Non-tombarthite ferrite ball iron and preparing method thereof

A technology of ferrite and nodular iron, which is applied in the field of preparation of ferrite nodular iron, can solve the problems of many inclusions, difficult inoculation treatment, high safety and reliability requirements for pressure-added magnesium ladle, and achieves the effect of simple and easy preparation method

Active Publication Date: 2010-07-14
JIANGSU FAW FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high amount of residual magnesium and many inclusions, it also affects the improvement of some properties
On the other hand, it is difficult to popular

Method used

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  • Non-tombarthite ferrite ball iron and preparing method thereof
  • Non-tombarthite ferrite ball iron and preparing method thereof
  • Non-tombarthite ferrite ball iron and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] After 10 tons of molten iron is desulfurized outside the cupola, it is added to the electric furnace through a transfer package to increase the temperature, and the temperature of the molten iron is raised to 1450 ℃ out of the electric furnace, and the spheroidization and inoculation treatment are carried out in the ladle;

[0022] Spheroidizing and inoculation treatment: Pour a total of 5 tons of heated molten iron into the ladle for spheroidization and inoculation treatment. The spheroidizing reaction temperature is 1400°C. The amount of nodulizer added is determined according to the weight of the poured molten iron, and the spheroidizing The weight of the agent is 1.1% of the weight of the molten iron, and the added amount of the spheroidizing agent is 55kg. The weight percentage of Mg in the spheroidizing agent is 6.0%, which is 3.3kg, and the weight percentage of Si is 40.0%. 22kg, the rest is iron. According to the weight of the poured molten iron, ...

Example Embodiment

[0028] Example 2

[0029] 10 tons of molten iron is desulfurized outside the cupola, and then added to the electric furnace through a transfer package to increase the temperature, and the temperature of the molten iron is raised to 1470°C out of the electric furnace, and then spheroidizing and inoculating in the ladle;

[0030] Spheroidizing and inoculation treatment: Pour a total of 5 tons of heated molten iron into the ladle for spheroidization and inoculation treatment. The spheroidizing reaction temperature is 1420℃. The amount of nodulizer added is determined according to the weight of the poured molten iron. The weight of the agent is 1.2% of the weight of the molten iron, the added amount of the nodulizer is 60kg, the weight percentage of Mg in the nodulizer is 6.0%, which is 3.6kg, and the weight percentage of Si is 40.0%. 24kg, the rest is iron. According to the weight of the poured molten iron, weigh 0.3% 75SiFe of the molten iron as a covering, totaling 15kg, add the no...

Example Embodiment

[0036] Example 3

[0037] 10 tons of molten iron is desulfurized outside the cupola, and then added to the electric furnace through a transfer package to increase the temperature. The temperature of the molten iron is raised to 1480°C and discharged from the furnace, and the spheroidization and inoculation are performed in the ladle;

[0038] Spheroidization and inoculation treatment: Pour 5 tons of molten iron after heating and carbonization treatment into the ladle for spheroidization and inoculation treatment. The spheroidization reaction temperature is 1430°C. The amount of nodulizer is determined according to the weight of the poured molten iron The weight of the spheroidizing agent is 1.3% of the weight of the molten iron, which is 65kg, the weight percentage of control Mg is 9.0%, which is 5.85kg, the weight percentage of Si is 46.0%, which is 29.9kg, and the rest is iron. According to the weight of the poured molten iron, weigh 0.2% of the 75SiFe of the molten iron as a cov...

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Abstract

The invention relates to a ferrite ball iron, and the invention also discloses a technic by adopting a cutting-in method to prepare the ferrite ball iron. According to the technical scheme, the ferrite ball iron comprises the following compositions by mass percent: 3.6 percent-3.9 percent of C, 1.7 percent-3.0 percent of Si, 0.1 percent-0.4 percent of Mn, 0.035 percent-0.045 percent of Mg, tombarthite< 0.001 percent, and the impurity elements are P and S, wherein the P is controlled to be less than or equal to 0.040 percent, and the S is controlled to be less than or equal to 0.012 percent, and the rest is iron. The elongation and low-temperature impact-resistance value of the ferrite ball iron reach or are over the standard required value, and the extension strength and yield strength also reach the requirement, and the preparing method is simple and easy.

Description

technical field [0001] The invention discloses a process for preparing ferrite nodular iron using a rare earth-free nodulizer. Background technique [0002] Efficient, environmentally friendly, safe and renewable wind energy is one of the important directions of my country's future energy development. Large-scale wind power hubs and bases are made of ferritic ductile iron castings. Due to the slow cooling rate and long solidification time of these castings, graphite balls are prone to distortion, which greatly reduces the toughness and plasticity of ductile iron parts. As the basis for judging whether the material is qualified, not only the performance must meet the requirements, but also higher requirements for the graphite morphology and matrix structure. This prompts us to improve graphite morphology and achieve performance through smelting process research. [0003] (1) The selection of nodulizer should be based on the different smelting equipment, that is, the tapping...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08B22D1/00
Inventor 俞旭如苏敏刘鑫王秋新李川度方怡蔡佳佳
Owner JIANGSU FAW FOUNDRY
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