阅读说明：本技术 一种利用激光熔覆的耐腐蚀管道 (Corrosion-resistant pipeline utilizing laser cladding ) 是由 张威劲 黄生旺 于 2020-11-03 设计创作，主要内容包括：本发明属于输送管道技术领域,特别涉及一种利用激光熔覆的耐腐蚀管道,包括有钢管、内层和外层：所述钢管内表面焊接有内层,所述钢管外表面熔覆有外层；所述内层包括有连接钢圈；连接钢圈内表面从里至外依次熔覆有内层中间层、内层熔覆层；连接钢圈与钢管间隙配合等。本发明通过氮化硼、镍基合金粉末都均具有优异性能,使得所述管道外表面、内表面其再加工形成熔覆层,使得所述管道具有耐腐蚀性、强度、防爆等优异性能,在通过连接钢圈与钢管间隙配合,且连接钢圈焊通过两端焊接于钢管内表面,使得钢管能够直接熔铸一体成型,不必先加工再次卷圈的过程,能够保证管道的硬度,从而达到不影响管道硬度能够再加工的效果。(The invention belongs to the technical field of conveying pipelines, and particularly relates to a corrosion-resistant pipeline cladded by laser, which comprises a steel pipe, an inner layer and an outer layer: the inner layer is welded on the inner surface of the steel pipe, and the outer layer is cladded on the outer surface of the steel pipe; the inner layer comprises a connecting steel ring; an inner-layer middle layer and an inner-layer cladding layer are sequentially cladded on the inner surface of the connecting steel ring from inside to outside; the connecting steel ring is in clearance fit with the steel pipe, and the like. According to the invention, the boron nitride and the nickel-based alloy powder have excellent performances, so that the outer surface and the inner surface of the pipeline are reprocessed to form the cladding layer, the pipeline has excellent performances such as corrosion resistance, strength and explosion resistance, the connecting steel ring is in clearance fit with the steel pipe, and the connecting steel ring is welded on the inner surface of the steel pipe through two ends, so that the steel pipe can be directly cast and integrally formed, the process of processing and coiling the steel ring again is not needed, the hardness of the pipeline can be ensured, and the effect of reprocessing without influencing the hardness of the pipeline can be achieved.)

1. A corrosion resistant pipe by laser cladding, characterized in that: including steel pipe, inlayer and skin: the inner layer is welded on the inner surface of the steel pipe, and the outer layer is cladded on the outer surface of the steel pipe;

the inner layer comprises a connecting steel ring; an inner-layer middle layer and an inner-layer cladding layer are sequentially cladded on the inner surface of the connecting steel ring from inside to outside; the connecting steel ring is in clearance fit with the steel pipe and welded on the inner surface of the steel pipe through two ends;

the outer layer comprises an outer layer middle layer and an outer layer cladding layer; an outer-layer middle layer and an outer-layer cladding layer are sequentially fused on the outer surface of the steel pipe from inside to outside;

the inner layer middle layer and the outer layer middle layer are made of nickel-based alloy powder;

the inner cladding layer and the outer cladding layer are made of a material prepared by mixing 30% of boron nitride powder and 70% of nickel-based alloy powder.

2. The corrosion-resistant pipe cladded by laser cladding as claimed in claim 1, wherein: the thickness of the connecting steel ring, the inner-layer middle layer, the inner-layer cladding layer, the outer-layer middle layer and the outer-layer cladding layer is 1.5-3 mm.

3. A corrosion resistant pipe by laser cladding as claimed in any one of claims 1-2, wherein: the production process of the corrosion-resistant pipeline comprises the following steps:

i. pretreatment: preparing a steel pipe to be treated, and pretreating the steel pipe to be treated, namely cleaning impurities on the inner surface and the outer surface of the steel pipe;

outer cladding: preheating a pretreated steel pipe, heating to 150-200 ℃, uniformly coating nickel-based alloy powder on the outer surface of the steel pipe by adopting a synchronous powder feeding method, cladding the nickel-based alloy powder on the outer surface of the steel pipe by utilizing a laser cladding process to form an outer-layer middle layer, rapidly cooling the outer-layer middle layer to 200-250 ℃, uniformly coating 30% of boron nitride powder and 70% of nickel-based alloy powder on the outer surface of the outer-layer middle layer by utilizing synchronous powder feeding, cladding the 30% of boron nitride powder and 70% of nickel-based alloy powder on the outer surface of the outer-layer middle layer by utilizing the laser cladding process to form an outer-layer cladding layer, and naturally cooling;

inner layer fabrication: the steel strip is pretreated, namely the outer surface of the steel strip is cleaned of impurities, and after the treatment is finished, preheating a steel strip, heating to the temperature of 150-, coiling the steel strip by using a coiling machine to enable the inner layer cladding layer to face inwards to form a connecting steel ring;

forming a steel pipe: inserting the connecting steel ring into the steel pipe, fitting the connecting steel ring and the steel pipe in a clearance fit and clearance fit manner, welding two ends connected with the connecting steel ring and the steel pipe, and finally, processing to enable the end parts of the connecting steel ring and the steel pipe to be ground flat, so that the corrosion-resistant pipeline is formed.

