JPH07278610A - Hot extrusion method for hot isostatic press treated material - Google Patents

Abstract

PURPOSE:To inexpensively and easily produce an alloy having characteristics, such as resistances to corrosion, high-temp. corrosion, oxidation and wear, or a metal coated with the layers of this alloy on its surface. CONSTITUTION:Metallic powder 1 is packed alone or as a coating layer into a capsule 2 or a metallic plate having a thickness >=1cm is encapsulated into the uppermost part and/or the lowermost part of this capsule 2 at this time and the capsule is subjected to a hot isostatic pressing treatment. The powder is hot extruded without removing a cap 4 or the metallic plate on the upper surface and/or back surface of the capsule 2. As a result, clogging and discarding at the time of the hot extrusion are suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for hot extrusion of hot isostatically pressed material, and more particularly to the heat treatment of an alloy having characteristics such as corrosion resistance, high temperature corrosion resistance, oxidation resistance and wear resistance. The present invention relates to a manufacturing method by hot extrusion and a manufacturing method by hot extrusion of a metal whose surface is coated with an alloy layer having properties such as corrosion resistance, high temperature corrosion resistance, oxidation resistance, and wear resistance.

[0002]

2. Description of the Related Art In recent years, materials have come to be used in increasingly severe environments due to industrial progress and technological development. For example, in energy resource development, petroleum and natural gas that contain a large amount of hydrogen sulfide and carbon dioxide in the production fluid, that is, so-called sour oil and sour gas, have been developed. As a low alloy steel is used as the material, corrosion or cracking occurs, so nickel alloys such as Hastelloy C-276 and Inconel 625 (both are trade names) have already been used. These high alloy slabs are often poor in hot workability, but by producing high alloy as a powder and subjecting it to hot isostatic pressing (hereinafter referred to as HIP) to obtain a raw material, hot extrudability is improved. Is well known to be significantly improved, and is used as a method for drawing a difficult-to-work material while hot.

Further, since these high alloys are very expensive, so-called clad steel is used in which these alloys are used as a laminated material only on the surface of the structural material and the strength is secured by the underlying metal, for example, a low alloy steel. Has been done. As a manufacturing method thereof, in JP-A-64-202, a powder of another metal is applied to the surface of a metal material at a gas pressure of 300 kg / cm ² or more at a solidus temperature of the other metal or less. HI
A method of forming a coating layer by P treatment and then performing hot working and stretching is described, and a hollow billet having a coating layer formed on the outer surface by HIP treatment is actually subjected to hot extrusion processing to obtain a double layer. The tube is manufactured.

[0004]

However, in general, when hot extrusion is performed, a maximum pushing force called a so-called top peak is required immediately before the material comes out of the die and starts moving. In this case, the HIP-treated material generally has a large deformation resistance, so that the top peak often exceeds the facility capacity and the material is often clogged. Therefore, in order to reduce the top peak, it is often practiced to weld a metal material of the same diameter with a small hot deformation resistance to the tip side (top side) in the extrusion direction of the extruded material. large.

Further, after hot extrusion, there is always an unpressed residue called discard, which causes a decrease in yield. In particular, the HIP-treated material or the material having the coating layer formed by the HIP treatment is very expensive, and it is essential to improve the yield in order to reduce the cost. As a countermeasure against this, it is considered that welding of a low-priced metal material of the same diameter to the rear end side (bottom side) in the extrusion direction of the extruded material avoids the discarding of the expensive material, as in the top peak reduction method described above. However, due to the trouble and cost, it is hardly implemented in reality.

The present invention provides an alloy having characteristics such as corrosion resistance, high temperature corrosion resistance, oxidation resistance and wear resistance, and corrosion resistance,
It is intended to provide a method for easily and inexpensively producing a metal whose surface is coated with an alloy layer having characteristics such as high-temperature corrosion resistance, oxidation resistance, and wear resistance.

[0007]

The method for hot extruding the hot isostatic pressing material of the present invention is as follows.

In a hot extrusion method in which a capsule is filled with metal powder, hot isostatic pressing is performed, and then hot extrusion is performed to stretch the capsule, the lid on the upper surface and / or the lower surface of the capsule is subjected to hot isostatic pressing. A method for hot extrusion of hot isostatic pressing material, which comprises hot extruding without removing after press processing.

