JPS61140393A - Manufacture of titanium clad steel - Google Patents

Abstract

PURPOSE:To obtain an increased manufacturing efficiency and improved quality of titanium clad steel by coating a mixture of Ni fine powdres having a specific size and an organic solvent and a mixture of Nb, Mo, etc. fine powdres having a specific size and an organic solvent on the surface of a base metal and the surface of a clad metal, respectively, heating and rolling both metals. CONSTITUTION:The surface of the base metal 1 is evenly coated with the Ni fine powdres 2 mixed into an organic solvent as an intermediate material and is dried. The surface of the clad metal 3 of titanium or a titanium alloy is evenly coated with the mixture of fine powdres 4 of a 1 kind among Nb, Mo, Zr, and V or >=2 kinds among them which not make an intermetallic compound and an organic solvent as an intermediate material and is dried. All the powder size are <100mum. The base metal 1 and the clad metal 3 are put one upon another putting the intermediate materials between those metals. Those metals are heated at a specific temp. and rolled. The method forms titanium clad steels having alpha phase, so that improved quality and increased manufacturing efficiency are obtained.

Description

[Detailed description of the invention] (a) Industrial application field The present invention is directed to the production of titanium clad steel, which is made by joining a base material made of carbon steel or low alloy steel and a composite material made of titanium or titanium alloy. Regarding the method.

(b) Conventional technology The so-called clad steel, which is made by bonding a composite material made of other metals to the base material of ordinary steel sheets, is classified into cast clad steel, explosion bonded clad steel, rolled clad steel, and explosion bonded rolled clad steel, depending on the manufacturing method. There are steel and cast-rolled crunds, etc. Titanium or titanium alloy is used as a composite material, and the method for manufacturing titanium clad steel is the explosion bonding clad method as described in "JIS G3603r titanium clad steel". Are known. However, since the explosive bonding cladding method is a method of crimping the base material and composite material using explosive force, there are restrictions on the size of the material, and it is difficult to obtain large rad steel sheet metals.

On the other hand, rolling cladding methods and overlay cladding methods are widely used to manufacture stainless clad steel using stainless steel as a composite material, but these methods cannot be used as manufacturing methods for titanium clad steel. Is this a metal compound of titanium and various metals? This is because a normal adhesive layer cannot be obtained. One possible way to solve this problem is to apply an intermediate layer of nickel foil or nickel plating between the base material and composite material, as in the special manufacturing of stainless clad steel. The foil or nickel plating layer has the problem of forming an intermetallic compound with titanium, resulting in significant embrittlement, making it difficult to manufacture clad steel.

Therefore, as a material for the intermediate layer, is there a material that is stable to titanium and does not react with titanium or titanium alloys to form intermetallic compounds? It is necessary to use these materials selectively, but it is difficult to obtain gold leaf for these materials, or there are problems with thermal loe properties, so it is difficult to use these materials in the same manner as in conventional manufacturing methods. A sound adhesion cannot be obtained between the material and the composite material.

Placing the intermediate layer on the surface of the composite material or the base material by plating not only poses problems in efficiency and economy, but also poses a problem in that it is not possible to produce a large rad steel plate.

? →Problems to be Solved by the Invention Forming a sound adhesive layer between a carbon steel base material and a titanium composite material in a timely, efficient and economical manner That's true.

B) Means for Solving the Problems The technical means of the present invention is based on a method for manufacturing clad steel that combines a base material made of carbon steel or low alloy steel and a composite material made of titanium or titanium alloy. C. Apply fine nickel powder with a particle size of 100 μm or less mixed with an organic solvent to the surface of the base material and the intermediate material to be inserted between the base material and the composite material. At least one type of fine powder of Nb, Mo, Zr, and V with a particle size of 100 am or less is mixed in a gold organic solvent and coated on the material side surface, and the base material and composite material are overlapped and η
It is configured to generate heat from the mouth.

(E) Embodiment An embodiment of the present invention will be described below with reference to FIG. 1.

