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Inoculant for ferritic nodular cast iron and preparation method of inoculant

A nodular cast iron and inoculant technology, which is applied in the field of ferritic nodular cast iron inoculants and its preparation, can solve the problems of scrapped castings and unstable inoculation effects, and achieve low usage and good inoculation effects

Inactive Publication Date: 2013-06-12
SHANDONG HUIFENG CASTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of ferrosilicon inoculants still accounts for more than 80% of the total amount of cast iron inoculants, resulting in very unstable inoculation effects and often scrapped castings

Method used

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  • Inoculant for ferritic nodular cast iron and preparation method of inoculant

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preparation example Construction

[0021] A method for preparing an inoculant for ferritic nodular cast iron. According to the chemical composition and mass percentage of the above-mentioned inoculant for ferritic nodular cast iron, corresponding raw materials are prepared for deployment, and then the prepared raw materials are put into a crucible to melt and refine , and finally pouring, cooling, and crushing and granulation.

[0022] A method for using an inoculant for ferritic nodular cast iron, using two inoculation treatments: one inoculation at the bottom of the bag to cover the surface of the nodulizer with the inoculant, the addition of the above-mentioned inoculant for ferritic nodular cast iron is 0.10- 0.15wt%; the top is covered with a steel plate; the secondary inoculation adopts flow inoculation, and the above-mentioned inoculant for ferritic ductile iron is added in an amount of 0.80-0.85wt%.

Embodiment 1

[0023] Example 1 Formula: The mass percent of the inoculant for ferritic ductile iron is: Si: 65%, Bi: 5.0%, Ca: 4.0%, Ba: 2.9%, Al<0.5%, Ti<0.05%, Mn <0.4%, S<0.02%, P<0.05%, the balance is iron.

Embodiment 2

[0024] Example 2 Formula: The mass percentage of the inoculant for ferritic ductile iron is: Si: 70%, Bi: 4.0%, Ca: 2.0%, Ba: 1.0%, Al<0.5%, Ti<0.05%, Mn< 0.4%, S<0.02%, P<0.05%, the balance is iron.

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Abstract

The invention discloses an inoculant for a ferritic nodular cast iron and a preparation method of the inoculant, and the inoculant can be used for solving the problems that the nodular graphite cast iron prepared by an existing inoculant is less in graphite nodule quantity, low in ferrite content and poor in extensibility and impact ductility. The inoculant for the ferritic nodular cast iron comprises the following chemical compositions in percentage by mass: 65-70% of Si, 1.0-5.0% of Bi, 2.0-5.0% of Ca, 1.0-4.0% of Ba, less than 0.5% of Al, less than 0.05% of T1, less than 0.4% of Mn, less than 0.02% of S, less than 0.05% of P, and the balance of Fe; and the inoculant is prepared by smelting and granulating the raw materials. The ferritic nodular cast iron produced by using the inoculant can accelerate graphite nucleation, reduce the chilling tendency, increase the graphite nodule quantity, improve the graphite nodule element integration action, further improve the ferrite content under a cast condition, and improve the extensibility and impact ductility of ductile iron.

Description

technical field [0001] The invention relates to the technical field of ferritic nodular iron production, in particular to an inoculant for ferritic nodular cast iron and a preparation method thereof. Background technique [0002] The inoculant is a kind of inoculant that can promote graphitization, reduce the tendency of whitening, improve the morphology and distribution of graphite, increase the number of eutectic groups, and refine the matrix structure. It has a good effect in a short time after inoculation treatment. It is mainly suitable for general or post-instantaneous pregnancy in various situations. In the production of ductile iron, inoculation is an essential process due to the relatively large tendency of supercooling. The main function of using inoculants for inoculation treatment is to increase the number of graphite nodules in ductile iron, improve their roundness, refine graphite nodules, prevent spheroidization recession, reduce the tendency of white mouth, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C21C1/10
Inventor 刘宪民刘明亮焦守民郭宏涛周长猛
Owner SHANDONG HUIFENG CASTING TECH
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