JPS5832544A - Manufacture of clad plate - Google Patents

Abstract

PURPOSE:To produce two sheets of one-side clad plates which are covered with base metal at the end faces on both sides by sandwiching a release plate with two sheets of cladding layer materials, setting these materials in a mold, and casting the base matal round the same. CONSTITUTION:Two sheets of cladding layer materials 1, 1' are fixed by sandwiching a release plate 2 and are set in a mold 3. Molten metal 5 which is selected as a base material is cast through a charging port 6 in the bottom part of the mold by a bottom casting method and is charged up to the height A exceeding the top edge of the material 1. In a blooming stage, the materials are educed down not only in the thickness direction but in the width direction as well in order to join the side faces 1'' of the cladding layer materials and the base metal 5. After the materials are reduced down to a prescribed thickness by rolling, edges are cut off in the positions B, B in the width direction where the plate 2 is cut but the materials 1 are not cut, and the plate 2 is removed. Thus two sheets of one side clad plates which are covered with the base metal 5 in the end parts 7 on both sides are produced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a clad plate, particularly a clad plate suitable as a material for manufacturing electric resistance welded pipes.

For example, the use of clad steel pipes with a cladding layer of surface 1 abrasive material on the inner surface as steel pipes for pipe fins that transport highly abrasive materials such as slurry is extremely advantageous in terms of durability. I can say that.

The most common manufacturing method for clad steel pipes is to weld the clad plate into an electric resistance welded pipe, but in order to apply this method, it is necessary to The end face must have excellent bath contact properties. Normally, both the base metal and the cladding material appear on the side edge surface of a regular rad plate. Therefore, in order to ensure weldability on the side edge surface, both the base metal and the cladding material must be relatively easily soluble. The material must be made of As is well known, weldability is generally contradictory to wear resistance, etc. Therefore, in cases where the purpose of cuturad is to impart wear resistance, as in the example of the slurry transport pipe mentioned above, The fact that weldability is required for the clad material means that the wear resistance that can be ensured is limited, and the original meaning of the clad material is ultimately diminished. In other words, when the above-mentioned welding pipe manufacturing method is applied, it is not always possible to fully utilize the inherent characteristic of the cladding, which is to ensure contradictory properties at the same time.

As a countermeasure for this, the clad steel plate used as the material is made into a clad plate in which the cladding material (1) on both end faces is covered with the base material (S), as shown in the case of a single-sided clad steel plate in Fig. 1. One idea is to ensure the weldability of the clad plate side end face using the weldability of the base metal. In general, there are two methods for producing single-sided clad steel sheets: rolling and explosion bonding, which involve bonding two sheets of different steel types together, and methods that incorporate cladding material into the base material during the casting stage. A representative example of this is the so-called rotting one-piece method, in which the two parts are joined by blooming and rolling, and then divided. is impossible to obtain.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for efficiently and easily manufacturing a single-sided clad steel plate whose both end faces are covered with a base material.

That is, in the method of the present invention, two clad layer materials made of clad metal are fixed by sandwiching a steel peeling plate wider than the clad plates, and this is wrapped tightly in the base material, and then blooming,
The base material and the cladding layer material were joined together by rolling, and then an edge cut was performed at a position in the width direction that only covered the S release plate, and the release plate was removed, resulting in the structure shown in FIG. 1 of the two sheets. The feature is that a single-sided clad plate can be obtained.

Hereinafter, the method of the present invention will be explained in detail with reference to the drawings.

FIGS. 2(A) and 2(B) are a plan view and a longitudinal sectional side view showing the casting process in the method of the present invention. In the method of the present invention, the following steps are first taken prior to casting.

Cladding layer material (1) 2 made of metal for cladding
These two cladding layer materials (/B/l) are fixed by sandwiching a steel release plate (27) between them. At this time, the steel release plate (a) Layer material II)
A wider one must be used, and the surface of this release plate (:l) is coated with SiO.

Its purpose is to facilitate the peeling of the release plate (:l) after rolling. The peeling plate (two pieces of cladding material (!l) sandwiching and fixing the peeling plate (!l) is then set in the mold (3).

At this time, the outer surface of the cladding layer material (1) (1) is used to prevent oxidation of the cladding layer material and to prevent slag generated on the top surface of the molten metal during casting from being caught between the interface between the cladding layer material and the molten metal. Apply a slag repellent material to prevent this. As the slag repellent material, any volatile paint can be used. When setting into the mold (3), make sure that the upper edge (1) of the clad layer material (1) (/) is at least below the casting height position (A) of the mold (3). The layer material is supported by a support frame (111) fixed to the upper part (3') of the mold as shown in the figure.
It may be carried out by means such as hanging it in the mold (3).

Once the preparations have been made as described above, the molten metal (5) selected as the base material is cast. The pouring is performed through the injection port (6) at the bottom of the mold using the bottom pouring method, and the molten metal is poured into the mold to a height (A) exceeding the upper edge of the rad layer material (/l). .

