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Preparation method of pipe mold powder for nodular cast iron and application thereof

A technology of ductile iron and pipe mold powder, which is applied in the field of cast iron, can solve the problems of increased ductile iron pipe casting defects, uneven product composition, low product yield, etc., to prolong the decay time, refine grains, and graphite nucleation powerful effect

Active Publication Date: 2015-09-30
成都宏源铸造材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to avoid the melting process of difficult smelting, difficult powder recovery, high processing cost, and low product yield, domestic pipe mold powder manufacturers mostly adopt the cold processing process of directly mixing and compounding several raw materials after mechanical crushing. Pipe mold powder, the product composition is uneven, the melting point is inconsistent, the particle size is unreasonable, and the performance is unstable. It is competent in the production of large-diameter ductile iron pipes, but when it is used in the production of small-diameter ductile iron pipes, the amount of molten iron is greatly reduced. , leading to more casting defects of ductile iron pipes, and qualified products must be produced by using imported pipe mold powder. Therefore, the research and development of a high-efficiency and excellent pipe mold powder for casting ductile iron pipes is currently being used more and more widely in the market of ductile iron pipes. is very necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 (preparation pipe mold powder)

[0023] By weight percentage, 65% Si, 8% Ba, 1.6% Ca, 1% Al and 23.44% Fe are mixed evenly and placed in an electric furnace, remelted and cast into blocks, and the blocks are crushed into An alloy powder with an average particle diameter of 10 μm; the obtained above-mentioned alloy powder and an average particle diameter of 10 μm in a weight percentage of 1% Fe 3 o 4 Add the powder into the mixing container and mix it with alloy powder and Fe 3 o 4 The sodium silicate solution with 3% of the total weight of the powder is added together into a roller compacting device to form agglomerates, and finally crushed to an average particle size of 50 μm.

Embodiment 2

[0024] Embodiment 2 (preparation pipe mold powder)

[0025] By weight percentage, 68% Si, 5% Ba, 1.4% Ca, 1.4% Al and 23.7% Fe are mixed evenly and placed in an electric furnace, remelted and cast into blocks, and the blocks are crushed into An alloy powder with an average particle diameter of 30 μm; the obtained above-mentioned alloy powder and an average particle diameter of 30 μm in a weight percentage of 0.5% Fe 3 o 4 Add the powder into the mixing container and mix it with alloy powder and Fe 3 o 4 The sodium silicate solution with 5% of the total weight of the powder is added together into a roller compacting device to form agglomerates, and finally crushed to an average particle size of 100 μm.

Embodiment 3

[0026] Embodiment 3 (preparation pipe mold powder)

[0027] By weight percentage, 66% Si, 6% Ba, 1.5% Ca, 1.2% Al and 23.8% Fe are mixed evenly and placed in an electric furnace, remelted and cast into blocks, and the blocks are crushed into An alloy powder with an average particle diameter of 20 μm; the obtained above-mentioned alloy powder and an average particle diameter of 20 μm in a weight percentage of 1.5% Fe 3 o 4 Add the powder into the mixing container and mix it with alloy powder and Fe 3 o 4 The sodium silicate solution with 5% of the total weight of the powder is added together into a roller compacting device, pressed into agglomerates, and finally crushed to an average particle size of 80 μm.

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PUM

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Abstract

The invention discloses pipe powder for nodular cast iron. The formula of the pipe powder comprises the following components in percentage by weight: 62-70% of Si, 3-10% of Ba, 1-2% of Ca, 0.8-1.8% of Al, 0.5-1.5% of Fe3O4, the balance of Fe and inevitable microelements. According to the pipe powder for the nodular cast iron disclosed by the invention, the overall performance of the nodular cast iron can be improved, and the inoculation efficiency is improved.

Description

technical field [0001] The invention relates to the field of cast iron, in particular to a pipe mold powder for nodular cast iron and a preparation method thereof, as well as its application in the field of cast iron. Background technique [0002] Pipe mold powder is an important additive in the production of ductile iron pipes. It has the functions of protecting the pipe mold, facilitating demoulding, effectively reducing the degree of supercooling, inhibiting the formation of carbides, inoculating, eliminating pores and pinholes on the outer surface of the cast pipe, and spheroidizing , prolonging the service life of pipe mold powder and other functions, it is the last key material in the ductile iron pipe forming process, with high technical content and difficult production. Whether the quality of the pipe mold powder is good or not will directly affect the quality of the product, the qualified rate and the production efficiency. In order to avoid the melting process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C21C1/10C21C7/00
Inventor 韩岗马银强林志国
Owner 成都宏源铸造材料有限公司
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