4. The corrosion-resistant pipe cladded by laser cladding as claimed in claim 1, wherein: the laser cladding process parameters of the outer layer middle layer and the inner layer middle layer are as follows: the laser power is 1200-1800w, the protective gas flow is 700/h-900L/h, the scanning speed is 2mm/s-4mm/s, and the spot diameter is 20 mm.

5. The corrosion-resistant pipe cladded by laser cladding as claimed in claim 1, wherein: the laser cladding process parameters of the outer cladding layer and the inner cladding layer are as follows: the laser power is 2600-2800w, the protective gas flow is 700/h-900L/h, the scanning speed is 2mm/s-4mm/s, and the spot diameter is 20 mm.

Technical Field

The invention belongs to the technical field of conveying pipelines, and particularly relates to a corrosion-resistant pipeline formed by laser cladding.

Background

The pipeline is an important part for conveying media, the pipeline is required to have excellent corrosion resistance, strength, explosion prevention and other functions for conveying oil, chemical wastewater and the like in the conventional pipeline, the general pipeline is integrally formed and directly cast, the hardness of the pipeline can be ensured, but the pipeline has excellent performance only by reprocessing the inner surface and the outer surface of the pipeline, so that the development of the corrosion-resistant pipeline which can reprocess the hardness of the pipeline and has excellent performance and is formed by laser cladding is urgently needed.

Disclosure of Invention

Technical problem to be solved

In order to overcome the defects that the prior art needs to have excellent corrosion resistance, strength, explosion resistance and other functions when oil, chemical wastewater and the like are conveyed in a conveying pipeline, common conveying pipelines are integrally formed and directly cast, and the hardness of the pipeline can be ensured, but the pipeline has excellent performance only by reprocessing the inner surface and the outer surface of the conveying pipeline, so that the invention provides the corrosion-resistant pipeline which can be reprocessed without affecting the hardness of the pipeline and has excellent performance and is cladded by using laser.

(II) technical scheme

The invention is realized by the following technical scheme: the invention provides a corrosion-resistant pipeline cladded by laser, wherein an inner layer is welded on the inner surface of a steel pipe, and an outer layer is cladded on the outer surface of the steel pipe;

the inner layer comprises a connecting steel ring; an inner-layer middle layer and an inner-layer cladding layer are sequentially cladded on the inner surface of the connecting steel ring from inside to outside; the connecting steel ring is in clearance fit with the steel pipe and welded on the inner surface of the steel pipe through two ends;

the outer layer comprises an outer layer middle layer and an outer layer cladding layer; an outer-layer middle layer and an outer-layer cladding layer are sequentially fused on the outer surface of the steel pipe from inside to outside;

the inner layer middle layer and the outer layer middle layer are made of nickel-based alloy powder;

the inner cladding layer and the outer cladding layer are made of a material prepared by mixing 30% of boron nitride powder and 70% of nickel-based alloy powder.

Furthermore, the thickness of the connecting steel ring, the inner-layer middle layer, the inner-layer cladding layer, the outer-layer middle layer and the outer-layer cladding layer is 1.5-3 mm.

A corrosion resistant pipe by laser cladding, characterized in that: the production process of the corrosion-resistant pipeline comprises the following steps:

i. pretreatment: preparing a steel pipe to be treated, and pretreating the steel pipe to be treated, namely cleaning impurities on the inner surface and the outer surface of the steel pipe;

outer cladding: preheating a pretreated steel pipe, heating to 150-200 ℃, uniformly coating nickel-based alloy powder on the outer surface of the steel pipe by adopting a synchronous powder feeding method, cladding the nickel-based alloy powder on the outer surface of the steel pipe by utilizing a laser cladding process to form an outer-layer middle layer, rapidly cooling the outer-layer middle layer to 200-250 ℃, uniformly coating 30% of boron nitride powder and 70% of nickel-based alloy powder on the outer surface of the outer-layer middle layer by utilizing synchronous powder feeding, cladding the 30% of boron nitride powder and 70% of nickel-based alloy powder on the outer surface of the outer-layer middle layer by utilizing the laser cladding process to form an outer-layer cladding layer, and naturally cooling;

inner layer fabrication: the steel strip is pretreated, namely the outer surface of the steel strip is cleaned of impurities, and after the treatment is finished, preheating a steel strip, heating to the temperature of 150-, coiling the steel strip by using a coiling machine to enable the inner layer cladding layer to face inwards to form a connecting steel ring;

forming a steel pipe: inserting the connecting steel ring into the steel pipe, and performing clearance fit and clearance fit between the connecting steel ring and the steel pipe, welding the two ends connected with the steel ring and the steel pipe, and finally, processing to enable the end parts of the connecting steel ring and the steel pipe to be ground flat after welding is finished, so that the corrosion-resistant pipeline is formed and further, and the laser cladding process parameters of the outer intermediate layer and the inner intermediate layer are as follows: the laser power is 1200-1800w, the protective gas flow is 700/h-900L/h, the scanning speed is 2mm/s-4mm/s, and the spot diameter is 20 mm.

