JPS6018205A - Manufacture of titanium-clad steel material - Google Patents

Abstract

PURPOSE:To obtain easily a Ti-clad steel material by joining clad set-up blank materials together, each of which is formed by holding an intermediate layer consisting of high Cr alloy between a steel material and a Ti ply-material, after interposing a release agent, and hot rolling the joined material from the sides of steel materials at a presecribed temperature. CONSTITUTION:A Ti-clad steel material is constituted of a ply-material of Ti material 1, a base material of steel plate 2, and an intermediate alloy layer of an alloy layer 3 containing >=10% Cr. For manufacturing the Ti-clad steel material, a clad set-up blank material is formed by previously joining the Ti material 1 to the steel material 2 by explosive cladding, for instance, through the alloy layer 3. Next, the above-mentioned two clad set-up blank materials are stuck together by opposing the sides of Ti materials 1 of them to each other after interposing a release agent 4 such as zirconium oxide powder between them. After forming a welding part 5 by utilizing a cover plate 6 provided to the whole periphery of the plates 2 to evacuate the inner space through the part 5, the stuck materials are rolled after heating then to 650-1,200 deg.C. After naturally cooling them, the lug of the whole periphery is cut off, and the stuck materials are separated into two one-side clad steel plates.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for manufacturing titanium crack &YIJ+, (made of a steel material as a base material and a titanium material as a laminated material).

So-called clad materials, which are made by laminating and integrating dissimilar metals in layers, have properties that cannot be obtained from individual metals, combine the excellent characteristics of each material, compensate for each other's shortcomings, and are inexpensive. However, titanium-steel cladding material has been widely used since 2000, but titanium-steel cladding material has been developed from the viewpoints of utilizing titanium's excellent corrosion resistance and the ability to reduce manufacturing costs by reducing the amount of titanium material used by cladding. The economy is two important things.

Various methods are known for manufacturing titanium-steel cladding, Zunawara titanium clad steel materials, and especially titanium clad steel sheets, but in the so-called rolling method or explosion rolling method, various metal intermediates are used. Although a method using a layer has been proposed, there are problems such as the formation of brittle intermetallic compounds in the metal intermediate layer interposed between the titanium layer and the copper phase, resulting in material deterioration, and the problem that There was also the problem that hydrogen and oxygen reacted with the titanium material used as the mating shrine, resulting in quality deterioration.

For example, in the method of using pure iron or several different metals as the metal intermediate layer, when using several different metal intermediate layers, there is a The work is complicated, such as having to insert a nickel-copper layer and a silver layer or a silver-manganese alloy layer on the titanium side, and when using pure iron, an alloy of pure iron and titanium must be inserted. There are problems such as the formation of a brittle alloy layer due to oxidation, and it is not advantageous from the viewpoint of industrial productivity or performance.

Therefore, an object of the present invention is to provide a method that eliminates the drawbacks of the above-mentioned conventional methods and allows titanium clad steel materials, particularly steel plates, to be manufactured more easily.

Here, the gist of the present invention is to sandwich and join a metal intermediate layer between a copper phase as a base material and a titanium material as a composite material to form a clad assembly material, and to form two clad assembly elements +A. The titanium material sides are placed opposite each other, and the steel materials on both sides are joined together with a release agent interposed therebetween to form a xantoinch-like cladding assembly in which the entire periphery of the steel materials on both sides is sealed, and then the internal voids of the assembly are subjected to exhaust treatment. and then hot rolling the resulting assembly of exhaust streams to produce a cladding, wherein the metal intermediate layer is a single layer of an alloy containing 10% by weight or more of chromium; Alternatively, the method of manufacturing a titanium clad steel material is characterized in that the titanium clad steel material is made of two layers, one layer of the alloy and a nickel layer, and the hot rolling is performed at a temperature range of 650 to 1200°C.

In the present invention, it is also preferable to use explosive bonding to sandwich and join the metal intermediate layer between the base material and the mating plate. However, it can also be done by partial brazing or by welding.

In one embodiment of the present invention, an alloy containing 10% or more of chromium, preferably alloy steel, is used as the metal intermediate layer. This is based on the new finding that by using it as an intermediate layer, the formation of Fe-Ti intermetallic compounds having brittle properties is suppressed. If the chromium content of the alloy as this metal intermediate layer is less than 10% by weight, the formation of Fe-Ti intermetallic compounds is not sufficiently suppressed, so titanium clad kA as a product is
cannot maintain good physical properties.

In the case of such alloys, such as alloy steel, the C contained therein
As alloying elements other than r, M + -1, MOLV, Ti,
Nb, Zr, and AI do not have a negative effect on bonding, but
Adding a large amount has no industrial advantage. Unavoidable impurity elements such as P and S may be contained at the usual level, but N
i, C, and St are not preferable because they do not have an adverse effect on bonding.

The alloy steel used in the present invention is not particularly limited as long as it contains 10% or more of chromium, but its typical chemical composition is shown in Table 1.