Another kind of metal powder is filled in the gap between the surface of the metal material and the capsule, a coating layer of another kind of metal is formed on the surface of the metal material by hot isostatic pressing, and then hot extrusion is applied to stretch the metal material. In the hot extrusion method, the hot extrusion method for hot isostatic pressing material is characterized in that hot extrusion is performed without removing the upper and / or lower lid of the capsule after hot isostatic pressing. .

In a hot extrusion method in which a metal powder is filled in a capsule, hot isostatic pressing is performed, and then hot extrusion is performed to stretch the metal powder in the capsule. A hot isostatic pressing material characterized by encapsulating a metal plate having a thickness of 1 cm or more in the upper and / or lowermost part and hot extruding without removing the metal plate after hot isostatic pressing. Hot extrusion method.

Another kind of metal powder is filled in the gap between the surface of the metal material and the capsule, a coating layer of another kind of metal is formed on the surface of the metal material by hot isostatic pressing, and then hot extrusion is performed to stretch. In the hot extrusion method described above, a metal plate having a thickness of 1 cm or more is enclosed in the uppermost part and / or the lowermost part of the capsule, and hot extruding is performed without removing the metal plate after hot isostatic pressing. A method for hot extruding a material subjected to hot isostatic pressing.

In the present invention, hot extrusion refers to processing within a temperature range in which a metal material or metal powder material is normally processed for the purpose of molding or the like. When selecting the processing temperature, the metal material or metal powder is used. It is necessary to select an appropriate temperature for each material.

Further, the kinds of metal powder and metal material are not particularly limited. For example, as the metal powder, corrosion resistance, high temperature corrosion resistance, oxidation resistance, wear resistance and the like may be selected according to the required function,
For example, Hastelloy, stellite, Ni-Cr alloy, stainless steel, Fe-based superalloy, nickel and nickel alloys, cobalt and cobalt alloys, titanium and titanium alloys and the like can be mentioned. On the other hand, examples of the metal material include carbon steel, low alloy steel, stainless steel, nickel and nickel alloys, cobalt and cobalt alloys, titanium and titanium alloys. The material of the capsule or the metal plate is not particularly limited, and examples thereof include a metal material such as carbon steel which is inexpensive and has a low resistance to hot deformation. The thickness of the capsule lid or the metal plate is preferably at least 1 cm or more in order to achieve the object of the present invention, but the upper limit is not particularly limited, and the extrusion ratio, the hot deformation of the powder material, etc. It can be appropriately selected according to the resistance and the like.

[0014]

The present invention focuses on the capsule lid used for filling the high alloy powder during the HIP process. That is, since the encapsulation material is diffusion-bonded to the metal material or the metal powder material after the HIP treatment, it is usually removed by machining, but the capsule lid portion diffusion-bonded to the top side and the bottom side of the metal material. If you use it as a hot extruded material without removing it, the cap portion of the capsule will reduce the top peak and at the same time it will become a discard, so you can omit the labor and cost of welding a metal material with the same diameter as the material. You can

If the lid of the capsule cannot have a thickness of 1 cm or more, a metal plate having a thickness of 1 cm or more can be enclosed at the top and / or the bottom of the capsule at the same time.
Since the metal plate is diffusion-bonded to the metal material or the metal powder material after the HIP treatment, the same effect as in the case of the capsule lid can be obtained.

The present invention will be described in detail below.

First, the metal powder is subjected to HIP treatment alone, or a coating layer of another metal is applied to the surface of the metal material.
It is formed by P. In the former case, for example, the metal powder 1 is filled and sealed in the capsule 2 in the manner shown in FIG. 1 and then hot isostatic pressing is performed to bond the metal powders to each other without a gap. In the latter case, the powder of another kind of metal is used, for example, in the procedure shown in FIG.
And the other kind metal powder 1 are filled and sealed in a capsule 2, and then hot isostatic pressing is performed to form the other kind metal powder 1 as a coating layer and at the same time, to form a metal bond between the coating layer and the metal material 3. It is possible to provide sufficient bonding strength at the bonding interface.

