A kind of manufacturing method of double-layer composite seamless pipe of the same steel type

A double-layer composite and manufacturing method technology, which is applied in the manufacture of double-layer composite seamless pipes and the field of manufacturing double-layer composite seamless pipes of the same steel type, can solve the problem of poor pull-off resistance and gap between double-layer composite pipes Large and other problems, to achieve the effect of ensuring stability, excellent resistance to pull-off, and small pipe seams

Active Publication Date: 2020-05-05
JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is how to solve the problems of large seam gap and poor pull-off resistance of the double-layer composite pipe, overcome the shortcomings of the prior art, and provide a double-layer composite seamless pipe of the same steel type The manufacturing method, which specifies the final cold working deformation, heat treatment method, heat treatment system, and composite deformation process of the parent pipe before compounding, to produce a product with high dimensional accuracy, good surface quality, stable structure and performance, and strong practicability. Layer composite seamless pipe, this method also breaks through the limitations of the processing method of double layer composite seamless pipe of the same steel type

Method used

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  • A kind of manufacturing method of double-layer composite seamless pipe of the same steel type
  • A kind of manufacturing method of double-layer composite seamless pipe of the same steel type
  • A kind of manufacturing method of double-layer composite seamless pipe of the same steel type

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Experimental program
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Effect test

Embodiment 1

[0041] A method for manufacturing a double-layer composite seamless pipe of the same steel type provided in this embodiment specifically includes the following steps:

[0042] (1) Peeling and cutting off the round steel;

[0043] (2) Pierce the round steel processed in step (1) with a Φ60mm thermal piercer to obtain a capillary of a certain specification;

[0044] (3) Pickling the capillary obtained in step (2) to remove scale;

[0045] (4) Cold rolling the capillary tube after step (3), and then heat treatment, repeating this step until it reaches the specifications before the inner layer tube and the outer layer tube are combined;

[0046] (5) Put the outer layer tube obtained in step (4) outside the inner layer tube, perform compound cold drawing, and then perform bright heat treatment;

[0047] (6) straightening the pipe obtained in step (5);

[0048] (7) The steel pipe obtained in step (6) is subjected to direct management inspection and surface inspection of finished ...

Embodiment 2

[0050] A method for manufacturing a double-layer composite seamless pipe of the same steel type provided in this embodiment specifically includes the following steps:

[0051] (1) Peel and cut the round steel, and the peeling amount is 1mm on one side;

[0052](2) Pierce the round steel processed in step (1) with a Φ60mm thermal piercer, the piercing temperature is controlled at 1080-1120°C, and the size of the capillary after piercing is Φ80×6.5mm;

[0053] (3) Pickling the capillary obtained in step (2) to remove scale;

[0054] During pickling, the pickling temperature is controlled at 60°C, and the pickling time is 50 minutes. The acid solution includes, by mass percentage: 6% hydrofluoric acid, 12% nitric acid, and water as the balance. The sum of the above components is 100%;

[0055] (4) Cold rolling the capillary treated in step (3), first cold rolling the capillary to a specification of Φ57×3.5mm, and then bright heat treatment, the temperature of the bright heat tre...

Embodiment 3

[0063] A method for manufacturing a double-layer composite seamless pipe of the same steel type provided in this embodiment specifically includes the following steps:

[0064] (1) Peel and cut the round steel, and the peeling amount is 1mm on one side;

[0065] (2) Pierce the round steel processed in step (1) with a Φ60mm thermal piercer, the piercing temperature is controlled at 1080-1120°C, and the size of the capillary after piercing is Φ80×6.5mm;

[0066] (3) Pickling the capillary obtained in step (2) to remove scale;

[0067] During pickling, the pickling temperature is controlled at 50°C, and the pickling time is 40 minutes. The acid solution includes, by mass percentage: 6% hydrofluoric acid, 12% nitric acid, and water as the balance. The sum of the above components is 100%;

[0068] (4) Cold rolling the capillary treated in step (3), first cold rolling the capillary to a specification of Φ57×3.5mm, and then bright heat treatment, the temperature of the bright heat tr...

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Abstract

The invention discloses a manufacturing method of same-steel double-layer composite seamless pipe. The manufacturing method comprises the following steps: (1) peeling and cutting round steel; (2) punching the round steel by using a thermal puncher, thus obtaining capillary pipes; (3) carrying out acid pickling on the capillary pipes; (4) carrying out cold rolling on the capillary pipes, then carrying out thermal treatment, and repeating the step until reaching specifications before an inner pipe is combined with an outer pipe; (5) sleeving the outer pipe obtained in step (4) outside the innerpipe, carrying out compounding and cold drawing, and then carrying out bright heat treatment; (6) straightening an obtained pipe; (7) carrying out finished product straight pipe physicochemical detection and surface examination on the obtained steel pipe, and packaging and storing qualified products in a warehouse after cutting the qualified products in fixed length and identifying the qualified products. According to the manufacturing method disclosed by the invention, by stipulating the final cold machining deformation, the thermal treatment mode, the thermal treatment system and the composite deformation technology of a mother pipe before combining, a double-layer pipe which is high in size accuracy, good in surface quality, stable in structure property and strong in practicability canbe produced, the problems of larger pipe seam clearance and poorer pulling resistance of a double-layer composite pipe are solved, and the limit of a machining mode of the double-layer composite pipeis also broken through.

Description

technical field [0001] The invention belongs to the technical field of material processing, and relates to a method for manufacturing a double-layer composite seamless pipe, in particular to a method for manufacturing a double-layer composite seamless pipe of the same steel type. Background technique [0002] With the development of industrial technology, the requirements for heat exchangers in petroleum, chemical, energy and nuclear industries are constantly increasing, which makes the structure of heat exchange equipment more and more complicated, and the structure volume is getting larger and larger. In order to improve the heat exchange tube The anti-wear or anti-corrosion ability meets the requirements of structural rigidity, strength and stability at the same time. The heat exchange tube has developed from the original single metal tube to the double-layer tube. In order to further improve the heat transfer efficiency, a double-layer heat exchange tube has been formed. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06
CPCB21C37/06
Inventor 丛生达李宏吴青松高佩罗煦
Owner JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD
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