Silicon solid melt reinforced ferrite nodular cast iron and preparation technique thereof

A ductile iron and ferrite technology is applied in the field of silicon solid solution strengthened ferritic ductile iron and its preparation. The effect of simple preparation method and easy steps

Active Publication Date: 2016-10-12
JIANGSU FAW FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the performance requirements of the core cast iron components used in wind power projects are relatively high, and the materials prepared by the existing process cannot meet the application requirements, and provide a silicon solid-solution strengthened ferritic nodular cast iron and its preparation Process, by selecting high-quality raw materials, adjusting the content of carbon, silicon, manganese in molten iron, and the reasonable matching of cerium and antimony, after pretreatment, spheroidizing inoculation treatment, to obtain silicon solid-solution strengthened ferritic nodular cast iron—QT580-13

Method used

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  • Silicon solid melt reinforced ferrite nodular cast iron and preparation technique thereof

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Experimental program
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Effect test

Embodiment 1

[0021] The preparation process of QT580-13 ferritic ductile iron includes the following steps:

[0022] (1) Selection of raw materials: by weight, select 20 parts of pig iron with a phosphorus content of less than or equal to 0.035%, a sulfur content of less than or equal to 0.020%, 15 parts of manganese content of less than or equal to 0.1%, a phosphorus content of less than or equal to 0.030%, and a sulfur content of less than or equal to 0.030%. 0.030% scrap steel, then packaged and formed, 65 parts of the company's wind power casting ductile iron return material, and melted in an electric furnace, adjusted the chemical composition, heated to 1430 ~ 1480 ℃, until all melted into molten iron;

[0023] (2) configuration of raw materials in the spheroidizing bag: in terms of the mass of molten iron obtained in step (1), put nodularizing agents A and B in the spheroidizing bag, and the additions of spheroidizing agents A and B are 0.55 of the molten iron weight. %, compact; eve...

Embodiment 2

[0034] The preparation process of QT580-13 ferritic ductile iron includes the following steps:

[0035] (1) Selection of raw materials: In parts by weight, select 60 parts of pig iron with a phosphorus content of less than or equal to 0.035%, sulfur content of less than or equal to 0.020%, 35 parts of manganese content of less than or equal to 0.1%, phosphorus content of less than or equal to 0.030%, and sulfur content of less than or equal to 0.030%. 0.030% scrap steel, then packaged and formed, 15 parts of the company's wind power casting ductile iron return material, and melted in an electric furnace, adjusted the chemical composition, heated to 1430 ~ 1480 ℃, until all melted into molten iron;

[0036] (2) configuration of raw materials in the spheroidizing bag: in terms of the quality of the molten iron obtained in step (1), put nodularizing agents A and B in the spheroidizing bag, and the additions of the spheroidizing agents A and B are 0.60 of the molten iron weight. %...

Embodiment 3

[0047] The preparation process of QT580-13 ferritic ductile iron includes the following steps:

[0048] (1) Selection of raw materials: In parts by weight, select 65 parts of pig iron with a phosphorus content of less than or equal to 0.035%, a sulfur content of less than or equal to 0.020%, 25 parts of manganese content of less than or equal to 0.1%, a phosphorus content of less than or equal to 0.030%, and a sulfur content of less than or equal to 0.030%. 0.030% scrap steel, then packaged and formed, 10 parts of the company's wind power casting ductile iron return material, and melted in an electric furnace, adjusted the chemical composition, heated to 1430 ~ 1480 ℃, until all melted into molten iron;

[0049] (2) configuration of raw materials in the spheroidizing bag: in terms of the mass of molten iron obtained in step (1), put nodularizing agents A and B in the spheroidizing bag, and the additions of spheroidizing agents A and B are 0.50 of the molten iron weight. %, com...

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Abstract

The invention relates to silicon solid melt reinforced ferrite nodular cast iron and a preparation technique thereof. The silicon solid melt reinforced ferrite nodular cast iron is composed of, by weight, 3.05-3.30% of C, 3.80-4.00% of Si, 0.15-0.25% of Mn, 0.035-0.050% of Mg, 0-0.035% of P, 0-0.015% of S, 0.0030-0.0040% of Ce, 0.0045-0.0055% of Sb and the balance iron. In the preparation process, high-quality pig iron and scrap steel are selected, molten iron is melted through an electric furnace, the content of carbon, the content of silicon and the content of manganese are controlled, a certain quantity of pretreating agents, nodulizing agents A, nodulizing agents B and inoculants are added into spheroidizing tundishes for molten iron treatment, a certain amount of antimony is added at the same time so as to adjust the content of cerium, and the spheroidizing effect is good; and inoculant blocks are embedded in a sprue basin, stream inoculation devices are arranged near the sprue basin for stream inoculation, and slagging-off and casting are conducted. The preparation method is simple, the tensile strength, the yield strength and the ductility of the silicon solid melt reinforced ferrite nodular cast iron obtained through preparation reach and exceed the required values, and the impact value at the temperature of -20 DEG C under the condition that no V-shaped notch exists also meets the requirements, so that the metallographical effect is good.

Description

technical field [0001] The invention relates to a silicon solid solution strengthening ferrite ductile iron and a preparation process thereof, and belongs to the technical field of preparation of ferrite ductile iron. Background technique [0002] Due to the development of wind power technology, wind turbine projects are being strongly supported around the world. With the development of wind turbine projects around the world, as the core components of wind power projects: hubs, bases, bearing seats and other parts, the casting materials selected are also changing. Many well-known wind turbine manufacturers in the world have proposed the use of solution-strengthened ferritic ductile iron materials. SUMMARY OF THE INVENTION [0003] The purpose of the invention is to solve the problem that the core cast iron components used in wind power projects have high performance requirements, and the materials prepared by the existing technology cannot meet the application requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/10C21C1/10
CPCC21C1/10C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 刘鑫俞旭如李川度孙春晖马建照李平张森林
Owner JIANGSU FAW FOUNDRY
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