The casting step in the method of the present invention is completed above, and the clad ingot obtained in this step is then sent to a bloomer. In the blooming process, reduction is of course performed in the thickness direction, but it is also necessary to perform reduction not only in that direction but also in the width direction. This is to achieve bonding between the side surface (1) of the clad layer material and the base material (S) shown in FIG. 3(A). A thickness reduction amount of 3 or more and a width reduction amount of /, 1 or more are necessary to completely join the cladding layer material (/l and base material [g)].

After blooming, it is reduced to a predetermined thickness by rolling, and then the steel peeling plate (C) is removed and edge cutting 9 is performed to obtain two single-sided crat steel plates. In other words, Figure 3 (b)
As shown in Fig.
] Cut the edge at a position in the width direction (BXB) that does not overlap, and remove the peeling plate (2). Since a release material is applied to the surface of the release plate in advance, the release plate (27) can be easily peeled off from the clad layer material (1) and the base material (3) after cutting.

By going through the above-mentioned ingot-forming, rolling, and cutting processes, a single-sided cladding with both ends (7) covered with the base metal (g), as shown in the same figure (c), is produced. Two plates are manufactured at the same time. For such a rad plate, if a easily soluble material such as low carbon steel is selected as the base material, weldability of the side end face will be ensured regardless of the material of the cladding layer, so as shown in Fig. As shown, a material suitable for manufacturing clad steel pipes whose side end surfaces are butted and welded can be obtained.

Next, examples of the present invention will be described.

Clad steel ingots were cast according to the method of the present invention under the conditions shown in Table 1. Next, the obtained steel ingot was subjected to blooming and rolling under the conditions shown in Table 2, and then edge cutting was performed to obtain a plate with a thickness of 2 das (base material layer: 1 cladding layer: / 31
11) A rad steel plate having a width of X as shown in FIG. 1 was obtained.

Table l Table 2 Using this steel plate as a material, a clad steel pipe with an outer diameter of 2001f was manufactured by electric resistance welding, but no peeling was observed at the boundary between the base material layer and the clad material layer during the pipe manufacturing process, even during bending. There were no U, S, or T defects. Furthermore, welding was extremely easy under normal conditions, and no defects such as cracking or peeling of the weld were observed. Furthermore, when the obtained clad steel pipe was subjected to a flat half test, the flat height was 0.7-0. It showed a good value of JD. The presence or absence of micro-inclusions was also investigated at the boundary between the Nada material layer and the cladding material layer in the cross section of the steel pipe, and as is clear from the cross-sectional microphotograph of the boundary shown in Figure 5, there were no inclusions. Its existence was not recognized at all. In addition, the shear strength also showed a good result of II/''g.

As is clear from the above explanation, the manufacturing method of the Crab board of the present invention can be applied to any type of cladding metal as long as the base metal used is easily soluble. It is possible to manufacture single-sided cladding boards that are suitable as materials.

Moreover, it is highly efficient and easy to implement, thus making it possible to fully utilize the characteristics of the steel for the electric resistance welded pipe of the present invention.

4t, Brief description of the drawings Figure 1 is a front view showing a clad plate suitable as a material for manufacturing ERW pipes, and Figure 2 (a) and trunk) are a plan view and longitudinal section showing a state in which it is armored by the method of the present invention. Side view, Figure 3 (a),
(b) and (c) are diagrams showing the blooming, rolling and cutting processes of a clad steel ingot based on the method of the present invention, and Figure μ shows an electric resistance welded pipe using a clad plate manufactured by the method of the invention. The front view shown in FIG. 5 is a cross-sectional photograph of a clad plate manufactured by the method of the present invention.

In the figure, l: cladding layer material, Koni W4 release plate, 3: mold, g: support frame, j: molten metal, t: molten metal inlet II 5 Figure □ - (B) 8 B'' (1101-() 1+2' ” (7,)↓ \Lν (ro) S=Ha・' 〒 51″ Procedural amendment (method) February 25, 1980 Patent application No. 131752 of 1981 2, title of invention Clad board Manufacturing method 3, relationship with the case of the person making the amendment Patent applicant address 5-15 Kitahama, Higashi-ku, Osaka Name (211)
Sumitomo Metal Industries Co., Ltd. Representative: Norifumi Kumagai 4, Agent address: 5-u Kawaramachi, Higashi-ku, Osaka (Amakusa Building) 6,
In column 7 of "Brief explanation of drawings" of the specification subject to amendment, contents of amendment (1) On the last line of page 10 of the specification, [Cross section of clad plate...]
・" has been corrected to "Cross section showing the metallographic structure of the boundary between the base material and the clad plate for a clad plate...".

that's all

Claims (1)

[Claims] (1) Prepare two clad layer materials made of clad metal, and insert a wide steel release plate between the clad layer materials and apply fire-resistant oxide as a release material to the entire surface to separate the two clad layers. Fix the material, apply a volatile slag repellent on both sides, set it in the armor mold, and pour the molten metal of the base metal to a predetermined height above the clad layer material by pouring,
The ingot cast as described above is bloomed and rolled to form the base material.
The cladding layer materials are joined together, and then an edge cut is made at a position in the width direction that covers the wide steel peeling plate and does not cover the cladding layer material, and the peeling plate is removed. A method for manufacturing a clad plate, characterized by obtaining two covered single-sided clad plates.