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A kind of industrial preparation method of water-cooled metal type centrifugal ductile iron pipe

A technology of centrifugal nodular cast iron and metal type, which is applied in the whole preparation of water-cooled metal type centrifugal nodular cast iron pipe and the industrial preparation field of water-cooled metal type centrifugal nodular cast iron pipe, which can solve the problem of desulfurization, improper spheroidizing process, and the use of iron cast pipe Shorten the service life, affect the quality of cast iron pipes, etc., and achieve the effect of good application effect, high production efficiency and high appearance quality

Active Publication Date: 2016-07-13
SICHUAN CHUANJIAN PIPES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) In the production process, the treatment process of desulfurization, spheroidization and inoculation of molten iron is improper, which seriously affects the quality of cast iron pipes
[0006] (3) Improper operation in the shaping and coating process of cast iron pipes will easily shorten the service life of cast iron pipes

Method used

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  • A kind of industrial preparation method of water-cooled metal type centrifugal ductile iron pipe
  • A kind of industrial preparation method of water-cooled metal type centrifugal ductile iron pipe
  • A kind of industrial preparation method of water-cooled metal type centrifugal ductile iron pipe

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Effect test

Embodiment 1

[0045] The existing patent documents related to the preparation of cast iron pipes include CN102000797A, CN101921945A, CN102981492A, etc., which include the source of molten iron, spheroidizing and annealing of molten iron involved in the production process of cast iron pipes. However, for the production process of cast iron pipes, Its complete preparation process includes a series of production steps from smelting, molten iron spheroidizing inoculation treatment, casting, heat treatment to shaping and coating, combined with the current situation of continuous growth in demand for cast iron pipes in my country, in order to obtain stable high-quality cast iron To meet the urgent needs of the current cast iron pipe industry, the present invention proposes an industrial preparation method for water-cooled metal type centrifugal nodular cast iron pipes. And the preparation process of obtaining the finished cast iron pipe after the coating process.

[0046] In this example, the specif...

Embodiment 2

[0057] The difference between this embodiment and Embodiment 1 is that: in step (2), the spheroidization process involved in this embodiment is the flushing spheroidization method, figure 1 It is a schematic diagram of the structure of the spheroidization package, such as figure 1 as shown, figure 1 In the middle right groove from bottom to top are nodularizer and inoculant, figure 1The direction of the arrow symbol in the middle is the direction of the molten iron rushing in. In this method, the molten iron prepared in step (1) is aimed at the side of the embankment where no nodulizer is added, and the iron is tapped at a rate of 25kg / s. The amount of iron reaches 1 / 2 of the height of the spheroidizing ladle, stop for 3s, and then tap iron at a tapping rate of 80kg / s until the ladle is full to obtain spheroidized molten iron. The spheroidized molten iron contains 0.035% magnesium, which The fluctuation value of carbon equivalent is 0.03%.

Embodiment 3

[0059] The difference between this embodiment and Embodiment 1 is that: in step (2), the spheroidization process involved in this embodiment is the flushing spheroidization method, figure 2 It is a schematic diagram of the structure of the spheroidization package, such as figure 2 as shown, figure 2 In the middle right groove from bottom to top are nodularizer and inoculant, figure 2 The direction of the arrow symbol in the middle is the direction of the molten iron rushing in. In this method, the molten iron prepared in step (1) is aimed at the side of the embankment where no nodulizer is added, and the iron is tapped at a rate of 35kg / s. The amount of iron reaches 1 / 3 of the height of the spheroidizing ladle, pause for 5s, and then tap iron at a tapping rate of 120kg / s until the ladle is full to obtain spheroidized molten iron. The spheroidized molten iron contains 0.035% magnesium, which The fluctuation value of carbon equivalent is 0.02%.

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Abstract

The invention discloses an industrial preparing method of a water-cooling metal mold centrifugal nodular cast iron pipe. According to the method, pig iron is used, the technologies of molten iron preparing, molten iron nodulizing, centrifugal casting, annealing, shaping and coating are carried out, and then the finished cast iron pipe is obtained. The preparing method is suitable for preparing the high-quality metal mold centrifugal nodular cast iron pipe of DN80-1000 mm. The preparing process comprises a series of operation procedures such as molten iron preparing, molten iron nodulizing, centrifugal casting, annealing, shaping and coating, the preparing technology is simple, the prepared cast iron pipe has the advantages of being high in appearance quality, fine in material structure, high in production efficiency, long in service life and the like, and compared with an existing steel pipe and an existing gray iron pipe, the water-cooling metal mold centrifugal nodular cast iron pipe has better corrosion-resisting performance and tensile performance.

Description

technical field [0001] The invention relates to an industrial preparation method of a water-cooled metal-type centrifugal ductile iron pipe, specifically relates to the entire preparation process of the water-cooled metal-type centrifugal ductile iron pipe, and belongs to the technical field of cast iron pipe preparation. Background technique [0002] Since the 1990s, my country has produced centrifugal ductile iron pipes with a diameter of DN2600mm and a length of 8000mm by using the centrifugal casting method of internal spray paint, realizing the mass production of centrifugal ductile iron pipes. Of course, due to the excellent performance of centrifugal ductile iron pipes , was quickly adopted by the water supply system, and has become the preferred material for water supply pipes, and like other industrially developed countries, it has completed the transformation from gray cast iron to ductile iron, from continuous casting process to centrifugal casting process in a shor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/04B22D1/00B22D13/00C21C1/10B22D13/10
Inventor 李晓兵许顺鲜其祥刘杲
Owner SICHUAN CHUANJIAN PIPES
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