Molten iron inoculation process for cast iron

A technology of molten iron and process, which is applied in the field of inoculation process of molten iron for cast iron, can solve the problems of low tensile strength, unstable products, easy white spots, etc., achieve long-term inoculation, prevent the defects of white spots, and prevent the phenomenon of inoculation decline Effect

Inactive Publication Date: 2017-01-04
TIANJIN ZHONGDA PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, these products have shortcomings such as low tensile strength and easy to produce white spots, resulting in unstable products and cannot meet the requirements of some machine castings that require high hardness. Therefore, in practice, the molten iron inoculation process still needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A molten iron inoculation process for cast iron is characterized in that the specific steps of the method adopted are as follows:

[0014] (1) Adopt dam-type ductile iron ladle for spheroidization, add 0.3% of the molten iron weight in the spheroidization ladle with an inoculant whose weight percentage composition is as follows: Si: 20%, Mn: 4%, Ca : 6%, Ba: 1%, Al: 2%, Sr: 0.1%, the balance is Fe. The preparation steps are as follows: 20% Si, 4% Mn, 6% Ca, 1% Ba, 2% Al, 0.1% Sr and the remainder Fe alloy are mixed uniformly and crushed; use an intermediate frequency induction furnace for smelting, the smelting temperature is set in the range of 1480 ℃, the smelting time is 10 minutes, cooling, by adding Calcium silicate, compress the above mixture in a rolling device to make it mixed into agglomerates; crush the aforesaid agglomerates into particles with a size of 5 mm, and sieve out the inoculant with a particle size of 5 mm;

[0015] (2) Tundish inoculation, add 0.1% of ...

Embodiment 2

[0018] A molten iron inoculation process for cast iron is characterized in that the specific steps of the method adopted are as follows:

[0019] (1) The dam type ductile iron ladle is used for spheroidization, and 0.5% of the weight of the molten iron is added into the spheroidizing ladle. The composition of the inoculant by weight is as follows: Si: 40%, Mn: 6%, Ca : 10%, Ba: 3%, Al: 4%, Sr: 2%, the balance is Fe. The preparation steps are as follows: 40% Si, 6% Mn, 10% Ca, 3% Ba, 4% Al, 2% Sr and the remainder of Fe alloy are mixed uniformly and crushed; it is smelted in an intermediate frequency induction furnace, the smelting temperature is set in the range of 1500 ℃, the smelting time is 10 minutes, cooling, and adding Potassium silicate, compress the above mixture in a rolling device to make it mix into agglomerates; crush the aforesaid agglomerates into particles with a size of 10 mm, and sieving out an inoculant with a particle size of 10 mm;

[0020] (2) Tundish inoculat...

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Abstract

The invention provides a molten iron inoculation process for cast iron. A method adopted by molten iron inoculation process comprises the following steps: a dam-type ductile iron ladle is adopted for spheroidization, and an inoculant of which the weight accounts for 0.3-0.5% of that of molten iron is added into the spheroidized ladle; an intermediate ladle is inoculated, that is, the inoculant of which the weight accounts for 0.1-0.3% of that of the molten iron is added into the intermediate ladle, and the treated molten iron is passed into the next step after the inoculant is completely molten; and the molten iron treated in the previous step is added into a pouring ladle, and the inoculant of which the weight accounts for 0.05-0.35% of that of the molten iron is added. According to the molten iron inoculation process, the dam-type ductile iron ladle is adopted for spheroidization, thereby effectively preventing an inoculation fading phenomenon and overcoming a defect of white cast iron; the intermediate ladle is adopted for inoculation, thereby achieving long-acting inoculation of the molten iron; and accordingly, the tensile strength and the product stability can be improved, and the requirements for several high-hardness machinery castings can be met.

Description

Technical field [0001] The invention relates to the technical field of molten iron production for cast iron, in particular to a molten iron inoculation process for cast iron. Background technique [0002] A small amount of inoculant is added to cast iron molten iron to improve the nucleation conditions, so that the crystallization will be transformed according to the iron-graphite stable system, so as to prevent white mouth from promoting graphitization, reduce hardness, improve processing performance, uniform structure, reduce wall thickness sensitivity, and refine grain Improve mechanical properties and improve other performance processing methods. At present, these products have shortcomings such as low tensile strength and easy to produce white mouth, which makes the products unstable and cannot meet the requirements of some machine castings that require high hardness. Therefore, in practice, the molten iron inoculation process still needs to be improved. Summary of the inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10C22C33/08C22C38/02C22C38/04C22C38/06B22D1/00
CPCC21C1/105B22D1/00C22C33/08C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 孙士俊
Owner TIANJIN ZHONGDA PRECISION MACHINERY
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