In FIG. 1, first, fine powder 2 of nickel (Ni) mixed with a solvent as an intermediate material is uniformly coated in a layer on the surface of a base material 1 of carbon steel or low alloy steel, and then dried. On the other hand, the surface of the composite material 5 of titanium or titanium alloy has niobium (Nb
), molybdenum fMo), zirconium LZr)
or vanadium + y) or two or more types of fine powders 4 that do not form metal compounds with each other are mixed in a solvent, applied uniformly in a layer as an intermediate material, and dried.

and written N i + N b + M o , Z r and ■
The particle size of the fine metal powder is 100μ for the following reasons.
m or less. That is, the ratio of the total surface area of the fine powder to the particle size of the fine powder increases in inverse proportion to the particle size.

Therefore, when used, the finer the particle size of the fine metal powder, the greater the surface energy, and the more active the interfacial diffusion becomes. As is clear from the graph shown, sintering proceeds at low temperatures, and if the powder becomes ultra-fine, the melting point will be lowered.

On the other hand, when titanium and titanium alloys are heated from room temperature, cL
The phase transforms into the β phase, but the transformation temperature for pure titanium is 8
It is 82°C. Does titanium have excellent corrosion resistance in titanium clad steel? Since the main purpose is to use it, it is preferable to use it in a neutral manner. For this reason, when manufacturing titanium clad steel, it is desirable not to heat it above 880°C, and cladding is required at such low temperatures. For measurement purposes, it is preferable that the metal powder used be as fine as possible, and should be 100 μm or less.

In addition, the solvent must not only have an appropriate viscosity when applying the powder, but also be neutral and not react with other ingredients, have an appropriate rate of volatilization, and be free from toxic vapors. Lacquer-based organic solvents such as nitrocellulose lacquer, acetylcellulose lacquer, and nido-propane lacquer are preferred because they are required to be free of water, have no water absorption, and have no hygroscopicity.

Next, the base material 1 and the composite material 6 are placed on top of each other with the intermediate material in between, and heated to a predetermined temperature f, preferably 85,000 to 880°C.
)ic173 Heat and hot press.

[Specific implementation sequence]

As the base material, use a mild steel plate (equivalent to FSS41) with a thickness of 178 dia.
And the thickness is 24rrr as a composite material! R titanium plate fJI3
2 types)? In the method of the present invention, one or two types of metal powder are used, organic solvent C', S trocellulose 1
4% benzene, 35% benzene, 14 ml of danfur gum, 10 ml of butyl acetate, etc.) and applied with a brush to the surfaces of the base material and composite material as shown in Table 1 and dried, while the conventional technique In this case, insert a metal foil with a thickness of 10L] μm or apply metal plating to a thickness of 100μm, overlap the base material and composite material, and perform hot rolling so that the reduction ratio is 2 to obtain a titanium crand alloy. were manufactured and compared and studied for cladding.

Here, all judgments on cladding are made in the bonded state by ultrasonic testing. Represented by "x".

In addition, as shown in Table 1, comprehensive judgment is not only based on the judgment (analysis) of whether or not cladding is appropriate, but also considers the non-β phase of titanium as a composite material, workability window, and economic efficiency. A 2 , I/a 4 and &6 are satisfactory in terms of cladding, but the overall judgment is Δ because the aI8 temperature is high and titanium becomes β phase, and &7 is also cladding. However, as is clear from the above explanation, the method of manufacturing titanium clad steel of the present invention has relatively low effects in terms of workability and economy due to the use of Ni foil. Even large rad steel plates with good quality can be produced efficiently and economically.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the manufacturing order of the titanium clad steel of the present invention, and FIG. 2 is a diagram showing the relationship between the powder diameter and the v8 bonding start degree for ζNi. Patent applicant Sumitomo Metal Industries! Floor type company (5 people) Figure 1 Powder diameter (μ value)

Claims (1)

[Claims] In a method for manufacturing clad steel by combining a base material made of carbon steel or low alloy steel and a composite material made of titanium or a titanium alloy, as an intermediate material inserted between the base material and the composite material, Particle size 100 μm mixed with organic solvent on the surface of the base material side
Apply the following fine nickel powder and apply Nb to the composite material side surface.
A method for producing titanium clad steel, which comprises applying at least one type of fine powder of Mo, Zr, and V with a particle size of 100 μm or less in an organic solvent, overlapping the base material and composite material, and heating-processing. .