure films of Ichi ■υ were used as the nickel and molybdenum layers, respectively. The clad assembly material is steel plate (
120 mm thick), a molybdenum layer (thickness 0.05 m1) placed on the titanium side, and a nickel layer placed on the base metal side (
(thickness 0.11) and a titanium plate (thickness 30 mm), two of which were combined to form a clad assembly as shown in FIG. After constructing the sandwich-like clad assembly in this way, the entire periphery was sealed by welding using a caul plate, the internal void was evacuated to 1O-2 Torr, and then heated to 850°C and rolled. Ta. This reduces the thickness of each layer to 12I and 0.005am, respectively.
, O, Ofin and three dragons. After rolling, the obtained titanium clad steel plate was subjected to an ultrasonic flaw detection test, and there was no peeling at the joint of the titanium clad steel plate manufactured by the method according to the present invention. Note that their mechanical properties are summarized in Table 2. Test numbers 1 and 2 show examples of titanium clad steel materials manufactured under the same conditions as described above according to the method of the present invention, and the difference in data between the two shows the dispersion of the experimental data. Similarly, test numbers 3 and 4 are comparative examples in which a single molybdenum layer is used as the intermediate metal layer, and the other manufacturing conditions are examples of manufacturing titanium clad steel materials according to the method of the present invention.

As is clear from the above test results, the titanium clad steel material according to the present invention exhibits good properties including high bonding strength.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of the titanium clad steel material of the present invention;
and FIG. 2 are schematic cross-sectional views of a sandwich-like titanium clad assembly according to the present invention. 11.21: Laminating material (titanium material) 12.22: Base material (steel plate) 13.23: Intermediate metal layer (molybdenum layer) 14.24:
Intermediate metal layer (nickel layer) Applicant Sumitomo Metal Industries Co., Ltd. Representative Patent Attorney Akira Hirose - 2 Red 1 Figure #2

Claims (3)

[Claims] (1) Consisting of a steel material as a base material, a titanium material as a mating material, and a metal intermediate layer rolled and joined between the opposing surfaces of these two, the metal intermediate layer is a nickel layer disposed on the base material side, A titanium clad steel material characterized by being composed of two layers, a molybdenum layer placed on the titanium material side. (2) A metal intermediate layer is sandwiched and joined with a steel material as a base material and a titanium material as a mating material to form a cladding assembly material, and the two cladding assembly materials are arranged so that the titanium material side faces each other.
A sandwich-like cladding assembly is obtained by combining the outer steel members with a release agent and sealing the entire periphery of both outer steel members, and after performing an evacuation treatment on the internal voids of the assembly, the obtained evacuated The above assembly is hot-rolled, and the metal intermediate layer is composed of two layers: a nickel layer disposed on the base material side and a molybdenum layer disposed on the titanium material side, and the hot rolling is A method for producing titanium clad steel material, characterized in that it is carried out in a temperature range of 1000°C. (3) When sandwiching and joining the metal intermediate layer to the base material and the laminate material, this is carried out by explosion bonding.
) The method for producing titanium clad steel described in section 2.