CN115255840A - A kind of mechanical composite steel pipe and preparation method thereof - Google Patents

Abstract

The invention discloses a mechanical composite steel pipe, which comprises a base plate and a composite plate, wherein the composite plate is positioned inside the base plate, the composite plate and the base plate are coaxially arranged, the peripheral edge of the composite plate is fixedly connected with the inner surface of the base plate, and the composite plate is fixedly connected with two ends of the base plate through welding seams. The invention also discloses a preparation method of the mechanical composite steel pipe. By adopting the mechanical composite steel pipe and the preparation method thereof, the problem that the large-caliber thick-wall composite steel pipe is difficult to manufacture can be solved.

Description

A kind of mechanical composite steel pipe and its preparation method

technical field

The invention relates to the technical field of steel pipes, in particular to a mechanical composite steel pipe and a preparation method thereof.

Background technique

Composite steel pipe is generally a layer of plastic pipe inside or outside the steel pipe, or spray paint inside the light pipe, and compound ceramic materials inside the steel pipe to improve the corrosion resistance and wear resistance of the steel pipe. For example, the publication number is CN200920038236.9, which discloses a ceramic composite steel pipe. A corundum ceramic layer and a transition layer are arranged in the steel pipe to improve the wear resistance and corrosion resistance of the steel pipe by utilizing the characteristics of high hardness and chemical inertness of alumina. CN201396521 discloses a polyurethane composite steel pipe, in which a polyurethane layer is lined inside the steel pipe to improve the mechanical shock resistance of the steel pipe. But above-mentioned all is the composite between steel pipe and pottery or plastic pipe.

CN105598664B discloses an assembly device and a method for assembling a bimetallic composite steel pipe. The assembly device inserts the liner into the interior of the base pipe to avoid scratching the base pipe and the liner. The bimetallic composite pipe liner is not easy to connect with the base pipe, and the liner is not easy to be inserted into the base pipe, so the operation is inconvenient. CN113770662A discloses a manufacturing method of a small-diameter bimetallic composite welded steel pipe. The bimetallic composite steel coil is milled to form a welded groove, and then the bimetallic composite steel coil is welded together, and finally obtained by plastic shaping machine. Bimetal composite pipe. In this patent, the wall thickness of bimetal composite steel pipe is (1.5+4)mm, and the outer diameter is 168mm, which belongs to the preparation of thin-walled small-diameter bimetal composite pipe. The forming of it is very difficult, and this production method is not suitable for the production of thick-walled and large-diameter composite steel pipes.

Contents of the invention

The object of the present invention is to provide a mechanical composite steel pipe to solve the problem that the large-caliber thick-wall composite steel pipe is not easy to manufacture. Another object of the present invention is to provide a method for preparing a mechanically clad steel pipe.

In order to achieve the above object, the present invention provides a mechanical composite steel pipe, comprising a base plate and a clad plate, the clad plate is located inside the base plate, the clad plate and the base plate are coaxially arranged, and the surrounding edges of the clad plate are in contact with the base plate The inner surface of the board is fixedly connected, and the two ends of the clad board and the base board are fixedly connected by welding.

Preferably, the wall thickness of the composite steel pipe is 10mm-100mm, the thickness of the clad plate is 2mm-8mm, and the thickness of the clad plate is not greater than the thickness of the base plate.

Preferably, the outer diameter of the composite steel pipe is 406mm-1520mm.

Preferably, the width of the clad plate is 20-40 mm smaller than the width of the base plate, and the length of the clad plate is 40-60 mm shorter than the length of the base plate.

Preferably, the peripheral edges of the clad plate are welded and fixedly connected to the inner surface of the base plate.

Preferably, the base plate is a carbon steel plate or an alloy steel plate, and the cladding plate is a stainless steel plate.

The preparation method of the above-mentioned mechanical clad steel pipe comprises the following steps:

S1. Clean the surface of the base board and the clad board, and cut the base board and the clad board according to the size requirements;

S2. Align the clad plate with the base plate, and use transition welding material to weld and fix the edge of the clad plate and the inner surface of the base plate to form a composite plate;

S3, putting the composite plate into the JCOE molding machine for molding to obtain a tube blank;

S4. The longitudinal seam of the tube blank is fixedly connected by welding to obtain a composite steel tube.

The advantages and positive effects of a mechanical composite steel pipe and its preparation method according to the present invention are:

1. The size of the clad plate is smaller than that of the base plate, and the clad plate and the base plate are centered, which is convenient for the pressing and forming of the composite steel pipe.

2. The clad plate is firstly welded and fixed with the base plate to avoid a large position during the forming process, improve the bonding effect of the composite layer and the base plate, and improve the forming quality of the composite steel pipe.

3. The composite board and the base board are formed by the JCOE molding machine. During the molding process, the multi-layer board and the base board are extruded by the mold, so that the mechanical composite is formed between the clad board and the base board, which is not only convenient for forming, but also Moreover, the composite effect is high, and it is suitable for the composite of thick-walled and large-diameter metal steel pipes.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a structural schematic diagram of a steel pipe in an embodiment of a mechanical composite steel pipe and its preparation method according to the present invention;

Fig. 2 is a schematic diagram of a steel pipe unfolded structure of an embodiment of a mechanical composite steel pipe and its preparation method according to the present invention;

Fig. 3 is a schematic diagram of a developed cross-sectional structure of a steel pipe in an embodiment of a mechanically clad steel pipe and its preparation method according to the present invention.

reference sign

1. Basic board; 2. Multi-layer board; 3. Weld seam.

Detailed ways

The technical solutions of the present invention will be further described below through the accompanying drawings and embodiments.

Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

Example

Fig. 1 is a structural schematic diagram of a steel pipe structure of a mechanical composite steel pipe and its preparation method embodiment of the present invention, Fig. 2 is a schematic diagram of a steel pipe unfolded structure of a mechanical composite steel pipe of the present invention and an embodiment of its preparation method, Fig. 3 is a Schematic diagram of the unfolded cross-sectional structure of the steel pipe in the embodiment of the mechanically clad steel pipe and the preparation method thereof. As shown in the figure, a mechanical composite steel pipe includes a base plate 1 and a clad plate 2, the clad plate 2 is located inside the base plate 1, and the clad plate 2 and the base plate 1 are arranged coaxially. The width of the composite board 2 is 20-40mm smaller than the width of the base board 1, and the length of the clad board 2 is 40-60mm smaller than the length of the base board 1, that is, the two ends of the base board 1 are 20-30mm longer than the clad board 2 , both sides of the base board 1 are 10-20mm longer than the clad board 2, which is beneficial to the roll forming of the base board 1 and the clad board 2.

The surrounding edges of the clad plate 2 are welded and fixedly connected to the inner surface of the base plate 1, and the clad plate 2 and the base plate 1 are sealed so that there is no large relative position between the clad plate 2 and the base plate 1 , which is beneficial to improve the sufficient bonding between the clad board 2 and the base board 1 during the rolling process.

Both ends of the clad plate 2 and the base plate 1 are fixedly connected by welding seams 3 . After the rolling is completed, both ends of the clad plate 2 and the base plate 1 are connected by argon arc welding, submerged arc welding or plasma welding, thereby completing the production of the composite steel pipe.

The base plate 1 is a carbon steel plate, an alloy steel plate or a pipeline steel plate, and the cladding plate 2 is a stainless steel plate. The thickness of the clad plate 2 is 2mm-8mm, and the wall thickness of the composite steel pipe is 10mm-100mm. The thickness of the clad board 2 is not greater than the thickness of the base board 1 .

The outer diameter of the composite steel pipe is 406mm-1520mm.

The preparation method of the above-mentioned mechanical clad steel pipe comprises the following steps:

S1. Clean the surface of the base board 1 and the clad board 2 by using acetone or the like to clean the surface of the base board 1 and the clad board 2 . Cut the base board 1 and the clad board 2 according to the size requirements.

S2. Align the clad plate 2 with the base plate 1, and weld and fix the edge of the clad plate 2 and the inner surface of the base plate 1 with a transition welding material to form a clad plate.

S3. Put the composite board into the JCOE molding machine for molding. During the molding process, the composite board is pressed by the mold of the JCOE molding machine, so that the base board 1 and the clad board 2 form a mechanical composite. After the molding is completed, a tube blank with a longitudinal seam is obtained.

S4. The longitudinal seam of the tube blank is fixedly connected by welding to obtain a composite steel tube. Welding method can choose argon arc welding, submerged arc welding or plasma welding according to needs.

The above-mentioned method can be used to produce composite steel pipes of standard caliber, and also can produce composite pipes of non-standard caliber.

Therefore, the present invention adopts the above-mentioned mechanical composite steel pipe and its preparation method, which can solve the problem that the large-diameter thick-wall composite steel pipe is not easy to manufacture.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it still Modifications or equivalent replacements can be made to the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims (7)

1. The utility model provides a mechanical composite steel pipe which characterized in that: the composite plate is positioned in the base plate, the composite plate and the base plate are coaxially arranged, the peripheral edge of the composite plate is fixedly connected with the inner surface of the base plate, and the composite plate is fixedly connected with the two ends of the base plate through welding seams.

2. The mechanical composite steel pipe according to claim 1, wherein: the wall thickness of the composite steel pipe is 10mm-100mm, the thickness of the composite laminated plate is 2mm-8mm, and the thickness of the composite laminated plate is not larger than that of the base plate.

3. The mechanical composite steel pipe according to claim 1, wherein: the outer diameter of the composite steel pipe is 406mm-1520mm.

4. The mechanical composite steel pipe according to claim 1, wherein: the width of the composite plate is 20-40mm smaller than that of the base plate, and the length of the composite plate is 40-60mm smaller than that of the base plate.

5. The mechanical composite steel pipe according to claim 1, wherein: the peripheral edge of the composite plate is fixedly connected with the inner surface of the base plate in a welding mode.

6. The mechanical composite steel pipe according to claim 1, wherein: the base plate is a carbon steel plate or an alloy steel plate, and the clad plate is a stainless steel plate.

7. A method of manufacturing a mechanically clad steel pipe according to any one of claims 1 to 6, comprising the steps of:

s1, cleaning the surfaces of a base layer plate and a clad layer plate, and cutting the base layer plate and the clad layer plate according to the size requirement;

s2, aligning the composite plate with the base plate, and welding and fixing the edge of the composite plate and the inner surface of the base plate together by adopting a transitional welding material to form a composite plate;

s3, placing the composite plate on a JCOE forming machine for forming to obtain a pipe blank;

and S4, fixedly connecting longitudinal seams of the tube blanks in a welding and sealing manner to obtain the composite steel tube.

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