Table 1 In the present invention, when a nickel layer is interposed together with the above alloy layer, the nickel layer is placed on the base 4A side to improve the wettability of the metal intermediate layer to the base material and achieve strong bonding. It acts as a barrier layer of 100% during expansion and prevents the formation of chromium oxides and titanium carbides at the interface. In particular, the above-mentioned nickel layer is pure nickel (not pure nickel), and includes general nickel alloys as long as they are self-helping in improving wetting properties and preventing carbide formation.Therefore, there is no need to improve wetting properties. If there is no nickel layer or if there is no risk of carbide formation, it is not necessary to provide such a nickel layer.

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

Steel as the base material in the present invention () and composite l!4A
There are no particular restrictions on the composition and shape of the titanium material, and for example, any material used in conventional titanium clad steel H may be used. Moreover, any conventional hot rolling may be used, and the present invention is not particularly limited by this.

As described above, in the present invention, the clad assembly materials consisting of the base material, the metal intermediate layer, and the mating material are joined together with the +4 (that is, the titanium material) facing each other, generally with a stripping MlI agent interposed, and By sealing the entire periphery of the steel materials on both sides of the above assembly and exhausting air from the internal voids, titanium nitrides and oxides are generated on the joint surface between titanium and steel during heating and rolling. It also prevents the titanium from absorbing gas from the surrounding atmosphere, and there is no need to consider the deterioration of the titanium material, so the upper limit of the temperature in the rolling process can be increased to 1200°C. Benefits such as being able to increase therefore,
For example, since the rolling temperature can be raised to 1200° C., the reduction amount can be increased, and thereby the +A quality can be homogenized and the joint strength can be further increased.

The present invention will now be further described in connection with the accompanying drawings, the examples of which are shown for purposes of illustration only and are not intended to limit the invention thereto. In the figure, numeral 1 is a titanium material as a composite material, 2 is a steel plate as a base material,
3 is an alloy layer containing 10% by weight or more of Cr as an intermediate alloy layer, 4 is a release agent, 5 is a welded part for sealing the entire periphery of the base material, 6 is a patch plate, and 7 is an intermediate layer made of nickel. Each metal layer is shown.

That is, the example shown in FIG. 1 shows the case where Cr steel is used as the intermediate metal layer, and the titanium material 1 is bonded to the steel plate 2 in advance by, for example, explosive bonding via the alloy N3 to form the cladding material. is forming. The clad assembly material obtained in this way is 211! If prepared, the titanium material sides are placed opposite each other as shown in the figure, and a release agent 4, for example, zirconium oxide powder, is interposed and adhered therebetween, and a patch plate is installed around the entire periphery of the steel plate 2. The welded part 5 is heated to a temperature of 650 to 1200 DEG C. and then rolled through the welded part 5 to evacuate the internal cavity.

After cooling, the ears on the entire periphery were cut off and separated into two upper and lower single-sided titanium clad steel plates.

FIG. 2 shows an example of a two-layer structure using a nickel layer and an alloy layer as intermediate metal layers. In this example, the nickel layer 7 is installed on the steel material 2 side. Except for this, the case is substantially the same as that of FIG.

EXAMPLE The method according to the present invention was carried out according to the embodiment shown in FIG. Table 2 summarizes the compositions of the steel plate as the base material, the titanium plate as the mating plate, and the Cr alloy steel as the intermediate metal layer. The clad assembly material is steel plate (thickness 12'Omm>
, chromium alloy steel layer (2 dragons) and titanium plate (thickness 30
Two pieces of this are combined to form a clasp and clasp assembly. This was then hot rolled to a thickness of 121 m.
, 0.2 cranes and 3 angles.

After constructing the cladding assembly, the internal cavity is 1O-2
After exhausting to Torr, it was heated to 1000°C and rolled. 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 3. The example of test number 3.4 is shown as a comparative example, and the intermediate metal layer and the 8.22% Cr in Table 2 are shown as examples.
Alloy steel containing

As shown in the above test results, the titanium clad material produced by the method of the present invention exhibits good physical properties including high bonding strength.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a titanium cladding assembly; and FIG. 2 is a schematic cross-sectional view of a modification of the titanium cladding assembly. Unite in 1! 2: Matrix 3.7: Intermediate metal layer 4: Stripping agent Applicant Sumitomo Metal Industries Co., Ltd. Agent Patent attorney Akira Hirose - Kusa, No Fig. 2

Claims (2)

[Claims] (1) 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 clad assembly, and the two clad assembly materials are placed so that the titanium material sides face each other.
A sandwich-like cladding assembly is obtained by combining them with a release agent and sealing the entire periphery of the copper phase on both sides, and then performing an evacuation treatment on the internal cavity of the assembly. A method of manufacturing a crat material by hot rolling the already finished assembly, wherein the metal intermediate layer is a single layer of an alloy containing 10% by weight or more of chromium, or a 2N layer of a layer of the alloy and a nickel layer. and the hot rolling is 650 to 1
A method for producing titanium clad steel H, characterized in that it is carried out in a temperature range of 200°C. (2) The method for producing a titanium clad preparation according to claim 1, in which dirt is removed by explosive bonding when the metal intermediate layer is sandwiched and bonded between the base material and the laminate material.