Further, the laser cladding process parameters of the outer cladding layer and the inner cladding layer are as follows: the laser power is 2600-2800w, the protective gas flow is 700/h-900L/h, the scanning speed is 2mm/s-4mm/s, and the spot diameter is 20 mm.

(III) advantageous effects

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the boron nitride and the nickel-based alloy powder have excellent performances, so that the outer surface and the inner surface of the pipeline are reprocessed to form the cladding layer, the pipeline has excellent performances such as corrosion resistance, strength and explosion resistance, the connecting steel ring is in clearance fit with the steel pipe, and the connecting steel ring is welded on the inner surface of the steel pipe through two ends, so that the steel pipe can be directly cast and integrally formed, the process of processing and coiling the steel ring again is not needed, the hardness of the pipeline can be ensured, and the effect of reprocessing without influencing the hardness of the pipeline can be achieved.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic structural view of a corrosion-resistant pipe according to the present invention.

Fig. 2 is a schematic structural view of the outer layer of the present invention.

Fig. 3 is a schematic structural view of an inner layer of the present invention.

FIG. 4 is a flow chart of a process for producing corrosion resistant pipe according to the present invention.

Detailed Description

In the technical scheme:

in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example (b):

i. pretreatment: preparing a steel pipe to be treated, and pretreating the steel pipe to be treated, namely cleaning impurities on the inner surface and the outer surface of the steel pipe;

outer cladding: preheating a pretreated steel pipe, heating to 150 ℃, uniformly coating nickel-based alloy powder on the outer surface of the steel pipe by adopting a synchronous powder feeding method, cladding the nickel-based alloy powder on the outer surface of the steel pipe by utilizing a laser cladding process to form an outer-layer middle layer, rapidly cooling the outer-layer middle layer to 200 ℃, uniformly coating 30% of boron nitride powder and 70% of nickel-based alloy powder on the outer surface of the outer-layer middle layer by utilizing synchronous powder feeding, cladding the 30% of boron nitride powder and 70% of nickel-based alloy powder on the outer surface of the outer-layer middle layer by utilizing the laser cladding process to form an outer-layer cladding layer, and naturally cooling; the thickness of the outer layer middle layer and the outer layer cladding layer is 1.5 mm;

inner layer fabrication: the steel strip is pretreated, namely the outer surface of the steel strip is cleaned of impurities, and after the treatment is finished, preheating a steel strip, heating to the temperature of 150-, coiling the steel strip by using a coiling machine to enable the inner layer cladding layer to face inwards to form a connecting steel ring; the thicknesses of the connecting steel ring, the inner-layer middle layer and the inner-layer cladding layer are 1.5 mm;

forming a steel pipe: inserting the connecting steel ring into the steel pipe, fitting the connecting steel ring and the steel pipe in clearance fit, welding the two ends of the steel ring and the steel pipe, and finally,

and (4) the connecting steel ring and the end part of the steel pipe are ground flat by reprocessing, and then the corrosion-resistant pipeline is formed.

Boron nitride is broken in boron-nitrogen bond in hot concentrated alkali; the oxidation starts in the air above 1200 ℃; the melting point is 3000 ℃, and the sublimation is started when the temperature is slightly lower than 3000 ℃; decomposition begins at about 2700 ℃ under vacuum; slightly soluble in hot acid, insoluble in cold water, relative density 2.25; the compressive strength was 170 MPa. The maximum use temperature is 900 ℃ under the oxidizing atmosphere, and can reach 2800 ℃ under the inactive reducing atmosphere, but the lubricating property is poor at normal temperature; most of the properties of boron carbide are better than those of carbon materials; for hexagonal boron nitride: the material has the advantages of low friction coefficient, good high-temperature stability, good thermal shock resistance, high strength, high thermal conductivity, low expansion coefficient, high resistivity, corrosion resistance, microwave permeability or infrared ray permeability; the boron nitride has the advantages of chemical corrosion resistance and corrosion resistance by inorganic acid and water, and meanwhile, the nickel-based alloy powder has the advantages of wear resistance, corrosion resistance, rust resistance and the like, so that the outer surface and the inner surface of the pipeline are reprocessed to form a cladding layer, the pipeline has excellent performances of corrosion resistance, strength, explosion resistance and the like, the steel ring is in clearance fit with the steel pipe through the connecting steel ring, the connecting steel ring is welded on the inner surface of the steel pipe through two ends, the steel pipe can be directly cast and integrally formed, the process of processing and coiling the steel ring again is not needed, the hardness of the pipeline can be ensured, and the purpose of reprocessing without influencing the hardness of the pipeline.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. .