When a metal plate is used, the metal plate is enclosed at the top and / or the bottom of the capsule at the same time when the powder is filled. When the HIP process is performed on the metal powder alone, for example, the metal powder 1 and the metal plate 5 are filled and sealed in the capsule 2 as shown in FIG. 4, and then hot isostatic pressing is performed to form a gap between the metal powders. Instead, the metal powder 1 and the metal plate 5 are simultaneously metal-bonded. When a coating layer of another metal is formed on the surface of the metal material by HIP, powder is used as the other metal, for example, the metal material 3, the other metal powder 1, and the metal plate as shown in FIG. 5 is filled and sealed in the capsule 2, and then hot isostatic pressing is performed to form another kind of metal powder as a coating layer, and at the same time, the coating layer, the metal raw material 3, and further the metal plate 5
And can be metal-bonded to each other, and sufficient bonding strength can be provided at the bonding interface.

At this time, in order to satisfactorily hot extrude in the next step, it is necessary to secure the hot workability of the portion which was the metal powder before the HIP treatment.
It is important not to leave pores in the metal powder portion after the P treatment, and it is important to make the inside of the closed container a vacuum and to perform hot isostatic pressing at a sufficiently high temperature and pressure. For that purpose, the degree of vacuum is preferably 1 × 10 ⁻³ Torr or less. The HIP temperature varies depending on the type of metal powder or the combination of metal material and metal powder,
In order to maintain good hot workability, the temperature must be lower than the solidus temperature of each metal. This is because if the solidus temperature is exceeded, segregation of the component elements will occur during cooling, and the hot workability in the next step will be significantly reduced.
In order to shorten the HIP time, it is effective to set the temperature as high as possible within the above temperature range.

Next, the HIP-treated material is machined so as to be subjected to hot extrusion in the next step. As described above, normally all of the encapsulant that is diffusion bonded to the metal material or the metal powder material is removed during this machining, whereas in the present invention, as shown in FIG. Capsule lid 4 diffusion bonded to top and bottom sides 4
Alternatively, the metal plate 5 is not removed intentionally and used as it is as a part of the hot extrusion material. At this time, as described above, the thickness of the capsule lid 4 or the metal plate 5 is preferably 1 cm or more. The reason is that if the lid 4 part or the metal plate 5 is too thin, the top peak cannot be sufficiently reduced in the case of the top side, and in the case of the bottom side, the entire discard is the lid 4 part or This is because it does not become the metal plate 5. In addition, the material of the capsule or the metal plate is preferably a metal material such as carbon steel which is inexpensive and has a low resistance to hot deformation. This is because the top peak can be reduced as the hot deformation resistance decreases.

Next, hot extrusion is performed. When the hot extrusion material is produced as described above, even if it is a single layer material or a composite material, it can be hot extruded in the same manner as usual without worrying about clogging due to top peaks, Further, waste of the discard section can be reduced.

In the case of forming the coating layer, when the shape of the metal material is a pipe, the coating layer may be one surface, for example, the inner surface of the pipe or the outer surface of the pipe, or both surfaces, that is, both inner and outer surfaces of the pipe. Is. Depending on the situation in which the product is used, one side or both sides may be selected appropriately.

After hot extrusion, for example, quenching, tempering, for the purpose of adjusting the strength and toughness of the base material,
Various heat treatments such as normalizing can also be performed.

The present invention can be applied to produce products requiring resistance to corrosive substances, products requiring resistance to high temperature oxidation, and products requiring wear resistance, such as pipes. , And a shape such as a rod. Alternatively, it can be used as a material for manufacturing a product by further performing molding, welding, and the like.

[0025]

[Examples] The materials shown in Tables 1 and 2 and the materials to be subjected to hot extrusion were manufactured under the HIP conditions. Inventive Example N
o. 1 to 8 are examples of using without removing the lid of the capsule,
Inventive Example No. Nos. 1 and 2 are examples in which HIP treatment is performed on the metal powder alone, and the present invention example No. Nos. 3 and 4 are examples in which a coating layer is formed on the outer surface of the hollow round billet. Nos. 5 and 6 are examples in which a coating layer is formed on the outer surface of the round billet. Nos. 7 and 8 are examples in which a coating layer is formed on the inner surface of a hollow round billet. Also,
Inventive Example No. Nos. 9 to 16 are examples in which a metal plate is enclosed and used. Nos. 9 and 10 are examples in which the metal powder alone is HIP treated, and the present invention example Nos. Nos. 11 and 12 are examples in which a coating layer is formed on the outer surface of the hollow round billet, and the invention example No. 13, 14
Is an example in which a coating layer is formed on the outer surface of a round billet, and Example N of the present invention
o. Reference numerals 15 and 16 are examples in which a coating layer is formed on the inner surface of a hollow round billet. Inventive Example No. 3-8 and No. 11
In Nos. 16 to 16, the alloy powder for the coating layer was formed as a coating layer on the surface of the metal material by hot isostatic pressing. Each shape is shown in FIGS. 7 shows an example in which the metal powder material 6 alone is subjected to HIP treatment, FIG. 8 shows an example in which a coating layer of the metal powder material 6 is formed on the outer surface of the hollow round billet 7, and FIG. 9 shows the metal powder material 6 on the outer surface of the round billet 8. An example of forming a coating layer, FIG. 10 is an example of forming a coating layer of the metal powder material 6 on the inner surface of the hollow round billet 7. On the other hand, Comparative Example No. 1
Nos. 7 to 24 are examples of the present invention. 1-8 or N
o. This is an example in which the lid portion of the capsule is removed by mechanical processing after HIP processing as in 9 to 16.

