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Method for preparing centrifugal nodular cast iron pipe

A technology of centrifugal nodular cast iron and cast iron pipes, which is applied to the device and coating of the surface coating liquid, which can solve the problems of desulfurization, improper spheroidizing process, shortened service life of iron cast pipes, and affecting the quality of iron cast pipes , to achieve the effect of high appearance quality, stable molten iron composition and high production efficiency

Active Publication Date: 2015-04-01
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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  • Method for preparing centrifugal nodular cast iron pipe
  • Method for preparing centrifugal nodular cast iron pipe
  • Method for preparing centrifugal nodular cast iron pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment is suitable for preparing a centrifugal ductile iron pipe whose specification is DN500mm, and its preparation steps are as follows:

[0048] (A) Using a blast furnace or a cupola to smelt pig iron at high temperature to obtain molten iron with a sulfur content of 0.02% and a carbon equivalent fluctuation of 0.1%;

[0049] (B) sending the molten iron obtained in step (A) to the spheroidizing station, figure 1 , figure 2 is a schematic diagram of the structure of the spheroidization station, such as figure 1 , figure 2 As shown, the spheroidizing bag 3 is sent into the spheroidizing chamber 2 of the spheroidizing station by the electric flat car 4, and the molten iron is spheroidized by the spheroidizing wire feeding mechanism 1 of the spheroidizing station. The molten iron obtained after melting contains: 3.2% carbon, 0.008% sulfur, 2.3% silicon, 0.07% phosphorus, 0.04% magnesium, 0.32% manganese, and 0.025% rhenium. Nodulizing agent and inoculant, ...

Embodiment 2

[0055] The difference between this embodiment and Embodiment 1 is that the spheroidization process involved in this embodiment is the flushing spheroidization method, and the structure of the spheroidization package 3 is as follows: image 3 As shown, the bottom of the spheroidizing bag 3 and one side of the dam of the spheroidizing bag form a groove 5 for accommodating the nodulizer and the inoculant. and inoculant, in actual operation, the molten iron is tapped by the spheroidizing wire feeding mechanism 1 along the spheroidizing ladle dam on the side where the groove 5 is not formed, namely image 3 indicated by the arrow symbol.

[0056] The spheroidizing agent used in this embodiment is a rare earth magnesium silicon spheroidizing agent, which contains 20% rare earth, 25% magnesium and 50% silicon by weight percentage.

[0057] The inoculant used in this embodiment is ferrosilicon or silicon-calcium alloy, and the inoculant contains 50% silicon and 1.5% calcium by weight...

Embodiment 3

[0059] The difference between this embodiment and Embodiment 1 is that the spheroidization process involved in this embodiment is the flushing spheroidization method, and the structure of the spheroidization package 3 is as follows: Figure 4 As shown, the bottom of the spheroidizing bag 3 and one side of the dam of the spheroidizing bag form a groove 5 for accommodating the nodulizer and the inoculant. and inoculant, in actual operation, the molten iron is tapped by the spheroidizing wire feeding mechanism 1 along the spheroidizing ladle dam on the side where the groove 5 is not formed, namely Figure 4 indicated by the arrow symbol.

[0060] The spheroidizing agent used in this embodiment is a rare earth magnesium silicon spheroidizing agent, which contains 19% rare earth, 22% magnesium and 48% silicon by weight percentage.

[0061] The inoculant used in this embodiment is ferrosilicon or silicon-calcium alloy, and the inoculant contains 47% silicon and 1.4% calcium by weig...

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Abstract

The invention discloses a method for preparing a centrifugal nodular cast iron pipe. The method discloses the preparation process of the centrifugal nodular cast iron pipe of high quality, the preparation process comprises a series of operation processes of molten iron preparation, nodulizing of molten iron, centrifugal casting, annealing treatment, pipe body shaping and coating protection and the like. The method is suitable for preparation of cast iron pipes of the specification of DN 80-1000 mm, the application range is wide, and the preparation process is simple. The cast iron pipe prepared through the method has the characteristics of being high in appearance quality, fine in material structure, high in production efficiency, long in service life and the like, and compared with existing steel pipes and gray iron pipes, the cast iron pipe prepared through the method has better decay resistance and tensile property.

Description

technical field [0001] The invention relates to a preparation method of a centrifugal ductile iron pipe, specifically relates to a preparation process of a centrifugal ductile iron pipe, and belongs to the technical field of preparation of cast iron pipes. 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 short period of time It can be said that since the 1990s, my country's ...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C21C1/10B22D13/02B22D27/20B05D1/36
Inventor 李晓兵许顺鲜其祥刘杲
Owner SICHUAN CHUANJIAN PIPES
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