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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 popularize and apply due to factors such as high safety and reliability requirements for pressure-added magnesium bags, and difficult inoculation treatment after spheroidization.

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

Embodiment 1

[0021] 10 tons of molten iron is desulfurized outside the cupola and then fed into the electric furnace through the transfer ladle to raise the temperature. The temperature of the molten iron is raised to 1450°C and exits the electric furnace. Spheroidization and inoculation are carried out in the ladle;

[0022] Spheroidization and inoculation treatment: Pour a total of 5 tons of heated molten iron into the ladle for spheroidization and inoculation treatment. The temperature of the spheroidization reaction is 1400°C. The weight of agent is 1.1% of the weight of molten iron, and the add-on amount of nodulizer is 55kg, adopts the weight percentage of Mg in the nodulizer to be 6.0%, calculate 3.3kg, the weight percentage of Si is 40.0%, calculate 22kg, the rest is iron. And according to the weight of the poured molten iron, weigh 75SiFe with 0.3% of the molten iron weight as a covering, 15kg in total, add the spheroidizing agent to the molten iron by flushing, and the spheroidiz...

Embodiment 2

[0029] 10 tons of molten iron is desulfurized outside the cupola and then fed into the electric furnace through the transfer ladle to raise the temperature. The temperature of the molten iron is raised to 1470°C and exits the electric furnace. Spheroidization and inoculation are carried out in the ladle;

[0030] Spheroidization and inoculation treatment: Pour a total of 5 tons of heated molten iron into the ladle for spheroidization and inoculation treatment. The temperature of the spheroidization reaction is 1420°C. The weight of agent is 1.2% of the weight of molten iron, and the add-on amount of nodulizer is 60kg, adopts the weight percent content of Mg in the nodulizer to be 6.0%, calculates 3.6kg, and the weight percentage content of Si is 40.0%, calculates 24kg, the rest is iron. And according to the weight of the poured molten iron, weigh 75SiFe with 0.3% of the molten iron weight as a covering, 15kg in total, add the spheroidizing agent to the molten iron by flushing,...

Embodiment 3

[0037] 10 tons of molten iron is desulfurized outside the cupola and then added to the electric furnace through the transfer ladle to raise the temperature. The temperature of the molten iron is raised to 1480°C to be released from the furnace, and the spheroidization and inoculation are carried out in the ladle;

[0038] Spheroidization and inoculation treatment: Pour 5 tons of molten iron after heating and carburization treatment into the ladle for spheroidization and inoculation treatment. The spheroidization reaction temperature is 1430°C. The amount of nodulizer added is determined according to the weight of the poured molten iron. The weight of nodulizer is 1.3% of the weight of molten iron, 65kg in total, 9.0% in weight of Mg, 5.85kg in total, 46.0% in weight of Si, 29.9kg in total, and the rest is iron. And according to the weight of the poured molten iron, weigh 75SiFe with 0.2% of the molten iron weight as a covering, 10kg in total, add the spheroidizing agent to the ...

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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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