[0026]

[Table 1]

[0027]

[Table 2]

Next, these materials were hot extruded under the conditions shown in Table 3. The results are also shown in Table 3.

[0029]

[Table 3]

Comparative Example No. Nos. 17, 18, 21, and 22 were clogged due to top peaks, and the other comparative examples were not clogged, but discarding wasted. On the other hand, the present invention example No. All of Nos. 1 to 16 could be satisfactorily hot extruded, and the discard portion was made of the material or the metal plate that was the lid portion of the encapsulant, so that no waste was generated.

[0031]

According to the present invention, the hot isostatic pressing material can be stably hot extruded without waste.

[Brief description of drawings]

FIG. 1 is a diagram showing a filling procedure in a hot isostatic press using a metal powder alone when a capsule lid is used.

FIG. 2 is a diagram showing a filling procedure in a hot isostatic press for forming a coating layer of another metal on the surface of a metal material when a capsule lid is used.

FIG. 3 is a diagram showing an example of a material machined after the hot isostatic pressing while leaving the capsule lid.

FIG. 4 is a diagram showing a filling procedure in a hot isostatic press using a metal powder alone when a metal plate is used.

FIG. 5 is a view showing a filling procedure in a hot isostatic press for forming a coating layer of another metal on the surface of a metal material when using a metal plate.

FIG. 6 is a diagram showing an example of a material machined after leaving a metal plate after hot isostatic pressing.

FIG. 7 is a cross-sectional view showing a stacking procedure of processing materials.

FIG. 8 is a cross-sectional view showing a stacking procedure of processing materials.

FIG. 9 is a cross-sectional view showing how to laminate the processing materials.

FIG. 10 is a cross-sectional view showing a stacking procedure of processing materials.

[Explanation of symbols]

 1 Metal Powder 2 Capsule 3 Metal Material 4 Lid 5 Metal Plate 6 Metal Powder 7 Hollow Round Billet 8 Round Billet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B22F 3/15 F27B 17/00 301 F

Claims (4)

[Claims] 1. A hot extrusion method in which a metal powder is filled in a capsule, hot isostatic pressing is performed, and then hot extrusion is performed to stretch the capsule. A hot extrusion method for hot isostatic pressing, comprising hot extruding without removal after isostatic pressing. 2. The other material metal powder is filled in the gap between the surface of the metal material and the capsule, a coating layer of the other material is formed on the surface of the metal material by hot isostatic pressing, and then hot extrusion is performed. In the hot extrusion method for stretching, the hot pressing of the hot isostatic pressing material is characterized by hot extruding without removing the upper and / or lower lids of the capsules after hot isostatic pressing. Extrusion method. 3. A hot extrusion method in which a metal powder is filled in a capsule, hot isostatic pressing is performed, and then hot extrusion is performed to stretch the metal powder in the capsule. A hot isostatic pressing process, characterized in that a metal plate having a thickness of 1 cm or more is enclosed in the uppermost part and / or the lowermost part of, and hot extruding is performed without removing the metal plate after the hot isostatic pressing process. Method for hot extrusion of wood. 4. A gap between the surface of the metal material and the capsule is filled with another kind of metal powder, a coating layer of another kind of metal is formed on the surface of the metal material by hot isostatic pressing, and then hot extrusion is performed. In the hot extrusion method of stretching by stretching, a metal plate having a thickness of 1 cm or more is enclosed in the uppermost part and / or the lowermost part in the capsule, and the hot extrusion is performed without removing the metal plate after hot isostatic pressing. A method for hot extruding a material subjected to hot isostatic pressing.